CN114731633A - Terminal and wireless communication method - Google Patents

Abstract

A terminal according to an aspect of the present disclosure includes: a control unit for determining whether or not an application having a capability of processing time different from that of initial transmission of data is supported for retransmission of the data, and if supported, determining the capability of processing time to be applied to the retransmission; and a transmitting/receiving unit that performs a process of transmission or reception based on the determined capability of the processing time applied to the retransmission. According to an aspect of the present disclosure, processing related to retransmission can be appropriately performed.

Description

Terminal and wireless communication method

Technical Field

The present disclosure relates to a terminal and a wireless communication method in a next generation mobile communication system.

Background

In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3GPP rel.10-14) is standardized for the purpose of further increasing the capacity and the height of LTE (Third Generation Partnership Project (3GPP)) versions (Release (Rel.))8 and 9).

Successor systems to LTE (e.g., also referred to as a 5th generation mobile communication system (5G)), 5G + (plus), New Radio (NR), 3GPP rel.15 and beyond) are also being studied.

Documents of the prior art

Non-patent literature

Non-patent document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In rel.15nr, a processing time of a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)), a processing time of an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH)), or the like is defined. In rel.15nr, the processing time is classified into two processing times, that is, processing time for UE capability 1(UE capability 1) and processing time for UE capability 2(UE capability 2). The processing time for UE capability2 is shorter than the processing time for UE capability 1.

In rel.15nr, the UE whose processing based on UE capability2 is set to be effective determines the processing time of PDSCH/PUSCH based on substantially UE capability2 as described above. On the other hand, NR after rel.16 requires more flexible control.

Therefore, in rel.1698r, it is considered that a UE whose network (base station) has set the intention to perform the processing based on the UE capabilities 1 and 2 performs the processing based on the different UE capabilities for different PDSCHs (or different PUSCHs). However, in the discussion of NR so far, only different UE capabilities are discussed to be applied for initial transmission, and no research has been done for retransmission. If the UE capability at the time of retransmission is not clearly specified, appropriate retransmission processing cannot be realized, and communication throughput may deteriorate.

Therefore, an object of the present disclosure is to provide a terminal and a wireless communication method capable of appropriately performing processing related to retransmission.

Means for solving the problems

A terminal according to an aspect of the present disclosure includes: a control unit for determining whether or not an application having a capability of processing time different from that of initial transmission of data is supported for retransmission of the data, and if supported, determining the capability of processing time to be applied to the retransmission; and a transmission/reception unit that performs transmission or reception processing based on the determined capability of the processing time applied to the retransmission.

Effects of the invention

According to an aspect of the present disclosure, processing related to retransmission can be appropriately performed.

Drawings

Fig. 1 is a diagram illustrating an example of determination of a processing time to be applied to data retransmission according to the second embodiment.

Fig. 2 is a diagram showing another example of determination of a processing time to be applied to data retransmission according to the second embodiment.

Fig. 3 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 4 is a diagram illustrating an example of a configuration of a base station according to an embodiment.

Fig. 5 is a diagram showing an example of the configuration of a user terminal according to an embodiment.

Fig. 6 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(treatment time)

In rel.15nr, a processing time of a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)), a processing time of an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH)), or the like is defined. In addition, the processing time (processing time) may be replaced with a preparation time (preparation time), a preparation process time (preparation process time), a processing process time (processing process time), or the like.

The processing time of the PDSCH may correspond to a period from the end of the last symbol of the PDSCH transmitted to a transport block to a certain uplink (ul) symbol. The UE may also provide valid ACKnowledgement information (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)) via the same or subsequent symbols as the UL symbol.

The processing time of the PUSCH may be a period from the end of the final symbol of a Downlink Control Channel (Physical Downlink Control Channel (PDCCH)) for transmitting Downlink Control Information (DCI) for scheduling the PUSCH to a certain UL symbol. The UE may transmit PUSCH in the same symbol as or subsequent to the UL symbol.

The processing time of the PDSCH may also be based on the parameter N₁(may also be referred to as PDSCH decoding time), and the processing time of the PUSCH may be determined based on the parameter N₂(may also be referred to as PUSCH preparation time).

N₁Or may be determined based on a SubCarrier Spacing (SCS) of a downlink to which the PDSCH is transmitted and an SCS of a UL channel (e.g., PUCCH, PUSCH) to transmit the HARQ-ACK. E.g. N₁Or may be determined based on the smallest SCS among the SCS's, e.g., 8-20 symbols, such as 8 symbols, in the case of 15kHz for the smallest SCS. When additional PDSCH DMRS is set, N₁Or may be judged to be 13-24 symbols.

N₂The determination may be made based on the SCS of the downlink to which the PDCCH for transmitting the DCI for scheduling the PUSCH is transmitted and the SCS of the UL channel to which the PUSCH is transmitted. E.g. N₂Or may be determined based on the smallest of the SCS, e.g., at the SCSWhen the minimum SCS is 15kHz, 10 to 36 symbols such as 10 symbols may be determined.

Namely, the processing time (and the parameter (N) related to the processing time₁、N₂Etc.) may also follow values specified according to a parameter set corresponding to the smallest SCS among PDCCH/PDSCH and PUCCH/PUSCH.

When HARQ-ACK corresponding to PDSCH is transmitted using PUSCH, the UE may transmit PUSCH in UL symbols or symbols after the elapse of a time (total time) obtained by adding the PDSCH processing time and the PUSCH processing time from the end of the final symbol of the PDSCH.

In rel.15nr, the above processing time is classified into both processing time for UE capability 1(UE capability 1) and processing time for UE capability 2(UE capability 2). The processing time for UE capability2 is shorter than the processing time for UE capability 1.

The UE can report to the network (e.g., a base station) whether or not the UE capability2 is supported using different UE capability information (e.g., the former is an RRC parameter "PDSCH-processing type 2", and the latter is an RRC parameter "PUSCH-processing type 2") for each of the PDSCH and the PUSCH. The UE capability X for PDSCH (or PUSCH) may also be referred to as PDSCH (or PUSCH) processing capability X.

The base station may also decide whether the UE processes based on UE capability2 based on the UE capability information. The base station may set, for each of the PDSCH and the PUSCH, information indicating the UE capability2 to be applied (Enabled) to the UE by using higher layer signaling (for example, the former is a parameter "processing type2 Enabled" included in the RRC information element "PDSCH-ServingCellConfig", and the latter is a parameter "processing type2 Enabled" included in the RRC information element "PUSCH-ServingCellConfig"). The former parameter may be referred to as "Capability 2-PDSCH-Processing", and the latter parameter may be referred to as "Capability 2-PUSCH-Processing".

In the present disclosure, the higher layer signaling may be any one of or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, for example.

MAC signaling may also use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), or the like. The broadcast Information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Minimum System Information (RMSI), or Other System Information (OSI).

Further, even when the UE supports UE capability2 and the application of UE capability2 is set from the base station, the UE falls back to UE capability 1 under a certain condition. For example, when the subcarrier spacing is 30kHz (parameter μ of a parameter set is 1) and the number of scheduled resource blocks exceeds 136 for the PDSCH, the UE performs processing of the PDSCH based on the processing time of UE capability 1.

On the other hand, no conditions for fallback to UE capability 1 for PUSCH are defined in the existing rel.15nr specifications.

In rel.15nr, the UE whose processing based on UE capability2 is set to be effective determines the processing time of PDSCH/PUSCH based on UE capability2 basically as described above. On the other hand, NR after rel.16 requires more flexible control.

For example, in Rel.169r, the introduction Of Out-Of-order execution (OOO) processing is being studied. The OOO process corresponds to a case where another second process is started and completed before the first process is started and completed (in a case where the order of starting and completing the processes is reversed). The first processing, the second processing, and the like may correspond to processing for receiving a certain signal or channel (which may be referred to as a signal/channel) and transmitting/receiving another signal/channel corresponding to the signal/channel.

When a plurality of services (which may also be referred to as usage scenarios, communication types, and the like) having different request conditions are used, the necessity of OOO processing becomes high. As the usage situation of NR, for example, high speed and large capacity (e.g., enhanced Mobile broadband (eMBB)), an Ultra-large number of terminals (e.g., large Machine Type Communication (mtc)), Ultra-high reliability, and Low delay (e.g., Ultra Reliable and Low Latency Communication (URLLC)), and the like are being studied.

For example, it is assumed that OOO processing is performed so that the higher importance URLLC data is pushed into the eMBB data.

Therefore, in rel.1698r, it is considered that a UE whose network (base station) has set the intention to perform the processing based on the UE capabilities 1 and 2 performs the processing based on the different UE capabilities for different PDSCHs (or different PUSCHs). However, in the discussion of NR so far, only different UE capabilities are discussed to be applied for initial transmission, and no research has been done for retransmission. If the UE capability at the time of retransmission is not clearly specified, appropriate retransmission processing cannot be realized, and communication throughput may deteriorate.

Therefore, the inventors of the present invention have conceived a method for appropriately performing retransmission processing.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The radio communication methods according to the respective embodiments may be applied individually or in combination.

Hereinafter, the UE capability related to the processing time is simply referred to as a processing time capability (processing time capability). In the following embodiments, the capability of processing time is not limited to the existing UE capabilities 1 and 2.

For example, it may be defined that the processing time for the UE capability 3(UE capability 3) is shorter than the processing time for the UE capability 2. For example, parameter N for PDSCH processing capability 3 with the same SCS comparison₁May also be greater than parameter N for PDSCH processing capability2₁Short. Further, the UE capabilities X (X is an integer) of the present disclosure may also be mutually replaced with the UE capabilities X related to the processing time, respectively.

In the present disclosure, "data" may be replaced with "at least one of PDSCH and PUSCH". The "data" of the present disclosure may be replaced with a Transport Block (TB), a Code Block (CB), a Code Block Group (CBG), a segment (segment), or the like, which is related to at least one of the PDSCH and the PUSCH.

In the following embodiments, the following description will be given mainly of a case where the UE performs initial transmission (initial transmission) and retransmission of data. However, even in the case where the UE receives data that is initially transmitted or retransmitted, if those skilled in the art are concerned, the present disclosure can be easily understood to support embodiments such as replacing (transmitting or transmitting of) transmission (or "transmitting") with (receiving (or receiving of) data "appropriately," replacing "initial transmission (or performing initial transmission)" with "receiving of initial transmission (or receiving of initial transmission)" appropriately, "replacing" retransmission (or performing retransmission) "with" receiving of retransmission (or receiving of retransmission) "appropriately, and the like.

(Wireless communication method)

< first embodiment >

The first embodiment relates to an application of the capability of a UE as to whether or not the retransmission of data supports a processing time different from the initial transmission of the data. This application may also be referred to as an application of the ability to process different processing times in connection with data retransmission.

In addition, how a UE supporting the application of the capability of different processing times for data retransmission applies the capability of different processing times in initial transmission and retransmission will be described later in the second embodiment.

The application of the UE's capability for different processing times in connection with data retransmission may also contemplate any of the following:

(1-1) supporting only retransmission applying a capability higher than that applied to initial transmission;

(1-2) supporting only retransmission applying a capability lower than that applied to initial transmission;

(1-3) supporting both of the above (1-1) and (1-2);

(1-4) both of the above (1-1) and (1-2) are not supported.

Here, higher capability may mean either a shorter processing time capability or a processing time capability with a larger index (e.g., the index of UE capability2 is larger than the index of UE capability 1).

The UE following (1-1) above may retransmit the same data based on the UE capability2 when the initial transmission based on the UE capability 1 fails (for example, transmission fails because more preferential transmission occurs).

The UE according to (1-1) above may retransmit the same data based on the same UE capability2 (or higher UE capability 3 if available) when the initial transmission based on the UE capability2 fails.

The UE following (1-2) above may retransmit the same data based on the UE capability 1 when the initial transmission based on the UE capability2 fails (for example, transmission fails without sufficient processing time).

The UE according to (1-2) above may retransmit the same data based on the same UE capability 1 (or, if available, a lower UE capability X) when the initial transmission based on the UE capability 1 fails.

The UE in (1-3) above may retransmit the same data based on UE capability 1 or 2 (or higher UE capability 3 or lower UE capability X if available) when the initial transmission based on UE capability 1 fails.

The UE according to (1-3) above may retransmit the same data based on UE capability 1 or 2 (or higher UE capability 3 or lower UE capability X if available) when initial transmission based on UE capability2 fails.

The UE following (1-4) above can also be envisaged as an application of the capability that the UE does not support different processing times in relation to data retransmissions. The UE may also apply only the same processing time capability for retransmission of data as for initial transmission of the data. The UE may retransmit the same data based on the same UE capability 1 when the initial transmission based on the UE capability 1 fails. The UE may retransmit the same data based on the same UE capability2 when the initial transmission based on the UE capability2 fails.

The UE may be determined in advance by a specification, may be determined according to a specific UE capability supported (or reported), or may be set by higher layer signaling or the like, as to which of (1-1) to (1-4) the UE uses.

According to the first embodiment described above, it is possible to appropriately control the application of the capability of the UE to support a processing time different from the initial transmission for the retransmission.

< second embodiment >

The second embodiment relates to a capability of processing time applied to data retransmission (in other words, assumed or utilized in processing of retransmission).

The UE supporting the application of the capability of different processing times related to the retransmission may also judge the capability of the processing time applied to the retransmission based on at least one of:

(2-1) fields included in DCI for scheduling retransmission,

(2-2) DCI Format for scheduling retransmission,

(2-3) receiving a COntrol REsource SET (COntrol REsource SET (CORESET)) of DCI for scheduling retransmissions,

(2-4) receiving a Search Space (SS) of the DCI for scheduling retransmissions,

(2-5) Radio Network Temporary Identifier (RNTI)) associated with DCI for scheduling retransmissions,

(2-6) higher layer parameters relating to processing time applied to data retransmission,

(2-7) parameters related to scheduling of initial transmission or retransmission (e.g., time length of data (duration), e.g., number of symbols), size of data (e.g., TB size, CB size, etc.), usage of data (e.g., URLLC-oriented, eMBB-oriented, etc.).

For example, in the case of (2-1) described above, when receiving DCI for instructing retransmission of Data scheduled in the past (for example, when receiving DCI including the same value of a New Data Indicator (NDI) or the same value of a HARQ Process Number (HPN)) field as Data scheduled in the past) and the DCI includes a field for instructing utilization of UE capability X, the UE may retransmit the Data based on the UE capability X. When the DCI does not include a field for indicating the use of the UE capability X, data may be retransmitted based on the same UE capability as that of the initial transmission.

In addition, DCI for indicating retransmission may also include a field indicating utilization of a UE capability higher (or lower or same) than the UE capability applied to initial transmission. The UE may also apply an index to the retransmission that is greater than the UE capability applied to the initial transmission if the value based on this field is indicated to, for example, utilize higher UE capabilities.

As for (2-2) above, when the UE receives DCI format 0_ x or 1_ x for instructing retransmission of data scheduled in the past and the DCI format instructing initial transmission of the data is DCI format 0_ y or 1_ y, the UE may apply UE capability different from the UE capability applied to the initial transmission to the retransmission. In other words, in the case where the DCI formats used for scheduling in retransmission and initial transmission are different, the UE may apply UE capability different from that applied to initial transmission to retransmission.

For example, DCI format 0_ x or 1_ x may correspond to a DCI format for a specific use case (e.g., URLLC), and may be referred to as DCI format 0_2 or 1_ 2. The DCI format 0_ y or 1_ y may be a DCI format for another use case (e.g., eMBB), and may be, for example, y equal to 0 or y equal to 1.

In addition, when receiving DCI format 0_ x or 1_ x for instructing retransmission of data scheduled in the past, the UE may apply UE capability different from the UE capability applied to initial transmission to retransmission regardless of the DCI format instructing initial transmission of the data.

Fig. 1 is a diagram illustrating an example of determination of a processing time to be applied to data retransmission according to the second embodiment. In this example, the case where x is 2 and y is 1 is assumed.

The UE is scheduled for initial transmission of data through DCI format 0_ 1. The UE applies UE capability 1 to the initial transmission and processes it, but the transmission fails. Then, the UE is scheduled for retransmission of the data through DCI format 0_ 2. In this case, the UE may also apply UE capability2 different from UE capability 1 applied to initial transmission to retransmission.

For the above (2-3) and (2-4), the UE can also assume that PDCCHs for different usage scenarios (requests for different services) are scheduled in different CORESET or different search spaces, respectively.

In the above (2-3) and (2-4), when the DCI instructing retransmission of data scheduled in the past is received by the CORESET # n or SS # n and the DCI instructing initial transmission of the data is the DCI received by the CORESET # m or SS # m, the UE may apply UE capability different from the UE capability applied to the initial transmission to the retransmission.

Further, CORESET # n or SS # n may be expressed as CORESET or SS for low delay (or URLLC). CORESET # m or SS # m may also be represented as CORESET or SS that is not for low latency (or not for URLLC).

Fig. 2 is a diagram illustrating another example of determination of a processing time to be applied to data retransmission according to the second embodiment. In this example, assume that n is 2 and m is 1.

The UE receives DCI indicating initial transmission of data at core set #1 or SS # 1. The UE applies UE capability 1 to the initial transmission and processes it, but the transmission fails. Then, the UE receives DCI indicating retransmission of the data at core set #2 or SS # 2. In this case, the UE may also apply UE capability2 different from UE capability 1 applied to initial transmission to retransmission.

In the above (2-5), when the DCI instructing retransmission of the data scheduled in the past has a Cyclic Redundancy Check (CRC) bit scrambled by a specific RNTI (e.g., RNTI for the URLLC or Modulation and Coding Scheme Cell RNTI (MCS-C-RNTI)), the UE may apply UE capability different from that applied to the initial transmission to the retransmission.

As for (2-6) above, the UE may be set with information of UE capability to be applied to retransmission by higher layer signaling. In addition, when the information of the UE capability applied to retransmission indicates (as in initial transmission) the same UE capability or the information of the UE capability applied to retransmission is not set (RRC parameter indicating the information is present), the UE may apply the same UE capability to retransmission as in initial transmission.

As for (2-7) above, when the number of symbols for data retransmission (the length of the time resource for data retransmission) is equal to or greater than (or less than) a certain threshold, the UE may apply UE capability to retransmission that is different from the UE capability applied to initial transmission.

As for (2-7) above, when the size of data to be retransmitted is equal to or larger than (or smaller than) a certain threshold, the UE may apply UE capability to retransmission, which is different from the UE capability applied to initial transmission.

The correspondence relationship between the elements (for example, field values, formats, CORESET, parameter values) represented by (2-1) to (2-7) and the capability of the processing time to be applied to retransmission may be determined in advance according to a specification, or may be set in the UE by higher layer signaling or the like. The x, y, m, n, threshold, and the like may be determined in advance according to a specification, or may be set in the UE by higher layer signaling or the like.

Further, it is also conceivable that a UE capable of applying a plurality of UE capabilities to data transmission and retransmission may always apply a UE capability different from the UE capability applied to initial transmission to retransmission, not in accordance with the above-described (2-1) to (2-7).

The UE may assume that the capability applied to the processing time of the initial transmission is the lowest capability among the supported capabilities (e.g., UE capability 1), and may determine to apply any capability according to the conditions. The UE capability different from the initial transmission applied to the retransmission may also be a UE capability higher or lower than the UE capability applied to the initial transmission.

According to the second embodiment described above, the UE can appropriately determine the capability of the processing time applied to retransmission.

(Wireless communication System)

Hereinafter, a configuration of a radio communication system according to an embodiment of the present disclosure will be described. In this radio communication system, communication is performed using one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.

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

In addition, the wireless communication system 1 may also support Dual Connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). The MR-DC may include Dual connection of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC))), Dual connection of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC))), and the like.

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

The wireless communication system 1 may support Dual connection between a plurality of base stations in the same RAT (for example, Dual connection between an MN and a base station (gNB) in which both SNs are NRs (NR-NR Dual Connectivity (NN-DC)))).

The wireless communication system 1 may include a base station 11 forming a macrocell C1 having a relatively wide coverage area, and a base station 12(12a to 12C) arranged within the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, and the like of each cell and user terminals 20 are not limited to the illustrated embodiments. Hereinafter, the base stations 11 and 12 are collectively referred to as the base station 10 without distinguishing them.

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

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

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 also be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI)), X2 Interface, or the like) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a Backhaul, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) host, and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The Core Network 30 may include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN)), a Next Generation Core (NGC), and the like, for example.

The user terminal 20 may be a terminal supporting at least one of communication systems such as LTE, LTE-a, and 5G.

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). For example, in at least one of the downlink (dl)) and the 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), or the like may be used.

The radio access method may also be referred to as a waveform (waveform). In the wireless communication system 1, other wireless access schemes (e.g., other single-carrier transmission schemes and other multi-carrier transmission schemes) may be used for the UL and DL wireless access schemes.

As the Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)) Shared by the user terminals 20, a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH)), and the like may be used in the radio communication system 1.

As the Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))), a Random Access Channel (Physical Random Access Channel (PRACH)), and the like, which are Shared by the user terminals 20, may be used in the radio communication system 1.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted over the PUSCH. In addition, a Master Information Block (MIB) may also be transmitted through the PBCH.

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

The DCI scheduling PDSCH may be referred to as DL assignment, DL DCI, etc., and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may be replaced with DL data and the PUSCH may be replaced with UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be used. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). A CORESET may also be associated with one or more search spaces. The UE may also monitor the CORESET associated with a search space based on the search space settings.

One search space may also correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation levels). The one or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be replaced with each other.

Uplink Control Information (UCI)) including at least one of Channel State Information (CSI), ACKnowledgement Information (which may also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, and Scheduling ReQuest (SR)) may also be transmitted through the PUCCH. The random access preamble for establishing a connection with a cell may also be transmitted through the PRACH.

In the present disclosure, a downlink, an uplink, and the like may be expressed without adding a "link". Note that the "Physical (Physical)" may not be added to the beginning of each channel.

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, the DL-RS may be a Cell-specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a DeModulation Reference Signal (DMRS), a Positioning Reference Signal (PRS), a Phase Tracking Reference Signal (PTRS), or the like.

The Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. The signal blocks containing SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH blocks, SS blocks (SSB), and the like. Also, SS, SSB, and the like may also be referred to as reference signals.

In addition, in the wireless communication system 1, a measurement Reference Signal (SRS), a demodulation Reference Signal (DMRS), and the like may be transmitted as an Uplink Reference Signal (UL-RS). In addition, the DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal).

(base station)

Fig. 4 is a diagram illustrating an example of a 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 (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 be provided in one or more numbers.

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

The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation, scheduling (e.g., resource allocation, mapping), etc. of signals. 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 path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmitting/receiving section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

The transceiver 120 may also include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission/reception section 120 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

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

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, the transmission/reception unit 120 (transmission processing unit 1211) may perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like on Data, Control information, and the like acquired from the Control unit 110, and generate a bit string to be transmitted.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

The transmission/reception section 120(RF section 122) may perform modulation, filter processing, amplification, and the like on the baseband signal in 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 section 120(RF section 122) may amplify, filter, demodulate a baseband signal, or the like, with respect to a signal of a radio frequency band received by the transmission/reception antenna 130.

Transmission/reception section 120 (reception processing section 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

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

The transmission path interface 140 may transmit/receive signals (backhaul signaling) to/from devices included in the core network 30 and other base stations 10, and acquire/transmit user data (user plane data) for the user terminal 20, control plane data, and the like.

The transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140.

Further, transmission/reception section 120 may transmit, to user terminal 20, information indicating an application capable of processing time different from the initial transmission of the data (for example, PDSCH or PUSCH) for retransmission of the data, by using higher layer signaling, physical layer signaling, or a combination thereof.

(user terminal)

Fig. 5 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission/reception unit 220, and a transmission/reception antenna 230. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with one or more antennas.

In this example, the functional blocks mainly representing the characteristic portions in the present embodiment are assumed to be included in the user terminal 20, and other functional blocks necessary for wireless communication may be included. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

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

The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmission/reception section 220 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

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

The transmission/reception antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

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

Transmit/receive section 220 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

Transmission/reception section 220 (transmission processing section 2211) may perform processing in the PDCP layer, processing in the RLC layer (e.g., RLC retransmission control), processing in the MAC layer (e.g., HARQ retransmission control), and the like on data, control information, and the like acquired from control section 210, for example, and generate a bit sequence to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

Whether or not the DFT processing is applied may be set based on the transform precoding. When transform precoding is effective (enabled) for a certain channel (e.g., PUSCH), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and when not, may not perform DFT processing as the transmission processing.

The transmission/reception section 220(RF section 222) may perform modulation, filter processing, amplification, and the like on the baseband signal in 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 section 220(RF section 222) may amplify, filter, demodulate a baseband signal, or the like, with respect to a signal of a radio frequency band received by the transmission/reception antenna 230.

Transmission/reception section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal, and acquire user data.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may also 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 transmitting/receiving unit 220 and the transmitting/receiving antenna 230.

Further, control section 210 may determine whether or not the capability of processing time different from the initial transmission of data (for example, PDSCH or PUSCH) is supported for retransmission of the data, and if so, may determine the capability of processing time to be applied to the retransmission.

Transmission/reception section 220 may perform transmission or reception processing based on the determined capability of the processing time to be applied to the retransmission.

Control section 210 may determine that only retransmission to which a capability higher than the capability applied to the initial transmission is applied, or retransmission to which a capability lower than the capability applied to the initial transmission is applied, or both of them are supported.

Control section 210 may determine the capability of the processing time to be applied to the retransmission based on the format of the downlink control information used for scheduling the retransmission.

Control section 210 may also determine the capability of the processing time to be applied to the retransmission based on a control resource set or a search space in which downlink control information for scheduling the retransmission is received.

In the case of an application that does not support the capability of processing time different from the initial transmission, the control unit 210 may also decide that the capability of processing time applied to the retransmission is the same as the capability applied to the initial transmission.

(hardware configuration)

The block diagrams used in the description of the above embodiments represent blocks in functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one physically or logically combined device, or may be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, by wire or wireless) and using these multiple devices. The functional blocks may be implemented by software for one of the above-described apparatuses or a combination of the above-described apparatuses.

Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), assignment (assigning), and the like. For example, a function block (a configuration unit) that functions as a transmission function may be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. All as described above, the implementation method is not particularly limited.

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 6 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 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 addition, in the present disclosure, languages such as a device, a circuit, an apparatus, a section (section), a unit (unit), and the like can be replaced with 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 illustrated devices, or may be configured not to include some of the devices.

For example, only one processor 1001 is illustrated, but there may be multiple processors. The processing may be executed by 1 processor, or may be executed by 2 or more processors simultaneously, sequentially, or by another method. Further, the processor 1001 may be implemented by 1 or more chips.

Each function in the base station 10 and the user terminal 20 is realized by, for example, causing hardware such as the processor 1001 and the memory 1002 to read specific software (program), causing the processor 1001 to perform an operation to control communication via the communication device 1004 or to control at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110(210), the transmitting and receiving unit 120(220), and the like may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with the program and the software module. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 110(210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and may be implemented similarly for other functional blocks.

The Memory 1002 is a computer-readable recording medium, and may be configured by at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), or the like. The memory 1002 can store a program (program code), a software module, and the like that are executable to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be configured by at least one of a flexible disk, a Floppy (registered trademark) disk, an optical disk (for example, a Compact disk ROM (CD-ROM)) or the like), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card (smart card), a flash memory device (for example, a card (card), a stick (stick), a key drive), a magnetic stripe (stripe), a database, a server, and other suitable storage media. The storage 1003 may also be referred to as a secondary storage device.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 may be configured to include, for example, a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD). For example, the transmitting/receiving unit 120(220), the transmitting/receiving antenna 130(230), and the like described above may be implemented by the communication device 1004. The sending and receiving unit 120(220) may also implement physical or logical separation of the sending unit 120a (220a) and the receiving unit 120b (220 b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives 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, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be formed using a single bus, or may be formed using different buses between devices.

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

(modification example)

In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS for short, and may also be referred to as Pilot (Pilot), Pilot Signal, or the like, depending on the applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, the subframe may be configured by one or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

Here, the parameter set (numerology) may also be a communication parameter applied in at least one of transmission and reception of a certain signal or channel. The parameter set (numerology) may indicate, for example, at least one of SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the Time domain, and the like.

The time slot may be formed of one or more symbols in the time domain (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, or the like). Further, the time slot may also be a time unit based on a parameter set.

A timeslot may also contain multiple mini-slots. Each mini-slot may also be made up of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be made up of a fewer number of symbols than a slot. PDSCH (or PUSCH) transmitted in a time unit larger than a mini slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may also use other names corresponding to them, respectively. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be replaced with one another.

For example, 1 subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and 1 slot or 1 mini-slot may also be referred to as a TTI. That is, at least one of the subframe and the TTI may be a subframe (1ms) in the conventional LTE, a period shorter than 1ms (for example, 1 to 13 symbols), or a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, and is not referred to as a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidths, transmission powers, and the like that can be used by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (e.g., the number of symbols) to which a transport block, a code block, a codeword, or the like is actually mapped may also be shorter than the TTI.

In addition, when 1 slot or 1 mini-slot is referred to as TTI, 1 TTI or more (i.e., 1 slot or more or 1 mini-slot) may be the minimum time unit for scheduling. In addition, the number of slots constituting the minimum time unit of the schedule (the number of mini-slots) may also be controlled.

The TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

A 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 (subcarriers) in the frequency domain. The number of subcarriers included in the RB may also be the same regardless of the parameter set (numerology), and may also be 12, for example. The number of subcarriers included in the RB may also be decided based on a parameter set (numerology).

In the time domain, an RB may include one or more symbols, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of 1 TTI and 1 subframe may be configured by one or more resource blocks.

One or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, and the like.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

The Bandwidth Part (BWP) (which may also be referred to as a partial Bandwidth or the like) may also represent a subset of consecutive common RBs (common resource blocks) for a certain parameter set (numerology) in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may also be defined in a certain BWP and are assigned sequence numbers within the BWP.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). For the UE, one or more BWPs may also be set within 1 carrier.

At least one of the set BWPs may be active, and the UE may not expect to transmit or receive a specific signal/channel other than the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced with "BWP".

The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations can be variously changed.

In addition, information, parameters, and the like described in the present disclosure may be expressed by absolute values, may be expressed by relative values with respect to specific values, or may be expressed by other corresponding information. For example, the radio resource may also be indicated by a specific index.

The names used for parameters and the like in the present disclosure are not limitative names in any point. Further, the equations and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus the various names assigned to these various channels and information elements are not limitative names in any way.

Information, signals, and the like described in this disclosure may also be represented using one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer) and from a lower layer to a higher layer. Information, signals, and the like may also be input and output via a plurality of network nodes.

The information, signals, and the like that are input/output may be stored in a specific place (for example, a memory) or may be managed using a management table. The information, signals, and the like to be input and output can be overwritten, updated, or written in addition. The information, signals, etc. that are output may also be deleted. The input information, signal, and the like may be transmitted to another device.

The information notification is not limited to the embodiment described in the present disclosure, and may be performed by other methods. For example, the notification of Information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast Information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling, other signals, or a combination thereof.

In addition, the physical Layer signaling may also be referred to as Layer1/Layer 2(Layer1/Layer2(L1/L2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup (RRC Connection Setup) message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message, or the like. The MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to an explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of other information).

The determination may be performed by a value (0 or 1) expressed by 1 bit, a true-false value (boolean) expressed by true (true) or false (false), or a comparison of numerical values (for example, a comparison with a specific value).

Software shall be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names.

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

The terms "system" and "network" as used in this disclosure are used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight", "Quasi-Co-location (qcl)", "Transmission setting Indication state (TCI state)", "spatial relationship (spatial relationship)", "spatial domain filter", "Transmission power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "enb (enodeb)", "gnb (gnnodeb)", "access Point (access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission/Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. A base station is also sometimes referred to by the terms macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can be provided with a communication service by a base station subsystem (e.g., an indoor small base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of a base station and a base station subsystem that is in communication service within the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE))", "terminal" and the like can be used interchangeably.

A mobile station is also sometimes referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), an unmanned moving body (e.g., an unmanned aerial vehicle, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

In addition, the base station in the present disclosure may also be replaced with a user terminal. For example, the aspects and embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, a Device-to-Device (D2D)), a Vehicle-to-electrical networking (V2X), or the like may be used). In this case, the user terminal 20 may have the functions of the base station 10 described above. The language such as "uplink" or "downlink" may be replaced with a language (e.g., "side") corresponding to inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

Also, the user terminal in the present disclosure may be replaced with 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, it is assumed that the operation performed by the base station is also performed by its upper node (upper node) depending on the case. In a network including one or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, consider a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited thereto), or a combination thereof.

The aspects and embodiments described in the present disclosure may be used alone, may be used in combination, or may be switched and used in conjunction with execution. Note that the order of the processing procedures, sequences, flowcharts, and the like of the respective modes/embodiments described in the present disclosure may be changed as long as there is no contradiction. For example, elements of various steps are presented in an exemplary order for the method described in the present disclosure, and the order is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, fourth generation Mobile communication System (4th generation Mobile communication System (4G)), fifth generation Mobile communication System (4th generation Mobile communication System (5G)), Future Radio Access (FRA), New Radio Access Technology (New-Radio Access Technology (RAT)), New Radio (NR), New Radio Access (NX)), next generation Radio Access (Future Radio Access (FX)), Global Mobile communication System (Global System for Mobile (GSM)), Mobile station (CDMA) and Mobile station (CDMA) SUPER Mobile station (2000B))) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra-wideband (uwb), Bluetooth (registered trademark)), a system using another appropriate wireless communication method, and a next generation system expanded based on these. Further, a combination of a plurality of systems (for example, LTE, or a combination of LTE-a and 5G) may be applied.

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

Any reference to an element using the designations "first," "second," etc. used in this disclosure is not intended to be a comprehensive limitation on the quantity or order of such elements. These designations can be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not imply that only two elements can be used or that in some form the first element must precede the second element.

The term "determining" used in the present disclosure sometimes includes various operations. For example, "determination (decision)" may be regarded as a case where "determination (decision)" is performed on determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search (search), query (inquiry)) (for example, search in a table, a database, or another data structure), confirmation (authenticating), and the like.

The "determination (decision)" may be regarded as a case of "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like.

The "determination (decision)" may be regarded as "determination (decision)" performed for solving (resolving), selecting (selecting), selecting (breathing), establishing (evaluating), comparing (comparing), and the like. That is, "judgment (decision)" may also be regarded as "judgment (decision)" performed on some operation.

The "determination (decision)" may be replaced with "assumption (associating)", "expectation (expecting)", "consideration (associating)", or the like.

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

The term "connected" or "coupled" or any variant thereof used in the present disclosure means any connection or coupling, directly or indirectly, between 2 or more elements, and can include a case where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "accessed".

In the present disclosure, in the case of connecting two elements, it can be considered that more than one electric wire, cable, printed electric connection, or the like is "connected" or "combined" to each other, and as some non-limiting (non-limiting) and non-inclusive (non-inclusive) examples, electromagnetic energy having a wavelength of a radio frequency domain, a microwave domain, a light (visible light and invisible light) domain, or the like is used to be "connected" or "combined" to each other.

In the present disclosure, the term "a is different from B" may also mean "a and B are different from each other". In addition, the term may also mean "a and B are different from C, respectively". The terms "separate", "associated", and the like are also to be construed as the same as "different".

When the terms "include", "including", and "including" and their variants are used in the present disclosure, these terms are intended to be inclusive in the same way as the term "comprising". Further, the term "or" as used in this disclosure means not exclusive or.

In the present disclosure, where articles are added by translation, for example, as in the english language a, an, and the, the present disclosure may also include nouns that follow these articles in plural forms.

While the invention according to the present disclosure has been described in detail, it will be apparent 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 a modification and a variation without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes, and the invention according to the present disclosure is not intended to be limited thereto.

Claims (6)

1. A terminal, characterized by having:

a control unit for determining whether or not an application having a capability of processing time different from that of initial transmission of data is supported for retransmission of the data, and if supported, determining the capability of processing time to be applied to the retransmission; and

and a transmission/reception unit that performs transmission or reception processing based on the determined capability of the processing time applied to the retransmission.

2. The terminal of claim 1,

the control unit determines that only retransmission to which a capability higher than a capability applied to the initial transmission is applied or retransmission to which a capability lower than the capability applied to the initial transmission is applied is supported.

3. The terminal according to claim 1 or claim 2,

the control unit determines a capability of a processing time to be applied to the retransmission based on a format of downlink control information for scheduling the retransmission.

4. The terminal according to claim 1 or claim 2,

the control unit decides a capability of a processing time applied to the retransmission based on a control resource set or a search space in which downlink control information for scheduling the retransmission is received.

5. The terminal according to any of claims 1 to 4,

in the case of an application that does not support the capability of processing time different from the initial transmission, the control unit decides that the capability of processing time applied to the retransmission is the same as the capability applied to the initial transmission.

6. A wireless communication method for a terminal, the wireless communication method comprising:

determining whether or not an application of a capability of a processing time different from the initial transmission of the data is supported for retransmission of the data, and if the application of the capability of the processing time for the retransmission is supported, determining the capability of the processing time for the retransmission; and

and performing a process of transmission or reception based on the determined capability of the processing time applied to the retransmission.

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