WO2022208830A1 - 無線通信ノード、基地局、および、無線通信方法 - Google Patents
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- H—ELECTRICITY
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Definitions
- the present disclosure relates to wireless communication nodes, base stations, and wireless communication methods for setting up wireless access and wireless backhaul.
- 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
- the integrated access and backhaul integrates radio access to terminals (user equipment, UE) and radio backhaul between radio communication nodes such as radio base stations (gNBs).
- UE user equipment
- gNBs radio base stations
- IAB nodes are connected to Mobile Termination (MT), which is a function for connecting with upper nodes such as parent nodes and IAB donor CUs (Central Units), and lower nodes such as child nodes and UEs. It has a Distributed Unit (DU), which is a function for
- Radio access and radio backhaul are premised on half-duplex and time division multiplexing (TDM). Also, in Release 17, simultaneous operation of MT and DU (simultaneous Tx/Rx) is being considered, and application of frequency division multiplexing (FDM), space division multiplexing (SDM) and full-duplex communication (Full-duplex) is being studied (Non-Patent Document 1).
- FDM frequency division multiplexing
- SDM space division multiplexing
- Full-duplex communication Full-duplex
- guard band when performing FDM between MT and DU, in order to avoid interference between MT transmission/reception (Tx/Rx) and DU transmission/reception (Tx/Rx), the frequency that indicates the frequency band that is prohibited to use It is conceivable to set a usage prohibited range (so-called guard band).
- the guard band pattern for example, whether to use the DU NA resource as a guard band at the boundary between the DU Hard resource and the DU NA resource.
- An object of the present invention is to provide a wireless communication node and a wireless communication method that can prevent interference.
- connection unit upper node connection unit 170, lower node A wireless communication node (wireless communication node 100B).
- connection unit upper node connection unit 170, Lower node connection unit 180
- control unit 190 controls guard bands for radio resources for the parent node (parent node 100A) and for the lower node (child node 100C).
- wireless communication node 100B wireless communication node 100B.
- one aspect of the present disclosure is a step of connecting a parent node (parent node 100A) and a lower node (child node 100C) that can share radio resources by frequency division multiplexing; ) and a step of controlling guard bands for radio resources for a lower node (child node 100C).
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10.
- FIG. 2 is a diagram showing a basic configuration example of the IAB.
- FIG. 3A is a diagram showing DU resource types and control examples in FDM.
- FIG. 3B is a diagram showing DU resource types and control examples in FDM.
- FIG. 4 is a functional block diagram of the parent node 100A.
- FIG. 5 is a functional block configuration diagram of the IAB node 100B that configures the IAB node.
- FIG. 6 is a diagram showing an example of Case 1 (guard band at the boundary of adjacent DU H/NA frequency resources).
- FIG. 7 is a diagram illustrating an example of Case 2 (guard band at hard/soft INA resource boundary).
- FIG. 1 is an overall schematic configuration diagram of a radio communication system 10.
- FIG. 2 is a diagram showing a basic configuration example of the IAB.
- FIG. 3A is a diagram showing DU resource types and control examples in FDM.
- FIG. 3B is
- FIG. 8 is a diagram showing an example of Case 3 (soft IA/NA resource boundary guard band).
- FIG. 9 is a diagram showing an example of Case 4 (soft-IA/soft-INA resource boundary guard band).
- FIG. 10 is a diagram showing other embodiments (variations) of Case 1/2/3/4.
- FIG. 11 is a diagram illustrating operation example 2 in which a guard band is explicitly set.
- FIG. 12 is a diagram showing an example of the hardware configuration of CU50, wireless communication nodes 100A to 100C and UE200.
- 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) to 6G, and is composed of a plurality of radio communication nodes and terminals.
- NR 5G New Radio
- the wireless communication system 10 includes a central unit 50 (hereinafter referred to as CU50), wireless communication nodes (including parent node 100A, IAB node 100B, and lower node 100C), and user terminal 200 (hereinafter referred to as UE200). .
- CU50 central unit 50
- UE200 user terminal 200
- the wireless communication nodes 100A, 100B, and 100C can set up wireless access with the UE 200 and wireless backhaul (BH) between the wireless communication nodes. Specifically, backhauls (transmission paths) are established by wireless links between the parent node 100A and the IAB node 100B, and between the IAB node 100B and the lower node 100C.
- backhauls transmission paths
- IAB Integrated Access and Backhaul
- the IAB will reuse existing functions and interfaces defined for wireless access.
- Mobile-Termination MT
- gNB-DU Distributed Unit
- gNB-CU Central Unit
- UPF User Plane Function
- AMF Access and Mobility Management Function
- SMF Session Management Function
- NR Uu MT to gNB/DU
- F1, NG, X2 and N4 are used as baselines.
- the parent node 100A is connected to the NR radio access network (NG-RAN) and core network (Next Generation Core (NGC) or 5GC) via a wired transmission line such as fiber transport.
- NG-RAN/NGC includes a communication node, Central Unit 50 (CU50).
- CU50 Central Unit 50
- NG-RAN and NGC may be simply referred to as a "network”.
- the number of parent nodes 100A is not limited to the illustrated example.
- the parent nodes 100A-1 and 100A-2 are divided into a Master Cell Group (MCG), which is a group of cells formed by the master radio base station, and a Secondary Cell Group (SCG), which is a group of cells formed by the secondary radio base stations. can be classified.
- MCG Master Cell Group
- SCG Secondary Cell Group
- the IAB node 100B is connected to 5G (NR) to 6G radio access networks (NG-RAN) and core networks (NGC or 5GC) via wired transmission lines such as fiber transport.
- NG-RAN/NGC includes CU50, which is a communication node.
- the CU50 may be configured by any one or a combination of the UPF, AMF, and SMF described above.
- CU50 may be a gNB-CU as described above.
- CU50 may also specifically be referred to as IAB donor CU.
- FIG. 2 is a diagram showing a basic configuration example of the IAB.
- the wireless communication node 100A constitutes a parent node in the IAB
- the wireless communication node 100B constitutes an IAB node in the IAB
- the wireless communication node 100C Construct a child node in IAB.
- child node 100C is exemplified as being separate from UE 200, but lower nodes may include UE 200 as well as child nodes. Therefore, in the present embodiment, child node 100C may be read as UE200 and applied.
- the parent node may be called a higher node in relation to the IAB node. Therefore, in the present embodiment, the parent node may be read as an upper node and applied, or the upper node may be read as a parent node.
- the upper node may include the IAB donor CU 50 in addition to the parent node 100A.
- the IAB node 100B may be called a child node or a lower node in relation to the parent node 100A.
- the UE 200 may configure a child node as a child node or lower node in the IAB. Therefore, in the present embodiment, the child node may be read as a lower node and applied, and the lower node may be read as a child node and applied.
- IAB node 100B may be referred to as a parent node or upper node in relation to child node 100C, and child node 100C may be referred to as a child node or lower node in relation to IAB node 100B.
- a wireless link is set up between the parent node and the IAB node. Specifically, a wireless link called Link_parent is set.
- a wireless link is set between the IAB node and the child node. Specifically, a wireless link called Link_child is set.
- Link_parent is composed of a downlink DL Parent BH and an uplink UL Parent BH.
- Link_child is composed of a downlink DL Child BH and an uplink UL Child BH.
- a radio link established between the UE 200 and the IAB node or parent node is called a radio access link.
- the radio link is composed of a downlink DL Access and an uplink UL Access.
- Time Division Multiplexing TDM
- Frequency Division Multiplexing FDM
- Resource division techniques such as Space Division Multiplexing (SDM) are required.
- FDM frequency division multiplexing
- the IAB node has Mobile Termination (MT), which is a function for connecting with upper nodes such as parent nodes, and Distributed Unit (DU), which is a function for connecting with lower nodes such as child nodes or UE200.
- MT Mobile Termination
- DU Distributed Unit
- the parent node and child node also have MT and DU (see FIG. 1).
- the radio resources used by the DU include downlink (DL), uplink (UL) and flexible resources (D/U/F) from the DU perspective, and the radio resources are hard, soft, or Not Available ( H/S/NA). Also, available (available) or not available (NA: not available) is stipulated in the software (S).
- Flexible resource (F) is a resource that can be used for either DL or UL.
- “hardware” means that the corresponding radio resource is a radio resource that can always be used for a DU child link that is connected to a lower node such as a child node or UE, that is, the radio resource is dedicated to the lower node indicates that it is specified as
- “soft” is a radio resource whose availability for DU child link use of the corresponding radio resource is explicitly or implicitly controlled by a higher node such as a parent node or CU, that is, the radio Indicates that the resource is not designated as dedicated for lower nodes.
- a radio resource for a lower node set as soft may be referred to as a DU soft resource.
- any of DL-H, DL-S, UL-H, UL-S, F-H, F-S or NA is set as the DU resource.
- the IAB configuration example shown in FIG. 2 assumes CU/DU division
- the IAB configuration is not necessarily limited to such a configuration.
- the wireless backhaul may be configured with IAB by tunneling using GPRS Tunneling Protocol (GTP)-U/User Datagram Protocol (UDP)/Internet Protocol (IP).
- GTP GPRS Tunneling Protocol
- UDP User Datagram Protocol
- IP Internet Protocol
- IAB The main advantage of such an IAB is that NR cells can be arranged flexibly and densely without densifying the transport network. IAB can be applied to various scenarios such as outdoor small cell deployment, indoors, and even supporting mobile relays (eg, in buses and trains).
- the IAB may also support NR-only standalone (SA) deployments or non-standalone (NSA) deployments that include other RATs (such as LTE), as shown in Figures 1 and 2.
- SA NR-only standalone
- NSA non-standalone
- the radio access and radio backhaul can be half-duplex or full-duplex, such as simultaneous communication (Tx and/or Rx) in MT and DU. do not have.
- time division multiplexing TDM
- space division multiplexing SDM
- frequency division multiplexing FDM
- the DL Parent BH is the receiving (RX) side
- the UL Parent BH is the transmitting (TX) side
- the DL Child BH is the transmitting (TX) side
- UL Child BH is the receiving (RX) side.
- the DL/UL setting pattern at the IAB node is not limited to DL-F-UL, and there are setting patterns such as wireless backhaul (BH) only and UL-F-DL. may be applied.
- FIG. 3 is a diagram showing DU resource types and control examples in FDM.
- the gray part of the diagram indicates that the DU cannot use the resource for transmission/reception
- the black part indicates that the DU can use the resource for transmission/reception
- the white part indicates that the DU can use the resource. Indicates availability when displayed dynamically.
- each DU serving cell can configure hard, soft, NA type per frequency resource (in addition to resource type configuration for time resources in Release 16).
- T-F time-frequency
- each DU serving cell can configure each time-frequency (T-F) resource as hard, soft, NA type.
- T-F time-frequency
- Option 2 does not require H/S/NA DU resource configuration for Release-16 DU symbols. Whether a DU can use time-frequency resources is determined directly from this Option 2 configuration.
- This setting may be provided from the CU to the IAB node via F1-AP or RRC signaling.
- “hard” means that DUs can transmit and receive (Tx/Rx) to the resource
- “soft” means that the resource is explicitly or implicitly means that the DU can transmit and receive (Tx/Rx) to the resource when dynamically indicated as available
- 'NA' means that the DU can transmit and receive (Tx/Rx) to the resource Rx) may mean that it cannot execute.
- the time units are different, different H/S/NA resource types may be configured for frequency resources.
- the time unit is, for example, the multi-subframe/subframe/multi-slot/slot/symbol/symbolgroup/DUF resource type of each slot.
- radio resources are controlled by an appropriate method as detailed below. That is, in FDM, in order to prevent interference, the DU serving cell, in the present embodiment, so that an appropriate guard band is set between the MT resource and the DU resource in the frequency direction, the IAB node can accurately set the DU resource.
- FIG. 4 is a functional block diagram of the parent node 100A. As shown in FIG. 4, the parent node 100A includes a radio transmission section 110, a radio reception section 120, a NW IF section 130, an IAB node connection section 140 and a control section 150.
- the wireless transmission unit 110 transmits wireless signals according to 5G to 6G specifications. Also, the radio receiving unit 120 transmits radio signals according to the specifications of 5G to 6G. In this embodiment, the wireless transmitter 110 and the wireless receiver 120 perform wireless communication with the IAB node 100B.
- the parent node 100A has the functions of MT and DU, and the radio transmission section 110 and the radio reception section 120 also transmit and receive radio signals corresponding to MT/DU.
- the radio transmission unit 110 can transmit configuration information, etc. regarding availability of radio resources in the IAB node 100B for parent nodes and/or for lower nodes to the IAB node 100B. More specifically, the radio transmission unit 110 may transmit configuration information and the like regarding availability of radio resources on the MT side/DU side in the IAB node 100B to the IAB node 100B. Specific examples of configuration information include "hard (H)” that specifies that the radio resource is used exclusively for the lower node (DU), and "soft (S)” that indicates that the radio resource is not exclusively used for the lower node. ”, or “NA (Not Available)” information (H/S/NA) indicating that radio resources are not available for lower nodes.
- the configuration information indicates available or not available for lower nodes, which can be specified when radio resources are not specified exclusively for lower nodes (in the case of soft (S)). It may be specified information.
- the configuration information may be information called dynamic indication or availability indicator (AI).
- AI dynamic indication or availability indicator
- information further specifying the available flexible for any of uplink (UL), downlink (DL), DL or UL in lower node (DU) communication in the IAB node 100B (UL/DL/F) may be included.
- the setting information includes not only explicitly indicated information but also implicitly indicated information.
- the wireless resource may be controlled to be used for lower nodes.
- the NW IF unit 130 provides a communication interface that realizes connection with the NGC side such as the CU50.
- the NW IF unit 130 may include interfaces such as X2, Xn, N2, N3.
- the IAB node connection unit 140 provides an interface etc. for realizing connection with the IAB node (or it may be a child node including the UE). Specifically, the IAB node connection unit 140 provides a Distributed Unit (DU) function. In other words, the IAB node connection unit 140 is used for connection with the IAB node (or child node).
- DU Distributed Unit
- the IAB node may also be expressed as a RAN node that supports radio access to the UE 200 and backhauls access traffic by radio.
- a parent node or IAB donor may also be referred to as a RAN node that provides the UE's interface to the core network and radio backhaul functionality to the IAB node.
- the control unit 150 controls each functional block that constitutes the parent node 100A.
- the control unit 150 may control the DU soft resource of the IAB node 100B through transmission of configuration information such as dynamic indication and availability indicator (AI).
- AI dynamic indication and availability indicator
- the control unit 150 may perform implicit display by not transmitting the setting information. For example, setting information indicating that the DU resource is soft is sent from the CU 50 to the IAB node 100B, but the parent node 100A belonging to the MCG or the like does not send explicit setting information about the DU soft resource. , may perform an implicit display. That is, the lack of explicit indication from the network of available radio resources for both DU and MT can be configuration information indicating an implicit indication.
- the control unit 150 may have a semi-static setting indicating whether the DU soft resource of the IAB node can be used in any of DL/UL/F.
- Semi-static settings may mean that the settings do not change dynamically, but may be updated or changed based on indications from the network.
- the control unit 150 may acquire the resource setting information of the child node (IAB node 100B) received from the CU 50 via the NW IF unit 130.
- the control unit 150 may acquire setting information (for example, H/S/NA types of DU resources of the child node, etc.) regarding the resource setting of the child node (that is, the IAB node 100B) seen from itself.
- the control unit 150 can dynamically control the DU soft resource.
- FIG. 5 is a functional block configuration diagram of the IAB node 100B that configures the IAB node. As shown in FIG. 5, the IAB node 100B includes a radio transmission section 161, a radio reception section 162, an upper node connection section 170, a lower node connection section 180 and a control section 190. FIG.
- the IAB node 100B has functional blocks similar to those of the parent node 100A described above, but differs in that it includes an upper node connection unit 170 and a lower node connection unit 180, and the function of the control unit 190.
- the wireless transmission unit 161 transmits wireless signals according to 5G to 6G specifications. Also, the radio receiving unit 162 receives radio signals conforming to the specifications of 5G to 6G. In this embodiment, the radio transmission unit 161 and the radio reception unit 162 perform radio communication with higher nodes such as the parent node 100A and radio communication with lower nodes such as child nodes (including the case of the UE 200). For example, the radio receiving unit 162 receives at least configuration information and the like regarding radio resources (DU resources) for lower nodes from the network such as the parent node 100A. For example, the radio receiver 162 may receive configuration information or the like regarding availability of frequency resources in the IAB node 100B for parent nodes and/or lower nodes.
- DU resources radio resources
- the upper node connection unit 170 provides an interface for realizing connection with nodes higher than the IAB node.
- the upper node may be a wireless communication node located closer to the network, more specifically, to the core network side (which may also be referred to as the upstream side or upstream side) than the IAB node.
- the upper node connection unit 170 provides a Mobile Termination (MT) function.
- MT Mobile Termination
- the upper node connection unit 170 is used for connection with the parent node 100A constituting the upper node in this embodiment.
- the upper node connection unit 170 may be connected to the core network side such as the CU50 via a wired transmission line or the like, not limited to wireless communication.
- the control unit 190 may receive, from the CU 50 via the upper node connection unit 170, configuration information regarding availability of radio resources in the IAB node 100B for parent nodes and/or lower nodes. Note that this is not the only option, and the wireless reception unit 120 may acquire setting information and the like from the CU 50 through wireless communication.
- the lower node connection unit 180 provides an interface for realizing connection with nodes lower than the IAB node.
- a lower node means a wireless communication node located on the end-user side (which may also be referred to as the downstream side or downstream side) from the IAB node.
- the lower node connection unit 180 provides a Distributed Unit (DU) function. That is, in this embodiment, the lower node connection unit 180 is used for connection with a child node (which may be the UE 200) that constitutes a lower node.
- DU Distributed Unit
- upper node connection section 170 is used for connection with parent node 100A
- lower node connection section 180 is used for connection with lower nodes (child node 100C, etc.)
- these upper node connections (MT connection) and lower node connection (DU connection) may share radio resources.
- the control unit 190 controls each functional block that configures the IAB node 100B.
- the control unit 190 executes control regarding radio resources.
- radio resources in the IAB node 100B can be used for both MT and DU. Furthermore, MT can be connected to the parent node 100A. Therefore, the control unit 190 controls radio resources that can be shared by the parent node and the lower nodes.
- control unit 190 controls radio resources for the parent node (MT side) and/or lower nodes (DU side) based on the setting information received from the CU 50 or the parent node 100A. .
- control section 190 controls guard bands.
- the control unit 190 is based on setting information or the like that is explicitly displayed from the network (including parent nodes, CUs, etc.), or based on implicit information that is suggested from the setting information, usage conditions, or the like. may be used to determine the guard band. A specific example of the implicit or explicit guard band determination method will be described later.
- Control channels include control channels and data channels.
- Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), and PBCH (Physical Broadcast Channel).
- data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).
- PDSCH Physical Downlink Shared Channel
- PUSCH Physical Uplink Shared Channel
- Reference signals include demodulation reference signal (DMRS), sounding reference signal (SRS), phase tracking reference signal (PTRS), and channel state information-reference signal (CSI-RS). and a reference signal.
- Data may also refer to data transmitted over a data channel.
- UCI is control information that is the target of Downlink Control Information (DCI) and is transmitted via PUCCH or PUSCH.
- DCI Downlink Control Information
- UCI may include SR (Scheduling Request), HARQ (Hybrid Automatic repeat request) ACK/NACK, and CQI (Channel Quality Indicator).
- the control unit 190 may control radio resources, including guard band settings, based on the availability of radio resources indicated by the setting information. Specifically, in addition to the H/S/NA information indicated by the setting information, control unit 190 sets IA (Indicated as Available) or INA (Indicated as not Available) when the target resource is soft (S). ), the availability of DU resources can be determined. Note that "IA” means that DU resources are explicitly or implicitly indicated as available. Also, "INA" means that the DU resource is explicitly or implicitly marked as unavailable. As setting information, in addition to dynamic indication, the control unit 190 may control DU resources (frequency resources and/or time resources, etc.) based on setting information such as availability indicator (AI). good.
- AI availability indicator
- the control unit 190 controls setting information (for example, dynamic for the parent node (MT side) and/or for the lower node (DU side) may control radio resources.
- control unit 190 may grasp the usage status of the radio resource for the parent node (MT side) via the upper node connection unit 170, and the radio resource for the lower node (MT side) via the lower node connection unit 180. DU side) usage status may be grasped. Then, the control unit 190 may control radio resources based on the usage status of radio resources for the parent node and/or the lower nodes, in addition to the setting information.
- the control unit 190 may control radio resources as follows. That is, for example, when a radio resource is specified as dedicated (Hard) for a lower node in all setting information, the control unit 190 may control such that the radio resource is used for the lower node. In addition, when at least one item of setting information indicates that a radio resource is not available for a lower node (Not Available), the control unit 190 may perform control so that the radio resource is not used for a lower node. .
- the control unit 190 determines whether the wireless resource is available for the lower node. You may control so that it is used as a destination. Further, when a plurality of pieces of setting information are received and the radio resource is not used for the upper node, the control unit 190 may control the radio resource to be used for the lower node. good.
- control unit 190 can appropriately control allocation of MT/DU radio resources. Some or all of the conditions described above may be implemented by arbitrarily combining them.
- Option 0 IAB node assumes that IAB DU and IAB MT resources are not adjacent Option 1 Treat "x" Subcarriers/RBs/RBGs of IAB DU resources and adjacent IAB MT resources as guard bands Option 2 "x" Subcarriers/RBs/RBGs of IAB MT resources and adjacent IAB DU resources are treated as guard bands Option x-1 Only when DU and MT transmit and receive simultaneously Option x-2 Always Option 1/2 supported at the same time is also assumed
- Option 1 Report from IAB node to Parent node
- Option 2 Reporting from IAB Node to IAB Donor CU
- Option 3 Report as Capability of IAB node
- Parent node notifies/sets to IAB node
- IAB donor CU notifies/sets
- Option 6 specifies a fixed value
- Option 7 IAB node DU implementation Not specified in Option 7-1
- Option 7-2 Defines the behavior of IAB nodes Depends on the implementation of the Option 8 Parent node Option 8-1 Not specified in specification
- Option 8-2 Defines the behavior of IAB nodes
- DU cannot transmit/receive (Tx/Rx)
- MT cannot transmit/receive (Tx/Rx)
- IAB node cannot communicate with MT transmission/reception (Tx/Rx) for the frequency resource determined as the guard band. Do not expect concurrent traffic to be set/displayed.
- X is the size of the guard band.
- Case 1 Case 1 (guard band at the boundary of adjacent DU H/NA frequency resources) will be described.
- FIG. 6 is a diagram showing an example of Case 1 (guard band at the boundary of adjacent DU H/NA frequency resources). In Case 1, the following options may be adopted.
- the IAB node does not assume that DU hard and DU NA frequency resources are configured adjacently at the subcarrier/RB/RBG level.
- Option 1 uses the X subcarriers/RB/RBG in the NA resource adjacent to the hard resource as a 'guard band'.
- MT cannot transmit/receive (Tx/Rx) on NA frequency resources determined as guard bands on symbols/slots, or the IAB node does not assume that MT transmit/receive (Tx/Rx) is configured/specified.
- the following options may be adopted.
- Option 1-1 Only applies if there is DU simultaneous transmission/reception (Tx/Rx) on adjacent hard frequency resources (subcarriers/RB/RBG) for that symbol/slot.
- Option 1-2 Always applies with or without concurrent operation.
- Option 2 uses the X subcarriers/RB/RBG in the hard resource adjacent to the NA resource as a 'guard band'.
- the DU cannot perform transmission/reception (Tx/Rx) on resources determined as guard bands, even if the resources are configured as hard.
- Tx/Rx transmission/reception
- Option 2-1 Applies only if MT simultaneous transmission/reception (Tx/Rx) exists on adjacent NA frequency resources (subcarriers/RB/RBG) on that symbol/slot.
- Option 2- always applies.
- FIG. 7 is a diagram illustrating an example of Case 2 (guard band at hard/soft INA resource boundary).
- IAB nodes do not assume that hard and soft INA resources are configured contiguously at the subcarrier/RB/RBG level. For example, it is not assumed that X subcarriers/RB/RBG in soft resources adjacent to hard resources are set to 'INA'. Alternatively, the X subcarrier RB/RB in the soft resource adjacent to the hard resource is always set as 'IA'.
- Option 1 uses the X subcarriers/RB/RBG in the soft INA resource adjacent to the hard resource as a 'guard band'.
- the soft INA frequency resource determined as a guard band on the symbol/slot either the MT cannot transmit/receive (Tx/Rx) or the IAB node assumes that the MT transmit/receive (Tx/Rx) is configured/indicated. do not do.
- the following options may apply to this behavior.
- Option 1-1 Only applies if there is simultaneous DU transmission/reception (Tx/Rx) on adjacent hard frequency resources (subcarriers/RB/RBG) for that symbol/slot.
- Option 1-2 Always applies.
- Option 2 uses the X subcarriers/RB/RBG in the hard resource adjacent to the soft INA resource as a 'guard band'.
- the DU cannot perform transmission/reception (Tx/Rx) on resources determined as guard bands, even if the resources are configured as hard.
- Tx/Rx transmission/reception
- the following options may be adopted.
- Option 2-1 Applies only if there is MT simultaneous transmission and reception (Tx/Rx) on adjacent soft INA frequency resources (subcarriers/RB/RBG) on that symbol/slot.
- Option 2-2 Always applies.
- Case 3 The operation of Case 3 (soft IA/NA resource boundary guard band) will be described.
- FIG. 8 is a diagram showing an example of Case 3 (guard band of soft IA/NA resource boundary).
- IAB nodes do not assume that NA and soft IA resources are configured adjacently at the subcarrier/RB/RBG level. For example, it is not assumed that X subcarriers/RB/RBG in soft resources adjacent to NA resources are set to "IA". Alternatively, expect X subcarriers/RB/RBG in soft resources adjacent to NA resources to always be set to 'INA'.
- option 1 uses the X subcarriers/RB/RBG in the NA resource adjacent to the hard resource as a 'guard band'. In this case, either the MT cannot configure Tx/Rx on the resources determined as guard bands on the symbols/slots, or the IAB node does not expect MT transmit/receive (Tx/Rx) to be configured/indicated on the NA frequency. .
- the following operating options may be employed.
- Option 1-1 Applies only if there is simultaneous DU transmission/reception (Tx/Rx) on adjacent soft IA frequency resources (subcarriers/RB/RBG) for that symbol/slot.
- Option 1-2 Always applies.
- option 2 uses the X subcarriers/RB/RBG in the soft IA resource adjacent to the NA resource as a 'guard band'.
- the DU cannot perform transmission/reception (Tx/Rx) on resources determined as guard bands, even if the resources are indicated as soft IA.
- Tx/Rx transmission/reception
- the following action options may apply.
- Option 2-1 Applies only if MT simultaneous transmission/reception (Tx/Rx) exists on adjacent NA frequency resources (subcarriers/RB/RBG) on that symbol/slot.
- Option 2-2 Always applies.
- Case 4 Case 4 (guard band of soft-IA/soft-INA resource boundary) will be explained.
- FIG. 9 is a diagram showing an example of Case 4 (soft-IA/soft-INA resource boundary guard band).
- Option 1 uses the X subcarriers/RB/RBG in the soft INA resource adjacent to the soft IA resource as a 'guard band'.
- the MT cannot transmit/receive (Tx/Rx) on the soft INA frequency resources determined as guard bands on that symbol/slot, or the IAB node indicates that MT transmit/receive (Tx/Rx) is configured/indicated. don't assume.
- the following options for this operation may be adopted.
- Option 1-1 Only applies if there is simultaneous DU transmission/reception (Tx/Rx) on adjacent soft IA frequency resources (subcarrier/RB/RBG) for that symbol/slot.
- Option 1-2 Always applies.
- option 2 uses the X subcarriers/RB/RBG in the soft IA resource adjacent to the soft INA resource as a 'guard band'.
- the DU cannot perform transmission/reception (Tx/Rx) on resources determined as guard bands, even if the resources are indicated as soft IA.
- Tx/Rx transmission/reception
- the following operating options may be employed.
- Option 2-1 Applies only if there are MT simultaneous transmissions (Tx/Rx) on adjacent soft INA frequency resources (subcarriers/RB/RBG) on that symbol/slot.
- Option 2-2 Always applies.
- FIG. 10 is a diagram showing other embodiments (variations) of Case 1/2/3/4. As shown in Figure 10, both option 1 and option 2 may be supported. In this case, X described above may be replaced with X1 and X2. Also, X1 and X2 may be X/2 or [X/2] or [X/2].
- Option 1 Reported from IAB node to parent node
- Option 2 Reported from IAB node to IAB donor CU
- Option 3 Reported as IAB node function
- Option 4 Set/displayed from parent node to IAB node (in this case, IAB node can report the desired size of the guardband to the parent node.)
- Option 5 Setting/indication from IAB donor CU to IAB node (In this case, the IAB node's guardband also needs to be communicated to its parent node.
- Option 6 Predefined and/or fixed value
- Option 7 Depending on IAB node DU implementation
- Option 7-1 No impact of additional specifications
- Option 7-2 IAB node behavior is specified.
- a DU shall perform simultaneous MT transmission/reception (Tx/Rx) of adjacent DU soft INA/NA frequency resources Frequency resource transmission/reception (Tx/Rx) can only be performed if it does not affect the Alternatively, simultaneous MT transmission/reception (Tx/Rx) on adjacent DU soft INA/NA frequency resources is unchanged by DU transmission/reception (Tx/Rx). Otherwise, the DU cannot transmit or receive (Tx/Rx) on these frequencies (ie guard bands).
- Option 8 Depends on parent node implementation of setting/indication of MT transmission/reception (Tx/Rx)
- Option 8-1 No impact of additional specifications
- Option 8-2 IAB node behavior is specified.
- MT can only perform Tx/Rx of frequency resources (IAB node expects to set/indicate MT Tx/Rx) only if there is none.
- Tx/Rx simultaneous DU transmit/receive
- reporting of the above options may be sent and received via RRC/MAC CE/Layer 1 Signaling (UCI).
- setting/indication of the above options may be transmitted/received via RRC/MAC CE/Layer 1 signaling (DCI).
- the unit (granularity) of the guard band can be subcarrier/N subcarrier (subcarrier group)/RB/N RB (RB group).
- the guard band size may be reported/displayed/configured as the number of subcarriers/subcarrier groups/RBs/RB groups.
- different guard bands may be reported/indicated/configured for different combinations of MT-Tx/Rx and DU-Tx/Rx.
- FIG. 11 is a diagram illustrating operation example 2 in which a guard band is explicitly set.
- configuration/indication can be sent from the IAB donor CU/parent node via RRC/MAC CE/DCI.
- the IAB node's guardband pattern is also communicated to its parent node.
- the following options may be adopted.
- Option 1 The guard bands are configured with the same signaling as the hard/soft/NA DU frequency resource type configuration (see the IAB's semi-static resource configuration example in FDM above in Figure 3).
- it may be reused as a 'resource type' that is considered a 'guard band'.
- frequency resources for which hard/soft/NA resource types are not set may be set as "guard bands.”
- guard bands are set/indicated with signaling independent of the hard/soft/NA DU frequency resource type configuration.
- guardbands can be set/displayed as follows:
- Option 2-1 Multiple contiguous subcarriers/RB/RBG are configured/displayed. The starting subcarrier/subcarrier group/RB/RB group and the number of consecutive subcarriers/subcarrier groups/RB/RB groups are set/displayed.
- Option 2-2 A bitmap corresponding to subcarriers/subcarrier groups/RBs/RB groups within the DU transmission bandwidth is constructed/displayed.
- a DU cannot transmit or receive (Tx/Rx) on frequency resources that are configured as 'guard bands'. Either the MT cannot perform send/receive (Tx/Rx) or the IAB node does not expect composition/indication by MT send/receive (Tx/Rx).
- the "soft IA” may indicate that it is explicitly indicated that it can be used or that it is implicitly indicated that it can be used. be.
- Soft-INA may refer to explicit non-availability, implied non-availability, and/or no explicit indication.
- guard band configuration/display/reporting can be performed for each DU cell/MT serving cell/ ⁇ DU cell, MT serving cell ⁇ pair.
- one or more or all of the following MT Tx/Rx and DU Tx/Rx combinations may require a guard band.
- the sizes of the guard bands are different in the following combinations.
- guardbands are applied only to necessary combinations.
- inter-carrier MT and DU concurrent operation i.e. MT Tx/Rx and DU Tx/Rx on MT serving cell and also on DU cells with non-overlapping frequency bands can be applied. It can be reused in MT serving cell frequency resources which are considered as 'DU NA' resource type and DU cell frequency resources which are considered as 'DU HARD' resource type.
- the maximum number of guard bands in slots/N slots/symbols/N symbols (e.g. M) is fixed and/or predefined and/or as an IAB node function May be defined and reported and/or set by higher layer signaling. That is, the IAB node does not assume more than M guardbands in slots/N slots/symbols/N symbols.
- the maximum number per DU cell/maximum number per MT serving cell/maximum number per pair of ⁇ DU cell, MT serving cell ⁇ may be provided.
- the maximum number of subcarriers/RBs/RBGs/slots/N slots/symbols/maximum number of guard bands in N symbols to be configured/displayed/determined (eg, M ) may be defined and/or reported as fixed and predefined and/or IAB node capabilities and/or configured by higher layer signaling. That is, the IAB node assumes that the number of subcarriers/RBs/RBGs set/indicated/determined as guard bands in slots/N slots/symbols/N symbols is M or less.
- the maximum number per DU cell/maximum number per MT serving cell/maximum number per ⁇ DU cell, MT serving cell ⁇ pair may be provided.
- IAB node functions and/or higher layer configuration Whether FDM is supported Whether FDM is supported for each combination of MT Tx/RX and DU Tx/Rx: whether or not MT Tx/DU Tx (MT Tx/DU Tx); MT Tx/DU Rx (MT Tx/DU Rx); MT Rx/DU Tx (MT Rx/DU Tx); MT Rx/DU Rx (MT Rx/DU Rx) • Whether a guard band is required and whether the size of the guard band is required.
- MT Tx/RX and DU Tx/Rx combinations MT Tx/DU Tx (MT Tx/DU Tx); MT Tx/DU Rx (MT Tx/DU Rx); MT Rx/DU Tx (MT Rx/DU Tx); MT Rx/DU Rx (MT Rx/DU Rx)
- MT Tx/DU Tx MT Tx/DU Tx
- MT Rx/DU Rx MT Rx/DU Rx
- Guardband may not be needed for some of the above combinations, so the ability is not needed for that combination.
- Maximum number of guard bands configured/displayed/determined within a slot/N slots/symbol/N symbols ⁇ Subcarriers set/displayed/determined as guard bands within a slot//N slots/symbol/N symbols/ Maximum Number of RBs/RBGs
- the above function can be performed per DU cell/MT serving cell/pair ⁇ DU cell, MT serving cell ⁇ . Also, the above embodiments only apply if the corresponding IAB node capabilities are supported and/or configured by the corresponding higher layer parameters.
- the IAB node 100B or the base station according to the present embodiment is used for connection to a parent node (parent node 100A) and a lower node (child node 100C) that can share radio resources by frequency division multiplexing.
- Connection unit upper node connection unit 170, lower node connection unit 180
- control unit control unit 190
- FDM frequency division multiplexing
- IAB Integrated Access and Backhaul
- control section 190 sets guard bands based on the state of radio resources (DU H/S/NA, etc. and semi-static resource configuration).
- the present embodiment can determine the situation (that is, read the implicit suggestion) and appropriately set the guard band. can be done.
- control unit 190 controls the guard band based on the setting information received from the central device 50, the parent node 100A, or the network.
- radio resources for the parent node (MT side) and/or lower nodes (DU side) may be controlled based on the usage status of the radio resources for the parent node. good. For example, even if there is no explicit indication of the DU soft resources from the upper node, resources can be appropriately controlled by considering the MT-side usage of the radio resources that can be shared. More specifically, when the target resource is in use on the MT side, the resource is not used for DU, and when the target resource is not in use on the MT side, the resource is provided for DU use. resources can be controlled.
- radio resource is not designated as exclusive for lower nodes (for example, Hard) (for example, in the case of DU soft resources)
- setting information regarding the availability of radio resources for lower nodes for example, Available or NA (Not Available) etc.
- MT side parent node
- DU side Controls radio resources for lower nodes
- the radio resource is used for the lower node.
- the radio resource can be controlled as follows.
- the radio resource is used for the lower node. and/or based on configuration information received from a parent node that does not specify that the radio resource is dedicated to the lower node (e.g., Hard) among a plurality of configuration information, the radio resource is used by the lower node. Since control is performed as to whether or not the resource is used as a destination, the resource can be managed accurately even when there are multiple pieces of setting information.
- the radio resource when a plurality of pieces of setting information are received and at least one piece of setting information indicates that the radio resource can be used for a lower node, and/or the radio resource is not used for the upper node, the radio resource is controlled to be used for the lower node, and appropriate resource management is performed according to multiple setting information and/or the MT usage status of the resource. be able to.
- the names of the parent node, the IAB node, and the child node were used, but the radio communication in which the radio backhaul between radio communication nodes such as gNB and the radio access with the terminal are integrated.
- the names may be different as long as the node configuration is adopted. For example, they may simply be called first and second nodes, or they may be called upper nodes, lower nodes, relay nodes, intermediate nodes, and the like.
- the wireless communication node may be simply referred to as a communication device or a communication node, or may be read as a wireless base station.
- DL and UL downlink
- forward ring reverse link
- access link and backhaul
- backhaul may be interchanged or associated.
- first link, second link, first direction, second direction, etc. may simply be used.
- 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. 12 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 12, the device may be configured as a computing device including processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, 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 FIGS. 3 and 4) 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 5th generation mobile communication system
- 5G Future Radio Access
- FAA New Radio
- NR New Radio
- W-CDMA® GSM®
- CDMA2000 Code Division Multiple Access 2000
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi®
- IEEE 802.16 WiMAX®
- IEEE 802.20 Ultra-WideBand (UWB), Bluetooth®
- next-generation systems enhanced based on these may be applied to one.
- 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.
- radio resources may be represented by an index.
- 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 mobile station in the present disclosure may be read as a base station.
- the base station may have the functions that the mobile station has.
- 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.”
- Radio communication system 50 CU 100A parent node 100B IAB node 100C child node 110 radio transmission unit 120 radio reception unit 130 NW IF unit 140 IAB node connection unit 150 control unit 161 radio transmission unit 162 radio reception unit 170 upper node connection unit 180 lower node connection unit 190 control unit 200UE 1001 Processor 1002 Memory 1003 Storage 1004 Communication Device 1005 Input Device 1006 Output Device 1007 Bus
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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)乃至6Gに従った無線通信システムであり、複数の無線通信ノード及び端末によって構成される。
次に、無線通信システム10を構成する親ノード100A及びIABノード100Bの機能ブロック構成について説明する。なお、説明が重複するので明記しないが、子ノード100Cも、IABノード100Bと同様の構成を備えていてもよい。
図4は、親ノード100Aの機能ブロック構成図である。図4に示すように、親ノード100Aは、無線送信部110、無線受信部120、NW IF部130、IABノード接続部140及び制御部150を備える。
図5は、IABノードを構成するIABノード100Bの機能ブロック構成図である。図5に示すように、IABノード100Bは、無線送信部161、無線受信部162、上位ノード接続部170、下位ノード接続部180及び制御部190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、FDMを用いてMT/DUの同時動作を実現する場合において、IABノードにおけるガードバンドの設定を含む無線リソースを制御する動作について説明する。
上述したように、FDMにてMT/DUの同時動作(MT Tx/DU Tx(MT送信/DU送信)、MT Tx/DU Rx(MT送信/DU受信)、MT Rx/DU Tx(MT受信/DU送信)、MT Rx/DU Rx(MT受信/DU受信)などの送受信)を実現する場合においては、干渉が発生しやすいため、ガードバンドの設定を含む適切な手法で無線リソースの制御を行う必要がある。そのため、以下の実施の形態において、ガードバンドの設定を含む無線リソースの各種制御手法について説明する。
まず、ガードバンドが暗黙的に設定される動作例1について説明する。具体的には、以下のケースおよびオプションについて説明する。なお、以下に説明する各ケースや各オプションの手法は任意に組み合わせて実施してもよいものである。
Case 1 DU H/NAリソース間のガードバンド
Case 2 DU H/S-INA リソース間のガードバンド
Case 3 DU S-IA/NA リソース間のガードバンド
Case 4 DU S-IA/S INA リソース間のガードバンド
Option 1 IAB DUリソースと隣接するIAB MTリソースの"x" Subcarrier/RBs/RBGsはガードバンドとして扱う
Option 2 IAB MTリソースと隣接するIAB DU リソース の "x" Subcarrier/RBs/RBGs はガードバンドとして扱う
Option x-1 DUとMTが同時送受信する場合のみ
Option x-2 常時
Option 1/2同時にサポートする場合も想定される
Option 1 IAB ノードからParentノードに報告する
Option 2 IABノードからIABドナーCUに報告する
Option 3 IABノードのCapability(能力情報)として報告する
Option 4 ParentノードがIABノードに通知/設定する
Option 5 IABドナーCUがIABノードに通知/設定する
Option 6 固定値を規定する
Option 7 IABノードDUの実装に依存する
Option 7-1 仕様で規定しない
Option 7-2 IABノードの動作を規定する
Option 8 Parentノードの実装に依存する
Option 8-1 仕様で規定しない
Option 8-2 IABノードの動作を規定する
Case 1(隣接DU H/NA周波数リソースの境界でのガードバンド)について説明する。図6は、Case 1(隣接DU H/NA周波数リソースの境界でのガードバンド)の例を示す図である。Case 1において、以下のオプションを採用してもよい。
オプション1-1 そのシンボル/スロットの隣接ハード周波数リソース(サブキャリア/RB/RBG)に、DU同時送受信(Tx/Rx)がある場合にのみ適用される。
オプション1-2 同時動作の有無にかかわらず、常に適用される。
オプション2-1 そのシンボル/スロット上の隣接NA周波数リソース(サブキャリア/RB/RBG)にMT同時送受信(Tx/Rx)が存在する場合にのみ適用される。
オプション2- 常に適用される。
Case2(ハード/ソフトINAリソース境界のガードバンド)について説明する。図7は、Case2(ハード/ソフトINAリソース境界のガードバンド)の例を示す図である。
オプション1-1 そのシンボル/スロットの隣接ハード周波数リソース(サブキャリア/RB/RBG)に、同時DU送受信(Tx/Rx)がある場合にのみ適用される。
オプション1-2 常に適用される。
オプション2-1 そのシンボル/スロット上の隣接ソフトINA周波数リソース(サブキャリア/RB/RBG)に、MT同時送受信(Tx/Rx)が存在する場合にのみ適用される。
オプション2-2 常に適用される。
Case 3(ソフトIA/NAリソース境界のガードバンド)の動作について説明する。図8は、Case 3(ソフトIA/NAリソース境界のガードバンド)の例を示す図である。
オプション1-1 そのシンボル/スロットの隣接ソフトIA周波数リソース(サブキャリア/RB/RBG)に、同時DU送受信(Tx/Rx)がある場合にのみ適用される。
オプション1-2 常に適用される。
オプション2-1 そのシンボル/スロット上の隣接NA周波数リソース(サブキャリア/RB/RBG)にMT同時送受信(Tx/Rx)が存在する場合にのみ適用される。
オプション2-2 常に適用される。
Case 4(soft-IA/soft-INAリソース境界のガードバンド)について説明する。図9は、Case 4(soft-IA/soft-INAリソース境界のガードバンド)の例を示す図である。
オプション1-1 そのシンボル/スロットの隣接ソフトIA周波数リソース(サブキャリア/RB/RBG)に、同時DU送受信(Tx/Rx)がある場合にのみ適用される。
オプション1-2 常に適用される。
オプション2-1 そのシンボル/スロット上の隣接ソフトINA周波数リソース(サブキャリア/RB/RBG)に、MT同時送信(Tx/Rx)が存在する場合にのみ適用される。
オプション2-2 常に適用される。
ガードバンドのサイズを決定するために、次のオプションを採用してもよい。
オプション1: IABノードから親ノードへ報告
オプション2: IABノードからIABドナーCUに報告される
オプション3: IABノード機能として報告
オプション4: 親ノードからIABノードへの設定/表示 (この場合、IABノードは親ノードにガードバンドの所望のサイズを報告することができる。)
オプション5: IABドナーCUからIABノードへの設定/表示 (この場合、IABノードのガードバンドもその親ノードに通知する必要がある。なお、IABノードは、所望のサイズのガードバンドをIABドナーCUに報告することができる。)
オプション6: 予め定義されるおよび/または固定値
オプション7: IABノードDU実装による
オプション7-1: 追加の仕様の影響なし
オプション7-2: IABノードの動作が指定される。(Release 16のソフトリソース可用性の暗黙的な決定の定義と同様) ハード/ソフト/IAのDU周波数リソースの場合、DUは、隣接するDUソフトINA/NA周波数リソースの同時MT送受信(Tx/Rx)に影響を与えない場合にのみ、周波数リソースの送受信(Tx/Rx)のみを実行できる。または、隣接するDUソフトINA/NA周波数リソース上の同時MT送受信(Tx/Rx)は、DU送受信(Tx/Rx)によって変化しない。そうでない場合は、DUはこれらの周波数(すなわちガードバンド)で送受信(Tx/Rx)できない。
オプション8: MT送受信(Tx/Rx)の設定/表示の親ノードの実装による
オプション8-1: 追加の仕様の影響なし
オプション8-2: IABノードの動作が指定される。(Release 16のソフトリソース可用性の暗黙的な決定の定義と同様) NA/soft-INA DU周波数リソースの場合、隣接するDUハード/ソフトIA周波数リソースの同時DU送受信(Tx/Rx)に影響を与えない場合にのみ、MTは周波数リソースのTx/Rx (IABノードはMT Tx/Rxの設定/表示を想定)のみを実行できる。または、隣接するDUハード/ソフトIA周波数で同時DU送受信(Tx/Rx)がある場合のみ実行できる。なお、MT送受信(Tx/Rx)のためにリソースは変更されない。そうでない場合、MTはこれらの周波数リソース、すなわちガードバンド上で、Tx/Rx (IABノードがMT Tx/Rxの設定/表示を想定しない)を行うことができない。
つづいて、ガードバンドが明示的に設定される動作例2について説明する。この例では、ガードバンドのパターンは明示的に設定される。図11は、ガードバンドが明示的に設定される動作例2を示す図である。
オプション1 ガードバンドは、hard/soft/NA DU周波数リソースタイプの構成と同じシグナリングで設定される(図3で上述したIABのFDMでの半静的リソース構成例参照)。DU周波数リソースのハード/ソフト/NAリソースタイプに加えて又は追加せずに、「ガードバンド」と見なされる「リソースタイプ」として再利用してもよい。バリエーションとして、ハード/ソフト/NAリソースタイプが設定されていない周波数リソースを「ガードバンド」としてもよい。
オプション2-1: 多数の連続するサブキャリア/RB/RBGが構成/表示される。開始サブキャリア/サブキャリアグループ/RB/RBグループと、連続するサブキャリア/サブキャリアグループ/RB/RBグループの数が設定/表示される。
オプション2-2: DU送信帯域幅内のサブキャリア/サブキャリアグループ/RB/RBグループに対応するビットマップが構成/表示される。「ガードバンド」として構成されている周波数リソースでは、DUは送受信(Tx/Rx)を実行できない。MTは送受信(Tx/Rx)を実行できないか、またはIABノードがMT送受信(Tx/Rx)による構成/表示を想定しない。
MT Tx/DU Tx (MT Tx/DU Tx);
MT Tx/DU Rx (MT Tx/DU Rx);
MT Rx/DU Tx (MT Rx/DU Tx);
MT Rx/DU Rx (MT Rx/DU Rx)
・FDMがサポートされているかどうか
・次のMT Tx/RXとDU Tx/Rxの各組み合わせに対してFDMがサポートされているかどうか
MT Tx/DU Tx (MT Tx/DU Tx);
MT Tx/DU Rx (MT Tx/DU Rx);
MT Rx/DU Tx (MT Rx/DU Tx);
MT Rx/DU Rx (MT Rx/DU Rx)
・ガードバンドが必要かどうか、およびガードバンドのサイズが必要かどうか。
・次のMT Tx/RXとDU Tx/Rxの組み合わせのそれぞれに必要なガードバンドの有無とサイズ
MT Tx/DU Tx (MT Tx/DU Tx);
MT Tx/DU Rx (MT Tx/DU Rx);
MT Rx/DU Tx (MT Rx/DU Tx);
MT Rx/DU Rx (MT Rx/DU Rx)
なお、MT Tx/DU Txなど、上記の組み合わせの一部ではガードバンドが不要な場合があるため、その組み合わせでは機能は不要である。
・次の組み合わせDU周波数リソースの境界で必要なガードバンドのサイズ
ハード/NA
ソフトIA (ソフト) /NA
ソフトINA (ソフト) ・ハード
ソフトIA/ソフトINA
なお、ガードバンドは上記の組み合わせのいくつかでは必要ないかもしれないので、その組み合わせでは能力は必要ない。
・スロット/Nスロット/シンボル/Nシンボル内で構成/表示/決定されるガードバンドの最大数
・スロット//Nスロット/シンボル/Nシンボル内のガードバンドとして設定/表示/決定されるサブキャリア/RB/RBGの最大数
他の実施の形態(バリエーション)として、上記の機能は、DUセルごと/MTサービングセルごと/{DUセル、MTサービングセル}のペアごとに実行できる。また、上記の実施の形態は対応するIABノード能力が対応する上位レイヤパラメータによってサポートおよび/または構成される場合にのみ適用される。
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、本実施形態に係るIABノード100Bあるいは基地局は、周波数分割多重で無線リソースを共有し得る、親ノード(親ノード100A)向けおよび下位ノード(子ノード100C)向けの接続に用いる接続部(上位ノード接続部170,下位ノード接続部180)と、親ノード(親ノード100A)向けおよび下位ノード(子ノード100C)向けの無線リソースについてのガードバンドの制御を行う制御部(制御部190)と、を備える。
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。
50 CU
100A 親ノード
100B IABノード
100C 子ノード
110 無線送信部
120 無線受信部
130 NW IF部
140 IABノード接続部
150 制御部
161 無線送信部
162 無線受信部
170 上位ノード接続部
180 下位ノード接続部
190 制御部
200 UE
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
Claims (5)
- 周波数分割多重で無線リソースを共有し得る、親ノード向けおよび下位ノード向けの接続に用いる接続部と、
前記親ノード向けおよび前記下位ノード向けの前記無線リソースについてのガードバンドの制御を行う制御部と、
を備えた無線通信ノード。 - 前記制御部は、
前記無線リソースに関する状態に基づいて前記ガードバンドを設定する、請求項1に記載の無線通信ノード。 - 前記制御部は、
前記ガードバンドに関する設定情報を、前記親ノードもしくは中央装置ないしはネットワークから受信する、請求項1に記載の無線通信ノード。 - 周波数分割多重で無線リソースを共有し得る、親ノード向けおよび下位ノード向けの接続に用いる接続部と、
前記親ノード向けおよび前記下位ノード向けの前記無線リソースについてのガードバンドの制御を行う制御部と、
を備えた基地局。 - 周波数分割多重で無線リソースを共有し得る、親ノード向けおよび下位ノード向けの接続を行うステップと、
前記親ノード向けおよび前記下位ノード向けの前記無線リソースについてのガードバンドの制御を行うステップと、
を含む無線通信方法。
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