Base station and user equipment

Abstract

One embodiment of the present disclosure relates to a base station (100) including: an information acquisition unit (141) that acquires a Master Information Block (MIB); and a communication processing unit (143) that transmits the MIB. The MIB contains 1-bit information related to a bandwidth of a Control Resource Set (CORESET) for a user equipment having a limited bandwidth capability.

Description

[0001] Cross Reference to Related Applications

[0002] This application is based on Japanese Patent Application No. 2020-187344 filed on November 10, 2020, the content of which is incorporated herein by reference in its entirety for purposes of priority. TECHNICAL FIELD

[0003] The present disclosure relates to a base station and a user equipment. BACKGROUND

[0004] Mobile communication technologies are proposed in 3GPP (3rd Generation Partnership Project) and standardized as Technical Specifications (TS). In particular, 5G (5th Generation) technologies have been proposed and standardized.

[0005] For example, as described in Non-Patent Literature 1, a base station broadcasts system information, and a user equipment (UE) receives the system information. As the system information, there are a master information block (MIB), a system information block 1 (SIB1), and other SIBs.

[0006] In addition, as described in Non-Patent Literature 2, a UE with reduced capability is studied. For example, it has been started to study to reduce the complexity of the UE, such as reducing the number of antennas, reducing the bandwidth, and the like.

[0007] Prior Art Documents

[0008] Non-Patent Literature

[0009] Non-Patent Literature 1: 3GPP TS 38.331 V16.2.0 (2020-09) “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Radio Resource Control (RRC) protocol specification (Release 16)”

[0010] Non-Patent Literature 2: 3GPP TSG RAN Meeting #89e, Electronic Meeting, September 14-18, 2020, RP-201677, Ericsson, "Revised SID on Study on support of reduced capability NR devices" SUMMARY

[0011] According to the technology disclosed in Non-Patent Literature 1, the MIB includes controlResourceSetZero that determines a control resource set (CORESET) #0. In particular, the controlResourceSetZero determines the bandwidth of the CORESET #0. However, as a result of the inventors' detailed studies, the following problem was found, that is, since the controlResourceSetZero is information common to all UEs, the bandwidth of the CORESET #0 can not be suitable for a UE having a narrow bandwidth as described in Non-Patent Literature 2.

[0012] An object of the present disclosure is to provide a base station and a user equipment that can use a control resource set having a bandwidth suitable for a user equipment.

[0013] A base station according to one embodiment of the present disclosure includes an information acquisition section that acquires a master information block (MIB), and a communication processing section that transmits the MIB. The MIB contains 1-bit information about the bandwidth of a control resource set (CORESET) for a user equipment having a restricted bandwidth capability.

[0014] A user equipment according to one embodiment of the present disclosure includes a communication processing section that receives a master information block (MIB) containing 1-bit information about the bandwidth of a control resource set (CORESET) for a user equipment having a restricted bandwidth capability, and an information acquisition section that acquires the 1-bit information contained in the MIB.

[0015] One embodiment of the present disclosure relates to a base station including an information acquisition section that acquires an RRC (Radio Resource Control) Reconfiguration message for handover of a user equipment from a source cell to a target cell, and a communication processing section that transmits the RRC Reconfiguration message to the user equipment. The RRC Reconfiguration message includes first CORESET information about a first control resource set (CORESET) in the target cell, and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell.

[0016] One embodiment of the present disclosure relates to a user equipment including a communication processing section that receives an RRC Reconfiguration message for handover of the user equipment from a source cell to a target cell from a base station, the RRC Reconfiguration message including first CORESET information about a first control resource set (CORESET) in the target cell, and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell, and an information acquisition section that acquires the first CORESET information or the second CORESET information.

[0017] According to the present disclosure, it is possible to use a control resource set with a bandwidth suitable for a user equipment. Furthermore, according to the present disclosure, other effects can be achieved instead of or in addition to the effect. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a diagram illustrating one example of a schematic configuration of a system related to an embodiment of the present disclosure.

[0019] Figure 2 is a block diagram illustrating one example of a schematic functional configuration of a base station related to an embodiment of the present disclosure.

[0020] Figure 3 is a block diagram illustrating one example of a schematic hardware structure of a base station related to an embodiment of the present disclosure.

[0021] Figure 4 is a block diagram illustrating one example of a schematic functional configuration of a user equipment related to an embodiment of the present disclosure.

[0022] Figure 5 is a block diagram illustrating one example of a schematic hardware structure of a user equipment related to an embodiment of the present disclosure.

[0023] Figure 6is an explanatory diagram for explaining an example of the MIB involved in the first embodiment.

[0024] Figure 7 is an explanatory diagram for explaining an example of the additional MIB involved in the first embodiment.

[0025] Figure 8 is a sequence diagram for explaining an example of the schematic flow of the processing involved in the first embodiment.

[0026] Figure 9 is an explanatory diagram for explaining an example of the MIB involved in the modified example of the first embodiment.

[0027] Figure 10 is a sequence diagram for explaining an example of the schematic flow of the processing involved in the modified example of the first embodiment.

[0028] Figure 11 is an explanatory diagram for explaining an example of the handover involved in the second embodiment.

[0029] Figure 12 is a sequence diagram for explaining an example of the schematic flow of a part of the handover processing involved in the second embodiment. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in the present specification and drawings, for elements that can be explained identically, repeated explanation can be omitted by labeling the same reference numerals.

[0031] The description will be made in the following order.

[0032] 1. Structure of system

[0033] 2. Structure of base station

[0034] 3. Structure of user equipment

[0035] 4. First embodiment

[0036] 4.1. Operation example

[0037] 4.2. Modified example

[0038] 5. Second embodiment

[0039] 5.1. Operation example

[0040] 5.2. Modified example

[0041] 6. Modified example

[0042] <<1. Structure of system>>

[0043] Reference Signs Figure 1Examples of the structure of the system 1 related to the embodiments of the present disclosure will be described. Referring to Figure 1 The system 1 includes a base station 100 and a user equipment (UE) 200.

[0044] For example, the system 1 is a system conforming to the Technical Specification (TS) of 3GPP. More specifically, for example, the system 1 is a system conforming to the TS of 5G or NR (New Radio). Of course, the system 1 is not limited to this example.

[0045] (1) Base station 100

[0046] The base station 100 is a node of a Radio Access Network (RAN) that communicates with a UE (for example, the UE 200) located within a coverage area 10 of the base station 100.

[0047] For example, the base station 100 communicates with the UE (for example, the UE 200) using a protocol stack of the RAN. For example, the protocol stack includes an RRC (Radio Resource Control) layer, an SDAP (Service Data Adaptation Protocol) layer, a PDCP (Packet Data Convergence Protocol) layer, an RLC (Radio Link Control) layer, a MAC (Medium Access Control) layer, and a physical (PHY) layer. Alternatively, the protocol stack can not include all of these layers, but include a part of these layers.

[0048] For example, the base station 100 is a gNB. The gNB is a node that provides NR user plane and control plane protocol terminations towards the UE and connects with a 5GC (5G Core Network) via an NG interface. Alternatively, the base station 100 can be an en-gNB.

[0049] The base station 100 can include a plurality of nodes. The plurality of nodes can include a first node that hosts higher layers included in the protocol stack described above, and a second node that hosts lower layers included in the protocol stack. The higher layers can include an RRC layer, an SDAP layer, and a PDCP layer, and the lower layers can include an RLC layer, a MAC layer, and a PHY layer. The first node can be a CU (central unit), and the second node can be a DU (Distributed Unit). Further, the plurality of nodes can include a third node that performs lower-level processing of the PHY layer, and the second node can perform upper-level processing of the PHY layer. The third node can be an RU (Radio Unit).

[0050] Alternatively, the base station 100 can be one of the plurality of nodes described above, and can be connected to other units of the plurality of nodes.

[0051] The base station 100 can be an IAB (Integrated Access and Backhaul) donor or an IAB node.

[0052] (2) UE 200

[0053] The UE 200 communicates with a base station. For example, the UE 200 communicates with the base station 100 when the UE 200 is located in a coverage area 10 of the base station 100.

[0054] For example, the UE 200 communicates with a base station (e.g., the base station 100) using the protocol stack described above.

[0055] <<2. Structure of base station>>

[0056] Examples of the structure of the base station 100 to which an embodiment of the present disclosure relates will be described with reference to Figure 2 andExamples of the structure of the base station 100 to which an embodiment of the present disclosure relates will be described with reference to Figure 3

[0057] (1) Functional structure

[0058] First, examples of the functional structure of the base station 100 to which an embodiment of the present disclosure relates will be described with reference to Figure 2 Examples of the functional structure of the base station 100 to which an embodiment of the present disclosure relates will be described with reference to Figure 2 The base station 100 includes a wireless communication unit 110, a network communication unit 120, a storage unit 130, and a processing unit 140.

[0059] The wireless communication unit 110 transmits and receives signals in a wireless manner. For example, the wireless communication unit 110 receives a signal from a UE, and transmits a signal to the UE.

[0060] The network communication section 120 receives a signal from a network, and transmits a signal to the network.

[0061] The storage section 130 stores various information.

[0062] The processing section 140 provides various functions of the base station 100. The processing section 140 includes an information acquisition section 141, a first communication processing section 143, and a second communication processing section 145. In addition, the processing section 140 can also include other constituent elements other than these constituent elements. That is, the processing section 140 can also perform operations other than operations of these constituent elements. The detailed operations of the information acquisition section 141, the first communication processing section 143, and the second communication processing section 145 will be described later.

[0063] For example, the processing section 140 (the first communication processing section 143) communicates with a UE (for example, the UE 200) via the wireless communication section 110. For example, the processing section 140 (the second communication processing section 145) communicates with other nodes (for example, a node within a core network or another base station) via the network communication section 120.

[0064] (2) Hardware structure

[0065] Next, an example of the hardware structure of the base station 100 according to the embodiment of the present disclosure will be described with reference to Figure 3 The base station 100 includes an antenna 181, an RF circuit 183, a network interface 185, a processor 187, a memory 189, and a storage 191. Figure 3

[0066] The antenna 181 converts a signal into an electric wave, and radiates the electric wave to space. In addition, the antenna 181 receives an electric wave in space, and converts the electric wave into a signal. The antenna 181 can include a transmission antenna and a reception antenna, or can also be a single antenna for transmission and reception. The antenna 181 can be a directional antenna, and can also include a plurality of antenna elements.

[0067] The RF circuit 183 performs analog processing of a signal transmitted and received via the antenna 181. The RF circuit 183 can include a high-frequency filter, an amplifier, a modulator, a low-pass filter, and the like.

[0068] The network interface 185 is, for example, a network adapter, and transmits a signal to a network, and receives a signal from a network.

[0069] ​The processor 187 performs digital processing of the signals transmitted and received via the antenna 181 and the RF circuit 183. The digital processing includes processing of the protocol stack of the RAN. The processor 187 also performs processing of the signals transmitted and received via the network interface 185. The processor 187 can include a plurality of processors, or can also be a single processor. The plurality of processors can include a baseband processor that performs the above-described digital processing, and one or more processors that perform other processing.

[0070] The memory 189 stores programs executed by the processor 187, parameters related to the programs, and data related to the programs. The memory 189 can include at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable Read Only Memory), an EEPROM (Electrically Erasable Programmable Read Only Memory), a RAM (Random Access Memory), and a flash memory. All or a part of the memory 189 can be included in the processor 187.

[0071] The storage device 191 stores various information. The storage device 191 can include at least one of an SSD (Solid State Drive) and an HDD (Hard Disc Drive).

[0072] The wireless communication section 110 can be implemented by the antenna 181 and the RF circuit 183. The network communication section 120 can be implemented by the network interface 185. The storage section 130 can be implemented by the storage device 191. The processing section 140 can be implemented by the processor 187 and the memory 189.

[0073] A part or all of the processing section 140 can be virtualized. In other words, a part or all of the processing section 140 can be implemented as a virtual machine. In this case, a part or all of the processing section 140 can operate as a virtual machine by a physical machine (i.e., hardware) including a processor and a memory, and a hypervisor.

[0074] In view of the above hardware structure, the base station 100 can include a memory (i.e., the memory 189) that stores a program, and one or more processors (i.e., the processor 187) that can execute the program, which can perform the above-described program to perform the operation of the processing section 140. The above-described program can be a program for causing the processor to perform the operation of the processing section 140.

[0075] <<3. Structure of user equipment>>

[0076] Referring to Figure 4 and Figure 5 An example of the structure of the UE 200 to which the embodiments of the present disclosure relate will be described.

[0077] (1) Functional structure

[0078] First, referring to Figure 4 An example of the functional structure of the UE 200 to which the embodiments of the present disclosure relate will be described. Referring to Figure 4 , the UE 200 includes a wireless communication section 210, a storage section 220, and a processing section 230.

[0079] The wireless communication section 210 transmits and receives signals in a wireless manner. For example, the wireless communication section 210 receives a signal from a base station, and transmits a signal to the base station. For example, the wireless communication section 210 receives a signal from another UE, and transmits a signal to the other UE.

[0080] The storage section 220 stores various information.

[0081] The processing section 230 provides various functions of the UE 200. The processing section 230 includes an information acquisition section 231 and a communication processing section 233. In addition, the processing section 230 can further include other constituent elements other than these constituent elements. That is, the processing section 230 can also perform operations other than the operations of these constituent elements. The detailed operations of the information acquisition section 231 and the communication processing section 233 will be described later.

[0082] For example, the processing section 230 (the communication processing section 233) communicates with a base station (for example, the base station 100) or another UE via the wireless communication section 210.

[0083] (2) Hardware structure

[0084] Next, referring to Figure 5 An example of the hardware structure of the UE 200 to which the embodiments of the present disclosure relate will be described. Referring to Figure 5 , the UE 200 includes an antenna 281, an RF circuit 283, a processor 285, a memory 287, and a storage device 289.

[0085] The antenna 281 converts a signal into an electric wave, and radiates the electric wave to space. In addition, the antenna 281 receives an electric wave in space, and converts the electric wave into a signal. The antenna 281 can include a transmission antenna and a reception antenna, or can also be a single antenna for transmission and reception. The antenna 281 can be a directional antenna, or can include a plurality of antenna elements.

[0086] The RF circuit 283 performs analog processing of signals transmitted and received via the antenna 281. The RF circuit 283 can include a high-frequency filter, an amplifier, a modulator, and a low-pass filter, and the like.

[0087] 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 a protocol stack of the RAN. The processor 285 can include a plurality of processors, or can also be a single processor. The plurality of processors can include a baseband processor that performs the above-described digital processing, and one or more processors that perform other processing.

[0088] The memory 287 stores programs executed by the processor 285, parameters related to the programs, and data related to the programs. The memory 287 can include at least one of a ROM, an EPROM, an EEPROM, a RAM, and a flash memory. All or a part of the memory 287 can be included in the processor 285.

[0089] The storage 289 stores various information. The storage 289 can include at least one of an SSD and an HDD.

[0090] The wireless communication section 210 can be implemented by the antenna 281 and the RF circuit 283. The storage section 220 can be implemented by the storage 289. The processing section 230 can be implemented by the processor 285 and the memory 287.

[0091] The processing section 230 can be implemented by a SoC (System on Chip) including the processor 285 and the memory 287. The SoC can include the RF circuit 283, and the wireless communication section 210 can also be implemented by the SoC.

[0092] In view of the above hardware structure, the UE 200 can include a memory (i.e., the memory 287) that stores a program, and one or more processors (i.e., the processor 285) that can execute the program, which can perform the above-described program to perform the operation of the processing section 230. The above-described program can be a program for causing the processor to perform the operation of the processing section 230.

[0093] <<4. First Embodiment>>

[0094] Reference Figure 6 to Figure 10 The first embodiment of the present disclosure will be described.

[0095] <<4.1. Operation Example>>

[0096] Reference Figure 6 to Figure 8 An example of the operation of the base station 100 and the UE 200 related to the first embodiment will be described.

[0097] The base station 100 (information acquisition section 141) acquires a Master Information Block (MIB). The base station 100 (first communication processing section 143) transmits the MIB. In particular, in the first embodiment, the MIB contains 1-bit information about a bandwidth of a Control Resource Set (CORESET) for a UE having a limited bandwidth capability.

[0098] The UE 200 (communication processing section 233) receives the MIB. The UE 200 (information acquisition section 231) acquires the 1-bit information contained in the MIB.

[0099] Thus, for example, the UE 200 can use a CORESET having a bandwidth suitable for the UE 200. More specifically, for example, when the UE 200 is a UE having a limited bandwidth capability, the UE 200 can use a CORESET for the UE.

[0100] (1) UE having a limited bandwidth capability

[0101] The UE having a limited bandwidth capability has a narrower maximum bandwidth than a normal UE. For example, the narrower maximum bandwidth is narrower than 96 Resource Blocks (RBs). The narrower maximum bandwidth can be narrower than 48 RBs. The narrower maximum bandwidth can be narrower than 24 RBs.

[0102] The limited bandwidth capability can be referred to as a reduced bandwidth capability, or a narrow bandwidth capability.

[0103] In addition, the UE having a limited bandwidth capability can have other limited capabilities, and can be referred to simply as a UE having a limited capability (or a reduced capability), or a RedCap (Reduced Capability) UE. For example, the other limited capabilities can include a capability of a limited number of antennas, and the UE having a limited capability can have fewer antennas than a normal UE. The other limited capabilities can include a capability of a limited duplex, and the UE having a limited capability can be able to communicate only through half-duplex communication. The half-duplex communication can be a half-duplex-FDD (Frequency Division Duplex).

[0104] The UE with the limited bandwidth capability can have a relaxed capability. For example, the relaxed capability can include a relaxed processing capability, and the UE with the limited bandwidth capability can have a lower processing performance than a normal UE.

[0105] (2) CORESET

[0106] For example, the CORESET is a CORESET for a Type0-PDCCH CSS (Common Search Space) set. In other words, the CORESET is a CORESET #0. In the CORESET, a PDCCH for a SIB1 is configured.

[0107] Thereby, for example, the UE 200 can receive the PDCCH for the SIB1 using the CORESET #0 having a bandwidth suitable for the UE 200, and receive the SIB1.

[0108] (3) 1-bit information

[0109] For example, the 1-bit information is information indicating whether or not to transmit an additional MIB including CORESET information indicating the bandwidth of the CORESET.

[0110] For example, in a case where the additional MIB is transmitted, the value of the 1-bit information is 1, and the 1-bit information indicates that the additional MIB is transmitted. In a case where the additional MIB is not transmitted, the value of the 1-bit information is 0, and the 1-bit information indicates that the additional MIB is not transmitted.

[0111] Alternatively, in a case where the additional MIB is transmitted, the value of the 1-bit information can also be 0, and the 1-bit information can also indicate that the additional MIB is transmitted. In a case where the additional MIB is not transmitted, the value of the 1-bit information can also be 1, and the 1-bit information can also indicate that the additional MIB is not transmitted.

[0112] Reference Figure 6In the example, the MIB includes 1-bit information indicating whether or not the additional MIB is transmitted, that is, Mib-bisPresence-r17. Thus, since a spare 1 bit included in the MIB is replaced with the 1-bit information (that is, Mib-bisPresence-r17), the size of the payload of the MIB is not changed to 23 bits. Thereby, backward compatibility of the MIB is maintained.

[0113] (4) Additional MIB

[0114] For example, the additional MIB is an MIB for a UE having a limited bandwidth capability. The additional MIB can also be referred to as MIB-bis. Of course, the additional MIB can also be referred to by another name.

[0115] — Transmission and reception

[0116] For example, the base station 100 (information acquisition section 141) acquires the additional MIB including the CORESET information. The base station 100 (first communication processing section 143) transmits the additional MIB.

[0117] The UE 200 (information acquisition section 231) acquires the 1-bit information included in the MIB. Also, for example, in a case where the UE 200 is a UE having a limited bandwidth capability and the 1-bit information included in the MIB indicates that the additional MIB is transmitted, the UE 200 (communication processing section 233) receives the additional MIB. The UE 200 (information acquisition section 231) acquires the CORESET information included in the additional MIB.

[0118] By the transmission of the additional MIB, for example, it is possible to maintain backward compatibility of the MIB and transmit a large amount of information (for example, various combinations of parameters of CORESET#0).

[0119] — Transmission and reception channel

[0120] For example, the base station 100 (first communication processing section 143) transmits the MIB in a physical broadcast channel (PBCH) and transmits the additional MIB in another physical channel. Thereby, for example, it is possible to maintain the PBCH. As one example, the other physical channel is an additional PBCH. The additional PBCH can also be referred to as PBCH-bis.

[0121] For example, the other physical channel is configured with frequency resources determined in correspondence with frequency resources in which the PBCH is configured. Thereby, for example, the UE 200 can receive the additional MIB even without receiving information about the other physical channel.

[0122] More specifically, for example, the above-described other physical channel is configured with 1 or more predetermined RBs among a plurality of RBs (e.g., 20 RBs) configured with the above-described PBCH. As one example, the above-described other physical channel can also be configured with the plurality of RBs (e.g., 20 RBs) configured with the above-described PBCH. As another example, the above-described other physical channel can also be configured with a predetermined number of central RBs among the plurality of RBs (e.g., 20 RBs) configured with the above-described PBCH. Thereby, for example, the UE 200 can easily receive the above-described additional MIB.

[0123] For example, the above-described other physical channel is configured with 1 or more symbols different from symbols configured with the above-described PBCH.

[0124] —Content

[0125] Referring to Figure 7 As one example, the above-described additional MIB is MIB-bis, which contains pdcch-ConfigSIB1-RedCap-r17. This pdcch-ConfigSIB1-RedCap-r17 contains the same information elements (IEs) as pdcch-ConfigSIB1 contained in the MIB, specifically, contains controlResourceSetZero and searchSpaceZero. This controlResourceSetZero indicates a bandwidth (e.g., a number of RBs) of a CORESET for a UE with a limited bandwidth capability. The above-described controlResourceSetZero indicates at least one of a multiplexing pattern, a number of symbols, and an RB offset of the above-described CORESET in addition to indicating the bandwidth of the CORESET. For example, 16 combinations of the multiplexing pattern, the number of RBs, the number of symbols, and the RB offset of the above-described CORESET are predetermined, and the above-described controlResourceSetZero indicates one of the 16 combinations.

[0126] (5) CORESET information

[0127] —Content of CORESET information in additional MIB

[0128] As described above, the above-described CORESET information contained in the above-described additional MIB indicates a bandwidth of a CORESET for a UE with a limited bandwidth capability. In other words, the above-described CORESET information determines the bandwidth of the CORESET.

[0129] For example, the above-described CORESET information indicates one of 2 or more predetermined bandwidths as the above-described bandwidth of the above-described CORESET.

[0130] For example, the above-described 2 or more predetermined bandwidths include a predetermined bandwidth narrower than 24 RBs. Thereby, for example, a UE having a limited bandwidth capability can use a CORESET even in a case where the UE can communicate only with a bandwidth narrower than 24 RBs.

[0131] The above-described 2 or more predetermined bandwidths can include only a predetermined bandwidth narrower than 24 RBs. Alternatively, the above-described 2 or more predetermined bandwidths can include one or more predetermined bandwidths narrower than 24 RBs and one or more predetermined bandwidths wider than 24 RBs.

[0132] Further, the above-described 2 or more predetermined bandwidths are not limited to the above-described example. The above-described 2 or more predetermined bandwidths can include no predetermined bandwidth narrower than 24 RBs. Even in such a case, a normal UE and a UE having a limited bandwidth capability can use different CORESET#0s from each other.

[0133] —Content of Other CORESET Information in MIB

[0134] The above-described MIB further includes 4-bit information related to another CORESET. The other CORESET is a CORESET for a normal UE, and the 4-bit information is, for example, controlResourceSetZero described in TS 38.213 V15.5.0. Figure 6 The above-described 4-bit information indicates 24 RBs, 48 RBs, or 96 RBs as a bandwidth of the above-described other CORESET.

[0135] Thereby, for example, a normal UE and a UE having a limited bandwidth capability can use different CORESET#0s from each other.

[0136] —Operation Based on CORESET Information

[0137] As described above, for example, the UE 200 (information acquisition section 231) acquires the above-described CORESET information included in the above-described additional MIB. In this case, for example, the UE 200 (communication processing section 233) determines the above-described CORESET for a UE having a limited bandwidth capability based on the above-described CORESET information, and receives a PDCCH for a SIB1 using the above-described CORESET. The UE 200 (communication processing section 233) receives the SIB1 based on DCI (Downlink Control Information) transmitted in the PDCCH.

[0138] (6) Flow of Processing

[0139] Referring to Figure 8 An example of the processing involved in the first embodiment will be described.

[0140] The base station 100 acquires the MIB containing the 1-bit information indicating whether or not to transmit the MIB-bis, and transmits (S310). The UE 200 receives the MIB, and acquires the 1-bit information.

[0141] The base station 100 acquires the MIB-bis, and transmits (S320). The MIB-bis contains the CORESET information indicating the bandwidth of the CORESET for the UE with the restricted bandwidth capability. The UE 200 receives the MIB-bis based on the 1-bit information, and acquires the CORESET information.

[0142] The base station 100 acquires the SIB1, and transmits (S330). The UE 200 receives the SIB1 based on the CORESET information.

[0143] <4.2. Modification>

[0144] In the first indication of whether or not to transmit the additional MIB containing the CORESET information indicating the bandwidth of the CORESET. However, the 1-bit information involved in the first embodiment is not limited to this example.

[0145] Referring to Figure 9 and Figure 10 A modification of the first embodiment will be described.

[0146] (1) 1-bit information

[0147] — 1-bit information = CORESET information

[0148] In the modification of the first embodiment, the 1-bit information contained in the MIB can also be the CORESET information indicating the bandwidth of the CORESET. Thereby, the UE 200 can maintain the backward compatibility of the MIB and use the CORESET with the bandwidth suitable for the UE 200 without adding new information outside the MIB.

[0149] Referring to Figure 9In the example, the MIB can also include 1-bit information indicating the bandwidth of the CORESET for the UE with the restricted bandwidth capability, i.e., redCap-CORESET-Zero-RB-r17. In this way, since the 1-bit included in the MIB for the padding is replaced with the 1-bit information (i.e., redCap-CORESET-Zero-RB-r17), the size of the payload of the MIB is not changed from 23 bits. Thus, the backward compatibility of the MIB is maintained.

[0150] The CORESET information (i.e., the 1-bit information) can also indicate one of 2 predetermined bandwidths as the bandwidth of the CORESET.

[0151] The 2 predetermined bandwidths can also include predetermined bandwidths narrower than 24 RBs. Thus, for example, the UE with the restricted bandwidth capability can use the CORESET even in a case where the UE can communicate only with a bandwidth narrower than 24 RBs.

[0152] The 2 predetermined bandwidths can also include only predetermined bandwidths narrower than 24 RBs. As one example, the 2 predetermined bandwidths can include 5 RBs and 10 RBs. In this case, in a case where the value of the 1-bit information is 0, the 1-bit information can indicate 5 RBs, and in a case where the value of the 1-bit information is 1, the 1-bit information can indicate 10 RBs.

[0153] Alternatively, the 2 predetermined bandwidths can include predetermined bandwidths narrower than 24 RBs and predetermined bandwidths wider than 24 RBs.

[0154] Further, the 2 bandwidths are not limited to the example. The 2 predetermined bandwidths can also not include predetermined bandwidths narrower than 24 RBs. Even in this case, the normal UE and the UE with the restricted bandwidth capability can use CORESET #0 different from each other.

[0155] Further, the 1-bit information can indicate at least one of the multiplexing pattern, the number of symbols, and the RB offset of the CORESET in addition to the bandwidth of the CORESET. Thus, for example, parameters suitable for the UE 200 can be used. Alternatively, the 1-bit information can indicate only the bandwidth of the CORESET. In this case, the multiplexing pattern, the number of symbols, and the RB offset indicated by other CORESET information (e.g., controlResourceSetZero) included in the MIB can be used as the parameters of the CORESET. Figure 9

[0156] — Operation based on 1-bit information​

[0157] The UE 200 (information acquisition section 231) can acquire the 1-bit information included in the MIB. Further, in a case where the UE 200 is a UE having a limited bandwidth capability, the UE 200 (communication processing section 233) can determine the above-described CORESET for a UE having a limited bandwidth capability based on the above-described 1-bit information, and can receive the PDCCH for the SIB1 using the above-described CORESET. The UE 200 (communication processing section 233) can receive the SIB1 based on the DCI transmitted in the PDCCH.

[0158] (2) Flow of processing

[0159] Reference Figure 10 An example of the processing related to a modification example of the first embodiment will be described.

[0160] The base station 100 acquires the MIB, and transmits (S350). The MIB includes 1-bit information indicating a bandwidth of a CORESET for a UE having a limited bandwidth capability. The UE 200 receives the above-described MIB, and acquires the above-described 1-bit information.

[0161] The base station 100 acquires the SIB1, and transmits (S360). The UE 200 receives the SIB1 based on the above-described 1-bit information.

[0162] <<5. Second Embodiment>>

[0163] Reference Figure 11 and Figure 12 A second embodiment of the present disclosure will be described.

[0164] <<5.1. Example of operation>>

[0165] Reference Figure 11 and Figure 12 An example of the operation of the base station 100 and the UE 200 related to the second embodiment will be described.

[0166] The base station 100 (information acquisition section 141) acquires an RRC reconfiguration message for handover of the UE 200 from a source cell to a target cell. The base station 100 (first communication processing section 143) transmits the above-described RRC reconfiguration message to the UE 200. In particular, in the second embodiment, the above-described RRC reconfiguration message includes: first CORESET information related to a first CORESET in the above-described target cell; and second CORESET information related to a second CORESET for a UE having a limited bandwidth capability in the above-described target cell.

[0167] The UE 200 (communication processing section 233) receives the above-described RRC reconfiguration message from the base station 100. The UE 200 (information acquisition section 231) acquires the above-described first CORESET information or the above-described second CORESET information.

[0168] Thereby, for example, the UE 200 can use the CORESET having a bandwidth suitable for the UE 200 in the target cell. More specifically, for example, when the UE 200 is a UE having a limited bandwidth capability, the UE 200 can use the CORESET for the UE in the target cell.

[0169] (1) Handover

[0170] The above-described handover is, for example, a handover between 2 base stations 100. Here, the base station 100 of the above-described source cell (i.e., the source base station) is denoted as base station 100A, and the base station 100 of the above-described target cell (i.e., the target base station) is denoted as base station 100B. The above-described handover can be referred to as Xn based Handover, or can be referred to as NG based Handover.

[0171] Referring to Figure 11 , the UE 200 moves from the coverage area 10A of the base station 100A to the coverage area 10B of the base station 100B. As a result, the handover of the UE 200 from the source cell (i.e., the coverage area 10A) of the base station 100A to the target cell (i.e., the coverage area 10B) of the base station 100B is performed. In this case, the base station 100A transmits the above-described RRC reconfiguration message to the UE 200.

[0172] The base station 100B (information acquisition section 141) acquires the above-described RRC reconfiguration message, for example. The base station 100B (second communication processing section 145) transmits a Handover Request Acknowledge message including the above-described RRC reconfiguration message to the base station 100A.

[0173] The base station 100A (second communication processing section 145) receives the above-described Handover Request Acknowledge message including the above-described RRC reconfiguration message, for example. The base station 100A (information acquisition section 141) acquires the above-described RRC reconfiguration message. The base station 100A (first communication processing section 143) transmits the above-described RRC reconfiguration message to the UE 200.

[0174] (2) UE having a limited bandwidth capability

[0175] The description of the UE with the limited bandwidth capability is the same as that in the first embodiment. Therefore, the repeated description is omitted here.

[0176] (3) CORESET

[0177] For example, the first CORESET and the second CORESET described above are CORESETs for a Type0-PDCCH CSS set, respectively. In other words, the first CORESET and the second CORESET described above are CORESET#0, respectively. The PDCCH for SIB1 is configured in the first CORESET and the second CORESET described above, respectively.

[0178] Thereby, for example, the UE 200 can receive the PDCCH for SIB1 using the CORESET#0 with the bandwidth suitable for the UE 200 in the target cell, and receive SIB1.

[0179] (4) CORESET information

[0180] — Content of the CORESET information

[0181] For example, the first CORESET information indicates the bandwidth of the first CORESET described above, and the second CORESET information indicates the bandwidth of the second CORESET described above. Thereby, for example, the normal UE and the UE with the limited bandwidth capability can use the CORESET#0 different from each other.

[0182] For example, the bandwidth of the first CORESET described above is 1 of 24 RBs, 48 RBs, and 96 RBs. For example, the bandwidth of the second CORESET described above is 1 of 2 or more predetermined bandwidths.

[0183] For example, the 2 or more predetermined bandwidths include a predetermined bandwidth narrower than 24 RBs. Thereby, for example, even in a case where the UE with the limited bandwidth capability can communicate only with a bandwidth narrower than 24 RBs, the UE can use the CORESET.

[0184] The 2 or more predetermined bandwidths can include only a predetermined bandwidth narrower than 24 RBs. Alternatively, the 2 or more predetermined bandwidths can include 1 or more predetermined bandwidths narrower than 24 RBs and 1 or more predetermined bandwidths wider than 24 RBs.

[0185] Moreover, the above two or more predetermined bandwidths are not limited to the above example. The above two or more predetermined bandwidths can not include a predetermined bandwidth narrower than 24 RBs. Even in such a case, the normal UE and the UE having the limited bandwidth capability can use different CORESET #0s from each other in the target cell.

[0186] For example, the above first CORESET information is firstcontrolResourceSetZero, and the above second CORESET information is secondcontrolResourceSetZero. The controlResourceSetZero indicates not only the bandwidth of the CORESET (i.e., the number of RBs) but also the multiplexing pattern, the number of symbols, and the RB offset of the CORESET. Thereby, for example, the normal UE and the UE having the limited capability can use different CORESET #0s from each other in the target cell in various ways.

[0187] Operation based on CORESET information

[0188] As described above, for example, the UE 200 (information acquisition section 231) acquires the above first CORESET information or the above second CORESET information included in the above RRC reconfiguration message. For example, in a case where the UE 200 is a UE having a limited bandwidth capability, the UE 200 (communication processing section 233) determines the above second CORESET in the above target cell based on the above second CORESET information, and receives a PDCCH for SIB1 using the above second CORESET. The UE 200 (communication processing section 233) receives SIB1 based on DCI transmitted in the PDCCH.

[0189] (5) RRC reconfiguration message

[0190] For example, the RRC reconfiguration message includes firstpdcch-configCommon and secondpdcch-configCommon for a UE having a limited bandwidth capability within BWP-DownlinkCommon. The above firstpdcch-configCommon includes the above first CORESET information (i.e., firstcontrolResourceSetZero). The above secondpdcch-configCommon includes the above second CORESET information (i.e., secondcontrolResourceSetZero).

[0191] Alternatively, the RRC reconfiguration message described above can include the first CORESET information and the second CORESET information in pdcch-configCommon included in BWP-DownlinkCommon.

[0192] Further, in the second embodiment, the configuration of the first CORESET information and the second CORESET information in the RRC reconfiguration message described above is not limited to these examples.

[0193] (6) Flow of processing

[0194] Reference Figure 12 An example of a part of the handover processing related to the second embodiment will be described.

[0195] The UE 200 transmits a Measurement Report message to the base station 100A (S410).

[0196] The base station 100A makes a handover decision (S420).

[0197] The base station 100A transmits a Handover Request message to the base station 100B (S430). The base station 100B receives the Handover Request message.

[0198] The base station 100B performs admission control (S440).

[0199] The base station 100B transmits a Handover Request Acknowledge message including an RRC reconfiguration message to the base station 100A (S450). The base station 100A receives the Handover Request Acknowledge message.

[0200] The RRC reconfiguration message described above includes first CORESET information related to a first CORESET in a target cell and second CORESET information related to a second CORESET for a UE having a restricted bandwidth capability in the target cell.

[0201] The base station 100A acquires the RRC reconfiguration message described above, and transmits the RRC reconfiguration described above to the UE 200 (S460). The UE 200 receives the RRC reconfiguration message described above, and acquires the first CORESET information or the second CORESET information.

[0202] <5.2. Modification>

[0203] In the above example of the second embodiment, the above handover is a handover between two base stations 100. However, the handover to which the second embodiment relates is not limited to this example.

[0204] As a modification of the second embodiment, the above handover can be a handover between two cells of the same base station 100 (for example, base station 100A). In this case, in the above handover, the above base station 100B can not operate, and only the base station 100A and the UE 200 can operate. The above RRC reconfiguration message can be generated by the base station 100A.

[0205] <<6. Modification>

[0206] In the above example of the embodiment of the present disclosure, the system 1 is a system conforming to TS of 5G or NR. However, the system 1 to which the embodiment of the present disclosure relates is not limited to this example.

[0207] The system 1 can also be a system conforming to other TS of 3GPP. As one example, the system 1 can be a system conforming to TS of LTE (Long Term Evolution), LTE-A (LTE Advanced), or 4G, and the base station 100 can be an eNB (evolved NodeB). As another example, the system 1 can be a system conforming to TS of 3G, and the base station 100 can be a NodeB. As still another example, the system 1 can be a system conforming to TS of the next generation (for example, 6G).

[0208] Alternatively, the system 1 can also be a system conforming to TS of other standardization organizations regarding mobile communication.

[0209] The above describes the embodiment of the present disclosure, but the present disclosure is not limited to this embodiment. It should be understood by those skilled in the art that the embodiment is only an example, and various modifications can be made without departing from the scope and spirit of the present disclosure.

[0210] For example, the steps in the processing described in this specification are not necessarily executed in chronological order along the order described in the flowchart or sequence diagram. For example, the steps in the processing can be executed in a different order from the order described in the flowchart or sequence diagram, or can be executed in parallel. In addition, a part of the steps in the processing can be deleted, or further steps can be added to the processing.

[0211] For example, a method including the operations of one or more components of the apparatus described in this specification can be provided, and a program for causing a computer to execute the operations of the components described above can be provided. In addition, a computer-readable non-transitory tangible storage medium in which the program is recorded can be provided. Of course, such a method, program, and computer-readable non-transitory tangible storage medium are also included in the present disclosure.

[0212] For example, in the present disclosure, a user equipment (UE) can also be referred to as a mobile station, a mobile terminal, a mobile device, a mobile unit, a subscriber station, a subscriber terminal, a subscriber device, a subscriber unit, a wireless station, a wireless terminal, a wireless device, a wireless unit, a remote station, a remote terminal, a remote device, or a remote unit, among other names.

[0213] For example, in the present disclosure, "transmit" can mean performing processing of at least one layer within a protocol stack used in transmission, or can also mean physically transmitting a signal by a wireless or wired method. Alternatively, "transmit" can mean a combination of performing processing of the at least one layer and physically transmitting a signal by a wireless or wired method. Likewise, "receive" can mean performing processing of at least one layer within a protocol stack used in reception, or can also mean physically receiving a signal by a wireless or wired method. Alternatively, "receive" can mean a combination of performing processing of the at least one layer and physically receiving a signal by a wireless or wired method.

[0214] For example, in the present disclosure, "obtain" or "acquire" can mean obtaining information from stored information, can also mean obtaining information from information received by another node, or can also mean obtaining the information by generating the information.

[0215] For example, in the present disclosure, "include" and "comprise" do not mean to include only what is listed, but mean to include only what is listed or to include what is listed and other items.

[0216] For example, in the present disclosure, "or" does not mean logical exclusive or, but means logical inclusive or.

[0217] Further, the technical features included in the above-described embodiments can also be expressed as the following features. Of course, the present disclosure is not limited to the following features.

[0218] (characteristic 1)

[0219] A base station (100) includes:

[0220] an information acquisition unit (141) that acquires a Master Information Block (MIB); and

[0221] a communication processing unit (143) that transmits the MIB,

[0222] the MIB includes 1-bit information related to a bandwidth of a Control Resource Set (CORESET) for a user equipment with a limited bandwidth capability.

[0223] (characteristic 2)

[0224] The base station according to characteristic 1, the 1-bit information is information indicating whether or not an additional MIB is transmitted, the additional MIB including CORESET information indicating the bandwidth of the CORESET.

[0225] (characteristic 3)

[0226] The base station according to characteristic 2, the additional MIB is a MIB for a user equipment with a limited bandwidth capability.

[0227] (characteristic 4)

[0228] The base station according to characteristic 2 or 3,

[0229] the information acquisition unit acquires the additional MIB,

[0230] the communication processing unit transmits the additional MIB.

[0231] (characteristic 5)

[0232] The base station according to characteristic 4, the communication processing unit transmits the MIB in a Physical Broadcast Channel (PBCH) and transmits the additional MIB in another physical channel.

[0233] (characteristic 6)

[0234] The base station according to characteristic 5, the other physical channel is configured with frequency resources determined from frequency resources configured according to the PBCH.

[0235] (characteristic 7)

[0236] The base station according to the feature 6, wherein the other physical channel is configured with one or more predetermined resource blocks (RBs) among a plurality of RBs in which the PBCH is configured.

[0237] (Feature 8)

[0238] The base station according to the feature 1, wherein the 1-bit information is CORESET information indicating the bandwidth of the CORESET.

[0239] (Feature 9)

[0240] The base station according to the feature 8, wherein the 1-bit information further indicates at least one of a multiplexing pattern, a number of symbols, and a resource block offset of the CORESET.

[0241] (Feature 10)

[0242] The base station according to any one of the features 2 to 9,

[0243] The CORESET information indicates one of two or more predetermined bandwidths as the bandwidth of the CORESET,

[0244] The two or more predetermined bandwidths include a predetermined bandwidth narrower than 24 resource blocks (RBs).

[0245] (Feature 11)

[0246] The base station according to any one of the features 1 to 10, wherein the MIB further includes 4-bit information about another CORESET,

[0247] The 4-bit information indicates 24 RBs, 48 RBs, or 96 RBs as a bandwidth of the other CORESET.

[0248] (Feature 12)

[0249] The base station according to any one of the features 1 to 11, wherein the CORESET is a CORESET for a Type0-PDCCH (Physical Downlink Control Channel) CSS (Common Search Space) set.

[0250] (Feature 13)

[0251] A user equipment (200) comprising:

[0252] A communication processing section (243) receives a Master Information Block (MIB) including 1-bit information about a bandwidth of a Control Resource Set (CORESET) for a user equipment with a limited bandwidth capability.

[0253] An information acquisition section (241) acquires the 1-bit information included in the MIB.

[0254] (Feature 14)

[0255] A base station (100) includes:

[0256] An information acquisition section (141) acquires an RRC (Radio Resource Control) reconfiguration message for a handover of a user equipment (200) from a source cell to a target cell; and

[0257] A communication processing section (143) transmits the RRC reconfiguration message to the user equipment,

[0258] The RRC reconfiguration message includes first CORESET information about a first Control Resource Set (CORESET) in the target cell and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell.

[0259] (Feature 15)

[0260] The base station according to Feature 14,

[0261] The first CORESET information indicates a bandwidth of the first CORESET,

[0262] The second CORESET information indicates a bandwidth of the second CORESET.

[0263] (Feature 16)

[0264] The base station according to Feature 15,

[0265] The bandwidth of the first CORESET is one of 24 Resource Blocks (RBs), 48 RBs, and 96 RBs,

[0266] The bandwidth of the second CORESET is one of 2 or more predetermined bandwidths,

[0267] The two or more predetermined bandwidths include a predetermined bandwidth narrower than 24 RBs.

[0268] (Feature 17)

[0269] The base station according to any one of features 14 to 16,

[0270] The first CORESET information is a first controlResourceSetZero,

[0271] The second CORESET information is a second controlResourceSetZero.

[0272] (Feature 18)

[0273] The base station according to any one of features 14 to 17, the first CORESET and the second CORESET are CORESETs for a Type0-PDCCH CSS (Common Search Space) set, respectively.

[0274] (Feature 19)

[0275] A user equipment (200) comprising:

[0276] A communication processing section (243) that receives, from a base station (100), an RRC (Radio Resource Control) reconfiguration message for handover of the user equipment from a source cell to a target cell,

[0277] The RRC reconfiguration message includes first CORESET information about a first control resource set (CORESET) in the target cell and second CORESET information about a second CORESET for a user equipment with a restricted bandwidth capability in the target cell,

[0278] The user equipment (200) includes an information acquisition section (241) that acquires the first CORESET information or the second CORESET information.

[0279] (Feature 20)

[0280] A base station (100B) comprising:

[0281] An information acquisition unit (141) acquires an RRC (Radio Resource Control) reconfiguration message for handover of a user device (200) from a source cell to a target cell; and

[0282] A communication processing unit (145) transmits, to a base station (100A) of the source cell, a handover request acknowledge message including the RRC reconfiguration message,

[0283] The RRC reconfiguration message includes first CORESET information about a first control resource set (CORESET) in the target cell and second CORESET information about a second CORESET for a user device with a limited bandwidth capability in the target cell.

[0284] (Feature 21)

[0285] A method performed by a base station (100) includes:

[0286] Acquiring a master information block (MIB); and

[0287] Transmitting the MIB,

[0288] The MIB includes 1-bit information about a bandwidth of a control resource set (CORESET) for a user device with a limited bandwidth capability.

[0289] (Feature 22)

[0290] A method performed by a user device (200) includes:

[0291] Receiving a master information block (MIB) including 1-bit information about a bandwidth of a control resource set (CORESET) for a user device with a limited bandwidth capability; and

[0292] Acquiring the 1-bit information included in the MIB.

[0293] (Feature 23)

[0294] A method performed by a base station (100) includes:

[0295] obtaining an RRC (Radio Resource Control) reconfiguration message for a user equipment (200) to handover from a source cell to a target cell; and

[0296] sending the RRC reconfiguration message to the user equipment,

[0297] the RRC reconfiguration message comprises: first CORESET (Control Resource Set) information about a first CORESET in the target cell; and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell.

[0298] (feature 24)

[0299] A method performed by a user equipment (200), comprising:

[0300] receiving, from a base station (100), an RRC (Radio Resource Control) reconfiguration message for the user equipment to handover from a source cell to a target cell,

[0301] the RRC reconfiguration message comprises: first CORESET (Control Resource Set) information about a first CORESET in the target cell; and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell,

[0302] the method further comprises: obtaining the first CORESET information or the second CORESET information.

[0303] (feature 25)

[0304] A method performed by a base station (100B), comprising:

[0305] obtaining an RRC (Radio Resource Control) reconfiguration message for a user equipment (200) to handover from a source cell to a target cell; and

[0306] sending, to a base station (100A) of the source cell, a handover request acknowledge message containing the RRC reconfiguration message,

[0307] The RRC reconfiguration message includes: first CORESET information about a first control resource set (CORESET) in the target cell; and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell.

[0308] (Feature 26)

[0309] A program for causing a computer to execute acquiring a master information block (MIB), and transmitting the MIB,

[0310] The MIB includes 1-bit information about a bandwidth of a control resource set (CORESET) for a user equipment with a limited bandwidth capability.

[0311] (Feature 27)

[0312] A program for causing a computer to execute:

[0313] receiving a master information block (MIB) including 1-bit information about a bandwidth of a control resource set (CORESET) for a user equipment with a limited bandwidth capability; and

[0314] acquiring the 1-bit information included in the MIB.

[0315] (Feature 28)

[0316] A program for causing a computer to execute:

[0317] acquiring an RRC (Radio Resource Control) reconfiguration message for a user equipment (200) to handover from a source cell to a target cell; and

[0318] transmitting the RRC reconfiguration message to the user equipment,

[0319] The RRC reconfiguration message includes: first CORESET information about a first control resource set (CORESET) in the target cell; and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell.

[0320] (Feature 29)

[0321] A program for causing a computer to execute receiving, from a base station (100), an RRC (Radio Resource Control) reconfiguration message for handover of a user equipment (200) from a source cell to a target cell,

[0322] The RRC reconfiguration message includes first CORESET information about a first control resource set (CORESET) in the target cell and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell,

[0323] The program is for causing a computer to execute acquiring the first CORESET information or the second CORESET information.

[0324] (Characteristics 30)

[0325] A program for causing a computer to execute:

[0326] acquiring an RRC (Radio Resource Control) reconfiguration message for handover of a user equipment (200) from a source cell to a target cell; and

[0327] transmitting, to a base station (100A) of the source cell, a handover request acknowledge (Handover Request Acknowledge) message including the RRC reconfiguration message,

[0328] The RRC reconfiguration message includes first CORESET information about a first control resource set (CORESET) in the target cell and second CORESET information about a second CORESET for a user equipment with a limited bandwidth capability in the target cell.

[0329] (Characteristics 31)

[0330] A computer-readable non-transitory storage medium recording a program for causing a computer to execute acquiring a master information block (MIB) and transmitting the MIB,

[0331] The MIB includes 1-bit information about a bandwidth of a control resource set (CORESET) for a user equipment with a limited bandwidth capability.

[0332] (Characteristics 32)

[0333] A computer-readable non-transitory storage medium recording a program for causing a computer to execute:

[0334] receiving a Master Information Block (MIB) containing 1-bit information related to a bandwidth of a Control Resource Set (CORESET) for a user equipment with a restricted bandwidth capability; and

[0335] obtaining the 1-bit information contained in the MIB.

[0336] (Feature 33)

[0337] A computer-readable non-transitory storage medium recording a program for causing a computer to execute:

[0338] obtaining an RRC (Radio Resource Control) reconfiguration message for a handover of a user equipment (200) from a source cell to a target cell; and

[0339] transmitting the RRC reconfiguration message to the user equipment,

[0340] the RRC reconfiguration containing: first CORESET (Control Resource Set) information related to a first CORESET in the target cell; and second CORESET information related to a second CORESET in the target cell for a user equipment with a restricted bandwidth capability.

[0341] (Feature 34)

[0342] A computer-readable non-transitory storage medium recording a program for causing a computer to execute receiving, from a base station (100), an RRC (Radio Resource Control) reconfiguration message for a handover of a user equipment (200) from a source cell to a target cell, wherein,

[0343] the RRC reconfiguration message contains: first CORESET (Control Resource Set) information related to a first CORESET in the target cell; and second CORESET information related to a second CORESET in the target cell for a user equipment with a restricted bandwidth capability,

[0344] The computer-readable non-transitory storage medium records a program for causing a computer to execute the following operations:

[0345] (Feature 35)

[0346] A computer-readable non-transitory storage medium records a program for causing a computer to execute the following operations:

[0347] obtaining an RRC (Radio Resource Control) reconfiguration message for a user equipment (200) to handover from a source cell to a target cell; and

[0348] sending, to a base station (100A) of the source cell, a Handover Request Acknowledge message containing the RRC reconfiguration message,

[0349] The RRC reconfiguration message contains: first CORESET (Control Resource Set) information about a first CORESET in the target cell; and second CORESET information about a second CORESET in the target cell for a user equipment with a restricted bandwidth capability.

Claims

1. A user equipment, comprising: The communication processing unit receives Radio Resource Control (RRC) reconfiguration messages from the base station for user equipment to hand over from the source cell to the target cell. The RRC reconfiguration message includes first information and second information. The first information relates to a first control resource set (CORESET) in the target cell, and the second information relates to a second CORESET in the target cell for capability-limited user equipment. The communication processing unit uses either the first information or the second information. The second information is used when the user equipment is the capability-limited user equipment.

2. The user equipment according to claim 1, The first CORESET and the second CORESET are CORESET#0.

3. A base station, comprising: The information acquisition unit acquires Radio Resource Control (RRC) reconfiguration messages used for user equipment to hand over from the source cell to the target cell; as well as The communication processing unit sends the RRC reconfiguration message to the user equipment. The RRC reconfiguration message includes first information and second information. The first information relates to a first control resource set (CORESET) in the target cell, and the second information relates to a second CORESET in the target cell for capability-limited user equipment. The second information is information used by the user equipment when the user equipment is the capability-limited user equipment.

4. The base station according to claim 3, The first CORESET and the second CORESET are CORESET#0.

5. A method performed by a user equipment, comprising: Receives a Radio Resource Control (RRC) reconfiguration message from the base station for the user equipment to hand over from the source cell to the target cell. The RRC reconfiguration message includes first information and second information. The first information relates to a first control resource set (CORESET) in the target cell, and the second information relates to a second CORESET in the target cell for capability-limited user equipment. The method further includes: using the first information or the second information. The second information is used when the user equipment is the capability-limited user equipment.

6. The method according to claim 5, The first CORESET and the second CORESET are CORESET#0.

7. A method performed by a base station, comprising: Obtain the Radio Resource Control (RRC) reconfiguration message used for handover of user equipment from the source cell to the target cell; as well as Send the RRC reconfiguration message to the user equipment. The RRC reconfiguration message includes first information and second information. The first information relates to a first control resource set (CORESET) in the target cell, and the second information relates to a second CORESET in the target cell for capability-limited user equipment. The second information is information used by the user equipment when the user equipment is the capability-limited user equipment.

8. The method according to claim 7, The first CORESET and the second CORESET are CORESET#0.

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