WO2020202443A1

WO2020202443A1 - User terminal and wireless communication method

Info

Publication number: WO2020202443A1
Application number: PCT/JP2019/014523
Authority: WO
Inventors: 一樹武田; 優元 ▲高▼橋; 聡永田; リフェワン; シャオホンジャン; ギョウリンコウ
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2019-04-01
Filing date: 2019-04-01
Publication date: 2020-10-08

Abstract

A user terminal according to an aspect of the present disclosure is characterized by comprising: a reception unit that receives information related to a set of Modulation and Coding Scheme (MCS) indexes; and a control unit that controls transmission based on a value of an MCS field included in downlink control information in accordance with correspondence indicated by a table obtained by extracting entries corresponding to the set of MCS indexes out of a predetermined MCS table. According to an aspect of the present disclosure, URLLC communication can be implemented in a suitable manner.

Description

User terminal and wireless communication method

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

In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of further high-speed data rate, low latency, etc. (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, NR), further advancement of mobile broadband (eMBB: enhanced Mobile Broadband), machine type communication (mMTC: massive Machine Type Communications) that realizes multiple simultaneous connections, highly reliable and low latency communication Use cases such as (URLLC: Ultra-Reliable and Low-Latency Communications) are envisioned.

Similar to eMBB, URLLC is also under consideration for scheduling and triggering reference signals based on downlink control information (DCI).

However, how to configure the contents or format of DCI for URLLC has not been studied yet. If the DCI for URLLC is not clearly determined, appropriate URLLC communication cannot be performed, and the communication throughput may decrease.

Therefore, one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method capable of preferably performing URLLC communication.

The user terminal according to one aspect of the present disclosure corresponds to a receiver that receives information about a set of Modulation and Coding Scheme (MCS) indexes and the set of MCS indexes from a predetermined MCS table. It is characterized by having a control unit that controls transmission based on the value of the MCS field included in the downlink control information according to the correspondence shown by the table from which the entries are extracted.

According to one aspect of the present disclosure, URLLC communication can be preferably performed.

FIG. 1 is a diagram showing an example of the configuration of DCI formats 0_0 and 0_2. FIG. 2 is a diagram showing an example of the configuration of DCI formats 1_0 and 1_2. FIG. 3 is a diagram showing an example of a 5-bit MCS table for PDSCH. FIG. 4 is a diagram showing an example of a 4-bit MCS table for PDSCH. FIG. 5 is a diagram showing an example of a table in which M indexes are picked up. FIG. 6 is a diagram showing another example of a table in which M indexes are picked up. FIG. 7 is a diagram showing still another example of a table in which M indexes are picked up. FIG. 8 is a diagram showing another example of a 4-bit MCS table for PDSCH. 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 the base station according to the 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.

In future wireless communication systems (for example, NR), further advancement of mobile broadband (eMBB: enhanced Mobile Broadband), machine type communication (mMTC: massive Machine Type Communications) that realizes multiple simultaneous connections, highly reliable and low latency communication Use cases such as (URLLC: Ultra-Reliable and Low-Latency Communications) are envisioned. For example, URLLC requires greater delay reduction and higher reliability than eMBB.

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

For example, the eMBB 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. The reliability requirement of URLLC may also include a 32-byte error rate of ^10-5 at a U-plane delay of 1 ms.

It is required that a plurality of UEs (for example, meMBB UE and URLLC UE) targeting different requests are multiplexed in a certain carrier (or cell). When one UE supports both eMBB and URLLC, the UE needs to be treated as both eMBB UE and URLLC UE at the same time.

Therefore, the present inventors have conceived the structure of the DCI content or format for URLLC.

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

Note that the URLLC of the present disclosure may be read by the first communication service, and the eMBB may be read by the second communication service.

(Wireless communication method)
<First Embodiment>
The first embodiment relates to a specific DCI for PDSCH (Physical Downlink Shared Channel) reception or PUSCH (Physical Uplink Shared Channel) transmission for URLLC.

In the present disclosure, for the sake of simplicity, the DCI that schedules PUSCH for URLLC is referred to as DCI format 0_2, UL DCI for URLLC, etc., and the DCI that schedules PDSCH for URLLC is referred to as DCI format 1-2, DL DCI for URLLC, etc. Call. The name is not limited to this.

In the present disclosure, "DCI for URLLC" may be read as one or both of DCI formats 0_2 and 1_2, DCI format for URLLC, and the like. Further, "one or both of DCI formats X and Y" may be expressed as DCI formats X / Y.

The monitor of DCI format 0_2 / 1-2 may be set in the UE by the RRC information element (for example, "SearchSpace IE"). The UE may monitor DCI format 0_1 / 1-2 as well as other DCI formats (eg DCI format 0_1 / 1-1) if configured.

When monitoring DCI format 0_2 / 1-2, the UE may monitor DCI format 0_0 / 1_0 for at least one such as system information, paging, random access, and the like.

The size of DCI format 0_2 / 1-2 may be adjusted to be the same as the size of DCI format 0_0 / 1_0.

The DCI format 0_2 / 1-2 may have a different field from the DCI format 0_0 / 1_0, or may have the same field. The size of the field of the DCI format 0_2 / 1-2 may be different from the size of the same field included in the DCI format 0_0 / 1_0.

When the size of DCI format 0_2 / 1-2 is smaller than the size of DCI format 0_0 / 1_0, a predetermined bit (for example, '0') is padded in DCI format 0_2 / 1-2 and adjusted to the same size as DCI format 0_0 / 1_0. May be done.

DCI format 0_2 / 1-2 may have one or more fields added for more flexible control than DCI format 0_0 / 1_0, and one or more fields may be deleted or reduced to match the payload size. May be done.

The DCI format 0_2 / 1-2 may have a different field configuration from the DCI format 0_0 / 1_0, or the total payload size may be adjusted to be the same by using padding bits.

Further, the size of DCI format 0_1 / 1-2 may be adjusted to be the same as the size of DCI format 0_1 / 1-1_1. In the description of the sizes, fields, etc. of the DCI format 0_2 / 1_2 and the DCI format 0_0 / 1_0 described above, the DCI format 0_0 / 1_0 may be replaced with the DCI format 0_1 / 1-1.

The DCI format 0_2 / 1-2 may be monitored in a specific search space set. For example, the DCI format 0_2 / 1-2 may be monitored in at least one of the UE-specific search space set and the common search space set.

A case where the DCI format 0_2 / 1-2 monitored in the UE-specific search space set is adjusted to the same size as the DCI formats 0_0 and 1_0 will be described with reference to FIGS. 1 and 2.

FIG. 1 is a diagram showing an example of the configuration of DCI formats 0_0 and 0_2. In this example, the number of bits of the field included in the payload of DCI format 0_0 and 0_2 and the remarks about the payload of DCI format 0_2 are shown. The name of each field is not limited to the name shown in the figure.

The identifier field is a field indicating whether DCI is for DL or UL. The identifier field may be included in both DCI formats 0_0 and 0_2. The identifier field may be indicated by 1 bit.

The Identifier2 field is a field indicating whether DCI is for eMBB or URLLC (or DCI format 0_0 or 0_2). The identifier 2 field may not be included in any of DCI formats 0_0 and 0_2, or may be included in at least one of DCI formats 0_0 or 0_2. The identifier 2 field may be indicated by 1 bit.

The size of the identifier and the identifier 2 field is not limited to 1 bit. Further, for example, a 2-bit identifier field that summarizes these fields may be specified. In this case, the identifier field can be used to identify more than two DCI formats.

The frequency domain allocation field (which may also be called the frequency domain resource allocation field) has the number of bits of the following formula 1 in DCI format 0_0 and the number of bits of formula 2 below in DCI format 0_2. May be shown.

Here, N ^BWP may indicate the size (bandwidth, number of resource blocks) of the active UL BWP or DL BWP, and x may indicate one unit of type 1 resource allocation (number of consecutive resource blocks). Since URLLC is expected to use a wide bandwidth, type 1 resource allocation is preferable. In addition, another resource allocation method may be used for URLLC.

Note that x may be associated with at least one of the BWP and the transmission period (for example, transmission time interval (TTI: Transmission Time Interval), slot, etc.) and set by higher layer signaling, or is specified by the specification. May be good. That is, x in Equation 2 may take a different value for at least one of the BWP and the transmission period.

Fields included in DCI format 0_0 (for example, 4-bit Time-domain assignment field, 1-bit frequency hopping flag field, 5-bit MCS (Modulation and Coding Scheme) field, 1-bit NDI (New Data Indicator) field, 2-bit RV (Redundancy Version) field, 4-bit HPN (HARQ Process Number) field, 2-bit TPC (Transmit Power Control) command field, 0 or 1-bit UL When the / SUL indicator (Uplink / Supplementary Uplink indicator field) is included in DCI format 0_2, the field may be configurable or fixed by specification.

When the field included in DCI format 0_0 is included in DCI format 0_2, the size of the field in DCI format 0_2 is preferably less than or equal to the size of the field in DCI format 0_0.

In FIG. 1, the time domain allocation field of DCI format 0_2 is set or specified to 4 bits or less, the frequency hopping flag field is set to 1 bit or less, the MCS field is set to 5 bits or less, the RV field is set to 2 bits or less, and the HPN field is set to 4 bits or less. May be done.

Fields not included in DCI format 0_0 (for example, repetition factor field, CSI (Channel State Information) request field, SRS (Sounding Reference Signal) request field, SRS resource indicator field, beta offset field, DMRS related field If (for example, parameters related to DMRS pattern, cyclic shift (CS: Cyclic Shift), application of IFDMA (Interleaved Frequency Division Multiple Access), etc.) are included in DCI format 0_2, the field may be configurable. However, it may be fixed according to the specifications (Fig. 1 shows a case that can be set).

The DCI formats 0_0 and 0_2 may include padding bits, if necessary. The padding bits included in the DCI format 0_0 may be the number of bits for matching the sizes of the DCI format 1_0 and the DCI format 0_0.

The padding bit included in the DCI format 0_2 may be the number of bits for matching the sizes of the DCI format 1_0 (or 0_0) and the DCI format 0_2. The UE may assume that the payload size of DCI format 0_2 is less than or equal to the payload size of DCI format 1_0, excluding the putting bits.

FIG. 2 is a diagram showing an example of the configuration of DCI formats 1_0 and 1_2. In this example, the number of bits of the field contained in the payload of DCI format 1_0 and 1_2 and the remarks about the payload of DCI format 1_2 are shown. The name of each field is not limited to the name shown in the figure.

The fields appearing in FIG. 1, such as the identifier field, the identifier 2 field, and the MCS field, correspond to the contents in which DCI formats 0_0 and 0_2 are replaced with DCI formats 1_0 and 1_2 in the explanation of FIG. Do not repeat.

Fields included in DCI format 1_0 (for example, 1-bit VRB-to-PRB mapping field, 2-bit DAI (Downlink Assignment Index) field, 3-bit PUCCH resource indicator field, 3-bit HARQ When a timing indicator (HARQ timing indicator field) is included in the DCI format 1-2, the field may be configurable or fixed according to the specifications.

When the field included in DCI format 1_0 is included in DCI format 1-2, the size of the field is preferably smaller than or equal to the size of the field in DCI format 1_2.

Fields not included in DCI format 1_0 (for example, rate-matching indicator field (for example, parameters related to RMR (Rate-Matching Resource), zero power (ZP: Zero Power) CSI-RS, etc.), TCI When a state (Transmission Configuration Indication state) field is included in DCI format 1-2, the field may be configurable or fixed by specification (FIG. 2 shows a case where it can be configured). ).

The DCI format 1-2 may include padding bits as needed. The padding bits included in the DCI format 1_2 may be the number of bits for matching the sizes of the DCI format 1_0 (or 0_0) and the DCI format 1_2. The UE may assume that the payload size of DCI format 1_2 is less than or equal to the payload size of DCI format 1_0, excluding the putting bits.

The padding bits in the DCI format 0_2 / 1-2 may be all '0', all '1', a specific pattern, or the like. The padding bits in the DCI format 0_2 / 1-2 may be scrambled by a predetermined parameter (for example, UE identifier (UE-ID), RNTI (Radio Network Temporary Identifier)).

The padding bit in the DCI format 0_2 / 1-2 may be used as a virtual cyclic redundancy check (V-CRC: Virtual Cyclic Redundancy Check) bit for reducing the false alarm probability. The V-CRC bit corresponds to a known bit value included in the transmitted payload, and may be called a bit for pruning or the like. In general, the effect of error correction can be improved as the known bit value increases.

If the size of a field with DCI format 0_2 / 1-2 (eg, RV, HPN, MCS, etc.) is reduced compared to the size of the field with DCI format 0_0 / 1_0, it is based on any of the following or a combination thereof: The value of the field in DCI format 0_2 / 1-2 may be determined (or interpreted).
(1) The correspondence (table) between the value of the field and the corresponding parameter is defined for each size of the field, and the table to be referenced is changed according to the size of the received field.
(2) It is assumed that the most significant bit (MSB: Most Significant Bit) or the least significant bit (LSB: Least Significant Bit) before reduction is a specific bit value (for example, '0' or '1'). ,
(3) Use a table in which the correspondence (table) between the value of the field and the corresponding parameter is modified.

Regarding (2) above, a specific bit value may be used as a V-CRC bit.

For example, when the MCS field is reduced, it may mean that the MCS table is defined for each MCS field size in the above (1). For example, a first MCS table containing 32 entries corresponding to an MCS field size of 5 bits, a second MCS table containing 16 entries corresponding to an MCS field size of 4 bits, and an MCS field size of 3 bits. A third MCS table, etc., containing eight entries corresponding to may be defined.

Further, when the MCS field is reduced, regarding the above (2), if the size of the MCS field of DCI format 0_2 / 1-2 is 4 bits, the UE interprets that the most significant bit is '0'. However, the MCS index 0-15 corresponding to the value of the MCS field may be referred to in the 5-bit MCS table.

FIG. 3 is a diagram showing an example of a 5-bit MCS table for PDSCH. The table is a table that associates MCS index _{I MCS,} modulation order _{Q m,} coding rate (target code rate) and the spectral efficiency. The values shown in the MCS table in the present disclosure are merely examples, and are not limited thereto. Also, some items associated with the MCS index (eg, spectral efficiency) may be omitted or other items may be added.

The MCS table in FIG. 3 may be an MCS table for URLLC that is distinguished from the MCS table for eMBB, and may be called an MCS table 3 or the like.

In the MCS table of FIG. 3, MCS index = 29-31 may correspond to non-adaptive retransmission. The non-adaptive retransmission may be a retransmission using the same transmission parameters as the transmission parameters for the initial transmission. The transmission parameter may include, for example, at least one of modulation scheme, modulation order, code rate, spectral efficiency, subcarrier spacing, radio resources, and the like. For this reason, entries that fall under non-adaptive retransmissions may have at least one element (code rate and spectral efficiency in FIG. 3) represented as "reserved". For example, an entry corresponding to non-adaptive retransmission may have an element other than the modulation order corresponding to "reserved". An entry containing a "reserved" element may be referred to as a "reserved" entry.

The MCS index corresponding to non-adaptive retransmission is not limited to 29-31, and may be, for example, 28-31.

When the MCS field is reduced, for (3) above, if the size of the MCS field of DCI format 0_2 / 1-2 is 4 bits, the UE makes an entry corresponding to non-adaptive retransmission of the 5-bit MCS table. You may shift to the entry corresponding to the MCS index from the highest available 4-bit value.

FIG. 4 is a diagram showing an example of a 4-bit MCS table for PDSCH. The MCS table of FIG. 4 corresponds to a table in which the entry corresponding to the MCS index = 29-31 of the MCS table of FIG. 3 is replaced with the entry of the MCS index = 13-15, and the MCS index 0-15 is extracted.

Making a decision regarding a specific field of DCI format 0_2 / 1-2 based on any of the above (1)-(3) or a combination thereof may be set in the UE by upper layer signaling.

According to the first embodiment described above, the UE can appropriately monitor the DCI for URLLC and can suitably control the transmission / reception processing based on the DCI.

[Modified example of the first embodiment]
A modified example of the configuration for reducing the MCS field according to the above (3) will be further described.

The size of the MCS field may be represented by ceil (log ₂ M). Here, ceil (x) is a ceiling function of x. In this case, the UE may be notified of a set of M MCS indexes (which may be referred to as an MCS index set) using higher layer signaling (eg, RRC signaling, MAC signaling). The UE may refer to a table obtained by extracting (picking up) entries corresponding to the M indexes from a predetermined MCS table as a modification table corresponding to the reduced MCS field.

A UE with an MCS index set may assume that each code point in the MCS field of a given DCI corresponds to one of the entries in the MCS index set.

FIG. 5 is a diagram showing an example of a table in which M indexes are picked up. The table on the left side of FIG. 5 corresponds to the MCS table 3 corresponding to the same 5-bit MCS index as in FIG.

For example, when the UE sets {0, 2, 5, 6}, which is a set of M = 4 indexes, as the MCS index set by upper layer signaling, the entries corresponding to these indexes in the MCS table 3 , And a table consisting of entries in which each index is replaced with {0, 1, 2, 3} may be determined to be the above-mentioned modification table. The modification table will correspond to a 2-bit MCS index.

Here, an example is shown in which only the original index (in other words, the index value of one table) is specified by the upper layer signaling, but the present invention is not limited to this. For example, the correspondence between the original index and the index in the modification table may be specified.

For example, the UE has {(0, 1,), (2, 3), (5, 0), (6, 2)} set by higher layer signaling as a set of M = 4 corresponding relationships. In this case, the table consisting of the entries corresponding to the indexes {0, 2, 5, 6} of the MCS table 3 and the respective indexes replaced with {1, 3, 0, 2} is referred to as the above-mentioned modification table. You may decide. The modification table may be rearranged in ascending order of index.

Note that the MCS table entry (or MCS index) may be associated with the presence or absence of a transform precoder (which may be referred to as valid or invalid). For example, with respect to the above-mentioned M pickup tables, M1 entries may be set as entries with a transform precoder, and M2 entries may be set as entries without a transform precoder. However, M1 + M2 = M.

That is, the presence or absence of the transform precoder applied to UL transmission (PUSCH) may be specified by the MCS index. With the existing Rel-15 NR, the presence or absence of a transform precoder could only be set quasi-statically by RRC signaling, but by using such an association with the MCS index, the presence or absence of a transform precoder can be set. Can be dynamically instructed.

The UE may apply DFT-s-OFDM (Discrete Fourier Transform Spread OFDM) for transmission with a transform precoder, and CP-OFDM (Cyclic) for transmission without a transform precoder. Prefix OFDM) may be applied.

FIG. 6 is a diagram showing another example of a table in which M indexes are picked up. This example corresponds to the above-mentioned M1 = 6, M2 = 2, and M = 8. The entry of the MCS index 0-6 in the table of FIG. 6 is a pick-up of the entry of the MCS index 0-6 in the MCS table of FIG. 3, and corresponds to the transform precoder (enabled). ..

Further, the entry of the MCS index 7-8 in the table of FIG. 6 is the entry of the MCS index 0-1 of the MCS table of FIG. 3 picked up, and without the transform precoder (disabled). Applicable. As shown in this example, the entries corresponding to the same MCS index in the original MCS table may be specified for the entries with and without the transform precoder, respectively.

Note that FIGS. 5 and 6 show an example in which the Q _{m of the} entries to be picked up is all 2, but the present invention is not limited to this, and for example, entries corresponding to a plurality of Q _m values are set to be picked up. You may.

The reduced MCS table may consist only of entries that are not for "reservation" as shown in FIGS. 5 and 6, or may include entries for "reservation". That is, the above-mentioned M may correspond to the sum of M'and the number of entries for "reservation". Here, M'may correspond to the number of entries not for "reservation".

If at least one entry corresponding to a certain Q _m is included in the M'entries, the entry for "reservation" corresponding to the Q _m is added after the M'entries. May be added. That is, when the M'entries include an entry corresponding to the first Q _m (for example, Q _m = 2) and an entry corresponding to the second Q _m (for example, Q _m = 4). May be followed by an entry for "reservation" corresponding to the first Q _m and an entry for "reservation" corresponding to the second Q _m .

When the UE sets a set of M'indexes as the MCS index set by higher layer signaling, the UE indicates one or more entries of the set M'indexes after the corresponding entries. It may be assumed that the reference is made to a table to which an entry for "reservation" corresponding to Q _m of is added. In other words, the UE may refer to the reduced MCS table containing the entry for "reservation" without setting the index corresponding to the entry for "reservation" as the MCS index set.

FIG. 7 is a diagram showing still another example of a table in which M indexes are picked up. This example corresponds to the above-mentioned M'= 6. The entry of the MCS index 0-5 in the table of FIG. 7 is the entry of the MCS index 0-5 of the MCS table of FIG. 3 picked up. The entry of the MCS index 6 in the table of FIG. 7 is the entry of the MCS index 15 of the MCS table of FIG.

Since the M'entries include an entry corresponding to Q _m = 2 and an entry corresponding to Q _m = 4, the UE corresponds to Q _m = 2 after the M'entries. It may be assumed that the MCS table shown in FIG. 7 is added with an entry for "reservation" and an entry for "reservation" corresponding to Q _m = 4. A predetermined number of M (8 in the case of FIG. 7) may or may not be set in the UE (in this case, only M = 8 is obtained as a result).

Note that FIG. 4 shows an example in which all three entries (entries corresponding to MCS index = 29-31) for "reservation" in the MCS table of FIG. 3 are maintained, but the present invention is not limited to this.

For example, if the MCS field is reduced, the "reserved" entries contained in the reduced table may be limited to those equal to the Q _m value of the non-reserved entries contained in the table. ..

FIG. 8 is a diagram showing another example of a 4-bit MCS table for PDSCH. The MCS table of FIG. 6 corresponds to a table in which the entry corresponding to the MCS index = 29 of the MCS table of FIG. 3 is replaced with the entry of the MCS index = 15 and the MCS index 0-15 is extracted. Unlike the MCS table of FIG. 4, the MCS table of FIG. 6 has a configuration including only entries of Q _m = 2.

Further, when constructing a reduced MCS table including only the entries of Q _m = 2 corresponding to the 3-bit MCS field, the entry corresponding to the MCS index = 29 of the MCS table of FIG. 3 is the MCS index = 7 A table or the like from which the MCS index 0-7 is extracted may be used instead of the entry of. That is, in the reduced MCS table, only the maximum value of the MCS index is an entry for "reservation", and the Q _m value of each entry may be equal. By constructing the table in this way, it is possible to reduce unnecessary MCS entries while reducing the size of the MCS field.

According to the modification of the first embodiment described above, the reduced MCS table can be flexibly configured.

<Second embodiment>
The second embodiment relates to the distinction between the contents or formats of the DCI for eMBB and the DCI for URLLC. The second embodiment may be applied at the same time as the DCI format configuration (size adjustment, etc.) described in the first embodiment.

DCI for eMBB (or DCI format) and DCI for URLLC (or DCI format) may be distinguished based on any of the following (A)-(D) or a combination thereof:
(A) Search space setting, CORESET (COntrol REsource SET) setting or PDCCH (Physical Downlink Control Channel) monitoring period (PDCCH monitoring occasion),
(B) Aggregation level corresponding to DCI,
(C) RNTI, which scrambles the CRC contained in DCI,
(D) A specific field of DCI.

Regarding (B) above, the UE is, for example, a DCI for eMBB if the aggregation level corresponds to a set of first values (for example, 1, 2 or 4) in a certain CORESET / search space set, and the aggregation. If the level is a DCI corresponding to a second set of values (eg, 8 or 16), it may be determined to be a DCI for URLLC.

Regarding (C) above, the UE may determine that if the CRC of the DCI is scrambled by the RNTI for URLLC, the DCI is the DCI for URLLC, otherwise it is the DCI for eMBB.

Regarding (D) above, for example, the identifier 2 field described above in FIGS. 1 and 2 may be used.

Based on the above (A)-(C), for example, if the PDCCH monitoring period is at a specific position in the slot, the UE may determine that the DCI received during that period is the URLLC DCI. Further, when the PDCCH monitoring period is located at the beginning of the slot, the UE may use the above (B) or (C) to determine whether or not the DCI is for URLLC.

Further, the UE determines the DCI based on the above (C) for the first search space set (for example, the UE-specific search space set), and determines the DCI for the second search space set (for example, the common search space set). The DCI may be determined based on the above (B).

According to the second embodiment described above, the UE can appropriately distinguish between the DCI for eMBB and the DCI for URLLC.

<Others>
In the first embodiment described above, it is assumed that the size of DCI format 0_2 and the size of DCI format 1-22 are adjusted to be the same, but the size is not limited to this. The size of DCI format 0_2 and the size of DCI format 1-2 may be different.

For example, the size of DCI format 0_2 may be adjusted to the same size as DCI formats 0_0 and 1_1, and the size of DCI format 1_2 may be adjusted to the same size as DCI formats 0_1 and 1_1. Conversely, the size of DCI format 1_2 may be adjusted to the same size as DCI formats 0_0 and 1_0, and the size of DCI format 0_2 may be adjusted to the same size as DCI formats 0_1 and 1_1.

Further, in the second embodiment, the size of the DCI for eMBB and the size of the DCI for URLLC may be the same or different.

Note that the control using the table in the present disclosure may be performed by using a function or the like that satisfies the correspondence shown in the table. The UE uses a function that satisfies the correspondence shown by the table that extracts the entries corresponding to the set of MCS indexes from the predetermined MCS table, for example, and the transmission parameters related to the MCS. (Modulation order, coding rate, etc.) may be derived. The table of the present disclosure (for example, the MCS table and the table from which the entries corresponding to the MCS index set are extracted) may be read as an information group, an information set, or the like.

Further, the method of reducing the DCI format field (such as setting the MCS index set) in the present disclosure is not limited to the application to DCI for URLLC. For example, the method of reducing fields in a DCI format in the present disclosure may be applied even if the DCI format is not adjusted to the same size as other DCI formats.

(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 between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC is a dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), and a dual connectivity between NR and LTE (NR-E). -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 NR base station (gNB) is MN, and the LTE (E-UTRA) base station (eNB) 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 macro cell C1 having a relatively wide coverage, and a base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell 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 the 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 macro cell 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 FR2 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 host 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, downlink shared channels (Physical Downlink Shared Channel (PDSCH)), broadcast channels (Physical Broadcast Channel (PBCH)), and downlink control channels (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. In addition, Master Information Block (MIB) may be transmitted by 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, etc., and the DCI that schedules PUSCH may be called UL grant, UL DCI, etc. 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 to detect the PDCCH. 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 ( Uplink Control Information (UCI) including at least one of SR)) may be transmitted. The PRACH may transmit a random access preamble for establishing a connection with the cell.

In this disclosure, downlinks, uplinks, etc. may be expressed without "links". Further, it may be expressed without adding "Physical" at 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 demodulation reference signal (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 the base station according to the 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.

Note that, in this example, the functional blocks of the feature portion in the present embodiment are 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, state 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 transmission / reception unit 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which are described based on common recognition in the technical fields 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 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, the Packet Data Convergence Protocol (PDCP) layer and the Radio Link Control (RLC) layer for data, control information, etc. acquired from the control unit 110 (for example,). 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. The base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog transform, and other transmission processing.

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) on the acquired baseband signal. )) Processing (if necessary), filtering, demapping, demodulating, 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 measuring 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 and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.

The transmitting unit and the receiving 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 line interface 140.

The transmission / reception unit 120 includes a first DCI (for example, DCI format 0_2 / 1-2) for the first communication service (for example, URLLC) and a second DCI (for example, eMBB) for the second communication service (for example, eMBB). For example, at least one of DCI format 0_0 / 1_0 or DCI format 0_1 / 1-1) may be transmitted to the user terminal 20.

The control unit 110 may adjust the size of the first DCI to be the same as that of the second DCI.

Further, the transmission / reception unit 120 may transmit information regarding a set of modulation and coding Scheme (MCS) indexes to the user terminal 20.

(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.

Note that this example mainly shows the functional blocks of the feature portion in the present embodiment, 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 and 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 transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception 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 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) performs 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, 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 to output the baseband signal.

Whether or not to apply the DFT process may be based on the transform precoding setting. The transmission / reception unit 220 (transmission processing unit 2211) described above for transmitting a channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled. 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. to the radio frequency band on the baseband signal, 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 transmitter and receiver of the user terminal 20 in the present disclosure may be composed of at least one of the transmitter / receiver 220 and the transmitter / receiver antenna 230.

The transmission / reception unit 220 includes a first DCI (for example, DCI format 0_2 / 1-2) for the first communication service (for example, URLLC) and a second DCI (for example, eMBB) for the second communication service (for example, eMBB). For example, at least one of DCI format 0_0 / 1_0 or DCI format 0_1 / 1-1) may be received.

The control unit 210 assumes that the first DCI is adjusted to have the same size as the second DCI (for example, is padded), and performs processing based on the first DCI (for example, padding). For example, PDSCH reception, PUSCH transmission, etc.) may be controlled.

When the field included in the second DCI is included in the first DCI, the control unit 210 has a size of the field of the first DCI equal to or smaller than the size of the field of the second DCI. You may assume that.

When the size of a predetermined field (for example, MCS field) of the first DCI is reduced compared to the size of the field of the second DCI, the control unit 210 determines the size of the field for each size of the field. A table showing the values of the fields and the corresponding parameters (for example, the MCS table) is specified, and the table to be referred to may be changed according to the size of the predetermined field included in the first DCI received.

When the size of the predetermined field of the first DCI is reduced compared to the size of the field of the second DCI, the control unit 210 has the most significant bit or the least significant bit of the value of the predetermined field. May be assumed to be a particular bit value (eg, '0').

When the size of the predetermined field of the first DCI is reduced compared to the size of the field of the second DCI, the control unit 210 sets the value of the field used for the second DCI. A table in which a particular (eg, non-adaptive retransmission) entry contained in a table showing the corresponding parameters is shifted to an entry corresponding to a value available for the size of the given field of the first DCI. You may refer to it.

Further, the transmission / reception unit 220 may receive information regarding a set of modulation and coding Scheme (MCS) indexes.

The control unit 210 follows (or or) the correspondence shown by the table in which the entries corresponding to the set of MCS indexes are extracted from the predetermined MCS table (for example, the MCS table corresponding to the MCS field having a fixed number of bits (5 bits)). (Refer to the correspondence), transmission based on the value of the MCS field included in the downlink control information (DCI) (for example, PUSCH transmission) may be controlled.

The control unit 210 may determine whether or not there is a transform precoder to be applied to transmission based on the value of the MCS field.

The control unit 210 determines that the extracted table is a table in which an entry corresponding to the set of MCS indexes is followed by a reservation entry corresponding to one or more modulation orders indicated by the entry. You may assume.

(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 by using one device that is physically or logically connected, or directly or indirectly (for example, by using two or more physically or logically separated devices). , 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 (constituent unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like. As described above, the method of realizing each of them is not particularly limited.

For example, the base station, user terminal, etc. 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 of 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.

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, registers, 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, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disk, etc.). At least one of Blu-ray® disks, removable disks, hard disk drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. 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 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). It 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 from 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 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, 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 can also be abbreviated as RS, and may be called a pilot, a pilot signal, or the like depending on the applied standard. Further, the component carrier (Component Carrier (CC)) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

The wireless frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless 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 includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and 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 (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. Further, the slot may be a time unit based on numerology.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called a sub slot. A minislot may consist of a smaller number of symbols than the slot. A PDSCH (or PUSCH) transmitted in a time unit larger than the minislot may be referred to as a 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 have 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. It 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.

The 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. TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

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

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, etc.) represents a subset of consecutive common resource blocks (RBs) for a numerology in a carrier. May be good. Here, the common RB may be specified by an 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 wireless frame, the number of slots per subframe or wireless frame, 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 the 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, radio resources 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 explicitly disclosed in this 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 may be voltage, current, 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 another device.

Notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using other methods. 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.

Note that 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 called 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. 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 is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be broadly interpreted to mean.

In addition, 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. "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 the present disclosure, "base station (BS)", "radio 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 can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells. 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 part or all of the coverage area of at least one of the base stations and base station subsystems that provide 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, the 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, communication between a base station and a user terminal has been replaced with 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. In addition, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the uplink, downlink, and the like may be read as side channels.

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 performed by the base station and 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 switched with 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), 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), IEEE 802.11 (Wi-Fi (registered trademark)), LTE 802.16 (WiMAX (registered trademark)), LTE 802. 20, Ultra-WideBand (UWB), Bluetooth®, other systems that utilize suitable wireless communication methods, next-generation systems extended based on these, and the like. In addition, a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

The phrase "based on" as 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", "second", etc. 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".

In addition, "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 "judgment (decision)" such as "accessing" (for example, accessing data in memory).

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

In addition, "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 this 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 "joined" 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, using one or more wires, cables, printed electrical connections, etc., 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 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 comprehensive as the term "comprising". Is intended. Furthermore, the term "or" used in the present disclosure is intended not to be an exclusive OR.

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

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 a modified 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 information about a set of Modulation and Coding Scheme (MCS) indexes, and
It is characterized by having a control unit that controls transmission based on the value of the MCS field included in the downlink control information according to the correspondence shown by the table that extracts the entries corresponding to the set of MCS indexes from the predetermined MCS table. User terminal to do.
The user terminal according to claim 1, wherein the control unit determines the presence or absence of a transform precoder applied to transmission based on the value of the MCS field.
The control unit determines that the extracted table is a table in which an entry corresponding to the set of MCS indexes is followed by a reservation entry corresponding to one or more modulation orders indicated by the entry. The user terminal according to claim 1 or 2, characterized in that it is assumed.
Steps to receive information about a set of Modulation and Coding Scheme (MCS) indexes, and
It is characterized by having a step of controlling transmission based on the value of the MCS field included in the downlink control information according to the correspondence shown by the table in which the entry corresponding to the set of MCS indexes is extracted from the predetermined MCS table. Wireless communication method of the user terminal.