WO2022149269A1 - Terminal, base station, and radio communication method - Google Patents

Abstract

This terminal includes a receiving unit for receiving a message via a physical downlink shared channel in a random-access channel procedure. The receiving unit carries out repeated reception of the message or receives the message using a second modulation scheme table defining a spectral efficiency that is lower than a spectral efficiency defined by a first modulation scheme table.

Description

Terminals, base stations and wireless communication methods

The present disclosure relates to terminals, base stations and wireless communication methods that execute wireless communication, in particular, terminals, base stations and wireless communication methods that execute message communication in a random access channel procedure.

The 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and next-generation specifications called Beyond 5G, 5G Evolution or 6G. We are also proceeding with the conversion.

In 3GPP Release 15 and Release 16 (NR), the operation of multiple frequency ranges, specifically, the band including FR1 (410MHz-7.125GHz) and FR2 (24.25GHz-52.6GHz) is specified. ..

In 3GPP Release 17, coverage enhancement is the subject of FR1 and FR2 (Non-Patent Document 1). Along with this, it is desirable to improve the channel quality such as PUSCH (Physical Uplink Shared Channel), PUSCH (Physical Uplink Shared Channel), PDCCH (Physical Downlink Control Channel), and PUCCH (Physical Uplink Control Channel).

"New SID on NR coverage enhancement", RP-193240, 3GPP TSG RAN Meeting # 86, 3GPP, December 2019

Against this background, the inventors do not support beam selection based on CSI-RS (Channel State Indicator-Reference Signal) for PDSCH used in the random access channel (RACH (Random Access Channel) procedure). We focused on the fact that only beam selection based on SSB (Synchronization Signal Block) is supported. As a result of diligent studies, the inventors have found a method for improving the channel quality of PDSCH.

Therefore, the following disclosure was made in view of such a situation, and the purpose is to provide a terminal that can improve the channel quality.

The present disclosure is a terminal comprising a receiving unit that receives a message via a physical downlink shared channel in a random access channel procedure, wherein the receiving unit repeatedly receives the message or first. The gist is to receive the message using a second modulation scheme table that defines a spectral efficiency that is lower than the spectral efficiency of the modulation scheme table.

The present disclosure is a base station comprising a transmitting unit that transmits a message via a physical downlink shared channel in a random access channel procedure, wherein the transmitting unit executes or repeatedly transmits the message. The gist is to transmit the message using a second modulation method table that defines a spectral efficiency lower than the spectral efficiency of the first modulation method table.

The present disclosure is a wireless communication method, comprising step A of receiving a message via a physical downlink shared channel in a random access channel procedure, wherein step A is a step of repeatedly receiving the message, or The gist is to include the step of receiving the message using the second modulation scheme table, which defines the spectral efficiency lower than the spectral efficiency of the first modulation scheme table.

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing a frequency range used in the wireless communication system 10. FIG. 3 is a diagram showing a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10. FIG. 4 is a functional block configuration diagram of the UE 200. FIG. 5 is a functional block configuration diagram of gNB100. FIG. 6 is a diagram for explaining the RACH procedure. FIG. 7 is a diagram for explaining the RACH procedure. FIG. 8 is a diagram for explaining the repeated transmission according to the modification example 1. FIG. 9 is a diagram for explaining the repeated transmission according to the second modification. FIG. 10 is a diagram for explaining the repeated transmission according to the modification example 3. FIG. 11 is a diagram for explaining the repeated transmission according to the modification example 3. FIG. 12 is a diagram for explaining the repeated transmission according to the modification example 4. FIG. 13 is a diagram for explaining the repeated transmission according to the modification example 4. FIG. 14 is a diagram showing an example of the hardware configuration of the UE 200.

Hereinafter, embodiments will be described based on the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

[Embodiment]
(1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the embodiment. The wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN20, and a terminal 200 (hereinafter, UE200)).

The wireless communication system 10 may be a wireless communication system according to a method called Beyond 5G, 5G Evolution or 6G.

NG-RAN20 includes a radio base station 100A (hereinafter, gNB100A) and a radio base station 100B (hereinafter, gNB100B). 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.

NG-RAN20 actually includes multiple NG-RANNodes, specifically gNB (or ng-eNB), and is connected to a core network (5GC, not shown) according to 5G. In addition, NG-RAN20 and 5GC may be simply expressed as "network".

GNB100A and gNB100B are radio base stations according to 5G, and execute wireless communication according to UE200 and 5G. gNB100A, gNB100B and UE200 are Massive MIMO (Multiple-Input Multiple-Output) and multiple component carriers (CC) that generate beam BM with higher directivity by controlling radio signals transmitted from multiple antenna elements. ) Can be bundled and used for carrier aggregation (CA), and dual connectivity (DC) that communicates with two or more transport blocks at the same time between the UE and each of the two NG-RAN Nodes.

In addition, the wireless communication system 10 supports a plurality of frequency ranges (FR). FIG. 2 shows the frequency range used in the wireless communication system 10.

As shown in FIG. 2, the wireless communication system 10 corresponds to FR1 and FR2. The frequency bands of each FR are as follows.

・ FR1: 410 MHz to 7.125 GHz
・ FR2: 24.25 GHz to 52.6 GHz
In FR1, Sub-Carrier Spacing (SCS) of 15, 30 or 60 kHz is used, and a bandwidth (BW) of 5 to 100 MHz may be used. FR2 has a higher frequency than FR1, and SCS of 60, or 120kHz (240kHz may be included) is used, and a bandwidth (BW) of 50 to 400MHz may be used.

SCS may be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to one subcarrier interval in the frequency domain.

Furthermore, the wireless communication system 10 also supports a higher frequency band than the FR2 frequency band. Specifically, the wireless communication system 10 corresponds to a frequency band exceeding 52.6 GHz and up to 114.25 GHz. Such a high frequency band may be referred to as "FR2x" for convenience.

To solve this problem, when using a band exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-) with a larger Sub-Carrier Spacing (SCS) S-OFDM) may be applied.

FIG. 3 shows a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10.

As shown in FIG. 3, one slot is composed of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the interval (frequency) shown in FIG. For example, 480 kHz, 960 kHz, etc. may be used.

Further, the number of symbols constituting one slot does not necessarily have to be 14 symbols (for example, 28, 56 symbols). In addition, the number of slots per subframe may vary from SCS to SCS.

The time direction (t) shown in FIG. 3 may be referred to as a time domain, a symbol period, a symbol time, or the like. Further, the frequency direction may be referred to as a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP: Bandwidth part), or the like.

DMRS is a kind of reference signal and is prepared for various channels. Here, unless otherwise specified, it may mean a downlink data channel, specifically, a DMRS for PDSCH (Physical Downlink Shared Channel). However, the upstream data channel, specifically, the DMRS for PUSCH (Physical Uplink Shared Channel) may be interpreted in the same manner as the DMRS for PDSCH.

DMRS can be used for channel estimation in UE200 as part of a device, eg, coherent demodulation. DMRS may only be present in the resource block (RB) used for PDSCH transmission.

DMRS may have multiple mapping types. Specifically, DMRS has mapping type A and mapping type B. In mapping type A, the first DMRS is placed in the second or third symbol of the slot. With mapping type A, DMRS may be mapped relative to the slot boundaries, regardless of where the actual data transmission begins in the slot. The reason why the first DMRS is placed in the second or third symbol of the slot may be interpreted as placing the first DMRS after the control resource sets (CORESET).

In mapping type B, the first DMRS may be placed in the first symbol of the data allocation. That is, the DMRS position may be given relative to where the data is located, rather than relative to the slot boundaries.

Also, DMRS may have multiple types. Specifically, DMRS has Type 1 and Type 2. Type 1 and Type 2 differ in the maximum number of mapping and orthogonal reference signals in the frequency domain. Type 1 can output up to 4 orthogonal signals with a single-symbol DMRS, and Type 2 can output up to 8 orthogonal signals with a double-symbol DMRS.

(2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described.

First, the functional block configuration of UE200 will be explained.

FIG. 4 is a functional block configuration diagram of UE200. As shown in FIG. 4, the UE 200 includes a radio signal transmission / reception unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, a coding / decoding unit 250, a data transmission / reception unit 260, and a control unit 270. ..

The radio signal transmission / reception unit 210 transmits / receives a radio signal according to NR. The wireless signal transmission / reception unit 210 corresponds to Massive MIMO, a CA that bundles a plurality of CCs, and a DC that simultaneously communicates between a UE and each of two NG-RAN Nodes.

The amplifier unit 220 is composed of PA (Power Amplifier) / LNA (Low Noise Amplifier) and the like. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. Further, the amplifier unit 220 amplifies the RF signal output from the radio signal transmission / reception unit 210.

The modulation / demodulation unit 230 executes data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB100 or other gNB). Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) may be applied to the modulation / demodulation unit 230. Further, the DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

The control signal / reference signal processing unit 240 executes processing related to various control signals transmitted / received by the UE 200 and processing related to various reference signals transmitted / received by the UE 200.

Specifically, the control signal / 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 layer (RRC). Further, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

The control signal / reference signal processing unit 240 executes processing using a reference signal (RS) such as Demodulation Reference Signal (DMRS) and Phase Tracking Reference Signal (PTRS).

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

In addition to DMRS and PTRS, the reference signal may include ChannelStateInformation-ReferenceSignal (CSI-RS), SoundingReferenceSignal (SRS), and PositioningReferenceSignal (PRS) for location information.

Further, the channel includes a control channel and a data channel. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel), Random Access Radio Network Temporary Identifier (RA-RNTI), Downlink Control Information (DCI), and Physical Broadcast Channel (PBCH) etc. are included.

The data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data means data transmitted over a data channel. The data channel may be read as a shared channel.

Here, the control signal / reference signal processing unit 240 constitutes a receiving unit that receives downlink control information (DCI). DCI has existing fields such as DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Allocation), TDRA (Time Domain Resource Allocation), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number). , NDI (NewDataIndicator), RV (RedundancyVersion), etc. are included.

The value stored in the DCI Format field is an information element that specifies the DCI format. The value stored in the CI field is an information element that specifies the CC to which DCI applies. The value stored in the BWP indicator field is an information element that specifies the BWP to which DCI applies. The BWP that can be specified by the BWP indicator is set by the information element (BandwidthPart-Config) included in the RRC message. The value stored in the FDRA field is an information element that specifies the frequency domain resource to which DCI applies. The frequency domain resource is specified by the value stored in the FDRA field and the information element (RAType) contained in the RRC message. The value stored in the TDRA field is an information element that specifies the time domain resource to which DCI applies. The time domain resource is specified by the value stored in the TDRA field and the information elements (pdsch-TimeDomainAllocationList, push-TimeDomainAllocationList) contained in the RRC message. Time domain resources may be identified by the values stored in the TDRA fields and the default table. The value stored in the MCS field is an information element that specifies the MCS to which DCI applies. MCS is specified by the values stored in MCS and the MCS table. The MCS table may be specified by RRC messages or specified by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ Process to which DCI is applied. The value stored in the NDI is an information element for specifying whether or not the data to which DCI is applied is the initial data. The value stored in the RV field is an information element that specifies the redundancy of the data to which DCI is applied.

For example, the control signal / reference signal processing unit 240 transmits a random access preamble as a first message (hereinafter, Msg1) in a random access procedure (hereinafter, RACH (RandomAccessChannel) procedure). The control signal / reference signal processing unit 240 receives a second message (hereinafter, Msg2) as a response message to Msg1 in the RACH procedure. After receiving Msg2, the control signal / reference signal processing unit 240 transmits a third message (hereinafter, Msg3) via PUSCH in the RACH procedure. The control signal / reference signal processing unit 240 receives the 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”).

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

In the embodiment, the control signal / reference signal processing unit 240 constitutes a receiving unit that receives a message via the PDSCH in the RACH procedure. The message received via PDSCH may be at least one of Msg2 and Msg4. The control signal / reference signal processing unit 240 repeatedly receives and receives messages via the PDSCH.

The coding / decoding unit 250 executes data division / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or other gNB).

Specifically, the coding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into predetermined sizes, and executes channel coding for the divided data. Further, the coding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230, and concatenates the decoded data.

The data transmission / reception unit 260 executes transmission / reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmitter / receiver 260 is a PDU / SDU in a plurality of layers (such as a medium access control layer (MAC), a radio link control layer (RLC), and a packet data convergence protocol layer (PDCP)). Assemble / disassemble the. Further, the data transmission / reception unit 260 executes data error correction and retransmission control based on the hybrid ARQ (Hybrid automatic repeat request).

The control unit 270 controls each functional block constituting the UE 200. For example, in the embodiment, the control unit 270 controls the RACH procedure described above.

Second, the functional block configuration of gNB100 will be explained.

FIG. 5 is a functional block configuration diagram of gNB100. As shown in FIG. 5, the gNB 100 has a receiving unit 110, a transmitting unit 120, and a control unit 130.

The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive the UL signal via PUCCH or PUSCH.

The transmission unit 120 transmits various signals to the UE 200. The transmission unit 120 may transmit a DL signal via PDCCH or PDSCH. In the embodiment, the transmission unit 120 constitutes a transmission unit that transmits a message via the PDSCH in the RACH procedure. The transmission unit 120 repeatedly transmits a message via the PDSCH.

The control unit 130 controls the gNB 100. In the embodiment, the control unit 130 constitutes a control unit that controls the transmission of the second control information based on the first control information and controls the communication of data based on the second control information.

(3) Repeated reception / transmission of message (PDSCH) The following describes the repeated reception / transmission of message (PDSCH). The message may be Msg2 or Msg4.

(3.1) Repeated reception / transmission of Msg2 As shown in FIG. 6, UE200 transmits Msg1 to NG RAN20 (for example, gNB100). UE200 receives DCI (PDCCH) which specifies the resource of Msg2 (PDSCH). The UE200 repeatedly receives Msg2 corresponding to Msg1 based on DCI. In other words, NG RAN20 performs repeated transmissions of Msg2 corresponding to Msg1 based on DCI. UE200 sends Msg3 corresponding to Msg2 to NG RAN 20. The UE200 receives DCI (PDCCH) that specifies the resources of Msg4 (PDSCH). UE200 receives Msg4 for Msg3 from NG RAN 20 based on DCI. UE200 sends an acknowledgment (HARQ-ACK) to Msg4 to NG RAN 20.

(3.2) Repeated reception / transmission of Msg4 As shown in FIG. 7, UE200 transmits Msg1 to NG RAN20 (for example, gNB100). UE200 receives DCI (PDCCH) which specifies the resource of Msg2 (PDSCH). UE200 receives Msg2 for Msg1 from NG RAN 20 based on DCI. UE200 sends Msg3 corresponding to Msg2 to NG RAN 20. The UE200 receives DCI (PDCCH) that specifies the resources of Msg4 (PDSCH). UE200 performs repeated reception of Msg4 corresponding to Msg3 based on DCI. In other words, NG RAN20 performs repeated transmissions of Msg4 corresponding to Msg3 based on DCI. Repeated reception / transmission of Msg4 is executed within the Contention resolution timer. UE200 sends an acknowledgment (HARQ-ACK) to Msg4 to NG RAN 20.

(3.3) Others In FIGS. 6 and 7, the repeated reception / transmission of Msg2 or Msg4 has been described. However, the embodiments are not limited to this. Repeated reception / transmission of both Msg2 and Msg4 may be executed. That is, at least one of Msg2 and Msg4 may be repeatedly received / transmitted.

Here, the repetitive reception / transmission may include a first type repetitive reception / transmission (inter-slot repetition) in which the PDSCH is monitored between slots. The first type may be referred to as Repetition type A. The repetitive reception / transmission may include a second type of repetitive reception / transmission (intra-slot repetition) in which the PDSCH is monitored in the slot. In intra-slot repetition, continuous PDSCHs across slots may be monitored. The second type may be referred to as Repetition type B. Details of Repetition type A and Repetition type B will be described later.

(4) Actions and Effects In an embodiment, the UE 200 performs repeated reception of PDSCH (Msg2 or Msg4). In other words, the gNB 100 performs repeated transmissions of PDSCH (Msg2 or Msg4). According to such a configuration, the coverage of PDSCH can be improved by improving the channel quality of PDSCH.

[Change example 1]
Hereinafter, modification 1 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described.

In change example 1, the following options can be considered as a method for NG RAN20 to determine whether or not UE200 supports repeated reception. In the following, a UE 200 that supports repeated reception may be referred to as an Enhanced UE. A UE 200 that does not support repeated reception may be referred to as a Legacy UE.

In option 1, the UE200 (control signal / reference signal processing unit 240) transmits a specific random access preamble corresponding to repeated reception as Msg1 in the RACH procedure. The specific random access preamble may be distinguished from other random access preambles by the index of the random access preamble (RA preamble index). The specific random access preamble may be distinguished from other random access preambles by the opportunity to transmit Msg1 (hereinafter referred to as RO (RACHOccasion)). The specific random access preamble may be distinguished from other random access preambles by the OCC (Orthogonal Coverage Code) pattern used in Msg1. The specific random access preamble may be distinguished from other random access preambles by two or more parameters selected from the Preamble index, RO and OCC. The specific random access preamble may be considered to be the preamble used by the Enhanced UE, and the other random access preambles may be considered to be the preamble used by the Legacy UE.

In change example 1, it may be considered that the notification of UE Capability is executed by the transmission of the specific random access preamble. The UE Capability may include an information element indicating whether or not the UE 200 supports repeated reception.

For example, when the specific random access preamble is distinguished by the RA preamble index, the broadcast information such as SIB may include the information shown below. Here, RACH-ConfigCommon information is exemplified as the notification information. RACH-ConfigCommon information may include totalNumberOfRA-PreamblesEnhancedUE used by EnhancedUE in addition to totalNumberOfRA-Preambles used by LegacyUE. Since gNB100 calculates RA (Random Access) -RNTI for Enhanced UE, UE200 can understand that it was recognized as Enhanced UE by gNB100 when DCI could be decoded using RA-RNTI. can.

Further, when the specific random access preamble is distinguished by RO, the notification information such as SIB may include the information shown below. Here, RACH-ConfigGeneric information is exemplified as the notification information. RACH-ConfigGeneric information may include msg1-FDM EnhancedUE used by Enhanced UE in addition to Msg1-FDM used by Legacy UE. In such a case, the RO of msg1-FDM Enhanced UE may be frequency-multiplexed in the peripheral resources of the RO of Msg1-FDM. For example, as shown in FIG. 8, four ROs for Enhanced UE represented by msg1-FDM Enhanced UE may be frequency-multiplexed with respect to four ROs for Legacy UE represented by Msg1-FDM.

In option 2, UE200 may send Msg3 to gNB100, which includes an information element indicating that repeated reception of Msg4 is possible. According to such a configuration, the gNB 100 may execute the repeated transmission of Msg4 after knowing that the UE 200 can support the repeated reception of Msg4.

[Change example 2]
Hereinafter, modification 2 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described.

In change example 2, the method of specifying the resource of the message (Msg2 or Msg4) will be described. As shown in FIG. 9, a PDCCH for Enhanced UE may be defined separately from the PDCCH for Legacy UE. In such a case, the gNB 100 may transmit the PDCCH for the Enhanced UE in addition to the PDCCH for the Legacy UE. In such cases, PDCCH resources may be specified with the options shown below.

In option 1, CORESET of PDCCH for Enhanced UE may be additionally assigned. The additional CORESET may be notified to the UE 200 by broadcast information such as SIB. In such a case, the Enhanced UE decodes the DCI (PDCCH) corresponding to the additional CORESET, but the Legacy UE does not have to decode the DCI (PDCCH) corresponding to the additional CORESET.

In option 2, resource candidates for Enhanced UE may be newly assigned. Candidates for resources for Enhanced UE may be notified to UE200 by notification information such as SIB. In such a case, gNB100 transmits the PDCCH for Legacy UE and the PDCCH for Enhanced UE in the RAR window (or Contention resolution timer).

In option 3, the PDCCH resource for Enhanced UE does not have to be notified to UE200. UE200 executes PDCCH decoding (Blind decode) by autonomously monitoring the resources of PDCCH for Enhanced UE.

Although not particularly limited, PDCCH resources are allocated according to the following formula described in §10.1 “UE procedure for determining physical downlink control channel assignment” of TS38.213 V16.3.0. It may be specified by selecting a PRB.

In such cases, SearchSpace information may include nrofCandidateswithEnhancedUE in addition to nrofCandidates. In such a case, the UE 200 can determine that the PDCCH whose PDCCH candidate ( _{ms, n_CI} ) is in the range of 0 to nrofCandidates-1 is the PDCCH for Legacy UE. On the other hand, the UE 200 can determine that the PDCCH whose PDCCH candidate ( _{ms, n_CI} ) is in the range of nrofCandidates-1 to nrofCandidateswithEnhancedUE-1 is the PDCCH for Enhanced UE.

[Change example 3]
Hereinafter, modification 3 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described. Modification 3 describes a type of repetitive reception / transmission.

Repetition type A described above is a procedure for receiving / transmitting PDSCH for each slot, as shown in FIG. As shown in FIG. 11, Repetition type B described above is a procedure for receiving / transmitting PDSCH in the slot. In Repetition type B, continuous PDSCH repeated reception / transmission may be executed across slots.

In such a case, PDSCH repeated transmission may be executed using non-continuous slots.

The slot in which repeated transmission is executed may be explicitly notified from NG RAN 20 to UE 200. For example, an information element indicating a slot in which repeated transmission is executed may be included in PDSCH-ConfigCommon information.

The slot in which repeated transmission is executed may be implicitly notified from NG RAN 20 to UE 200. For example, the slot in which repeated transmission is executed may be a slot excluding the U slot, or may be a slot excluding the U slot and the S slot (that is, the D slot). That is, the slot in which repeated transmission is executed may be implicitly notified by the TDD pattern.

The slot in which repeated transmission is executed may be notified to the UE 200 by both an explicit notification from the NG RAN 20 to the UE 200 and an implicit notification from the NG RAN 20 to the UE 200.

[Change example 4]
Hereinafter, modification 4 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described. Modification 4 describes frequency hopping of the message.

For example, as shown in FIG. 12, frequency hopping may be applied to Msg2. Similarly, as shown in FIG. 13, frequency hopping may be applied to Msg4.

Under such a background, in Repetition type A, frequency hopping (Inter-slot frequency hopping) in which PDSCH resources are hopping in the frequency direction may be applied to each slot. In Repetition type A, frequency hopping (Intra-slot frequency hopping) in which PDSCH resources are hopping in the slot in the frequency direction and the same hopping pattern is used between slots may be applied.

Similarly, in Repetition type B, frequency hopping (Inter-slot frequency hopping) in which PDSCH resources are hopping in the frequency direction may be applied to each slot. In Repetition type B, frequency hopping (Intra-slot frequency hopping) in which PDSCH resources are hopping in the slot in the frequency direction and the same hopping pattern is used between slots may be applied.

[Change example 5]
Hereinafter, modification 5 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described.

Modification 5 describes how to determine the parameters used for repeated reception / transmission. The parameter used for repeated reception / transmission may be one or more parameters selected from the number of repetitions, the type of repeated reception / transmission, and the frequency hopping method. The parameters may be defined by the options shown below.

In option 1, the parameters are predetermined in the wireless communication system 10. For example, the parameters may be determined according to the frequency band, SCS, division method (TDD or FDD), frequency range (FR1, FR2, etc.).

For example, in FR1, repeated reception / transmission may not be executed, and in FR2, repeated transmission may be executed and inter-slot hopping may be applied. In such a case, in FR2, the number of repetitions, the type of repeated reception / transmission, and the like may be determined by SCS and the like.

In option 2, the parameters are explicitly notified from NG RAN20. For example, broadcast information such as SIB may include an information element indicating a parameter. Information elements indicating parameters may be included in RACH-ConfigCommon information, PDSCH-ConfigCommon information, and the like.

For example, the pdsch-AggregationFactor may include an information element indicating the number of repetitions, and the pdsch-RepTypeIndicatorDCI-1-4 may include an information element indicating the type of repeated reception / transmission. In such a case, DCI Format may include a field that stores a flag indicating whether or not to repeatedly perform reception / transmission, and may include a field that stores a flag indicating whether or not frequency hopping is applied. good.

In option 3, the parameters are implicitly notified. For example, the parameter may be notified by the candidate position of the resource of PDCCH under the premise that the candidate position of DCI (PDCCH) specifying the resource of PDSCH and the parameter are associated with each other. On the premise that the RA preamble index and the parameter are associated with each other, the UE 200 may notify the parameter by the RA preamble index. Under the premise that the RO (RACH Occasion) of the random access preamble and the parameter are associated in advance, the UE 200 may notify the parameter to the NG RAN 20 by the RO. Under the premise that the OCC (Orthogonal Coverage Code) pattern of the random access preamble and the parameter are associated in advance, the UE 200 may notify the parameter to the NG RAN 20 by the OCC pattern. Under the premise that the Initial Bandwidth of the random access preamble and the parameter are associated in advance, the UE 200 may notify the parameter to the NG RAN 20 by the Initial Bandwidth. The parameters applied to Msg4 are associated with the TRP (Transmission Reception Point) of Msg2 (RAR) transmitted from gNB100, and may be implicitly notified by the TRP of Msg2 (RAR).

On the other hand, on the premise that the information elements (TDRA table index, MCS index, TA value) contained in Msg2 are associated with the parameters related to Msg4, gNB100 sets the parameters related to Msg4 to UE200 by the information elements contained in Msg2. May be notified to. The parameters for Msg4 may be the same as the parameters for Msg2.

[Change example 6]
Hereinafter, modification 6 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described.

In the embodiment, a case where PDSCH is repeatedly received / transmitted is illustrated. On the other hand, in the sixth modification, the PDSCH communication is executed using the second modulation method table that defines the spectral efficiency lower than the spectral efficiency of the first modulation method table. In the sixth modification, it is not necessary to repeatedly receive / transmit the PDSCH.

Specifically, the UE200 (control signal / reference signal processing unit 240) receives a message via the PDSCH using the second modulation method table that defines the spectral efficiency lower than the spectral efficiency of the first modulation method table. do. The gNB100 (transmitter 120) transmits a message via the PDSCH using a second modulation scheme table that defines a spectral efficiency that is lower than the spectral efficiency of the first modulation scheme table. The message may be any one of Msg2 and Msg4.

Here, the first modulation method table is a table that is already applicable to the message (Msg2 or Msg4). For example, the first modulation method table is the table defined in §5.1.3.1 "Modulation order and target code rate determination" of TS38.214 V16.3.0 (MCS index table 1 for PDSCH (Table 5.1.3.1-1), It may be MCS index table 2 for PDSCH (Table 5.1.3.1-2)). The second modulation method table is a table newly applicable to the message (Msg2 or Msg4). For example, the second modulation method table is the table defined in §5.1.3.1 "Modulation order and target code rate determination" of TS38.214 V16.3.0 (MCS index table 3 for PDSCH (Table 5.1.3.1-3)). May be. The second modulation method table may be referred to as a LowSE (Spectral Efficiency) MCS table, or may be referred to as a 64QAM LowSE MCS table.

Here, the modulation method table may be a table to which MCSIndex, ModulationOrder, TargetcodeRate and Spectral efficiency are associated. The modulation method table may be referred to as an MCS table. The Spectral efficiency defined in the second modulation scheme table is lower than the Spectral efficiency defined in the first modulation scheme table. The Target code Rate defined in the second modulation method table may be smaller than the Target code Rate defined in the first modulation method table.

In the following, a UE that uses the first modulation method table in the RACH procedure may be referred to as a Legacy UE, and a UE that uses the second modulation method table in the RACH procedure may be referred to as an Enhanced UE.

Under such a premise, the following options can be considered as a method of making the second modulation method table selectable in the RACH procedure.

In the first option, the broadcast information such as SIB may include an information element for selecting the second modulation method table. Taking PDSCH-ConfigCommon information as an example of broadcast information, mcs-TableENUMERATED {qam64LowSE} may be added as an information element that can be included in PDSCH-ConfigCommon information.

In the second option, whether or not to use the second modulation method table in the RACH procedure (hereinafter, whether or not the second modulation method table is applicable) is predetermined by the wireless communication system 10. For example, the applicability of the second modulation method table may be determined according to the frequency band, SCS, division method (TDD or FDD), and frequency range (FR1, FR2, etc.).

In the third option, the RNTI for Enhanced UE and the second modulation method table are associated. The UE 200 may demodulate the message (PDSCH) using the second modulation method table when the PDCCH decoding (Blind decoding) is successful using the RNTI for Enhanced UE. The RNTI for Enhanced UE may be included in the broadcast information such as SIB.

In the fourth option, the applicability of the second modulation method table may be explicitly notified from NG RAN20. For example, a higher layer message (eg, PDSCH-ConfigCommon information) may contain an information element that specifies the MCS table used in the RACH procedure. The DCI (eg, RA-RNTI, TC-RNTI, etc.) may be associated with the MCS table used in the RACH procedure.

In the fifth option, the applicability of the second modulation method table may be implicitly notified. The applicability of the second modulation method table depends on the DCI (PDCCH) candidate position, RA preamble index, RO (RACH Occasion), and OCC (Orthogonal Coverage Code) that specify PDSCH resources, as well as the parameters used for repeated reception / transmission. ) It may be associated with a pattern, Initial Bandwidth, or the like. The MCS table used in the RACH procedure may be implicitly notified by the candidate position of PDCCH, RA preamble index, RO, OCC pattern, and Initial Bandwidth. The MCS table applied to Msg4 is associated with the TRP of Msg2 (RAR) and may be implicitly notified by the TRP of Msg2 (RAR).

In the modification example 6, 64QAMLowSEMCStable is exemplified as the second modulation method table. However, modification 6 is not limited to this. A new MCS table may be introduced as the second modulation method table. The new MCS table may be an MCS table in which a low Spectral efficiency is defined by a modulation scheme such as Pi / 2 BPSK. In such a case, the UE 200 may send a UE Capability to the NG RAN 20 including an information element indicating whether or not the new MCS table is supported.

[Change example 7]
Hereinafter, modification 7 of the embodiment will be described. In the following, the differences from the modified example 6 will be mainly described.

In change example 7, it is assumed that the Spectral efficiency is lowered by applying the above-mentioned second modulation method table. Specifically, DCI (for example, DCI Format 1_0 transmitted using TC-RNTI) that specifies the resource of Msg4 (PDSCH) is an element that scales TB (Transport Block) of Msg4 (hereinafter, TB scaling factor). ) Is included (hereinafter, TB scaling field). The TB scaling factor may be associated with the MCS table used in the RACH procedure, or may be associated with the TC-RNTI.

As the TB scaling factor, an existing value (for example, 1, 0.5, 0.25) may be used, or a new value (for example, 0.125) may be introduced. The new value may be associated with a value not used in the existing TB scaling field (eg, 11).

UE200 notifies gNB100 whether the TB scaling factor can be applied to Msg4. The notification method is not particularly limited, but may be explicitly notified by Msg3, or implicitly by PDCCH candidate position, RA preamble index, RO, OCC pattern, and Initial Bandwidth. When the TB scaling factor is notified by DCI, the UE200 executes the TBS determination of Msg4 based on the TB scaling factor.

In the change example 7, the case where the TB scaling factor is applied to Msg4 is illustrated, but the change example 7 is not limited to this. The TB scaling factor may be applied to Msg2.

[Change example 8]
Hereinafter, modification 8 of the embodiment will be described. In the following, the differences between the modified example 6 and the modified example 7 will be mainly described.

In the change example 7, it is assumed that the Spectral efficiency is reduced by applying the above-mentioned second modulation method table, and the TB size is reduced by the introduction of the above-mentioned TB scaling factor. Specifically, the payload of the message transmitted via the PDSCH in the RACH procedure is divided into two or more slots and transmitted (hereinafter, divided transmission). The message is at least one of Msg2 and Msg4. As a method of divided transmission, the following options can be considered.

In option 1, the resources of two or more PDSCHs that span two or more slots for sending messages are specified by two or more DCIs (PDCCHs) that individually correspond to the two or more PDSCHs. In such a case, it is necessary to notify the UE 200 whether or not the message division transmission is executed.

The UE200 may be explicitly notified whether or not the divided message transmission is executed. For example, the broadcast information such as SIB (for example, PDSCH-ConfigCommoninformation) may include an information element indicating whether or not the divided transmission of the message is executed. Whether or not the divided transmission of Msg4 is executed may be explicitly notified by the information element contained in Msg2 (RAR).

The UE200 may be implicitly notified whether or not the divided message transmission is executed. For example, whether or not the message division transmission is executed is associated with one or more elements selected from the PDCCH candidate position, RA preamble index, RO, OCC pattern, and Initial Bandwidth. May be implicitly notified by an element. Whether or not the split transmission of Msg4 is executed is associated with one or more elements selected from the TRP and MCS tables of Msg2 (RAR), and is implicitly notified by these elements. May be good.

In option 2, the resource of one PDSCH straddling two or more slots for sending a message is specified by one DCI (PDCCH). In such a case, it is necessary to allocate 15 or more OFDM symbols, which is more than one slot (14 OFDM symbols), as a resource of one PDSCH. Therefore, a new SLIV table that can specify SLIV (Start and Length Indicator Value) corresponding to such PDSCH resources is required. The DCI may include an information element (eg, mapping type (type C)) that specifies a new SLIV table. UE200 identifies 15 or more OFDM symbols from the new SLIV table when mapping type (type C) is specified. For example, mapping typeENUMERATED {typeA, typeB, typeC} may be defined as a possible value of PDSCH-TimeDomainResourceAllocation included in PDSCH-TimeDomainResourceAllocationList.

[Other embodiments]
Although the contents of the present invention have been described above according to the embodiments, it is obvious to those skilled in the art that the present invention is not limited to these descriptions and can be modified and improved in various ways.

In the above disclosure, the 4-step RACH procedure including the 4-step procedure was illustrated as the RACH procedure. However, the above disclosure is not limited to this. The RACH procedure may be a 2-step RACH procedure that includes a two-step procedure. In such a case, the message transmitted from the UE 200 to the gNB 100 may be referred to as MsgA, and the message transmitted from the gNB 100 to the UE 200 may be referred to as MsgB. In such a case, the message (PDSCH) to be repeatedly transmitted may be MsgB.

The block configuration diagram (FIG. 4) used in the description of the above-described embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). In each case, as described above, the realization method is not particularly limited.

Further, the above-mentioned gNB100 and UE200 (the device) may function as a computer for processing the wireless communication method of the present disclosure. FIG. 14 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 14, 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.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.

Each functional block of the device (see FIG. 4) is realized by any hardware element of the computer device or a combination of the hardware elements.

In addition, each function in the device is such that the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory. It is realized by controlling at least one of reading and writing of data in 1002 and storage 1003.

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

Further, the processor 1001 reads a program (program code), a 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-described embodiment is used. Further, the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. Storage 1003 may be referred to as auxiliary storage. The recording medium described above may be, for example, a database, server or other suitable medium containing at least one of the memory 1002 and the storage 1003.

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 referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.

The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

In addition, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. Bus 1007 may be configured using a single bus or may be configured using different buses for each device.

Further, the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA). The hardware may implement some or all of each functional block. For example, processor 1001 may be implemented using at least one of these hardware.

Further, the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (eg Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (eg RRC signaling, Medium Access Control (MAC) signaling, Master Information Block). (MIB), System Information Block (SIB)), other signals or combinations thereof. RRC signaling may also be referred to as an RRC message, eg, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.

Each aspect / embodiment described in the present disclosure includes LongTermEvolution (LTE), LTE-Advanced (LTE-A), SUPER3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system ( 5G), FutureRadioAccess (FRA), NewRadio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UltraMobileBroadband (UMB), IEEE802.11 (Wi-Fi (registered trademark)) , IEEE802.16 (WiMAX®), IEEE802.20, Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next-generation systems extended based on them. It may be applied to one. In addition, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

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

In some cases, the specific operation performed by the base station in this disclosure may be performed by its upper node (upper node). In a network consisting of one or more network nodes having a base station, various operations performed for communication with the terminal are the base station and other network nodes other than the base station (eg, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.). Although the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and signals (information, etc.) can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input / output information may be overwritten, updated, or added. The output information may be deleted. The entered information may be transmitted to other devices.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, the software may use at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.) to create a website. When transmitted from a server or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

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

The terms described in the present disclosure and the terms necessary for understanding the present 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, the signal may be a message. Further, the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

Further, the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed in this disclosure. Since various channels (eg, 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 in any respect limited names. is not.

In this disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "cell group", " Terms such as "carrier" and "component carrier" may be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a remote radio for indoor use). Communication services can also be provided by Head: RRH).

The term "cell" or "sector" refers to a part or all of the coverage area of at least one of the base station providing communication services in this coverage and the base station subsystem.

In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, a mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read as a mobile station (user terminal, the same shall apply hereinafter). For example, communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the mobile station may have the functions of the base station. Further, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions of the mobile station.

The wireless frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe.

The subframe may be further composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval: TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.

The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time region. Slots may be unit of time based on numerology.

The slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot. PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.

The wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may use different names corresponding to each.

For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as TTI, and one slot or one minislot may be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. May be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in an LTE system, a base station schedules each user terminal to allocate wireless resources (frequency bandwidth that can be used in each user terminal, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (Physical RB: PRB), a sub-carrier group (Sub-Carrier Group: SCG), a resource element group (Resource Element Group: REG), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks for a neurology in a carrier. good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples. For example, the number of subframes contained in a radio frame, the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB. The number of subcarriers, as well as the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-comprehensive examples, the radio frequency region. , Electromagnetic energies with wavelengths in the microwave and light (both visible and invisible) regions, etc., can be considered to be "connected" or "coupled" to each other.

The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applied standard.

The statement "based on" used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

The "means" in the configuration of each of the above devices may be replaced with a "part", a "circuit", a "device", or the like.

Any reference to elements using designations such as "first" and "second" as used in this 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 adopted there, or that the first element must somehow precede the second element.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as inclusive as the term "comprising". Is intended. Moreover, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). It may include (eg, searching in a table, database or another data structure), ascertaining as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. It may include (for example, accessing data in memory) to be regarded as "judgment" or "decision". In addition, "judgment" and "decision" are considered to be "judgment" and "decision" when the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

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

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 in the present disclosure. The present disclosure may be implemented as amendments and modifications without departing from the spirit and scope of the present disclosure as determined by the description of the scope of claims. Therefore, the description of this disclosure is for purposes of illustration and does not have any limiting meaning to this disclosure.

10 Wireless communication system 20 NG-RAN
100 gNB
110 Receiver 120 Transmitter 130 Control 200 UE
210 Wireless signal transmitter / receiver 220 Amplifier 230 Modulator / demodulator 240 Control signal / reference signal processing 250 Encoding / decoding 260 Data transmitter / receiver 270 Control 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims (5)

In a random access channel procedure, a receiver that receives messages over a physical downlink shared channel is provided.
The receiver is
Repeatedly receive the message, or
A terminal that receives the message using a second modulation scheme table that defines a spectral efficiency that is lower than the spectral efficiency of the first modulation scheme table. The terminal according to claim 1, further comprising a transmission unit that transmits a specific random access preamble corresponding to repeated reception of the message as a message in the random access channel procedure. As the repeated reception of the control information, the receiving unit receives the first type of repeated reception of monitoring the physical downlink control channel between slots and the second type of repeated reception of monitoring the physical downlink control channel in the slot. The terminal according to claim 1 or 2, wherein at least one of the above is executed. In a random access channel procedure, a transmitter that sends a message over a physical downlink shared channel is provided.
The transmitter is
Repeatedly send the message, or
A base station that transmits the message using a second modulation scheme table that defines a spectral efficiency that is lower than the spectral efficiency of the first modulation scheme table. The random access channel procedure comprises step A of receiving a message over a physical downlink shared channel.
The step A is
A step of repeatedly receiving the message, or
A wireless communication method comprising the step of receiving the message using a second modulation scheme table that defines a spectral efficiency that is lower than the spectral efficiency of the first modulation scheme table.

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