WO2022009346A1

WO2022009346A1 - Terminal, wireless communication method, and base station

Info

Publication number: WO2022009346A1
Application number: PCT/JP2020/026739
Authority: WO
Inventors: 優元 ▲高▼橋; 慎也熊谷; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-07-08
Filing date: 2020-07-08
Publication date: 2022-01-13

Abstract

A terminal according to one aspect of the present disclosure has: a reception unit that receives downlink control information for instructing a one-shot Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK); and a control unit that determines a priority of the one-shot HARQ-ACK, on the basis of information that is about a priority of UL transmission and that can be acquired from the downlink control information.

Description

Terminals, wireless communication methods and base stations

This disclosure relates to terminals, wireless communication methods and base stations in next-generation mobile communication systems.

Long Term Evolution (LTE) has been specified for the purpose of higher data rate, lower latency, etc. in the Universal Mobile Telecommunications System (UMTS) network (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

A successor system to LTE (for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.

In future wireless communication systems (for example, 5G, NR, etc.), for example, high speed and large capacity (for example, enhanced Mobile Broad Band (eMBB)), ultra-many terminals (for example, massive Machine Type Communication (mMTC), Internet of Things). (IoT)), ultra-high reliability and low latency (for example, Ultra Reliable and Low Latency Communications (URLLC)), and multiple services (also referred to as use cases, communication types, etc.) with different communication requirements are mixed. It is assumed.

For example, Rel. In 16 and later, priorities are set for signals / channels, and it is considered to control communication based on the priorities set for each signal / channel. For example, when a plurality of signals / channels overlap, it is assumed that transmission / reception is controlled based on the priority of each signal / channel.

Further, it is being considered to feed back one or more HARQ-ACKs (or HARQ-ACKs corresponding to one or more downlink shared channels respectively) collectively. Alternatively, it is being considered to classify the downlink shared channels into groups and feed back the HARQ-ACK corresponding to the downlink shared channels on a group-by-group basis.

However, when multiple UL transmissions (for example, HARQ-ACK) are fed back together, how to control the feedback by traveling the country with the priority of each UL transmission has not been sufficiently examined.

Therefore, one of the purposes of the present disclosure is to provide a terminal, a wireless communication method, and a base station capable of appropriately controlling one or more UL transmissions for which priority setting is supported.

The terminal according to one aspect of the present disclosure includes a receiving unit that receives downlink control information instructing a one-shot HARQ-ACK (Hybrid Automatic Repeat reQuest ACK knowledgement), and information regarding the priority of UL transmission that can be acquired from the downlink control information. Based on this, it is characterized by having a control unit for determining the priority of the one-shot HARQ-ACK.

According to one aspect of the present disclosure, one or more UL transmissions for which priority setting is supported can be appropriately controlled.

1A and 1B are diagrams showing an example of UL transmission control based on priority. 2A-2C are diagrams showing other examples of UL transmission control based on priority. FIG. 3 is a diagram showing an example of an enhanced dynamic HARQ feedback method. FIG. 4 is a diagram showing an example of a one-shot HARQ feedback method. FIG. 5 is a diagram showing an example of a case where a plurality of HARQ-ACK codebooks are transmitted in a predetermined slot. FIG. 6 is a diagram showing an example of UL transmission control according to the first aspect. FIG. 7 is a diagram showing an example of UL transmission control according to the second aspect. FIG. 8 is a diagram showing another example of UL transmission control according to the second aspect. FIG. 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 10 is a diagram showing an example of the configuration of a base station according to an embodiment. FIG. 11 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 12 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

<Traffic type>
In future wireless communication systems (eg, NR), further advancement of mobile broadband (eg enhanced Mobile Broadband (eMBB)), machine type communication that realizes multiple simultaneous connections (eg massive Machine Type Communications (mMTC), Internet) Assumed traffic types (also referred to as services, service types, communication types, use cases, etc.) such as of Things (IoT)), high-reliability and low-latency communication (eg, Ultra-Reliable and Low-Latency Communications (URLLC)). Will be done. For example, URLLC requires less delay and higher reliability than eMBB.

The traffic type may be identified at the physical layer based on at least one of the following:
-Logical channels with different priorities-Modulation and Coding Scheme (MCS) table (MCS index table)
-Channel Quality Indication (CQI) table-DCI format-Used for scramble (mask) of Cyclic Redundancy Check (CRC) bits included (added) in the DCI (DCI format). (RNTI: System Information-Radio Network Temporary Identifier)
-RRC (Radio Resource Control) parameters-Specific RNTI (for example, RNTI for URLLC, MCS-C-RNTI, etc.)
-Search space-A predetermined field in DCI (for example, reuse of a newly added field or an existing field)

Specifically, the HARQ-ACK traffic type for PDSCH may be determined based on at least one of the following:
An MCS index table (eg, MCS index table 3) used to determine at least one of the PDSCH modulation order, target code rate, and transport block size (TBS). Whether or not to use)
RNTI used for CRC scrambling of DCI used for scheduling the PDSCH (for example, whether CRC scrambled by C-RNTI or MCS-C-RNTI).

Further, the SR traffic type may be determined based on the upper layer parameter used as the SR identifier (SR-ID). The upper layer parameter may indicate whether the SR traffic type is eMBB or URLLC.

Further, the CSI traffic type may be determined based on the configuration information (CSIreportSetting) related to the CSI report, the DCI type used for the trigger, the DCI transmission parameter, and the like. The setting information, DCI type, etc. may indicate whether the traffic type of the CSI is eMBB or URLLC. Further, the setting information may be an upper layer parameter.

Further, the traffic type of PUSCH may be determined based on at least one of the following.
-The MCS index table used to determine at least one of the modulation order, target code rate, and TBS of the PUSCH (for example, whether or not to use the MCS index table 3).
RNTI used for CRC scrambling of DCI used for scheduling the PUSCH (for example, whether CRC scrambled by C-RNTI or MCS-C-RNTI).

The traffic type may be associated with communication requirements (requirements such as delay and error rate, requirement conditions), data type (voice, data, etc.) and the like.

The difference between the URLLC requirement and the eMBB requirement may be that the URLLC latency is smaller than the eMBB delay, or the URLLC requirement may include a reliability requirement.

For example, the eMBB user (U) plane delay requirement may include that the downlink U-plane delay is 4 ms and the uplink U-plane delay is 4 ms. On the other hand, the URLLC U-plane delay requirement may include that the downlink U-plane delay is 0.5 ms and the uplink U-plane delay is 0.5 ms. Also, the reliability requirement of URLLC may include ^{a 32-byte error rate of 10-5 at a U-plane delay of 1 ms.}

Also, as enhanced Ultra Reliable and Low Latency Communications (eURLLC), the improvement of traffic reliability mainly for unicast data is being considered. In the following, when URLLC and eURLLC are not distinguished, they are simply referred to as URLLC.

<Priority setting>
Rel. In NR after 16 it is considered to set a plurality of levels (for example, 2 levels) of priority for a predetermined signal or channel. For example, communication is controlled by setting different priorities for each signal or channel corresponding to different traffic types (also referred to as service, service type, communication type, use case, etc.) (for example, transmission control in the event of a collision). Is expected to be done. This makes it possible to control communication by setting different priorities for the same signal or channel according to the service type and the like.

The priority is a signal (for example, UCI such as HARQ-ACK, a reference signal, etc.), a channel (PDSCH, PUSCH, PUCCH, etc.), a reference signal (for example, a channel state information (CSI), a sounding reference signal (SRS), etc.). , Scheduling Request (SR), and HARQ-ACK Codebook. Further, priorities may be set for PUCCH used for SR transmission, PUCCH used for HARQ-ACK transmission, and PUCCH used for CSI transmission.

The priority may be defined by a first priority (for example, high) and a second priority (for example, low) which is lower than the first priority. Alternatively, three or more types of priorities may be set.

For example, priorities may be set for the dynamically scheduled HARQ-ACK for PDSCH, HARQ-ACK for semi-persistent PDSCH (SPS PDSCH), and HARQ-ACK for SPS PDSCH release. Alternatively, a priority may be set for the HARQ-ACK codebook corresponding to these HARQ-ACKs. When setting the priority in the PDSCH, the priority of the PDSCH may be read as the priority of HARQ-ACK for the PDSCH.

Further, the priority may be set for the dynamic grant-based PUSCH, the setting grant-based PUSCH, and the like.

Information on the priority may be notified from the base station to the UE using at least one of higher layer signaling and DCI. For example, the priority of the scheduling request may be set by a higher layer parameter (for example, schedulingRequestPriority). The priority of the HARQ-ACK over the PDSCH scheduled by the DCI (eg, the dynamic PDSCH) may be notified by the DCI. The priority of HARQ-ACK for SPS PDSCH may be set by a higher parameter (for example, HARQ-ACK-Codebook-indicator-forSPS), or may be notified by DCI instructing activation of SPS PDSCH. A predetermined priority (for example, low) may be set for the P-CSI / SP-CSI transmitted by PUCCH. On the other hand, the A-CSI / SP-CSI transmitted by PUSCH may be notified of the priority by DCI (for example, DCI for triggering or DCI for activation).

The priority of the dynamic grant-based PUSCH may be notified by the DCI that schedules the PUSCH. Setting Grant-based PUSCH priority may be set by a higher layer parameter (eg, priority). A-SRS triggered by P-SRS / SP-SRS, DCI (eg, DCI format 0_1 / DCI format 2_3) may be set to a predetermined priority (eg, low).

(Overlap of UL transmission)
The UE may control UL transmission based on priority when multiple UL signals / UL channels overlap (or collide).

When multiple UL signals / UL channels overlap, the time resources (or time resources and frequency resources) of multiple UL signals / UL channels overlap, or the transmission timing of multiple UL signals / UL channels is different. It may be the case of overlapping. A time resource may be read as a time domain or a time domain. Time resources may be in symbol, slot, subslot, or subframe units.

Overlapping of multiple UL signals / UL channels in the same UE (eg, intra-UE) means that multiple UL signals / UL channels overlap at least in the same time resource (eg, symbol). You may. Also, collision of UL signals / UL channels in different UEs (eg, inter-UE) means that multiple UL signals / UL channels are overloaded in the same time resource (eg, symbol) and frequency resource (eg, RB). It may mean to wrap.

For example, when a plurality of UL signals / UL channels having the same priority overlap, the UE controls to multiplex the plurality of UL signals / UL channels to one UL channel for transmission (multiplex). See FIG. 1A).

In FIG. 1A, HARQ-ACK (or PUCCH for HARQ-ACK transmission) in which the first priority (high) is set and UL data / UL-SCH in which the first priority (high) is set. (Or PUSCH for UL data / UL-SCH transmission) overlaps. In this case, the UE multiplexes (or maps) the HARQ-ACK to the PUSCH and transmits both the UL data and the HARQ-ACK.

When multiple UL signals / UL channels with different priorities overlap, the UE performs a higher priority UL transmission (eg, prioritizes a higher priority UL transmission) and a lower priority UL transmission. It may be controlled so that it does not exist (for example, it drops) (see FIG. 1B).

In FIG. 1B, the UL data / HARQ-ACK (or the UL channel for UL data / HARQ-ACK transmission) in which the first priority (high) is set and the second priority (low) are set. The case where the UL data / HARQ-ACK (or the UL channel for UL data / HARQ-ACK transmission) overlaps is shown. In this case, the UE controls to drop the UL data / HARQ-ACK having a low priority and prioritize and transmit the UL data / HARQ-ACK having a high priority. The UE may change (for example, postpone or shift) the transmission timing of the UL transmission having a low priority.

When more than two (or three or more) UL signals / UL channels overlap in the time domain (see FIG. 2A), transmission may be controlled by two steps. In the first step, UL channels having the same priority are multiplexed into one UL channel (see FIG. 2B). In the second step, UL transmissions having different priorities may be controlled so as to preferentially transmit UL transmissions having higher priority and drop UL transmissions having lower priority (see FIG. 2C).

(Unlicensed band)
In the unlicensed band (for example, 2.4 GHz band, 5 GHz band, 6 GHz band, etc.), a plurality of systems such as a Wi-Fi system and a system supporting Licensed-Assisted Access (LAA) (LAA system) coexist. Therefore, it is considered that collision avoidance and / or interference control of transmission between the plurality of systems is required.

In the LAA of an existing LTE system (eg, Rel.13), the data transmission device is a device of another device (eg, base station, user terminal, Wi-Fi device, etc.) before transmitting the data in the unlicensed band. Listening (Listen Before Talk (LBT), Clear Channel Assessment (CCA), carrier sense, channel sensing, sensing, channel access procedure) to confirm the presence or absence of transmission is performed.

The transmitting device may be, for example, a base station (for example, gNB: gNodeB) for the downlink (DL) and a user terminal (for example, User Equipment (UE)) for the uplink (UL). Further, the receiving device that receives the data from the transmitting device may be, for example, a user terminal in DL and a base station in UL.

In the LAA of an existing LTE system, the transmitting device starts data transmission after a predetermined period (for example, immediately after or during a backoff period) after the LBT detects that there is no transmission of another device (idle state). ..

The use of unlicensed bands is also being considered for future wireless communication systems (for example, 5G, 5G +, New Radio (NR), 3GPP Rel.15 or later, etc.). The NR system using the unlicensed band may be called an NR-Unlicensed (U) system, an NR LAA system, or the like.

NR-U may also include dual connectivity (DC) between licensed bands and unlicensed bands, and stand-alone (Stand-Alone (SA)) unlicensed bands.

The node (for example, base station, UE) in NR-U confirms that the channel is free (idle) by LBT for coexistence with other systems or other operators, and then starts transmission.

In the NR-U, the base station (for example, gNB) or the UE acquires a transmission opportunity (Transmission Opportunity (TxOP)) when the LBT result is idle and performs transmission. The base station or UE does not transmit when the LBT result is busy (LBT-busy). The time of the transmission opportunity may be referred to as channel occupation time (Channel Occupancy Time (COT)).

LBT-idle may be read as the success of LBT (LBT success). LBT-busy may be read as LBT failure.

(HARQ-ACK codebook)
The UE transmits HARQ-ACK feedback using one PUCCH resource in units of HARQ-ACK codebooks composed of bits of one or more delivery confirmation information (eg, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)). You may. The HARQ-ACK bit may be referred to as HARQ-ACK information, HARQ-ACK information bit, or the like.

Here, the HARQ-ACK codebook includes a time domain (for example, a slot), a frequency domain (for example, a component carrier (CC)), a spatial domain (for example, a layer), and a transport block (TB). )), And a bit for HARQ-ACK in at least one unit of the code block group (Code Block Group (CBG)) constituting the TB may be included. The HARQ-ACK codebook may be simply referred to as a codebook.

The number of bits (size) and the like included in the HARQ-ACK codebook may be determined quasi-static (semi-static) or dynamically (dynamic). The HARQ-ACK codebook whose size is determined quasi-statically is also called a quasi-static HARQ-ACK codebook, a type 1 HARQ-ACK codebook, or the like. The HARQ-ACK codebook whose size is dynamically determined is also called a dynamic HARQ-ACK codebook, a type 2 HARQ-ACK codebook, or the like.

Whether to use the type 1 HARQ-ACK codebook or the type 2 HARQ-ACK codebook may be set in the UE by using the upper layer parameter (for example, pdsch-HARQ-ACK-Codebook).

For a Type 1 HARQ-ACK codebook, the UE will have a PDSCH candidate (or PDSCH opportunity) corresponding to that range, with or without PDSCH scheduling, in a range (eg, a range set based on higher layer parameters). The HARQ-ACK bit for (occasion)) may be fed back.

The range is a set of a specific number of opportunities for receiving candidate PDSCHs, or a specific number of monitoring opportunities for a Physical Downlink Control Channel (PDCCH) for a period of time (eg, a specific number of opportunities for receiving a candidate PDSCH (PDCCH). Monitoring occasion)), the number of CCs set or activated in the UE, the number of TBs (number of layers or ranks), the number of CBGs per TB, and the presence or absence of spatial bundling. You may. The specific range is also referred to as a HARQ-ACK window, a HARQ-ACK bundling window, a HARQ-ACK feedback window, and the like.

In the type 1 HARQ-ACK codebook, within a specific range, the UE allocates the HARQ-ACK bit for the PDSCH in the codebook even if there is no PDSCH scheduling for the UE. If the UE determines that the PDSCH is not actually scheduled, the UE can feed back the bit as a NACK bit.

On the other hand, in the case of the type 2 HARQ-ACK codebook, the UE may feed back the HARQ-ACK bit for the scheduled PDSCH within the above specific range.

Specifically, the UE determines the number of bits in the Type 2 HARQ-ACK codebook based on a particular field in the DCI (eg, the Downlink Assignment Indicator (Index) (DAI) field). May be good. The DAI field may include a counter DAI (Counter DAI (C-DAI)) and a total DAI (Total DAI (T-DAI)).

C-DAI may indicate a counter value of downlink transmission (PDSCH, data, TB) scheduled within a specific period. For example, a C-DAI in a DCI that schedules data within that particular period may indicate a number that is first counted in the frequency domain (eg, CC) and then in the time domain within that particular period. good. For example, C-DAI may receive PDSCH or semi-persistent scheduling (SPS) for one or more DCIs included in a particular period in ascending order of serving cell index and then in ascending order of PDCCH monitoring opportunities. It may correspond to the value obtained by counting the releases.

T-DAI may indicate the total value (total number) of data scheduled within a specific period. For example, a T-DAI in a DCI that schedules data in a time unit (eg, PDCCH monitoring opportunity) within that particular period may be up to that time unit (also referred to as point, timing, etc.) within that particular period. It may indicate the total number of scheduled data.

It is also being considered that the HARQ-ACK codebook is set separately for different service types (or PDSCH or HARQ-ACK with different priorities). That is, it is conceivable that a plurality of HARQ-ACK codebooks are simultaneously configured to support a plurality of service types (or a plurality of priorities). For example, a first HARQ-ACK codebook corresponding to URLLC (eg, first priority) and a second HARQ-ACK codebook corresponding to eMBB (eg, second priority) are configured. May be good.

In this case, the first PUCCH setting parameter corresponding to the first HARQ-ACK codebook (for example, PUCCH configuration or PUCH configuration parameters) and the second PUCCH setting parameter corresponding to the second HARQ-ACK codebook. May be supported or configured separately. The PUCCH setting parameters are the PUCCH resource (or PUCCH resource set) applied to the HARQ-ACK transmission, the PUCCH transmission timing (for example, K1 set), the maximum coding rate (for example, max-code rate), and the PUCCH transmission. It may be at least one of the electric power.

In this case, the first PUCCH setting information may be applied to the HARQ-ACK feedback for URLLC, and the second PUCCH setting information may be applied to the HARQ-ACK feedback for eMBB.

(HARQ process)
For UEs configured with Carrier Aggregation (CA) or Dual Connectivity (DC), there may be one independent HARQ entity for each cell (CC) or cell group (CG). The HARQ entity may manage multiple HARQ processes in parallel.

In the wireless communication system, data transmission is based on scheduling, and downlink (DL) data transmission scheduling information is carried by downlink control information (DCI). A HARQ process number (HARQ Process Number (HPN)) is given to the HARQ process. The DCI includes a 4-bit HARQ process number field indicating the HARQ process number used for current data transmission. The HARQ entity manages multiple (up to 16) HARQ processes in parallel. That is, the HARQ process numbers exist from HPN0 to HPN15. The HARQ process number is also called a HARQ process identifier (HARQ process identifier).

The unit for transmitting Uplink (UL) data on the Physical Uplink Shared Channel (PUSCH) and the unit for transmitting DL data on the Physical Downlink Shared Channel (PDSCH) are called transport blocks (TB). May be good. TB is a unit handled by the Media Access Control (MAC) layer. HARQ (retransmission) control may be performed for each TB, or for each code block group (Code Block Group (CBG)) including one or more code blocks (Code Block (CB)) in the TB. It may be done.

The user terminal outputs information indicating an acknowledgment (Positive Acknowledgement (ACK)) / negative response (Negative Acknowledgement (NACK)) of HARQ indicating whether or not the DL transport block received using the PDSCH was successfully decoded. , PUCCH (Physical Uplink Control Channel) or PUSCH is used to transmit to the base station.

When multiple UL data or multiple DL data are not spatially multiplexed in the physical layer, a single HARQ process corresponds to one transport block (TB). When multiple UL data or multiple DL data are spatially multiplexed in the physical layer, a single HARQ process may correspond to one or more transport blocks (TB).

(Enhanced Dynamic HARQ Feedback)
Rel. From 16 onwards, in a resource, a HARQ-ACK codebook containing multiple HARQ-ACK processes to provide a transmission opportunity for HARQ-ACK feedback due to LBT failure in the UE or PUCCH detection error in the base station. It is being considered to request or trigger the UE to provide feedback. The HARQ-ACK process (eg, DL HARQ-ACK process) may be HARQ-ACK in all CCs configured on the UE in the PUCCH group.

HARQ-ACK (or HARQ-ACK codebook) feedback that includes multiple HARQ-ACK processes includes enhanced dynamic HARQ-ACK feedback, enhanced dynamic HARQ feedback, and group-based. ) HARQ feedback, enhanced dynamic HARQ-ACK codebook, etc. may be referred to. Enhanced dynamic HARQ feedback may be notified from the base station to the UE using a specific DCI format. The particular DCI format may be a UE-specific DCI format (eg, DCI format 1-11).

A particular DCI format (eg, DCI format 1-11) may include a particular field to signal (request or trigger) enhanced dynamic HARQ feedback. The specific field may be at least one of a PDSCH group index (PDSCH group index) field and a number of requested PDSCH group (s) fields.

A specific field (eg, PDSCH group index field, Number of requested PDSCH group (s) field) contained in a specific DCI format (for example, DCI format 1-11) is a specific field. If the higher layer parameter (pdsch-HARQ-ACK-Codebook) is set to enhanced dynamics (eg enhancedDynamic-r16, enhancedDynamic), it may have a bit length of 1 bit, otherwise it may be 0 bits. There may be.

The PDSCH group index (PDSCH group index) may be an index that identifies a group of PDSCHs scheduled by DCI including the PDSCH group index.

If the value of the Number of requested PDSCH group (s) field in the DCI is "0", the UE will provide one or more HARQ feedback to the PDSCH group scheduled by that DCI in a resource. You may go. When the value of the request PDSCH group number field in the DCI is "1", the UE has one or more for the PDSCH group scheduled by the DCI and a PDSCH group different from the PDSCH group scheduled by the DCI. HARQ feedback may be given at a resource. In other words, if the value of the requested PDSCH group number field in the DCI is "1", the UE may provide HARQ feedback to the PDSCH where the PDSCH group indexes "0" and "1" are set in a resource. good.

Further, the specific DCI format (for example, DCI format 1-11) may include a specific field (for example, a new feedback indicator (NFI) field).

A specific field (eg, a New feedback indicator field) contained in a specific DCI format (for example, DCI format 1-11) has a specific upper layer parameter (pdsch-HARQ-ACK-Codebook) enhanced dynamic (for example). If it is set to enhancedDynamic-r16) and another upper layer parameter (NFI-TotalDAI-Included-r16) is set (NFI-TotalDAI-Included-r16 = enable), it has a bit length of 2 bits. You may. Further, in a specific field (for example, a new feedback indicator (New feedback indicator) field), a specific upper layer parameter (pdsch-HARQ-ACK-Codebook) is set to the enhanced dynamic (enhancedDynamic-r16), and another field is used. If the upper layer parameter (NFI-TotalDAI-Included-r16) is not set, it may have a bit length of 1 bit, and in other cases, it may be 0 bit.

The other upper layer parameter (NFI-TotalDAI-Included-r16) includes the NFI and the T-DAI field of the unscheduled PDSCH group in the non-fallback DL grant DCI (eg DCI format 1-11). It may be a parameter indicating whether or not.

A UE requesting or triggering enhanced dynamic HARQ feedback may feed back a codebook containing one or more HARQ-ACK processes using PUCCH / PUSCH.

FIG. 3 is a diagram showing an example of an enhanced dynamic HARQ feedback method. In the example of FIG. 3, the UE monitors PDCCH1 and PDCCH2 in COT # 0 and monitors PDCCH3 in COT # 1. PDSCH1, PDSCH2 and PDSCH3 are scheduled by DCI transmitted in each of PDCCH1, PDCCH2 and PDCCH3. The PDSCH group index indicated for PDSCH1 is 0, and the PDSCH group index indicated for PDSCH2 and PDSCH3 is 1.

In the example of FIG. 3, the UE starts LBT at the start symbols of PDCCH1 and PDCCH3. The UE is instructed by PDCCH1 to transmit HARQ-ACK1 for PDSCH (PDSCH1) of group 0 in the HARQ-ACK transmission resource in COT # 0 (HARQ feedback timing (PDSCH-to-HARQ_feedback timing indicator)). K1 is 2). The UE does not transmit HARQ-ACK1 if the LBT at COT # 0 fails.

Further, in the example of FIG. 3, when the HARQ feedback timing value (K1) included in the DCI received by the PDCCH2 is inapplicable for HARQ-ACK2 for the PDSCH (PDSCH2) of the group 1, the UE is determined. , HARQ-ACK2 is not transmitted (HARQ-ACK2 is retained) in the HARQ-ACK transmission resource in COT # 0.

Further, in the example of FIG. 3, the UE is instructed by PDCCH3 to transmit HARQ-ACK3 for the PDSCH (PDSCH3) of group 1 in the HARQ-ACK transmission resource in COT # 1 (K1 is 2). ). When the value of the request PDSCH group number field included in the DCI of the PDCCH 3 is "1", the PDCCH group (PDSCH group 1) scheduled by the PDCCH 3 and the PDCCH 3 are not scheduled in the HARQ-ACK transmission resource in COT # 1. The PDSCH group (PDSCH group 0) and the HARQ-ACK for the corresponding PDSCH are transmitted.

In the example of FIG. 3, when the UE succeeds in LBT in COT # 1, it transmits HARQ-ACK3. At this time, the UE multiplexes the HARQ-ACK1 that was not transmitted due to the failure of the LBT in COT # 0 and the held HARQ-ACK2 to the transmission resource of the HARK-ACK3, and transmits the HARQ-ACK1.

In this way, the UE may control one or more HARQ-ACK feedback in units of PDSCH groups based on the number of requested PDSCH groups included in the DCI.

(1 shot HARQ feedback)
Rel. From 16 onwards, a HARQ-ACK codebook containing multiple (eg, all) HARQ-ACK processes to provide a transmission opportunity for HARQ-ACK feedback due to an LBT failure in the UE or a PUCCH detection error in the base station. It is being considered to request or trigger feedback from the UE. The HARQ-ACK process (eg, DL HARQ-ACK process) may be HARQ-ACK in multiple (eg, all) CCs configured on the UE in the PUCCH group.

The feedback of HARQ-ACK (or HARQ-ACK codebook) including multiple (eg, all) HARQ-ACK processes in multiple (eg, all) CCs is one-shot (One-shot) HARQ. -ACK feedback One-shot (One-shot) HARQ feedback may be referred to as HARQ-ACK one-shot feedback. The one-shot HARQ feedback may be notified from the base station to the UE using a specific DCI format. The particular DCI format may be a UE-specific DCI format (eg, DCI format 1-11).

A particular DCI format (eg, DCI format 1-11) may include a particular field to signal one-shot HARQ-ACK feedback. The specific field may be a one-shot HARQ-ACK request field.

A specific field (eg, a one-shot HARQ-ACK request field) contained in a specific DCI format (eg, DCI format 1-11) is a specific upper layer parameter (pdsch-HARQ-ACK). When -OneShotFeedback-r16) is set, it may have a bit length of 1 bit, and in other cases, it may be 0 bit.

The one-shot HARQ-ACK request may be a parameter that requests or triggers the UE to transmit a plurality of (for example, all) HARQ processes in a certain resource.

If the value of the one-shot HARQ-ACK request is "0", the UE will provide HARQ feedback to the PDSCH scheduled by the DCI containing the one-shot HARQ-ACK request in a resource. You may go. If the value of the one-shot HARQ-ACK request is "1", the UE has untransmitted HARQ feedback for the PDSCH and HARQ feedback for the PDSCH scheduled by the DCI containing the one-shot HARQ-ACK request. It may be done in resources.

A UE requesting or triggering one-shot HARQ feedback may use PUCCH / PUSCH to feed back a codebook containing a plurality of (for example, all) HARQ-ACK processes in each configured CC. At this time, by including a new data indicator (New Data Indicator (NDI)) in the feedback, it is possible to avoid HARQ inconsistency between the UE and gNB.

FIG. 4 is a diagram showing an example of a one-shot HARQ feedback method. The arrangement of each channel resource and the timing of LBT in the example of FIG. 4 are the same as those of FIG.

In the example of FIG. 4, the UE does not transmit HARQ-ACK1 if the LBT at COT # 0 fails. Further, regarding HARQ-ACK2 for PDSCH2, when the HARQ feedback timing value (K1) included in the DCI received by PDCCH2 is inapplicable, the UE performs the HARQ-ACK transmission resource in COT # 0. , Do not send HARQ-ACK2 (hold HARQ-ACK2).

Also, in the example of FIG. 4, the UE is instructed by PDCCH3 to transmit HARQ-ACK3 for the PDSCH (PDSCH3) of group 1 in the HARQ-ACK transmission resource in COT # 1 (K1 is 2). ). When the UE succeeds in LBT in COT # 1, it transmits HARQ-ACK3. At this time, when the one-shot HARQ feedback is instructed by the DCI received by the PDCCH 3, the UE receives HARQ-ACK1 which was not transmitted due to the failure of the LBT and HARQ-ACK2 which is held in COT # 0. It is multiplexed with the transmission resource of HARK-ACK3 and transmitted.

In this way, the UE may control one or more HARQ-ACK feedbacks based on the one-shot HARQ-ACK request contained in the DCI.

(Multiple HARQ-ACK Codebook)
Rel. From 16 onwards, it may be permissible to configure up to N HARQ-ACK codebooks in a predetermined slot (eg, 1 slot). N may be 2, for example. For example, when N is 2, the UE configures two codebooks for HARQ-ACK having different priorities (or codebooks corresponding to different priorities / different service types) in a predetermined slot, and the code concerned. You may feed back the book.

The UE generates a HARQ-ACK codebook (for example, HARQ-ACK in the HARQ-ACK codebook) based on the value of the priority notification field (for example, Priority Indicator field) included in the DCI corresponding to each PDSCH. Bit generation) may be controlled. FIG. 5 shows an example of generating / feeding back two HARQ-ACK codebooks (here, CB # 0 and CB # 1) corresponding to different priorities in slot # n. CB # 0 corresponds to a second priority (low) or eMBB, and CB # 1 corresponds to a first priority (high) or URLLC.

In FIG. 5, the feedback timing of HARQ-ACK is slot # n (K1 = 5) and the second priority (low) due to the DCI corresponding to the PDSCH transmitted in slot # n-5. , Will be notified. The DCI corresponding to the PDSCH transmitted in slot # n-3 notifies that the feedback timing of HARQ-ACK is slot # n (K1 = 3) and the second priority (low). To.

In FIG. 5, the feedback timing of HARQ-ACK is set to slot # n (subslot #n) by the DCI corresponding to the PDSCH transmitted in slot # n-2 (subslots # n-4, # n-5). It is notified that there is (K1 = 5 subslots) and that it is the first priority (high).

In this case, the UE may generate and feed back two HARQ-ACK codebooks (CB # 0 and CB # 1) in slot # n.

On the other hand, when the UL resource for CB # 0 (for example, PUCCH / PUSCH) and the UL resource for CB # 1 overlap, HARQ- is based on the priority corresponding to HARQ-ACK (or CB). You may control the transmission of ACK.

However, as described above, when multiple HARQ-ACKs are fed back together (for example, when performing one-shot HARQ-ACK feedback or HARQ-ACK feedback based on a PDSCH group), multiple HARQ-ACKs are used for each code. It may be included in the book. In such a case, how to apply / control the priority of UL transmission becomes a problem.

For example, when applying 1-shot HARQ-ACK feedback, it is used for the priority of each HARQ-ACK included in the 1-shot HARQ-ACK feedback, or for 1-shot HARQ-ACK feedback (or 1-shot HARQ-ACK feedback). The problem is how to set / apply the priority corresponding to the codebook).

Alternatively, when feedback of HARQ-ACK is given for each PDSCH group, the priority of each HARQ-ACK included in the PDSCH group or the HARQ-ACK corresponding to the PDSCH group (or the codebook of the HARQ-ACK) is supported. The problem is how to set / apply the priority to be applied.

As one aspect of the present embodiment, the present inventors have a priority over HARQ-ACK (or HARQ-ACK codebook) that feeds back in response to a one-shot HARQ-ACK feedback request, or the HARQ-ACK codebook. The priority of HARQ-ACK to be included in the above was examined, and one aspect of the present embodiment was conceived.

Further, as another aspect of the present embodiment, the present inventors have a priority on HARQ-ACK (or HARQ-ACK codebook) that provides feedback based on a predetermined group (for example, PDSCH group) unit, or The priority of each HARQ-ACK corresponding to the PDSCH group was examined, and another aspect of this embodiment was conceived.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The configurations described in each embodiment may be applied individually or in combination.

Further, in the present disclosure, "A / B" may be read as at least one of A and B, and "A / B / C" may be read as at least one of A, B and C.

Further, the present disclosure can be applied not only to a wireless communication system to which NR-U is applied, but also to a wireless communication system to which NR-U is not applied.

In the following description, two levels of the first priority (high) and the second priority (low) will be described as examples of the priority of UL transmission, but the priority is not limited to the two levels. .. Three or more levels of priority may be set. Further, in the following description, the priority of the HARQ-ACK codebook (or the priority of HARQ-ACK) is the priority of PUCCH used for HARQ-ACK transmission or PUSCH used for HARQ-ACK transmission. It may be read as the priority of.

(First aspect)
In the first aspect, setting / control of the priority of UL transmission when performing HARQ-ACK feedback based on the request of 1-shot HARQ-ACK will be described.

The UE may control one or more HARQ-ACKs to be fed back with a predetermined resource based on the one-shot HARQ-ACK request field included in the DCI (see FIG. 6). FIG. 6 shows HARQ-ACK # 1 corresponding to PDSCH # 1 and HARQ-ACK # 2 corresponding to PDSCH # 2 based on the one-shot HARQ-ACK request included in DCI # 3 that schedules PDSCH # 3. The case where HARQ-ACK # 3 corresponding to PDSCH # 3 is fed back by using a predetermined UL resource is shown.

In the following description, DCI may be read as PDCCH. The UL resource may be read as a HARQ-ACK codebook, a PUCCH resource, or a PUSCH resource.

The priority of HARQ-ACK (or HARQ-ACK codebook) to be fed back based on the one-shot HARQ-ACK request may be determined based on predetermined conditions.

The UE may determine the priority of HARQ-ACK to be fed back based on the 1-shot HARQ-ACK request based on the DCI (DCI # 3 in FIG. 6) including the 1-shot HARQ-ACK request field. .. For example, the UE may determine the priority for the one-shot HARQ-ACK based on the priority indicator field (for example, Priority Indicator field) included in the DCI (option 1-1). Alternatively, the UE may determine the priority for 1-shot HARQ-ACK based on the configuration / parameters applied to the DCI (eg, DCI format) (option 1-2).

<Option 1-1>
The UE may determine the priority of the HARQ-ACK codebook transmitted by the 1-shot HARQ-ACK based on the priority instruction field included in the DCI indicating the 1-shot HARQ-ACK request. A first priority (high) or a second priority (low) may be set by the priority indicating field included in the DCI. The priority is not limited to 2 levels, and any of 3 levels or higher may be notified.

When a plurality of HARQ-ACKs are fed back by using a predetermined resource based on a one-shot HARQ-ACK request, the UE may control to feed back a plurality of HARQ-ACKs having different priorities at once ( Option 1-1-1). Alternatively, when the UE feeds back a plurality of HARQ-ACKs using a predetermined resource based on the one-shot HARQ-ACK request, the UE may control to select and feed back the HARQ-ACK of a specific priority. Good (option 1-1-2).

<Option 1-1-1>
When the one-shot HARQ-ACK feedback is instructed, the UE feeds back one or more target HARQ-ACKs (for example, HARQ-ACK # 1, # 2, # 3 in FIG. 3) regardless of the priority. It may be controlled as follows.

The HARQ-ACK to be fed back includes a first HARQ-ACK with a first priority (high) and a second HARQ-ACK with a second priority (low). Imagine a case. In such a case, the UE may control the first HARQ-ACK and the second HARQ-ACK to be transmitted together (for example, included in the same HARQ-ACK codebook).

When the first priority (high) is indicated by the DCI instructing the one-shot HARQ-ACK request, the UE is of the first priority (high) HARQ-ACK and the second priority (low). At least one of HARQ-ACK may be included in the HARQ-ACK codebook and controlled to be fed back. In this case, the first priority (high) may be set as the priority of the HARQ-ACK codebook to be fed back in response to the one-shot HARQ-ACK request.

The UE is of the first priority (high) HARQ-ACK and the second priority (low) when the second priority (low) is indicated by the DCI instructing the one-shot HARQ-ACK request. At least one of HARQ-ACK may be included in the HARQ-ACK codebook and controlled to be fed back. In this case, a second priority (low) may be set as the priority of the HARQ-ACK codebook to be fed back in response to the one-shot HARQ-ACK request.

In this way, by selecting the HARQ-ACK to be the target of the one-shot HARQ-ACK feedback regardless of the priority, it is possible to feed back more HARQ-ACK in one transmission. The priority of each HARQ-ACK subject to the one-shot HARQ-ACK feedback may be determined based on the DCI that schedules the PDSCH corresponding to each HARQ-ACK.

Alternatively, the HARQ-ACK to be included in the 1-shot HARQ-ACK feedback is determined based on the priority value (eg i) specified in the priority indicator field included in the DCI that directs the 1-shot HARQ-ACK request. You may. For example, even if HARQ-ACK having a priority equal to or higher than the value of the priority indicating field (for example, i) included in the DCI for instructing the one-shot HARQ-ACK request is selected and fed back as one-shot HARQ-ACK. good.

It is assumed that 1, 2, 3, 4 (4 levels) are set in descending order of priority, and 2 is specified in the priority instruction field. If 2 is specified in the priority indicator field contained in the DCI, the UE selects HARQ-ACK with a priority of 2 or higher (eg, 1 or 2) and 1-shot HARQ-ACK feedback. May be applied. This allows one-shot HARQ-ACK feedback to be applied by selecting a particular priority HARQ-ACK.

<Option 1-1-2>
When the one-shot HARQ-ACK feedback is instructed, the UE may control to select and feed back the HARQ-ACK of a specific priority.

For example, as HARQ-ACK to be the target of 1-shot HARQ-ACK feedback, a first HARQ-ACK having a first priority (high) and a second HARQ-ACK having a second priority (low) are used. It is assumed that it is included. In such a case, the UE should send the HARQ-ACKs having either priority (first priority or second priority) together (for example, included in the same HARQ-ACK codebook). You may control it. In this case, the one-shot HARQ-ACK feedback may not be applied to the HARQ-ACK having another priority.

For example, 1-shot HARQ-ACK feedback may be applied to HARQ-ACK having the first priority (high). When a one-shot HARQ-ACK request is instructed, the UE may select one or more HARQ-ACKs having a first priority (high) to provide one-shot HARQ-ACK feedback. The priority of each HARQ-ACK subject to the one-shot HARQ-ACK feedback may be determined based on the DCI that schedules the PDSCH corresponding to each HARQ-ACK.

When applying the one-shot HARQ-ACK feedback to the first priority HARQ-ACK, the first priority may be set for the HARQ-ACK codebook to be fed back. In this case, the DCI for instructing the one-shot HARQ-ACK feedback may not include the priority instruction field. The UE may not expect / expect that one-shot HARQ-ACK feedback is indicated if the DCI includes a priority indicator field.

Alternatively, 1-shot HARQ-ACK feedback may be applied to HARQ-ACK having a second priority (low). When a one-shot HARQ-ACK request is instructed, the UE may select one or more HARQ-ACKs having a second priority (low) to provide one-shot HARQ-ACK feedback.

When applying the 1-shot HARQ-ACK feedback to the HARQ-ACK of the second priority, the HARQ-ACK codebook to be fed back may be set to the second priority. In this case, the DCI for instructing the one-shot HARQ-ACK feedback may not include the priority instruction field. The UE may not expect / expect that one-shot HARQ-ACK feedback is indicated if the DCI includes a priority indicator field.

Alternatively, the priority of HARQ-ACK to which the one-shot HARQ-ACK feedback is applied may be notified / set to the UE by using the upper layer signaling / DCI.

Applying 1-shot HARQ-ACK feedback When notifying the UE of the priority of HARQ-ACK by higher layer signaling, if the notified priority is applied to the HARQ-ACK codebook used for 1-shot HARQ-ACK feedback. good. In this case, the DCI for instructing the one-shot HARQ-ACK feedback may not include the priority instruction field. The UE may not expect / expect that one-shot HARQ-ACK feedback is indicated if the DCI includes a priority indicator field.

The UE may determine the HARQ-ACK to which the 1-shot HARQ-ACK feedback is applied based on a predetermined field (for example, a priority instruction field) included in the DCI that instructs the 1-shot HARQ-ACK request. If the DCI indicating the one-shot HARQ-ACK request indicates a first priority (high), the UE selects one or more HARQ-ACKs with the first priority (high) and 1 Shot HARQ-ACK feedback may be given. Further, the HARQ-ACK codebook (or PUCCH / PUSCH) used for the one-shot HARQ-ACK may have a first priority set.

Alternatively, if the DCI indicating the one-shot HARQ-ACK request indicates a second priority (low), the UE selects one or more HARQ-ACKs with the second priority (low). One-shot HARQ-ACK feedback may be given. Further, the HARQ-ACK codebook (or PUCCH / PUSCH) used for the one-shot HARQ-ACK may have a second priority set.

In this way, by selecting the HARQ-ACK to be the target of the 1-shot HARQ-ACK feedback based on the priority, the 1-shot HARQ-ACK feedback can be flexibly controlled based on the priority.

<Option 1-2>
The UE may determine the priority for the 1-shot HARQ-ACK based on the format of the DCI indicating the 1-shot HARQ-ACK request. A first priority (high) or a second priority (low) may be set based on the DCI format. The priority is not limited to 2 levels, and any of 3 levels or higher may be notified. In the following description, the first DCI format (eg DCI format 1_2) corresponds to the first priority (high) and the second DCI format (eg DCI format 1_1) corresponds to the second priority (low). ) Is taken as an example, but it is not limited to this.

When a plurality of HARQ-ACKs are fed back by using a predetermined resource based on a one-shot HARQ-ACK request, the UE may control to feed back a plurality of HARQ-ACKs having different priorities at once ( Option 1-2-1). Alternatively, when the UE feeds back a plurality of HARQ-ACKs using a predetermined resource based on the one-shot HARQ-ACK request, the UE may control to select and feed back the HARQ-ACK of a specific priority. Good (option 1-2-2).

<Option 1-2-1>
When the one-shot HARQ-ACK feedback is instructed, the UE feeds back one or more target HARQ-ACKs (for example, HARQ-ACK # 1, # 2, # 3 in FIG. 3) regardless of the priority. It may be controlled as follows.

For example, as HARQ-ACK to be the target of 1-shot HARQ-ACK feedback, a first HARQ-ACK having a first priority (high) and a second HARQ-ACK having a second priority (low) are used. It is assumed that it is included. In such a case, the UE may control the first HARQ-ACK and the second HARQ-ACK to be transmitted together (for example, included in the same HARQ-ACK codebook).

When the first priority (high) is specified by the DCI format (for example, DCI format 1_2) instructing the one-shot HARQ-ACK request, the UE has the first priority (high) HARQ-ACK and the first. At least one of the 2 low priority HARQ-ACKs may be included in the HARQ-ACK codebook and controlled to be fed back. In this case, the first priority (high) may be set as the priority of the HARQ-ACK codebook) that feeds back in response to the one-shot HARQ-ACK request.

If the second priority (low) is indicated by the DCI format (eg, DCI format 1-11) instructing the one-shot HARQ-ACK request, the UE has a first priority (high) HARQ-ACK and a second. At least one of the 2 low priority HARQ-ACKs may be included in the HARQ-ACK codebook and controlled to be fed back. In this case, a second priority (low) may be set as the priority of the HARQ-ACK codebook to be fed back in response to the one-shot HARQ-ACK request.

In this way, by selecting the HARQ-ACK to be the target of the one-shot HARQ-ACK feedback regardless of the priority, it is possible to feed back more HARQ-ACK in one transmission. The priority of each HARQ-ACK subject to the one-shot HARQ-ACK feedback may be determined based on the DCI (for example, DCI format) that schedules the PDSCH corresponding to each HARQ-ACK.

Alternatively, the HARQ-ACK to be included in the 1-shot HARQ-ACK feedback may be determined based on the priority value (eg, i) determined based on the DCI format indicating the 1-shot HARQ-ACK request. For example, a HARQ-ACK having a priority value equal to or higher than the priority value (for example, i) determined based on the DCI format indicating the 1-shot HARQ-ACK request is selected and fed back as a 1-shot HARQ-ACK. You may.

It is assumed that 1, 2, 3, 4 (4 levels) are set in descending order of priority, and 2 is indicated by the DCI format. If 2 is specified by the DCI format, the UE may select HARQ-ACK with a priority of 2 or higher (eg, 1 or 2) and apply 1-shot HARQ-ACK feedback. .. This allows one-shot HARQ-ACK feedback to be applied by selecting a particular priority HARQ-ACK.

For example, 1-shot HARQ-ACK feedback may be applied to HARQ-ACK having the first priority (high). When a one-shot HARQ-ACK request is instructed, the UE may select one or more HARQ-ACKs having a first priority (high) to provide one-shot HARQ-ACK feedback. The priority of each HARQ-ACK subject to the one-shot HARQ-ACK feedback may be determined based on the DCI format that schedules the PDSCH corresponding to each HARQ-ACK.

When applying the one-shot HARQ-ACK feedback to the first priority HARQ-ACK, the first priority may be set for the HARQ-ACK codebook to be fed back.

When applying the 1-shot HARQ-ACK feedback to the HARQ-ACK of the second priority, the HARQ-ACK codebook to be fed back may be set to the second priority.

When notifying the UE of the priority of HARQ-ACK to which 1-shot HARQ-ACK feedback is applied by higher layer signaling, even if the notified priority is applied to the HARQ-ACK codebook used for 1-shot HARQ-ACK. good. In this case, the DCI format for instructing the one-shot HARQ-ACK feedback may utilize at least one of the first DCI format and the second DCI format.

The UE may determine the HARQ-ACK to which the 1-shot HARQ-ACK feedback is applied based on the DCI format instructing the 1-shot HARQ-ACK request. If a first priority (high) is indicated by a DCI format (eg, DCI format 1_2) instructing a one-shot HARQ-ACK request, the UE has one or more HARQs with the first priority (high). -ACK may be selected to provide 1-shot HARQ-ACK feedback. Further, the HARQ-ACK codebook used for the one-shot HARQ-ACK may have a first priority set.

Alternatively, if a second priority (low) is indicated by a DCI format (eg, DCI format 1-11) instructing a one-shot HARQ-ACK request, the UE is one or more with the second priority (low). HARQ-ACK may be selected to provide one-shot HARQ-ACK feedback. Further, the HARQ-ACK codebook used for the one-shot HARQ-ACK may have a second priority set.

<Variations>
The priority of the 1-shot HARQ-ACK feedback may be determined by using either the option 1-1 or the option 1-2 described above. In this case, the UE may be notified / set by higher layer signaling as to whether option 1-1 or option 1-2 is to be used.

When a predetermined upper layer parameter (for example, PriorityIndicator-ForDCIFormatX_Y) is set (for example, when a priority specification field exists in the DCI format X_Y), the above option 1-1 is used to provide 1-shot HARQ-ACK feedback. You may decide the priority. In other cases (for example, when a predetermined upper layer parameter is not set), the above option 1-2 may be used to determine the priority of the 1-shot HARQ-ACK feedback.

Further, the method shown in option 1-1 or option 1-2 may be applied to the HARQ-ACK fed back by the one-shot HARQ-ACK feedback.

Alternatively, option 1-1 and option 1-2 may be applied in combination as appropriate. For example, the priority of the one-shot HARQ-ACK feedback itself is determined based on the format of the DCI that directs the one-shot HARQ-ACK feedback. On the other hand, the priority of each HARQ-ACK may be determined based on the priority specification field included in the DCI that schedules the PDSCH corresponding to each HARQ-ACK.

Alternatively, the priority of the 1-shot HARQ-ACK feedback itself is determined based on the priority specification field included in the DCI that indicates the 1-shot HARQ-ACK feedback. On the other hand, the priority of each HARQ-ACK may be determined based on the format of the DCI that schedules the PDSCH corresponding to each HARQ-ACK.

(Second aspect)
In the second aspect, setting / control of the priority of UL transmission when performing HARQ-ACK feedback by using a predetermined group (for example, PDSCH group) will be described.

The UE may determine the HARQ-ACK to be fed back based on the number of requested PDSCH group (s) field included in the DCI. For example, if the UE has a value of "0" in the Number of requested PDSCH group (s) field, the UE has one or more HARQ feedbacks for the PDSCH groups scheduled by its DCI. This may be done in resources (see Figure 7).

FIG. 7 corresponds to a PDSCH group (here, PDSCH group # 1) corresponding to PDSCH # 3 scheduled by DCI # 3, based on the number of requested PDSCH groups included in DCI # 3 that schedules PDSCH # 3. Shows a case where one or more HARQ-ACKs (here, HARQ-ACK # 2 and # 3) are fed back by using a predetermined UL resource.

On the other hand, when the value of the request PDSCH group number field in the DCI is "1", the UE has a PDSCH group scheduled by the DCI and a PDSCH group different from the PDSCH group scheduled by the DCI. One or more HARQ feedbacks to a resource may be given at a resource (see Figure 8).

FIG. 8 shows a PDSCH group (here, PDSCH group # 1) corresponding to PDSCH # 3 scheduled by DCI # 3, based on the number of requested PDSCH groups included in DCI # 3 that schedules PDSCH # 3. One or more HARQ-ACKs (here, HARQ-ACK # 1, # 2, # 3) corresponding to different PDSCH groups (here, PDSCH group # 0) are fed back using predetermined UL resources. Shows the case.

The PDSCH group index may notify the UE using the DCI that schedules the PDSCH. Further, the PDSCH group index may be a predetermined number (for example, two). When there are two PDSCH group indexes set (for example, indexes 0 and 1) and the value of the requested PDSCH group number field in the DCI is "1", the UE has

PDSCH group indexes

0 and 1. HARQ feedback for the set PDSCH may be performed at a certain resource.

In the following description, the request PDSCH group number field included in the DCI feeds back one or more HARQ-ACKs to the PDSCH group scheduled by the DCI (Case 1), and the PDSCH group scheduled by the DCI. , A case where one or more HARQ-ACKs are fed back to a PDSCH group different from the PDSCH group (Case 2) will be described as an example.

<Case 1>
In case 1 (for example, see FIG. 7), HARQ-ACK (or PDSCH) having different priorities may correspond to the same group (option 2-1). In this case, a plurality of priorities (eg, two priorities) are classified / corresponding within the same PDSCH group. For example, in FIG. 7, PDSCH # 2 (or HARQ-ACK # 2) and PDSCH # 3 (or HARQ-ACK # 3) may have different priorities. This makes it possible to flexibly set the PDSCH corresponding to each group.

Alternatively, a configuration in which only HARQ-ACK (or PDSCH) having the same priority corresponds to the same group, or a configuration in which HARQ-ACK having different priorities does not allow the same group to correspond. (Option 2-2) may be used. In this case, only the same priorities (eg, one priority) are classified / matched within the same PDSCH group. For example, in FIG. 7, PDSCH # 2 (or HARQ-ACK # 2) and PDSCH # 3 (or HARQ-ACK # 3) are set to have the same priority.

<Option 2-1A>
If multiple priorities (eg, two priorities) are supported to correspond to the same PDSCH group, the UE will have multiple priorities HARQ-based on the DCI containing the request PDSCH group count field. It may be controlled to feed back ACK (option 2-1-1).

The UE may provide HARQ-ACK feedback using a plurality of HARQ-ACK codebooks corresponding to each priority. For example, the UE is specified by the number of requested PDSCH groups using the first HARQ-ACK codebook corresponding to the first priority and the second HARQ-ACK codebook corresponding to the second priority. The HARQ-ACK corresponding to the PDSCH group (for example, PDSCH group # 1 in FIG. 7) may be fed back.

The priority of each HARQ-ACK codebook may be determined based on the priority of HARQ-ACK included in each HARQ-ACK codebook. For example, the first HARQ-ACK codebook may be set to a first priority (high) and the second HARQ-ACK codebook may be set to a second priority (low). Alternatively, a common priority may be set for the first HARQ-ACK codebook and the second HARQ-ACK codebook.

Alternatively, the UE may control to feed back a plurality of HARQ-ACKs having different priorities by using a common HARQ-ACK codebook. In this case, the priority of the HARQ-ACK codebook containing a plurality of HARQ-ACKs having different priorities is the priority specification field included in the DCI (for example, the DCI including the request PDSCH group number field), or the format of the DCI. It may be determined based on.

The priority of each HARQ-ACK (or HARQ-ACK corresponding to each PDSCH) contained in the same PDSCH group is determined based on the priority specification field included in the DCI corresponding to each PDSCH or the DCI format. You may. PDSCHs are accumulated in the same PDSCH group regardless of the priority of the PDSCH.

When the UE detects a DCI containing a requested PDSCH group number field (for example, “0”), the UE controls to give feedback on HARQ-ACK corresponding to the PDSCH group scheduled in the DCI regardless of priority. do.

In this way, by allowing different priorities to correspond to the same PDSCH group, the priority and PDSCH group can be flexibly set. Further, when performing HARQ-ACK feedback using the PDSCH group unit, it is possible to feed back HARQ-ACK regardless of the priority by feeding back HARQ-ACK of a plurality of priorities.

Alternatively, the UE may control to select and feed back HARQ-ACK of a specific priority based on the request PDSCH group number field included in the DCI (option 2-1-2). That is, HARQ-ACK of a predetermined priority may be selectively fed back while supporting the association of a plurality of priorities with respect to the predetermined group.

The priority of HARQ-ACK to give feedback may be defined in advance in the specification (for example, high is feedback), or may be determined based on DCI / upper layer signaling. For example, when the first priority and the second priority correspond to the same PDSCH group, either the HARQ-ACK corresponding to the first priority or the HARQ-ACK corresponding to the second priority is fed back. It may be determined based on DCI / upper layer signaling.

Even if the priority of each HARQ-ACK (or HARQ-ACK corresponding to each PDSCH) included in the PDSCH group is determined based on the priority specification field included in the DCI corresponding to each PDSCH or the DCI format. good. PDSCHs are accumulated in the same PDSCH group regardless of the priority of the PDSCH.

If the UE detects a DCI containing a requested PDSCH group number field (eg, “0”), the UE will have a particular priority HARQ-ACK of the HARQ-ACKs corresponding to the PDSCH groups scheduled in the DCI. It may be controlled to feed back only.

The specific priority may be determined based on the priority specification field included in the DCI including the request PDSCH group number field (eg, "0"), or the format of the DCI. Alternatively, the particular priority is a priority specification field contained in at least one of the DCIs used for scheduling PDSCHs belonging to the PDSCH group (eg, the last transmitted DCI), or the format of the DCI. It may be determined based on.

When only the HARQ-ACK of a specific priority is fed back, the specific priority may be set as the priority of the HARQ-ACK codebook used for the feedback.

In this way, when performing HARQ-ACK feedback using the PDSCH group unit, the HARQ-ACK feedback of a specific priority is selected and fed back to control the HARQ-ACK feedback according to the priority. It becomes possible.

<Option 2-2A>
If multiple priorities do not support the same PDSCH group, or if only a particular priority (eg, one priority) corresponds to the same PDSCH group, the UE will request a PDSCH group count field. The HARQ-ACK corresponding to each PDSCH group may be controlled to be fed back based on the DCI including.

Of a plurality of (for example, two) PDSCH groups, one PDSCH group may correspond to the first priority, and the other PDSCH group may correspond to the second priority. Alternatively, the same priority may correspond to a plurality of PDSCH groups. Information about the PDSCH group and the corresponding priority may be notified / set to the UE using higher layer signaling / DCI.

When the priority of the PDSCH scheduled by DCI becomes the second priority (low), it may correspond to a specific PDSCH group (for example, index “0”). In this case, the priority specification field included in the DCI (for example, the DCI including the DCI / request PDSCH group number field for scheduling PDSCH) is set to "0" (or the DCI format is 1-1-1) and is included in the DCI. The PDSCH group index field may be set to "0".

When the priority of the PDSCH scheduled by DCI is the first priority (high), it may correspond to a specific PDSCH group (for example, index “1”). In this case, the priority specification field included in the DCI (for example, the DCI including the DCI / request PDSCH group number field for scheduling PDSCH) is set to "1" (or the DCI format is 1_2) and is included in the DCI. The PDSCH group index field may be set to "1".

When the UE detects a DCI containing a requested PDSCH group number field (eg, “0”), the UE controls to feed back one or more HARQ-ACKs corresponding to PDSCH group # 1 scheduled in the DCI. do. For example, a DCI containing the request PDSCH group number field (eg DCI # 3) specifies a second priority (low) and another DCI transmitted prior to the DCI # 3 (eg DCI # 2). ) Specifies PDSCH group # 1 (and the second priority). In such a case, the UE uses the same HARQ-ACK codebook for HARQ-ACK corresponding to PDSCH # 2 scheduled in DCI # 2 and HARQ-ACK # 3 corresponding to PDSCH # 3 scheduled in DCI # 3. You may include it in and give feedback. In addition, a second priority may be set in the HARQ-ACK codebook.

Alternatively, if the UE detects a DCI containing a requested PDSCH group number field (eg, “0”), the UE may feed back one or more HARQ-ACKs corresponding to the PDSCH group # 1 scheduled in the DCI. To control. For example, a DCI containing the request PDSCH group number field (eg DCI # 3) specifies a first priority (high) and another DCI transmitted prior to the DCI # 3 (eg DCI # 2). ) Specifies PDSCH group # 1 (and the first priority). In such a case, the UE performs the same HARQ-ACK # 2 corresponding to PDSCH # 2 scheduled by DCI # 2 and HARQ-ACK # 3 corresponding to PDSCH # 3 scheduled by DCI # 3. You may include it in the codebook and give feedback. Further, the first priority may be set in the HARQ-ACK codebook.

<Variations>
The UE is assigned to a predetermined PDSCH group based on a priority value (eg, i) determined from a DCI (eg, a DCI indicating the number of requested PDSCH groups, or a DCI scheduling PDSCHs contained in a predetermined PDSCH group). The HARQ-ACK to be fed back may be determined. For example, a HARQ-ACK having a priority value (eg, i) or higher obtained from the DCI may be selected and included in the HARQ-ACK feedback for a predetermined PDSCH group.

If the UE detects a DCI containing a requested PDSCH group number field (eg, “0”), the UE has a HARQ-ACK (or a priority equal to or higher than the priority of PDSCH group # 1 scheduled in the DCI). The PDSCH group's HARQ-ACK) is controlled to be fed back. For example, a DCI (DCI # 3) containing the request PDSCH group number field specifies a second priority (low), which is higher than the second priority by DCI # 2 transmitted prior to DCI # 3. It is assumed that PDSCH # 2 (and the first priority) having a priority is specified. In such a case, the UE may include HARQ-ACK # 2 corresponding to PDSCH # 2 and HARQ-ACK # 3 corresponding to PDSCH # 3 in the same HARQ-ACK codebook for feedback. Further, a first priority or a second priority may be set in the HARQ-ACK codebook.

In the above description, the case where the priority instruction field "0" and the PDSCH group index "0" correspond to each other and the priority instruction field "1" and the PDSCH group index "1" correspond to each other is shown, but the present invention is limited to this. No. The priority instruction field "0" may correspond to the PDSCH group index "1", and the priority instruction field "1" may correspond to the PDSCH group index "0".

Further, the DCI format 1_1 may correspond to the PDSCH group index “0”, and the DCI format 1_2 may correspond to the PDSCH group index “1”. Alternatively, the DCI format 1_1 may correspond to the PDSCH group index “1”, and the DCI format 1_2 may correspond to the PDSCH group index “0”. The association between the DCI format and the PDSCH group index may be notified / set to the UE by using higher layer signaling or the like.

When a priority indicator field (for example, Priority Indicator field) exists in DCI, the PDSCH group index field (for example, PDSCH group index field) may not exist or may not be set to "0".

In this case, the priority and the PDSCH group index may be related. Further, when a predetermined upper layer parameter (for example, hpdsch-HARQ-ACK-Codebook = enhancedDynamic-r16) is set, the priority indicator field may specify the corresponding PDSCH group index. Thereby, the number of bits of DCI can be reduced.

The PDSCH group may be configured to have restrictions on the priority to be set, or may be configured not to be restricted. As a configuration in which the restriction is provided, for example, one of the two PDSCH groups may correspond to the first priority (high) and the other may correspond to the second priority (low). .. As an unrestricted configuration, for example, a configuration in which the same priority (for example, high) corresponds to both of two PDSCH groups may be used.

<Case 2>
Case 2 corresponds to the case where one or more HARQ-ACKs are fed back to the PDSCH group scheduled by the DCI and the PDSCH group different from the PDSCH group by the request PDSCH group number field included in the DCI. (See, for example, FIG. 8).

In case 2, HARQ-ACK (or PDSCH) having different priorities may correspond to the same group (option 2-1). In this case, a plurality of priorities (eg, two priorities) are classified / corresponding within the same PDSCH group. For example, in FIG. 8, PDSCH # 2 (or HARQ-ACK # 2) and PDSCH # 3 (or HARQ-ACK # 3) included in group # 1 may have different priorities.

Alternatively, a configuration in which only HARQ-ACK (or PDSCH) having the same priority corresponds to the same group, or a configuration in which HARQ-ACK having different priorities does not allow the same group to correspond. (Option 2-2) may be used. In this case, only the same priorities (eg, one priority) are classified / matched within the same PDSCH group. For example, in FIG. 8, PDSCH # 2 (or HARQ-ACK # 2) and PDSCH # 3 (or HARQ-ACK # 3) are set to have the same priority.

<Option 2-1B>
If multiple priorities (eg, two priorities) are supported to correspond to the same PDSCH group, the UE will have multiple priorities HARQ-based on the DCI containing the request PDSCH group count field. It may be controlled to feed back ACK (option 2-1-1).

The UE may provide HARQ-ACK feedback using a plurality of HARQ-ACK codebooks corresponding to each priority / each PDSCH group. For example, the UE is specified by the number of requested PDSCH groups using the first HARQ-ACK codebook corresponding to the first priority and the second HARQ-ACK codebook corresponding to the second priority. The HARQ-ACK corresponding to the PDSCH group (for example, PDSCH groups # 0 and # 1 in FIG. 8) may be fed back.

Alternatively, the UE uses a first HARQ-ACK codebook corresponding to the first PDSCH group and a second HARQ-ACK codebook corresponding to the second PDSCH group to correspond to each PDSCH group. HARQ-ACK may be fed back. In this case, the first HARQ-ACK codebook may contain a plurality of HARQ-ACKs having different priorities. Further, the second HARQ-ACK codebook may contain a plurality of HARQ-ACKs having different priorities.

The priority of a HARQ-ACK codebook containing multiple HARQ-ACKs with different priorities is based on the priority specification field contained in the DCI (eg, the DCI containing the requested PDSCH group number field) or the format of the DCI. It may be decided. Alternatively, it may be determined based on the priority corresponding to each PDSCH group.

Even if the priority of each HARQ-ACK (or HARQ-ACK corresponding to each PDSCH) included in the PDSCH group is determined based on the priority specification field included in the DCI corresponding to each PDSCH or the DCI format. good. Each PDSCH is accumulated in the corresponding PDSCH group regardless of the priority of the PDSCH.

If the UE detects a DCI containing a requested PDSCH group number field (eg, value "1"), the UE will include HARQ-ACK # 2, # 3, corresponding to PDSCH group # 1 scheduled in the DCI, and the said. It is controlled so that the HARQ-ACK # 1 corresponding to the PDSCH group # 0 different from the PDSCH group # 1 is fed back regardless of the priority.

Alternatively, the UE may control to select and feed back HARQ-ACK of a specific priority based on the request PDSCH group number field included in the DCI (option 2-1-2).

Even if the priority of each HARQ-ACK (or HARQ-ACK corresponding to each PDSCH) included in the PDSCH group is determined based on the priority specification field included in the DCI corresponding to each PDSCH or the DCI format. good. The PDSCH is accumulated in the corresponding PDSCH group regardless of the priority of the PDSCH.

If the UE detects a DCI containing a requested PDSCH group number field (eg, “1”), the UE will have a particular priority HARQ-ACK of the HARQ-ACK corresponding to the PDSCH group # 1 scheduled in the DCI. It is controlled to feed back only the HARQ-ACK of a specific priority among the ACK and the HARQ-ACK corresponding to another PDSCH group # 0.

For example, the specific priority may be determined based on the priority specification field included in the DCI including the request PDSCH group number field (eg, "1"), or the format of the DCI. Alternatively, the particular priority is a priority specification field contained in at least one of the DCIs used for scheduling PDSCHs belonging to the PDSCH group (eg, the last transmitted DCI), or the format of the DCI. It may be determined based on.

Alternatively, the specific priority may be determined based on the PDSCH group (eg, PDSCH group index). Information regarding the correspondence between the priority and the PDSCH group may be notified / set to the UE by higher layer signaling.

When only the HARQ-ACK of a specific priority is fed back, the priority of the HARQ-ACK codebook used for the feedback may be set to a specific priority.

<Option 2-2B>
If multiple priorities do not support the same PDSCH group, or if only a particular priority (eg, one priority) corresponds to the same PDSCH group, the UE will request a PDSCH group count field. The HARQ-ACK corresponding to each PDSCH group may be controlled to be fed back based on the DCI including.

If the UE detects a DCI # 3 containing a requested PDSCH group number field (eg, “1”), the UE has one or more HARQ-ACK # 2 corresponding to the PDSCH group # 1 scheduled in the DCI # 3. , # 3 and HARQ-ACK # 1 corresponding to another PDSCH group # 0 are controlled to be fed back. For example, a second priority (low) is specified by DCI # 3 including the request PDSCH group number field, and another PDSCH group # 0 (and a second) by DCI # 1 transmitted prior to DCI # 3. Priority or first priority) is specified.

In such a case, the UE has HARQ-ACK # 2 and # 3 for PDSCH group # 1 including PDSCH # 3 scheduled in DCI # 3, and PDSCH # 1 (PDSCH group # 0) scheduled in DCI # 1. HARQ-ACK # 1 may be included in the same or different HARQ-ACK codebooks for feedback. When transmitting with a different HARQ-ACK codebook, even if the priority corresponding to each PDSCH group or the priority specified by the DCI that schedules the PDSCH of each PDSCH group is set to the corresponding HARQ-ACK codebook. good.

Further, the first priority (high) is specified by DCI # 3 including the request PDSCH group number field, and another PDSCH group # 0 (and the first PDSCH group # 0) is specified by DCI # 1 transmitted before the DCI # 3. It is assumed that a priority or a second priority) is specified.

If the UE detects a DCI # 3 containing a requested PDSCH group number field (eg, “1”), the UE has a HARQ-that has a priority equal to or higher than the priority of the PDSCH group # 1 scheduled in the DCI # 3. Control to feed back ACK and HARQ-ACK corresponding to another PDSCH group # 0. The HARQ-ACK corresponding to the other PDSCH group # 0 may be a HARQ-ACK having a priority equal to or higher than the priority of the PDSCH group # 1.

For example, DCI # 3 including the request PDSCH group number field specifies a second priority (low), and DCI # 1 transmitted prior to DCI # 3 gives a higher priority than the second priority. It is assumed that the PDSCH group # 0 (and the first priority) to have is specified. In such a case, the UE has the same or different HARQ-ACK # 3 (and # 2) corresponding to the PDSCH group # 1 scheduled in DCI # 3 and HARQ-ACK # 1 scheduled in DCI # 1. You may include it in the ACK codebook and give feedback. Further, a first priority or a second priority may be set in the HARQ-ACK codebook.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the embodiment of the present disclosure will be described. In this wireless communication system, communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.

FIG. 9 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..

Further, the wireless communication system 1 may support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). MR-DC is a dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and a dual connectivity (NR-E) between NR and LTE. -UTRA Dual Connectivity (NE-DC)) may be included.

In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is MN, and the base station (eNB) of LTE (E-UTRA) is SN.

The wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )) May be supported.

The wireless communication system 1 includes a base station 11 that forms a macrocell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macrocell C1 and forms a small cell C2 that is narrower than the macrocell C1. You may prepare. The user terminal 20 may be located in at least one cell. The arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.

The user terminal 20 may be connected to at least one of a plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).

Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macrocell C1 may be included in FR1 and the small cell C2 may be included in FR2. For example, FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR 2 may be in a frequency band higher than 24 GHz (above-24 GHz). The frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

Further, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

The plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is IAB. It may be called a node.

The base station 10 may be connected to the core network 30 via another base station 10 or directly. The core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).

The user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

In the wireless communication system 1, a wireless access method based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, at least one of the downlink (Downlink (DL)) and the uplink (Uplink (UL)), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple. Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

The wireless access method may be called a waveform. In the wireless communication system 1, another wireless access system (for example, another single carrier transmission system, another multi-carrier transmission system) may be used as the UL and DL wireless access systems.

In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)), a broadcast channel (Physical Broadcast Channel (PBCH)), and a downlink control channel (Physical Downlink Control) shared by each user terminal 20 are used. Channel (PDCCH)) and the like may be used.

Further, in the wireless communication system 1, as the uplink channel, the uplink shared channel (Physical Uplink Shared Channel (PUSCH)), the uplink control channel (Physical Uplink Control Channel (PUCCH)), and the random access channel shared by each user terminal 20 are used. (Physical Random Access Channel (PRACH)) or the like may be used.

User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH. User data, upper layer control information, and the like may be transmitted by the PUSCH. Further, the Master Information Block (MIB) may be transmitted by the PBCH.

Lower layer control information may be transmitted by PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.

The DCI that schedules PDSCH may be called DL assignment, DL DCI, or the like, and the DCI that schedules PUSCH may be called UL grant, UL DCI, or the like. The PDSCH may be read as DL data, and the PUSCH may be read as UL data.

A control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used for PDCCH detection. CORESET corresponds to a resource for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates). One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be referred to as a search space set. The "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting", etc. of the present disclosure may be read as each other.

Depending on the PUCCH, channel state information (Channel State Information (CSI)), delivery confirmation information (for example, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.) and scheduling request (Scheduling Request (for example). Uplink Control Information (UCI) including at least one of SR)) may be transmitted. The PRACH may transmit a random access preamble to establish a connection with the cell.

In this disclosure, downlinks, uplinks, etc. may be expressed without "links". Further, it may be expressed without adding "Physical" to the beginning of various channels.

In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted. In the wireless communication system 1, the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a reference signal for demodulation (DeModulation). Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.

The synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)). The signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like. In addition, SS, SSB and the like may also be called a reference signal.

Further, in the wireless communication system 1, even if a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), or the like is transmitted as an uplink reference signal (Uplink Reference Signal (UL-RS)). good. The DMRS may be called a user terminal specific reference signal (UE-specific Reference Signal).

(base station)
FIG. 10 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140. The control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.

In this example, the functional block of the characteristic portion in the present embodiment is mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.

The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

The control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like. The control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140. The control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of the communication channel, status management of the base station 10, management of radio resources, and the like.

The transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure. be able to.

The transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

The transmitting / receiving antenna 130 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.

The transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.

The transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 120 (transmission processing unit 1211) processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110. RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. may be performed to generate a bit string to be transmitted.

The transmission / reception unit 120 (transmission processing unit 1211) performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted. Processing (if necessary), inverse Fast Fourier Transform (IFFT) processing, precoding, transmission processing such as digital-analog transformation may be performed, and the baseband signal may be output.

The transmission / reception unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..

On the other hand, the transmission / reception unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.

The transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) for the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.

The transmission / reception unit 120 (measurement unit 123) may perform measurement on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal. The measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)). , Signal strength (for example, Received Signal Strength Indicator (RSSI)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 110.

The transmission line interface 140 transmits / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 10, etc., and user data (user plane data) for the user terminal 20 and a control plane. Data or the like may be acquired or transmitted.

The transmission unit and the reception unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission path interface 140.

The transmission / reception unit 120 may transmit downlink control information instructing 1-shot HARQ-ACK. Alternatively, the transmission / reception unit 120 may transmit downlink control information including information indicating the group number of the downlink shared channel and information regarding the group of the downlink shared channel that performs HARQ-ACK feedback.

The control unit 110 may control the reception of the one-shot HARQ-ACK whose priority is determined based on the information regarding the priority of UL transmission notified by the downlink control information.

Alternatively, the control unit 110 may control the reception of HARQ-ACK that is fed back based on at least one of the information regarding the priority of UL transmission notified by the downlink control information and the information regarding the group.

(User terminal)
FIG. 11 is a diagram showing an example of the configuration of the user terminal according to the embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. The control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.

In this example, the functional block of the feature portion in the present embodiment is mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.

The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.

The control unit 210 may control signal generation, mapping, and the like. The control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.

The transmission / reception unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure.

The transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit. The transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting / receiving antenna 230 can be composed of an antenna described based on the common recognition in the technical field according to the present disclosure, for example, an array antenna.

The transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like. The transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.

The transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.

The transmission / reception unit 220 (transmission processing unit 2211) processes, for example, PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.

The transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed, and the baseband signal may be output.

Whether or not to apply the DFT process may be based on the transform precoding setting. When the transform precoding is enabled for a channel (for example, PUSCH), the transmission / reception unit 220 (transmission processing unit 2211) transmits the channel using the DFT-s-OFDM waveform. The DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.

The transmission / reception unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..

On the other hand, the transmission / reception unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.

The transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.

The transmission / reception unit 220 (measurement unit 223) may perform measurement on the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal. The measuring unit 223 may measure received power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 210.

The transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmission / reception unit 220 and the transmission / reception antenna 230.

The transmission / reception unit 220 may receive downlink control information instructing 1-shot HARQ-ACK. Alternatively, the transmission / reception unit 220 may receive downlink control information including information indicating the group number of the downlink shared channel and information regarding the group of the downlink shared channel that provides feedback of HARQ-ACK.

The control unit 210 may determine the priority of the one-shot HARQ-ACK based on the information regarding the priority of UL transmission that can be acquired from the downlink control information. For example, the control unit 210 may control one or more HARQ-ACKs specified by the one-shot HARQ-ACK so as to feed back regardless of the priority of each HARQ-ACK. The control unit 210 may determine the HARQ-ACK to be fed back based on the priority of each HARQ-ACK for one or more HARQ-ACKs specified by the one-shot HARQ-ACK. The control unit 210 may determine the priority of the one-shot HARQ-ACK based on at least one of the information that specifies the priority of UL transmission included in the downlink control information and the format of the downlink control information.

The control unit 210 may control the feedback of HARQ-ACK based on at least one of the information regarding the priority of UL transmission that can be acquired from the downlink control information and the information regarding the group. At least one configuration of downlink shared channels with different priorities and HARQ-ACK with different priorities may be supported for the same group. At least one of a downlink shared channel having the same priority and HARQ-ACK having the same priority may be set for the same group. The control unit 210 may control to feed back HARQ-ACK having the same priority to the same group.

(Hardware configuration)
The block diagram used in the description of the above 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.

Here, the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (configuration unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like. In each case, as described above, the realization method is not particularly limited.

For example, the base station, user terminal, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 12 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment. The base station 10 and the user terminal 20 described above may be physically 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 this disclosure, the terms of devices, circuits, devices, sections, units, etc. can be read as each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors. The processor 1001 may be mounted by one or more chips.

For each function in the base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The 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. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), and the like may be realized by the processor 1001.

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. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized in the same manner for other functional blocks.

The memory 1002 is a computer-readable recording medium, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any other suitable storage medium. It may be composed of one. 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 be executed to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and is, for example, a flexible disk, a floppy disk (registered trademark) disk, an optical magnetic disk (for example, a compact disc (Compact Disc ROM (CD-ROM), etc.), a digital versatile disk, etc.). At least one of Blu-ray® discs), removable discs, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers and other suitable storage media. May be configured by. The storage 1003 may be referred to as an auxiliary storage device.

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 has, 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 (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). May be configured to include. For example, the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be physically or logically separated by the transmission unit 120a (220a) and the reception unit 120b (220b).

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, a Light Emitting Diode (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).

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

Further, the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), and the like. It may be configured to include hardware, and a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
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, channels, symbols and signals (signals or signaling) may be read interchangeably. Also, the signal may be a message. The reference signal may be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard. Further, the component carrier (CC) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

The wireless frame may be configured by one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe. Further, the subframe may be 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.

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

The slot may be composed of one or more symbols in the time domain (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). Further, the slot may be a time unit 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. The minislot may consist of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (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. The time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.

For example, one subframe may be called TTI, a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. 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 the LTE system, the base station schedules each user terminal to allocate radio 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.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, and the like.

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

A resource block (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 the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the RB may include one or more symbols in the time domain, 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.

In addition, one or more RBs are 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, and an RB. It may be called a pair or the like.

Further, the resource block may be composed of one or a plurality of resource elements (Resource Element (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) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be 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.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). 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".

Note that 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 the RB. The number of subcarriers, the number of symbols in TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

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

The names used for parameters, etc. in this disclosure are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed in the present disclosure. Since the various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting in any way. ..

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.

In addition, information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers. Information, signals, etc. may be input / output via a plurality of network nodes.

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

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, the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals or combinations thereof. May be carried out by.

The physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like. Further, MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

The determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).

Software, whether called software, firmware, middleware, microcode, hardware description language, or other names, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , 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, a website where software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.). 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 terms "system" and "network" used in this disclosure may be used interchangeably. The "network" may mean a device (eg, a base station) included in the network.

In the present disclosure, "precoding", "precoder", "weight (precoding weight)", "pseudo-colocation (Quasi-Co-Location (QCL))", "Transmission Configuration Indication state (TCI state)", "space". "Spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", Terms such as "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel" are compatible. Can be used for

In this disclosure, "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission point (Transmission Point (TP))", "Reception point (Reception Point (RP))", "Transmission / reception point (Transmission / Reception Point (TRP))", "Panel" , "Cell", "sector", "cell group", "carrier", "component carrier" and the like 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 (eg, 3) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio). Communication services can also be provided by Head (RRH))). The term "cell" or "sector" refers to a portion or all of the coverage area of at least one of a base station and a base station subsystem that provides communication services in this coverage.

In this disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" are used interchangeably. Can be done.

Mobile stations include 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 terminals, remote terminals. , 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 wireless 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 the base station and the 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 by the user terminal. For example, the communication between the base station and the user terminal is replaced with the communication between a plurality of user terminals (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 user terminal 20 may have the function of the base station 10 described above. Further, the words such as "up" and "down" may be read as words corresponding to the 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 user terminal in the present disclosure may be read as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, the operation performed by the base station may be performed by its upper node (upper node) in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal are a base station, one or more network nodes other than the base station (for example,). Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.

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 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.

Each aspect / embodiment described in the present disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system ( 4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a fraction)), Future Radio Access (FRA), New -Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB) , LTE 802.11 (Wi-Fi®), LTE 802.16 (WiMAX®), LTE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other suitable radios. It may be applied to a system using a communication method, a next-generation system extended based on these, and the like. Further, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

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".

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. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

The term "determining" used in this disclosure may include a wide variety of actions. For example, "judgment (decision)" means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment".

Further, "judgment (decision)" includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as "determining" such as accessing) (for example, accessing data in memory).

In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

The "maximum transmission power" described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal UE maximum transmit power, or may mean the rated maximum transmission power (the). It may mean rated UE maximum transmit power).

The terms "connected", "coupled", or any variation thereof, as used in the present disclosure, are any direct or indirect connections or connections between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are "connected" or "bonded" to each other. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access".

In the present disclosure, when two elements are connected, one or more wires, cables, printed electrical connections, etc. are used, and as some non-limiting and non-comprehensive examples, the radio frequency domain, microwaves. It can be considered to be "connected" or "coupled" to each other using frequency, electromagnetic energy having wavelengths in the region, light (both visible and invisible) regions, 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".

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.

Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as an amended or modified mode without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for purposes of illustration and does not bring any limiting meaning to the invention according to the present disclosure.

Claims

A receiver that receives downlink control information that instructs 1-shot HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement),
A terminal having a control unit for determining the priority of the one-shot HARQ-ACK based on the information regarding the priority of UL transmission that can be acquired from the downlink control information.
The first aspect of claim 1, wherein the control unit controls one or more HARQ-ACKs designated by the one-shot HARQ-ACK so as to feed back regardless of the priority of each HARQ-ACK. Terminal.
The first aspect of the present invention is characterized in that the control unit determines HARQ-ACK to be fed back based on the priority of each HARQ-ACK for one or more HARQ-ACKs designated by the one-shot HARQ-ACK. Described terminal.
The control unit determines the priority of the one-shot HARQ-ACK based on at least one of the information that specifies the priority of UL transmission included in the downlink control information and the format of the downlink control information. The terminal according to any one of claims 1 to 3.
The process of receiving downlink control information instructing 1-shot HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement), and
A wireless communication method comprising: a step of determining the priority of the one-shot HARQ-ACK based on the information regarding the priority of UL transmission that can be acquired from the downlink control information.
A transmitter that transmits downlink control information that instructs 1-shot HARQ-ACK (Hybrid Automatic Repeat reQuest ACKnowledgement),
A base station including a control unit that controls reception of the one-shot HARQ-ACK whose priority is determined based on information regarding the priority of UL transmission notified by the downlink control information.