Wireless base station and wireless communication method

Abstract

A wireless base station includes a first device and a second device. A first device receives a measurement report setting in a source-side second device, a reference signal setting for measurement in a target-side second device, and a transmission setting instruction. The first device performs control such that the measurement report setting and the reference signal setting are combined, and the combined measurement report setting and reference signal setting and the transmission setting instruction are transmitted to the terminal via the second device on the source side.

Description

Technical Field

[0001] The present disclosure relates to a wireless base station supporting L1 / L2 mobility and a wireless communication method. Background Art

[0002] The 3rd Generation Partnership Project (3GPP, a registered trademark) is standardizing the 5th generation mobile communication system (also known as 5G, New Radio (NR), or Next Generation (NG)), and is also standardizing the next generation known as Beyond 5G, 5G Evolution, or 6G.

[0003] For example, 3GPP Release 18 discusses the expansion of Layer 1 / Layer 2 mobility (L1 / L2 mobility). L1 / L2 mobility, also known as Lower Layer Triggered Mobility (LTM), is a technology related to the mobility of user equipment (UE) in Layer 1 or Layer 2, including UE migration (handover (HO)) to other cells, etc. (Non-Patent Document 1). HO based on L1 / L2 mobility is implemented through lower layers such as the Medium Access Control (MAC) layer.

[0004] In addition, support for L1 / L2 mobility between the CU (Central Unit) and DU (Distributed Unit) of a wireless base station (gNB) is being studied.

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-Patent Document 1: “Further NR Mobility Enhancements,” RP-222332, 3GPP TSG RAN Meeting #97-e, 3GPP, September 2022 Summary of the Invention

[0008] However, when L1 / L2 mobility is supported between CUs and DUs, the following problem is considered to exist. Specifically, when a UE performs L1 / L2 mobility-based HO from a CU on the source side of the HO source to a CU on the target side of the HO target, the Transmission Configuration Indication state (TCI state) and L1 measurement RS config in the DU on the target side cannot be provided to the CU on the source side, and the UE cannot perform the HO from the CU on the source side.

[0009] In addition, research is underway to report UE-based measurement results to a target DU that is a candidate for a HO target. In this case, uplink resources and measurement results for the measurement report cannot be shared between the source and target CUs and DUs, making it impossible for the UE to perform a HO based on L1 / L2 mobility.

[0010] Therefore, the following disclosure has been made in view of such circumstances, and an object thereof is to provide a radio base station and a radio communication method that can support reliable handover of UE while supporting L1 / L2 mobility between CU and DU.

[0011] One embodiment of the present disclosure is a wireless base station (gNB 100), which includes a first device and a second device, wherein the first device has: a receiving unit (wireless communication unit 110) that receives a transmission setting instruction in the second device from the second device; and a control unit (control unit 140) that controls so that the transmission setting instruction is sent to the terminal via the second device.

[0012] One embodiment of the present disclosure is a wireless base station including a first device and a second device, wherein the first device includes: a receiving unit that receives a reference signal setting for measurement in the second device from the second device; and a control unit that controls so that the reference signal setting is transmitted to a terminal via the second device.

[0013] One embodiment of the present disclosure is a wireless base station (gNB 100), which includes a first device and a second device, the first device having: a receiving unit (wireless communication unit 110) that receives a measurement report setting in the second device on the source side and a reference signal setting for measurement in the second device on the target side; and a control unit (control unit 140) that controls so that the measurement report setting and the reference signal setting are combined and the combined measurement report setting and the reference signal setting are sent to the terminal via the second device on the source side.

[0014] One embodiment of the present disclosure is a wireless base station (gNB 100), which includes a first device and a second device, wherein the second device on the source side includes: a receiving unit (wireless communication unit 110) that receives a reference signal setting in the second device on the target side via the first device; and a control unit (control unit 140) that controls so that the measurement report setting in the second device on the source side is combined with the received reference signal setting, and the combined measurement report setting and the reference signal setting are sent to the terminal via the first device.

[0015] One embodiment of the present disclosure is a wireless base station (gNB 100), which includes a first device and a second device, the first device having: a receiving unit (wireless communication unit 110) that receives a measurement report setting in the second device on a source side, a reference signal setting for measurement in the second device on a target side, and a transmission setting indication; and a control unit (control unit 140) that controls so that the measurement report setting is combined with the reference signal setting, and the combined measurement report setting, the reference signal setting, and the transmission setting indication are sent to a terminal via the second device on the source side.

[0016] One embodiment of the present disclosure is a wireless base station (gNB 100), which includes a first device and a second device, wherein the second device on the source side includes: a receiving unit (wireless communication unit 110) which receives a reference signal setting in the second device on the target side via the first device; and a sending unit (wireless communication unit 110) which sends the measurement report setting and the reference signal setting, which are a combination of the measurement report setting in the second device on the source side and the reference signal setting, and a sending setting indication in the second device on the target side to a terminal.

[0017] One embodiment of the present disclosure is a wireless base station (gNB 100), which includes a first device and a second device, wherein the first device includes: a receiving unit (wireless communication unit 110) that receives resource information indicating uplink resources for measurement reporting from the second device on the target side; and a sending unit that sends the resource information to the second device on the source side, and the second device on the source side includes a sending unit (wireless communication unit 110) that sends the resource information to a terminal.

[0018] One embodiment of the present disclosure is a wireless base station (gNB 100), which includes a first device and a second device, wherein the first device has: a receiving unit (wireless communication unit 110) that receives resource information representing uplink resources for measurement reporting from a target side wireless base station; and a sending unit (wireless communication unit 110) that sends the resource information to the target side wireless base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a diagram schematically illustrating the overall configuration of the wireless communication system 10 .

[0020] Figure 2 This is a diagram showing a control example based on L1 / L2 mobility.

[0021] Figure 3 This is a functional block diagram of gNB 100.

[0022] Figure 4 FIG. 2 is a functional block diagram of UE 200 .

[0023] Figure 5 This is a diagram showing a sequence example of L1 / L2 mobility according to Operation Example 1.

[0024] Figure 6 This is a diagram showing a sequence example of L1 / L2 mobility according to Operation Example 2 (Option 1).

[0025] Figure 7 This is a diagram showing a sequence example of L1 / L2 mobility according to Operation Example 2 (Option 2).

[0026] Figure 8 This is a diagram showing a sequence example of L1 / L2 mobility according to Operation Example 3 (Option 1).

[0027] Figure 9 This is a diagram showing a sequence example of L1 / L2 mobility according to Operation Example 3 (Option 2).

[0028] Figure 10 This is a diagram showing a sequence example of L1 / L2 mobility according to Operation Example 4.

[0029] Figure 11This is a diagram showing a structural example of a TCI state.

[0030] Figure 12 This is a diagram showing a configuration example of an L1 measurement RS config.

[0031] Figure 13 This is a diagram showing a structural example of an L1 measurement report configuration.

[0032] Figure 14 This is a diagram showing an example of the hardware structure of gNB 100 and UE 200.

[0033] Figure 15 2001 is a diagram showing a configuration example of a vehicle 2001 . DETAILED DESCRIPTION

[0034] Hereinafter, the embodiment will be described based on the drawings. The same or similar reference numerals will be given to the same functions and structures, and their description will be omitted as appropriate.

[0035] (1) Overall schematic structure of wireless communication system

[0036] Figure 1 This is a schematic diagram of the overall structure of a wireless communication system 10 according to this embodiment. Wireless communication system 10 is a 5G New Radio (NR)-compliant wireless communication system and includes a next-generation radio access network 20 (hereinafter referred to as NG-RAN 20) and a terminal 200 (User Equipment 200, hereinafter referred to as UE 200).

[0037] The wireless communication system 10 may also be a wireless communication system that complies with standards called Beyond 5G, 5G Evolution, or 6G, and may also include a wireless communication system that complies with standards called Long Term Evolution (LTE) or 4G. The wireless communication system 10 may support functions related to the Industrial Internet of Things (IIoT) and Ultra-Reliable and Low Latency Communications (URLLC).

[0038] NG-RAN 20 includes a radio base station 100 (hereinafter referred to as gNB 100). In addition, the specific structure of the wireless communication system 10, including the number of gNBs (which may also be eNBs, etc.) and UEs, is not limited to Figure 1 Example shown.

[0039] Furthermore, gNB 100 can utilize the fronthaul (FH) interface specified by the Open Radio Access Network Alliance (O-RAN). gNB 100 can include an O-RAN Distributed Unit (O-DU) and an O-RAN Radio Unit (O-RU). gNB 100 can function as a type of NG-RAN node.

[0040] The NG-RAN 20 actually consists of multiple NG-RAN nodes, specifically multiple gNBs (or ng-eNBs), connected to the 5G core network (5GC, not shown). The NG-RAN 20 and 5GC can be simply referred to as the "network." The 5GC incorporates the concept of CUPS (Control and User Plane Separation), which clearly separates the user and control plane functions.

[0041] The gNB 100 is a wireless base station that complies with NR and performs wireless communications with the UE 200. Furthermore, the gNB 100 can be configured to include a CU (Central Unit, the first device) and a DU (Distributed Unit, the second device). The DU can be located separately from the CU in a geographically different location. The CU can be connected to one or more DUs. Furthermore, gNBs 100 (gNB-CU) can be connected via an Xn interface, and CUs and DUs can be connected via an F1 interface (F1-AP, etc.).

[0042] The gNB 100 and UE 200 are capable of supporting Massive MIMO (Massive MIMO) that generates beams with higher directivity by controlling wireless signals sent from multiple antenna elements, Carrier Aggregation (CA) that bundles and uses multiple Component Carriers (CCs), and Dual Connectivity (DC) that simultaneously communicates between the UE and multiple NG-RAN nodes.

[0043] In the wireless communication system 10, not only Layer 3 mobility control (also referred to as L3 Mobility) of the UE 200 can be applied, but also Layer 1 and / or Layer 2 mobility control (also referred to as L1 / L2 Mobility or LTM) can be applied. L3 mobility can be interpreted as mobility control in the radio resource control layer (RRC). On the other hand, L1 / L2 mobility can be interpreted as mobility control in the physical layer (PHY), medium access control layer (MAC), radio link control layer (RLC), and packet data convergence protocol layer (PDCP).

[0044] The mobility of UE 200 may broadly refer to the ease of movement and maneuverability of UE 200, but in this embodiment, it may refer to minimization of call drops, radio link (including beam) failures, unnecessary handovers, ping-pong states, etc.

[0045] Figure 2 An example of control based on L1 / L2 mobility is shown. Figure 2 As shown, it is not the RRC included in Layer 3, but the MAC included in the lower layers (Layer 1 / Layer 2) that can perform measurement reporting, handover (HO) decisions from the source cell to the target cell (which may also include candidates), and management of timers (herein, labeled T3xx for convenience) for determining whether the HO is successful. T3xx can be interpreted as a timer set for the same purpose as timer T304 in L3, that is, a timer for determining whether the HO (cell relocation) is successful.

[0046] The MAC can report information related to measurement reports, HO decisions, and T3xx to the higher layer (RRC). Based on this report, the RRC can manage the status of radio resources accompanying the cell migration of the UE 200, etc.

[0047] In addition, in this embodiment, the channels include control channels and data channels. The control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), and PBCH (Physical Broadcast Channel).

[0048] In addition, data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel).

[0049] Reference signals include demodulation reference signals (DMRS), sounding reference signals (SRS), phase tracking reference signals (PTRS), and channel state information reference signals (CSI-RS). Signals include channels and reference signals. Furthermore, data may refer to data transmitted via a data channel.

[0050] (2) Functional block structure of wireless communication system

[0051] Next, the functional block structure of wireless communication system 10 is described. Specifically, the functional block structure of gNB 100 and UE 200 is described. Figure 3 This is a functional block diagram of gNB 100. Figure 4 FIG. 2 is a functional block diagram of UE 200 .

[0052] (2.1) gNB 100

[0053] like Figure 3 As shown, the gNB 100 includes a wireless communication unit 110, a switching processing unit 120, a measurement setting unit 130 and a control unit 140.

[0054] The wireless communication unit 110 transmits a downlink signal (DL signal) conforming to NR. In addition, the wireless communication unit 110 receives an uplink signal (UL signal) conforming to NR.

[0055] Furthermore, in the case of a CU (first device) of gNB 100, wireless communication unit 110 may receive the Transmission Configuration Indication state (TCI state) in a target-side DU (second device) from the DU. In this embodiment, wireless communication unit 110 may constitute a receiving unit. Furthermore, the TCI state (transmission configuration indication) of the DU may be received not directly from the DU but via the source-side DU and / or UE 200.

[0056] The TCI state provides information about antenna ports that are quasi-collocated (QCL) with the PDCCH antenna ports. If UE 200 has a specific CORESET (control resource set) that is spatially co-located with a specific CSI-RS, UE 200 can determine which beam is appropriate when receiving the PDCCH using that CORESET. Furthermore, QCL / TCI state / beam are interchangeable.

[0057] In the case of a CU on gNB 100, wireless communication unit 110 may receive the measurement reference signal configuration in the target DU, specifically, the L1 measurement RS configuration, from the target DU. Furthermore, the L1 measurement RS configuration for the DU may not be received directly from the target DU, but may be received via the source DU and / or UE 200.

[0058] The L1 measurement RS config may indicate a setting of a reference signal (RS) used for the UE 200 to perform measurements in lower layers. A configuration example of a TCI state and an L1 measurement RS config will be described later.

[0059] Alternatively, in the case of the CU of the gNB 100, the wireless communication unit 110 can receive the L1 measurement report config (measurement report configuration) in the DU on the source side and the L1 measurement RSconfig in the DU on the target side.

[0060] The L1 measurement report config may indicate a configuration for the UE 200 to perform measurement reporting in a lower layer. An example of the structure of the L1 measurement report config will be described later.

[0061] Alternatively, in the case of the CU of gNB 100, the wireless communication unit 110 can receive the L1 measurement report config (measurement report configuration) in the DU on the source side, the L1 measurement RSconfig and TCI state (TCI state) in the DU on the target side.

[0062] Furthermore, in the case of a CU of gNB 100, wireless communication unit 110 may receive resource information indicating uplink resources for measurement reports from the target DU. These uplink resources (UL resources) may be used for measurement reports from UE 200. Wireless communication unit 110 may also transmit the received resource information to the source DU. In this embodiment, wireless communication unit 110 may constitute a transmitting unit.

[0063] Alternatively, the wireless communication unit 110 may receive the resource information from the target side gNB 100 and send the resource information to the target side gNB 100 (which may be a CU or may refer to Inter-CU HO).

[0064] In the case of source side DU or target side DU of gNB 100, the wireless communication unit 110 can send the resource information to UE 200.

[0065] In the case of a source-side DU on gNB 100, wireless communication unit 110 may receive the L1 measurement RS configuration in the target-side DU via the CU. Furthermore, wireless communication unit 110 may transmit the L1 measurement report configuration and L1 measurement RS configuration (combined with the L1 measurement report configuration in the source-side DU and the received L1 measurement RS configuration) to UE 200, along with the TCI state in the target-side DU.

[0066] The handover processing unit 120 performs handover of the UE 200. Specifically, the handover processing unit 120 performs handover from the serving cell of the UE 200 to another neighboring cell.

[0067] The serving cell can be interpreted as simply the cell to which UE 200 is connected. However, more strictly speaking, in the case of an RRC_CONNECTED UE without carrier aggregation (CA), there is only one serving cell constituting the primary cell. In the case of an RRC_CONNECTED UE using CA, the serving cell can be interpreted as representing a set of one or more cells including the primary cell and all secondary cells.

[0068] In addition, the handover may include conditional handover (CHO) and / or DAPS (dual active protocol stack) handover. CHO can perform handover led by UE 200 when a specific execution condition is met. When CHO cannot be applied, a normal handover (also called CHO recovery) can be performed. In CHO recovery, after CHO failure, UE 200 performs cell selection. When a CHO candidate cell is selected, it is possible not to send RRCRestablishmentRequest to the candidate target cell, but to directly apply the conditional RRC reconfiguration of the cell for reconnection.

[0069] The execution conditions can be composed of one or two trigger conditions (CHO events A3 / A5 specified in 3GPP TS 38.331). A single reference signal (RS) type is triggered, and to evaluate the CHO execution conditions of a single candidate cell, up to two different trigger quantities (for example, RSRP (Reference Signal Received Power) and RSRQ (Reference Signal Received Quality), RSRP and SINR (Signal-to-Interference plus Noise Power Ratio), etc.) can be set simultaneously.

[0070] The measurement configuration unit 130 performs configuration (measurement configuration) of quality measurements of the serving cell and neighboring cells of the UE 200. Specifically, the measurement configuration unit 130 may perform measurement configuration in layer 3 or in layer 1 and / or layer 2.

[0071] The measurement configuration unit 130 can notify the UE 200 of the content of the measurement configuration. The UE 200 can measure the quality of the serving cell and / or neighboring cells based on the notified measurement configuration. The measurement configuration unit 130 can receive a measurement report from the UE 200 indicating the measurement result of the cell quality.

[0072] The control unit 140 controls the functional blocks that make up the gNB 100. In particular, in this embodiment, the control unit 140 can perform control as a CU (source side or target side) or a DU (source side or target side) in a gNB 100 having a CU-DU structure.

[0073] Specifically, in the case of a source-side CU of gNB 100, control unit 140 can control the transmission of the TCI state via the source-side DU to UE 200. More specifically, control unit 140 can transmit an RRC layer message including the TCI state obtained from the target-side DU to the source-side DU via wireless communication unit 110, and transmit the RRC layer message including the TCI state from the source DU to UE 200. Furthermore, the TCI state may be transmitted to UE 200 from the target-side DU rather than the source-side DU.

[0074] Furthermore, in the case of a source-side CU of gNB 100, control unit 140 can also control the transmission of the L1 measurement RS configuration to UE 200 via the source-side DU. Specifically, similar to the TCI state, control unit 140 can transmit an RRC layer message including the L1 measurement RS configuration obtained from the target-side DU to the source-side DU via wireless communication unit 110, and transmit the RRC layer message including the L1 measurement RS configuration from the source DU to UE 200. Furthermore, the L1 measurement RS configuration may be transmitted to UE 200 from the target-side DU rather than the source-side DU.

[0075] Alternatively, in the case of a source-side CU of gNB 100, control unit 140 may control to combine the L1 measurement report config and L1 measurement RS config obtained from the DU and transmit the combined L1 measurement report config and L1 measurement RS config via the source-side DU to UE 200. Specifically, control unit 140 may transmit an RRC layer message including the combined L1 measurement report config and L1 measurement RS config to the source DU via wireless communication unit 110, and transmit the RRC layer message including the combined L1 measurement report config and L1 measurement RS config from the source DU to UE 200.

[0076] Furthermore, in the case of a source-side DU of the gNB 100, the control unit 140 can also control the L1 measurement report config in the source-side DU to be combined with the received L1 measurement RS config, and the combined L1 measurement report config and L1 measurement RS config are transmitted via the source-side CU to the UE 200. Specifically, the control unit 140 can transmit an RRC layer message including the combined L1 measurement report config and L1 measurement RS config to the source CU via the wireless communication unit 110, and transmit the RRC layer message including the combined L1 measurement report config and L1 measurement RS config from the source CU to the UE 200. Furthermore, the RRC layer message including the combined L1 measurement report config and L1 measurement RS config may be transmitted to the UE 200 from the target-side CU rather than the source-side CU.

[0077] Furthermore, in the case of a source-side CU of gNB 100, control unit 140 can control the CU to combine the acquired L1 measurement report config and L1 measurement RS config, and transmit the combined L1 measurement report config, L1 measurement RS config, and TCI state via the source-side DU to UE 200. Specifically, control unit 140 can combine the L1 measurement report config and L1 measurement RS config, transmit an RRC layer message including the combined L1 measurement report config, L1 measurement RS config, and TCI state to the source DU via wireless communication unit 110, and transmit the RRC layer message including the combined L1 measurement report config, L1 measurement RS config, and TCI state from the source DU to UE 200.

[0078] In addition, a specific example of the timing between CU and D will be described further later.

[0079] (2.2)UE 200

[0080] like Figure 4 As shown, the UE 200 includes a wireless communication unit 210 , a measurement reporting unit 220 , a handover execution unit 230 , and a control unit 240 .

[0081] The wireless communication unit 210 transmits an uplink signal (UL signal) conforming to NR. In addition, the wireless communication unit 210 receives an uplink signal (DL signal) conforming to NR.

[0082] The measurement reporting unit 220 can measure the quality of the serving cell of the UE 200 and the neighboring cells of the serving cell and report the measurement results (Measurement Report) to the network. The measurement reporting unit 220 can perform measurement reporting of the source cell and the target cell during handover.

[0083] The quality of the measurement target may refer to, for example, the quality included in the measurement report (Measurement Report) specified in 3GPP TS38.331 (for example, Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ)).

[0084] The handover execution unit 230 executes handover of the UE 200. Specifically, the handover execution unit 230 can execute handover to the target cell (NG-RAN node) based on the control of the gNB 100.

[0085] Furthermore, the handover execution unit 230 can execute processes related to normal handover (conventional handover), conditional handover (CHO), and DAPS handover.

[0086] In the case of CHO, the handover execution unit 230 can migrate to the candidate cell when an execution condition is met. As described above, the execution condition can be determined based on the quality of the reference signal (RS), specifically, based on the value of RSRP, RSRQ, or SINR.

[0087] Furthermore, the migration target of CHO may or may not be accompanied by an SCG. In other words, the cell serving as the migration target based on CHO may be a single cell or may be composed of multiple cells (or a cell group) that comply with DC.

[0088] Furthermore, the handover execution unit 230 can perform handover based not only on L3 mobility but also on L1 / L2 mobility. Handover can be replaced by migration, cell migration, or cell selection. Specifically, the handover execution unit 230 can perform handover based on L1 / L2 mobility based on a command from at least one of Layer 1 and / or Layer 2.

[0089] The type of the command is not particularly limited, and may be, for example, an L1 / L2 mobility command. The L1 / L2 mobility command may be replaced by other commands of the RRC layer.

[0090] The control unit 240 controls each functional block constituting the UE 200. Specifically, the control unit 240 can execute control related to registration of the UE 200 with the network (waiting in a specific cell), measurement reporting, and handover of the UE 200.

[0091] In particular, in this embodiment, the control unit 240 controls measurements of cells including the serving cell. Specifically, the control unit 240 can control measurements in Layer 1 (and / or Layer 2) of the serving cell and neighboring cells. In other words, the control unit 240 can use Layer 1 (and / or Layer 2) functions to perform measurements (also referred to as L1 measurements) of the serving cell and neighboring cells.

[0092] If a failure occurs in Layer 1 (and / or Layer 2), the control unit 240 may notify the RRC of the station of the failure information. Furthermore, the failure information may also be notified to layers other than RRC (e.g., MAC, RLC, PDCP). The failure information is not particularly limited and may include identification information (ID) of the source cell (handover source), identification information (ID) of the target cell (handover target), and / or the quality of the cell (or beam).

[0093] Furthermore, the control unit 240 can perform L1 / L2 mobility, that is, mobility control of at least one of Layer 1 and Layer 2. Mobility control based on L1 / L2 mobility may include quality measurement of the service area and neighboring cells in Layer 1 or Layer 2, setting of candidate migration target cells, cell reselection (migration), handover, and the like.

[0094] (3) Operation of wireless communication system

[0095] Next, a description will be given of the operation of the wireless communication system 10. Specifically, the description will be given of the operation related to the handover between CUs and DUs using L1 / L2 mobility (LTM).

[0096] In addition, the L1 / L2 mobility of the UE 200 between DUs under the same CU can be called Intra-CU / Inter-DU LTM, and the L1 / L2 mobility of the UE 200 between DUs with different source and target CUs can be called Inter-CU LTM.

[0097] (3.1) Action Example 1

[0098] In Intra-CU / Inter-DU LTM, in order to implement direct handover to the beam of the target cell of UE 200 (forming the beam of the target cell), it is necessary to know the beam-level L1 measurement RS config and TCI state (TCI state info) of the target cell.

[0099] In this example, on the F1-AP interface, the target-side DU supports sending L1 measurement RSconfig and TCI state to the CU.

[0100] Figure 5 FIG. 1 shows a sequence example of L1 / L2 mobility involved in Action Example 1. Figure 5 As shown, in Intra-CU / Inter-DU LTM, the CU can request the target side DU in F1-AP for the TCI state (TCI state) of the target side DU (which can also be an LTM indication).

[0101] The target side DU may send the TCI state to the CU using the UE context setup response message. Alternatively, the target side DU may send the message to the CU in the TCI state contained in the RRC container (e.g., DU to CU RRC Information).

[0102] The CU may include the TCI state received from the target side DU in an RRC reconfiguration message and send a DL RRC message transfer message (which may also be a UE context modification request message) including the RRC reconfiguration message to the source side DU.

[0103] The source-side DU may send an RRCReconfiguration message including the TCI state to the UE 200 .

[0104] Figure 11 An example of the structure of the TCI state is shown in FIG. Figure 11As shown in FIG, as the candidate target cell ID, CGI (Cell Global Identifier), PCI (Physical Cell ID) or candidate cell config index can be applied. In addition, QCL type can also be applied with CGI, PCI or candidate cell config index.

[0105] In addition, if Figure 5 As shown, in Intra-CU / Inter-DU LTM, the CU can request the target side DU in F1-AP for the L1 measurement RS config (which can also be an LTM indication) of the target side DU.

[0106] The target DU may send the L1 measurement RS config to the CU using a UE context setup response message. Alternatively, the target DU may send the L1 measurement RS config message to the CU in an RRC container (e.g., DU to CU RRC Information) containing the L1 measurement RS config.

[0107] The CU may include the L1 measurement RS config received from the target side DU in an RRC reconfiguration message, and send a DL RRC message transfer message (which may also be a UE context modification request message) including the RRC reconfiguration message to the source side DU.

[0108] Figure 12 The following shows an example of the structure of L1 measurement RS config. Figure 12As shown, as the candidate target cell ID (Candidate target Cell ID), CGI, PCI or candidate cell config index can be applied.

[0109] (3.2) Action Example 2

[0110] In Intra-CU / Inter-DU LTM, the source-side DU configures the L1 measurement report config, while the target-side DU configures the L1 measurement RS config. Therefore, both configurations need to be combined and provided to the UE 200.

[0111] In this operation example, in the Intra-CU / Inter-DU LTM, the CU and DU cooperate with each other, so that the combined L1 measurement report config and L1 measurement RS config are provided to the UE 200 .

[0112] Figure 6 The following shows a sequence example of L1 / L2 mobility involved in Action Example 2 (Option 1). Figure 6 As shown, the source side DU can use the UE context modification response (UE context modification response) to send the L1 measurement report config to the CU.

[0113] The target-side DU may use the UE context setup response to send the L1 measurement RS config to the CU.

[0114] The CU may combine the received L1 measurement report config and L1 measurement RS config, and use DL RRC message transfer to send an RRCReconfiguration message including the combined L1 measurement report config and L1 measurement RS config to the source-side DU. The source-side DU may send the RRCReconfiguration message to the UE 200.

[0115] The combination of the L1 measurement report configuration and the L1 measurement RS configuration may mean simply combining the settings of both, or may mean partially (or entirely) combining common parts, for example.

[0116] Figure 7 The following shows a sequence example of L1 / L2 mobility involved in Action Example 2 (Option 2). Figure 7 As shown, the target side DU can use the UE context setup response (UE context setup response) to send L1measurement RSconfig to the CU.

[0117] The CU may use a UE context modification request to send the received L1 measurement RS config to the source-side DU.

[0118] The source-side DU may combine the L1 measurement report config and the L1 measurement RS config, and send a UE context modification response (UE context modification response) including the combined L1 measurement report config and the L1 measurement RS config to the CU.

[0119] The CU may use DL RRC message transfer to send an RRCReconfiguration message including the combined L1 measurement report config and L1 measurement RS config to the source-side DU. The source-side DU may send the RRCReconfiguration message to the UE 200 .

[0120] Alternatively, the source-side DU may not send a UE context modification response including the L1 measurement report config and the L1 measurement RS config. Furthermore, the CU may not send an RRCReconfiguration including the combined L1 measurement report config and the L1 measurement RS config. Instead, the source-side DU may directly send an RRCReconfiguration including the L1 measurement report config and the L1 measurement RS config.

[0121] Alternatively, the source DU may directly establish an interface with the target DU. The source DU may directly obtain the L1 measurement RS config from the target DU via the interface and combine it with the L1 measurement report config to configure it for the UE 200. Alternatively, the source DU may send it to the CU and use RRC Reconfiguration to send it to the UE.

[0122] Figure 13 The following shows an example of the structure of L1 measurement report config. Figure 13 As shown in the figure, the target cell ID (Target Cell ID) can be CGI, PCI, or candidate cell config index. In addition, ReportQuantity can include the SINR of the synchronization signal block (SSB (Synchronization Signal: Synchronization Signal) / PBCH (Physical Broadcast CHannel: Physical Broadcast Channel) Block) or CSI-RS.

[0123] (3.3) Action Example 3

[0124] In Inter-CU LTM, the TCI state and L1 measurementRS config of the target DU need to be provided to the source DU. The source DU performs configuration for the UE 200 based on the TCI state and L1 measurementRS config of the target DU.

[0125] In this operation example, in Inter-CU LTM, the CU and DU cooperate to provide the combined L1 measurement report config and L1 measurement RS config to the UE 200 .

[0126] Figure 8 The following is a sequence example of L1 / L2 mobility involved in Action Example 3 (Option 1). Figure 8 As shown, when the source-side DU sends a handover request to the target-side CU via the Xn interface, it may include an LTM indication (LTMindication) or an explicit request for L1 measurement RS config and TCI state (TCI state).

[0127] The target-side CU may use a UE context setup request to request the target-side DU for L1 measurement RS config and TCI state.

[0128] The target-side DU may use the UE context setup response to send back the L1 measurement RS config and TCI state to the target-side CU.

[0129] The target CU may send a handover request acknowledgment (Handover Request Ack) including the L1 measurement RS config and TCI state to the source CU (or an RRCReconfiguration msg including the L1 measurement RS config and TCI state may be included in the handover request acknowledgment (Handover Request Ack) as an RRC container).

[0130] The source CU can use the UE context modification request to request the L1 measurement report config from the source DU. The source DU can use the UE context modification response to send the L1 measurement report config back to the source CU.

[0131] The source CU may combine the L1 measurement report config and the L1 measurement RS config, and use DL RRC message transfer to send an RRCReconfiguration message including the combined L1 measurement report config and L1 measurement RS config, as well as the TCI state, to the source DU. The source DU may send the RRCReconfiguration message to the UE 200.

[0132] Figure 9 The following shows a sequence example of L1 / L2 mobility involved in Action Example 3 (Option 2). Figure 9 As shown, the steps until the target CU sends a handover request acknowledgment (Handover Request Ack) including the L1 measurement RS config and the TCI state (TCI state) to the source CU are the same as those in Option 1.

[0133] The source-side CU may use a UE context modification request to send the L1 measurement RS config to the source-side DU.

[0134] The source-side DU may combine the L1 measurement report config and the L1 measurement RS config, and send a UE context modification response including the combined L1 measurement report config and the L1 measurement RS config to the source-side CU. The source-side CU may use DL RRC message transfer to send an RRCReconfiguration including the combined L1 measurement report config and the L1 measurement RS config, as well as the TCI state, to the source-side DU. The source-side DU may send the RRCReconfiguration to the UE 200.

[0135] (3.4) Action Example 4

[0136] Regarding layer 1 (L1) measurement reporting, the following options are envisaged.

[0137] (Option 1): Report to the serving DU

[0138] (Option 2): Report to the candidate target DU

[0139] In the case of option 2, it is necessary to enable coordination between the CU and the DU regarding UL resources for measurement reporting and measurement results.

[0140] In this operation example, when measurement results based on L1 measurement reporting are reported to target-side DU candidates, the CU and DU share UL resources and measurement results for measurement reporting, thereby supporting HO based on L1 / L2 mobility.

[0141] Figure 10 FIG. 4 shows a sequence example of L1 / L2 mobility involved in Action Example 4. Figure 10 As shown, in Intra-CU / Inter-DU LTM, the CU can use the UE context setup request to request the target side DU for L1 measurement reporting UL resources.

[0142] The target side DU may report L1 measurement reporting UL resource to the CU. The CU may send the L1 measurement reporting UL resource to the source side DU, and the source side DU may send the L1 measurement reporting UL resource to the UE 200.

[0143] Alternatively, after UE 200 reports the L1 measurement report to the target DU, the target DU may use a UE CONTEXT MODIFICATION REQUIRED message or an UL RRC message to send the L1 measurement results to the CU. The CU may use a UE CONTEXT MODIFICATION CONFIRM message or a DL RRC message to send the L1 measurement results to the source DU.

[0144] In addition, in the case of Inter-CU LTM, the source CU can request L1 measurement reporting UL resources when sending a handover request to the target CU. The target CU can report the measurement reporting UL resources to the source CU using the handover request ack. In this case, the source gNB and the target gNB can exchange L1 measurement results via the Xn interface.

[0145] (4) Action and Effect

[0146] The above-described embodiments achieve the following effects. Specifically, gNB 100 (CU and DU) can obtain the TCI state, L1 measurement report config, and L1 measurement RS config in Intra-CU / Inter-DU LTM or Inter-CU LTM, and can reliably and promptly provide the settings required for handover to UE 200.

[0147] In addition, gNB 100 (CU and DU) can share uplink resources and measurement results for measurement reports in Intra-CU / Inter-DU LTM or Inter-CU LTM, and UE200 can perform reliable switching.

[0148] That is, according to gNB 100, more reliable cell migration (beam migration) of UE 200 applying L1 / L2 mobility (LTM) can be achieved.

[0149] (5) Other Implementation Methods

[0150] Although the embodiment has been described above, it is obvious to those skilled in the art that the present invention is not limited to the description of the embodiment, and various modifications and improvements can be made.

[0151] For example, in the above embodiment, the CU is referred to as the first device and the DU is referred to as the second device. However, the target-side CU may also be referred to as the second device. Alternatively, the source-side DU may also be referred to as the first device. Furthermore, the CU may also be referred to as a central device, etc., and the DU may also be referred to as a distributed device, etc.

[0152] Furthermore, in the above descriptions, configure, activate, update, indicate, enable, specify, and select are interchangeable. Similarly, link, associate, correspond, and map are interchangeable, and allocate, assign, monitor, and map are interchangeable.

[0153] Furthermore, the terms specific, dedicated, UE-specific, and UE-dedicated may be used interchangeably. Similarly, the terms common, shared, group-common, UE-common, and UE-shared may be used interchangeably.

[0154] The block diagram used in the description of the above embodiment ( Figure 3 、 4 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using one device that is physically or logically combined, or can be implemented using multiple devices by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections). The functional blocks can also be implemented by combining software in the above-mentioned one device or the above-mentioned multiple devices.

[0155] Functions include, but are not limited to, judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that performs a transmitting function is referred to as a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0156] Furthermore, the above-mentioned gNB 100 and UE 200 (the device) can also function as computers that process the wireless communication method disclosed in the present invention. Figure 14 FIG. 1 is a diagram showing an example of the hardware structure of the device. Figure 14 As shown, the device may also 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 , and a bus 1007 .

[0157] In the following description, the word "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of the device may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0158] Each functional block of the device (refer to Figure 3 、 4 ) is implemented by any hardware element in the computer device, or a combination of such hardware elements.

[0159] In addition, each function in the device is implemented by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls the communication of the communication device 1004 or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0160] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control unit, a calculation unit, registers, and the like.

[0161] In addition, the processor 1001 reads programs (program code), software modules, data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a part of the actions described in the above embodiments is used. In addition, the various processes described above can be performed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 can also be implemented by one or more chips. In addition, the program can also be sent from the network via a telecommunications line.

[0162] The memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and a random access memory (RAM). The memory 1002 may be referred to as a register, a cache memory, or a main memory (main storage device). The memory 1002 may store programs (program code), software modules, and the like that enable execution of the method according to an embodiment of the present disclosure.

[0163] The memory 1003 is a computer-readable recording medium and may be composed of, for example, at least one of an optical disk such as a compact disc read-only memory (CD-ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic stripe, and the like. The memory 1003 may also be referred to as an auxiliary storage device. The aforementioned recording medium may be, for example, a database, a server, or other appropriate medium that includes at least one of the memory 1002 and the memory 1003.

[0164] The communication device 1004 is hardware (transceiver) 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, etc.

[0165] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0166] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0167] Furthermore, the processor 1001, the memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses between devices.

[0168] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented using this hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0169] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI), high-layer signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block (Master Information Block: MIB), System Information Block (System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0170] Each form / embodiment described in the present disclosure can also be applied to a mobile communication system using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (x is, for example, an integer or a decimal), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE At least one of 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other appropriate systems, and next-generation systems based on and extended from these systems. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G, etc.) may also be employed.

[0171] The processing procedures, timings, and flows of each form / implementation described in this disclosure may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0172] In this disclosure, specific actions performed by a base station may also be performed by its upper node, depending on the circumstances. In a network consisting of one or more network nodes including a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (e.g., an MME or S-GW, but not limited thereto). While the above example illustrates a single other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., an MME and an S-GW).

[0173] It is possible to output information or signals (such as information) from a higher layer (or lower layer) to a lower layer (or higher layer), and it is also possible to input and output via multiple network nodes.

[0174] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0175] The determination may be made using a value represented by one bit (0 or 1), a Boolean value (Boolean: true or false), or a comparison of numerical values ​​(for example, comparison with a predetermined value).

[0176] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched between them depending on the execution. Furthermore, notification of predetermined information (e.g., notification of "yes X") is not limited to being performed explicitly, but may also be performed implicitly (e.g., not notifying the predetermined information).

[0177] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0178] Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, if software is transmitted from a web page, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0179] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0180] In addition, the terms used in this disclosure and those required for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0181] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0182] In addition, the information, parameters, etc. described in this disclosure can be expressed using absolute values, relative values ​​relative to predetermined values, or other corresponding information. For example, wireless resources can be indicated using indexes.

[0183] The names used for the above parameters are non-limiting in any respect. Furthermore, the formulas and the like using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any appropriate names, and therefore the names assigned to these channels and information elements are non-limiting in any respect.

[0184] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. Base stations are also sometimes referred to as macrocells, small cells, femtocells, and picocells.

[0185] A base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station (Remote Radio Head: RRH)) for indoor use.

[0186] The terms "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0187] In the present disclosure, the base station sending information to the terminal may be replaced by the base station instructing the terminal to perform control / action based on the information.

[0188] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0189] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: 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 terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0190] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (for example, a car, an airplane, etc.), a mobile body that moves unmanned (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0191] In addition, the base station in the present disclosure can also be replaced by a mobile station (user terminal, the same below). For example, regarding a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, it can also be called D2D (Device-to-Device: device to device), V2X (Vehicle-to-Everything: vehicle to everything system), etc.), the various forms / implementations of the present disclosure can also be applied. In this case, it can also be set as a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be replaced by side channels (or side links).

[0192] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0193] A radio frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be called a subframe. A subframe can also be composed of one or more time slots in the time domain. A subframe can be a fixed time length (e.g., 1 ms) that is independent of the numerology.

[0194] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0195] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0196] A time slot may contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in time units larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

[0197] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may be referred to by other corresponding names.

[0198] For example, a subframe can be called a transmission time interval (TTI), multiple consecutive subframes can be called a TTI, and a slot or mini-slot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be called a slot, a mini-slot, or the like, rather than a subframe.

[0199] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules the allocation of radio resources (such as the frequency bandwidth and transmit power available to each user terminal) to each user terminal using TTIs. The definition of TTI is not limited to this.

[0200] A TTI can be a unit of time for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, or a unit of processing such as scheduling and link adaptation. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0201] In addition, when one time slot or one mini-time slot is called a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can be the minimum time unit for scheduling. In addition, the number of time slots (mini-time slots) that constitute the minimum time unit for scheduling can be controlled.

[0202] A TTI with a time length of 1 ms may also be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0203] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be replaced with a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be replaced with a TTI with a TTI length smaller than long TTI (longTTI) and greater than 1ms.

[0204] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more contiguous subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined based on the parameter set.

[0205] In addition, the time domain of an RB may include one or more symbols and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0206] In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0207] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0208] A Bandwidth Part (BWP) (also referred to as a fractional bandwidth) represents a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point for that carrier. PRBs can be defined within a BWP and numbered within that BWP.

[0209] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0210] At least one of the configured BWPs may be active, and the UE may not assume that it will transmit or receive predetermined signals / channels outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0211] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the structures, such as the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0212] The terms "connected", "coupled" or any variation of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include situations where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used instead of "connection". As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region and optical (visible and invisible) region may be used to "connect" or "couple" to each other.

[0213] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applicable standard.

[0214] The phrase “based on” used in this disclosure does not mean “based only on” unless explicitly stated otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0215] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section,” “circuit,” “device,” or the like.

[0216] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily define the number or order of these elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used there, or that the first element must precede the second element in some form.

[0217] When the terms "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," are intended to be inclusive. Furthermore, the term "or" used in this disclosure does not mean an exclusive or.

[0218] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes cases where the noun following the article is in a plural form.

[0219] As used in this disclosure, terms such as “determining” and “determining” sometimes encompass a variety of actions. For example, “determining” and “determining” may include considering matters such as judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), and ascertaining as matters that have been “determined” or “determined.” Furthermore, “determining” and “determining” may include considering matters such as receiving (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, and accessing (e.g., accessing data in a memory) as matters that have been “determined” or “determined.” Furthermore, “determining” and “determining” may include considering matters such as resolving, selecting, choosing, establishing, and comparing as matters that have been “determined” or “determined.” That is, "judgment" and "decision" can include matters where certain actions are considered to have been "judged" or "decided." In addition, "judgment (decision)" can also be replaced by "assuming (assuming)", "expecting (expecting)", "considering (considering)", etc.

[0220] In this disclosure, the phrase "A and B are different" can mean "A and B are different from each other." Alternatively, the phrase can mean "A and B are each different from C." Terms such as "separate" and "combined" can also be interpreted in the same way as "different."

[0221] Figure 15 2001 shows a structural example of a vehicle. Figure 15 As shown, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a gear lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012 and a communication module 2013.

[0222] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid power of an engine and a 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 the rear wheels based on the operation of the steering wheel by the user. 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 also be referred to as an ECU (Electronic Control Unit).

[0223] As signals from various sensors 2021 to 2028, there are current signals from the current sensor 2021 that senses the current of the motor, speed signals of the front and rear wheels obtained by the speed sensor 2022, air pressure signals of the front and rear wheels obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression amount signals obtained by the accelerator pedal sensor 2029, brake pedal depression amount signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, detection signals for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 2028, etc.

[0224] Information service unit 2012 is comprised of various devices, such as a car navigation system, audio system, speakers, a television, and a radio, for providing (outputting) various information, including driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. Information service unit 2012 utilizes information obtained from external devices via communication module 2013 and the like to provide various multimedia information and services to vehicle 1 passengers.

[0225] The information service unit 2012 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0226] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents or reducing the driver's driving load, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning devices (such as GNSS), map information (such as high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyroscope systems (such as IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, AI processors, and one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 sends and receives various information via the communication module 2013 to implement driving assistance functions or autonomous driving functions.

[0227] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via the communication port. For example, the communication module 2013 can transmit and receive data via the communication port 2033 with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, the microprocessor 2031 in the electronic control unit 2010, the memory (ROM, RAM) 2032, and the sensors 2021 to 2028 included in the vehicle 2001.

[0228] The communication module 2013 is controlled by the microprocessor 2031 of the electronic control unit 2010 and is a communication device capable of communicating with external devices. For example, various information can be transmitted and received with the external device via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. The external device can also be, for example, a base station or a mobile station.

[0229] The communication module 2013 can transmit at least one of the signals input to the electronic control unit 2010 from the various sensors 2021-2028, information obtained based on these signals, and information based on external (user) input received via the information service unit 2012 to an external device via wireless communication. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, and the like can also be referred to as input units that receive input. For example, the PUSCH transmitted by the communication module 2013 can include information based on these inputs.

[0230] 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 of the vehicle. The information service unit 2012 can also be referred to as an output unit that outputs information (for example, outputs information to a display, speaker, or other device based on the PDSCH received by the communication module 2013 (or data / information decoded from the PDSCH)). In addition, the communication module 2013 stores various information received from external devices in the memory 2032 that can be used by the microprocessor 2031. The microprocessor 2031 can also control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, gear lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021 to 2028, etc. of the vehicle 2001 based on the information stored in the memory 2032.

[0231] While the present disclosure has been described in detail above, it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in various modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning on the present disclosure.

[0232] Description of labels

[0233] 10: Wireless communication system

[0234] 20: NG-RAN

[0235] 100: gNB

[0236] 110: Wireless Communications Department

[0237] 120: Switching processing unit

[0238] 130: Measurement setting unit

[0239] 140: Control Department

[0240] 200:UE

[0241] 210: Wireless Communications Department

[0242] 220: Measurement Report Department

[0243] 230: Switch execution unit

[0244] 240: Control Department

[0245] 1001: Processor

[0246] 1002: Memory

[0247] 1003: Memory

[0248] 1004: Communication device

[0249] 1005: Input device

[0250] 1006: Output device

[0251] 1007: Bus

[0252] 2001: Vehicles

[0253] 2002: Drive Department

[0254] 2003: Steering

[0255] 2004: Accelerator pedal

[0256] 2005: Brake pedal

[0257] 2006: Gear Shifter

[0258] 2007: Left and right front wheels

[0259] 2008: Left and right rear wheels

[0260] 2009: Axles

[0261] 2010: Electronic Control Department

[0262] 2012: Information Services Department

[0263] 2013: Communication Module

[0264] 2021: Current Sensors

[0265] 2022: Speed ​​Sensor

[0266] 2023: Air pressure sensor

[0267] 2024: Vehicle speed sensor

[0268] 2025: Accelerometers

[0269] 2026: Brake pedal sensor

[0270] 2027: Gearshift sensor

[0271] 2028: Object detection sensors

[0272] 2029: Accelerator pedal sensor

[0273] 2030: Driving Assistance Systems Division

[0274] 2031: Microprocessor

[0275] 2032: Memory (ROM, RAM)

[0276] 2033: Communication port

Claims

1. A wireless base station comprising a first device and a second device, The first device comprises: a receiving unit configured to receive a measurement report configuration in the second device on the source side, a reference signal configuration for measurement in the second device on the target side, and a transmission configuration instruction; and A control unit controls so that the measurement report setting is combined with the reference signal setting, and the combined measurement report setting and the reference signal setting and the transmission setting instruction are sent to the terminal via the second device on the source side.

2. A wireless base station comprising a first device and a second device, The second device on the source side includes: a receiving unit configured to receive a reference signal setting in the second device on the target side via the first device; and A transmitting unit transmits to a terminal the measurement report configuration and the reference signal configuration obtained by combining the measurement report configuration and the reference signal configuration in the second device on the source side, and a transmission configuration instruction in the second device on the target side.

3. A wireless base station comprising a first device and a second device, The first device comprises: a receiving unit that receives resource information indicating uplink resources for measurement reporting from the second device on the target side; and a sending unit that sends the resource information to the second device on the source side, The second device on the source side includes a transmitting unit that transmits the resource information to a terminal.

4. A wireless base station comprising a first device and a second device, The first device comprises: a receiving unit that receives resource information indicating uplink resources for measurement reporting from the target-side radio base station; and A sending unit sends the resource information to the target-side wireless base station.

5. A wireless communication method performed by a wireless base station including a first device and a second device, The wireless communication method comprises the following steps: The first device receives a measurement report setting in the second device on the source side, and a reference signal setting for measurement and a transmission setting instruction in the second device on the target side; and The first device controls so as to combine the measurement report configuration and the reference signal configuration, and transmit the combined measurement report configuration and the reference signal configuration and a transmission configuration instruction to the terminal via the second device on the source side.

6. A wireless communication method performed by a wireless base station including a first device and a second device, The wireless communication method comprises the following steps: The second device on the source side receives the reference signal setting in the second device on the target side via the first device; and The second device on the source side combines the measurement report setting in the second device on the source side with the reference signal setting, and sends the combined measurement report setting and reference signal setting and the transmission setting instruction in the second device on the target side to the terminal.

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