wireless base stations

Abstract

The gNB (100) transmits and receives a predetermined message or response, and in response to receiving the message or response, obtains a propagation delay between the gNB and the UE (200), and performs propagation delay compensation. The propagation delay compensation is performed in the DU (120) on the UE (200) side or the CU (110) on the network side.

Description

Technical Field

[0001] The present invention relates to a wireless base station that supports compensation of propagation delay with a terminal. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized the fifth-generation mobile communication system (also known as 5G, New Radio (NR), or Next Generation (NG)), and is also promoting the standardization of the next generation known as Beyond 5G, 5G Evolution, or 6G.

[0003] 3GPP Release 17 supports the Industrial Internet of Things (IIoT) and URLLC (Ultra-Reliable and Low Latency Communications), aiming to achieve further high-precision synchronization between wireless base stations (gNBs) and terminals (User Equipment, UEs) (Non-Patent Document 1).

[0004] For example, in use cases such as smart grids, higher synchronization accuracy is required in a wider service area (Non-Patent Document 2), so compensation for propagation delay in the wireless section between the UE and the gNB is essential.

[0005] In this case where higher synchronization accuracy is required in a wider service area, it is possible to consider applying CU-DU split gNB deployment, which configures the CU (Central Unit) and DU (Distributed Unit) of the gNB in a separate manner, and simultaneously perform propagation delay compensation between UE and gNB (specifically, between UE and DU).

[0006] Prior art literature

[0007] Non-patent literature

[0008] Non-Patent Document 1: "Enhanced Industrial Internet of Things (IoT) and ultra-reliable and low latency communication (URLLC) support for NR," RP-201310, 3GPP RAN Meeting #88e, July 2020

[0009] Non-Patent Document 2: 3GPP TS 22.104 V17.3.0, 3rd Generation Partnership Project; Technical Specification Group Services and System Aspects; Service requirements for cyber-physical control applications in vertical domains; Stage 1 (Release 17), 3GPP, July 2020 Summary of the Invention

[0010] However, according to the current 3GPP standard (Release 16), there is a problem that the CU and DU of the wireless base station find it difficult to properly collaborate to perform propagation delay compensation between UE and gNB.

[0011] Therefore, the following disclosure has been made in view of the above circumstances, and an object of the disclosure is to provide a wireless base station capable of meeting the requirements for high synchronization accuracy in a wide service area while achieving propagation delay compensation in a wireless section with a terminal (UE).

[0012] One embodiment of the present disclosure provides a wireless base station (gNB 100), which includes: a transceiver unit (e.g., a message transceiver unit 117) that sends and receives a specified message or response; and a control unit (e.g., a delay compensation control unit 115) that obtains a propagation delay between the terminal (UE 200) and the terminal in response to reception of the message or response, and performs propagation delay compensation, wherein the propagation delay compensation is performed in a communication unit (DU 120) on the terminal side or a communication unit (CU 110) on the network side.

[0013] One embodiment of the present disclosure provides a wireless base station (gNB 100), which includes: a transceiver unit (a wireless transmitting unit 121 and a wireless receiving unit 123) that transmits and receives wireless signals; and a control unit (a delay compensation control unit 125) that obtains a propagation delay between the terminal (UE 200) and the terminal based on a time difference between reception and transmission of the wireless signal, and performs propagation delay compensation, wherein the propagation delay compensation is performed in a communication unit (DU 120) on the terminal side.

[0014] One embodiment of the present disclosure provides a wireless base station (gNB 100), which includes: a receiving unit (message transceiver unit 128) that receives a control message of time information, wherein the control message of the time information includes identification information of a terminal (UE 200); and a sending unit (message transceiver unit 128) that sends the time information adjusted according to a propagation delay of the terminal associated with the identification information.

[0015] One embodiment of the present disclosure provides a wireless base station (gNB 100), which includes: a receiving unit (message transceiver unit 128), which receives a control message of time information, wherein the control message of the time information includes identification information of a terminal (UE 200); and a sending unit (message transceiver unit 128), which sends a response message including compensation information, wherein the compensation information indicates whether propagation delay compensation has been performed for the terminal associated with the identification information.

[0016] One embodiment of the present disclosure provides a radio base station (gNB 100), including:

[0017] A sending unit (e.g., a message transceiver unit 117) that sends system information or a message related to a downlink including time information used within the system; and a control unit (e.g., a delay compensation control unit 115) that indicates whether to indicate to the terminal the propagation delay compensation between the terminal and the terminal and includes it in the system information or the message. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram schematically illustrating the overall configuration of the wireless communication system 10 .

[0019] Figure 2 1 is a diagram showing an example of TSN support by the wireless communication system 10 .

[0020] Figure 3 This is a functional block diagram of CU 110.

[0021] Figure 4 This is the functional block structure diagram of DU 120.

[0022] Figure 5 This is a diagram showing the timing of propagation delay compensation according to Operation Example 1-1.

[0023] Figure 6 This is a diagram showing the timing of propagation delay compensation according to Operation Example 1-2.

[0024] Figure 7 This is a diagram showing the timing of propagation delay compensation according to Operation Example 1-3.

[0025] Figure 8 This is a diagram showing the timing of propagation delay compensation according to Operation Example 1-4.

[0026] Figure 9 This is a diagram showing the timing of propagation delay compensation according to Operation Example 2.

[0027] Figure 10 This is a diagram showing the timing of propagation delay compensation according to Operation Example 3.

[0028] Figure 11 This is a diagram showing a timing chart (part 1) of propagation delay compensation according to Operation Example 4.

[0029] Figure 12 This is a diagram showing a timing chart (part 2) of propagation delay compensation according to Operation Example 4.

[0030] Figure 13 This is a diagram showing a structural example of information elements included in the ReportingRequest Type of the REFERENCE TIME INFORMATION REPORTING CONTROL.

[0031] Figure 14 This is a diagram showing a structural example of information elements included in the REFERENCE TIME INFORMATION REPORT.

[0032] Figure 15 This is a diagram showing a structural example of information elements included in Time Reference Information of a REFERENCE TIME INFORMATION REPORT.

[0033] Figure 16 This is a diagram showing a structural example of DLInformationTransfer msg.

[0034] Figure 17 This is a diagram showing a structural example of SIB9.

[0035] Figure 18 1 is a diagram showing an example of the hardware configuration of the CU 110 and the DU 120 . DETAILED DESCRIPTION

[0036] Hereinafter, the embodiment will be described with reference to the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and their description will be omitted as appropriate.

[0037] (1) Overall schematic structure of wireless communication system

[0038] Figure 1 This figure is a schematic diagram of the overall structure of the wireless communication system 10 involved in this embodiment. The wireless communication system 10 is a wireless communication system that complies with 5G New Radio (NR) and includes a next-generation radio access network 20 (NG-RAN 20) and a user equipment 200 (UE 200).

[0039] In addition, the wireless communication system 10 may be a wireless communication system that complies with a method called Beyond 5G, 5G Evolution, or 6G.

[0040] 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 and UEs is not limited to Figure 1 Example shown.

[0041] The NG-RAN 20 actually includes multiple NG-RAN nodes, specifically, multiple gNBs (or ng-eNBs), which are connected to the 5G core network, namely the 5GC 30. The NG-RAN 20 and 5GC 30 can be simply referred to as the "network."

[0042] The 5GC 30 may be provided with a user plane function (UPF 35), which provides user plane functions included in the 5G system architecture. The UPF 35 can be connected to the TSN Grandmaster Clock 25 (TSC GM 25), which provides time information used in the Time Sensitive Network (TSN), via a specific interface. The TSC GM 25 can provide highly accurate time information (date and time) to the IoT device 40 connected to the UE 200 via the NG-RAN 20, etc. The IoT device 40 may also be referred to as a terminal station, etc.

[0043] For example, TSN can be used as a network for the Industrial Internet of Things (IIoT). TSN can be configured as a network separate from the NR (5G) system (i.e., NG-RAN 20 and 5GC 30) and can synchronize with timing generated by an independent clock.

[0044] TSN can include networks associated with services requiring high synchronization accuracy in a wide service area, such as smart grids.

[0045] gNB 100 is a NR-compliant radio base station that performs NR-compliant wireless communications with UE 200. gNB 100 and UE 200 support Massive MIMO, which generates beams with higher directivity by controlling radio signals transmitted from multiple antenna elements; Carrier Aggregation (CA), which bundles and uses multiple Component Carriers (CCs); and Dual Connectivity (DC), which allows simultaneous communication between the UE and multiple NG-RAN nodes.

[0046] The IoT device 40 may be a communication device (terminal) included in TSN (for example, IIoT) and may be synchronized with the timing (time information) within TSN.

[0047] Therefore, in this embodiment, in the NR (5G) system, it is possible to connect the TSC GM 25 and the IoT device 40, and provide a mechanism for compensating for the propagation delay between the UE 200 and the gNB 100.

[0048] Figure 2 FIG. 1 shows an example of TSN support based on the wireless communication system 10. Figure 2 As shown, gNB 100 may be composed of a Central Unit 110 (hereinafter referred to as CU 110) and a Distributed Unit 120 (hereinafter referred to as DU 120). Multiple DUs 120 may be connected to CU 110. The connection between CU 110 and DU 120 may be wired (e.g., Ethernet (registered trademark)). Alternatively, the connection between CU 110 and DU 120 may be wireless.

[0049] IoT devices 40 connected to UE 200 can operate in synchronization with the TSN time information provided by TSC GM 25 (see the clock icon in the figure). Meanwhile, within the NR (5G) system, the 5G Grand Master Clock (5G GM) provides time information used within the system. The UPF 35, CU 110, DU 120, and UE 200 can operate in synchronization with the time information from the 5G GM.

[0050] In situations where high synchronization accuracy is required in a wide service area, such as in smart grids, the wireless communication system 10 can cover a wide service area (e.g., up to 20 km wide) by applying a CU-DU split gNB deployment in which a CU 110 and multiple DUs 120 are geographically separated. 2 ).

[0051] Furthermore, to achieve higher synchronization accuracy (e.g., less than 1 μs), the propagation delay between UE 200 and gNB 100 can be compensated. Specifically, in wireless communication system 10, the propagation delay in the wireless section between UE 200 and DU 120 connected to UE 200 can be compensated. Propagation delay compensation can be interpreted as adjusting the TSN time information based on the propagation delay in the wireless section. As a result, each IoT device 40 can operate in synchronization with the TSN time information. More specifically, it can be interpreted as adjusting the time information obtained by subtracting the propagation delay between UE 200 and gNB 100 (DU 120) (in the wireless section) from the TSN time information.

[0052] Alternatively, propagation delay compensation can be interpreted as adjusting the time information obtained by subtracting the propagation delay between UE 200 and gNB100 (DU 120) (wireless interval) from the time information of 5G GM, or it can be interpreted as if correct synchronization is maintained within the 5G system, the 5G system plays the role of a TSN bridge, and TSN IoT devices can operate in synchronization with the time used by TSN.

[0053] (2) Functional block structure of wireless communication system

[0054] Next, the functional block structure of the wireless communication system 10 is described. Specifically, the functional block structure of the CU 110 and DU 120 that constitute the gNB 100 is described.

[0055] (2.1)CU 110

[0056] Figure 3 This is the functional block diagram of CU 110. Figure 3 As shown, the CU 110 includes a network connection unit 111 , a DU connection unit 113 , a delay compensation control unit 115 , a message transceiver unit 117 , and a system information transmitter 119 .

[0057] The network connection unit 111 provides a communication interface with the network (specifically, other communication nodes constituting the NG-RAN 20) and a communication interface with the communication nodes constituting the 5GC 30. For example, the communication interface may include N2, N3, etc.

[0058] The DU connection unit 113 provides a communication interface with the DU 120. For example, the communication interface may include F1, etc. Specifically, the DU connection unit 113 can provide a communication interface (such as Ethernet (registered trademark)) for connecting multiple DUs 120 in a wired manner.

[0059] The delay compensation control unit 115 performs control related to compensation of the propagation delay between the UE 200 and the gNB 100. In this embodiment, the delay compensation control unit 115 may constitute a control unit.

[0060] Specifically, the delay compensation control unit 115 can obtain the propagation delay with the UE 200 based on a predetermined message transmitted or received by the message transmitting and receiving unit 117 .

[0061] For example, delay compensation control unit 115 can calculate the propagation delay between UE 200 and gNB 100 (specifically, DU 120) based on the value of the gNB Rx-Tx time difference transmitted from DU 120. The gNB Rx-Tx time difference can be interpreted as the difference (time difference) between the reception timing and transmission timing of a specified subframe in gNB 100 (DU 120). The gNB Rx-Tx time difference is specified in 3GPP TS 38.215, Section 5.2.3. The gNB Rx-Tx time difference will be described further below.

[0062] This allows the delay compensation control unit 115 to determine the propagation delay with the UE 200 based on the reception of messages or responses such as the gNB Rx-Tx time difference, and to perform propagation delay compensation. Furthermore, as described below, propagation delay compensation can be performed by the DU 120, a communication unit on the UE 200 side, or by the CU 110, a communication unit on the network side.

[0063] Furthermore, the delay compensation control unit 115 can include in system information or a downlink-related message (specifically, a DLInformationTransfer msg.) an instruction to the UE 200 regarding whether propagation delay compensation for each UE 200 is required. As described below, system information (SIB) can be transmitted (broadcasted) to the UE 200 by the system information transmitting unit 119. The UE 200 can perform propagation delay compensation based on this system information or downlink-related message.

[0064] The message transceiver 117 transmits and receives a predetermined message or response. In this embodiment, the message transceiver 117 may constitute a transceiver.

[0065] Specifically, the messaging unit 117 can send a Positioning Measurement Request to the DU 120 and receive a Positioning Measurement Response (POSITIONING MEASUREMENT RESPONSE) from the DU 120. The Positioning Measurement Response can include the gNB Rx-Tx time difference. The Positioning Measurement Request and Positioning Measurement Response are specified in 3GPP TS 38.473.

[0066] Furthermore, the message transceiver 117 can send a REFERENCE TIME INFORMATION REPORTING CONTROL message, a type of F1 message specified in 3GPP TS 38.473, to the DU 120, and receive a REFERENCE TIME INFORMATION REPORT message, which is a response to the REFERENCE TIME INFORMATION REPORTING CONTROL message, from the DU 120. The REFERENCE TIME INFORMATION REPORTING CONTROL message may include a Propagation Delay Compensation Request message instructing the DU 120 to perform propagation delay compensation.

[0067] Furthermore, the message transceiver 117 can transmit a downlink-related message (specifically, a DLInformationTransfer msg., which is a unicast message) that can include time information to the UE 200 via the DU 120. In this embodiment, the message transceiver 117 can constitute a transmitter.

[0068] Note that these messages are merely examples, and different messages may be used as long as they are messages transmitted and received between the CU 110 to the DU 120 .

[0069] The system information transmitter 119 broadcasts system information within the cell formed by the gNB 100. This system information can be called a system information block (SIB). There are many types of SIBs, but in this embodiment, the system information transmitter 119 can broadcast SIB9, which includes an information element (IE) called referenceTimeInfo-r16, within the cell via the DU 120. referenceTimeInfo-r16 indicates the internal system clock (also called time or timing) of the NR (5G).

[0070] That is, the system information transmitting unit 119 can transmit the system information including the time information used in the wireless communication system 10. In this embodiment, the system information transmitting unit 119 can constitute a transmitting unit.

[0071] (2.2)DU 120

[0072] Figure 4 This is the functional block diagram of DU 120. Figure 4 As shown, the DU 120 includes a wireless transmission unit 121 , a wireless reception unit 123 , a CU connection unit 124 , a delay compensation control unit 125 , an RA processing unit 126 , a time information processing unit 127 , and a message transceiver unit 128 .

[0073] The wireless transmission unit 121 transmits a wireless signal conforming to NR toward the UE 200. The wireless reception unit 123 receives the wireless signal conforming to NR transmitted from the UE 200. In this embodiment, the wireless transmission unit 121 and the wireless reception unit 123 may constitute a transmission and reception unit that transmits and receives wireless signals.

[0074] The CU connection unit 124 provides a communication interface with the CU 110. As described above, the communication interface may include F1, etc. The CU connection unit 124 can provide a communication interface for a wired connection with the CU 110.

[0075] Similar to the delay compensation control unit 115 of the CU 110, the delay compensation control unit 125 performs control related to "compensation for the propagation delay between the UE 200 and the gNB 100." In this embodiment, the delay compensation control unit 125 may constitute a control unit.

[0076] Specifically, delay compensation control unit 125 can calculate the propagation delay with UE 200 based on the time difference between receiving and transmitting a radio signal, and perform propagation delay compensation. The time difference between receiving and transmitting a radio signal can be the gNB Rx-Tx time difference described above. A radio signal can be interpreted as a radio frame, subframe, time slot, or symbol. Alternatively, a radio signal can be replaced by a message from a higher layer (e.g., a radio resource control (RRC) layer).

[0077] Furthermore, propagation delay compensation can be implemented by the same operation as that of the CU 110. That is, the delay compensation control unit 125 can obtain the propagation delay with the UE 200 based on reception of a message or a response and perform propagation delay compensation.

[0078] Specifically, the delay compensation control unit 125 may perform propagation delay compensation based on the reception of a random access preamble (msg.1) in a random access procedure (RA procedure) from the UE 200. The execution based on reception may be performed simultaneously with the reception or within a certain time after the reception.

[0079] More specifically, upon receiving the random access preamble (msg. 1), the delay compensation control unit 125 may calculate a timing advance (TA) command and a UE-specific propagation delay for each UE 200 to perform propagation delay compensation.

[0080] Furthermore, the delay compensation control unit 125 can perform propagation delay compensation based on reception of a REFERENCE TIME INFORMATION REPORTING CONTROL (control message) transmitted from the CU 110. The purpose of the REFERENCE TIME INFORMATION REPORTING CONTROL is to instruct the DU 120 to transmit the requested correct time reference information to the CU 110.

[0081] In this embodiment, the REFERENCE TIME INFORMATION REPORTING CONTROL may include an information element (IE) that instructs the DU 120 to perform propagation delay compensation. This IE may be called, for example, a Propagation Delay Compensation Request.

[0082] Therefore, in this embodiment, propagation delay compensation can be performed in the communication unit on the UE 200 side, that is, the DU 120.

[0083] Furthermore, the delay compensation control unit 125 can include in the system information (SIB9) whether or not it is necessary to instruct the UE 200 to perform propagation delay compensation with each UE 200 .

[0084] The RA processing unit 126 performs processing related to the RA procedure with the UE 200. Specifically, the RA processing unit 126 can support the contention-based RA procedure (CBRA) and the contention-free RA procedure (CFRA). In addition, the RA processing unit 126 can support the 4-step and 2-step RA procedures.

[0085] RA processing unit 126 can perform RA procedure based on random access preamble (msg.1) received by message transceiver unit 128 from UE 200. RA procedure may include sending random access response (msg.2) to UE 200, receiving scheduled transmission (msg.3), and sending contention resolution (msg.4).

[0086] The time information processing unit 127 performs processing related to the time information (5G GM standard) used in the wireless communication system 10 and the time information for TSN (TSC GM 25 standard).

[0087] Specifically, the time information processing unit 127 can adjust the time information for TSN based on the propagation delay with the UE 200. The UE 200 is associated with the identification information of the UE 200 (which can be called the RAN UE ID) included in the REFERENCE TIME INFORMATION REPORTING CONTROL. Specifically, as described above, it can be interpreted that the adjustment is to the time information obtained by subtracting the propagation delay from the time information for TSN.

[0088] The message transceiver 128 transmits and receives a predetermined message or response. In this embodiment, the message transceiver 128 may constitute a transceiver.

[0089] Specifically, the message transceiver unit 128 can receive messages related to the RA procedure, and more specifically, can receive a random access preamble (msg.1) and the like.

[0090] In addition, the message transceiver unit 128 may send a POSITIONING MEASUREMENT RESPONSE including the value of the gNBRx-Tx time difference obtained by the delay compensation control unit 125 to the CU 110 .

[0091] The message transceiver unit 128 can also receive control messages for time information. In this embodiment, the message transceiver unit 128 can constitute a receiving unit. Specifically, the message transceiver unit 128 can receive a reference time information reporting control message from the CU 110. The reference time information reporting control message can include a RAN UE ID as identification information that can uniquely identify each UE 200. Furthermore, as long as the identification information can uniquely identify each UE 200, it is not limited to the RAN UE ID; other IDs can also be used.

[0092] The message transceiver 128 can receive a control message (REFERENCE TIME INFORMATION REPORTING CONTROL) including time information of the identification information (RAN UE ID) of the UE 200 .

[0093] Furthermore, the message transceiver 128 can transmit the time information adjusted by the time information processing unit 127 to the CU 110. Specifically, the message transceiver 128 can transmit the time information adjusted based on the propagation delay between the UE 200 associated with a specific RAN UE ID. In this embodiment, the message transceiver 128 can constitute the transmitting unit. This time information can be included in the REFERENCE TIME INFORMATION REPORT message, which is a response message to the REFERENCE TIME INFORMATION REPORTING CONTROL.

[0094] Furthermore, the message transceiver 128 can transmit a response message (REFERENCE TIME INFORMATION REPORT) including compensation information indicating whether propagation delay compensation has been performed with respect to the UE 200 associated with the specific RAN UE ID.

[0095] Specifically, the message transceiver 128 can send a REFERENCETIME INFORMATION REPORT containing an information element (IE) of compensation information. The IE may be named "Propagation delay compensation needed" or "Propagation delay compensation completed."

[0096] Furthermore, the message transceiver 128 can transmit (relay) the system information (SIB9) and DLInformationTransfer msg. transmitted from the CU 110 to the UE 200 .

[0097] (3) Operation of wireless communication system

[0098] Next, the operation of the wireless communication system 10 is described. Specifically, the operation related to propagation delay compensation in CU-DU split gNB deployment is described.

[0099] (3.1) Prerequisites

[0100] Table 1 shows the content of the Clock synchronisation service performance requirements specified in 3GPP TS 22.104 Chapter 5.6.2.

[0101] [Table 1]

[0102]

[0103] As shown in Table 1, the synchronization requirements vary depending on the application scenario. In use cases such as smart grids (see the underlined part), higher synchronization accuracy is required in a wider service area, so wireless propagation delay compensation between UE 200 and gNB 100 is essential.

[0104] Therefore, in this embodiment, a CU-DU split gNB deployment is applied in which a CU 110 and multiple DUs 120 are configured in a geographically separated manner. This enables coverage of a wider service area (up to 20 km wide). 2 ).

[0105] (3.2)Topic

[0106] In order to apply CU-DU split gNB deployment while meeting high synchronization accuracy, it is particularly important to compensate for the propagation delay in the wireless section between UE200 and DU120. However, how CU110 and multiple DU120 can cooperate to appropriately compensate for the propagation delay in the wireless section with each of the multiple UE200 becomes a problem.

[0107] Specifically, it is considered that there are the following problems.

[0108] (Issue 1): When wireless propagation delay compensation is performed by the network (gNB 100), it is unclear whether the CU 110 or the DU 120 performs the compensation, which may result in double compensation or no compensation.

[0109] (Issue 2): Because the REFERENCE TIME INFORMATION REPORTING CONTROL and REFERENCE TIME INFORMATION REPORT F1 messages specified in 3GPP TS 38.473 are non-UE-associated messages, when propagation delay compensation is performed on the network side, the time information obtained by subtracting the propagation delay in the wireless section from the DU 120 cannot be reported to the CU 110 for each UE 200.

[0110] (Issue 3): In the F1 interface specified in 3GPP TS 38.473, CU 110 requests time reference information (Time Reference Information) from DU 120, and there is signaling for DU 120 to report Time Reference Information (also called Reference Time Information) to CU 110. However, it is not clear whether the time information reported from DU 120 to CU 110 is compensated for propagation delay, which may result in double compensation or no compensation.

[0111] (Issue 4): When instructing UE 200 to perform propagation delay compensation, it is unclear whether the CU 110 or the DU 120 should perform the instruction. This may result in duplicate instructions or no instruction at all.

[0112] (3.3) Action example

[0113] An operation example that can solve the above-mentioned problems 1 to 4 will be described below.

[0114] (3.3.1) Action Example 1

[0115] This operation example corresponds to Problem 1. In other words, it is not clear whether the CU 110 or the DU 120 performs propagation delay compensation, which may result in double compensation or no compensation.

[0116] Specifically, this problem can be solved by any one of Operation Examples 1-1 to 1-4. In Operation Examples 1-1 to 1-4, either the CU 110 or the DU 120 reliably performs propagation delay compensation.

[0117] (3.3.1.1) Action Example 1-1

[0118] In this operational example, DU 120 performs propagation delay compensation. Figure 5 The timing of propagation delay compensation according to Operation Example 1-1 is shown.

[0119] like Figure 5 As shown, UE 200 starts a random access procedure (RA procedure) with gNB 100 (DU 120), thereby sending a random access preamble (msg.1) to DU 120 (S10).

[0120] Upon receiving the random access preamble, DU 120 calculates the Timing Advance (TA) command and simultaneously calculates the UE 200-specific propagation delay (UE-specific propagation delay) (which can be replaced with "acquire," the same applies hereinafter) (S20). The calculation of the UE-specific propagation delay does not necessarily have to be performed simultaneously with the calculation of the TA command (TA value).

[0121] The DU 120 sends a random access response including a TA command to the UE 200 (S30). In addition, the UE 200 and the DU 120 may continue the RA process after the random access response.

[0122] DU 120 may perform propagation delay compensation based on the calculated UE-specific propagation delay (S40). Specifically, DU 120 may calculate the time information obtained by subtracting the UE-specific propagation delay and adjust the time information used for TSN or the time information used for the 5G system (5G GM).

[0123] (3.3.1.2) Action Example 1-2

[0124] In this operation example, the DU 120 also performs propagation delay compensation. Figure 6 The following shows the timing of propagation delay compensation according to Operation Example 1-2. Hereinafter, descriptions of the same parts as those in Operation Example 1-1 will be omitted as appropriate.

[0125] like Figure 6As shown, UE 200 and DU 120 may establish an RRC layer connection and maintain the RRC layer connection state (S110). However, as long as the NB Rx-Tx time difference can be measured, it is not necessary to establish an RRC layer connection.

[0126] DU 120 measures the gNB Rx-Tx time difference (S120). As described above, the gNB Rx-Tx time difference is specified in 3GPP TS 38.215, Section 5.2.3, and can be interpreted as the difference (time difference) between the receive timing and the transmit timing of the subframe specified by DU 120.

[0127] Specifically, the gNB Rx-Tx time difference can be defined as (T gNB-RX -T gNB-TX ). Among them, T gNB-RX It is the reception timing of the positioning node (DU 120) of the uplink subframe #i including the Sounding Reference Signal (SRS) associated with the UE 200, and can be defined by the path detected first within the time.

[0128] T gNB-TX It is the transmission timing of the positioning node of the downlink subframe #j that is closest in time to the subframe #i received from the DU 120.

[0129] DU 120 calculates the UE-specific propagation delay between UE 200 and DU 120 based on the calculated gNB Rx-Tx time difference ( S130 ).

[0130] The DU 120 performs propagation delay compensation according to the calculated UE-specific propagation delay (S140).

[0131] (3.3.1.3) Action Example 1-3

[0132] In this operation example, the DU 120 also performs propagation delay compensation. Figure 7 The timing of propagation delay compensation according to Operation Example 1-3 is shown.

[0133] like Figure 7As shown, the CU 110 sends a REFERENCE TIME INFORMATION REPORTING CONTROL message (S210), which is a type of F1 message, to the DU 120. The REFERENCE TIME INFORMATION REPORTING CONTROL message includes a Propagation delay compensation request instructing the DU 120 to perform propagation delay compensation.

[0134] Figure 13 This shows an example of the structure of the information elements included in the ReportingRequest Type of the REFERENCE TIME INFORMATION REPORTING CONTROL. Figure 13 As shown, the Reporting Request Type can include a Propagation delay compensation request.

[0135] The DU 120 calculates the propagation delay (UE-specific propagation delay) between the UE 200 and the DU 120 according to the Propagation delay compensation request included in the REFERENCE TIME INFORMATION REPORTING CONTROL ( S220 ).

[0136] The DU 120 performs propagation delay compensation according to the calculated UE-specific propagation delay (S230).

[0137] (3.3.1.4) Action Example 1-4

[0138] In this operation example, the CU 110 performs propagation delay compensation. Figure 8 The timing of propagation delay compensation according to Operation Example 1-4 is shown.

[0139] like Figure 8 As shown, CU 110 sends a POSITIONING MEASUREMENT REQUEST to DU 120 (S310). The POSITIONING MEASUREMENT REQUEST may be specified in a Positioning Measurement procedure for exchanging positioning information of a node.

[0140] DU 120 measures the gNB Rx-Tx time difference upon receiving the POSITIONING MEASUREMENT REQUEST ( S320 ).

[0141] DU 120 returns a POSITIONING MEASUREMENT RESPONSE including the measured gNB Rx-Tx time difference to CU 110 ( S330 ).

[0142] CU 110 calculates the UE-specific propagation delay between UE 200 and DU 120 based on the gNB Rx-Tx time difference received from DU 120 ( S340 ).

[0143] The CU 110 performs propagation delay compensation according to the calculated UE-specific propagation delay ( S350 ).

[0144] In addition, DU 120 may indicate that propagation delay compensation is needed in CU 110 when sending a REFERENCE TIME INFORMATION REPORT to CU 110. Alternatively, DU 120 may calculate a TA command upon receiving a random access preamble (msg.1), calculate a UE-specific propagation delay for UE 200, and send the UE-specific propagation delay to CU 110.

[0145] (3.3.2) Action Example 2

[0146] This operation example corresponds to Problem 2. That is, since REFERENCE TIME INFORMATION REPORTING CONTROL and REFERENCE TIME INFORMATION REPORT are non-UE associated msgs, time information obtained by subtracting the propagation delay in the wireless section cannot be reported from DU 120 to CU 110 for each UE 200 .

[0147] In this operation example, in order to solve this problem, the REFERENCE TIME INFORMATION REPORTING CONTROL and / or REFERENCE TIME INFORMATION REPORT associated with the RAN UE ID is used.

[0148] Figure 9 FIG. 2 shows the timing of propagation delay compensation in operation example 2. Figure 9 As shown, CU 110 transmits REFERENCE TIME INFORMATION REPORTING CONTROL (S410). This REFERENCE TIME INFORMATION REPORTING CONTROL includes the RAN UE ID of UE 200, which is the target of propagation delay compensation. As described above, the RAN UE ID is specified in 3GPP TS38.473 and the like.

[0149] DU 120 identifies the target UE 200 based on the RANUE ID included in the REFERENCE TIME INFORMATION REPORTING CONTROL and calculates the time information (e.g., time information for TSN) used by the identified UE 200 (S420). Specifically, DU 120 calculates the time information by subtracting the propagation delay in the wireless section with the UE 200.

[0150] The DU 120 reports the calculated time information to the CU 110 via a REFERENCE TIME INFORMATION REPORT (S430). The REFERENCE TIME INFORMATION REPORT includes the RAN UE ID of the UE 200.

[0151] Figure 14 The following shows an example of the structure of the information elements included in the REFERENCE TIME INFORMATION REPORT. Figure 14As shown, REFERENCE TIME INFORMATION REPORT may include RAN UE ID, time reference information per UE, and propagation delay compensation needed. Propagation delay compensation needed indicates that propagation delay compensation is required for the UE 200 in the CU 110. In addition, REFERENCE TIME INFORMATION REPORTING CONTROL may also include information elements such as RAN UE ID.

[0152] CU 110 performs propagation delay compensation based on the received time information (S440). Specifically, CU 110 calculates the UE specific propagation delay of UE 200, which is the target of propagation delay compensation, based on the received time information, and performs propagation delay compensation based on the calculated UE specific propagation delay.

[0153] (3.3.3) Action Example 3

[0154] This example operation corresponds to Problem 3. Specifically, there is signaling for reporting Time Reference Information from DU 120 to CU 110, but it is unclear whether the time information reported from DU 120 to CU 110 is compensated for propagation delay, which may result in double compensation or no compensation.

[0155] In this operation example, in order to solve this problem, the CU 110 is explicitly notified that the DU 120 has performed propagation delay compensation.

[0156] Figure 10 FIG. 3 shows the timing of propagation delay compensation in operation example 3. Figure 10 As shown, CU 110 sends REFERENCE TIME INFORMATION REPORTING CONTROL (S510). Similar to Action Example 2, this REFERENCE TIME INFORMATION REPORTING CONTROL may include the RAN UE ID of UE 200, which is the target of propagation delay compensation.

[0157] DU 120 identifies the target UE 200 based on the RANUE ID included in the REFERENCE TIME INFORMATION REPORTING CONTROL and calculates the time information (e.g., time information for TSN) used by the identified UE 200 (S520). Specifically, as in Example 2, DU 120 calculates the time information by subtracting the propagation delay in the wireless section with the UE 200.

[0158] DU 120 performs propagation delay compensation based on the calculated time information (S530). Specifically, DU 120 calculates the UE-specific propagation delay of UE 200, which is the target of propagation delay compensation, based on the calculated time information, and performs propagation delay compensation based on the calculated UE-specific propagation delay.

[0159] The DU 120 reports the calculated time information to the CU 110 via a REFERENCE TIME INFORMATION REPORT (S540). The REFERENCE TIME INFORMATION REPORT may include the RAN UE ID of the UE 200 and "Propagation delay compensation completed."

[0160] Figure 15 The following shows an example of the structure of the information elements included in the Time Reference Information of the REFERENCE TIME INFORMATION REPORT. Figure 15 As shown, the Time Reference Information may include Propagation delay compensation completed, which indicates that the DU 120 has performed propagation delay compensation for the UE 200.

[0161] (3.3.4) Action Example 4

[0162] This action example corresponds to Topic 4. That is, when the network (specifically, gNB 100) instructs UE 200 to perform propagation delay compensation, it is unclear whether CU 110 or DU 120 performs the instruction, which may result in duplicate instructions or no instructions.

[0163] In this operation example, to solve this problem, a mechanism is introduced that requires CU 110 or DU 120 to instruct UE 200 on propagation delay compensation (specifically, it can indicate to UE 200 that propagation delay compensation needed or propagation delay compensation completed).

[0164] Figure 11 The timing of propagation delay compensation in operation example 4 (part 1) is shown. Figure 11 As shown, CU 110 determines a method for compensating for propagation delay in the wireless section between UE 200 and gNB 100 (DU 120) (S610). Specifically, CU 110 determines to perform propagation delay compensation in UE 200.

[0165] The CU 110 determines a propagation delay compensation instruction to the UE 200 based on the determined propagation delay compensation method ( S620 ).

[0166] CU 110 transmits system information or a message including an indication of propagation delay compensation for UE 200 to UE 200 via DU 120 (S630). Specifically, CU 110 transmits system information (SIB9) including referenceTimeInfo-r16 and propagation delay compensation needed, or a DLInformationTransfer message including referenceTimeInfo-r16 and propagation delay compensation needed to UE 200.

[0167] Figure 12 The following shows the timing of propagation delay compensation according to Operation Example 4 (Part 2). Figure 11 In the CU 110, the propagation delay compensation method is determined, but in Figure 12 In the timing of , the DU 120 determines the compensation method for the propagation delay.

[0168] like Figure 12 As shown, CU 110 sends system information (SIB9) (S710). SIB9 includes referenceTimeInfo-r16, but does not include Propagation delay compensation needed.

[0169] DU 120 determines a method for compensating for propagation delay in the wireless section between UE 200 and gNB 100 (DU 120) (S720). Specifically, DU 120 determines whether to perform propagation delay compensation on UE 200.

[0170] The DU 120 determines a propagation delay compensation instruction to the UE 200 based on the determined propagation delay compensation method ( S730 ).

[0171] The DU 120 transmits system information (SIB9) including an indication of propagation delay compensation for the UE 200 to the UE 200 (S740). The SIB9 or DLInformationTransfer msg. includes "Propagation delay compensation needed."

[0172] like Figure 11 and Figure 12 As shown, when referenceTimeInfo-r16 is included in SIB9, an indication (propagation delay compensation needed) indicating whether CU 110 or DU 120 performs propagation delay compensation for UE 200 can be included (encoded) in SIB9. In addition, if CU 110 does not encode the propagation delay compensation indication in SIB9, it can be interpreted as implicitly instructing DU 120 to encode the propagation delay compensation indication in SIB9.

[0173] In addition, when referenceTimeInfo-r16 is included in DLInformationTransfer msg., CU 110 may set the indication of the propagation delay compensation in DLInformationTransfer msg.

[0174] In addition, as in operation examples 1 to 3, when the CU 110 or the DU 120 performs propagation delay compensation, "Propagation delay compensation completed" may be included in SIB9 or DLInformationTransfer msg.

[0175] Figure 16 The following shows an example of the structure of DLInformationTransfer msg. Figure 16As shown, the DLInformationTransfer msg. may include a Propagation delay compensation needed field. Propagation delay compensation needed may indicate whether the network requests the UE 200 to perform propagation delay compensation. True may indicate that the network performs the propagation delay compensation requested by the UE.

[0176] Figure 17 An example of the structure of SIB9 is shown. Figure 17 As shown, SIB9 may also include a Propagation delay compensation needed field.

[0177] (4) Action and Effect

[0178] According to the above-mentioned embodiment, the following effects can be obtained. Specifically, even when processing time information for TSN in the wireless communication system 10, the gNB 100 (CU 110 or DU 120) can reliably perform compensation for the propagation delay in the wireless section between the UE 200 and the gNB 100, or instruct compensation for the propagation delay.

[0179] Therefore, in application scenarios such as IIoT (including smart grids) that require higher synchronization accuracy, even when CU-DU split gNB deployment is applied, the respective roles and actions of CU 110 and DU 120 become clear, and CU 110 and DU 120 can appropriately collaborate to perform propagation delay compensation between UE 200 and gNB 100.

[0180] More specifically, gNB 100 can obtain the propagation delay with UE 200 based on the reception of a predetermined message or response (such as the random access preamble (msg.1) or the positioning measurement response) and perform propagation delay compensation. This propagation delay compensation can be performed in CU 110 or DU 120. This reliably eliminates the possibility of double compensation or failure to perform compensation.

[0181] In this embodiment, gNB 100 (DU 120) can determine the propagation delay with UE 200 based on the time difference between receiving and transmitting wireless signals (gNB Rx-Tx time difference) and perform propagation delay compensation. This reliably eliminates the possibility of double compensation or failure to perform compensation.

[0182] In this embodiment, gNB 100 (DU 120) can transmit time information adjusted based on the propagation delay between gNB 100 and UE 200, which is associated with the UE 200's identification information (RAN UE ID). Therefore, the time information obtained by subtracting the propagation delay in the wireless section can be reported from DU 120 to CU 110 for each UE 200.

[0183] In this embodiment, gNB 100 (DU 120) can transmit a response message (REFERENCE TIME INFORMATION REPORT) including compensation information (Propagation delay compensation completed) indicating whether propagation delay compensation has been performed with UE 200, which is associated with the UE's identification information (RAN UE ID). This makes it clear whether the time information reported from DU 120 to CU 110 has been propagation delay compensated, reliably eliminating the possibility of double compensation or non-compensation.

[0184] In this embodiment, gNB 100 (CU 110 or DU 120) can include in system information (SIB9) or downlink-related messages (DLInformationTransfer msg.) whether propagation delay compensation is required for UE 200. Therefore, even when propagation delay compensation is instructed to UE 200, it is clear whether the CU 110 or DU 120 is instructing it, reliably eliminating the possibility of duplicate instructions or no instructions.

[0185] (5) Other Implementation Methods

[0186] Although the embodiment has been described above, it is not limited to the description of the embodiment and it is obvious to those skilled in the art that various modifications and improvements can be made.

[0187] For example, the aforementioned implementation assumes the use of a CU-DU split gNB deployment, but this is not always necessary. Specifically, the CU 110 and DU 120 can be located in geographically close proximity.

[0188] Furthermore, in the above-described embodiment, connection with TSN is assumed in the wireless communication system 10 , but this does not necessarily have to be a scenario in which a network or application such as TSN requires high synchronization accuracy.

[0189] In addition, the block diagrams used in the description of the above-mentioned embodiment ( Figure 3 , 4) shows blocks in functional units. 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 a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, using wired, wireless, etc.) and implemented using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0190] Functionally, these include, but are not limited to, judging, deciding, 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 enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0191] In addition, the above-mentioned gNB 100 (CU 110 and DU 120) can also function as a computer that processes the wireless communication method of the present disclosure. Figure 18 1 is a diagram showing an example of the hardware configuration of the CU 110 and the DU 120. Figure 18 As shown, the CU 110 and the DU 120 may also be configured as a computer device including a processor 1001 , a memory 1002 (memory), a storage 1003 (storage), a communication device 1004 , an input device 1005 , an output device 1006 , and a bus 1007 .

[0192] 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.

[0193] Each functional block of CU 110 and DU 120 (refer to Figure 3 , 4) is implemented by any hardware element or combination of hardware elements of the computer device.

[0194] In addition, each function in CU 110 and DU 120 is implemented by reading predetermined software (program) into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls communication of communication device 1004 or controls at least one of reading and writing data in memory 1002 and storage 1003.

[0195] The processor 1001 controls the entire computer by, for example, executing 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.

[0196] In addition, the processor 1001 reads a program (program code), a software module or data 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-mentioned embodiment is used. In addition, with respect to the various processes described above, although it is described that the various processes are performed by one processor 1001, the various processes described above can also be performed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be installed by one or more chips. In addition, the program can also be sent from the network via a telecommunications line.

[0197] 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 ROM (EPROM), an electrically erasable programmable ROM (EEPROM), or a random access memory (RAM). Memory 1002 may also be referred to as a register, a cache, or a main memory (main storage device). Memory 1002 can store programs (program code), software modules, and the like that can execute the method according to an embodiment of the present disclosure.

[0198] The memory 1003 is a computer-readable recording medium, and may be composed of, for example, at least one of an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (for example, a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, and the like. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, other appropriate media such as a database, a server, or the like that includes at least one of the memory 1002 and the memory 1003.

[0199] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network, and may also be called a network device, a network controller, a network card, a communication module, etc.

[0200] For example, the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0201] 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).

[0202] Furthermore, the processor 1001 and 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 may be configured using separate buses for each device.

[0203] 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 such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0204] 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.

[0205] Each form / embodiment described in this disclosure may also be applied to at least one of 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), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems extended therefrom. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0206] 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.

[0207] In the present disclosure, specific actions performed by a base station are sometimes performed by its upper node depending on the situation. In a network consisting of one or more network nodes including a base station, it is obvious that 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 (for example, considering an MME or S-GW, but not limited to these). In the above, the case where there is only one other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0208] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0209] 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.

[0210] 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).

[0211] 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 scheduled information is not limited to being performed explicitly (e.g., a notification of "yes X") but may also be performed implicitly (e.g., not notifying the scheduled information).

[0212] 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.

[0213] 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.

[0214] 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.

[0215] In addition, the terms used in this disclosure and those 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). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0216] As used in this disclosure, the terms "system" and "network" may be used interchangeably.

[0217] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0218] The names used for the above parameters are not limiting in any way. 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 appropriate names, and the various names assigned to these various channels and information elements are not limiting in any way.

[0219] 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.

[0220] 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).

[0221] 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.

[0222] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0223] 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.

[0224] 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 be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., 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 Internet of Things (IoT) device such as a sensor.

[0225] 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 device-to-device (Device-to-Device: D2D), vehicle-to-everything (Vehicle-to-Everything: V2X), etc.), the various forms / implementations of the present disclosure can also be applied. In this case, it is also possible to set 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.

[0226] 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.

[0227] 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 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.

[0228] 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 include 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.

[0229] A slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0230] 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.

[0231] 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.

[0232] For example, a subframe can be called a transmission time interval (TTI), multiple consecutive subframes can be called a TTI, and a slot or minislot 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 (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a minislot, or the like, rather than a subframe.

[0233] 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.

[0234] 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 for scheduling, link adaptation, etc. Furthermore, when a TTI is assigned, 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.

[0235] In addition, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can constitute the minimum time unit of scheduling. In addition, the number of time slots (mini-time slots) constituting the minimum time unit of scheduling can be controlled.

[0236] A TTI with a time length of 1 ms is also 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 time 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 time slot, etc.

[0237] 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 length that is smaller than long TTI (longTTI) and has a TTI length of more than 1ms.

[0238] 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 consecutive 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 by the parameter set.

[0239] 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.

[0240] In addition, one or more RBs may 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.

[0241] 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.

[0242] A bandwidth part (BWP) (also known 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 are defined within a BWP and numbered within that BWP.

[0243] 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.

[0244] At least one of the configured BWPs may be active, and it is not assumed that the UE transmits or receives predetermined signals / channels outside of the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0245] 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 including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots in a slot, the number of symbols and RBs in a slot or mini-slot, the number of subcarriers in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length.

[0246] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, including the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The combination or connection between elements can be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" can be used to replace "connection". In the context of the present disclosure, two elements can be considered to be "connected" or "coupled" to each other by using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region and light (including both visible and invisible) region.

[0247] 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 applied standard.

[0248] The phrase "based on" used in this disclosure does not mean "only based on" unless otherwise expressly stated. In other words, the phrase "based on" means both "only based on" and "at least based on."

[0249] The "unit" in the configuration of each of the above-mentioned devices can be replaced with a "section", "circuit", "device", etc.

[0250] Any reference to an element using the terms "first," "second," etc., as used in this disclosure, does not necessarily limit the number or order of these elements. These terms are used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first and a second element does not imply that only two elements can be used or that the first element must precede the second element in any form.

[0251] 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.

[0252] 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 plural form.

[0253] As used in this disclosure, terms such as "determining" and "determining" sometimes include a variety of actions. "Determining" and "judging" can include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed, etc. as matters that have been "judged" or "determined". In addition, "determining" and "receiving" (for example, receiving information), transmitting (for example, sending information), inputting, outputting, accessing (for example, accessing data in a memory) as matters that have been "judged" or "determined". In addition, "determining" and "resolving" can include matters that have been selected, chosen, established, compared, etc. as matters that have been "judged" or "determined". That is, "determining" and "resolving" can include matters that have been "judged" or "determined". In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and the like.

[0254] In this disclosure, the phrase "A and B are different" may also mean "A and B are different from each other." Furthermore, the phrase may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

[0255] 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.

[0256] Description of labels:

[0257] 10 Wireless Communication Systems

[0258] 20 NG-RAN

[0259] 25 TSC GM

[0260] 30 5GC

[0261] 35 UPF

[0262] 40 IoT devices

[0263] 100 gNB

[0264] 110 CU

[0265] 111 Network Connection Department

[0266] 113 DU connection

[0267] 115 Delay compensation control unit

[0268] 117 Message Receiving Department

[0269] 119 System Information Sending Department

[0270] 120 DU

[0271] 121 Wireless Transmission Unit

[0272] 123 Wireless Receiving Unit

[0273] 124 CU connection

[0274] 125 Delay compensation control unit

[0275] 126 RA Processing Department

[0276] 127 Time Information Processing Department

[0277] 128 Message Receiving Department

[0278] 200 UE

[0279] 1001 Processor

[0280] 1002 Memory

[0281] 1003 Memory

[0282] 1004 Communication device

[0283] 1005 Input Device

[0284] 1006 Output Device

[0285] 1007 Bus

Claims

1. A wireless base station comprising a first communication node and at least one second communication node, wherein: The first communication node sends a request including identification information of the terminal to the second communication node, In response to the request, the second communication node sends back to the first communication node a response including identification information of the terminal and a time difference between reception and transmission of a wireless signal. Based on the response, propagation delay compensation is performed for the terminal associated with the identification information of the terminal.

2. The wireless base station according to claim 1, wherein The propagation delay compensation is performed in the first communication node.

3. The wireless base station according to claim 1, wherein The radio base station transmits a message including an instruction for propagation delay compensation to the terminal. The wireless base station according to claim 1 , wherein: The wireless base station transmits a message including time information related to propagation delay to the terminal.

5. A wireless communication method based on a wireless base station, wherein the wireless base station has a first communication node and at least one second communication node, wherein: The first communication node sends a request including identification information of the terminal to the second communication node, In response to the request, the second communication node sends back to the first communication node a response including identification information of the terminal and a time difference between reception and transmission of a wireless signal. Based on the response, propagation delay compensation is performed for the terminal associated with the identification information of the terminal.

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