WO2020194464A1 - User terminal and wireless communication method - Google Patents

Abstract

A user terminal according to the present invention comprises: a reception unit for receiving specific downlink control information (DCI) including a frequency domain resource allocation (FDRA) field; and a control unit for determining a frequency domain resource for a scheduled channel on the basis of the FDRA field. The FDRA field shows a first value representing the frequency domain resource via a resource unit comprising a plurality of resource blocks, or a second value associated with a parameter pertaining to the frequency domain resource. According to one embodiment of the present disclosure, downlink control information can be properly received.

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 an existing LTE system (for example, LTE Rel. 8-14), the user terminal (User Equipment (UE)) has downlink control information transmitted via a downlink control channel (for example, Physical Downlink Control Channel (PDCCH)). Controls the reception of downlink shared channels (for example, Physical Downlink Shared Channel (PDSCH)) based on (also referred to as Downlink Control Information (DCI), DL assignment, etc.). Further, the user terminal controls transmission of an uplink shared channel (for example, Physical Uplink Shared Channel (PUSCH)) based on DCI (also referred to as UL grant or the like).

In future wireless communication systems (for example, NR), further sophistication of mobile broadband (enhanced Mobile Broadband (eMBB)), machine type communication (massive Machine Type Communications (mMTC)) that realizes multiple simultaneous connections, high reliability and low Services such as delayed communication (Ultra-Reliable and Low-Latency Communications (URLLC)) are envisioned.

However, the configuration of downlink control information (DCI) for these services is not clear. If the configuration of the DCI is not clear, proper communication cannot be performed and the system performance may deteriorate.

Therefore, one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method for appropriately receiving downlink control information.

The user terminal according to one aspect of the present disclosure is a receiver that receives specific downlink control information (DCI) including a frequency domain resource allocation (FDRA) field, and a frequency domain resource of a channel scheduled based on the FDRA field. The FDRA field comprises a first value indicating the frequency domain resource by a resource unit containing a plurality of resource blocks, or a second value associated with a parameter relating to the frequency domain resource. Is shown.

According to one aspect of the present disclosure, downlink control information can be appropriately received.

FIG. 1 is a diagram showing an example of DCI size adjustment. 2A and 2B are diagrams showing an example of the unit. FIG. 3 is a diagram showing an example of the number of bits in the FDRA field. 4A and 4B are diagrams showing an example of the association between the FDRA field value and the FDRA parameter. FIG. 5 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. FIG. 6 is a diagram showing an example of the configuration of the base station according to the embodiment. FIG. 7 is a diagram showing an example of the configuration of the user terminal according to the embodiment. FIG. 8 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.

<Service>
In future wireless communication systems (eg, NR), further advancement of mobile broadband (enhanced Mobile Broadband (eMBB)), machine type communication (massive Machine Type Communications (mMTC)) that realizes multiple simultaneous connections, high reliability and low Services (also called use cases, traffic types, etc.) such as delayed communication (Ultra-Reliable and Low-Latency Communications (URLLC)) are assumed. For example, URLLC requires less delay and higher reliability than eMBB.

Services include communication requirements (requirements such as delay and error rate), data types (voice, data, etc.), parameters (for example, Modulation and coding scheme (MCS) table, CQI (Channel Quality Indication) table, numerology (for example). , Subcarrier spacing), frequency band, frequency range, upper layer parameters, DCI predetermined fields, DCI format, Radio Network Temporary Identifier (RNTI), etc.) may be associated with at least one of them.

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

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

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

It is required that a plurality of UEs (for example, meMBB UE and URLLC UE) targeting different requirements 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.

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

<DCI size adjustment>
Rel. At 15, the number of DCI sizes monitored by the UE is limited. If necessary, padding or truncation is applied to the DCI format to limit the number of DCI sizes. The number of DCI sizes can be limited by the size alignment procedure described in the next steps 0-4.

Step 0:
-The DCI format 0_0 to be monitored in CSS is determined. Here, the bandwidth of the UL bandwidth portion (BWP) is the size of the initial UL BWP.
The DCI format 1_0 to be monitored in CSS is determined. Here, the bandwidth of the DL BWP is given by the size of the CORESET0 when CORESET0 is set in the cell, or the size of the initial DL bandwidth portion (BWP) when the CORESET0 is not set in the cell.
If DCI format 0_0 is monitored in CSS and the number of information bits in DCI format 0_0 before padding is smaller than the payload size of DCI format 1_0 monitored in CSS for scheduling the same serving cell, DCI format. The number of zero padding bits for 0_0 is generated until the payload size of DCI format 0_0 is equal to the payload size of DCI format 1_0.
When DCI format 0_0 is monitored in CSS and the number of information bits in DCI format 0_0 before truncation is larger than the payload size of DCI format 1_0 monitored in CSS for scheduling the same serving cell, DCI format. The bit width of the frequency domain resource assignment (FDRA) field within 0_0 is the first few most significant bits so that the size of DCI format 0_0 is equal to the size of DCI format 1_0. (MSB)) is reduced by being truncated.

Step 1:
The DCI format 0_0 to be monitored in the USS is determined. Here, the bandwidth of UL BWP is the size of active UL BWP.
The DCI format 1_0 to be monitored in the USS is determined. Here, the bandwidth of the DL BWP is the size of the active DL BWP.
If DCI format 0_0 is monitored in USS and the number of information bits in DCI format 0_0 before padding is smaller than the payload size of DCI format 1_0 monitored in USS for scheduling the same serving cell, DCI format. Zero is added to DCI format 0_0 until the payload size of 0_0 is equal to the payload size of DCI format 1_0.
If DCI format 1_0 is monitored in USS and the number of information bits in DCI format 1_0 before padding is smaller than the payload size of DCI format 0_0 monitored in USS for scheduling the same serving cell, DCI format. Zero is added to DCI format 1_0 until the payload size of 1_0 is equal to the payload size of DCI format 0_0.

Step 2:
If the size of DCI format 0_1 monitored in USS is equal to the size of DCI format 0_0 or 1_0 monitored in another USS, one bit of zero padding is added to DCI format 0_1.
If the size of DCI format 1_1 monitored in USS is equal to the size of DCI format 0_0 or 1_0 monitored in another USS, one bit of zero padding is added to DCI format 1-1.1.

Step 3:
If both of the following two conditions are met, the sizing procedure is complete.
• If the total number of different DCI sizes set to monitor is not greater than 4 (less than or equal to 4) for the cell
• When the total number of different DCI sizes set to monitor and have Cell (C) -RNTI is not greater than 3 for the cell (less than 3)

Step 4:
If not, perform the following processing.
-If necessary, the padding bit introduced in step 2 above is deleted.
The DCI format 1_0 to be monitored within the USS is determined. Here, the bandwidth of the DL BWP is given by the size of the CORESET 0 when CORESET 0 is set in the cell, or the size of the initial DL BWP when the CORESET 0 is not set in the cell.
The DCI format 0_0 to be monitored within the USS is determined. Here, the bandwidth of UL BWP is the size of the initial UL BWP.
If the number of information bits in DCI format 0_0 before padding is smaller than the payload size of DCI format 1_0 monitored in USS for scheduling the same serving cell, the number of zero padding bits for DCI format 0_0 is monitored by USS. It is generated until the payload size of DCI format 0_0 to be generated is equal to the payload size of DCI format 1_0 monitored by USS.
When the number of information bits in DCI format 0_0 before truncation is larger than the payload size of DCI format 1_0 monitored in USS for scheduling the same serving cell, the bit width of the FDRA field in DCI format 0_0 is USS. It is reduced by truncating the first few MSBs so that the size of DCI format 0_0 monitored in is equal to the size of DCI format 1_0 monitored in USS.

After the above sizing procedure, the UE may not be expected to handle settings where the number of different DCI sizes set to monitor is greater than 4 for the cell. Also, the UE may not be expected to handle settings where the number of different DCI sizes with C-RNTI configured to monitor is greater than 3 for the cell.

<New DCI format>
Rel. From 16 onwards, new DCI formats are being considered. This new DCI format may be used for URLLC.

The new DCI format may have a configurable size for some fields, Rel. It may be possible to reduce the number of bits in some fields relative to 15. The minimum DCI size of this DCI format is Rel. It may be possible to reduce 10 to 16 bits from the DCI format size (up to 44 bits) of 15 fallback DCIs. The maximum DCI size of this DCI format is Rel. It may be possible to be larger than the fallback DCI of 15. This DCI format is available in Rel. It may be possible to align the size of a fallback DCI of 15 (or for eMBB). Zero padding may be performed if necessary.

Here, the fallback DCI is, for example, a DCI transmitted in at least one of a common search space (Common Search Space (CSS)) and a user terminal-specific search space (UE-specific Search Space (USS)), and is a UE. It may be a DCI whose configuration (content, payload size, etc.) cannot be set by a unique upper layer signaling (eg, RRC signaling). The fallback DCI may be used before the RRC connection.

The fallback DCI that schedules the PDSCH may be referred to as DCI format 1_0, and the fallback DCI that schedules the PUSCH may be referred to as DCI format 0_0.

Note that the fallback DCI may be configured (contents, payload, etc.) by higher layer signaling (for example, broadcast information, system information, etc.) common to UEs.

The non-fallback DCI may be, for example, a DCI transmitted in the USS and whose configuration (content, payload size, etc.) can be set by UE-specific upper layer signaling (for example, RRC signaling). The fallback DCI may be used after the RRC connection.

The non-fallback DCI that schedules PDSCH may be referred to as DCI format 1-11, and the non-fallback DCI that schedules PUSCH may be referred to as DCI format 0_1.

The configuration of the new DCI format (content, payload size, etc.) may be set by higher layer signaling.

As mentioned above, the number of DCI sizes monitored by the UE is limited, so if the size of the new DCI format is different from the size of the fallback DCI, the DCI size adjustment will change the size of the new DCI format to the size of the fallback DCI. It is possible that they can be matched. If the size of the DCI format is smaller than the size of the fallback DCI, DCI sizing is easy because only zero padding is sufficient. If the size of the DCI format is larger than the size of the fallback DCI, the DCI sizing needs to compress one or more fields in the DCI format.

For example, when matching the size of the new DCI format used for eURLLC to the size of the fallback DCI or the non-fallback DCI, how to match the size of the new DCI format becomes a problem.

As described above, the DCI size adjustment for a specific DCI format (for example, a new DCI format) is not clear. If the DCI size adjustment is not clear, proper communication cannot be performed and the system performance may deteriorate.

Therefore, the present inventors have conceived a DCI size adjustment method for a specific DCI format.

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.

In the present disclosure, the first communication service, URLLC, and eURLLC may be read as each other. The second communication service, eMBB, may be read interchangeably.

In the present disclosure, the fallback DCI may be read as a fallback DCI for eMBB, DCI format 0_0, 1_0, first DCI, and the like. The non-fallback DCI may be read as a non-fallback DCI for eMBB, DCI formats 0_1, 1_1, a second DCI, and the like. The specific DCI, the new DCI, the URLLC DCI, the specific DCI format, the new DCI format, and the URLLC DCI format may be read as each other.

(Wireless communication method)
The specific DCI format may be subject to DCI size adjustment as needed. At least one of the base station and the UE may perform DCI size adjustment of a specific DCI format as needed.

The specific DCI format may be a new DCI format used for URLLC.

<Embodiment 1>
The DCI size reduction in the DCI size adjustment may be achieved by compression of the FDRA field.

FIG. 1 shows an example of DCI size adjustment that matches the size of a specific DCI format with the size of fallback DCI.

If the size of the specific DCI format is smaller than the size of the fallback DCI, the DCI size adjustment may match the size of the specific DCI format to the size of the fallback DCI by zero padding.

If the size of the specific DCI format is larger than the size of the fallback DCI, the DCI size adjustment may match the size of the specific DCI format to the size of the fallback DCI by FDRA field compression.

The UE may determine the frequency resources (frequency domain resources) of the scheduled channel (eg, PDSCH, PUSCH, etc.) based on the FDRA field in the particular DCI format.

The FDRA field may be compressed by at least one of the following compression methods 1 and 2.

<< Compression method 1 >>
The resource indication value (RIV) indicated by the FDRA field in a particular DCI format may indicate a unit (unit frequency resource) containing x RBs (eg, virtual RB (VRB)).

Units may be referred to as groups, bundles, chunks, RB units, RB groups, RB bundles, RB chunks, resource units, resource groups, resource bundles, resource chunks, and so on.

If the BWP size (the number of RBs in the scheduled BWP) is not divisible by x, the remaining (remainder) RB (surplus portion) may be used as a unit with a number smaller than x. The remaining RB may be the highest frequency resource in the BWP, as shown in FIG. 2A, or the lowest frequency resource in the BWP, as shown in FIG. 2B.

Also, if the BWP size is not divisible by x, the remaining RB may not be used as a unit.

The UE may set whether or not the remaining RB is used as a unit by higher layer signaling.

In the specific DCI format, the size (number of bits, bit width) of the FDRA field for resource allocation (RA) type 1 may be given by the following equation.

Here, N ^RU is the number of units in the BWP. When BWP of the RB number and N ^RB, N ^RU when the remaining RB is used as a unit when N ^RB is not divisible by x may be given by the following equation.

If the N ^RB is not divisible by x and the remaining RB is not used as a unit, the N ^RU may be given by:

The FDRA field for DL resource allocation type 1 may consist of a starting unit RU _start , a length L _RUs represented by consecutively allocated units, and a corresponding RIV. The size of the unit may be determined by the value of x.

RIV may be given by the following equation.

The UE may recognize the frequency resources of the scheduled channel based on the RIV of the specific DCI field.

The UE may determine the value of x by at least one of the following options 1-1-1, 1-1-2.

<< Option 1-1-1 >>
The UE may set the value of x by the upper layer parameter.

<< Option 1-1-2 >>
The value of x may be determined so that the total size of the particular DCI format is equal to the size of the fallback DCI. At least one of the base stations and UEs may determine the value of x such that the total size of the particular DCI format is equal to the size of the fallback DCI.

FIG. 3 is a diagram showing an example of the relationship between the unit size x, the number of RBs in the BWP, and the size of the FDRA field. The larger x is, the smaller the number of bits in the FDRA field can be. For example, the value of x may be determined from the number of RBs in the BWP and the size of the FDRA field using this relationship.

According to the above embodiment 1-1, the size of the specific DCI field can be reduced by compressing the FDRA field. By determining the size x of the unit, the size of the specific DCI format can be matched to the target DCI size.

<< Compression method 2 >>
Each code point (value) of the FDRA field may be mapped to a parameter related to FDRA (FDRA parameter).

Similar to the TDRA field in DCI format 0_1 or 1-11, each code point of the FDRA field in the specific DCI format may be mapped to the FDRA parameter.

The UE may set the mapping between each code point of the FDRA field and the FDRA parameter by higher layer signaling. The mapping between each code point in the FDRA field and the parameters associated with the FDRA may be specified in the specification (eg, table).

The size of the FDRA field may be expressed by the following equation.

Here, M may be the number of values set for the FDRA field.

For example, as shown in FIGS. 4A and 4B, for example, when M is 6, the size of the FDRA field is 3 bits.

The FDRA parameter may follow at least one of the following options 1-2-1, 1-2-2.

<< Option 1-2-1 >>
The FDRA parameter may be RIV. FIG. 4A is a diagram showing an example of the association between the FDRA field value and RIV. The FDRA parameter may include the starting RB and the number of consecutive RBs instead of the RIV.

The UE may determine the start RB and the number of consecutive RBs for the scheduled channel based on the RIV associated with the FDRA field value.

<< Option 1-2-2 >>
The FDRA parameter may include at least one of RA type, RIV and resource block group (RBG). RBG may be a continuous VRB. The UE may set the number of RBs in the RBG by higher layer signaling (eg, rbg-Size). The FDRA parameter may include the starting RB and the number of consecutive RBs instead of RIV.

For example, as shown in FIG. 4B, the RA type may indicate 0 (RA type 0) or 1 (RA type 1). If the RA type is 0, the FDRA parameter may indicate 1 or more RBGs. One or more RBGs may be represented by a bitmap (RBG bitmap). Each bit in the bitmap corresponds to RBG and may indicate whether or not the corresponding RBG has an assignment. If the RA type is 1, the FDRA parameter may indicate RIV. The RBG index in FIG. 4B may indicate the position of a bit that is 1 in the bitmap.

The UE determines the RA type based on the FDRA field value, determines the RBG associated with the FDRA field value if the RA type is 0, and is associated with the FDRA field value if the RA type is 1. The starting RB and the number of consecutive RBs for the scheduled channel may be determined based on the RIV.

According to the above embodiment 1-2, the size of the specific DCI field can be reduced by compressing the FDRA field. The UE can simplify the process by performing an operation similar to the operation for the TDRA field. According to option 1-2-1, RA type 1 can be supported. According to option 1-2-2, both RA type 0 and RA type 1 can be supported.

<Embodiment 2>
For UEs that support both eMBB and URLLC, Rel. Fifteen fallback DCIs and non-fallback DCIs may be used. In other words, UEs that support both eMBB and URLLC are Rel. Fifteen fallback DCIs and non-fallback DCIs may be monitored.

Rel. In No. 15, the total number of DCI sizes for the UE with respect to the serving cell is 4 or less, and the number of DCI sizes with C-RNTI for the UE with respect to the serving cell is 3 or less (DCI size budget). Limits).

In the case where the UE has a limit on the planned number of DCI sizes, the size of the specific DCI used for URLLC may be adjusted to the size of the fallback DCI or the non-fallback DCI.

The size of the specific DCI used for DL scheduling of URLLC may be the same as the size of the specific DCI used for UL scheduling of URLLC.

If the total number of fallback DCI size and non-fallback DCI size exceeds the UE limit, the specific DCI format size may be matched to the fallback DCI size or non-fallback DCI size.

The DCI size adjustment for the specific DCI format may follow at least one of the following adjustment methods 1 to 4.

<< Adjustment method 1 >>
The DCI sizing may always match the size of the particular DCI format to the size of the fallback DCI. The UE and the base station may always match the size of the particular DCI format to the size of the fallback DCI.

The DCI size adjustment may be zero padding or compression of a specific DCI format. The bit added by zero padding may be used as a virtual cyclic redundancy check (Virtual Cyclic Redundancy Check (V-CRC)) bit. By using the V-CRC bit, the false alarm probability can be reduced. 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.

<< Adjustment method 2 >>
The DCI size adjustment may always match the size of the particular DCI format to the size of the non-fallback DCI. The UE and the base station may always match the size of the particular DCI format to the size of the non-fallback DCI.

The DCI size adjustment may be zero padding or compression of a specific DCI format. The bits added by zero padding may be used as V-CRC bits.

<< Adjustment method 3 >>
The DCI size adjustment may depend on the configuration by the base station. The UE may set whether or not to match the size of the specific DCI format with the size of the fallback DCI by upper layer signaling, and whether or not to match the size of the specific DCI format with the size of the non-fallback DCI. , May be set by higher layer signaling. Whether the size of the specific DCI format is matched to the size of the fallback DCI or the size of the non-fallback DCI may be set by the upper layer signaling.

<< Adjustment method 4 >>
Which DCI format size to match the size of the specific DCI format may depend on a predetermined condition. The UE and the base station may determine which DCI format size to match the size of the specific DCI format based on predetermined conditions. The UE predetermined condition may follow at least one of the following adjustment methods 4-1 to 4-3.

<< Adjustment method 4-1 >>
If the size of the specific DCI format before padding or compression is larger than the size of the non-fallback DCI, then the size of the specific DCI format is matched to the size of the non-fallback DCI, otherwise the size of the specific DCI format is , May be adapted to the size of the fallback DCI.

<< Adjustment method 4-2 >>
If the size of the particular DCI format before padding or compression is smaller than the size of the fallback DCI, then the size of the particular DCI format is matched to the size of the fallback DCI, otherwise the size of the particular DCI format is non- It may be matched to the size of the fallback DCI.

<< Adjustment method 4-3 >>
A + X = C and C <B, and X> = predetermined values (for example, 10 to 10) with respect to the size A of the fallback DCI, the size B of the non-fallback DCI, and the size C of the specific DCI format before padding or compression. If 16), the size of the particular DCI format may be matched to the size of the non-fallback DCI, otherwise the size of the particular DCI format may be matched to the size of the fallback DCI.

According to the second embodiment, the size of the specific DCI can be adjusted appropriately.

(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. 5 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 system 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)). A signal block containing SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB), or 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. 6 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 this example mainly shows the functional blocks of the feature portion in the present embodiment, 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 conversion, 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, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.

The transmission / reception unit 120 (measurement unit 123) may perform measurement on the received signal. For example, the 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 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 transmitting / receiving unit 120 and the transmitting / receiving antenna 130.

(User terminal)
FIG. 7 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 common recognition in the technical fields 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 processing, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed 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. on the baseband signal to the radio frequency band, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..

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

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

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

The transmission unit and the reception unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmission / reception unit 220, the transmission / reception antenna 230, and the transmission line interface 240.

Further, the transmission / reception unit 220 may receive specific downlink control information (DCI) including a frequency domain resource allocation (FDRA) field. The control unit 210 may determine the frequency domain resource of the scheduled channel (eg, PDSCH, PUSCH, etc.) based on the FDRA field. The FDRA field may be a first value (eg, RIV) indicating the frequency domain resource by a resource unit containing a plurality of resource blocks, or a second value (eg, the code of the FDRA field) associated with a parameter relating to the frequency domain resource. Point, value), may be indicated. The first value may indicate the start resource unit and the number of resource units of the frequency domain resource by using the resource unit including a plurality of resource blocks (for example, x RBs) (Embodiment 1-1). The parameters are the allocation type of the frequency domain resource (eg, RA type 0 or 1), the resource indication value (eg, RIV) for the starting resource block and the number of resource blocks of the frequency domain resource, and the frequency domain resource (eg, RIV). , RBG) and at least one of (Embodiment 1-2).

The specific DCI is used for the first communication service, and the size of the specific DCI is one of the size of the first DCI used for the second communication service and the size of the second DCI used for the second communication service. The size of the second DCI may be larger than the size of the first DCI.

The size of the specific DCI may be matched to the size of the first DCI by indicating the first value or the second value in the FDRA field (Embodiment 1).

The control unit 210 may set whether the size of the specific DCI is the size of the first DCI or the second DCI (Embodiment 2, Adjustment Method 3).

The control unit 210 may determine whether the size of the specific DCI is the size of the first DCI or the second DCI based on a predetermined condition (Embodiment 2, Adjustment Method 4).

(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 two or more devices that are physically or logically separated). , 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. 8 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 may also be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard. Further, the component carrier (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. The PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.

The wireless frame, subframe, slot, mini slot 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. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini slot, a sub slot, a slot, or 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 numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

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

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, features, 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 the 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)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "Access point", "Transmission point (Transmission Point (TP))", "Reception point (Reception Point (RP))", "Transmission / reception point (Transmission / Reception Point (TRP))", "Panel" , "Cell", "sector", "cell group", "carrier", "component carrier" and the like 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 (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) 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. In addition, 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)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 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" and "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

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

In addition, "judgment (decision)" means receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access (for example). It may be regarded as "judgment (decision)" of "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 the rated maximum transmission power (the). It may mean rated UE maximum transmit power).

The terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection or connection 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 an amended or modified mode without departing from the spirit and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of exemplification and does not bring any limiting meaning to the invention according to the present disclosure.

Claims (6)

1. A receiver that receives specific downlink control information (DCI), including a frequency domain resource allocation (FDRA) field, and
   It has a control unit that determines the frequency domain resource of the scheduled channel based on the FDRA field.
   The FDRA field indicates a first value indicating the frequency domain resource by a resource unit including a plurality of resource blocks, or a second value associated with a parameter related to the frequency domain resource.
2. The specific DCI is used for the first communication service and is used.
   The size of the specific DCI is matched to one of the size of the first DCI used for the second communication service and the size of the second DCI used for the second communication service.
   The user terminal according to claim 1, wherein the size of the second DCI is larger than the size of the first DCI.
3. The user terminal according to claim 2, wherein the size of the specific DCI is matched with the size of the first DCI by indicating the first value or the second value in the FDRA field.
4. The user terminal according to claim 2 or 3, wherein the control unit is set to determine which of the first DCI and the second DCI is the size of the specific DCI.
5. The user terminal according to claim 2 or 3, wherein the control unit determines whether the size of the specific DCI is the size of the first DCI or the second DCI based on a predetermined condition.
6. The step of receiving specific downlink control information (DCI) including the frequency domain resource allocation (FDRA) field, and
   It has a step of determining the frequency domain resource of the scheduled channel based on the FDRA field.
   The FDRA field indicates a first value indicating the frequency domain resource by a resource unit including a plurality of resource blocks, or a second value associated with a parameter related to the frequency domain resource, which is a wireless communication method of a user terminal.

Images