WO2022107256A1

WO2022107256A1 - User equipment

Info

Publication number: WO2022107256A1
Application number: PCT/JP2020/043057
Authority: WO
Inventors: 春陽越後; 大輔栗田; 浩樹原田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2022-05-27
Also published as: JPWO2022107256A1

Abstract

This user equipment comprises: a transmission unit that, during a random access channel procedure, transmits a first specific message if a prescribed condition is not met, said first specific message not including a random access preamble; and a reception unit that, during the random access channel procedure, receives a second specific message as a response message to the first specific message, said second specific message not including a timing advance command.

Description

Terminal

The present disclosure relates to a terminal that performs wireless communication, in particular a terminal that transmits a message via a physical uplink shared channel in a random access channel procedure.

The 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also known as 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, a random access channel (RACH (RandomAccessChannel) procedure) is defined as a procedure for a terminal (UE (User Equipment)) to connect to a network. The RACH procedure includes a four-step procedure 4 -A step RACH procedure and a 2-step RACH procedure including a two-step procedure are specified (for example, Non-Patent Document 1).

Against this background, the inventors have focused on ultra-low latency communication that will be required in the future, and as a result of diligent studies, have found a method for reducing the overhead and lower latency of the RACH procedure.

Therefore, the following disclosure was made in view of such a situation, and aims to provide a terminal capable of reducing the overhead and the delay of the random access procedure.

The present disclosure comprises a transmission unit that is a terminal and transmits a first specific message not including a random access preamble when a predetermined condition is satisfied in the random access channel procedure, and the first in the random access channel procedure. The gist is that the response message to the specific message includes a receiving unit that receives the second specific message that does not include the timing advance command.

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 diagram for explaining the RACH procedure of type 1. FIG. 6 is a diagram for explaining the RACH procedure of type 2. FIG. 7 is a diagram for explaining the RACH procedure of type 3. FIG. 8 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.

The NG-RAN20 actually contains 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. The 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) for simultaneously communicating with two or more transport blocks 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 120 kHz (240 kHz may be included) is used, and a bandwidth (BW) of 50 to 400 MHz 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. In 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 mappings 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. Specifically, the functional block configuration of UE200 will be described.

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

In the embodiment, the radio signal transmission / reception unit 210 executes a random access procedure (hereinafter, RACH (RandomAccessChannel) procedure). As the RACH procedure, a 4-step RACH procedure and a 2-step RACH procedure are known, but in the embodiment, the radio signal transmission / reception unit 210 can execute the RACH procedure shown below. The 4-step RACH procedure may be referred to as type 1, and the 2-step RACH procedure may be referred to as type 2. The RACH procedure shown below may be referred to as type 3.

Specifically, the radio signal transmission / reception unit 210 constitutes a transmission unit that transmits a first specific message that does not include a random access preamble (hereinafter referred to as RACH preamble) when a predetermined condition is satisfied in the RACH procedure. In the RACH procedure, the radio signal transmission / reception unit 210 receives a second specific message that does not include a timing advance command (hereinafter, simply TA (Timing Advance)) as a response message to the first specific message in the RACH procedure. Configure. TA is a command used by the UE 200 to adjust the transmission timing of the uplink signal. Here, the first specific message may be referred to as message X (hereinafter, MsgX), and the second specific message may be referred to as message Y (hereinafter, MsgY).

The predetermined conditions are the condition that the reception quality of the signal notified from the network (for example, NG RAN20) is better than the specific quality and the condition that the number of transmissions of the first specific message (MsgX) does not exceed the maximum number of transmission attempts. Includes at least one. The signal notified from the NG RAN 20 may include an SS / PBCH (Synchronization Signals / Physical Broadcast Channel) block. The reception quality may include RSRP (Reference Signal Received Power).

The radio signal transmission / reception unit 210 may receive system information from the network including an information element indicating at least one of a specific threshold value and a maximum number of transmissions.

The information element indicating the specific quality is an information element indicating a threshold value for determining whether or not to apply the RACH procedure of type 3. The information element indicating the specific quality may be the same information element as the information element indicating the threshold value for determining whether or not to apply the RACH procedure of type 2 (for example, msgA-RSRP-Threshold). The information element indicating the specific quality may be an information element different from the information element indicating the threshold value for determining whether or not to apply the RACH procedure of type 2. The specific quality may be smaller than the threshold for determining whether to apply the type 2 RACH procedure. The information element indicating a specific quality may be referred to as msgX-RSRP-Threshold.

The information element indicating the maximum number of transmission attempts is an information element indicating the maximum number of times that MsgX can be retransmitted in the type 3 RACH procedure. The information element indicating the maximum number of transmission attempts may be the same as the information element indicating the maximum number of times MsgA can be retransmitted in the type 2 RACH procedure (for example, msgA-transMax). The information element indicating the maximum number of transmission attempts may be different from the information element indicating the maximum number of times MsgA can be retransmitted in the type 2 RACH procedure (for example, msgA-transMax). The information element indicating the maximum number of transmission attempts may be referred to as msgX-TransMax.

The wireless signal transmission / reception unit 210 sets at least the reference signal used for demodulating the first specific message (MsgX), the resource setting of the transmission opportunity of the first specific message (MsgX), and the reception window length of the second specific message (MsgY). System information including an information element indicating any one may be received from the network.

The information element indicating the setting of the reference signal used for demodulation of MsgX may be the same value as the information element (msgA-DMRS-Config) indicating the setting of the reference signal used for demodulation of MsgA in the RACH procedure of type 2. The information element indicating the setting of the reference signal used for demodulation of MsgX may be different from the information element (msgA-DMRS-Config) indicating the setting of the reference signal used for demodulation of MsgA in the RACH procedure of type 2. .. The reference signal setting used for demodulation of MsgX may be referred to as msgX-DMRS-Config. In such a case, at least a part of the reference signal setting used for demodulation of MsgX may overlap with the setting of the reference signal used for demodulation of MsgA. In other words, at least part of the reference signal settings used for MsgA demodulation may be shared with the reference signal settings used for MsgX demodulation.

The information element indicating the resource setting of the transmission opportunity of MsgX may be the same information element as the resource setting (MsgA-PUSCH-Resource config) of the transmission opportunity (PUSCH Occasion) of MsgA in the RACH procedure of type 2. The information element indicating the resource setting of the transmission opportunity of MsgX may be different from the resource setting (MsgA-PUSCH-Resource config) of the transmission opportunity (PUSCH Occasion) of MsgA in the RACH procedure of type 2. The information element indicating the resource setting of the transmission opportunity of MsgX may be referred to as MsgX-PUSCH-Resource config. In such cases, at least part of the MsgX transmission opportunity resource settings may overlap with the MsgA transmission opportunity resource settings. In other words, at least a portion of MsgA's transmission opportunity resource settings may be shared with MsgX's transmission opportunity resource settings.

The reception window length of MsgY may be the same value as the reception window of MsgB (for example, msgB-ResponseWindow) in the RACH procedure of type 2. The reception window length of MsgY may be a value different from the reception window of MsgB (for example, msgB-ResponseWindow) in the RACH procedure of type 2. The reception window length of MsgY may be referred to as msgY-ResponseWindow.

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) contained 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 specified by the values stored in the TDRA field and the default table. The value stored in the MCS field is an information element that specifies the MCS to which DCI is applied. 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.

In embodiments, DCI includes Time Domain Resource Allocation (TDRA) for Uplink Channel (PUSCH). The DCI including the TDRA of PUSCH may be a DCI of Format 0_0, Format 0_1 or Format 0_2.

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.

(3) Operation example The operation example will be described below. Here, as the RACH procedure, a type 1 RACH procedure (4-step RACH procedure), a type 2 RACH procedure (2-step RACH procedure), and a type 3 RACH procedure will be described. The type 3 RACH procedure is a newly defined RACH procedure.

(3.1) RACH procedure of type 1 As shown in FIG. 5, in step S10, the UE 200 receives a signal notified from the NG RAN 20. The signal notified from the NG RAN 20 may include an SS / PBCH block. The signal notified from the NG RAN 20 may include system information. The system information may include settings related to RACH procedures (eg, RACH-Config). RACH-Config may be included in SIB (System Information Block). RACH-Config may be an RRC information element (TS38.331 V16.1.0 (see §6.3.2 “Radio resource control Information elements”).

In step S11, UE200 sends a first message (Msg1) including RACH preamble to NG RAN20. The UE200 may repeat the transmission of Msg1 while increasing the transmission power of Msg1 (powerRamping).

In step S12, UE200 receives a second message (Msg2) from NG RAN20 as a response message to Msg1. Msg2 includes RAR (RandomAccessResponse) and TA.

In step S13, UE200 sends a third message (Msg3) to NG RAN20 via PUSCH. Msg3 contains a UE ID that identifies the UE 200. The UEID contained in Msg3 is used for Msg3 conflict resolution. The UE ID may include C-RNTI (Cell-Radio Network Temporary Identifier).

In step S14, UE200 receives a fourth message (Msg4) from NG RAN20 as a response message to Msg3. Msg4 includes a UE ID (hereinafter, Contention resolution ID) that identifies the UE 200. The Contention resolution ID may be the same as the UE ID included in Msg3.

Note that the UE200 may determine whether or not Msg4 can be received based on the Contention resolution ID, and if Msg4 cannot be received, execute the retransmission control of Msg3.

In step S15, the UE 200 transmits a response signal (HARQ-ACK) indicating whether or not Msg4 has been received to the NG RAN 20.

As the procedure from step S11 to step S14, the procedure specified in 3GPP TS38.321 V16.2.1 §5.1 “Random Access procedure” may be used.

(3.2) RACH procedure of type 2 As shown in FIG. 6, in step S20, the UE 200 receives a signal notified from the NG RAN 20. The signal notified from the NG RAN 20 may include an SS / PBCH block. The signal notified from the NG RAN 20 may include system information. The system information may include settings related to RACH procedures (eg, RACH-Config). RACH-Config may be included in SIB (System Information Block). RACH-Config may be an RRC information element (TS38.331 V16.1.0 (see §6.3.2 “Radio resource control Information elements”).

In step S21, UE200 sends MsgA including RACH preamble to NG RAN20. The UE200 may repeat the transmission of MsgA while increasing the transmission power of Msg1 (power ramping). MsgA also has the functions of Msg1 and Msg3 described above. Therefore, MsgA includes the UEID used for conflict resolution in addition to the RACH preamble.

In step S22, UE200 receives MsgB as a response message to MsgA. MsgB also has the functions of Msg2 and Msg4 described above. Therefore, MsgB includes RAR, TA and Contention resolution ID.

Note that the UE200 may determine whether or not MsgB can be received based on the Contention resolution ID, and if MsgB cannot be received, execute MsgA retransmission control.

In step S23, the UE 200 transmits a response signal (HARQ-ACK) indicating whether or not MsgB has been received to the NG RAN 20.

As the procedure from step S21 to step S22, the procedure specified in 3GPP TS38.321 V16.2.1 §5.1 “Random Access procedure” may be used.

(3.3) RACH procedure of type 3 As shown in FIG. 7, in step S30, the UE 200 receives a signal notified from the NG RAN 20. The signal notified from the NG RAN 20 may include an SS / PBCH block. The signal notified from the NG RAN 20 may include system information. The system information may include settings related to RACH procedures (eg, RACH-Config). RACH-Config may be included in SIB (System Information Block). RACH-Config may be an RRC information element (TS38.331 V16.1.0 (see §6.3.2 “Radio resource control Information elements”).

The RACH-Config may include an information element (for example, msgX-RSRP-Threshold) indicating a specific quality to be compared with the reception quality of the signal notified from the NG RAN 20. RACH-Config may include an information element (eg, msgX-TransMax) indicating the maximum number of MsgX retransmission attempts. RACH-Config may include an information element indicating the setting of the reference signal used for demodulation of MsgX. RACH-Config may include an information element (eg, msgX-DMRS-Config) indicating the setting of the reference signal used for demodulation of MsgX. RACH-Config may include an information element (for example, MsgX-PUSCH-Resource config) indicating the resource setting of the transmission opportunity of MsgX. RACH-Config may include an information element indicating the reception window length (msgY-ResponseWindow) of MsgY.

In step S31, the UE 200 sends MsgX without the RACH preamble to the NG RAN 20 when the predetermined conditions are met. MsgX also has the functions of Msg1 and Msg3 described above. Therefore, MsgX includes a UE ID used for conflict resolution. However, it should be noted that MsgX, unlike MsgA, does not contain RACH preambles.

Note that the predetermined condition may include a condition in which the reception quality of the signal (for example, SS / PBCH block) notified from the NG RAN 20 is better than the specific quality. The predetermined condition may include a condition in which the number of transmissions of MsgX does not exceed the maximum number of transmission attempts.

In step S32, UE200 receives MsgY as a response message to MsgX. MsgY also has the functions of Msg2 and Msg4 described above. Therefore, MsgY includes TA, RAR and Contention resolution ID. At this time, since MsgX does not include the RACH preamble, NGRAN20 cannot consider the time difference due to the delay when receiving the PUSCH of MsgX. However, NGRAN20 can notify TA instructions with MsgY by referring to PUSCHDMRS of MsgX.

Note that the UE200 may determine whether or not MsgY can be received based on the Contention resolution ID, and if MsgY cannot be received, execute MsgX retransmission control.

In step S33, the UE 200 transmits a response signal (HARQ-ACK) indicating whether or not MsgY has been received to the NG RAN 20.

(4) Actions and Effects In an embodiment, the UE 200 transmits MsgX without RACH preamble and receives MsgY without TA in the RACH procedure. In other words, a new RACH procedure using MsgX without RACH preamble and MsgY without TA (eg, type 3 RACH procedure) is introduced. According to such a configuration, the overhead can be reduced and the delay can be reduced by the new RACH procedure. In particular, paying attention to the fact that the TA applied to the UE 200 is small in a small cell using a high frequency, it is effective to apply the type 3 RACH procedure in such a case.

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

Modification 1 describes a method of applying the maximum number of retransmission attempts of MsgX described above. Here, a case where the UE 200 can execute the RACH procedure of type 1, type 2, and type 3 as the RACH procedure will be described.

First, a case where a new information element (for example, msgX-TransMax) is introduced as an information element indicating the maximum number of retransmission attempts of MsgX will be described. In such a case, the information element (for example, msgA-TransMax) indicating the maximum number of retransmission attempts of type 2 MsgA is defined separately from msgX-TransMax.

For example, if the RACH procedure is executed in the order of type 3, type 2, and type 1, the RACH procedure of type 3 will not succeed even if the number of MsgX transmissions reaches the maximum number of retransmission attempts specified by msgX-TransMax. In this case, the UE200 ends the type 3 RACH procedure and starts the type 2 RACH procedure. If the RACH procedure of type 2 does not succeed even if the number of transmissions of MsgA reaches the maximum number of retransmission attempts specified by msgA-TransMax, the UE200 terminates the RACH procedure of type 2 and RACH of type 1. Start the procedure.

Alternatively, if the RACH procedure is executed in the order of type 3 and type 1, the RACH procedure of type 3 does not succeed even if the number of transmissions of MsgX reaches the maximum number of retransmission attempts specified by msgX-TransMax. UE200 ends the type 3 RACH procedure and starts the type 1 RACH procedure. In such a case, as a method of skipping the RACH procedure of type 2, a method of setting a value larger than the maximum number of retransmission attempts of MsgA as the maximum number of retransmission attempts of MsgX may be used, and the RACH procedure of type 2 may be used. It may be a method of notifying in advance an information element indicating that the above is skipped.

Second, a case where an existing information element (for example, msgA-TransMax) is diverted as an information element indicating the maximum number of retransmission attempts of MsgX will be described. In such a case, msgA-TransMax may include an information element indicating the maximum number of retransmission attempts of MsgX in addition to the information element indicating the maximum number of retransmission attempts of MsgA. Alternatively, msgA-TransMax may include an information element indicating the maximum number of retransmission attempts of MsgA without including an information element indicating the maximum number of retransmission attempts of MsgX. In such a case, the maximum number of retransmission attempts of MsgX may be treated as the same as the maximum number of retransmission attempts of MsgA.

For example, if the RACH procedure is executed in the order of type 3, type 2, and type 1, the RACH procedure of type 3 will not succeed even if the maximum number of retransmission attempts specified by msgA-TransMax is reached. In this case, the UE200 ends the type 3 RACH procedure and starts the type 2 RACH procedure. If the RACH procedure of type 2 does not succeed even if the number of transmissions of MsgA reaches the maximum number of retransmission attempts specified by msgA-TransMax, the UE200 terminates the RACH procedure of type 2 and RACH of type 1. Start the procedure.

Alternatively, if the RACH procedure is executed in the order of type 3 and type 1, the RACH procedure of type 3 does not succeed even if the number of transmissions of MsgX reaches the maximum number of retransmission attempts specified by msgA-TransMax. UE200 ends the type 3 RACH procedure and starts the type 1 RACH procedure. In such a case, the method of skipping the type 2 RACH procedure may be a method in which the information element indicating the maximum number of MsgA retransmission attempts is not included in msgA-TransMax, and the type 2 RACH procedure is skipped. It may be a method of notifying in advance an information element indicating that effect.

In such cases, the UE 200 may receive system information from the network that includes information elements that specify the trial order of three or more types of RACH procedures. Information elements that specify the trial order of RACH procedures may be included in the SS / PBCH block described above. Information elements that specify the trial order of RACH procedures may be included in the RACH-Config described above.

For example, in the above case, the information element that specifies the trial order of the RACH procedure may be an information element (flag information) indicating that the RACH procedure of type 2 is skipped. The information element that specifies the trial order of the RACH procedure may be considered to be an information element (for example, msgX-TransMax) that indicates the maximum number of retransmission attempts of MsgX for which a value larger than the maximum number of retransmission attempts of MsgA is set. .. The information element that specifies the trial order of the RACH procedure may be considered to be msgA-TransMax that does not include the information element indicating the maximum number of retransmission attempts of MsgA in order to skip the type 2 RACH procedure.

[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 the second modification, the details of the above-mentioned MsgX will be described.

First, the UE ID for conflict resolution included in MsgX will be explained.

If the UE200 stores the C-RNTI, the UE200 may include the C-RNTI in MsgX as a UEID for conflict resolution. When the UE200 does not store the C-RNTI, CCCH (Common Control Channel) SDU (Service Data Unit) may be included in MsgX as a UE ID for conflict resolution. The CCCH SDU may contain information that can identify the UE 200.

Second, I will explain the transmission power of MsgX.

Like Msg1 and MsgA, UE200 may repeat the transmission of MsgX while increasing the transmission power of MsgX (power ramping). In such a case, the UE 200 may receive an information element indicating the power ramping setting from the NG RAN 20.

Alternatively, unlike Msg1 and MsgA, UE200 may repeat the transmission of MsgX without changing the transmission power of MsgX. In such a case, the UE200 does not have to receive the information element indicating the power ramping setting from the NG RAN 20.

[Change example 3]
Hereinafter, modification 3 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described. In the third modification, the resource setting of the transmission opportunity of MsgX described above will be described.

First, a case where a new PUSCH occurrence is defined as a PUSCH occupation used for transmission of MsgX (RACH procedure of type 3) will be described. In such a case, the UE200 receives an information element that specifies the PUSCH occurrence and DMRS port used in the RACH procedure of type 3 from the NG RAN 20 for each SS / PBCH block. Such an information element may include an information element indicating the number of PUSCH occurrences and DMRS ports. In such a case, the NG RAN20 is the PUSCH occurrence used in the type 3 RACH procedure in the order of frequency, DMRS port and time in the PUSCH resource associated with the SS / PBCH block index (eg, SSBIndex). May be assigned.

Second, we will explain the case where the existing PUSCH occurrence is used as the PUSCH occurrence used for MsgX transmission (type 3 RACH procedure). The existing PUSCH occurrence may be the PUSCH occurrence used for transmitting MsgA. In such cases, the UE 200 may use the frequency and time resources specified by the MsgA-PUSCH-Resource config as the PUSCH occurrence used in the type 3 RACH procedure.

[Change example 4]
Hereinafter, modification 4 of the embodiment will be described. In the following, the differences from the embodiments will be mainly described. In the fourth modification, the above-mentioned decoding of MsgY will be described.

As mentioned above, UE200 receives MsgY as a response message of MsgX. If the UE200 stores the C-RNTI, the UE200 may decode the PDCCH (MsgY) based on the C-RNTI. If the UE200 does not remember the C-RNTI, the UE200 may decode the PDCCH (MsgY) based on the RNTI corresponding to the PUSCH time and frequency resources. The RNTI corresponding to the MsgX PUSCH resource may be referred to as the MsgY-RNTI.

If NGRAN20 succeeds in receiving MsgX, it sends MsgY including at least ContentionresolutionID to UE200. MsgY may include information related to TPC (Transmission Power Command), C-RNTI and PUCCH. NG RAN20 does not send MsgY to UE200 if it fails to receive MsgX. The UE200 determines that the transmission of MsgX has failed when MsgY is not transmitted from NGRAN20 and MsgY cannot be received from NGRAN20.

Here, the RNTI (MsgY-RNTI) corresponding to the MsgX PUSCH resource may be calculated as shown below based on the MsgX PUSCH resource.

MsgY-RNTI = 1 + (first OFDM symbol index) + 14 × (first slot index) + 14 × 80 × (first frequency resource index) + 14 × 80 × 8 × (UL = 0 or SUL = 1) + 14 × 80 × 8 × 2

[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.

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 UE200 (the device) may function as a computer that processes the wireless communication method of the present disclosure. FIG. 8 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 8, 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.

Furthermore, 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 notification, 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, twist 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. The slot may be a 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.

Wireless frames, subframes, slots, mini slots and symbols all represent time units when transmitting signals. 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.

TTI may be a transmission time unit such as a channel-encoded 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.

TTI with a time length of 1 ms may be called normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. 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 radio frame, 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 the plural nouns following these articles.

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 Radio communication system 20 NG-RAN
100 gNB
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

A transmitter that sends a first specific message that does not include a random access preamble when certain conditions are met in the random access channel procedure.
A terminal comprising a receiving unit for receiving a second specific message that does not include a timing advance command as a response message to the first specific message in the random access channel procedure.
The predetermined condition includes at least one of a condition in which the reception quality of the signal notified from the network is better than the specific quality and a condition in which the number of transmissions of the first specific message does not exceed the maximum number of transmission attempts. , Terminal.
The terminal according to claim 2, wherein the receiving unit receives system information from a network including an information element indicating at least one of the specific threshold value and the maximum number of transmission attempts.
The receiving unit is an information element indicating at least one of a reference signal setting used for demodulating the first specific message, a resource setting for a transmission opportunity of the first specific message, and a reception window length of the second specific message. The terminal according to any one of claims 1 to 3, which receives system information including the above from the network.
The random access channel procedure comprises at least three or more types of random access procedures.
The procedure including the transmission of the first specific message and the reception of the second specific message is one of the three or more types of random access procedures.
The terminal according to any one of claims 1 to 4, wherein the receiving unit receives system information from a network including an information element that specifies a trial order of the three or more types of random access procedures.