Base station and user equipment

Abstract

To provide a base station and user equipment, enabling the use of an initial bandwidth part having a bandwidth suitable for user equipment.SOLUTION: A base station according to an embodiment of the present disclosure includes an information acquisition part to acquire a system information block 1 (SIB1) and a communication processing part to transmit the SIB1. The SIB1 includes: a first parameter indicating the location and bandwidth of a first initial downlink bandwidth part (BWP); and a second parameter indicating the location and bandwidth of a second initial downlink BWP for user equipment that has limited bandwidth capabilities.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a base station and a user equipment.

Background Art

[0002] In 3GPP (3rd Generation Partnership Project), mobile communication technologies have been proposed and standardized as Technical Specifications (TS). In particular, currently, 5G (5th Generation) technologies have been proposed and standardized.

[0003] For example, as described in Non-Patent Document 1, a base station notifies system information, and a user equipment (UE) receives the system information. The system information includes a Master Information Block (MIB), a System Information Block 1 (SIB1), and other SIBs.

[0004] Also, as described in Non-Patent Document 2, UEs with reduced capabilities have been considered. For example, reduction of the complexity of UEs such as reduction of the number of antennas and reduction of bandwidth has begun to be considered.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] According to the technology disclosed in Non-Patent Document 1, SIB1 includes a parameter set (i.e., genericParameters) for the initial bandwidth part (BWP). The parameter set includes a parameter (i.e., locationAndBandwidth) indicating the position and bandwidth of the initial bandwidth part, among other things. However, as a result of the inventor's detailed study, since the parameters are common to all UEs, there is a problem that the bandwidth of the above initial BWP may not be suitable for UEs with a narrow bandwidth as described in Non-Patent Document 2.

[0007] An object of the present disclosure is to provide a base station and a user equipment that enable the use of an initial bandwidth part having a bandwidth suitable for the user equipment.

Means for Solving the Problems

[0008] A base station according to an aspect of the present disclosure includes an information acquisition unit that acquires a system information block 1 (SIB1), and a communication processing unit that transmits the SIB1. The SIB1 includes a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability.

[0009] A user equipment according to one aspect of the present disclosure includes a communication processing unit that receives a System Information Block 1 (SIB1) including a first parameter indicating the position and bandwidth of a first initial downlink Bandwidth Part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability, and an information acquisition unit that acquires the first parameter or the second parameter included in the SIB1.

[0010] A base station according to one aspect of the present disclosure includes an information acquisition unit that acquires an RRC (Radio Resource Control) message including identification information for identifying an initial downlink Bandwidth Part (BWP) for a user equipment having a limited bandwidth capability, and a communication processing unit that transmits the RRC message to the user equipment.

[0011] A user equipment according to one aspect of the present disclosure includes a communication processing unit that receives from a base station an RRC message including identification information for identifying an initial downlink Bandwidth Part (BWP) for a user equipment having a limited bandwidth capability, and an information acquisition unit that acquires the identification information included in the RRC message.

Advantages of the Invention

[0012] According to the present disclosure, it becomes possible to use an initial sub-band having a bandwidth suitable for the user equipment. Note that, according to the present disclosure, other effects may be achieved instead of, or together with, the above effect.

Brief Description of the Drawings

[0013]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0014] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the present specification and drawings, elements that can be similarly described may be denoted by the same reference numerals, and redundant description may be omitted.

[0015] The description will be made in the following order. 1. Configuration of the system 2. Configuration of the base station 3. Configuration of the user equipment 4. First embodiment 5. Second embodiment 6. Modification example

[0016] <1. Configuration of the system> With reference to FIG. 1, an example of the configuration of a system 1 according to an embodiment of the present disclosure will be described. Referring to FIG. 1, the system 1 includes a base station 100 and a user equipment (UE) 200.

[0017] For example, the system 1 is a system compliant with the technical specifications (TS) of 3GPP. More specifically, for example, the system 1 is a system compliant with the TS of 5G or NR (New Radio). Of course, the system 1 is not limited to this example.

[0018] (1) Base station 100 The base station 100 is a node of a Radio Access Network (RAN) and communicates with a UE (e.g., UE200) located within the coverage area 10 of the base station 100.

[0019] For example, the base station 100 communicates with a UE (e.g., UE200) using the RAN protocol stack. For example, the protocol stack includes a Radio Resource Control (RRC) layer, a Service Data Adaptation Protocol (SDAP) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer. Alternatively, the protocol stack may not include all of these layers and may include only some of these layers.

[0020] For example, the base station 100 is a gNB. A gNB is a node that provides NR user plane and control plane protocol terminations towards the UE and is connected to a 5G Core Network (5GC) via an NG interface. Alternatively, the base station 100 may be an en-gNB.

[0021] The base station 100 may include a plurality of 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. The higher layer may include an RRC layer, an SDAP layer, and a PDCP layer, and the lower layer may include an RLC layer, a MAC layer, and a 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).

[0022] Alternatively, the base station 100 may be one of the plurality of nodes and may be connected to other units among the plurality of nodes.

[0023] The base station 100 may be an IAB (Integrated Access and Backhaul) donor or an IAB node.

[0024] (2) UE200 The UE200 communicates with the base station. For example, the UE200 communicates with the base station 100 when it is located within the coverage area 10 of the base station 100.

[0025] For example, the UE200 communicates with the base station (e.g., the base station 100) using the protocol stack.

[0026] (2. Configuration of the Base Station) With reference to FIGS. 2 and 3, an example of the configuration of the base station 100 according to an embodiment of the present disclosure will be described.

[0027] (1) Functional Configuration First, referring to FIG. 2, an example of the functional configuration of the base station 100 according to an embodiment of the present disclosure will be described. Referring to FIG. 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.

[0028] The wireless communication unit 110 wirelessly transmits and receives signals. For example, the wireless communication unit 110 receives signals from the UE and transmits signals to the UE.

[0029] The network communication unit 120 receives signals from the network and transmits signals to the network.

[0030] The storage unit 130 stores various information.

[0031] The processing unit 140 provides various functions of the base station 100. The processing unit 140 includes an information acquisition unit 141 and a communication processing unit 143. Note that the processing unit 140 may further include other components other than these components. That is, the processing unit 140 may perform operations other than the operations of these components. The specific operations of the information acquisition unit 141 and the communication processing unit 143 will be described in detail later.

[0032] For example, the processing unit 140 (communication processing unit 143) communicates with the UE (for example, UE 200) via the wireless communication unit 110. For example, the processing unit 140 communicates with other nodes (for example, nodes in the core network or other base stations) via the network communication unit 120.

[0033] (2) Hardware Configuration Next, referring to FIG. 3, an example of the hardware configuration of the base station 100 according to an embodiment of the present disclosure will be described. Referring to FIG. 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.

[0034] Antenna 181 converts a signal into a radio wave and radiates the radio wave into space. Also, antenna 181 receives a radio wave in space and converts the radio wave into a signal. Antenna 181 may include a transmitting antenna and a receiving antenna, or may be a single antenna for both transmission and reception. Antenna 181 may be a directional antenna and may include a plurality of antenna elements.

[0035] RF circuit 183 performs analog processing of signals transmitted and received via antenna 181. RF circuit 183 may include a high-frequency filter, an amplifier, a modulator, a low-pass filter, and the like.

[0036] Network interface 185 is, for example, a network adapter, transmits a signal to the network, and receives a signal from the network.

[0037] Processor 187 performs digital processing of signals transmitted and received via antenna 181 and RF circuit 183. The digital processing includes processing of the RAN protocol stack. Processor 187 also processes signals transmitted and received via network interface 185. Processor 187 may include a plurality of processors or may be a single processor. The plurality of processors may include a baseband processor that performs the above digital processing and one or more processors that perform other processing.

[0038] Memory 189 stores a program executed by processor 187, parameters related to the program, and data related to the program. 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 in processor 187.

[0039] Storage 191 stores various information. Storage 191 may include at least one of SSD (Solid State Drive) and HDD (Hard Disc Drive).

[0040] The wireless communication unit 110 may be implemented by an antenna 181 and an RF circuit 183. The network communication unit 120 may be implemented by a network interface 185. The storage unit 130 may be implemented by a storage 191. The processing unit 140 may be implemented by a processor 187 and a memory 189.

[0041] 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 (i.e., hardware) including a processor and a memory, etc. and a hypervisor.

[0042] Considering the above hardware configuration, the base station 100 may include a memory (i.e., memory 189) for storing a program and one or more processors (i.e., processor 187) capable of executing the program, and the one or more processors may execute the above program to perform the operation of the processing unit 140. The above program may be a program for causing the processor to execute the operation of the processing unit 140.

[0043] <3. Configuration of User Equipment> With reference to FIGS. 4 and 5, an example of the configuration of the UE 200 according to an embodiment of the present disclosure will be described.

[0044] (1) Functional Configuration First, with reference to FIG. 4, an example of the functional configuration of the UE 200 according to an embodiment of the present disclosure will be described. Referring to FIG. 4, the UE 200 includes a wireless communication unit 210, a storage unit 220, and a processing unit 230.

[0045] The wireless communication unit 210 transmits and receives signals wirelessly. For example, the wireless communication unit 210 receives signals from a base station and transmits signals to the base station. For example, the wireless communication unit 210 receives signals from other UEs and transmits signals to other UEs.

[0046] The storage unit 220 stores various information.

[0047] The processing unit 230 provides various functions of the UE 200. The processing unit 230 includes an information acquisition unit 231 and a communication processing unit 233. Note that the processing unit 230 may further include other components other than these components. That is, the processing unit 230 may perform operations other than the operations of these components. The specific operations of the information acquisition unit 231 and the communication processing unit 233 will be described in detail later.

[0048] For example, the processing unit 230 (communication processing unit 233) communicates with a base station (for example, base station 100) or other UEs via the wireless communication unit 210.

[0049] (2) Hardware configuration Next, with reference to FIG. 5, an example of the hardware configuration of the UE 200 according to the embodiment of the present disclosure will be described. Referring to FIG. 5, the UE 200 includes an antenna 281, an RF circuit 283, a processor 285, a memory 287, and a storage 289.

[0050] The antenna 281 converts a signal into a radio wave and radiates the radio wave into space. Also, the antenna 281 receives a radio wave in space and converts the radio wave into a signal. The antenna 281 may include a transmitting antenna and a receiving antenna, or may be a single antenna for transmission and reception. The antenna 281 may be a directional antenna or may include a plurality of antenna elements.

[0051] The RF circuit 283 performs analog processing of signals transmitted and received via the antenna 281. The RF circuit 283 may include a high-frequency filter, an amplifier, a modulator, a low-pass filter, and the like.

[0052] Processor 285 performs digital processing of signals transmitted and received via antenna 281 and 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 multiple processors may include a baseband processor that performs the above digital processing and one or more processors that perform other processing.

[0053] Memory 287 stores programs executed by processor 285, parameters related to the programs, and data related to the programs. 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.

[0054] Storage 289 stores various information. Storage 289 may include at least one of SSD and HDD.

[0055] Wireless communication unit 210 may be implemented by antenna 281 and RF circuit 283. Storage unit 220 may be implemented by storage 289. Processing unit 230 may be implemented by processor 285 and memory 287.

[0056] Processing unit 230 may be implemented by a SoC (System on Chip) that includes processor 285 and memory 287. The SoC may include RF circuit 283, and wireless communication unit 210 may also be implemented by the SoC.

[0057] Considering the above hardware configuration, UE 200 may include a memory (i.e., memory 287) that stores a program and one or more processors (i.e., processor 285) capable of executing the program, and the one or more processors may execute the program to perform the operations of processing unit 230. The above program may be a program for causing the processor to execute the operations of processing unit 230.

[0058] <4. First Embodiment> Referring to FIG. 6, a first embodiment of the present disclosure will be described.

[0059] (1) Initial Downlink BWP - Parameters indicating position and bandwidth The base station 100 (information acquisition unit 141) acquires the system information block 1 (SIB1). The base station 100 (communication processing unit 143) transmits the SIB1. In particular, in the first embodiment, the SIB1 includes a first parameter indicating the position and bandwidth of the first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of the second initial downlink BWP for a user equipment having a limited bandwidth capability.

[0060] The UE 200 (communication processing unit 233) receives the SIB1. The UE 200 (information acquisition unit 231) acquires the first parameter or the second parameter included in the SIB1.

[0061] For example, the first parameter is locationAndBandwidth, which indicates the frequency domain position and bandwidth of the first initial downlink BWP. For example, the second parameter is also locationAndBandwidth, which indicates the frequency domain position and bandwidth of the second initial downlink BWP.

[0062] For example, the bandwidth of the second initial downlink BWP is narrower than the bandwidth of the first initial downlink BWP.

[0063] As a result, for example, the UE 200 can use an initial downlink BWP 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 initial downlink BWP for the UE (i.e., the second initial downlink BWP) can be used. As an example, when the maximum bandwidth of the UE 200 is 50 RBs, the UE 200 can use the initial downlink BWP for a UE having a limited bandwidth capability (e.g., 40 RBs) even if it cannot use the initial downlink BWP for a normal UE (e.g., 100 RBs).

[0064] - Other parameters For example, the SIB1 includes a first parameter set for the first initial downlink BWP and a second parameter set for the second initial downlink BWP. The first parameter set includes the first parameter, and the second parameter set includes the second parameter.

[0065] For example, the UE 200 (information acquisition unit 231) acquires the first parameter set or the second parameter set included in the SIB1.

[0066] For example, each of the first parameter set and the second parameter set is genericParameters.

[0067] -- Subcarrier Spacing For example, the first parameter set includes a parameter indicating the subcarrier spacing of the first initial downlink BWP, and the second parameter set includes a parameter indicating the subcarrier spacing of the second initial downlink BWP.

[0068] As a result, for example, it becomes possible to use different subcarrier spacings between two initial downlink BWPs.

[0069] -- Cyclic prefix For example, the first parameter set includes a parameter indicating the cyclic prefix of the first initial downlink BWP, and the second parameter set includes a parameter indicating the cyclic prefix of the second initial downlink BWP. For example, each of these parameters indicates whether to use a normal cyclic prefix or an extended cyclic prefix for the initial downlink BWP.

[0070] This enables, for example, the use of different cyclic prefixes between two initial downlink BWPs.

[0071] (2) Initial uplink BWP - Parameters indicating position and bandwidth For example, the SIB1 further includes a third parameter indicating the position and bandwidth of the first initial uplink BWP, and a fourth parameter indicating the position and bandwidth of the second initial uplink BWP for a user equipment with limited bandwidth capability.

[0072] For example, the UE200 (information acquisition unit 231) acquires the third parameter or the fourth parameter included in the SIB1.

[0073] For example, the third parameter is locationAndBandwidth, indicating the frequency domain position and bandwidth of the first initial uplink BWP. For example, the fourth parameter is also locationAndBandwidth, indicating the frequency domain position and bandwidth of the second initial uplink BWP.

[0074] For example, the bandwidth of the second initial uplink BWP is narrower than the bandwidth of the first initial uplink BWP.

[0075] This enables, for example, the UE 200 to use an initial uplink BWP 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 initial uplink BWP for the UE (i.e., the second initial uplink BWP) can be used. As an example, when the maximum bandwidth of the UE 200 is 50 RBs, the UE 200 can use the initial uplink BWP for a UE having a limited bandwidth capability (e.g., 40 RBs) even if it cannot use the initial uplink BWP for a normal UE (e.g., 100 RBs).

[0076] - Other parameters For example, the SIB1 includes a third parameter set for the first initial uplink BWP and a fourth parameter set for the second initial uplink BWP. The third parameter set includes the third parameter, and the fourth parameter set includes the fourth parameter.

[0077] For example, the UE 200 (information acquisition unit 231) acquires the third parameter set or the fourth parameter set included in the SIB1.

[0078] For example, each of the third parameter set and the fourth parameter set is genericParameters.

[0079] -- Subcarrier Spacing For example, the third parameter set includes a parameter indicating the subcarrier spacing of the first initial uplink BWP, and the fourth parameter set includes a parameter indicating the subcarrier spacing of the second initial uplink BWP.

[0080] This enables, for example, the use of different subcarrier spacings between two initial uplink BWPs.

[0081] -- Cyclic prefix For example, the third parameter set includes a parameter indicating the cyclic prefix of the first initial uplink BWP, and the fourth parameter set includes a parameter indicating the cyclic prefix of the second initial uplink BWP. For example, each of these parameters indicates whether to use a normal cyclic prefix or an extended cyclic prefix for the initial uplink BWP.

[0082] This enables, for example, the use of different cyclic prefixes between two initial uplink BWPs.

[0083] (3) UE with limited bandwidth capability The UE with limited bandwidth capability has a maximum bandwidth narrower than that of a normal UE. The limited bandwidth capability may be referred to as reduced bandwidth capability or narrow bandwidth capability.

[0084] Note that the UE with limited bandwidth capability may also have other limited capabilities, and may simply be referred to as a UE with limited capability (or reduced capability), or a RedCap (Reduced Capability) UE. For example, the other limited capabilities Li may include a limited number of antenna capabilities. A UE with limited capability may have fewer antennas than a normal UE. The other limited capabilities Li may include a limited duplex capability. Li The other limited capabilities Li may include a limited duplex capability. LiIt may include Ti, and a UE with limited capabilities may be able to communicate only in half-duplex. The half-duplex communication may be half-duplex-FDD (Frequency Division Duplex).

[0085] The above UE with limited bandwidth capabilities may have relaxed capabilities (relaxed capability). For example, the relaxed capabilities may include relaxed processing capabilities, and the above UE with limited bandwidth capabilities may have lower processing performance than a normal UE. Li It may have. For example, the relaxed capabilities may include relaxed processing capabilities, and the above UE with limited bandwidth capabilities may have lower processing performance than a normal UE. Li It may include relaxed processing capabilities, and the above UE with limited bandwidth capabilities may have lower processing performance than a normal UE.

[0086] (4) Operation Based on Parameters As described above, UE200 (information acquisition unit 231) acquires the first parameter set or the second parameter set included in the above SIB1. Also, as described above, UE200 (information acquisition unit 231) acquires the third parameter set or the fourth parameter set included in the above SIB1. For example, when UE200 is a normal UE, UE200 (communication processing unit 233) communicates with base station 100 using the first initial downlink BWP and the first initial uplink BWP based on the first parameter set and the third parameter set. For example, when UE200 is a UE with limited bandwidth capabilities, UE200 (communication processing unit 233) communicates with base station 100 using the second initial downlink BWP and the second initial uplink BWP based on the second parameter set and the fourth parameter set.

[0087] (4) Permission / Restriction of Access The above SIB1 may include access information regarding the permission or prohibition of access by a UE having a limited bandwidth capability. Thereby, for example, it becomes possible to control the access of a UE having a limited bandwidth capability.

[0088] As an example, the above access information is information indicating that a UE having a limited bandwidth capability is allowed to access the cell. In this case, when the above SIB1 includes the access information, the UE200 (communication processing unit 233) regards that a UE having a limited bandwidth capability can access the cell. On the other hand, when the above SIB1 does not include the access information, the UE200 (communication processing unit 233) regards that a UE having a limited bandwidth capability is prohibited from accessing the cell.

[0089] As another example, the above access information may be information indicating that a UE having a limited bandwidth capability is prohibited from accessing the cell. In this case, when the above SIB1 does not include the access information, the UE200 (communication processing unit 233) may regard that a UE having a limited bandwidth capability can access the cell. On the other hand, when the above SIB1 includes the access information, the UE200 (communication processing unit 233) may regard that a UE having a limited bandwidth capability is prohibited from accessing the cell.

[0090] As yet another example, the above access information may be information indicating whether a UE having a limited bandwidth capability is allowed or prohibited from accessing the cell. In this case, the UE200 (communication processing unit 233) may determine whether a UE having a limited bandwidth capability is allowed or prohibited from accessing the cell based on the above access information.

[0091] (5) Flow of processing Referring to FIG. 6, an example of the process according to the first embodiment will be described.

[0092] The base station 100 acquires and transmits the MIB (S310). The UE 200 receives the MIB.

[0093] The base station 100 acquires and transmits the SIB1 (S320). The SIB1 includes a first parameter set for the first initial downlink BWP and a second parameter set for a second initial downlink BWP for a UE having a limited bandwidth capability. Further, the SIB1 includes a third parameter set for the first initial uplink BWP and a fourth parameter set for a second initial uplink BWP for a UE having a limited bandwidth capability.

[0094] The UE 200 receives the SIB1. The UE 200 acquires the first parameter set and the third parameter set, or the second parameter set and the fourth parameter set.

[0095] (6) Variation In the above-described example of the first embodiment, the SIB1 includes the first parameter set, the second parameter set, the third parameter set, and the fourth parameter set. However, the first embodiment is not limited to this example.

[0096] As a variation of the first embodiment, the SIB1 includes a parameter set (e.g., genericParameters) for the initial downlink BWP, and the parameter set may include both the first parameter and the second parameter. Further, the parameter set may include other parameters common to the first initial downlink BWP and the second initial downlink BWP. The other parameters may include a parameter indicating the subcarrier spacing and a parameter indicating the cyclic prefix.

[0097] In addition, the SIB1 includes a parameter set (e.g., genericParameters) for the initial uplink BWP, and the parameter set may include both the third parameter and the fourth parameter. Further, the parameter set may include other parameters common to the first initial uplink BWP and the second initial uplink BWP. The other parameters may include a parameter indicating the subcarrier spacing and a parameter indicating the cyclic prefix.

[0098] Thereby, for example, an increase in the amount of information of the SIB1 can be reduced.

[0099] <5. Second Embodiment> Referring to FIG. 7, a second embodiment of the present disclosure will be described.

[0100] (1) Initial Downlink BWP - Identification Information In particular, in the second embodiment, the base station 100 (information acquisition unit 141) acquires an RRC message including identification information for identifying an initial downlink BWP for a UE having a limited bandwidth capability. The base station 100 (communication processing unit 143) transmits the RRC message to the UE 200. For example, the identification information is a BWP ID.

[0101] The UE 200 (communication processing unit 233) receives the RRC message from the base station. The UE 200 (information acquisition unit 231) acquires the identification information included in the RRC message.

[0102] This enables, for example, the UE 200 to use an initial downlink BWP 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 initial downlink BWP for the UE can be used. As an example, when the maximum bandwidth of the UE 200 is 50 RBs, the UE 200 can use an initial downlink BWP for a UE having a limited bandwidth capability (e.g., 40 RBs) even if it cannot use the initial downlink BWP for a normal UE (e.g., 100 RBs).

[0103] - Configuration information For example, the RRC message further includes configuration information for configuring a plurality of downlink BWPs, and the initial downlink BWP is one of the plurality of downlink BWPs. The identification information is the same as the identification information of the one downlink BWP.

[0104] For example, the configuration information is downlinkBWP-ToAddModList and includes a plurality of BWP-Downlinks. Each BWP-Downlink includes a BWP-ID and genericParameters, etc. The identification information (e.g., redCap-InitialDownlinkBWP-Id-r17) for identifying the initial downlink BWP for a UE having a limited bandwidth capability is a BWP ID but is an information element independent of downlinkBWP-ToAddModList. The identification information is the same as the BWP-ID of one BWP-Downlink included in downlinkBWP-ToAddModList.

[0105] This enables, for example, one of the configured plurality of downlink BWPs to be used as the initial downlink BWP. Therefore, there is no need to add new information other than the identification information, and the overhead can be reduced.

[0106] (2) Initial Uplink BWP - Identification information For example, the RRC message further includes other identification information for identifying an initial uplink BWP for a UE with limited bandwidth capabilities. For example, the other identification information is also a BWP ID.

[0107] For example, the UE 200 (information acquisition unit 231) acquires the other identification information included in the RRC message.

[0108] Thereby, for example, the UE 200 can use an initial uplink BWP having a bandwidth suitable for the UE 200. More specifically, for example, when the UE 200 is a UE with limited bandwidth capabilities, the initial uplink BWP for the UE can be used. As an example, when the maximum bandwidth of the UE 200 is 50 RBs, the UE 200 can use an initial uplink BWP for a UE with limited bandwidth capabilities (for example, 40 RBs) even if it cannot use an initial uplink BWP for a normal UE (for example, 100 RBs).

[0109] - Configuration information For example, the RRC message further includes configuration information for configuring a plurality of uplink BWPs, and the initial uplink BWP is one of the plurality of uplink BWPs. The other identification information is the same as the identification information of the one uplink BWP.

[0110] For example, the above configuration information is uplinkBWP-ToAddModList, which includes multiple BWP-Uplinks. Each BWP-Uplink includes a BWP-ID and genericParameters, etc. The above other identification information (e.g., redCap-InitialUplinkBWP-Id-r17) for identifying the above initial uplink BWP for a UE with limited bandwidth capability is a BWP ID but is an information element independent of uplinkBWP-ToAddModList. The above other identification information is the same as the BWP-ID of one BWP-Uplink included in uplinkBWP-ToAddModList.

[0111] Thereby, for example, it becomes possible to use one of the configured multiple uplink BWPs as the above initial uplink BWP. Therefore, there is no need to add new information other than the above other identification information, and the overhead can be suppressed.

[0112] (3) UE with limited bandwidth capability The description of the above UE with limited bandwidth capability is the same as the description in the first embodiment. Therefore, duplicate descriptions are omitted here.

[0113] (4) RRC message For example, the above RRC message is an RRC Setup message, an RRC Resume message, or an RRC Reconfiguration message. For example, the RRC Reconfiguration message is transmitted after the establishment or setup of an RRC connection.

[0114] Thereby, for example, it becomes possible to quickly use the initial BWP without changing SIB1.

[0115] Note that the above identification information and the above other identification information are included in ServingCellConfig in the above RRC message, for example.

[0116] (5) SIB1 For example, the base station 100 (information acquisition unit 141) acquires SIB1. The base station 100 (communication processing unit 143) transmits the SIB1.

[0117] - Initial BWP for normal UEs In particular, the SIB1 includes information regarding another initial downlink BWP that is different from the initial downlink BWP for UEs with limited bandwidth capabilities. The other initial downlink BWP is the initial downlink BWP for normal UEs. For example, the bandwidth of the initial downlink BWP for UEs with limited bandwidth capabilities is narrower than that of the other initial downlink BWP for normal UEs. For example, the BWP ID of the other initial downlink BWP for normal UEs is 0, and the BWP ID of the initial downlink BWP for UEs with limited bandwidth capabilities is other than 0.

[0118] Also, the SIB1 includes information regarding another initial uplink BWP that is different from the initial uplink BWP for UEs with limited bandwidth capabilities. The other initial uplink BWP is the initial uplink BWP for normal UEs. For example, the bandwidth of the initial uplink BWP for UEs with limited bandwidth capabilities is narrower than that of the other initial uplink BWP for normal UEs. For example, the BWP ID of the other initial uplink BWP for normal UEs is 0, and the BWP ID of the initial uplink BWP for UEs with limited bandwidth capabilities is other than 0.

[0119] - Provisional use -- Downlink For example, when the UE 200 is a UE with a limited bandwidth capability, the base station 100 (communication processing unit 143) uses the above initial downlink BWP for UEs with a limited bandwidth capability to transmit to the UE 200. Also, the UE 200 (communication processing unit 233) uses the above initial downlink BWP for UEs with a limited bandwidth capability to receive from the base station 100.

[0120] However, before transmitting the above RRC message to the UE 200, the base station 100 (communication processing unit 143) uses the above other initial downlink BWP for normal UEs to transmit to the UE 200. The UE 200 (communication processing unit 233) also uses the above other initial downlink BWP for normal UEs to receive from the base station 100 before receiving the above RRC message from the base station 100.

[0121] Thereby, for example, even before transmitting the above RRC message, transmission from the base station 100 to the UE 200 becomes possible.

[0122] -- Uplink For example, when the UE 200 is a UE with a limited bandwidth capability, the base station 100 (communication processing unit 143) uses the above initial uplink BWP for UEs with a limited bandwidth capability to receive from the UE 200. Also, the UE 200 (communication processing unit 233) uses the above initial uplink BWP for UEs with a limited bandwidth capability to transmit to the base station 100.

[0123] However, before transmitting the above RRC message to the UE 200, the base station 100 (communication processing unit 143) uses the above other initial uplink BWP for normal UEs to receive from the UE 200. The UE 200 (communication processing unit 233) also uses the above other initial uplink BWP for normal UEs to transmit to the base station 100 before receiving the above RRC message from the base station 100.

[0124] As a result, for example, even before the transmission of the above RRC message, transmission from the UE 200 to the base station 100 becomes possible.

[0125] (6) Flow of processing With reference to FIG. 7, an example of the processing according to the second embodiment will be described.

[0126] The base station 100 acquires and transmits an RRC message (S410). The RRC message includes identification information for identifying an initial downlink BWP for a UE having a limited bandwidth capability. Further, the RRC message also includes other identification information for identifying an initial uplink BWP for a UE having a limited bandwidth capability.

[0127] The UE 200 receives the above RRC message. The UE 200 acquires the above identification information for identifying the above initial downlink BWP and the above other identification information for identifying the above initial uplink BWP.

[0128] <<6. Modification examples>> In the above-described example of the embodiment of the present disclosure, the system 1 is a system compliant with the 5G or NR TS. However, the system 1 according to the embodiment of the present disclosure is not limited to this example.

[0129] The system 1 may be a system compliant with other TSs of 3GPP. As an example, the system 1 may be a system compliant with the LTE (Long Term Evolution), LTE-A (LTE Advanced) or 4G TS, and the base station 100 may be an eNB (evolved Node B). As another example, the system 1 may be a system compliant with the 3G TS, and the base station 100 may be a NodeB. As yet another example, the system 1 may be a system compliant with the next-generation (e.g., 6G) TS.

[0130] Alternatively, the system 1 may be a system compliant with the TSs of other standardization organizations for mobile communication.

[0131] As described above, embodiments of the present disclosure have been described, but the present disclosure is not limited to such embodiments. It will be understood by those skilled in the art that such embodiments are merely illustrative and that various modifications can be made without departing from the scope and spirit of the present disclosure.

[0132] For example, the steps in the processes described herein do not necessarily have to be executed in chronological order according to the order described in the flowchart or sequence diagram. For example, the steps in the process may be executed in an order different from the order described as the flowchart or sequence diagram, or may be executed in parallel. Also, some of the steps in the process may be deleted, and additional steps may be added to the process.

[0133] For example, a method including the operations of one or more components of the apparatus described herein may be provided, and a program for causing a computer to execute the operations of the above components may be provided. Also, a non-transitory tangible computer-readable storage medium recording the program may be provided. Naturally, such a method, program, and non-transitory tangible computer-readable storage medium are also included in the present disclosure.

[0134] For example, in the present disclosure, a user equipment (UE) may be referred to by another name such 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.

[0135] For example, in the present disclosure, "transmit" may mean performing processing of at least one layer within the protocol stack used for transmission, or may mean physically transmitting a signal wirelessly or via a wire. Alternatively, "transmit" may mean a combination of performing processing of the at least one layer and physically transmitting a signal wirelessly or via a wire. Similarly, "receive" may mean performing processing of at least one layer within the protocol stack used for reception, or may mean physically receiving a signal wirelessly or via a wire. Alternatively, "receive" may mean a combination of performing processing of the at least one layer and physically receiving a signal wirelessly or via a wire.

[0136] For example, in the present disclosure, "obtain / acquire" may mean obtaining information from stored information, may mean obtaining information from information received from other nodes, or may mean obtaining the information by generating the information.

[0137] For example, in the present disclosure, "include" and "comprise" do not mean including only the listed items, and may mean including only the listed items or may mean including additional items in addition to the listed items.

[0138] For example, in the present disclosure, "or" does not mean exclusive disjunction and means inclusive disjunction.

[0139] Note that the technical features included in the above-described embodiments may be expressed as the following features. Of course, the present disclosure is not limited to the following features.

[0140] (Feature 1) An information acquisition unit (141) that acquires a System Information Block 1 (SIB1); A communication processing unit (143) that transmits the SIB1 and The SIB1 includes a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability. Base station (100).

[0141] (Feature 2) The SIB1 includes a first parameter set for the first initial downlink BWP and a second parameter set for the second initial downlink BWP. The first parameter set includes the first parameter, a parameter indicating the subcarrier spacing of the first initial downlink BWP, and a parameter indicating the cyclic prefix of the first initial downlink BWP. The second parameter set includes the second parameter, a parameter indicating the subcarrier spacing of the second initial downlink BWP, and a parameter indicating the cyclic prefix of the second initial downlink BWP. The base station according to Feature 1.

[0142] (Feature 3) The SIB1 further includes a third parameter indicating the position and bandwidth of a first initial uplink BWP and a fourth parameter indicating the position and bandwidth of a second initial uplink BWP for a user equipment having a limited bandwidth capability, the base station according to Feature 1 or 2.

[0143] (Feature 4) The SIB1 includes a third parameter set for the first initial uplink BWP and a fourth parameter set for the second initial uplink BWP. The third parameter set includes the third parameter, a parameter indicating the sub-carrier spacing of the first initial uplink BWP, and a parameter indicating the cyclic prefix of the first initial uplink BWP. The fourth parameter set includes the fourth parameter, a parameter indicating the sub-carrier spacing of the second initial uplink BWP, and a parameter indicating the cyclic prefix of the second initial uplink BWP. The base station according to Feature 3.

[0144] (Feature 5) The SIB1 includes access information regarding permission or restriction of access by a user equipment having a limited bandwidth capability, and the base station according to any one of Features 1 to 4.

[0145] (Feature 6) A communication processing unit (233) that receives a System Information Block 1 (SIB1) including a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability; An information acquisition unit (231) that acquires the first parameter or the second parameter included in the SIB1; A user equipment (200) comprising the above.

[0146] (Feature 7) An information acquisition unit (141) that acquires an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (BWP) for a user equipment having a limited bandwidth capability; A communication processing unit (143) that transmits the RRC message to a user equipment (200); A base station (100) comprising the above.

[0147] (Feature 8) The base station according to feature 7, wherein the RRC message is an RRC Setup message, an RRC Resume message, or an RRC Reconfiguration message.

[0148] (Feature 9) The RRC message further includes configuration information constituting a plurality of downlink BWPs, The initial downlink BWP is one of the plurality of downlink BWPs, The identification information is the same as the identification information of the one downlink BWP. The base station according to feature 7 or 8.

[0149] (Feature 10) The information acquisition unit acquires a System Information Block 1 (SIB1) including information on another initial downlink BWP different from the initial downlink BWP, The communication processing unit transmits the SIB1, Before transmitting the RRC message to the user equipment, the communication processing unit performs transmission to the user equipment using the other initial downlink BWP. The base station according to any one of features 7 to 9.

[0150] (Feature 11) The base station according to any one of features 7 to 10, wherein the RRC message further includes other identification information for identifying an initial uplink BWP for a user equipment having a limited bandwidth capability.

[0151] (Feature 12) The RRC message further includes configuration information constituting a plurality of uplink BWPs, The initial uplink BWP is one of the plurality of uplink BWPs, The other identification information is the same as the identification information of the one uplink BWP. The base station according to feature 11.

[0152] (Feature 13) The information acquisition unit acquires a System Information Block 1 (SIB1) including information on another initial uplink BWP different from the initial uplink BWP, The communication processing unit transmits the SIB1, Before transmitting the RRC message to the user equipment, the communication processing unit receives from the user equipment using the other initial uplink BWP. The base station according to feature 11 or 12.

[0153] (Feature 14) A communication processing unit (233) that receives from a base station (100) an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (Bandwidth Part: BWP) for a user equipment having a limited bandwidth capability, An information acquisition unit (231) that acquires the identification information included in the RRC message, A user equipment (200) comprising:

[0154] (Feature 15) A method performed by a base station (100), comprising: Acquiring a System Information Block 1 (System Information Block 1: SIB1); Transmitting the SIB1; Including: The SIB1 includes a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (Bandwidth Part: BWP) and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability. Method.

[0155] (Feature 16) A method performed by a user equipment (200), comprising: Receiving a System Information Block 1 (SIB1) including a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP) and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability; Obtaining the first parameter or the second parameter included in the SIB1; A method comprising the above.

[0156] (Feature 17) A method performed by a base station (100), comprising: Obtaining an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (BWP) for a user equipment having a limited bandwidth capability; Transmitting the RRC message to a user equipment (200); A method comprising the above.

[0157] (Feature 18) A method performed by a user equipment (200), comprising: Receiving from a base station (100) an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (BWP) for a user equipment having a limited bandwidth capability; Obtaining the identification information included in the RRC message; A method comprising the above.

[0158] (Feature 19) Obtaining a System Information Block 1 (SIB1); Transmitting the SIB1; A program for causing a computer to execute the above; The SIB1 includes a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability. Program.

[0159] (Feature 20) Receiving a system information block 1 (SIB1) including a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability; Obtaining the first parameter or the second parameter included in the SIB1; A program for causing a computer to execute.

[0160] (Feature 21) Obtaining an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (BWP) for a user equipment having a limited bandwidth capability; Transmitting the RRC message to a user equipment (200); A program for causing a computer to execute.

[0161] (Feature 22) Receiving, from a base station (100), an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (BWP) for a user equipment having a limited bandwidth capability; Obtaining the identification information included in the RRC message; A program for causing a computer to execute.

[0162] (Feature 23) To obtain a System Information Block 1 (SIB1), To transmit the SIB1, A computer-readable non-transitory tangible recording medium having recorded thereon a program for causing a computer to execute the above, The SIB1 includes a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability. A computer-readable non-transitory tangible recording medium.

[0163] (Feature 24) To receive a System Information Block 1 (SIB1) including a first parameter indicating the position and bandwidth of a first initial downlink bandwidth part (BWP), and a second parameter indicating the position and bandwidth of a second initial downlink BWP for a user equipment having a limited bandwidth capability, To obtain the first parameter or the second parameter included in the SIB1, A computer-readable non-transitory tangible recording medium having recorded thereon a program for causing a computer to execute the above.

[0164] (Feature 25) To obtain an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (BWP) for a user equipment having a limited bandwidth capability, To transmit the RRC message to a user equipment (200), A computer-readable non-transitory tangible recording medium having recorded thereon a program for causing a computer to execute the above.

[0165] (Feature 26) Receiving, from a base station (100), an RRC (Radio Resource Control) message including identification information for identifying an initial downlink bandwidth part (Bandwidth Part: BWP) for a user equipment having a limited bandwidth capability; Obtaining the identification information included in the RRC message; A computer-readable non-transitory physical recording medium having recorded thereon a program for causing a computer to execute the above.

Explanation of Signs

[0166] 1 System 10 Coverage Area 100 Base Station 141 Information Acquisition Unit 143 Communication Processing Unit 200 User Equipment 231 Information Acquisition Unit 233 Communication Processing Unit

Claims

1. A user equipment, a communication processing unit (233) that receives a System Information Block 1 (SIB1) from a base station, comprising: the communication processing unit, when the SIB1 does not include information indicating that a Reduced Capability user equipment is permitted to access a cell, and the user equipment is the Reduced Capability user equipment, it is regarded as being prohibited from accessing the cell; when the SIB1 includes information indicating that a Reduced Capability user equipment is permitted to access a cell, and the user equipment is the Reduced Capability user equipment, it is regarded as being permitted to access the cell, and the SIB1 includes parameters indicating the position and bandwidth in the frequency domain of a first initial downlink Bandwidth Part (BWP), a parameter indicating the subcarrier spacing of the first initial downlink BWP, parameters indicating the position and bandwidth in the frequency domain of a second initial downlink BWP for the Reduced Capability user equipment, and a parameter indicating the subcarrier spacing of the second initial downlink BWP; when it is regarded as being permitted to access the cell, receiving from the base station using the second initial downlink BWP based on the parameters indicating the position and bandwidth in the frequency domain of the second initial downlink BWP and the parameter indicating the subcarrier spacing of the second initial downlink BWP; a user equipment.

2. The user equipment according to claim 1, wherein the SIB1 includes a parameter indicating the cyclic prefix of the first initial downlink BWP and a parameter indicating the cyclic prefix of the second initial downlink BWP.

3. The SIB1 includes parameters indicating the position and bandwidth in the frequency domain of the first initial uplink BWP, a parameter indicating the subcarrier spacing of the first initial uplink BWP, parameters indicating the position and bandwidth in the frequency domain of the second initial uplink BWP for the Reduced Capability user equipment, and a parameter indicating the subcarrier spacing of the second initial uplink BWP. Based on parameters indicating the position and bandwidth in the frequency domain of the second initial uplink BWP, and a parameter indicating the subcarrier spacing of the second initial uplink BWP, the communication processing unit uses the second initial uplink BWP. The user equipment according to claim 1 or 2.

4. The SIB1 of the user equipment according to claim 3 includes a parameter indicating the cyclic prefix of the first initial uplink BWP and a parameter indicating the cyclic prefix of the second initial uplink BWP.

5. A base station (100) comprises a communication processing unit (143) for transmitting a System Information Block 1 (SIB1) to a user equipment. provided with The communication processing unit when the SIB1 does not include information indicating permission for the Reduced Capability user equipment to access the cell, prohibits the Reduced Capability user equipment from accessing the cell. when the SIB1 includes information indicating that the Reduced Capability user equipment is permitted to access the cell, permits the Reduced Capability user equipment to access the cell, and includes in the SIB1 parameters indicating the position and bandwidth in the frequency domain of the first initial downlink Bandwidth Part (BWP), a parameter indicating the subcarrier spacing of the first initial downlink BWP, parameters indicating the position and bandwidth in the frequency domain of the second initial downlink BWP for the Reduced Capability user equipment, and a parameter indicating the subcarrier spacing of the second initial downlink BWP. A parameter indicating the position and bandwidth of the second initial downlink BWP in the frequency domain, and transmitting to the user equipment using the second initial downlink BWP based on a parameter indicating the subcarrier spacing of the second initial downlink BWP Base station

6. The base station according to claim 5, wherein the SIB1 includes a parameter indicating the cyclic prefix of the first initial downlink BWP and a parameter indicating the cyclic prefix of the second initial downlink BWP

7. The SIB1 includes a parameter indicating the position and bandwidth of the first initial uplink BWP in the frequency domain, a parameter indicating the subcarrier spacing of the first initial uplink BWP, a parameter indicating the position and bandwidth of the second initial uplink BWP for the Reduced Capability user equipment in the frequency domain, and a parameter indicating the subcarrier spacing of the second initial uplink BWP The base station according to claim 5 or 6

8. The base station according to claim 7, wherein the SIB1 includes a parameter indicating the cyclic prefix of the first initial uplink BWP and a parameter indicating the cyclic prefix of the second initial uplink BWP

9. A method performed by a user equipment (200), comprising: Receiving a System Information Block 1 (SIB1) from a base station; If the SIB1 does not include information indicating that a Reduced Capability user equipment is permitted to access the cell, and the user equipment is the Reduced Capability user equipment, it is considered prohibited from accessing the cell; If the SIB1 includes information indicating that a Reduced Capability user equipment is permitted to access the cell, and the user equipment is the Reduced Capability user equipment, it is considered permitted to access the cell, and The SIB1 includes parameters indicating the position and bandwidth in the frequency domain of a first initial downlink bandwidth part (BWP), a parameter indicating the subcarrier spacing of the first initial downlink BWP, parameters indicating the position and bandwidth in the frequency domain of a second initial downlink BWP for the Reduced Capability user equipment, and a parameter indicating the subcarrier spacing of the second initial downlink BWP. When it is considered that access to the cell is permitted, receive from the base station using the second initial downlink BWP based on parameters indicating the position and bandwidth in the frequency domain of the second initial downlink BWP and a parameter indicating the subcarrier spacing of the second initial downlink BWP. A method comprising the above. **Claim 10** A method performed by a base station (100), comprising: Transmitting a System Information Block 1 (SIB1) to a user equipment; When the SIB1 does not include information indicating that access to the cell by the Reduced Capability user equipment is permitted, prohibiting the Reduced Capability user equipment from accessing the cell; When the SIB1 includes information indicating that access to the cell by the Reduced Capability user equipment is permitted, permitting the Reduced Capability user equipment to access the cell, and Including in the SIB1 parameters indicating the position and bandwidth in the frequency domain of a first initial downlink bandwidth part (BWP), a parameter indicating the subcarrier spacing of the first initial downlink BWP, parameters indicating the position and bandwidth in the frequency domain of a second initial downlink BWP for the Reduced Capability user equipment, and a parameter indicating the subcarrier spacing of the second initial downlink BWP. A parameter indicating a position and a bandwidth in a frequency domain of the second initial downlink BWP, and transmitting to the user equipment using the second initial downlink BWP based on a parameter indicating a subcarrier spacing of the second initial downlink BWP. A method comprising the above.

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