Terminal and wireless base station

Abstract

To provide an apparatus, a method, and a system that appropriately perform propagation delay compensation based on Round-Trip Time (RTT).SOLUTION: In a wireless communication system, a base station gNB transmits a measurement request to a terminal UE instructing the terminal to measure a first time difference between a transmission timing of a first signal and a reception timing of a second signal, receives a measurement result from the terminal on the basis of receiving the measurement request including time difference information indicating the first time difference, obtains a second time difference between the reception timing of the first signal and the transmission timing of the second signal at the base station, calculates a propagation delay to the terminal on the basis of the first time difference and the second time difference, and performs propagation delay compensation.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present disclosure relates to a terminal and a radio base station that support propagation delay compensation. [Background technology]

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

[0003] 3GPP Release-17 aims to achieve even more accurate synchronization between radio base stations (gNBs) and terminals (User Equipment, UE) in order to support the Industrial Internet of Things (IIoT) and URLLC (Ultra-Reliable and Low Latency Communications) (Non-Patent Document 1).

[0004] In such a case, compensation for the propagation delay in the wireless section between the UE and the gNB is essential. 3GPP has agreed to consider not only propagation delay compensation using Timing Advance (TA) but also propagation delay compensation using Round-Trip Time (RTT) between the UE and the gNB (RTT based delay compensation) (Non-Patent Document 2). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Enhanced Industrial Internet of Things (IoT) and ultra-reliable and low latency communication (URLLC) support for NR", RP-201310, 3GPP TSG RAN Meeting #88e, 3GPP, July 2020 [Non-Patent Document 2] "Summary#1 of email discussion [102-e-NR-IIOT_URLLC_enh-05]", R1-2007068, 3GPP TSG RAN WG1 Meeting #102-e, 3GPP, August 2020 Summary of the Invention

[0006] In the case of RTT-based propagation delay compensation, the timing of notifying the gNB of the time difference between the transmitted signal and the received signal measured by the UE becomes an issue. In addition, in the case of RTT-based propagation delay compensation, the timing of performing the propagation delay compensation using the RTT becomes an issue.

[0007] In other words, the UE and gNB need to cooperate to exchange RTT-related information; if such cooperation is not possible, it will be difficult to compensate for RTT-based propagation delay.

[0008] Therefore, the following disclosure has been made in consideration of the above circumstances, and aims to provide a terminal and a wireless base station that can appropriately perform propagation delay compensation based on the RTT.

[0009] One aspect of the present disclosure is a terminal (UE 200) that includes a control unit (control unit 240) that acquires the time difference between the transmission timing of a first signal and the reception timing of a second signal, and a transmission unit (time information processing unit 230) that transmits time difference information indicating the time difference to a radio base station if the time difference exceeds a specified threshold.

[0010] One aspect of the present disclosure is a radio base station (gNB100) comprising a receiving unit (time management unit 130) that receives time difference information indicating a first time difference between the transmission timing of a first signal and the reception timing of a second signal at a terminal, and a control unit (control unit 140) that, when the time difference information is received, acquires a propagation delay to the terminal based on the first time difference and a second time difference between the reception timing of the first signal and the transmission timing of the second signal.

[0011] One aspect of the present disclosure is a terminal (UE200) comprising a receiving unit (time information processing unit 230) that receives time difference information indicating a first time difference between the reception timing of a first signal and the transmission timing of a second signal at a radio base station, and a control unit (control unit 240) that, when the time difference information is received, acquires a propagation delay with the radio base station based on the first time difference and a second time difference between the transmission timing of the first signal and the reception timing of the second signal. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. As shown in FIG. [Diagram 2] Figure 2 is a functional block diagram of gNB100. [Diagram 3] FIG. 3 is a functional block diagram of UE 200. [Figure 4] FIG. 4 is a diagram illustrating an example of a calculation and reporting sequence of a UE Rx-Tx time difference and a gNB Rx-Tx time difference using a UL-RS and a DL-RS. [Diagram 5] FIG. 5 is a diagram showing an example of a schematic operation sequence of UE-triggered RTT based delay compensation. [Figure 6] Figure 6 is a diagram showing an example of a schematic operation sequence of RTT based delay compensation triggered by gNB. [Figure 7] FIG. 7 is a diagram showing an example of the hardware configuration of gNB100 and UE200. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and the description thereof will be omitted as appropriate.

[0014] (1) Overall configuration of wireless communication system 1 is a schematic diagram of an overall configuration of a wireless communication system 10 according to this embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a user equipment 200 (User Equipment 200, hereinafter, UE 200).

[0015] The wireless communication system 10 may be a wireless communication system conforming to a standard called Beyond 5G, 5G Evolution, or 6G.

[0016] The NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). Note that the specific configuration of the radio communication system 10, including the number of gNBs and UEs, is not limited to the example shown in FIG.

[0017] The NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5GC 30 that is a core network conforming to 5G. The NG-RAN 20 and the 5GC 30 may be simply expressed as a "network."

[0018] The 5GC 30 may be provided with a User Plane Function 35 (hereinafter, UPF 35) that is included in the 5G system architecture and provides a user plane function. The UPF 35 can be connected to a TSN Grandmaster 25 (hereinafter, TSC GM 25) that provides time information used in a Time Sensitive Network (TSN) via a specific interface. The TSC GM 25 can provide highly accurate time information (date and time) to an IoT device 40 connected to a UE 200 via an NG-RAN 20 or the like. The IoT device 40 may be called an end station or the like.

[0019] For example, TSN can be used as a network for the Industrial Internet of Things (IIoT). TSN may be configured as a network separate from the NG-RAN 20 and the 5GC 30, i.e., the NR (5G) system, and may be synchronized with the timing generated by an independent clock.

[0020] TSN may include networks related to services that require high synchronization accuracy over a wide service area, such as smart grids.

[0021] The gNB 100 is a radio base station conforming to NR, and performs radio communication conforming to NR with the UE 200. The gNB 100 and the UE 200 can support Massive MIMO, which generates a more directional beam by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which uses a bundle of multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates between the UE and each of multiple NG-RAN Nodes.

[0022] The IoT device 40 may be a communication device (terminal) included in the TSN, for example, the IIoT, and may be synchronized with timing (time information) within the TSN.

[0023] Thus, in this embodiment, the TSC GM25 and the IoT device 40 can be connected to the NR (5G) system, and a mechanism is provided to compensate for propagation delay between the UE 200 and the gNB 100.

[0024] The IoT device 40 connected to the UE 200 can operate in synchronization with the TSN time information provided by the TSC GM 25. Meanwhile, in the NR (5G) system, the time information used in the system is provided by the 5G Grandmaster (5G GM). The UPF 35, the gNB 100, and the UE 200 can operate in synchronization with the 5G GM time information.

[0025] Moreover, in order to achieve high synchronization accuracy (for example, less than 1 μsec), the propagation delay between the UE 200 and the gNB 100 can be compensated. Specifically, in the wireless communication system 10, the propagation delay in the wireless section between the UE 200 and the gNB 100 (specifically, a Distributed Unit (DU)) to which the UE 200 is connected can be compensated. The propagation delay compensation may be interpreted as adjusting the time information for the NR system or TSN according to the amount of propagation delay in the wireless section, so that each of the IoT devices 40 can operate in synchronization with the time information for TSN. More simply, it may be interpreted as adjusting the time information to the time information obtained by subtracting the propagation delay between the UE 200 and the gNB 100 (wireless section) from the time information for TSN.

[0026] Alternatively, propagation delay compensation may be interpreted as adjusting the time information to be obtained by subtracting the propagation delay between UE200 and gNB100 (wireless section) from the 5G GM time information, and may also be interpreted as meaning that if accurate synchronization can be maintained within the 5G system, the 5G system will act as a TSN bridge and each TSN IoT device will be able to operate in synchronization with the TSN time.

[0027] In addition, in the wireless communication system 10, in addition to propagation delay compensation using Timing Advance (TA), a mechanism of propagation delay compensation using Round-Trip Time (RTT) (RTT based delay compensation) may be introduced between the UE 200 and the gNB 100.

[0028] (2) Functional block configuration of wireless communication system Next, a functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configurations of the gNB 100 and the UE 200 will be described.

[0029] Fig. 2 is a functional block diagram of the gNB100. Fig. 3 is a functional block diagram of the UE200. Note that Figs. 2 and 3 only show main functional blocks related to the description of the embodiments, and that the gNB100 and the UE200 have other functional blocks (e.g., a power supply unit, etc.). Figs. 2 and 3 show functional block configurations of the gNB100 and the UE200, and for the hardware configuration, please refer to Fig. 7.

[0030] (2.1) gNB100 As shown in FIG. 2, the gNB 100 includes a radio communication unit 110, a reference signal processing unit 120, a time management unit 130 and a control unit 140.

[0031] The wireless communication unit 110 transmits and receives wireless signals conforming to NR. Specifically, the wireless communication unit 110 receives uplink signals (UL signals) conforming to NR and transmits downlink signals (DL signals) conforming to NR. The wireless communication unit 110 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and each of two NG-RAN nodes.

[0032] The wireless communication unit 110 also transmits and receives various channels of the physical layer, including a control channel and a data channel.

[0033] The control channels may include a Physical Downlink Control Channel (PDCCH), a Physical Uplink Control Channel (PUCCH), a Random Access Channel (RACH, Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), and a Physical Broadcast Channel (PBCH), etc.

[0034] The data channel includes a Physical Downlink Shared Channel (PDSCH), a Physical Uplink Shared Channel (PUSCH), etc. Data may refer to data transmitted via a data channel.

[0035] The reference signal processing unit 120 performs processing related to a reference signal. The reference signal may be interpreted as a known pilot signal between the base station and the terminal. Specifically, the reference signal processing unit 120 performs processing related to the DL direction, that is, the reference signal (which may be called DL-RS) transmitted by the gNB 100. Moreover, the reference signal processing unit 120 performs processing related to the UL direction, that is, the reference signal (which may be called UL-RS) received by the gNB 100.

[0036] The DL-RS may include, for example, a Positioning Reference Signal (PRS) for position information, a Tracking Reference Signal (TRS) for tracking, a Demodulation Reference Signal (DMRS), etc. The DL-RS may include other DL direction RSs. In this embodiment, the DL-RS may include SSs constituting Synchronization Signal / Physical Broadcast Channel blocks (SS / PBCH).

[0037] The UL-RS may include, for example, a Sounding Reference Signal (SRS), a TRS, a DMRS, etc. The UL-RS may include other UL direction RSs. In the present embodiment, the UL-RS may include a Physical Random Access Channel (PRACH).

[0038] The time management unit 130 manages time information used in the wireless communication system 10. Specifically, the time management unit 130 manages time information of the TSN and time information of the NR (5G) system.

[0039] The time management unit 130 can acquire time information of the TSN from the TSC GM 25 and provide the acquired time information to the UE 200. In addition, the time management unit 130 can acquire time information of the NR (5G) system from the 5G GM and provide the acquired time information to the UE 200.

[0040] Furthermore, the time management unit 130 can receive time difference information indicating a time difference (first time difference) between a transmission timing of a reference signal (first signal) in the UE 200 and a reception timing of another reference signal (second signal) in the UE 200. In this embodiment, the time management unit 130 may constitute a receiving unit.

[0041] Specifically, the time management unit 130 can receive information from the UE 200 indicating the time difference (UE Rx-Tx time difference) between the transmission timing (transmission time) of the UL-RS in the UE 200 and the reception timing (reception time) of the DL-RS in the UE 200.

[0042] The time management unit 130 may receive the time difference information periodically, or non-periodically, for example, when a specific event occurs.

[0043] In addition, the time management unit 130 can also transmit, to the UE 200, information indicating the time difference between the reception timing of the UL-RS and the transmission timing of the DL-RS at the gNB 100 (gNB Rx-Tx time difference).

[0044] The control unit 140 controls each functional block constituting the gNB 100. In particular, in this embodiment, the control unit 140 executes control related to compensation for propagation delay in the section between the UE 200 and the gNB 100.

[0045] Specifically, when the control unit 140 receives the above-mentioned time difference information via the time management unit 130, it can acquire the propagation delay to UE200 based on a first time difference between the transmission timing of a reference signal (first signal) at UE200 and the reception timing of another reference signal (second signal) at UE200, and a second time difference between the reception timing of the first signal at gNB100 and the transmission timing of the second signal.

[0046] More specifically, the control unit 140 obtains the propagation delay based on the UE Rx-Tx time difference (first time difference) and the gNB Rx-Tx time difference (second time difference). The control unit 140 may obtain the sum of the UE Rx-Tx time difference and the gNB Rx-Tx time difference. The sum may be interpreted as the RTT.

[0047] In addition, a predefined offset value or the like may be added (or subtracted) to the sum of the UE Rx-Tx time difference and the gNB Rx-Tx time difference.

[0048] The control unit 140 may calculate the propagation delay (which may be called propagation time, etc.) between the UE 200 and the gNB 100 by dividing the total value in half ((UE Rx-Tx time difference + gNB Rx-Tx time difference) / 2). Note that the calculation of the UE Rx-Tx time difference and the gNB Rx-Tx time difference and the measurement point (reference point), etc. may follow the provisions of 3GPP TS 38.215 Chapters 5.1.30 and 5.2.3.

[0049] The control unit 140 may perform propagation delay compensation based on the calculated propagation delay in the section between the UE 200 and the gNB 100. Specifically, the control unit 140 may adjust the time information for the NR system or TSN according to the amount of propagation delay in the wireless section.

[0050] (2.2)UE200 As shown in FIG. 3, the UE 200 includes a radio communication unit 210, a reference signal processing unit 220, a time information processing unit 230, and a control unit 240.

[0051] The wireless communication unit 210 transmits and receives wireless signals conforming to NR. Specifically, the wireless communication unit 210 transmits UL signals conforming to NR and receives DL signals conforming to NR. The wireless communication unit 210 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and each of two NG-RAN nodes.

[0052] The wireless communication unit 210 also transmits and receives various channels of the physical layer, including a control channel and a data channel.

[0053] Reference signal processing unit 220 performs processing related to a reference signal. Specifically, reference signal processing unit 220 performs processing related to the UL direction, that is, the reference signal (UL-RS) transmitted by UE 200. Reference signal processing unit 120 performs processing related to the DL direction, that is, the reference signal (DL-RS) received by UE 200. Specific reference signals included in the UL-RS and DL-RS transmitted and received by UE 200 may be as described above.

[0054] The time information processing unit 230 executes processing related to the time information (5G GM standard) used in the wireless communication system 10 and the time information for TSN (TSC GM25 standard).

[0055] Specifically, the time information processing unit 230 can provide 5G GM-based time information to each functional block constituting the UE 200. In addition, the time information processing unit 230 can obtain TSC GM25-based time information from the network and provide the obtained time information to the IoT device 40.

[0056] When a time difference between the transmission timing and reception timing of a predetermined reference signal, specifically, a UE Rx-Tx time difference, exceeds a specified threshold, the time information processing unit 230 may transmit time difference information indicating the time difference to the gNB 100. In this embodiment, the time information processing unit 230 may constitute a transmission unit.

[0057] Furthermore, the time information processing unit 230 may receive time difference information indicating a time difference (first time difference) between the reception timing (t2) of the UL-RS (first signal) and the transmission timing (t3) of the DL-RS (second signal) in the gNB 100. In this embodiment, the time information processing unit 230 may constitute a receiving unit.

[0058] Specifically, the time information processing unit 230 can receive time difference information indicating the gNB Rx-Tx time difference.

[0059] The time management unit 130 may receive the time difference information periodically, or non-periodically, for example, when a specific event occurs.

[0060] The control unit 240 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 240 executes compensation for propagation delay in the section between the UE 200 and the gNB 100, and control related to time information used in the wireless communication system 10.

[0061] Specifically, the control unit 240 can obtain the time difference (UE Rx-Tx time difference) between the transmission timing (t1) of the UL-RS (first signal) and the reception timing (t4) of the DL-RS (second signal).

[0062] When the control unit 240 receives information (time difference information) indicating the gNB Rx-Tx time difference, it can obtain the propagation delay with the gNB 100 based on the gNB Rx-Tx time difference and the UE Rx-Tx time difference.

[0063] The control unit 240 obtains the propagation delay based on the UE Rx-Tx time difference and the gNB Rx-Tx time difference. Specifically, the control unit 240 may obtain the sum of the UE Rx-Tx time difference and the gNB Rx-Tx time difference. The sum may be interpreted as the RTT.

[0064] The control unit 240 may calculate the propagation delay between the UE 200 and the gNB 100 by dividing the total value in half ((UE Rx-Tx time difference + gNB Rx-Tx time difference) / 2).

[0065] Furthermore, the control unit 240 may perform propagation delay compensation based on the calculated propagation delay in the section between the UE 200 and the gNB 100. Specifically, the control unit 240 may adjust the time information for the NR system or TSN according to the amount of propagation delay in the wireless section.

[0066] (3) Operation of wireless communication system Next, a description will be given of an operation of the wireless communication system 10. Specifically, a description will be given of an operation related to propagation delay compensation using the RTT (RTT based delay compensation) between the UE 200 and the gNB 100.

[0067] (3.1) Example 1 First, the operation related to calculation and reporting of the UE Rx-Tx time difference and the gNB Rx-Tx time difference using the UL-RS and the DL-RS will be described.

[0068] The RTT based delay compensation can be performed using the UE Rx-Tx time difference and the gNB Rx-Tx time difference. The UE Rx-Tx time difference may be reported from the UE 200 to the gNB 100 according to the Long Term Evolution Positioning Protocol (LPP) or a radio resource control layer (RRC) protocol.

[0069] FIG. 4 shows an example of a calculation and reporting sequence of the UE Rx-Tx time difference and the gNB Rx-Tx time difference using the UL-RS and the DL-RS.

[0070] As shown in FIG. 4, the UE 200 transmits the UL-RS at time t1 (transmission timing), and the UL-RS is received by the gNB 100 at time t2 (reception timing).

[0071] In addition, gNB100 transmits the DL-RS to UE200 at time t3 (transmission timing), and the DL-RS is received by UE200 at time t4 (reception timing).

[0072] As described above, the types of UL-RS and DL-RS are not particularly limited. The UL-RS may include PRACH, and the DL-RS may include SS. The DL-RS may be transmitted first, and the UL-RS may be transmitted later.

[0073] The RTT and the propagation delay between UE 200 and gNB 100 may be expressed as follows:

[0074] ·RTT = t2-t1 + t4-t3 = t4-t1 + t2-t3 = (UE Rx-Tx time difference) + (gNB Rx-Tx time difference) ·Propagation delay = ((UE Rx-Tx time difference) + (gNB Rx-Tx time difference)) / 2 The UE Rx-Tx time difference (t4-t1) calculated by UE200 may be reported to gNB100 according to any of the following methods.

[0075] (Method 1): The UE 200 periodically reports the UE Rx-Tx time difference.

[0076] (Method 2): The UE 200 reports the UE Rx-Tx time difference in response to a specific event.

[0077] In this case, the event may be defined, for example, as follows:

[0078] Event X: If the propagation delay between the UE and the gNB exceeds a predetermined threshold, a Measurement Report including the measurement result of the UE Rx-Tx time difference is reported to the network.

[0079] Furthermore, the measurement report may be expressed as follows:

[0080] ·UE shall consider the entering condition for this event to be satisfied when PD-1 is fulfilled; ·UE shall consider the leaving condition for this event to be satisfied when PD-2 is fulfilled; ·Ms - Hys > Thresh + Offset PD-1 (entering condition) ·Ms + Hys > Thresh + Offset PD-2 (leaving condition) Here, Ms may denote the propagation delay between the UE and the gNB, and Hys may denote a hysteresis parameter for the event.

[0081] Thresh is a reference threshold of the event, and may be specified as PropagationDelayThreshRef by MeasConfig (see 3GPP TS38.331). Offset may indicate an offset value to PropagationDelayThreshRef to obtain an absolute threshold of the event. Also, the time until the event is triggered (timeToTrigger) may be set.

[0082] When reporting the UE Rx-Tx time difference, the UE 200 may add a Reference System Frame Number (ReferenceSFN).

[0083] (3.2) Example 2 Next, an example of the operation of RTT based delay compensation will be described. Specifically, an example of the propagation delay compensation operation triggered by UE and an example of the propagation delay compensation operation triggered by gNB will be described.

[0084] (3.2.1) UE-triggered propagation delay compensation Fig. 5 shows an example of a schematic operation sequence of RTT based delay compensation by UE trigger. As shown in Fig. 5, UE 200 acquires UE Rx-Tx time difference using UL-RS and DL-RS as described above, and reports the acquired UE Rx-Tx time difference to gNB 100 (steps 1 and 2).

[0085] As described above, gNB100 acquires the gNB Rx-Tx time difference using the UL-RS and DL-RS and calculates the propagation delay (steps 3 and 4).

[0086] The gNB 100 performs propagation delay compensation based on the calculated propagation delay (step 5). Specifically, the gNB 100 may adjust the time information for the NR system or TSN according to the amount of propagation delay in the wireless section.

[0087] In the case of such UE-triggered RTT based delay compensation, when the event described in operation example 1 is satisfied, UE200 may acquire the UE Rx-Tx time difference and transmit the acquired UE Rx-Tx time difference to gNB100 (this may be called UE event type trigger).

[0088] The gNB 100 may acquire the gNB Rx-Tx time difference when it receives the UE Rx-Tx time difference from the UE 200. Here, "when it is received" may be immediately after receiving the UE Rx-Tx time difference, or may be within a predetermined time after receiving the UE Rx-Tx time difference.

[0089] The gNB100 may calculate a propagation delay based on the UE Rx-Tx time difference and the gNB Rx-Tx time difference, and perform propagation delay compensation. Specifically, the gNB100 may pre-compensate the propagation delay in ReferenceTimeInfo, and transmit the compensated time information to the UE200 by including it in system information, specifically, SIB9 or DLInformationTransfer. The SIB9 may be broadcast information, and the DLInformationTransfer may be unicast information.

[0090] Alternatively, the gNB 100 may transmit the propagation delay together with the ReferenceTimeInfo to the UE 200. In this case, the UE 200 may perform the propagation delay compensation.

[0091] Furthermore, the above-mentioned UE Rx-Tx time difference from the UE 200 may be reported based on the UE 200 receiving an explicit instruction (e.g., a measurement request / report request) from the gNB 100. Alternatively, the UE 200 may request the gNB 100 to transmit the gNB Rx-Tx time difference by an explicit instruction. In this case, the UE 200 may calculate a propagation delay and perform propagation delay compensation after receiving the gNB Rx-Tx time difference.

[0092] In addition, in the case of such UE-triggered RTT based delay compensation, the UE 200 may periodically acquire the UE Rx-Tx time difference and transmit the acquired UE Rx-Tx time difference to the gNB 100 (this may be referred to as UE periodically triggered).

[0093] UE200 periodically reports the measurement results of the UE Rx-Tx time difference to gNB100, and when gNB100 receives the UE Rx-Tx time difference from UE200, it may acquire the gNB Rx-Tx time difference and calculate the propagation delay.

[0094] Alternatively, the gNB100 may transmit the calculated propagation delay to the UE200 using SIB9 or DLInformationTransfer, and the UE200 may adjust the time information. Note that the gNB100 may transmit the propagation delay to the UE200 only when the propagation delay exceeds a predetermined threshold, or the gNB100 may pre-compensate the propagation delay.

[0095] (3.2.2) Propagation delay compensation by gNB trigger Figure 6 shows an example of a schematic operation sequence of RTT based delay compensation triggered by gNB. As shown in Figure 6, as described above, gNB100 acquires gNB Rx-Tx time difference using UL-RS and DL-RS, and reports the acquired gNB Rx-Tx time difference to UE200 (steps 1 and 2).

[0096] As described above, UE 200 acquires the UE Rx-Tx time difference using the UL-RS and DL-RS, and calculates the propagation delay (steps 3 and 4).

[0097] The UE 200 performs propagation delay compensation based on the calculated propagation delay (step 5). Specifically, the UE 200 may adjust time information for the NR system or TSN in accordance with the amount of propagation delay in the wireless section.

[0098] In the case of such a gNB-triggered RTT based delay compensation, the gNB100 measures the gNB Rx-Tx time difference, and when the gNB Rx-Tx time difference exceeds a predetermined threshold, the gNB100 may transmit the gNB Rx-Tx time difference to the UE200 together with ReferenceTimeInfo using SIB 9 or DLInformationTransfer. Note that such transmission of the gNB Rx-Tx time difference may be interpreted as an implicit propagation delay compensation instruction to the UE200. Alternatively, the gNB100 may transmit an explicit propagation delay compensation instruction to the UE200.

[0099] The UE 200 may measure and acquire a UE Rx-Tx time difference in response to receiving the gNB Rx-Tx time difference. The UE 200 may calculate a propagation delay using the gNB Rx-Tx time difference and the UE Rx-Tx time difference, and perform propagation delay compensation.

[0100] In addition, in the case of such RTT based delay compensation by gNB trigger, the gNB 100 may periodically transmit the gNB Rx-Tx time difference together with ReferenceTimeInfo to the UE 200. Such transmission of the gNB Rx-Tx time difference may also be interpreted as an implicit propagation delay compensation instruction to the UE 200. Alternatively, the gNB 100 may transmit an explicit propagation delay compensation instruction to the UE 200.

[0101] The UE 200 may measure and acquire the UE Rx-Tx time difference in response to receiving the gNB Rx-Tx time difference. The UE 200 may calculate a propagation delay using the gNB Rx-Tx time difference and the UE Rx-Tx time difference, and perform the propagation delay compensation. Alternatively, the UE 200 may perform the propagation delay compensation only when the propagation delay exceeds a predetermined threshold.

[0102] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained. Specifically, when the UE Rx-Tx time difference exceeds a specified threshold, the UE 200 can transmit information indicating the UE Rx-Tx time difference (for example, a measurement report) to the gNB 100. When the UE 200 receives the gNB Rx-Tx time difference, the UE 200 can also acquire a propagation delay between the UE 200 and the gNB 100 based on the gNB Rx-Tx time difference and the UE Rx-Tx time difference.

[0103] In addition, when gNB100 receives the UE Rx-Tx time difference, it can obtain the propagation delay between UE200 and gNB100 based on the UE Rx-Tx time difference and the gNB Rx-Tx time difference.

[0104] Therefore, even when high-precision synchronization is required for TSN, RTT-based delay compensation can be appropriately performed, making it possible to provide highly accurate time information even when supporting TSN.

[0105] In this embodiment, the UE 200 may periodically receive the gNB Rx-Tx time difference from the gNB 100, and the gNB 100 may periodically receive the UE Rx-Tx time difference from the UE 200. This makes it easy to continue high-precision propagation delay compensation based on the RTT. On the other hand, the UE Rx-Tx time difference or the gNB Rx-Tx time difference may be transmitted in response to a predetermined event as described above. In this case, it is easy to realize timely propagation delay compensation according to the need.

[0106] (5) Other embodiments Although the embodiment has been described above, it will be apparent to those skilled in the art that the present invention is not limited to the description of the embodiment and that various modifications and improvements are possible.

[0107] For example, in the above-described embodiment, a measurement report is used to report the UE Rx-Tx time difference, but other methods, such as signaling of a higher layer (such as RRC) or signaling of a lower layer (such as uplink control information (UCI)), may be used.

[0108] Similarly, reporting of gNB Rx-Tx time difference may also use methods other than SIB 9 or DLInformationTransfer.

[0109] Furthermore, in the above-described embodiment, it is assumed that the wireless communication system 10 is connected to TSN, but the network or application scenario does not necessarily require high synchronization accuracy such as TSN.

[0110] Moreover, the block diagrams (FIGS. 2 and 3) used in the description of the above-mentioned embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by using wires, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0111] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission is called a transmitting unit or a transmitter. As described above, there is no particular limitation on the method of realization of any of these.

[0112] Furthermore, the above-mentioned gNB100 and UE200 (the devices) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 7 is a diagram showing an example of the hardware configuration of the gNB100 and UE200. As shown in Fig. 7, the gNB100 and UE200 may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0113] In the following description, the term "apparatus" may be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0114] Each functional block of the device (see FIGS. 2 and 3) is realized by any hardware element of the computer device, or a combination of the hardware elements.

[0115] In addition, each function in the device is realized by loading a specific software (program) onto hardware such as the processor 1001 and memory 1002, causing the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0116] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0117] Furthermore, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. Furthermore, the above-mentioned various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0118] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0119] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. Storage 1003 may be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0120] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0121] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0122] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0123] In addition, 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 each device.

[0124] 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), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0125] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by 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 a combination of these. Furthermore, the RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0126] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 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 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based on these. In addition, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0127] The order of the steps, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0128] In the present disclosure, a specific operation performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and other network nodes other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case in which there is one other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0129] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and may be input and output via multiple network nodes.

[0130] The input / output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input / output information may be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to another device.

[0131] The determination may be based on a value represented by a single bit (0 or 1), a Boolean (true or false) value, or a numerical comparison (e.g., comparison with a predetermined value).

[0132] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to execution. In addition, notification of specific information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).

[0133] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0134] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired and / or wireless technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0135] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0136] In addition, the terms described in this disclosure and the terms necessary 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). Also, a signal may be a message. Also, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0137] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0138] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

[0139] The names used for the above-mentioned parameters are not limiting in any way. Furthermore, the formulas using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0140] In this disclosure, terms such as "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0141] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0142] The term "cell" or "sector" refers to part or all of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within that coverage.

[0143] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0144] A mobile station may also be referred to 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 terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0145] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0146] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies below). For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0147] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0148] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a Cyclic Prefix length, a Transmission Time Interval (TTI), a number of symbols per TTI, a radio frame structure, a particular filtering operation that the transceiver performs in the frequency domain, a particular windowing operation that the transceiver performs in the time domain, etc.

[0149] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based unit of time.

[0150] A slot may include multiple minislots. Each minislot may be composed of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0151] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the minislot, and the symbol may each be referred to by a different name.

[0152] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0153] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0154] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0155] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0156] A TTI having a time length of 1 ms may be called 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 slot, etc. A TTI shorter than a normal TTI may 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, etc.

[0157] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0158] A resource block (RB) is a resource allocation unit in the time domain and the 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 the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0159] In addition, the time domain of the RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0160] One or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0161] 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.

[0162] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0163] 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.

[0164] 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. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0165] The above-mentioned structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, 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 subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0166] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." 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, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0167] The reference signal may also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0168] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0169] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0170] Any reference to an element using a designation such as "first," "second," etc., 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 way to distinguish between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0171] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term "comprising." Further, as used in this disclosure, the term "or" is not intended to be an exclusive or.

[0172] In this disclosure, where articles have been added due to translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0173] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), and the like. In addition, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to be a "judgment" or "decision." In other words, "judgment" and "decision" can include considering some action to be a "judgment" or "decision." In addition, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

[0174] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0175] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0176] 10. Wireless communication systems 20 NG-RAN 25 TSC GM 30 5GC 35 UPF 40 IoT devices 100 gNB 110 Wireless Communication Division 120 Reference signal processing unit 130 Time Management Department 140 Control section 200UE 210 Wireless Communication Department 220 Reference signal processing unit 230 Time information processing section 240 Control Unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output device 1007 Bus

Claims

1. a transmitter that transmits a measurement request to the terminal, the measurement request instructing the terminal to measure a first time difference between a transmission timing of a first signal and a reception timing of a second signal; a receiving unit that receives a measurement result including time difference information indicating the first time difference from the terminal based on reception of the measurement request; a control unit that acquires a second time difference between a reception timing of the first signal and a transmission timing of the second signal at a base station; The control unit is a base station that calculates a propagation delay to the terminal based on the first time difference and the second time difference, and performs propagation delay compensation.

2. transmitting, to the terminal, a measurement request instructing the terminal to measure time difference information indicating a first time difference between a transmission timing of a first signal and a reception timing of a second signal at the terminal; receiving, based on the reception of the measurement request, a measurement result from the terminal, the measurement result including time difference information indicating the first time difference; obtaining a second time difference between a reception timing of the first signal and a transmission timing of the second signal at a base station; A communication method for a base station comprising the step of calculating a propagation delay to the terminal based on the first time difference and the second time difference, and performing propagation delay compensation.

3. a receiving unit that receives, from a base station, a measurement request instructing the terminal to measure time difference information indicating a first time difference between a transmission timing of a first signal and a reception timing of a second signal; a transmitter configured to transmit a measurement result including time difference information indicating the first time difference to the base station based on reception of the measurement request; A terminal in which a propagation delay between the terminal and the base station is calculated by the base station based on the first time difference and a second time difference between the reception timing of the first signal at the base station and the transmission timing of the second signal, and propagation delay compensation is performed.

4. The base station is a transmitter that transmits a measurement request to the terminal, the measurement request instructing the terminal to measure a first time difference between a transmission timing of a first signal and a reception timing of a second signal; a receiving unit that receives a measurement result including time difference information indicating the first time difference from the terminal; a control unit that acquires a second time difference between a reception timing of the first signal and a transmission timing of the second signal at the base station; The terminal includes: a transmitter configured to transmit the measurement result, the measurement result including time difference information indicating the first time difference, to the base station upon receipt of the measurement request; The control unit of the base station calculates a propagation delay between the terminal and the base station based on the first time difference and the second time difference, and performs propagation delay compensation. system.

5. a receiving unit that receives, from a base station, a report message including time difference information indicating a first time difference between a reception timing of a first signal and a transmission timing of a second signal at the base station; a control unit that acquires a second time difference between a transmission timing of the first signal and a reception timing of the second signal in a terminal; When the control unit receives the first time difference, the control unit calculates a propagation delay between the base station and the base station based on the first time difference and the second time difference, and performs propagation delay compensation. Terminal.

6. receiving, from a base station, a report message including time difference information indicating a first time difference between a reception timing of a first signal and a transmission timing of a second signal at the base station; acquiring a second time difference between a transmission timing of the first signal and a reception timing of the second signal at a terminal; When the first time difference is received, a propagation delay between the base station and the mobile station is calculated based on the first time difference and the second time difference, and a propagation delay compensation is performed. The communication method of the device.

7. The base station is a transmitting unit configured to transmit, to a terminal, a report message including time difference information indicating a first time difference between a reception timing of a first signal and a transmission timing of a second signal at the base station; The terminal includes: a receiving unit for receiving the report message from the base station; a control unit that acquires a second time difference between a transmission timing of the first signal and a reception timing of the second signal in the terminal; When the control unit receives the first time difference, the control unit calculates a propagation delay between the base station and the base station based on the first time difference and the second time difference, and performs propagation delay compensation. system.

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