WO2023062836A1 - 無線基地局、無線通信システム及び無線通信方法 - Google Patents
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- the present disclosure relates to a radio base station, a radio communication system, and a radio communication method including a central device and a distribution device.
- the 3rd Generation Partnership Project (3GPP) has specified the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and the next generation specification called Beyond 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G We are also proceeding with 5G, 5G Evolution or 6G
- a radio base station consists of a central unit (gNB-CU) connected to the core network and one or more distribution units (gNB-DU) connected to the central unit. It is defined that it can be done (Non-Patent Document 1).
- Inter-gNB CA carrier aggregation
- DC dual connectivity
- Non-Patent Document 2 a terminal (User Equipment, UE) uses multiple radio access technologies (RAT), and a configuration (Multi-RAT Multi-Connectivity) that realizes three or more connectivity simultaneously is also being considered.
- the following disclosure is made in view of this situation, and includes a wireless base station, wireless communication system, and wireless communication that can quickly and efficiently process Inter-gNB CA or Multi-RAT Multi-Connectivity. It aims at providing a method.
- One aspect of the present disclosure includes a first device (DU 110) including a wireless communication unit (wireless communication unit 111) with a terminal (UE 200), and a second device (CU 120) connected to the first device.
- the first device is directly connected to a first device of another radio base station using a specific interface, a control unit (DU control unit 113) for controlling radio communication with the terminal, and a control unit (DU control unit 113) via the specific interface and a transmitting/receiving unit (IF connecting unit 115) that transmits or receives information related to the wireless communication.
- One aspect of the present disclosure is a radio communication system including a terminal and a radio base station, wherein the radio base station is connected to a first device including a radio communication unit with the terminal, and the first device and a second device, wherein the first device is directly connected to the first device of another radio base station using a specific interface, a control unit for controlling radio communication with the terminal, and the specific interface.
- a transmitting/receiving unit configured to transmit or receive information related to the wireless communication via the wireless communication.
- One aspect of the present disclosure is a wireless communication method by a wireless base station configured by a first device including a wireless communication unit with a terminal and a second device connected to the first device, wherein the first a device directly connected to a first device of another radio base station using a specific interface, the first device controlling radio communication with the terminal; transmitting or receiving information regarding said wireless communication via.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10.
- FIG. 2 is a diagram showing a configuration example (Part 1) of Inter-gNB CA.
- FIG. 3 is a diagram showing a configuration example (part 2) of Inter-gNB CA.
- FIG. 4 is a diagram illustrating a configuration example (part 1) of triple connectivity.
- FIG. 5 is a diagram illustrating a configuration example (part 2) of triple connectivity.
- FIG. 6 is a diagram showing an example of control plane models of gNB100 (gNB-CU, gNB-DU) and UE200.
- FIG. 7 is a functional block configuration diagram of gNB100.
- FIG. 8 is a functional block configuration diagram of UE200.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10.
- FIG. 2 is a diagram showing a configuration example (Part 1) of Inter-gNB CA.
- FIG. 3 is a diagram showing a configuration example (part 2) of Inter-gNB CA.
- FIG. 4 is
- FIG. 9 is a diagram showing an example (case 1) of splitting user plane data in Inter-gNB CA.
- FIG. 10 is a diagram showing an example (case 2) of splitting user plane data in Inter-gNB CA.
- FIG. 11 is a diagram showing an example of splitting of user plane data (Case 3) in Inter-gNB CA.
- FIG. 12 is a diagram showing an example of splitting of user plane data in Inter-gNB CA (Case 4).
- FIG. 13 is a diagram illustrating a procedure example 1 of scheduling and coordination.
- FIG. 14 is a diagram illustrating a procedure example 2 of scheduling and coordination.
- FIG. 15 is a diagram illustrating a procedure example 3 of scheduling and coordination.
- FIG. 16 is a diagram illustrating a procedure example 4 of scheduling and coordination.
- FIG. 17 is a diagram showing an example of the hardware configuration of gNB100 and UE200.
- FIG. 18 is a diagram showing a configuration example of the vehicle 2001. As shown in FIG.
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10 according to the present embodiment.
- the radio communication system 10 is a radio communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter NG-RAN 20 and terminals 200 (User Equipment 200, hereinafter UE 200).
- NG-RAN 20 Next Generation-Radio Access Network 20
- UE 200 User Equipment 200
- the wireless communication system 10 may be a wireless communication system according to a system called Beyond 5G, 5G Evolution or 6G, or a wireless communication system according to a system called Long Term Evolution (LTE) or 4G. good.
- LTE Long Term Evolution
- NG-RAN 20 includes a radio base station 100 (hereinafter gNB 100).
- gNB 100 radio base station 100
- the specific configuration of the radio communication system 10 including the number of gNBs (eNBs or the like may be used) and UEs is not limited to the example shown in FIG.
- NG-RAN 20 actually includes multiple NG-RAN Nodes, specifically gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown).
- Access and Mobility Management Function (AMF), Session Management Function (SMF), etc. which are included in the 5G system architecture and provide access and mobility management functions for UE 200, are connected to NG-RAN20.
- AMF Access and Mobility Management Function
- SMF Session Management Function
- NG-RAN 20 and 5GC may simply be referred to as a "network”.
- the gNB100 is an NR-compliant radio base station and performs NR-compliant radio communication with the UE200.
- the gNB 100 may be composed of a gNB-CU (Central Unit) and a gNB-DU (Distributed Unit), and the DU may be separated from the CU and installed in a geographically different location.
- gNB-CU Central Unit
- gNB-DU Distributed Unit
- the gNB-DU has a wireless communication unit with the UE200.
- a gNB-DU may be called a first device, a distribution device, or the like.
- gNB-CU is connected with gNB-DU.
- a gNB-CU is connected to one or more gNB-DUs via an F1 interface, which is an interface defined in 3GPP.
- a gNB-CU may also be called a secondary device, a central device, or the like.
- CA may include Inter-gNB CA, which is CA between different gNBs 100 .
- the gNB100 and UE200 perform radio communication via radio bearers, specifically Signaling Radio Bearer (SRB) or DRB Data Radio Bearer (DRB).
- SRB Signaling Radio Bearer
- DRB DRB Data Radio Bearer
- Multi-Radio Dual Connectivity specifically E-UTRA, in which one gNB 100 constitutes a master node (MN) and the other gNB 100 constitutes a secondary node (SN) -NR Dual Connectivity (EN-DC) can be performed.
- MN master node
- SN secondary node
- EN-DC Dual Connectivity
- Any gNB 100 may be included in the master cell group (MCG), and the other gNB 100 may be included in the secondary cell group (SCG).
- the gNB 100 (gNB-CU, gNB-DU) may be called a radio base station or network equipment.
- the type of DC may be Multi-RAT Dual Connectivity (MR-DC), which uses multiple radio access technologies, or NR-NR Dual Connectivity (NR-DC), which uses only NR.
- MR-DC may also be E-UTRA-NR Dual Connectivity (EN-DC), where eNB constitutes the master node (MN) and gNB constitutes the secondary node (SN), or vice versa NR -E-UTRA Dual Connectivity (NE-DC) is acceptable.
- MCG and SCG may be set.
- the MCG may include a primary cell (PCell), and the SCG may include a secondary cell (SCell).
- PCell primary cell
- SCell secondary cell
- the SCell may include a primary/secondary cell (PSCell).
- PSCell is a type of SCell, but may be interpreted as a special SCell having functions equivalent to those of a PCell.
- PUCCH Physical Uplink Control Channel
- CBRA contention type random access procedure
- Radio Link Monitoring downlink radio quality monitoring
- UE200 can support dual connectivity in which two gNB100s (which may be read as gNB-DU) are connected simultaneously, or triple connectivity in which three gNB100s (gNB-DU) are simultaneously connected. Since UE200 can support MR-DC, it can also support Multi-RAT Multi-Connectivity, which uses multiple radio access technologies (RAT) and realizes three or more connectivity simultaneously.
- RAT radio access technologies
- Fig. 2 shows a configuration example (Part 1) of Inter-gNB CA.
- CU1 and CU2 may be connected by an Xn interface
- CU1 and DU1 and CU2 and DU2 may be connected by an F1 interface.
- D2 new interface
- D2 may have a control plane (D2-C) and a user plane (D2-U).
- DU1 may form a PCell (for example, CC #1 is used) and DU2 may form a SCell (for example, CC #2 is used) (same below).
- DU1 may be called a master DU (M-DU) and DU2 may be called a secondary DU (S-DU).
- M-DU master DU
- S-DU secondary DU
- UE 200 performs radio communication with DU1 and DU2, and uses uplink channels (PDSCH (Physical Downlink Shared Channel), PDCCH (Physical Downlink Control Channel)) and downlink channels (PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel) can be set respectively, and the channel with SCell (DU2) does not have to be set.
- PDSCH Physical Downlink Shared Channel
- PDCCH Physical Downlink Control Channel
- PUSCH Physical Uplink Shared Channel
- PUCCH Physical Uplink Control Channel
- various signaling may be performed via the D2 interface to support Inter-gNB CA.
- the signaling may be performed at the physical layer (PHY), the medium access control layer (MAC) or the radio link control layer (RLC), or at higher layers such as the radio resource control layer (RRC).
- PHY physical layer
- MAC medium access control layer
- RLC radio link control layer
- RRC radio resource control layer
- Fig. 3 shows a configuration example (part 2) of Inter-gNB CA.
- DU1 and DU2 may be connected to the same CU.
- multiple DUs may be connected to the CU.
- DU1 and DU2 may be connected by the D2 interface.
- FIG. 4 shows a configuration example (part 1) of triple connectivity.
- MN may be connected with SN1 and SN2 by Xn interface.
- the MN may be connected with DU1 through the F1 interface.
- SN1 and SN2 may also be connected with DU2 and DU3 respectively by the F1 interface.
- DU1-DU2, DU1-DU3, and DU2-DU3 may be connected by D2 interfaces, respectively.
- the UE 200 may perform radio communication with DU1, DU2 and DU3 and configure uplink and downlink channels.
- DU2 may form a PSCell (eg, CC #2 is used)
- DU3 may form a PSCell and a SCell (eg, CC #3, 4 are used).
- FIG. 5 shows a configuration example (part 2) of triple connectivity. As shown in FIG. 5, MN may be connected with SN1 by an Xn interface.
- the MN may be connected with DU1 through the F1 interface.
- SN1 may be connected to DU2 and DU3 via the F1 interface. That is, multiple DUs may be connected to the SN.
- DU1-DU2, DU1-DU3, and DU2-DU3 may be connected by D2 interfaces, respectively.
- DU2 may form a PSCell (for example, CC #2 is used), and DU3 may form a SCell (for example, CC #3 is used).
- Fig. 6 shows an example of a control plane model of gNB100 (gNB-CU, gNB-DU) and UE200. As shown in FIG. 6, only the M-DU terminates the RRC layer, and SCell configuration information may be provided via the M-DU ((1) in the figure).
- the M-DU and S-DU may terminate the RRC layer, and setting negotiation may be performed between the M-DU and S-DU ((2) in the figure). Considering the ease of mounting, etc., the mode (1) is considered to be preferable.
- FIG. 7 is a functional block configuration diagram of gNB100.
- FIG. 8 is a functional block configuration diagram of UE200. Note that FIGS. 7 and 8 show only main functional blocks related to the description of the embodiment, and that the gNB 100 and UE 200 have other functional blocks (eg, power supply units, etc.). . 7 and 8 show functional block configurations of the gNB 100 and UE 200, and please refer to FIG. 17 for the hardware configuration.
- the gNB100 may consist of DU110 and CU120. Note that the number of DUs 110 and CUs 120 that make up the gNB 100 is not particularly limited.
- the DU 110 includes a radio communication section 111, a DU control section 113 and an IF connection section 115.
- CU 120 also includes CU control section 121 and IF connection section 123 .
- DU 110 may function as an M-DU or S-DU.
- the radio communication unit 111 transmits a downlink signal (DL signal) according to NR. Also, the DU 110 receives an uplink signal (UL signal) according to NR.
- DL signal downlink signal
- UL signal uplink signal
- the DU control unit 113 can control the wireless communication unit 111 and the IF connection unit 115, and can control wireless communication with the UE200.
- the DU control section 113 may constitute a control section.
- the DU control unit 113 can perform various signaling and processing with the UE 200 in the PHY, MAC, and RLC layers. Also, DU control section 113 can perform signaling and processing in the layer with DUs of other gNBs 100 (other radio base stations).
- the IF connection unit 115 provides functions necessary for connection with the CU 120 via the F1 interface and connection with other DUs via the D2 interface (specific interface). As noted above, DUs 110 can connect directly to other gNBs 100 (gNB-DUs) using the D2 interface.
- the IF connection unit 115 can transmit or receive information regarding wireless communication with the UE 200 via the D2 interface.
- the IF connection unit 115 may constitute a transmission/reception unit.
- IF connection section 115 can transmit or receive information indicating the state of the radio link with UE 200 in SCell (which may include PSCell; hereinafter the same).
- the information indicating the state of the radio link may be interpreted as information on the uplink control channel with the UE 200 in the SCell, the uplink medium access control layer control element (MAC-CE), and the radio link control layer (RLC).
- MAC-CE uplink medium access control layer control element
- RLC radio link control layer
- information indicating the state of a radio link includes acknowledgment (ACK)/negative acknowledgment (NACK) of HARQ (Hybrid Automatic repeat request) in SCell (which may be read as CC), Channel State Information (CSI), scheduling Request (SR), Buffer Status Report (BSR), etc. may be included.
- ACK acknowledgment
- NACK negative acknowledgment
- CSI Channel State Information
- SR scheduling Request
- BSR Buffer Status Report
- the IF connecting section 115 can transmit or receive at least one of the downlink control channel with the UE 200 in SCell, the control elements of the medium access control layer (MAC-CE), and the information on the radio link control layer (RLC).
- MAC-CE medium access control layer
- RLC radio link control layer
- IF connection section 115 provides information on SCell PDCCH (eg, Carrier indicator, BWP (Bandwidth part) indicator, etc.), information on MAC-CE (eg, TA (timing advance), DRX (Discontinuous Reception) command, etc.) and acknowledgment (ACK)/negative acknowledgment (NACK) in RLC AM (Acknowledged Mode) can be sent or received.
- SCell PDCCH eg, Carrier indicator, BWP (Bandwidth part) indicator, etc.
- MAC-CE eg, TA (timing advance), DRX (Discontinuous Reception) command, etc.
- ACK acknowledgment
- NACK negative acknowledgment
- RLC AM Acknowledged Mode
- IF connection section 115 can transmit or receive scheduling information used to determine the scheduling priority of UE200. Specifically, IF connection section 115 can transmit or receive information that serves as an index for determining uplink (UL) scheduling priority among multiple UEs 200 .
- UL uplink
- the information may include an average data rate and/or an achievable data rate.
- the scheduling method is not particularly limited, for example, PF (Proportional Fair) scheduling may be applied.
- the CU control unit 121 of the CU 120 can execute various signaling and processing in higher layers with the UE 200, specifically, the packet data convergence protocol layer (PDCP) and the radio resource control layer (RRC). Also, the CU control unit 121 can control the IF connection unit 123 .
- PDCP packet data convergence protocol layer
- RRC radio resource control layer
- the IF connection unit 123 provides functions necessary for connection with the DU 110 via the F1 interface and connection with various nodes that make up the NG-RAN 20 and core network (5GC).
- the IF connection unit 123 may be connected to a plurality of DUs 110 via F1 interfaces, respectively, as described above.
- UE 200 includes radio communication section 210 , MAC processing section 220 , RRC processing section 230 and control section 240 .
- the radio communication unit 210 transmits an uplink signal (UL signal) according to NR. Also, the radio communication unit 210 receives an uplink signal (DL signal) according to NR.
- UL signal uplink signal
- DL signal uplink signal
- the MAC processing unit 220 executes various processes in the medium access control layer (MAC). Specifically, the MAC processing unit 220 is capable of transmitting and receiving a medium access control layer control element (MAC-CE).
- MAC-CE medium access control layer control element
- the MAC processing unit 220 may support MAC-CE defined in 3GPP TS38.321 or the like.
- the RRC processing unit 230 executes various processes in the radio resource control layer (RRC). Specifically, RRC processing section 230 can transmit and receive radio resource control layer messages to and from gNB 100 (CU 120).
- RRC radio resource control layer
- the UE 200 may also perform layer processing other than MAC and RRC.
- layer 1 may be interpreted to include lower layers such as the physical layer.
- Layer 3 is a higher layer than layer 1 .
- the higher layers may include a radio link control layer (RLC), a packet data convergence protocol layer (PDCP), a radio resource control layer (RRC) and/or a medium access control layer (MAC ) may be positioned between the lower layer and the upper layer.
- RLC radio link control layer
- PDCP packet data convergence protocol layer
- RRC radio resource control layer
- MAC medium access control layer
- control channels may be PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Downlink Control Information (DCI) including Random Access Radio Network Temporary Identifier (RA-RNTI)), and Physical Broadcast Channel (PBCH) may be included.
- PDCCH Physical Downlink Control Channel
- PUCCH Physical Uplink Control Channel
- RACH Random Access Channel
- DCI Downlink Control Information
- RA-RNTI Random Access Radio Network Temporary Identifier
- PBCH Physical Broadcast Channel
- Data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data may refer to data transmitted over a data channel.
- PDSCH Physical Downlink Shared Channel
- PUSCH Physical Uplink Shared Channel
- the control unit 240 controls each functional block that configures the UE200.
- the control unit 240 can perform control regarding Inter-gNB CA and triple connectivity (which may include Multi-RAT Multi-Connectivity).
- control unit 240 can set radio links (radio bearers) with each of the plurality of gNBs 100 via uplink channels and downlink channels, and execute signaling and processing in each layer.
- radio links radio bearers
- Radio Communication System 10 (4) Operation of Radio Communication System Next, the operation of the radio communication system 10 will be described. Specifically, operations related to Inter-gNB CA and triple connectivity between gNB 100 and UE 200 in which a D2 interface (tentative name) between DUs is set will be described.
- CA carrier aggregation
- FR2 24.25 GHz to 52.6 GHz
- high frequency bands exceeding 52.6 GHz There is a need to.
- Inter-gNB CA when adding a new frequency band, simply add another new gNB, which simplifies operations and is convenient.
- FIG. 9 shows an example (case 1) of splitting user plane data in Inter-gNB CA.
- shaded square frames represent packets, and numbers within the frames indicate packet numbers (order) (same below).
- CU1 is connected with M-DU and CU2 is connected with S-DU.
- User plane (U-plane) data packets 1-3 may be split from CU1 via the Xn-U interface.
- packets 1 and 3 are transmitted via M-DU, and packet 2 is transmitted via S-DU.
- FIG. 10 shows an example of splitting user plane data in Inter-gNB CA (Case 2).
- one CU is connected with M-DU and S-DU.
- U-plane data packets 1-3
- packets 1 and 3 are transmitted via M-DU
- packet 2 is transmitted via S-DU.
- FIG. 11 shows an example of splitting user plane data in Inter-gNB CA (Case 3). Also in FIG. 11, one CU is connected with M-DU and S-DU. U-plane data (packets 1-3) may be split from the CU. In the example of FIG. 11, packets 1 and 3 are transmitted via M-DU, and packet 2 is transmitted via S-DU.
- FIG. 12 shows an example of splitting user plane data in Inter-gNB CA (Case 4). Also in FIG. 12, one CU is connected with M-DU and S-DU. U-plane data (packets 1-3) are not split in the CU, but split in the M-DU.
- the M-DU transfers packet 2 to the S-DU via the D2 interface.
- the S-DU sends forwarded packet 2 to the UE.
- packets 1 and 3 are transmitted via M-DU, and packet 2 is transmitted via S-DU.
- the M-DU and S-DU may send or receive the following information via the D2 interface described above.
- a DU (DU who holds PCell or PSCell) that forms a PCell or PSCell uses a secondary CC (SCC) (which may be read as forming an SCell) DU (who holds SCC), At least one of the following information may be transmitted via the D2 interface (or it may be transmitted in the opposite direction, or via the Xn interface or the F1 interface, and so on).
- SCC secondary CC
- ⁇ HARQ-ACK/NACK in SCell eg CC#2
- SCell eg CC#2
- SR Service Status Report
- PSR Power Headroom Report
- MAC CE BFR (Beam Failure Reprot)
- LBT Listen-Before-Talk
- MAC CE Multiple Entry Configured Grant Confirmation
- Guard Symbols MAC CE ⁇ RLC AM ACK/NACK, RLC segment size control info
- a DU that uses SCC (DU who holds SCC) sends at least one of the following information to a DU that forms PCell or PSCell (DU who holds PCell or PSCell) via the D2 interface. you can
- the MN or SN may determine the SN (S-DU) forming the PSCell.
- the MN may instruct the SN forming the PSCell at the timing of SN addition/modification, or the SN forming the PSCell in the MN at the timing of switching between Inter-gNB CA and DC. may require a determination of Also, Inter-gNB CA and DC may be switched in the SN/gNB modification procedure depending on radio quality, gNB load condition, or required reliability.
- a message regarding a DU addition, change or release procedure (DU addition/DU modification/DU change/DU release) using the D2 interface is defined, and DU addition etc. may be performed using this message. .
- PF Proportional Fair
- information serving as an index for determining scheduling priority such as average data rate and achievable data rate, may be reported from S-DU to M-DU or from M-DU to S-DU. That is, information related to the scheduler in the gNB may be shared between the M-DU and the S-DU.
- M-DUs and S-DUs may advertise and/or negotiate scheduler parameters, such as parameters that determine scheduling fairness and scheduling priorities between M-DUs and S-DUs. .
- FIG. 13 shows a procedure example 1 of scheduling and coordination.
- the M-DU determines the scheduling policy.
- the S-DU notifies the M-DU of the UE's average data rate and achievable data rate (either one is acceptable).
- the M-DU may determine UE scheduling and transmit scheduling information and/or user data to the S-DU.
- the S-DU confirms the scheduling information and may (optionally) return an acknowledgment (ACK) or a rejection.
- ACK acknowledgment
- FIG. 14 shows a procedure example 2 of scheduling coordination.
- the S-DU determines the scheduling policy.
- the M-DU notifies the S-DU of the UE's average data rate and achievable data rate (either one is acceptable).
- the S-DU may determine UE scheduling and send data requests and/or scheduling information to the M-DU.
- the M-DU may also send scheduling information and/or user data to the S-DU.
- FIG. 15 shows a procedure example 3 of scheduling and coordination.
- user data U-plane data
- M-DU determines the scheduling policy.
- the M-DU may determine the scheduling of the UE and only send the scheduling information to the S-DU.
- FIG. 16 shows a procedure example 4 of scheduling coordination.
- user data U-plane data
- S-DU determines the scheduling policy.
- the S-DU may decide the scheduling of the UE and only send the scheduling information to the M-DU.
- the DUs are directly connected via the D2 interface, enabling quick and efficient processing via the D2 interface.
- the introduction of the D2 interface can support Inter-gNB CA or triple connectivity (which may include Multi-RAT Multi-Connectivity), and efficient exchange of various control information via the D2 interface. becomes possible. This is expected to facilitate the smooth introduction of Inter-gNB CA and triple connectivity.
- information indicating the state of the radio link with UE 200 in SCell (which may include PSCell; hereinafter the same), a downlink control channel with UE 200 in SCell, and control elements of the medium access control layer via the D2 interface.
- MAC-CE radio link control layer
- RLC radio link control layer
- the name of the D2 interface was used, but this name is a tentative name and may be called by another name.
- the gNB-DU may be called an outrigger device, a remote device, etc. in addition to the distribution device, and the gNB-CU may be called an aggregation device, main device, etc. in addition to the central device.
- configure, activate, update, indicate, enable, specify, and select may be read interchangeably. good.
- link, associate, correspond, and map may be read interchangeably to allocate, assign, monitor. , map, may also be read interchangeably.
- each functional block may be implemented using one device physically or logically coupled, or directly or indirectly using two or more physically or logically separate devices (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices.
- a functional block may be implemented by combining software in the one device or the plurality of devices.
- Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't
- a functional block (component) that performs transmission is called a transmitting unit or transmitter.
- the implementation method is not particularly limited.
- FIG. 17 is a diagram showing an example of the hardware configuration of the device.
- the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.
- the term "apparatus” can be read as a circuit, device, unit, or the like.
- the hardware configuration of the device may be configured to include one or more of each device shown in the figure, or may be configured without some of the devices.
- Each functional block of the device (see Fig. 7.8) is realized by any hardware element of the computer device or a combination of the hardware elements.
- each function of the device is implemented by causing the processor 1001 to perform calculations, controlling communication by the communication device 1004, and controlling the It is realized by controlling at least one of data reading and writing in 1002 and storage 1003 .
- a processor 1001 operates an operating system and controls the entire computer.
- the processor 1001 may be configured with a central processing unit (CPU) including interfaces with peripheral devices, a controller, arithmetic units, registers, and the like.
- CPU central processing unit
- the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them.
- programs program codes
- software modules software modules
- data etc.
- the various processes described above may be executed by one processor 1001, or may be executed by two or more processors 1001 simultaneously or sequentially.
- Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.
- the memory 1002 is a computer-readable recording medium, and is composed of at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. may be
- ROM Read Only Memory
- EPROM Erasable Programmable ROM
- EEPROM Electrically Erasable Programmable ROM
- RAM Random Access Memory
- the memory 1002 may also be called a register, cache, main memory (main storage device), or the like.
- the memory 1002 can store programs (program code), software modules, etc. capable of executing a method according to an embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disc, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, and/or the like.
- Storage 1003 may also be referred to as an auxiliary storage device.
- the recording medium described above may be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003 .
- the communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like.
- the communication device 1004 includes a high-frequency switch, duplexer, filter, frequency synthesizer, etc., for realizing at least one of frequency division duplex (FDD) and time division duplex (TDD).
- FDD frequency division duplex
- TDD time division duplex
- the input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from the outside.
- the output device 1006 is an output device (eg, display, speaker, LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated (for example, a touch panel).
- each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information.
- the bus 1007 may be configured using a single bus, or may be configured using different buses between devices.
- the device includes hardware such as a microprocessor, digital signal processor (DSP), application specific integrated circuit (ASIC), programmable logic device (PLD), field programmable gate array (FPGA), etc.
- DSP digital signal processor
- ASIC application specific integrated circuit
- PLD programmable logic device
- FPGA field programmable gate array
- notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods.
- the notification of information may include physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), other signals, or combinations thereof, and RRC signaling may also be referred to as RRC messages, e.g., RRC Connection Setup ) message, RRC Connection Reconfiguration message, or the like.
- DCI Downlink Control Information
- UCI Uplink Control Information
- RRC signaling e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), other signals, or combinations thereof
- RRC signaling may also be referred to as RRC messages, e.g., RRC Connection Setup ) message, R
- LTE Long Term Evolution
- LTE-A LTE-Advanced
- SUPER 3G IMT-Advanced
- 4G 4th generation mobile communication system
- 5G 5th generation mobile communication system
- Future Radio Access FAA
- New Radio NR
- W-CDMA registered trademark
- GSM registered trademark
- CDMA2000 Code Division Multiple Access 2000
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®, other suitable systems, and/or next-generation systems enhanced therefrom.
- a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).
- a specific operation that is performed by a base station in the present disclosure may be performed by its upper node in some cases.
- various operations performed for communication with a terminal may be performed by the base station and other network nodes other than the base station (e.g. MME or S-GW, etc., but not limited to).
- MME or S-GW network nodes
- the case where there is one network node other than the base station is exemplified above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).
- Information, signals can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.
- Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input and output information may be overwritten, updated, or appended. The output information may be deleted. The entered information may be transmitted to other devices.
- the determination may be made by a value represented by one bit (0 or 1), by a true/false value (Boolean: true or false), or by numerical comparison (for example, a predetermined value).
- notification of predetermined information is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.
- Software whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- the Software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to access websites, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.
- wired technology coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.
- wireless technology infrared, microwave, etc.
- data, instructions, commands, information, signals, bits, symbols, chips, etc. may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of
- the channel and/or symbols may be signaling.
- a signal may also be a message.
- a component carrier may also be called a carrier frequency, a cell, a frequency carrier, or the like.
- system and “network” used in this disclosure are used interchangeably.
- information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information.
- radio resources may be indexed.
- base station BS
- radio base station fixed station
- NodeB NodeB
- eNodeB eNodeB
- gNodeB gNodeB
- a base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.
- a base station can accommodate one or more (eg, three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area corresponding to a base station subsystem (e.g., a small indoor base station (Remote Radio)). Head: RRH) can also provide communication services.
- a base station subsystem e.g., a small indoor base station (Remote Radio)
- Head: RRH can also provide communication services.
- cell refers to part or all of the coverage area of at least one of a base station and base station subsystem that provides communication services in this coverage.
- MS Mobile Station
- UE User Equipment
- a mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.
- At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like.
- the mobile body may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile body (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ).
- at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations.
- at least one of the base station and mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read as a mobile station (user terminal, hereinafter the same).
- communication between a base station and a mobile station is replaced with communication between multiple mobile stations (for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.)
- the mobile station may have the functions that the base station has.
- words such as "up” and “down” may be replaced with words corresponding to inter-terminal communication (for example, "side”).
- uplink channels, downlink channels, etc. may be read as side channels.
- a radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be a fixed time length (eg, 1 ms) independent of numerology.
- a numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, transmission and reception specific filtering operations performed by the receiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, and/or the like.
- SCS subcarrier spacing
- TTI transmission time interval
- number of symbols per TTI radio frame structure
- transmission and reception specific filtering operations performed by the receiver in the frequency domain specific windowing operations performed by the transceiver in the time domain, and/or the like.
- a slot may consist of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain.
- OFDM Orthogonal Frequency Division Multiplexing
- SC-FDMA Single Carrier Frequency Division Multiple Access
- a slot may be a unit of time based on numerology.
- a slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot.
- a PDSCH (or PUSCH) that is transmitted in time units larger than a minislot may be referred to as PDSCH (or PUSCH) mapping type A.
- PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.
- Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.
- one subframe may be called a transmission time interval (TTI)
- TTI transmission time interval
- multiple consecutive subframes may be called a TTI
- one slot or one minislot may be called a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, may be a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms may be Note that the unit representing the TTI may be called a slot, minislot, or the like instead of a subframe.
- TTI refers to, for example, the minimum scheduling time unit in wireless communication.
- a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis.
- radio resources frequency bandwidth, transmission power, etc. that can be used by each user terminal
- the TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, codewords, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.
- one slot or one minislot is called a TTI
- one or more TTIs may be the minimum scheduling time unit.
- the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.
- a TTI with a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc.
- TTI that is shorter than a regular TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, and so on.
- long TTI for example, normal TTI, subframe, etc.
- short TTI for example, shortened TTI, etc.
- a TTI having a TTI length greater than or equal to this value may be read as a replacement.
- a resource block is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain.
- the number of subcarriers included in an RB may be the same regardless of neurology, and may be 12, for example.
- the number of subcarriers included in an RB may be determined based on neumerology.
- the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long.
- One TTI, one subframe, etc. may each consist of one or more resource blocks.
- One or more RBs are physical resource blocks (Physical RB: PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. may be called.
- PRB Physical resource blocks
- SCG sub-carrier groups
- REG resource element groups
- PRB pairs RB pairs, etc.
- a resource block may be composed of one or more resource elements (Resource Element: RE).
- RE resource elements
- 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.
- a Bandwidth Part (which may also be called a Bandwidth Part) represents a subset of contiguous common resource blocks (RBs) for a neumerology in a carrier. good.
- the common RB may be identified by an RB index based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
- BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP).
- One or more BWPs may be configured in one carrier for a UE.
- At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP.
- BWP bitmap
- radio frames, subframes, slots, minislots and symbols described above are only examples.
- the number of subframes included in a radio frame the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of Configurations such as the number of subcarriers and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc.
- CP cyclic prefix
- connection means any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being “connected” or “coupled.” Couplings or connections between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as "access”.
- two elements are defined using at least one of one or more wires, cables and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions, and the like.
- the reference signal can also be abbreviated as Reference Signal (RS), and may also be called Pilot depending on the applicable standard.
- RS Reference Signal
- any reference to elements using the "first,” “second,” etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, references to first and second elements do not imply that only two elements may be employed therein or that the first element must precede the second element in any way.
- determining and “determining” used in this disclosure may encompass a wide variety of actions.
- “Judgement” and “determination” are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (eg, lookup in a table, database, or other data structure), ascertaining as “judged” or “determined”, and the like.
- "judgment” and “determination” are used for receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (accessing) (for example, accessing data in memory) may include deeming that a "judgment” or “decision” has been made.
- judgment and “decision” are considered to be “judgment” and “decision” by resolving, selecting, choosing, establishing, comparing, etc. can contain.
- judgment and “decision” may include considering that some action is “judgment” and “decision”.
- judgment (decision) may be read as “assuming”, “expecting”, “considering”, or the like.
- a and B are different may mean “A and B are different from each other.”
- the term may also mean that "A and B are different from C”.
- Terms such as “separate,” “coupled,” etc. may also be interpreted in the same manner as “different.”
- FIG. 18 shows a configuration example of a vehicle 2001.
- a vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, an electronic control unit 2010, It has various sensors 2021 to 2029, an information service unit 2012 and a communication module 2013.
- the driving unit 2002 is composed of, for example, an engine, a motor, or a hybrid of the engine and the motor.
- the steering unit 2003 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels and rear wheels based on the operation of the steering wheel operated by the user.
- a steering wheel also referred to as a steering wheel
- the electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals from various sensors 2021 to 2027 provided in the vehicle are input to the electronic control unit 2010 .
- the electronic control unit 2010 may be called an ECU (Electronic Control Unit).
- the signals from various sensors 2021 to 2028 include the current signal from the current sensor 2021 that senses the current of the motor, the rotation speed signal of the front and rear wheels obtained by the rotation speed sensor 2022, and the front wheel obtained by the air pressure sensor 2023. and rear wheel air pressure signal, vehicle speed signal obtained by vehicle speed sensor 2024, acceleration signal obtained by acceleration sensor 2025, accelerator pedal depression amount signal obtained by accelerator pedal sensor 2029, brake pedal sensor 2026 obtained by There are a brake pedal depression amount signal, a shift lever operation signal acquired by the shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028, and the like.
- the information service unit 2012 includes various devices such as car navigation systems, audio systems, speakers, televisions, and radios for providing various information such as driving information, traffic information, and entertainment information, and one or more devices for controlling these devices. It consists of an ECU and The information service unit 2012 uses information acquired from an external device via the communication module 2013 and the like to provide passengers of the vehicle 1 with various multimedia information and multimedia services.
- Driving support system unit 2030 includes millimeter wave radar, LiDAR (Light Detection and Ranging), camera, positioning locator (e.g. GNSS), map information (e.g. high-definition (HD) map, autonomous vehicle (AV) map, etc. ), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors to prevent accidents and reduce the driver's driving load. and one or more ECUs that control these devices.
- the driving support system unit 2030 transmits and receives various information via the communication module 2013, and realizes a driving support function or an automatic driving function.
- the communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via communication ports.
- the communication module 2013 communicates with the vehicle 2001 through a communication port 2033 a driving unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, Data is sent and received between axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in electronic control unit 2010, and sensors 2021-2028.
- the communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with an external device. For example, it transmits and receives various information to and from an external device via wireless communication.
- Communication module 2013 may be internal or external to electronic control 2010 .
- the external device may be, for example, a base station, a mobile station, or the like.
- the communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to the external device via wireless communication.
- the communication module 2013 receives, from the electronic control unit 2010, the rotation speed signals of the front and rear wheels obtained by the rotation speed sensor 2022, the air pressure signals of the front and rear wheels obtained by the air pressure sensor 2023, and the vehicle speed sensor. 2024, the acceleration signal obtained by the acceleration sensor 2025, the accelerator pedal depression amount signal obtained by the accelerator pedal sensor 2029, the brake pedal depression amount signal obtained by the brake pedal sensor 2026, and the shift lever.
- a shift lever operation signal obtained by the sensor 2027 and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 2028 are also transmitted to an external device via wireless communication.
- the communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from external devices and displays it on the information service unit 2012 provided in the vehicle. Communication module 2013 also stores various information received from external devices in memory 2032 available to microprocessor 2031 . Based on the information stored in the memory 2032, the microprocessor 2031 controls the driving unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the left and right front wheels 2007, and the left and right rear wheels provided in the vehicle 2001. 2008, axle 2009, sensors 2021-2028, etc. may be controlled.
- various information traffic information, signal information, inter-vehicle information, etc.
- Radio communication system 20 NG-RAN 100 gNB 110DU 111 Wireless communication unit 113 DU control unit 115 IF connection unit 120 CU 121 CU control unit 123 IF connection unit 200 UE 210 wireless communication unit 220 MAC processing unit 230 RRC processing unit 240 control unit 1001 processor 1002 memory 1003 storage 1004 communication device 1005 input device 1006 output device 1007 bus 2001 vehicle 2002 drive unit 2003 steering unit 2004 accelerator pedal 2005 brake pedal 2006 shift lever Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Revolution sensor 2023 Air pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving support system 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 communication port
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Abstract
Description
図1は、本実施形態に係る無線通信システム10の全体概略構成図である。無線通信システム10は、5G New Radio(NR)に従った無線通信システムであり、Next Generation-Radio Access Network 20(以下、NG-RAN20、及び端末200(User Equipment 200、以下、UE200)を含む。
次に、gNB-DUとgNB-CUとによって構成されるgNB100(無線基地局)と、UE200とによるInter-gNB CA及びトリプルコネクティビティの構成例について説明する。
次に、無線通信システム10の機能ブロック構成について説明する。具体的には、gNB100及びUE200の機能ブロック構成について説明する。
図7に示すように、gNB100は、DU110及びCU120によって構成されてよい。なお、gNB100を構成するDU110及びCU120の数は、特に限定されない。
図8に示すように、UE200は、無線通信部210、MAC処理部220、RRC処理部230及び制御部240を備える。
次に、無線通信システム10の動作について説明する。具体的には、DU間のD2インターフェース(仮称)が設定されたgNB100と、UE200との間におけるInter-gNB CA及びトリプルコネクティビティに関する動作について説明する。
UE200のより高いスループット実現には、FR2(24.25 GHz~52.6 GHz)或いは52.6GHzを超えるような高周波数帯域において、キャリアアグリゲーション(CA)またはデュアルコネクティビティ(或いはトリプルコネクティビティ)を適用する必要がある。
次に、Inter-gNB CAにおけるユーザプレーンデータのスプリットの例について説明する。図9は、Inter-gNB CAにおけるユーザプレーンデータのスプリット例(ケース1)を示す。図9において、網掛けされた四角枠は、パケットを意味し、枠内の番号は、パケット番号(順番)を示している(以下同)。
以下では、Inter-gNB CAに関する動作例について説明する。具体的には、D2インターフェースを介して送受信される制御情報、及びUE200のスケジューリング優先度の決定に関する動作例について説明する。
M-DU及びS-DUは、上述したD2インターフェースを経由して、次のような情報を送信または受信してよい。
・SCell(e.g. CC#2)におけるCSI report
・SR(Scheduling Request), BSR(Buffer Status Report)
・PHR (Power Headroom Report ) MAC CE, BFR (Beam Failure Reprot) MAC CE, LBT (Listen-Before-Talk) failure MAC CE, Multiple Entry Configured Grant Confirmation MAC CE, Guard Symbols MAC CE
・RLC AM ACK/NACK, RLC segement size control info
また、SCCを用いるDU(DU who holds SCC)は、PCellまたはPSCellを形成するDU(DU who holds PCell or PSCell)に対して、D2インターフェースを経由して、次の情報の少なくとも何れかを送信してよい。
・Carrier indicator
・BWP indicator
・Frequency domain resource assignment (FDRA)
・time domain resource assignment (TDRA)
・frequency hopping flag
・MCS (Modulation and Coding Scheme)
・new data indicator
・redundancy version
・HARQ process number
・TPC (Transmit Power Control) command for scheduled PUSCH
・UL/SUL (Supplementary Uplink) indicator
・CSI request
・MAC-CE関連情報
・TA (timing advance)
・DRX command
・SCell (de)activation
・PDCP duplication (de)activation
・Duplication RLC Activation/Deactivation MAC CE
・SP CSI-RS/CSI-IM Resource Set Activation/Deactivation
・Aperiodic CSI Trigger State Subselection MAC CE
・(Enhanced)TCI States Activation/Deactivation for UE-specific PDSCH MAC CE
・TCI State Indication for UE-specific PDCCH MAC CE
・SP (Semi-Persistent) CSI reporting on PUCCH Activation/Deactivation MAC CE
・SP SRS (Sounding Reference Signal) Activation/Deactivation MAC CE
・(Enhanced) PUCCH spatial relation Activation/Deactivation MAC CE
・SP ZP (Zero Power) CSI-RS Resource Set Activation/Deactivation MAC CE
・Timing Delta MAC CE
・Enhanced SP/AP SRS Spatial Relation Indication MAC CE
・SRS Pathloss Reference RS Update MAC CE
・PUSCH Pathloss Reference RS Update MAC CE
・Serving Cell Set based SRS Spatial Relation Indication MAC CE
・SP Positioning SRS Activation/Deactivation MAC CE
・Guard Symbols MAC CE
・RLC AM ACK/NACK, RLC segement size control info
また、Inter-gNB CAに対応するため、新たなgNB(gNB-CU, gNB-DU)の追加、変更または解放手順(addition/modification/change/releaseの何れかによって表現されてよい)が規定されてもよい。或いは、既存のSNの追加、変更または解放手順(SN addition/modification/change/release procedure)を再利用し、Inter-gNB CAか否かを示す表示(indication)が含まれるようにしてもよい。
Inter-gNB CAがサポートされる場合、Inter-gNB CAを実行するUEと、同一セルと利用する他のUEとを対象としたULリソースのスケジューリングが必要となる。
上述した実施形態によれば、以下の作用効果が得られる。具体的には、本実施形態では、D2インターフェースを介してDUが直接接続されるため、D2インターフェースを介した迅速かつ効率的な処理が可能となる。
以上、実施形態について説明したが、当該実施形態の記載に限定されるものではなく、種々の変形及び改良が可能であることは、当業者には自明である。
無線フレームは時間領域において1つまたは複数のフレームによって構成されてもよい。時間領域において1つまたは複数の各フレームはサブフレームと呼ばれてもよい。サブフレームはさらに時間領域において1つまたは複数のスロットによって構成されてもよい。サブフレームは、ニューメロロジー(numerology)に依存しない固定の時間長(例えば、1ms)であってもよい。
20 NG-RAN
100 gNB
110 DU
111 無線通信部
113 DU制御部
115 IF接続部
120 CU
121 CU制御部
123 IF接続部
200 UE
210 無線通信部
220 MAC処理部
230 RRC処理部
240 制御部
1001 プロセッサ
1002 メモリ
1003 ストレージ
1004 通信装置
1005 入力装置
1006 出力装置
1007 バス
2001 車両
2002 駆動部
2003 操舵部
2004 アクセルペダル
2005 ブレーキペダル
2006 シフトレバー
2007 左右の前輪
2008 左右の後輪
2009 車軸
2010 電子制御部
2012 情報サービス部
2013 通信モジュール
2021 電流センサ
2022 回転数センサ
2023 空気圧センサ
2024 車速センサ
2025 加速度センサ
2026 ブレーキペダルセンサ
2027 シフトレバーセンサ
2028 物体検出センサ
2029 アクセルペダルセンサ
2030 運転支援システム部
2031 マイクロプロセッサ
2032 メモリ(ROM, RAM)
2033 通信ポート
Claims (6)
- 端末との無線通信部を備える第1装置と、
前記第1装置と接続される第2装置と
によって構成され、
前記第1装置は、
特定インターフェースを用いて他の無線基地局の第1装置と直接接続され、
前記端末との無線通信を制御する制御部と、
前記特定インターフェースを介して前記無線通信に関する情報を送信または受信する送受信部と
を備える無線基地局。 - 前記送受信部は、セカンダリーセルにおける前記端末との無線リンクの状態を示す情報を送信または受信する請求項1に記載の無線基地局。
- 前記送受信部は、セカンダリーセルにおける前記端末との下り制御チャネル、媒体アクセス制御レイヤの制御要素、及び無線リンク制御レイヤに関する情報の少なくとも何れかを送信または受信する請求項1に記載の無線基地局。
- 前記送受信部は、前記端末のスケジューリング優先度の決定に用いられるスケジューリング情報を送信または受信する請求項1に記載の無線基地局。
- 端末と無線基地局とを含む無線通信システムであって、
前記無線基地局は、
前記端末との無線通信部を備える第1装置と、
前記第1装置と接続される第2装置と
によって構成され、
前記第1装置は、
特定インターフェースを用いて他の無線基地局の第1装置と直接接続され、
前記端末との無線通信を制御する制御部と、
前記特定インターフェースを介して前記無線通信に関する情報を送信または受信する送受信部と
を備える無線通信システム。 - 端末との無線通信部を備える第1装置と、前記第1装置と接続される第2装置とによって構成される無線基地局による無線通信方法であって、
前記第1装置は、特定インターフェースを用いて他の無線基地局の第1装置と直接接続され、
前記第1装置が、前記端末との無線通信を制御するステップと、
前記第1装置が、前記特定インターフェースを介して前記無線通信に関する情報を送信または受信するステップと
を含む無線通信方法。
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"Initial Views on Release 18 NR", 3GPP TSG RAN MEETING #91-E, 3GPP, March 2021 (2021-03-01) |
3GPP: "3rd Generation Partnership Project; Technical Specification Group Radio Access Network", 3GPP TS 38.473 V15.15.0, October 2021 (2021-10-01) |
SAMSUNG: "Multi-RAT Multi-Connectivity (MR-MC) for 5G-Advanced", 3GPP DRAFT; RP-211798, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. TSG RAN, no. Electronic Meeting; 20210913 - 20210917, 6 September 2021 (2021-09-06), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052049119 * |
ZTE, SANECHIPS: "Discussion on introduction of the study on Inter- gNB Coordination", 3GPP DRAFT; RP-212403, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, no. Electronic meeting; 20210913 - 20210917, 6 September 2021 (2021-09-06), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP052050379 * |
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