WO2024024969A1 - Device and method - Google Patents

Abstract

A device according to an aspect of the present disclosure comprises an information acquisition unit that acquires an RRC (radio resource control) message and a communication processing unit that transmits the RRC message to user equipment. The user equipment is RedCap UE, and the RRC message includes first information indicating a bandwidth part used by the user equipment and second information indicating a frequency band set within the bandwidth part and used by the user equipment.

Description

Apparatus and method Cross-reference of related applications

This application is based on Japanese Patent Application No. 2022-122257 filed on July 29, 2022, and claims the benefit of priority thereof, and all contents of the patent application are Incorporated herein by reference.

The present disclosure relates to apparatus and methods.

Mobile communication technology has been proposed in the 3GPP (3rd Generation Partnership Project) (registered trademark) and is defined in technical specifications (TS). In particular, currently, 5G (5th Generation) technology has been proposed and defined as TS.

As described in Non-Patent Document 1, a new study item (SI) called "further NR RedCap UE complexity reduction" has been launched in 3GPP Release 18 (Rel-18). This SI is for defining the functions of Rel-18 RedCap UE, which has capabilities between LPWA (Low Power Wide Area) UE (User Equipment) and Release 17 (Rel-17) RedCap (reduced capability) UE. It is. Specific use cases include industrial sensors, surveillance cameras, and wearable devices. Additionally, the objectives of the SI mentioned above include a reduction in UE bandwidth to 5 MHz in frequency range (FR1) and a reduced UE peak data rate in FR1. As described above, UE technologies are being considered that aim to be widely disseminated in the market by reducing functions and reducing costs.

For example, Non-Patent Document 2 proposes reducing the bandwidth of the data channel in FR1 in order to reduce the peak data rate of the UE. Furthermore, Non-Patent Document 2 describes that a narrower BWP for Rel-18 RedCap UE is arranged within a bandwidth part (BWP) for Rel-17 RedCap UE.

For example, Non-Patent Document 3-6 also proposes content regarding Rel-18 RedCap UE.

As mentioned above, Non-Patent Document 2 describes that a narrower BWP for Rel-18 RedCap UE is arranged within the BWP for Rel-17 RedCap UE. However, the inventor believes that in the current 3GPP TS, it is possible to configure a BWP for a Rel-17 RedCap UE by using information elements included in, for example, an RRC (radio resource control) Reconfiguration message; The problem was found that it was not possible to further set a narrow BWP.

An object of the present disclosure is to provide an apparatus and method that allows further configuration of frequency bands within BWP for RedCap UEs.

An apparatus according to an aspect of the present disclosure includes an information acquisition unit that acquires an RRC message, and a communication processing unit that transmits the RRC message to a user device, the user device being a RedCap UE, and the RRC message includes first information indicating a bandwidth portion used by the user equipment, and second information indicating the frequency band set within the bandwidth portion and used by the user equipment. Contains information and.

A device according to an aspect of the present disclosure includes a communication processing unit that receives an RRC message transmitted by a base station, and an information acquisition unit that acquires first information and second information included in the RRC message. wherein the first information indicates a bandwidth portion used by the user equipment, and the second information is a frequency band set within the bandwidth portion and used by the user equipment. Indicating the frequency band, the user equipment is a RedCap UE.

A method performed by a base station according to an aspect of the present disclosure includes obtaining an RRC message and transmitting the RRC message to a user equipment, wherein the user equipment is a RedCap UE and the RRC message is transmitted to a user equipment. The message includes first information indicating a bandwidth portion used by the user equipment, and second information indicating a frequency band set within the bandwidth portion and the frequency band used by the user equipment. Contains information on and.

According to the present disclosure, it becomes possible to further configure frequency bands within BWP for RedCap UE. Note that, according to the present disclosure, other effects may be achieved instead of or in addition to this effect.

FIG. 1 is an explanatory diagram showing an example of a schematic configuration of a system according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram illustrating an example of a carrier and BWP according to an embodiment of the present disclosure. FIG. 1 is a block diagram illustrating an example of a schematic functional configuration of a base station according to an embodiment of the present disclosure. FIG. 1 is a block diagram illustrating an example of a schematic hardware configuration of a base station according to an embodiment of the present disclosure. FIG. 2 is a block diagram illustrating an example of a schematic functional configuration of a UE according to an embodiment of the present disclosure. FIG. 2 is a block diagram illustrating an example of a schematic hardware configuration of a UE according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram illustrating an example of BWP and frequency bands according to an embodiment of the present disclosure. FIG. 2 is an explanatory diagram showing an example of a first information element according to an embodiment of the present disclosure. FIG. 7 is an explanatory diagram illustrating an example of a second information element according to an embodiment of the present disclosure. FIG. 7 is an explanatory diagram illustrating an example of a third information element according to an embodiment of the present disclosure. FIG. 7 is an explanatory diagram illustrating an example of a fourth information element according to an embodiment of the present disclosure. FIG. 2 is a sequence diagram for explaining an example of a schematic flow of processing according to an embodiment of the present disclosure. FIG. 7 is an explanatory diagram illustrating an example of frequency band offset and bandwidth according to a second modification of the embodiment of the present disclosure. It is an explanatory view showing an example of the 3rd information element concerning the 2nd modification of the embodiment of this indication. It is an explanatory view showing an example of the 4th information element concerning the 2nd modification of the embodiment of this indication. FIG. 7 is an explanatory diagram showing a first example of frequency band candidates according to third to fifth modified examples of the embodiment of the present disclosure. FIG. 7 is an explanatory diagram showing a second example of frequency band candidates according to third to fifth modified examples of the embodiment of the present disclosure. FIG. 7 is an explanatory diagram showing a third example of frequency band candidates according to third to fifth modified examples of the embodiment of the present disclosure. FIG. 7 is an explanatory diagram showing a fourth example of frequency band candidates according to third to fifth modified examples of the embodiment of the present disclosure. It is an explanatory diagram showing an example of the 3rd information element concerning the 6th modification of the embodiment of this indication. It is an explanatory view showing an example of the 4th information element concerning the 6th modification of the embodiment of this indication. FIG. 12 is a sequence diagram for explaining an example of a schematic flow of processing according to an eighth modification example of the embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. Note that, in this specification and the drawings, elements that can be explained in the same manner may be designated by the same reference numerals, so that redundant explanation can be omitted.

The explanation will be given in the following order.
1. System configuration 2. Base station configuration 3. Configuration of user equipment 4. Operation example 5. Variant

<1. System configuration>
An example of the configuration of a system 1 according to an embodiment of the present disclosure will be described with reference to FIG. 1. Referring to FIG. 1, system 1 includes a base station 100, user equipment (UE) 30, UE 40, and UE 200.

For example, system 1 is a system compliant with 3GPP TS. More specifically, for example, the system 1 is a system compliant with 5G or NR (New Radio) TS. Naturally, system 1 is not limited to this example.

(1) Base station 100
The base station 100 is a node of a radio access network (RAN) and communicates with UEs located within the coverage area 10 of the base station 100. For example, base station 100 communicates with UE30, UE40, and UE200.

For example, the base station 100 communicates with a UE (eg, UE 30, UE 40, or UE 200) using a RAN protocol stack. For example, the protocol stack includes RRC, SDAP (service data adaptation protocol), PDCP (packet data convergence protocol), RLC (radio link control), MAC (medium access control), and physical (PHY) layer protocols. including. Alternatively, the protocol stack may not include all of these protocols, but may include some of these protocols.

For example, the base station 100 is a gNB. The gNB is a node that provides NR user plane and control plane protocol terminations to the UE and is connected to the 5GC (5G Core Network) via the NG interface. Alternatively, the base station 100 may be an en-gNB. The en-gNB is a node that provides NR user plane and control plane protocol termination for the UE and operates as a secondary node in EN-DC (E-UTRA-NR Dual Connectivity).

The base station 100 may include multiple nodes. The plurality of nodes may include a first node that hosts a higher layer included in the protocol stack and a second node that hosts a lower layer included in the protocol stack. good. The upper layer may include RRC, SDAP, and PDCP, and the lower layer may include RLC, MAC, and PHY layer. The first node may be a CU (central unit), and the second node may be a DU (distributed unit). Note that the plurality of nodes may include a third node that performs processing below the PHY layer, and the second node may perform processing above the PHY layer. The third node may be an RU (radio unit).

Alternatively, the base station 100 may be one of the plurality of nodes, or may be connected to another unit among the plurality of nodes.

The base station 100 may be an integrated access and backhaul (IAB) donor or an IAB node.

(2) UE30, UE40 and UE200
Each of UE30, UE40, and UE200 communicates with a base station. For example, each of UE30, UE40, and UE200 communicates with base station 100 when located within coverage area 10 of base station 100.

For example, each of UE30, UE40, and UE200 communicates with a base station (for example, base station 100) using the above protocol stack.

For example, UE30 is a normal UE that is not a RedCap UE, and UE40 and UE200 are RedCap UEs. A RedCap UE is a UE with reduced capabilities. Furthermore, UE 40 is a first type of RedCap UE, and UE 200 is a second type of RedCap UE. The first type of RedCap UE is a UE whose maximum bandwidth is 20 MHz for FR1 and 100 MHz for FR2. FR1 is a frequency range from 450 MHz to 6000 MHz, and FR2 is a frequency range from 24250 MHz to 52600 MHz. The second type of RedCap UE is a UE with further reduced capabilities than the first type of RedCap UE. For example, the peak data rate of the second type of RedCap UE is lower than the peak data rate of the first type of RedCap UE. For example, the second type of RedCap UE communicates with the base station using a narrower band than the first type of RedCap UE. For example, the maximum bandwidth of the second type of RedCap UE is smaller than the maximum bandwidth of the first type of RedCap UE. The maximum bandwidth is, for example, the maximum bandwidth when transmitting and receiving specific information (for example, user data, etc.). For example, the first type of RedCap UE is a Rel-17 RedCap UE, and the second type of RedCap UE is a Rel-18 RedCap UE. The second type of RedCap UE may be referred to as an eRedCap UE.

Note that in the embodiment of the present disclosure, the UE 200 may perform not only the operations described as the operations of the UE 200 but also the operations described as the operations of the UE 30 and/or the operations described as the operations of the UE 40. .

(3) BWP
(3-1) Setting BWP The base station 100 sets BWP used by the UE in a carrier having system bandwidth. The bandwidth of the BWP is smaller than the system bandwidth. Such BWP allows the UE to communicate with the base station 100 within the carrier even if the maximum bandwidth of the UE is smaller than the bandwidth of the carrier. System bandwidth, which is the bandwidth of a carrier, is also called channel bandwidth.

For example, the above BWP includes downlink (DL) BWP and uplink (UL) BWP. The UE receives a signal from the base station 100 using the DL BWP, and transmits a signal to the base station 100 using the UL BWP.

Referring to the example of FIG. 2, the base station 100 sets up BWP15 in the carrier 13, and the UE communicates with the base station 100 using BWP15. The carrier 13 may be a DL carrier, and the BWP 15 may be a DL BWP. Alternatively, the carrier 13 may be a UL carrier, and the BWP 15 may be a UL BWP.

(3-2) Types of BWPs The base station 100 sets multiple types of BWPs.

-Initial BWP
First, base station 100 sets an initial BWP. The initial BWP includes an initial DL BWP and an initial UL BWP. The initial DL BWP may be identified as a DL BWP with an ID value set to 0. Further, the initial UL BWP may be specified as a UL BWP whose ID value is set to 0.

For example, the base station 100 transmits SIB1 including information indicating the above-mentioned initial BWP. The information includes initialDownlinkBWP and/or initialUplinkBWP included in ServingCellConfigCommon in SIB1. For example, the base station 100 may set the above-mentioned initial DL BWP using initialDownlinkBWP. Furthermore, the base station 100 may set the above-mentioned initial UL BWP using initialUplinkBWP. The initialDownlinkBWP includes a parameter indicating the position and bandwidth of the initial DL BWP, and a parameter indicating the subcarrier interval of the initial DL BWP. Further, the initialDownlinkBWP may include a parameter indicating the cyclic prefix of the initial DL BWP. Similarly, the initialUplinkBWP includes a parameter indicating the position and bandwidth of the initial UL BWP, and a parameter indicating the subcarrier interval of the initial UL BWP. Further, the initialUplinkBWP may include a parameter indicating the cyclic prefix of the initial UL BWP.

The initialDownlinkBWP may also include a parameter indicating the Search Space Set (SSS) for the SIB1 message. For example, the base station 100 may set Search Space Set #0 (SSS #0) with ID set to 0 in the initial DL BWP of the primary cell as the SSS for the SIB1 message. SSS #0 is also called Type 0-PDCCH CSS Set (type-0 PDCCH common search space set). For example, the SSS for SIB1 messages may be configured for monitoring a physical downlink control channel (PDCCH) for downlink control information (DCI) with a system information radio network temporary identifier (SI-RNTI). The DCI is a DCI format used for PDSCH scheduling, and is, for example, DCI format 1_0. That is, the base station 100 may schedule a PDSCH using DCI with SI-RNTI and transmit the SIB1 message on the PDSCH.

Additionally, the initialDownlinkBWP may include a parameter indicating the SSS for the random access procedure. The SSS for random access procedures is also called Type 1-PDCCH CSS Set. For example, SSS for random access procedures may be configured for monitoring PDCCH for DCI with RA-RNTI (random access radio network temporary identifier). The DCI is a DCI format used for PDSCH scheduling, and is, for example, DCI format 1_0. That is, the base station 100 may schedule a PDSCH using a DCI with RA-RNTI and transmit a random access response on the PDSCH.

Additionally, the initialDownlinkBWP may include a parameter indicating SSS for paging. SSS for paging is also called Type2-PDCCH CSS Set. For example, SSS for paging may be configured for monitoring PDCCH for DCI with P-RNTI (paging radio network temporary identifier). The DCI is a DCI format used for PDSCH scheduling, and is, for example, DCI format 1_0. That is, the base station 100 may schedule a PDSCH using a DCI with P-RNTI and transmit a paging message on the PDSCH.

For example, the UE 30, which is a normal UE, receives the SIB1 and acquires the information included in the SIB1. The UE 30 is configured with the initial BWP and communicates with the base station 100 using the initial BWP. For example, the UE 30 specifies the initial DL BWP based on the initialDownlinkBWP. Furthermore, the UE 30 identifies the initial UL BWP based on the initialUplinkBWP. Furthermore, the UE 30 may monitor the PDCCH for DCI with SI-RNTI, RA-RNTI, and/or P-RNTI in the SSS configured using the initialDownlinkBWP. Furthermore, the UE 30 may receive an SIB1 message, a random access response, and/or a paging message on a PDSCH scheduled using a DCI with SI-RNTI, RA-RNTI, and/or P-RNTI. good.

Note that if SIB1 does not include information indicating the initial DL BWP, the initial DL BWP may be the same as the band of CORESET (control resource set) #0 for scheduling SIB1. That is, the base station 100 does not need to include information indicating the initial DL BWP in the SIB1, and the UE 30 may consider the band of CORESET #0 to be the initial DL BWP if the SIB1 does not include the information.

-RedCap-specific initial BWP
Second, the base station 100 configures the initial BWP for the RedCap UE. Here, the initial BWP for RedCap UE is referred to as RedCap-specific initial BWP. A normal UE that is not a RedCap UE does not use the RedCap-specific initial BWP, and the RedCap UE uses the RedCap-specific initial BWP.

The RedCap-specific initial BWP includes an initial DL BWP for RedCap UE and an initial UL BWP for RedCap UE. Here, the initial DL BWP for RedCap UE is called RedCap-specific initial DL BWP, and the initial UL BWP for RedCap UE is called RedCap-specific initial UL BWP.

For example, the base station 100 transmits SIB1 including information indicating the RedCap-specific initial BWP. The information includes initialDownlinkBWP-RedCap-r17 and/or initialUplinkBWP-RedCap-r17 included in ServingCellConfigCommon in SIB1. For example, the base station 100 may set the initial DL BWP specific to the RedCap using the initialDownlinkBWP-RedCap-r17. Furthermore, the base station 100 may set the initial UL BWP specific to the RedCap using the initialUplinkBWP-RedCap-r17. initialDownlinkBWP-RedCap-r17 includes a parameter indicating the position and bandwidth of the initial DL BWP specific to the RedCap, and a parameter indicating the subcarrier interval of the initial DL BWP specific to the RedCap. Further, the initialDownlinkBWP-RedCap-r17 may include a parameter indicating the cyclic prefix of the initial DL BWP specific to the RedCap. Similarly, initialUplinkBWP-RedCap-r17 includes a parameter indicating the position and bandwidth of the initial UL BWP specific to the RedCap, and a parameter indicating the subcarrier interval of the initial UL BWP specific to the RedCap. Further, the initialUplinkBWP-RedCap-r17 may include a parameter indicating the cyclic prefix of the initial UL BWP specific to the RedCap.

Additionally, the initialDownlinkBWP-RedCap-r17 may include a parameter indicating SSS for the SIB1 message. The initialDownlinkBWP may also include a parameter indicating the SSS for the random access procedure. Further, initialDownlinkBWP may include a parameter indicating SSS for paging.

For example, the UE 40, which is the first type of RedCap UE, receives the SIB1 and acquires the information included in the SIB1. Then, the UE 40 is set with the RedCap-specific initial BWP, and communicates with the base station 100 using the RedCap-specific initial BWP. For example, the UE 40 identifies the RedCap-specific initial DL BWP based on the initialDownlinkBWP-RedCap-r17. Furthermore, the UE 40 identifies the initial UL BWP specific to the RedCap based on the initialUplinkBWP-RedCap-r17. Furthermore, the UE 40 may monitor the PDCCH for the DCI with the SI-RNTI, RA-RNTI, and/or P-RNTI in the SSS configured using the initialDownlinkBWP-RedCap-r17. Additionally, the UE 40 may receive the SIB1 message, random access response, and/or paging message on the PDSCH scheduled by the DCI with the SI-RNTI, RA-RNTI, and/or P-RNTI.

Note that if SIB1 does not include information indicating the initial DL BWP specific to RedCap, the initial DL BWP specific to RedCap may be specified based on the information indicating the initial DL BWP. Furthermore, when SIB1 does not include information indicating the initial UL BWP specific to RedCap, the initial UL BWP specific to RedCap may be specified based on the information indicating the initial UL BWP. That is, when initialDownlinkBWP-RedCap-r17 is included in SIB1, UE40 may specify the RedCap-specific initial DL BWP based on initialDownlinkBWP-RedCap-r17 instead of initialDownlinkBWP. . Further, when the SIB1 includes initialUplinkBWP-RedCap-r17, the UE 40 may specify the initial UL BWP specific to RedCap based on the initialUplinkBWP-RedCap-r17 instead of the initialUplinkBWP. Further, if the SIB1 does not include the initialDownlinkBWP-RedCap-r17, the UE40 may specify the initial DL BWP (which may be an initial DL BWP specific to RedCap) based on the initialDownlinkBWP. Further, if the SIB1 does not include the initialUplinkBWP-RedCap-r17, the UE 40 may specify the initial UL BWP (or the initial UL BWP specific to RedCap) based on the initialUplinkBWP-RedCap-r17.

-BWP
Thirdly, the base station 100 sets a BWP that is not the initial BWP. The BWP is a UE-specific BWP and is configured using an RRC message addressed to the UE. The RRC message addressed to the UE is also called a UE-specific RRC message. For example, the BWP is simply referred to as BWP. Alternatively, the BWP may be called RRC Configured BWP, Configured BWP, UE-Specific BWP, or dedicated BWP. The above BWP includes DL BWP and UL BWP. The DL BWP may be identified as a DL BWP whose ID is set to a value other than 0. Further, the UL BWP may be specified as a UL BWP whose ID is set to a value other than 0.

For example, the base station 100 transmits an RRC message including information indicating the BWP to the UE. For example, the RRC message is an RRC Reconfiguration message. The information indicating the BWP includes BWP-Downlink and/or BWP-Uplink included in the ServingCellConfig in the RRC message. For example, the base station 100 may set the above DL BWP using BWP-Downlink. Furthermore, the base station 100 may set the above-mentioned UL BWP using BWP-Uplink. BWP-Downlink includes a parameter indicating the position and bandwidth of the DL BWP, and a parameter indicating the subcarrier interval of the DL BWP. Further, BWP-Downlink may include a parameter indicating the cyclic prefix of the DL BWP. Similarly, the BWP-Uplink includes a parameter indicating the position and bandwidth of the UL BWP, and a parameter indicating the subcarrier interval of the UL BWP. Further, the BWP-Uplink may include a parameter indicating the cyclic prefix of the UL BWP.

Additionally, the BWP-Downlink may include the UE-specific parameters of the DL BWP. The UE-specific parameter of the DL BWP is also called BWP-DownlinkDedicated. For example, the UE-specific parameters include parameters related to SSS of PDCCH. Here, the parameters related to SSS include parameters related to USS (UE-specific search space set) and/or parameters related to CSS. For example, the USS and/or CSS of the PDCCH may be C-RNTI (cell radio network temporary identifier), MCS-C-RNTI (modulation and coding scheme cell radio network temporary identifier), and/or CS-RNTI ( configured for PDCCH monitoring for DCI with configured scheduling radio network temporary identifier). The DCI is a DCI format used for PDSCH scheduling, and is, for example, DCI format 1_0 and/or DCI format 1_1. Further, the DCI is a DCI format used for PUSCH scheduling, and may be, for example, DCI format 0_0 and/or DCI format 0_1.

For example, the base station 100 schedules a PDSCH using a C-RNTI, an MCS-C-RNTI, and/or a DCI with a CS-RNTI, and uses downlink data (downlink shared channel (DL-SCH)) on the PDSCH. :　Downlink　Shared　Channel) data) may also be sent. Furthermore, the base station 100 schedules the PUSCH using the C-RNTI, MCS-C-RNTI, and/or DCI with CS-RNTI, and uses the PUSCH to schedule uplink data (uplink shared channel (UL-SCH)). :　Uplink　Shared　Channel) data) may be received. Here, the CSS configured using the UE-specific parameters is also referred to as Type 3-PDCCH CSS Set.

Additionally, the BWP-Uplink may include the UE-specific parameters of the UL BWP. The UE-specific parameter of the DL BWP is also called BWP-UplinkDedicated. For example, the UE-specific parameters include UE-specific PUSCH parameters applied to the UL BWP and/or DMRS (demodulation reference signal) parameters related to PUSCH transmission.

Here, the base station 100 may set the UE-specific parameters included in the ServingCellConfig in the RRC message for the initial DL BWP. Furthermore, the base station 100 may set UE-specific parameters included in the ServingCellConfig in the RRC message for the initial UL BWP. For example, parameters regarding SSS for monitoring PDCCH for DCI with C-RNTI, MCS-C-RNTI, and/or CS-RNTI may be set for initial DL BWP. Furthermore, UE-specific PUSCH parameters and/or DMRS-related parameters related to PUSCH transmission may be set for the initial UL BWP.

For example, the UE 30 or UE 40 receives the RRC message and acquires the information included in the RRC message. Then, the UE 30 or UE 40 is configured with the above BWP and communicates with the base station 100 using the above BWP. For example, the UE 30 or UE 40 specifies the DL BWP based on the BWP-Downlink. Further, the UE 30 or UE 40 identifies the UL BWP based on the BWP-Uplink. Furthermore, UE 30 or UE 40 may monitor PDCCH for DCI with C-RNTI, MCS-C-RNTI, and/or CS-RNTI in SSS configured using BWP-Downlink.

In addition, when UE-specific parameters are set for the initial DL BWP, the UE 30 or UE 40 performs C-RNTI, MCS-C-RNTI, etc. in the SSS set based on the UE-specific parameters in the initial DL BWP. , and/or PDCCH for DCI with CS-RNTI may be monitored.

Further, the UE 30 or UE 40 may receive downlink data (DL-SCH data) on a PDSCH scheduled by a DCI with C-RNTI, MCS-C-RNTI, and/or CS-RNTI. . Additionally, the UE 30 or UE 40 may transmit uplink data (UL-SCH data) on the PUSCH scheduled by the DCI with C-RNTI, MCS-C-RNTI, and/or CS-RNTI. . Here, the UE 30 or UE 40 may perform uplink data transmission (PUSCH transmission) and/or DMRS transmission related to PUSCH based on the UE-specific parameters included in the BWP-Uplink. . Furthermore, the UE 30 or UE 40 may perform uplink data transmission (PUSCH transmission) and/or DMRS transmission related to the PUSCH in the initial UL BWP based on UE-specific parameters.

The base station 100 may configure one or more DL BWPs for one UE in one serving cell. In this case, one DL BWP of the one or more DL BWPs is used by the UE as an Active DL BWP. For example, the RRC message includes an information element indicating the first Active DL BWP, and the UE initially uses the DL BWP indicated by the information element as the Active DL BWP. The above information element is firstActiveDownlinkBWP-Id. Furthermore, Active DL BWP can be switched. For example, the base station 100 transmits DCI including information indicating DL BWP to the UE, and the UE switches the Active DL BWP to the DL BWP indicated by the information. The DCI is a DCI (for example, DCI format 1_1) used for PDSCH scheduling, and the information is a Bandwidth Part Indicator. Further, for example, when a timer related to BWP expires, the UE switches Active DL BWP to Default DL BWP. For example, the RRC message includes an information element indicating the Default DL BWP, and the UE uses the DL BWP indicated by the information element as the Default DL BWP. The timer is bwp-InactivityTimer, and the information element is defaultDownlinkBWP-Id. Note that the switching of Active DL BWP may be further controlled by a MAC (Medium Access Control) entity.

The base station 100 may configure one or more UL BWPs for one UE in one serving cell. In this case, one UL BWP of the one or more UL BWPs is used by the UE as an Active UL BWP. For example, the RRC message includes an information element indicating the first Active UL BWP, and the UE initially uses the UL BWP indicated by the information element as the Active UL BWP. The above information element is firstActiveUplinkBWP-Id. Furthermore, Active UL BWP can be switched. For example, the base station 100 transmits DCI including information indicating the UL BWP to the UE, and the UE switches the Active UL BWP to the UL BWP indicated by the information. The DCI is a DCI (for example, DCI format 0_1) used for PUSCH scheduling, and the information is a Bandwidth Part Indicator. Note that the switching of Active DL BWP may be further controlled by the MAC entity.

For example, the plurality of DL BWPs are a maximum of four DL BWPs. For example, the plurality of UL BWPs are a maximum of four UL BWPs. Here, as described above, the base station 100 may configure SSS for each of one or more DL BWPs configured in one serving cell. Here, the one or more DL BWPs include an initial DL BWP and a UE-specific DL BWP.

(4) Frequency Band in BWP Particularly in the embodiment of the present disclosure, the frequency band used by the RedCap UE is set in the BWP used by the RedCap UE.

A DL BWP may be specified based on the BWP-Downlink, and a downlink frequency band may be set within the DL BWP. For example, when the UE-specific parameters of the DL BWP included in the BWP-Downlink include information for setting the frequency band in the downlink, the frequency band in the downlink may be set in the DL BWP. Furthermore, a UL BWP may be specified based on the BWP-Uplink, and an uplink frequency band may be set within the UL BWP. For example, when the UE-specific parameters of the UL BWP included in the BWP-Uplink include information for setting the frequency band in the uplink, the frequency band in the uplink may be set in the UL BWP.

The frequency band set within the BWP may also be called BWP. Specifically, the frequency band in the downlink may also be called DL BWP, and the frequency band in the uplink may also be called UL BWP.

Hereinafter, the frequency band in the downlink will be referred to as the DL frequency band, and the frequency band in the uplink will be referred to as the UL frequency band.

Features related to the above frequency bands according to the embodiments of the present disclosure will be described in detail later.

<2. Base station configuration>
An example of the configuration of base station 100 according to an embodiment of the present disclosure will be described with reference to FIGS. 3 and 4.

(1) Functional Configuration First, with reference to FIG. 3, an example of the functional configuration of the base station 100 according to the embodiment of the present disclosure will be described. Referring to FIG. 3, the base station 100 includes a wireless communication section 110, a network communication section 120, a storage section 130, and a processing section 140.

The wireless communication unit 110 transmits and receives signals wirelessly. For example, the wireless communication unit 110 receives a signal from a UE and transmits a signal to the UE.

The network communication unit 120 receives signals from the network and transmits signals to the network.

The storage unit 130 stores various information for the base station 100.

The processing unit 140 provides various functions of the base station 100. The processing section 140 includes an information acquisition section 141 and a communication processing section 143. Note that the processing unit 140 may further include components other than these components. That is, the processing unit 140 can perform operations other than those of these components. Specific operations of the information acquisition section 141 and the communication processing section 143 will be explained in detail later.

For example, the processing unit 140 (communication processing unit 143) communicates with the UEs (for example, UE 30, UE 40, and UE 200) via the wireless communication unit 110. For example, the processing unit 140 (communication processing unit 143) communicates with the core network node and other base stations via the network communication unit 120.

(2) Hardware Configuration Next, with reference to FIG. 4, an example of the hardware configuration of the base station 100 according to the embodiment of the present disclosure will be described. Referring to FIG. 4, the base station 100 includes an antenna 181, an RF (radio frequency) circuit 183, a network interface 185, a processor 187, a memory 189, and a storage 191.

The antenna 181 converts the signal into radio waves and radiates the radio waves into space. Further, the antenna 181 receives radio waves in space and converts the radio waves into signals. Antenna 181 may include a transmitting antenna and a receiving antenna, or may be a single antenna for transmitting and receiving. Antenna 181 may be a directional antenna and may include multiple antenna elements.

The RF circuit 183 performs analog processing of signals transmitted and received via the antenna 181. RF circuit 183 may include a high frequency filter, an amplifier, a modulator, a low pass filter, and the like.

The network interface 185 is, for example, a network adapter, and transmits signals to and receives signals from the network.

The processor 187 performs digital processing of signals transmitted and received via the antenna 181 and the RF circuit 183. The digital processing includes processing of the RAN protocol stack. Processor 187 also processes signals sent and received via network interface 185. Processor 187 may include multiple processors or may be a single processor. The plurality of processors may include a baseband processor that performs the digital processing and one or more processors that perform other processing.

The memory 189 stores programs executed by the processor 187, parameters related to the programs, and various other information. The memory 189 may include at least one of ROM (read only memory), EPROM (erasable programmable read only memory), EEPROM (electrically erasable programmable read only memory), RAM (random access memory), and flash memory. All or part of memory 189 may be included within processor 187.

The storage 191 stores various information. The storage 191 may include at least one of an SSD (solid state drive) and an HDD (hard disc drive).

The wireless communication unit 110 may be implemented by an antenna 181 and an RF circuit 183. Network communication unit 120 may be implemented by network interface 185. The storage unit 130 may be implemented by a storage 191. Processing unit 140 may be implemented by processor 187 and memory 189

Part or all of the processing unit 140 may be virtualized. In other words, part or all of the processing unit 140 may be implemented as a virtual machine. In this case, part or all of the processing unit 140 may operate as a virtual machine on a physical machine (ie, hardware) including a processor, memory, etc., and a hypervisor.

Considering the above hardware configuration, base station 100 may include a memory that stores a program (i.e., memory 189) and one or more processors that can execute the program (i.e., processor 187). , the one or more processors may execute the above program to perform the operations of the processing unit 140. The program may be a program for causing a processor to execute the operations of the processing unit 140.

<3. User equipment configuration>
An example of the configuration of the UE 200 according to the embodiment of the present disclosure will be described with reference to FIGS. 5 and 6.

(1) Functional Configuration First, an example of the functional configuration of the UE 200 according to the embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 5, the UE 200 includes a wireless communication section 210, a storage section 220, and a processing section 230.

The wireless communication unit 210 transmits and receives signals wirelessly. For example, the wireless communication unit 210 receives a signal from a base station and transmits a signal to the base station.

The storage unit 220 stores various information for the UE 200.

The processing unit 230 provides various functions of the UE 200. The processing section 230 includes an information acquisition section 231 and a communication processing section 233. Note that the processing unit 230 may further include components other than these components. That is, the processing unit 230 can perform operations other than those of these components. Specific operations of the information acquisition unit 231 and communication processing unit 233 will be explained in detail later.

For example, the processing unit 230 (communication processing unit 233) communicates with a base station (eg, base station 100) via the wireless communication unit 210.

(2) Hardware Configuration Next, with reference to FIG. 6, an example of the hardware configuration of the UE 200 according to the embodiment of the present disclosure will be described. Referring to FIG. 6, the UE 200 includes an antenna 281, an RF circuit 283, a processor 285, a memory 287, and a storage 289.

The antenna 281 converts the signal into radio waves and radiates the radio waves into space. Further, the antenna 281 receives radio waves in space and converts the radio waves into signals. Antenna 281 may include a transmit antenna and a receive antenna, or may be a single antenna for transmitting and receiving. Antenna 281 may be a directional antenna and may include multiple antenna elements.

The RF circuit 283 performs analog processing of signals transmitted and received via the antenna 281. RF circuit 283 may include a high frequency filter, an amplifier, a modulator, a low pass filter, and the like.

The processor 285 performs digital processing of signals transmitted and received via the antenna 281 and the RF circuit 283. The digital processing includes processing of the RAN protocol stack. Processor 285 may include multiple processors or may be a single processor. The plurality of processors may include a baseband processor that performs the digital processing and one or more processors that perform other processing.

The memory 287 stores programs executed by the processor 285, parameters related to the programs, and various other information. Memory 287 may include at least one of ROM, EPROM, EEPROM, RAM, and flash memory. All or part of memory 287 may be included within processor 285.

The storage 289 stores various information. Storage 289 may include at least one of an SSD and an HDD.

The wireless communication unit 210 may be implemented by an antenna 281 and an RF circuit 283. Storage unit 220 may be implemented by storage 289. Processing unit 230 may be implemented by processor 285 and memory 287.

The processing unit 230 may be implemented by an SoC (System on Chip) including a processor 285 and a memory 287. The SoC may include the RF circuit 283, and the wireless communication unit 210 may also be implemented by the SoC.

Considering the above hardware configuration, the UE 200 may include a memory that stores a program (i.e., the memory 287) and one or more processors that can execute the program (i.e., the processor 285). One or more processors may execute the above program to perform the operations of the processing unit 230. The program may be a program for causing a processor to execute the operations of the processing unit 230.

<4. Operation example>
Examples of operations of the base station 100 and the UE 200 according to the embodiment of the present disclosure will be described with reference to FIGS. 7 to 12.

The base station 100 (information acquisition unit 141) acquires the RRC message, and the base station 100 (communication processing unit 143) transmits the RRC message to the UE 200. In particular, in the embodiment of the present disclosure, the UE 200 is a RedCap UE, and the RRC message includes first information indicating a BWP used by the UE 200, and a frequency band set within the BWP, which is set by the UE 200. and second information indicating the frequency band to be used.

The UE 200 (communication processing unit 233) receives the RRC message transmitted by the base station 100, and the UE 200 (information acquisition unit 231) receives the first information and second information included in the RRC message. get.

This allows for example to further configure frequency bands within the BWP for RedCap UEs. Therefore, for example, a RedCap UE can communicate with the base station 100 at a low peak data rate using a frequency band within the BWP.

For example, the UE 200 (communication processing unit 233) is set with the above BWP and the above frequency band, and communicates with the base station 100 using the above BWP and the above frequency band.

(1) RRC Message For example, the above RRC message is an RRC Reconfiguration message. That is, the base station 100 (communication processing unit 143) transmits an RRC Reconfiguration message including the first information and the second information to the UE 200.

For example, the base station 100 (information acquisition unit 141) acquires the RRC message by generating the RRC message.

(2) BWP and frequency band (2-1) BWP
The BWP used by the UE 200 is RRC configured BWP. The frequency band used by the UE 200 is set in the RRC configured BWP.

Note that the above frequency band may also be called BWP on the premise that the above frequency band is distinguished from existing BWP. The existing BWPs are RRC Configured BWP, initial BWP, and RedCap-specific initial BWP. As an example, the frequency band may be called BWP for Rel-18 RedCap UE.

(2-2) Downlink (DL) and uplink (UL)
For example, the BWP includes DL BWP used by UE 200 and UL BWP used by UE 200.

For example, the frequency band is a DL frequency band set within the DL BWP and includes the DL frequency band used by the UE 200. Further, the frequency band is a UL frequency band set within the UL BWP, and includes the UL frequency band used by the UE 200.

(2-3) Bandwidth The above frequency band is narrower than the above BWP. For example, the frequency band is a frequency band of 5 MHz or less in FR1. As mentioned above, FR1 is in the frequency range from 450 MHz to 6000 MHz.

Referring to FIG. 7, for example, the BWP 51 used by the UE 200 is set, and furthermore, the frequency band 53 used by the UE 200 is set within the BWP 51. For example, the bandwidth of the BWP 51 is 20 MHz, and the bandwidth of the frequency band 53 is 5 MHz. BWP 51 and frequency band 53 may be DL BWP and DL frequency band, or may be UL BWP and UL frequency band.

(2-4) Subcarrier spacing For example, the subcarrier spacing of the above frequency band is the same as the subcarrier spacing of the above BWP. That is, the subcarrier spacing used within the frequency band is the same as the subcarrier spacing used within the BWP.

For example, the subcarrier spacing of the DL frequency band is the same as the subcarrier spacing of the DL BWP, and the subcarrier spacing of the UL frequency band is the same as the subcarrier spacing of the UL BWP.

(2-5) Applications -SSB and CORESET#0
For example, the initial DL BWP is the initial DL BWP used by the RedCap UE for reception of SS/PBCH (synchronization signal/physical broadcast channel) block and CORESET (control resource set) #0. SS/PBCH block is also called SSB. The SS/PBCH block includes a PSS (primary synchronization signal), an SSS (secondary synchronization signal), and/or a PBCH (physical broadcast channel). Further, the SS/PBCH block includes a Cell-Defining SSB (CD-SSB) related to SIB1 and/or a Non Cell-Defining SSB (NCD-SSB) not related to SIB1. PBCH is used for transmitting MIB (master information block). The MIB may include information indicating CORESET #0 and/or information indicating SSS #0. As described above, SSS#0 is also called Type0-PDCCH CSS Set, and CORESET#0 is a CORESET for SSS#0.

CORESET #0 is a CORESET used to transmit PDCCH for SIB1 scheduling. Therefore, reception of CORESET #0 can also be said to be reception of PDCCH transmitted by CORESET #0. Similarly, SSS #0 is the SSS used to transmit PDCCH for SIB1 scheduling. The PDCCH includes DCI for SIB1 scheduling. Here, the DCI for SIB1 scheduling is a DCI with SI-RNTI.

The UE 200 (communication processing unit 233) monitors a set of PDCCH candidates using one or more CORESETs in the DL BWP in the serving cell in which PDCCH monitoring is configured, according to the corresponding search space set. Here, monitoring may refer to attempting to decode each of the PDCCH candidates according to the monitored DCI (DCI format) (also referred to as blind decoding). For example, the UE 200 (communication processing unit 233) receives the SS/PBCH block using the above-mentioned initial DL BWP, and monitors (receives) the PDCCH with CORESET #0 and/or SSS #0.
- Physical shared channel - Reception in frequency band The above frequency band is a frequency band used by UE 200 for at least one of receiving and transmitting a physical shared channel. That is, the UE 200 (communication processing unit 233) receives or transmits the physical shared channel using the frequency band.

For example, the physical shared channels include PDSCH (physical downlink shared channel) and PUSCH (physical uplink shared channel). That is, the DL frequency band included in the frequency band is a DL frequency band used by the UE 200 for receiving the PDSCH, and the UL frequency band included in the frequency band is the DL frequency band used by the UE 200 for receiving the PUSCH. This is the UL frequency band used by

For example, the physical shared channel may be C-RNTI (cell radio network temporary identifier), MCS-C-RNTI (modulation and coding scheme cell radio network temporary identifier), and/or CS-RNTI (configured scheduling radio network).　temporary　identifier ) with a physical shared channel scheduled using DCI.

For example, the UE 200 (communication processing unit 233) uses the above frequency band to receive or transmit a physical shared channel scheduled using a DCI with C-RNTI, MCS-C-RNTI, or CS-RNTI. .

For example, the UE 200 (communication processing unit 233) may perform reception on the PDSCH scheduled using the C-RNTI, MCS-C-RNTI, and/or DCI with CS-RNTI in the above DL frequency band. good. Further, the UE 200 (communication processing unit 233) performs transmission on the PUSCH scheduled using the C-RNTI, MCS-C-RNTI, and/or DCI with CS-RNTI in the above UL frequency band. Good too.

Here, as described above, the UE 200 (communication processing unit 233) uses the C-RNTI, the MCS-C-RNTI, and/or the DCI with the CS-RNTI (that is, the DCI used for PDSCH scheduling, and/or , PDCCH (DCI used for PUSCH scheduling) may be performed in the UE-specific DL BWP. That is, the UE 200 (communication processing unit 233) uses the C-RNTI, MCS-C-RNTI, and/or CS- in the SSS (USS and/or CSS) configured for the UE-specific DL BWP. DCI with RNTI may be monitored.

The UE 200 (communication processing unit 233) performs reception on the PDSCH scheduled by the DCI with C-RNTI, MCS-C-RNTI, and/or CS-RNTI using the DL frequency band set in the UE-specific DL BWP. It may be executed in In addition, the UE 200 (communication processing unit 233) transmits transmission on the PUSCH scheduled by the DCI with the C-RNTI, MCS-C-RNTI, and/or CS-RNTI using the UL configured in the UE-specific UL BWP. It may also be performed in a frequency band.

For example, DCI used for PDSCH scheduling with C-RNTI, MCS-C-RNTI, and/or CS-RNTI may include information indicating frequency domain resource assignment. The information indicating resource allocation in the frequency domain is also called a field indicating resource allocation in the frequency domain. For example, the information indicating resource allocation in the frequency domain indicates PDSCH resource allocation. Here, the number of bits of information indicating resource allocation in the frequency domain may be determined based on the size of the Active DL BWP (i.e., the number of resource blocks of the Active DL BWP, also referred to as the bandwidth of the Active DL BWP). good. A resource block is also called a physical resource block. That is, the UE 200 (communication processing unit 233) may determine the number of bits of information indicating resource allocation in the frequency domain based on the size of the Active DL BWP. Here, as described above, the size of the Active DL BWP (that is, the initial DL BWP and/or the UE-specific DL BWP) is determined by the parameters indicating the position and bandwidth of the Active DL BWP, and/or the Active DL BWP. may be determined based on a parameter indicating the subcarrier spacing.

Here, the number of bits of information indicating resource allocation in the frequency domain included in the DCI used for PDSCH scheduling with C-RNTI, MCS-C-RNTI, and/or CS-RNTI is It may be determined based on the size (i.e., the number of resource blocks in the DL frequency band, also referred to as the bandwidth of the DL frequency band). That is, the UE 200 (communication processing unit 233) may determine the number of bits of information indicating resource allocation in the frequency domain based on the size of the DL frequency band. For example, the size of the DL frequency band may be determined based on parameters indicating the position and bandwidth of the DL frequency band and/or parameters indicating the subcarrier spacing of the DL frequency band.

For example, when the DL frequency band is not set, the UE 200 (communication processing unit 233) sets the number of bits of information indicating resource allocation in the frequency domain included in the DCI used for PDSCH scheduling to the Active DL BWP. It may also be determined based on size. Furthermore, when a DL frequency band is set, the UE 200 (communication processing unit 233) may determine the number of bits of information indicating resource allocation in the frequency band based on the size of the DL frequency band. . That is, depending on whether a DL frequency band is set, the UE 200 (communication processing unit 233) determines the number of bits of information indicating resource allocation in the frequency domain based on the size of Active DL BWP, or determines the number of bits of information indicating resource allocation in the frequency domain based on the size of Active DL BWP, or It may also be specified whether the decision is made based on the size of the band.

Here, the number of bits of information indicating resource allocation in the frequency domain (i.e., PDSCH resource allocation) included in the DCI used for PDSCH scheduling with SI-RNTI, RA-RNTI, and/or CS-RNTI may be determined based on the size of CORESET #0 (that is, the number of resource blocks of CORESET #0, also referred to as the bandwidth of CORESET #0). In addition, the number of bits of information indicating resource allocation in the frequency domain included in the DCI used for PDSCH scheduling with SI-RNTI, RA-RNTI, and/or CS-RNTI is based on the size of Active DL BWP. may also be determined. Furthermore, the number of bits of information indicating resource allocation in the frequency domain included in the DCI used for PDSCH scheduling with SI-RNTI, RA-RNTI, and/or CS-RNTI is based on the size of the DL frequency band. may also be determined.

That is, the UE 200 (communication processing unit 233) configures reception on the PDSCH scheduled using DCI with SI-RNTI, RA-RNTI, and/or P-RNTI in the DL BWP in the above-mentioned DL frequency band. It may also be performed in the DL frequency band specified. As described above, the UE 200 (communication processing unit 233) may perform monitoring of PDCCH for DCI with SI-RNTI, RA-RNTI, and/or P-RNTI in DL BWP.

Further, the DCI used for PUSCH scheduling with the C-RNTI, MCS-C-RNTI, and/or CS-RNTI may include information indicating resource allocation in the frequency domain. For example, the information indicating resource allocation in the frequency domain indicates resource allocation for PUSCH. Here, the number of bits of information indicating resource allocation in the frequency domain may be determined based on the size of the Active UL BWP (that is, the number of resource blocks of the Active UL BWP, also referred to as the bandwidth of the Active UL BWP). good. That is, the UE 200 (communication processing unit 233) may determine the number of bits of information indicating resource allocation in the frequency domain based on the size of the Active UL BWP. Here, as described above, the size of the Active UL BWP may be determined based on parameters indicating the position and bandwidth of the Active UL BWP and/or parameters indicating the subcarrier interval of the Active UL BWP.

Here, the number of bits of information indicating resource allocation in the frequency domain included in the DCI used for PUSCH scheduling with C-RNTI, MCS-C-RNTI, and/or CS-RNTI is It may be determined based on the size (i.e., the number of resource blocks in the UL frequency band). That is, the UE 200 (communication processing unit 233) may determine the number of bits of information indicating resource allocation in the frequency domain based on the size of the UL frequency band. For example, the size of the UL frequency band may be determined based on parameters indicating the location and bandwidth of the UL frequency band and/or parameters indicating the subcarrier spacing of the UL frequency band.

For example, if the UL frequency band is not set, the UE 200 (communication processing unit 233) sets the number of bits of information indicating resource allocation in the frequency domain included in the DCI used for PUSCH scheduling to the size of the Active UL BWP. may be determined based on. Furthermore, when a UL frequency band is set, the UE 200 (communication processing unit 233) may determine the number of bits of information indicating resource allocation in the frequency band based on the size of the UL frequency band. That is, depending on whether a UL frequency band is set, the UE 200 (communication processing unit 233) determines the number of bits of information indicating resource allocation in the frequency domain based on the size of the Active UL BWP, or It may also be specified whether the decision is made based on the size of the band.　

This allows for example physical shared channel reception or transmission at low peak data rates.

--Reception in BWP For example, the above BWP is scheduled using DCI with SI-RNTI (system information radio network temporary identifier), P-RNTI (paging radio network temporary identifier), and/or RA-RNTI. This is the BWP that is further used by the UE 200 for receiving the PDSCH. That is, the DL BWP included in the BWP is the DL frequency used by the UE 200 to receive the PDSCH scheduled using DCI with SI-RNTI, P-RNTI, and/or RA-RNTI. Bandwidth.

For example, the UE 200 (communication processing unit 233) uses the above BWP to receive a PDSCH scheduled using SI-RNTI, P-RNTI, and/or DCI with RA-RNTI. That is, the UE 200 (communication processing unit 233) uses the DL BWP included in the BWP to determine the PDSCH scheduled using the SI-RNTI, P-RNTI, and/or DCI with RA-RNTI. receive.

In other words, the above DL BWP is a DL BWP that is further used by the UE 200 for receiving SIB and paging messages. The UE 200 (communication processing unit 233) receives the SIB and paging message using the DL BWP.

For example, the UE 200 (communication processing unit 233) may perform reception on the PDSCH scheduled using DCI with SI-RNTI, P-RNTI, and/or RA-RNTI in the DL BWP. That is, the UE 200 (communication processing unit 233) may receive the SIB1 message in the DL BWP using the PDSCH scheduled using the DCI with SI-RNTI. Further, the UE 200 (communication processing unit 233) may receive a random access response in the above DL BWP using a PDSCH scheduled using a DCI with RA-RNTI. Further, the UE 200 (communication processing unit 233) may receive a paging message in the above DL BWP using a PDSCH scheduled using a DCI with P-RNTI.

This allows, for example, existing transmission techniques for SIB and paging messages to be used without modification.

--Other RNTIs
Physical shared channels scheduled using DCI with other RNTIs may also be received or transmitted using either the frequency band or the BWP. The other RNTI may include RA-RNTI (random access radio network temporary identifier).

--Physical shared channel scheduled using RNTI In the above description, "physical shared channel scheduled using DCI with RNTI" refers more specifically to cyclic redundancy (CRC) scrambled by RNTI. check) is a physical shared channel scheduled using DCI with parity bits added. The DCI is transmitted on a PDCCH (physical downlink control channel).

- Physical control channel --PDCCH
For example, the above BWP is a BWP used by the UE 200 for receiving PDCCH. That is, the DL BWP included in the BWP is the DL BWP used by the UE 200 for receiving the PDCCH.

For example, the UE 200 (communication processing unit 233) receives PDCCH using the above BWP. That is, the UE 200 (communication processing unit 233) receives the PDCCH using the DL BWP included in the BWP.

This allows, for example, the existing transmission method of PDCCH to be used without modification.

--PUCCH
For example, the above BWP is a BWP used by the UE 200 for transmitting a PUCCH (physical uplink control channel). That is, the UL BWP included in the BWP is the UL BWP used by the UE 200 for transmitting the PUCCH.

For example, the UE 200 (communication processing unit 233) uses the above BWP to transmit PUCCH. That is, the UE 200 (communication processing unit 233) transmits the PUCCH using the UL BWP included in the BWP.

This allows, for example, the existing transmission method of PUCCH to be used without modification.

- Other signals Other signals than the physical shared channel and the physical control channel may also be received or transmitted using either the frequency band or the BWP. The other signal may include a PRACH (physical random access channel), ie, a random access preamble. The other signals may include an SRS (sounding reference signal).

Here, the random access procedure includes a contention-based random access procedure and/or a contention-free random access procedure. Contention-free random access procedures are also called non-contention-based random access procedures. For example, the contention-free random access procedure may be triggered by the frequency resource allocation field included in the DCI with C-RNTI (DCI format 1_0) being set to all 1 (also referred to as PDCCH order). Furthermore, in the contention-free random access procedure, a random access preamble is indicated (also called message 0) using information included in the DCI (DCI format 1_0) with C-RNTI. Here, the random access preamble instructed using the information included in the DCI (DCI format 1_0) accompanied by the C-RNTI is also called a dedicated preamble.

Here, the UE 200 (communication processing unit 233) may execute the contention-free random access procedure in the DL frequency band and/or the UL frequency band. For example, when a random access procedure (contention-free random access procedure) is instructed using DCI (PDCCH order) with C-RNTI, the UE 200 (communication processing unit 233) uses the DL frequency set in DL BWP. A random access procedure (contention-free random access procedure) may be performed in the band and/or the UL frequency band set in the UL BWP.

For example, when a random access procedure (contention-free random access procedure) is instructed using DCI (PDCCH order) with C-RNTI, the UE 200 (communication processing unit 233) uses the UL frequency band set in UL BWP. A random access preamble may be sent (also referred to as message 1). Further, the UE 200 (communication processing unit 233) may receive a random access response (also referred to as message 2) on the PDSCH in the DL frequency band set in the DL BWP. As described above, the UE 200 (communication processing unit 233) may perform monitoring of PDCCH for DCI (PDCCH order) with C-RNTI in the UE-specific DL BWP. That is, the UE 200 (communication processing unit 233) may monitor DCI (PDCCH order) accompanied by C-RNTI in the SSS (USS and/or CSS) configured for the UE-specific DL BWP. .

Furthermore, in the random access procedure (contention-based random access procedure and/or contention-free random access procedure), the UE 200 (communication processing unit 233) may transmit a random access preamble in the initial UL BWP. (Also called message 1). Furthermore, as described above, the UE 200 (communication processing unit 233) may receive a random access response (also referred to as message 2) on the PDSCH in the initial DL BWP. Here, the UE 200 (communication processing unit 233) performs transmission on the PUSCH (transmission on the UL-SCH) in the above-mentioned initial UL BWP based on the uplink grant (also called random access response grant) included in the random access response. may be executed (also referred to as message 3). Further, the UE 200 (communication processing unit 233) may receive contention resolution (also referred to as message 4) in the PDSCH in the initial DL BWP in the initial DL BWP. That is, the UE 200 (communication processing unit 233) may execute the random access procedure in the initial DL BWP specified based on the initialDownlinkBWP-RedCap-r17 or the initialDownlinkBWP. Further, the UE 200 (communication processing unit 233) may execute a random access procedure in the initial UL BWP specified based on the initialUplinkBWP-RedCap-r17 or the initialUplinkBWP. That is, when the UE 200 (communication processing unit 233) is instructed to perform a random access procedure (contention-free random access procedure) using DCI (PDCCH order) with C-RNTI, the UE 200 (communication processing unit 233) performs initial DL BWP and/or A random access procedure (contention-free random access procedure) may be executed in the initial UL BWP.

(2-6) Search Space For example, the RRC message further includes information indicating multiple types of search spaces for the BWP.

For example, at least one search space of the plurality of types of search spaces is a search space that is monitored by the UE 200 for reception of a DCI used to schedule a physical shared channel within the frequency band. .

As an example, the at least one search space includes a USS (UE-specific search space). USS is a search space monitored by UE 200 for reception of DCI with CRC parity bits scrambled by C-RNTI, MCS-C-RNTI or CS-RNTI.

On the other hand, for example, other search spaces among the plurality of types of search spaces are search spaces monitored by the UE 200 for reception of other DCIs.

As an example, the other search spaces include Type0-PDCCH CSS (common search space), Type0A-PDCCH CSS, and Type2-PDCCH CSS. Type0-PDCCH CSS and Type0A-PDCCH CSS are search spaces monitored by UE 200 for reception of DCI with CRC parity bits scrambled by SI-RNTI. Type 2-PDCCH CSS is a search space monitored by UE 200 for reception of DCI with CRC parity bits scrambled by P-RNTI.

Each of the Type 1-PDCCH CSS and the Type 3-PDCCH CSS may also be included in the at least one search space or the other search space. Furthermore, each of the Type0B-PDCCH CSS, Type1A-PDCCH CSS, and Type2A-PDCCH CSS may also be included in the at least one search space or the other search space.

(3) First information As described above, for example, the BWP includes DL BWP used by UE 200 and UL BWP used by UE 200. For example, the first information includes a first information element indicating the DL BWP and a second information element indicating the UL BWP.

For example, the first information includes a parameter indicating the location and bandwidth of the BWP, a parameter indicating a subcarrier interval of the BWP, and a parameter indicating a cyclic prefix of the BWP.

For example, the RRC message includes the first information for each of the two or more BWPs used by the UE 200.

Referring to FIG. 8, for example, the first information element is BWP-Downlink included in downlinkBWP-ToAddModList in ServingCellConfig. downlinkBWP-ToAddModList includes BWP-Downlink for each of two or more DL BWPs used by UE 200. BWP-Downlink includes, as generic parameters, locationAndBandwidth indicating the location and bandwidth of the DL BWP, subcarrierSpacing indicating the subcarrier spacing of the DL BWP, and c indicating the cyclic prefix of the DL BWP. yclicPrefix.

Referring to FIG. 9, for example, the second information element is BWP-Uplink included in uplinkBWP-ToAddModList in UplinkConfig. uplinkBWP-ToAddModList includes BWP-Uplink for each of two or more UL BWPs used by UE 200. BWP-Uplink includes, as generic parameters, locationAndBandwidth indicating the location and bandwidth of the UL BWP, subcarrierSpacing indicating the subcarrier spacing of the UL BWP, and cyc indicating the cyclic prefix of the UL BWP. licPrefix.

(4) Second information As described above, for example, the frequency band is a DL frequency band set within the DL BWP, and the DL frequency band used by the UE 200 and the DL frequency band set within the UL BWP are The UL frequency band to be set includes the UL frequency band used by the UE 200. For example, the second information includes a third information element indicating the DL frequency band and a fourth information element indicating the UL frequency band.

For example, the second information is included in the first information. More specifically, for example, the third information element included in the second information is included in the first information element included in the first information, and is included in the second information. The fourth information element is included in the second information element included in the first information.

For example, the second information includes parameters indicating the position and bandwidth of the frequency band. More specifically, for example, the third information element included in the second information includes a parameter indicating the position and bandwidth of the DL frequency band, and the fourth information element included in the second information includes a parameter indicating the position and bandwidth of the DL frequency band. The information element includes parameters indicating the location and bandwidth of the UL frequency band.

Referring to FIG. 10, for example, the first information element is BWP-Downlink included in the downlinkBWP-ToAddModList in ServingCellConfig, and the third information element is the DownlinkBWP-RedCap- included in the BWP-Downlink. It is r18. DownlinkBWP-RedCap-r18 is locationAndBandwidth indicating the position and bandwidth of the DL frequency band.

Referring to FIG. 11, for example, the second information element is BWP-Uplink included in uplinkBWP-ToAddModList in UplinkConfig,
The third information element is UplinkBWP-RedCap-r18 included in the BWP-Uplink. UplinkBWP-RedCap-r18 is locationAndBandwidth indicating the position and bandwidth of the UL frequency band.

For example, the second information does not include a parameter indicating the subcarrier interval of the frequency band and a parameter indicating the cyclic prefix of the frequency band.

(5) Subcarrier spacing and cyclic prefix As described above, for example, the subcarrier spacing of the frequency band is the same as the subcarrier spacing of the BWP. That is, the subcarrier spacing of the DL frequency band is the same as the subcarrier spacing of the DL BWP, and the subcarrier spacing of the UL frequency band is the same as the subcarrier spacing of the UL BWP.

Also, for example, the cyclic prefix of the frequency band is the same as the cyclic prefix of the BWP. That is, the cyclic prefix of the DL frequency band is the same as the cyclic prefix of the DL BWP, and the cyclic prefix of the UL frequency band is the same as the cyclic prefix of the UL BWP.

Therefore, the UE 200 uses subcarrier Spacing and cyclicPrefix included in the first information element in the first information not only as the subcarrier spacing and cyclic prefix of the DL BWP, but also as the subcarrier spacing and cyclic prefix of the DL frequency band. May also be used as carrier spacing and cyclic prefix. Further, the UE 200 uses the subcarrier Spacing and cyclicPrefix included in the second information element in the first information not only as the subcarrier spacing and cyclic prefix of the UL BWP, but also as the subcarrier spacing and cyclic prefix of the UL frequency band. May also be used as carrier spacing and cyclic prefix.

Note that the subcarrier spacing of the BWP is the subcarrier spacing used within the BWP, and the subcarrier spacing of the frequency band is the subcarrier spacing used within the frequency band. Further, the cyclic prefix of the BWP is a cyclic prefix used within the BWP, and the cyclic prefix of the frequency band is a cyclic prefix used within the frequency band. It's a fix.

(6) Process Flow An example of the process according to the embodiment of the present disclosure will be described with reference to FIG. 12.

The base station 100 (information acquisition unit 141) acquires the RRC message (S410). The RRC message includes first information indicating the BWP used by the UE 200 and second information indicating the frequency band set within the BWP and used by the UE 200. For example, the RRC message is an RRC Reconfiguration message.

The base station 100 (communication processing unit 143) transmits the above RRC message to the UE 200 (S420). The UE 200 (communication processing unit 233) receives the RRC message transmitted by the base station 100.

The UE 200 (information acquisition unit 231) acquires the first information and the second information included in the RRC message (S430).

Note that the UE 200 (communication processing unit 233) is set with the above BWP and the above frequency band, and communicates with the base station 100 using the above BWP and the above frequency band, for example.

<5. Modified example>
First to ninth modifications according to the embodiment of the present disclosure will be described with reference to FIGS. 13 to 23. Note that two or more of the first to ninth modifications may be combined.

(1) First modification: Second information In the above-described example of the embodiment of the present disclosure, the second information includes parameters indicating the position and bandwidth of the frequency band. It does not include a parameter indicating the subcarrier interval and a parameter indicating the cyclic prefix of the frequency band. However, the second information according to the embodiment of the present disclosure is not limited to this example.

As a first modification, the second information may further include a parameter indicating a subcarrier interval of the frequency band and a parameter indicating a cyclic prefix of the frequency band.

For example, the third information element DownlinkBWP-RedCap-r18 included in the second information includes not only locationAndBandwidth indicating the position and bandwidth of the DL frequency band, but also the subcarrier interval of the DL frequency band. and cyclicPrefix indicating the cyclic prefix of the DL frequency band. In this case, DownlinkBWP-RedCap-r18 may be an information element called BWP including locationAndBandwidth, subcarrierSpacing, and cyclicPrefix.

For example, the fourth information element UplinkBWP-RedCap-r18 included in the second information includes not only locationAndBandwidth indicating the position and bandwidth of the UL frequency band, but also the subcarrier spacing of the UL frequency band. and cyclicPrefix indicating the cyclic prefix of the UL frequency band. In this case, UplinkBWP-RedCap-r18 may be an information element called BWP including locationAndBandwidth, subcarrierSpacing, and cyclicPrefix.

As mentioned above as an example of an embodiment of the present disclosure, the subcarrier spacing of the frequency band may be the same as the subcarrier spacing of the BWP, and the cyclic prefix of the frequency band may be the same as the subcarrier spacing of the frequency band. It may be the same as the above cyclic prefix of BWP. In this case, the base station 100 sets the value of subcarrierSpacing and the value of cyclicPrefix included in the third information element to be the same as the value of subcarrierSpacing and cyclicPrefix included in the first information element. You may. Furthermore, the base station 100 may set the value of subcarrierSpacing and the value of cyclicPrefix included in the fourth information element to be the same as the value of subcarrierSpacing and cyclicPrefix included in the second information element. good.

(2) Second Modification: Second Information In the above-described example of the embodiment of the present disclosure, the second information includes a parameter indicating the position and bandwidth of the frequency band. However, the second information according to the embodiment of the present disclosure is not limited to this example.

As a second modification, the second information may indicate an offset of the start position of the frequency band with respect to the start position of the BWP, and a bandwidth of the frequency band.

The second information may indicate the offset by the number of resource blocks (RB) included in the offset, and may indicate the bandwidth of the frequency band by the number of RBs included in the frequency band. . Since the width of an RB depends on the subcarrier spacing, the offset and the bandwidth of the frequency band may depend on the subcarrier spacing of the frequency band. A specific example regarding this point will be explained later.

The third information element included in the second information may indicate an offset of the start position of the DL frequency band with respect to the start position of the DL BWP, and a bandwidth of the DL frequency band. The fourth information element included in the second information may indicate an offset of a starting position of the UL frequency band with respect to a starting position of the UL BWP, and a bandwidth of the UL frequency band.

Referring to FIG. 13, similarly to FIG. 7, the BWP 51 used by the UE 200 and the frequency band 53 used by the UE 200 are shown. For example, the second information may indicate an offset 61 of the start position of the frequency band 53 with respect to the start position of the BWP 51 and a bandwidth 63 of the frequency band 53. BWP 51 and frequency band 53 may be DL BWP and DL frequency band, or may be UL BWP and UL frequency band.

Referring to FIG. 14, for example, the third information element may be DownlinkBWP-RedCap-r18 included in BWP-Downlink. DownlinkBWP-RedCap-r18 may include startRBoffset indicating the offset of the start position of the DL frequency band with respect to the start position of the DL BWP, and sizeofRBs indicating the bandwidth of the DL frequency band.

Referring to FIG. 15, for example, the fourth information element may be UplinkBWP-RedCap-r18 included in BWP-Uplink. UplinkBWP-RedCap-r18 may include startRBoffset indicating the offset of the start position of the UL frequency band with respect to the start position of the UL BWP, and sizeofRBs indicating the bandwidth of the UL frequency band.

Note that the offset and the bandwidth indicated by the number of RBs in the second information may be determined based on the maximum bandwidth of the UE 200 and the subcarrier spacing (SCS) of the BWP. . As a specific example, the bandwidth may be expressed by the number of RBs as follows.
・When maximum bandwidth = 3MHz, SCS = 15kHz: Bandwidth = 15RB
・When maximum bandwidth = 3MHz, SCS = 30kHz: Bandwidth = 8RB
・When maximum bandwidth = 4MHz, SCS = 15kHz: Bandwidth = 20RB
・When maximum bandwidth = 4MHz, SCS = 30kHz: Bandwidth = 10RB
・When maximum bandwidth = 5MHz, SCS = 15kHz: Bandwidth = 25RB
・When maximum bandwidth = 5MHz, SCS = 30kHz: Bandwidth = 12RB

Note that the maximum bandwidth is, for example, the maximum bandwidth when transmitting and receiving specific information (for example, user data, etc.).

The second modification of the embodiment of the present disclosure has been described above. According to the second modification, for example, it is possible to reduce the amount of the second information while enabling flexible setting of the frequency band.

(3) Third Modification: Second Information In the above-described example of the embodiment of the present disclosure, the second information includes a parameter indicating the position and bandwidth of the frequency band. However, the second information according to the embodiment of the present disclosure is not limited to this example.

As a third modification, the BWP used by the UE 200 may include two or more frequency band candidates for the UE 200. The second information may indicate one of the two or more frequency band candidates as the frequency band used by the UE 200. Furthermore, the two or more frequency band candidates may be predetermined for the BWP.

The BWP may be composed of the two or more frequency band candidates, and the two or more frequency band candidates do not need to overlap with each other. That is, the two or more frequency band candidates may be obtained by dividing the BWP.

Referring to FIG. 16, similar to FIG. 7, the BWP 51 used by the UE 200 is shown. For example, frequency band candidates 71, 73, 75, and 77 may be predetermined for the BWP 51, and the second information may include one of the frequency band candidates 71, 73, 75, and 77 in the frequency band. It may also be shown as As an example, the bandwidth of the BWP 51 may be 20 MHz, and the bandwidth of each of the frequency band candidates 71, 73, 75, and 77 may be 5 MHz.

Referring to FIG. 17, similarly to FIG. 7, the BWP 51 used by the UE 200 is shown. For example, frequency band candidates 81, 83, 85, 87, 89 may be predetermined for the BWP 51, and the second information may be one of the frequency band candidates 81, 83, 85, 87, 89. may be indicated as the above frequency band. As an example, the bandwidth of the BWP 51 may be 20 MHz, and the bandwidth of each of the frequency band candidates 81, 83, 85, 87, and 89 may be 4 MHz.

The two or more frequency band candidates may each have different identification information, and the second information may include identification information of one of the two or more frequency band candidates. As an example, referring to FIG. 17, frequency band candidates 71, 73, 75, and 77 may each have an ID, and the second information is the frequency band candidates 71, 73, 75, and 77. It may include one ID.

Naturally, each of the two or more frequency band candidates has a bandwidth equal to or less than the maximum bandwidth of the UE 200. The two or more frequency band candidates may be determined in advance for each maximum bandwidth. For example, for a maximum bandwidth of 5 MHz, a set of 5 MHz frequency band candidates 71, 73, 75, and 77 as shown in FIG. 16 may be determined in advance. For example, for a maximum bandwidth of 4 MHz, a set of 4 MHz frequency band candidates 81, 83, 85, 87, and 89 as shown in FIG. 17 may be determined in advance. UE 200 may select a set of frequency band candidates corresponding to the maximum bandwidth of UE 200. Note that the maximum bandwidth may be the maximum bandwidth when transmitting and receiving specific information (for example, user data, etc.).

The above two or more frequency band candidates do not necessarily have to have the same bandwidth. For example, the two or more frequency band candidates may include one or more frequency band candidates with the same bandwidth and one frequency band candidate with a different bandwidth from the one or more frequency band candidates. good.

Referring to FIG. 18, similar to FIG. 7, the BWP 51 used by the UE 200 is shown. For example, the frequency band candidates 90, 91, 92, 93, 94, 95, 96 may be predetermined for the BWP 51, and the second information may include the frequency band candidates 90, 91, 92, 93, 94, One of 95 and 96 may be indicated as the frequency band. As an example, the bandwidth of the BWP 51 may be 20 MHz, the bandwidth of each of the frequency band candidates 90, 91, 92, 93, 94, and 95 may be 3 MHz, and the bandwidth of the frequency band candidate 96 may be 2 MHz. .

Referring to FIG. 19, the BWP 55 used by the UE 200 is shown. For example, frequency band candidates 97, 98, and 99 may be predetermined for the BWP 55, and the second information may indicate one of the frequency band candidates 97, 98, and 99 as the frequency band. good. As an example, the bandwidth of the BWP 55 may be 10 MHz, the bandwidth of each of the frequency band candidates 91 and 93 may be 4 MHz, and the bandwidth of the frequency band candidate 95 may be 2 MHz.

Note that the two or more frequency band candidates may be determined in advance for each set of maximum bandwidth and BWP subcarrier interval. Thereby, the bandwidth of each of the two or more frequency band candidates may be accurately represented by the number of RBs.

The third modification of the embodiment of the present disclosure has been described above. According to the third modification, for example, the amount of the second information can be significantly reduced.

(4) Fourth Modification: Second Information In the third modification of the embodiment of the present disclosure, the two or more frequency band candidates are predetermined for the BWP. However, frequency band candidates according to embodiments of the present disclosure are not limited to this example.

As a fourth modification, the two or more frequency band candidates may not be determined in advance, but may be determined based on the maximum bandwidth of the UE 200. The UE 200 may determine the two or more frequency band candidates based on the maximum bandwidth of the UE 200. Note that the maximum bandwidth may be the maximum bandwidth when transmitting and receiving specific information (for example, user data, etc.).

As an example, if the maximum bandwidth of the UE 200 is 5 MHz, the two or more frequency band candidates determined may be the frequency band candidates 71, 73, 75, and 77 shown in FIG. 16.

As another example, if the maximum bandwidth of the UE 200 is 4 MHz, the two or more frequency band candidates to be determined are the frequency band candidates 81, 83, 85, 87, and 89 shown in FIG. It's okay.

The two or more frequency band candidates may be determined further based on the subcarrier spacing of the BWP. Thereby, the bandwidth of each of the two or more frequency band candidates may be accurately represented by the number of RBs.

The BWP may be composed of the two or more frequency band candidates, and the two or more frequency band candidates do not need to overlap with each other. That is, the two or more frequency band candidates may be obtained by dividing the BWP. The explanation regarding this point is the same as the explanation for the third modification, and redundant explanation will be omitted here.

The two or more frequency band candidates may each have different identification information, and the second information may include identification information of one of the two or more frequency band candidates. The explanation regarding this point is the same as the explanation for the third modification, and redundant explanation will be omitted here.

Naturally, each of the two or more frequency band candidates has a bandwidth equal to or less than the maximum bandwidth of the UE 200. The explanation regarding this point is the same as the explanation for the third modification, and redundant explanation will be omitted here.

The above two or more frequency band candidates do not necessarily have to have the same bandwidth. For example, the two or more frequency band candidates may include one or more frequency band candidates with the same bandwidth and one frequency band candidate with a different bandwidth from the one or more frequency band candidates. good.

As an example, when the bandwidth of the BWP is 20 MHz and the maximum bandwidth of the UE 200 is 3 MHz, the two or more frequency band candidates determined are the frequency band candidates 90, 91, and 91 shown in FIG. 92, 93, 94, 95, and 96 may be used. As another example, when the bandwidth of the BWP is 10 MHz and the maximum bandwidth of the UE 200 is 4 MHz, the two or more frequency band candidates determined are the frequency band candidate 97 shown in FIG. It may be 98 or 99.

The fourth modification of the embodiment of the present disclosure has been described above. According to the fourth modification, for example, the amount of the second information can be significantly reduced while determining frequency band candidates more flexibly.

(5) Fifth Modification: Second Information In the fourth modification of the embodiment of the present disclosure, the two or more frequency band candidates are determined based on the maximum bandwidth of the UE 200. However, frequency band candidates according to embodiments of the present disclosure are not limited to this example.

As a fifth modification, the two or more frequency band candidates may be determined based on information included in the RRC message instead of the maximum bandwidth of the UE 200. The UE 200 may determine the two or more frequency band candidates based on the information included in the RRC message.

As an example, the information included in the RRC message may indicate the bandwidth of each of the two or more frequency band candidates. As another example, the information included in the RRC message may indicate the number of divisions when dividing the BWP to obtain the two or more frequency band candidates. Naturally, the information included in the RRC message is not limited to these examples.

Other features of the fourth modification may also be applied to the fifth modification. Therefore, redundant explanation will be omitted here.

The fifth modification of the embodiment of the present disclosure has been described above. According to the fifth modification, for example, the amount of the second information can be significantly reduced while determining frequency band candidates more flexibly.

(6) Sixth modification: Setting of two or more frequency bands In the above-described example of the embodiment of the present disclosure, one frequency band used by the UE 200 is set in the BWP used by the UE 200. Ru. However, embodiments of the present disclosure are not limited to this example.

As a sixth modification, two or more frequency bands used by the UE 200 may be set within the BWP used by the UE 200. More specifically, two or more DL frequency bands used by the UE 200 may be set within the above DL BWP used by the UE 200, and two or more UL frequency bands used by the UE 200, It may be set within the above UL BWP used by the UE 200.

(6-1) First Example As a first example, the RRC message may include the second information for each of the two or more frequency bands set within the BWP. In particular, the first information included in the RRC message may include the second information for each of the two or more frequency bands.

More specifically, the first information element included in the first information includes the third information element included in the second information for each of the two or more DL frequency bands. But that's fine. The second information element included in the first information may include the fourth information element included in the second information for each of the two or more UL frequency bands.

The RRC message may further include information indicating a frequency band to be activated among the two or more frequency bands. The information may be included in the first information.

The RRC message may further include information indicating a default frequency band among the two or more frequency bands. The information may be included in the first information.

Referring to FIG. 20, for example, the first information element included in the first information is BWP-Downlink, and the third information element included in the second information is BWP-Downlink. It may be included BWP-RedCap-r18. DownlinkBWP-ToAddModList-RedCap-r18 included in BWP-Downlink may include BWP-RedCap-r18 for each of the two or more DL frequency bands set in the DL BWP. BWP-RedCap-r18 may include bwp-Id-RedCap-r18, which is identification information of the DL frequency band, and locationAndBandwidth, which indicates the position and bandwidth of the DL frequency band. Furthermore, BWP-Downlink includes firstActiveDownlinkBWP-Id-RedCap-r18 indicating a DL frequency band to be activated among the two or more DL frequency bands, and/or a It may also include defaultDownlinkBWP-Id-RedCap-r18 indicating the default DL frequency band.

Referring to FIG. 21, for example, the second information element included in the first information is BWP-Uplink, and the fourth information element included in the second information is BWP-Uplink. It may be included BWP-RedCap-r18. UplinkBWP-ToAddModList-RedCap-r18 included in BWP-Uplink may include BWP-RedCap-r18 for each of the two or more UL frequency bands set in the UL BWP. BWP-RedCap-r18 may include bwp-Id-RedCap-r18, which is identification information of the UL frequency band, and locationAndBandwidth, which indicates the position and bandwidth of the UL frequency band. Further, the BWP-Uplink may include firstActiveUplinkBWP-Id-RedCap-r18 indicating the UL frequency band to be activated among the two or more UL frequency bands.

Note that, similarly to the second modification of the embodiment of the present disclosure, instead of the above locationAndBandwidth indicating the position and bandwidth of the frequency band, startRBoffset indicating the offset of the start position of the frequency band and the band of the frequency band. sizeofRBs indicating the width may be included.

(6-2) Second example As a second example, similarly to the third to fifth modified examples, the above BWP used by the UE 200 may include two or more frequency band candidates for the UE 200. Often, the two or more frequency band candidates may be set as the two or more frequency bands used by the UE 200. That is, the two or more frequency bands used by the UE 200 may be automatically set according to the settings of the BWP used by the UE 200.

In this case, the frequency band indicated by the second information may be a frequency band to be activated among the two or more frequency bands. As an example, the second information may include identification information of a frequency band to be activated.

The RRC message may further include information indicating a default frequency band among the two or more frequency bands. The information may be included in the first information.

(6-3) Frequency band switching The base station 100 (information acquisition unit 141) acquires switching information for switching an active frequency band among the two or more frequency bands, and base station 100 (communication processing The unit 143) may transmit the switching information to the UE 200. The UE 200 (communication processing unit 233) may receive the switching information, and the UE 200 (information acquisition unit 231) may acquire the switching information. The UE 200 (communication processing unit 233) may switch the active frequency band based on the switching information.

- First Example As a first example, the switching information may indicate a frequency band to be activated among the two or more frequency bands.

The above switching information may be included in the DCI. That is, the base station 100 (information acquisition unit 141) may acquire the DCI including the switching information, and the base station 100 (communication processing unit 143) may transmit the DCI to the UE 200. The UE 200 (communication processing unit 233) may receive the DCI, and the UE 200 (information acquisition unit 231) may acquire the switching information included in the DCI. The switching information may be an additional Bandwidth Part Indicator included in the DCI.

Alternatively, the above switching information may be included in the RRC message. The base station 100 (information acquisition unit 141) may further acquire an RRC message including the switching information, and the base station 100 (communication processing unit 143) may further transmit the RRC message to the UE 200. The UE 200 (communication processing unit 233) may receive the RRC message, and the UE 200 (information acquisition unit 231) may acquire the switching information included in the RRC message. The RRC message may be an RRC Reconfiguration message. The switching information may be firstActiveDownlinkBWP-Id-RedCap-r18 and firstActiveUplinkBWP-Id-RedCap-r18.

After receiving the switching information, the UE 200 (communication processing unit 233) may switch the active frequency band to the frequency band indicated by the switching information.

- Second Example As a second example, the switching information may indicate a default frequency band among the two or more frequency bands that becomes the active frequency band upon expiration of a timer.

The RRC message including the first information and the second information may further include the switching information and timer information indicating the time period of the timer. Referring again to FIG. 20, the switching information may be defaultDownlinkBWP-Id-RedCap-r18. Although not shown in FIG. 20, the timer information may be bwp-InactiveTimer-RedCap-r18.

The UE 200 (communication processing unit 233) may switch the active frequency band to the default frequency band after the timer expires.

The sixth modification of the embodiment of the present disclosure has been described above. According to the sixth modification, for example, the UE 200 can use a frequency band that is more preferable for the UE 200. Therefore, the communication quality of UE 200 can be improved.

The sixth modification of the embodiment of the present disclosure may be combined with any one of the first to fifth modifications of the embodiment of the present disclosure.

(7) Seventh Modification: Application of BWP and Frequency Band In the above-described example of the embodiment of the present disclosure, the application of the BWP and the frequency band has been explained. However, embodiments of the present disclosure are not limited to this example.

At least some of the signals described as being received or transmitted using the BWP in the above-described examples of embodiments of the present disclosure may be received or transmitted using the frequency band instead of the BWP. Good too.

For example, a PDSCH scheduled using SI-RNTI or P-RNTI may be received using the above frequency band instead of the above BWP.

For example, at least one of PDCCH and PUCCH may be received using the above frequency band instead of the above BWP.

Additionally, at least some of the signals described as being received or transmitted using the frequency band in the above-described examples of embodiments of the present disclosure may be received or transmitted using the BWP rather than the frequency band. May be sent.

The seventh modification of the embodiment of the present disclosure may be combined with any one of the first to fifth modifications of the embodiment of the present disclosure. Additionally or alternatively, the seventh variant of the embodiment of the present disclosure may be combined with the sixth variant of the embodiment of the present disclosure.

(8) Eighth Modified Example: Handover In the above-described example of the embodiment of the present disclosure, the BWP used by the UE 200 is the BWP used for communication with the base station 100. However, embodiments of the present disclosure are not limited to this example.

As an eighth modification, the RRC message may be an RRC message for handover of the UE 200 to the target base station, and the BWP indicated by the first information included in the RRC message is It may also be a BWP for communicating with a target base station.

The RRC message may be an RRC Reconfiguration message including ReconfigurationWithSync.

The RRC message may be an RRC message generated by the target base station and transmitted from the target base station to the base station 100.

An example of processing according to the eighth modification of the embodiment of the present disclosure will be described with reference to FIG. 22.

The base station 100 (communication processing unit 143) that is the source base station transmits a HANDOVER REQUEST message to the base station 500 that is the target base station (S610). The base station 500 receives the HANDOVER REQUEST message.

The base station 500 performs admission control and transmits a HANDOVER REQUEST ACKNOWLEDGE message to the base station 100 (S620). The base station 100 (communication processing unit 143) receives the HANDOVER REQUEST ACKNOWLEDGE message.

The base station 100 (information acquisition unit 141) acquires the RRC Reconfiguration message included in the HANDOVER REQUEST ACKNOWLEDGE message. Then, the base station 100 (communication processing unit 143) transmits the RRC Reconfiguration message to the UE 200 (S630). The UE 200 (communication processing unit 233) receives the RRC Reconfiguration message. The RRC Reconfiguration message includes the first information and the second information.

The UE 200 (information acquisition unit 231) acquires information included in the RRC Reconfiguration message. Then, the UE 200 (communication processing unit 233) switches the serving cell to a new cell of the base station 500 based on the information included in the RRC Reconfiguration message (S640). Specifically, the UE 200 (communication processing unit 233) performs a random access procedure and accesses the new cell. Note that the UE 200 (information acquisition unit 231) acquires the first information and the second information included in the RRC Reconfiguration message, and the UE 200 (communication processing unit 233) acquires the information indicated by the first information. The BWP and the frequency band indicated by the second information are set.

The UE 200 (information acquisition unit 231) acquires the RRCReconfigurationComplete message. Then, the UE 200 (communication processing unit 233) transmits the RRCReconfigurationComplete message to the base station 500 (S650). The base station 500 receives the RRCReconfigurationComplete message.

The UE 200 (communication processing unit 233) communicates with the base station 500 using the above BWP and the above frequency band.

The eighth modification of the embodiment of the present disclosure has been described above. According to the eighth modification, for example, even after handover to the target base station, the UE 200 can communicate with the target base station at a low peak data rate using the frequency band within the BWP.

The eighth modification of the embodiment of the present disclosure may be combined with any one of the first to fifth modifications of the embodiment of the present disclosure. Additionally or alternatively, the eighth variation of the embodiment of the present disclosure may be combined with at least one of the sixth variation and the seventh variation of the embodiment of the present disclosure.

(9) Ninth Modification: System In the above-described example of the embodiment of the present disclosure, the system 1 is a system compliant with 5G or NR TS. However, the system 1 according to the embodiment of the present disclosure is not limited to this example.

As a ninth modification of the embodiment of the present disclosure, the system 1 may be a system compliant with another 3GPP TS. As an example, the system 1 may be a system compliant with next generation (eg, 6G) TS.

Alternatively, the system 1 may be a system that complies with the TS of another standardization organization regarding mobile communications.

The ninth modification of the embodiment of the present disclosure may be combined with any one of the first to fifth modifications of the embodiment of the present disclosure. Additionally or alternatively, the ninth variation of the embodiment of the present disclosure may be combined with at least one of the sixth to eighth variations of the embodiment of the present disclosure.

Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the embodiments. It will be understood by those skilled in the art that the embodiments are exemplary only and that various modifications can be made without departing from the scope and spirit of the disclosure.

For example, the steps in the process described in this specification do not necessarily have to be executed in chronological order in the order described in the flowchart or sequence diagram. For example, steps in a process may be performed in a different order than depicted in a flowchart or sequence diagram, or may be performed in parallel. Also, some of the steps in the process may be deleted, and additional steps may be added to the process.

For example, a method may be provided that includes operations of one or more components of the apparatus described herein, and a program may be provided that causes a computer to perform the operations of the components. Further, a computer-readable non-transitional physical recording medium may be provided on which the program is recorded. Of course, such methods, programs, and non-transitory tangible computer-readable storage media are also included in this disclosure.

For example, one or more components of a base station described herein may be included in or provided with a module for the base station. That is, a base station module that performs the base station processing described in this specification may be provided.

For example, one or more components of a user equipment (UE) described herein may be included in or provided with a module for the UE. That is, a UE module that performs the UE processing described in this specification may be provided.

For example, in the present disclosure, user equipment (UE) may refer to a terminal apparatus, a terminal, a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, subscriber equipment, subscriber unit, radio station, radio terminal, radio device, radio unit, wireless station, wireless terminal, wireless device, wireless unit, access station, access terminal, access device, access unit, remote station , remote terminal, remote device, or remote unit.

For example, in the present disclosure, the UE may be a mobile phone terminal such as a smartphone, a tablet terminal, a personal computer, a mobile router, or a wearable device. Alternatively, the UE may be a device installed in a mobile body, or may be the mobile body itself. The moving object may be a vehicle such as a car and a train, a flying object such as an airplane or a drone, or another moving object such as a ship. Alternatively, in the present disclosure, the UE may be other IoT (Internet of Things) devices such as sensors and cameras. A UE may be mobile or fixed.

For example, in the present disclosure, an "information element" may be information defined as an information element (IE) in the 3GPP TS, or may be an individual content (i.e., field) of the IE. Good too. Alternatively, an "information element" may be a set of two or more IEs, a set of two or more fields, or a set of one or more IEs and one or more fields. It's okay. Alternatively, the "information element" may be any other information. The phrase "information element" in the present disclosure may be simply replaced with the phrase "information."

For example, in this disclosure, "transmit" may mean performing at least one layer of processing within a protocol stack used for transmission, or transmitting a signal wirelessly or by wire to a physical It may also mean sending to. Alternatively, "transmitting" may mean a combination of processing the at least one layer and physically transmitting the signal wirelessly or by wire. Similarly, "receive" may mean processing at least one layer within the protocol stack used for receiving, or physically receiving a signal, wirelessly or by wire. It can also mean that. Alternatively, "receiving" may mean a combination of processing the at least one layer and physically receiving the signal wirelessly or by wire. The at least one layer may be translated into at least one protocol.

For example, in this disclosure, "obtain/acquire" may mean obtaining information from among stored information, or obtaining information from among information received from other nodes. It may also mean to obtain the information by generating the information.

For example, in this disclosure, "include" and "comprise" do not mean including only the listed items, and may include only the listed items, or may include only the listed items, or This means that it may contain further items in addition to.

For example, in the present disclosure, "or" does not mean an exclusive OR, but a logical OR.

Note that the technical features included in the embodiments described above may be expressed as the following features. Of course, the present disclosure is not limited to the following features.

(Feature 1)
an information acquisition unit (141) that acquires an RRC (radio resource control) message;
a communication processing unit (143) that transmits the RRC message to user equipment (200);
Equipped with
The user equipment is a RedCap UE (reduced capability user equipment),
The RRC message is
first information indicating a bandwidth part (51, 55) used by the user equipment;
second information indicating a frequency band (53) set within the bandwidth portion and used by the user equipment;
including,
Apparatus (100).

(Feature 2)
The apparatus according to feature 1, wherein the bandwidth part is an RRC configured BWP (band width part).

(Feature 3)
the bandwidth portion includes a downlink bandwidth portion used by the user equipment and an uplink bandwidth portion used by the user equipment;
The frequency band is a downlink frequency band configured within the downlink bandwidth portion, the downlink frequency band used by the user equipment and the uplink frequency band configured within the uplink bandwidth portion. a link frequency band, comprising an uplink frequency band used by the user equipment;
The device according to feature 1 or 2.

(Feature 4)
The first information includes a first information element indicating the downlink bandwidth portion and a second information element indicating the uplink bandwidth portion,
The second information includes a third information element indicating the downlink frequency band and a fourth information element indicating the uplink frequency band.
The device according to feature 3.

(Feature 5)
4. The apparatus according to any one of features 1 to 3, wherein the frequency band is a frequency band used by the user equipment for at least one of receiving and transmitting a physical shared channel.

(Feature 6)
The apparatus according to feature 5, wherein the physical shared channel includes a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

(Feature 7)
The physical shared channel is scheduled using C-RNTI (cell radio network temporary identifier), MCS-C-RNTI (modulation and coding scheme cell radio network temporary identifier) or CS-RNTI (configured scheduling radio network temporary identifier). 7. The apparatus of feature 5 or 6, comprising a physical shared channel.

(Feature 8)
The bandwidth portion is used by the user equipment for reception of a physical downlink shared channel (PDSCH) that is scheduled using an SI-RNTI (system information radio network temporary identifier) or a P-RNTI (paging radio network temporary identifier). 8. The apparatus according to feature 7, wherein the bandwidth portion is further used.

(Feature 9)
The apparatus according to any one of the preceding features, wherein the bandwidth portion is a bandwidth portion used by the user equipment for reception of a physical downlink control channel (PDCCH).

(Feature 10)
The apparatus according to any one of the preceding features, wherein the bandwidth portion is a bandwidth portion used by the user equipment for transmission of a physical uplink control channel (PUCCH).

(Feature 11)
The RRC message further includes information indicating multiple types of search spaces for the bandwidth portion;
At least one search space of the plurality of types of search spaces is a search space monitored by the user equipment for reception of DCI used for scheduling physical shared channels within the frequency band. ,
Other search spaces of the plurality of types of search spaces are search spaces monitored by the user equipment for reception of other DCIs;
The device according to any one of features 1 to 10.

(Feature 12)
12. The apparatus of any one of features 1-11, wherein the frequency band is narrower than the bandwidth portion.

(Feature 13)
The device according to feature 12, wherein the frequency band is a frequency band of 5 MHz or less in a frequency range of 450 MHz to 6000 MHz.

(Feature 14)
14. The apparatus according to any one of features 1 to 13, wherein the subcarrier spacing of the frequency band is the same as the subcarrier spacing of the bandwidth portion.

(Feature 15)
The device according to any one of features 1 to 14, wherein the second information is included in the first information.

(Feature 16)
The first information includes a parameter indicating a position and a bandwidth of the bandwidth portion, a parameter indicating a subcarrier interval of the bandwidth portion, and a parameter indicating a cyclic prefix of the bandwidth portion. Apparatus according to any one of features 1 to 15.

(Feature 17)
17. The apparatus of any one of features 1-16, wherein the RRC message includes the first information for each of two or more bandwidth portions used by the user equipment.

(Feature 18)
18. The device according to any one of features 1 to 17, wherein the second information includes parameters indicating the position and bandwidth of the frequency band.

(Feature 19)
19. The device according to feature 18, wherein the second information does not include a parameter indicating a subcarrier interval of the frequency band and a parameter indicating a cyclic prefix of the frequency band.

(Feature 20)
19. The device according to feature 18, wherein the second information further includes a parameter indicating a subcarrier interval of the frequency band and a parameter indicating a cyclic prefix of the frequency band.

(Feature 21)
The first information includes a parameter indicating the position and bandwidth of the bandwidth portion, a parameter indicating a subcarrier interval of the bandwidth portion, and a parameter indicating a cyclic prefix of the bandwidth portion,
the subcarrier spacing of the frequency band is the same as the subcarrier spacing of the bandwidth portion;
the cyclic prefix of the frequency band is the same as the cyclic prefix of the bandwidth portion;
Apparatus according to any one of features 18 to 20.

(Feature 22)
18. The apparatus according to any one of features 1 to 17, wherein the second information indicates an offset of a starting position of the frequency band with respect to a starting position of the bandwidth portion and a bandwidth of the frequency band.

(Feature 23)
23. The apparatus according to feature 22, wherein the second information indicates the offset by the number of resource blocks included in the offset and indicates the bandwidth of the frequency band by the number of resource blocks included in the frequency band.

(Feature 24)
24. The apparatus of feature 23, wherein the offset and the bandwidth of the frequency band depend on subcarrier spacing of the frequency band.

(Feature 25)
The bandwidth portion includes two or more frequency band candidates that are candidates for the frequency band,
the second information indicates one of the two or more frequency band candidates as the frequency band;
Apparatus according to any one of features 1 to 17.

(Feature 26)
The bandwidth portion consists of the two or more frequency band candidates,
the two or more frequency band candidates do not overlap with each other;
The device according to feature 25.

(Feature 27)
The two or more frequency band candidates each have different identification information,
The second information includes identification information of one of the two or more frequency band candidates,
Apparatus according to feature 25 or 26.

(Feature 28)
28. The apparatus according to any one of features 25-27, wherein the two or more frequency band candidates are predetermined for the bandwidth portion.

(Feature 29)
28. The apparatus of any one of features 25-27, wherein the two or more frequency band candidates are determined based on a maximum bandwidth of the user equipment.

(Feature 30)
30. The apparatus of feature 29, wherein the two or more frequency band candidates are determined further based on subcarrier spacing of the bandwidth portion.

(Feature 31)
28. The apparatus according to any one of features 25-27, wherein the two or more frequency band candidates are determined based on information included in the RRC message.

(Feature 32)
32. The apparatus of any one of features 25-31, wherein each of the two or more frequency band candidates has a bandwidth that is less than or equal to a maximum bandwidth of the user equipment.

(Feature 33)
Feature 32, wherein the two or more frequency band candidates include one or more frequency band candidates having the same bandwidth and one frequency band candidate having a different bandwidth from the one or more frequency band candidates. The device described in.

(Feature 34)
34. The apparatus according to any one of features 25-33, wherein the frequency band is an activated frequency band.

(Feature 35)
The RRC message includes the second information for each of the two or more frequency bands configured within the bandwidth portion and used by the user equipment. Apparatus according to any one of features 1 to 24.

(Feature 36)
36. The apparatus of feature 35, wherein the first information includes the second information for each of the two or more frequency bands.

(Feature 37)
37. The apparatus of feature 35 or 36, wherein the RRC message further includes information indicating a frequency band to be activated of the two or more frequency bands.

(Feature 38)
two or more frequency bands used by the user equipment are configured within the bandwidth portion;
The communication processing unit transmits switching information for switching an active frequency band among the two or more frequency bands to the user equipment.
Apparatus according to any one of features 1 to 37.

(Feature 39)
39. The apparatus of feature 38, wherein the switching information indicates a frequency band to be activated of the two or more frequency bands.

(Feature 40)
The device according to feature 39, wherein the communication processing unit transmits downlink control information (DCI) including the switching information to the user equipment.

(Feature 41)
40. The apparatus according to feature 39, wherein the communication processing unit further transmits an RRC message including the switching information to the user equipment.

(Feature 42)
The switching information indicates a default frequency band among the two or more frequency bands that becomes an active frequency band upon expiration of a timer;
The RRC message further includes the switching information and timer information indicating a period of the timer.
Apparatus according to feature 38.

(Feature 43)
43. The apparatus according to any one of features 1-42, wherein the RRC message is an RRC Reconfiguration message.

(Feature 44)
the RRC message is an RRC message for handover of the user equipment to a target base station;
the bandwidth portion is a bandwidth portion for communicating with the target base station;
Apparatus according to any one of features 1 to 43.

(Feature 45)
45. The apparatus of feature 44, wherein the RRC message is an RRC Reconfiguration message that includes ReconfigurationWithSync.

(Feature 46)
Features 1 to 45, wherein the RedCap UE is a second type of RedCap UE with further reduced capabilities than the first type of RedCap UE with a maximum bandwidth of 20MHz for a frequency range of 450MHz to 6000MHz. The device according to any one of the items.

(Feature 47)
47. The apparatus of feature 46, wherein a peak data rate of the second type of RedCap UE is lower than a peak data rate of the first type of RedCap UE.

(Feature 48)
48. The apparatus according to any one of features 1-47, wherein the apparatus is a base station or a module for a base station.

(Feature 49)
a communication processing unit (233) that receives an RRC (radio resource control) message transmitted by the base station (100);
an information acquisition unit (231) that acquires first information and second information included in the RRC message;
Equipped with
the first information indicates a bandwidth part (51, 55) used by the user equipment (200);
The second information indicates a frequency band (53) set within the bandwidth portion and used by the user equipment;
The user equipment is a RedCap UE (reduced capability user equipment).
Device (200).

(Feature 50)
50. The apparatus according to feature 49, wherein the communication processing unit communicates with the base station using the bandwidth portion and the frequency band.

(Feature 51)
51. The apparatus of feature 50, wherein the communication processing unit receives or transmits a physical shared channel using the frequency band.

(Feature 52)
52. The apparatus of feature 51, wherein the physical shared channel includes a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH).

(Feature 53)
The physical shared channel is scheduled using C-RNTI (cell radio network temporary identifier), MCS-C-RNTI (modulation and coding scheme cell radio network temporary identifier) or CS-RNTI (configured scheduling radio network temporary identifier). 53. The apparatus of feature 51 or 52, comprising a physical shared channel.

(Feature 54)
The communication processing unit uses the bandwidth portion to create a PDSCH (physical downlink shared channel) scheduled using an SI-RNTI (system information radio network temporary identifier) or a P-RNTI (paging radio network temporary identifier). 54. The apparatus according to feature 53, wherein the apparatus receives:

(Feature 55)
55. The apparatus according to any one of features 50 to 54, wherein the communication processing unit receives a PDCCH (physical downlink control channel) using the bandwidth portion.

(Feature 56)
56. The apparatus according to any one of features 50 to 55, wherein the communication processing unit uses the bandwidth portion to transmit a PUCCH (physical uplink control channel).

(Feature 57)
57. The apparatus according to any one of features 49-56, wherein the apparatus is the user equipment or a module for the user equipment.

(Feature 58)
A method performed by a base station (100), comprising:
Obtaining an RRC (radio resource control) message;
sending the RRC message to user equipment (200);
including;
The user equipment is a RedCap UE (reduced capability user equipment),
The RRC message is
first information indicating a bandwidth part (51, 55) used by the user equipment;
second information indicating a frequency band (53) set within the bandwidth portion and used by the user equipment;
including,
Method.

(Feature 59)
A method performed by user equipment (200), comprising:
receiving an RRC (radio resource control) message transmitted by a base station (100);
obtaining first information and second information included in the RRC message;
including;
the first information indicates a bandwidth part (51, 55) used by the user equipment;
The second information indicates a frequency band (53) set within the bandwidth portion and used by the user equipment;
The user equipment is a RedCap UE (reduced capability user equipment).
Method.

(Feature 60)
Obtaining an RRC (radio resource control) message;
sending the RRC message to user equipment (200);
A program that causes a computer to execute
The user equipment is a RedCap UE (reduced capability user equipment),
The RRC message is
first information indicating a bandwidth part (51, 55) used by the user equipment;
second information indicating a frequency band (53) set within the bandwidth portion and used by the user equipment;
including,
program.

(Feature 61)
receiving an RRC (radio resource control) message transmitted by a base station (100);
obtaining first information and second information included in the RRC message;
A program that causes a computer to execute
the first information indicates a bandwidth part (51, 55) used by the user equipment (200);
The second information indicates a frequency band (53) set within the bandwidth portion and used by the user equipment;
The user equipment is a RedCap UE (reduced capability user equipment).
program.

(Feature 62)
Obtaining an RRC (radio resource control) message;
sending the RRC message to user equipment (200);
A computer-readable non-transitional physical recording medium that records a program that causes a computer to execute,
The user equipment is a RedCap UE (reduced capability user equipment),
The RRC message is
first information indicating a bandwidth part (51, 55) used by the user equipment;
second information indicating a frequency band (53) set within the bandwidth portion and used by the user equipment;
including,
A computer-readable non-transitory physical recording medium.

(Feature 63)
receiving an RRC (radio resource control) message transmitted by a base station (100);
obtaining first information and second information included in the RRC message;
A computer-readable non-transitional physical recording medium that records a program that causes a computer to execute,
the first information indicates a bandwidth part (51, 55) used by the user equipment (200);
The second information indicates a frequency band (53) set within the bandwidth portion and used by the user equipment;
The user equipment is a RedCap UE (reduced capability user equipment).
A computer-readable non-transitory physical recording medium.

Claims (15)

1. an information acquisition unit (141) that acquires an RRC (radio resource control) message;
   a communication processing unit (143) that transmits the RRC message to user equipment (200);
   Equipped with
   The user equipment is a RedCap UE (reduced capability user equipment),
   The RRC message is
   first information indicating a bandwidth part (51, 55) used by the user equipment;
   second information indicating a frequency band (53) set within the bandwidth portion and used by the user equipment;
   including,
   Apparatus (100).
2. the bandwidth portion includes a downlink bandwidth portion used by the user equipment and an uplink bandwidth portion used by the user equipment;
   The frequency band is a downlink frequency band configured within the downlink bandwidth portion, the downlink frequency band used by the user equipment and the uplink frequency band configured within the uplink bandwidth portion. a link frequency band, comprising an uplink frequency band used by the user equipment;
   The device according to claim 1.
3. 3. The apparatus of claim 1 or 2, wherein the frequency band is a frequency band used by the user equipment for at least one of receiving and transmitting a physical shared channel.
4. The physical shared channel may be C-RNTI (cell radio network temporary identifier), MCS-C-RNTI (modulation and coding scheme cell radio network temporary identifier) or CS-RNTI (configured scheduling radio network temporary identifier).　identifier) 4. The apparatus of claim 3, comprising a physical shared channel.
5. The bandwidth portion is used by the user equipment for reception of a PDSCH (physical downlink shared channel) scheduled using an SI-RNTI (system information radio network temporary identifier) or a P-RNTI (paging radio network temporary identifier). 5. The apparatus according to claim 4, further comprising a used bandwidth portion.
6. The apparatus according to claim 1 or 2, wherein the second information is included in the first information.
7. The apparatus according to claim 1 or 2, wherein the second information includes parameters indicating the position and bandwidth of the frequency band.
8. The apparatus according to claim 1 or 2, wherein the second information indicates an offset of a starting position of the frequency band with respect to a starting position of the bandwidth portion and a bandwidth of the frequency band.
9. The bandwidth portion includes two or more frequency band candidates that are candidates for the frequency band,
   the second information indicates one of the two or more frequency band candidates as the frequency band;
   Apparatus according to claim 1 or 2.
10. The apparatus according to claim 9, wherein the two or more frequency band candidates are predetermined for the bandwidth portion.
11. The apparatus of claim 9, wherein the two or more frequency band candidates are determined based on a maximum bandwidth of the user equipment.
12. two or more frequency bands used by the user equipment are configured within the bandwidth portion;
    The communication processing unit transmits switching information for switching an active frequency band among the two or more frequency bands to the user equipment.
    Apparatus according to claim 1 or 2.
13. the RRC message is an RRC message for handover of the user equipment to a target base station;
    the bandwidth portion is a bandwidth portion for communicating with the target base station;
    Apparatus according to claim 1 or 2.
14. a communication processing unit (233) that receives an RRC (radio resource control) message transmitted by the base station (100);
    an information acquisition unit (231) that acquires first information and second information included in the RRC message;
    Equipped with
    the first information indicates a bandwidth part (51, 55) used by the user equipment (200);
    The second information indicates a frequency band (53) set within the bandwidth portion and used by the user equipment,
    The user equipment is a RedCap UE (reduced capability user equipment).
    Device (200).
15. A method performed by a base station (100), comprising:
    Obtaining an RRC (radio resource control) message;
    sending the RRC message to user equipment (200);
    including;
    The user equipment is a RedCap UE (reduced capability user equipment),
    The RRC message is
    first information indicating a bandwidth part (51, 55) used by the user equipment;
    second information indicating a frequency band (53) set within the bandwidth portion and used by the user equipment;
    including,
    Method.