Communication device

Abstract

To provide a communication device for appropriately executing DAPS (Dual Active Protocol Stack) Handover.SOLUTION: A radio communication system comprises a communication device 300 comprising a control unit that in specific handover from a source cell to a target cell, executes the specific handover so as not to exceed an interruption time permitted for a terminal. The specific handover is handover to be executed while maintaining a link of the source cell. The interruption time is a time for at least any one of the source cell and the target cell when a frequency band for the source cell and a frequency band for the target cell are different. The interruption time includes a first interruption time corresponding to a sub-carrier interval in a first specific frequency range and a second interruption time corresponding to a sub-carrier interval in a second specific frequency range higher than the first specific frequency range.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a communication device that performs wireless communication, and more particularly to a communication device that performs DAPS Handover. [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 15 and Release 16 (NR) specify operation in multiple frequency ranges, specifically bands including FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz).

[0004] Furthermore, studies are underway on NR that supports frequencies above 52.6 GHz up to 71 GHz (Non-Patent Document 1). Furthermore, Beyond 5G, 5G Evolution, or 6G (Release-18 and later) aims to support frequency bands above 71 GHz. [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] "Extending current NR operation to 71GHz", RP-193229, 3GPP TSG RAN Meeting #86, 3GPP, December 2019 Summary of the Invention

[0006] Meanwhile, Release 16 (NR) specifies a procedure (DAPS (Dual Active Protocol Stack) Handover) for executing handover from a source cell to a target cell while maintaining the link with the source cell. In DAPS Handover, an interruption time allowed for a terminal (UE (User Equipment)) is defined in the source cell and the target cell.

[0007] The inventors conducted extensive research into supporting frequency ranges above 52.6 GHz and found that the current specifications regarding interruption time are insufficient to properly perform DAPS Handover, and that there is a need to extend the interruption time.

[0008] The following disclosure has been made in light of the above circumstances, and aims to provide a communication device that can appropriately execute DAPS Handover by extending the interruption time.

[0009] One aspect of the present disclosure is a communications device that includes a control unit that executes a specific handover from a source cell to a target cell so as not to exceed an interruption time allowed for a terminal, wherein the specific handover is executed while maintaining a link with the source cell, and the interruption time is a time set for at least one of the source cell and the target cell when the frequency bands of the source cell and the target cell are different, and the interruption time includes a first interruption time corresponding to a subcarrier spacing of a first specific frequency range and a second interruption time corresponding to a subcarrier spacing of a second specific frequency range that is higher than the first specific frequency range. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing the overall schematic configuration of a wireless communication system 10. As shown in FIG. [Figure 2]FIG. 2 is a diagram showing frequency ranges used in the wireless communication system 10. As shown in FIG. [Figure 3] FIG. 3 is a diagram showing an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. As shown in FIG. [Figure 4] FIG. 4 is a functional block diagram of the communication device 300. [Figure 5] FIG. 5 is a diagram illustrating an example of the interruption time. [Figure 6] FIG. 6 is a diagram illustrating an example of the interruption time. [Figure 7] FIG. 7 is a diagram illustrating an example of the interruption time. [Figure 8] FIG. 8 is a diagram illustrating an example of the interruption time. [Figure 9] FIG. 9 is a diagram illustrating an example of the interruption time. [Figure 10] FIG. 10 is a diagram illustrating an example of the interruption time. [Figure 11] FIG. 11 is a diagram illustrating an example of the interruption time. [Figure 12] FIG. 12 is a diagram illustrating an example of the interruption time. [Figure 13] FIG. 13 is a diagram showing a wireless communication method (DAPS HO procedure). [Figure 14] FIG. 14 is a diagram illustrating an example of a hardware configuration of the communication device 300. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments 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 descriptions thereof will be omitted as appropriate.

[0012] [Embodiment] (1) Overall configuration of the wireless communication system 1 is a schematic diagram of an overall configuration of a wireless communication system 10 according to an 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 terminal 200 (hereinafter, UE 200).

[0013] The wireless communication system 10 may be a wireless communication system conforming to a system called Beyond 5G, 5G Evolution, or 6G.

[0014] The NG-RAN 20 includes a radio base station 100A (hereinafter, gNB100A) and a radio base station 100B (hereinafter, gNB100B). 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. 1.

[0015] The NG-RAN 20 actually includes multiple NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). The NG-RAN 20 and the 5GC may also be simply referred to as a "network."

[0016] The gNB100A and gNB100B are radio base stations conforming to 5G, and perform 5G radio communication with the UE 200. The gNB100A, gNB100B, and UE 200 are capable of supporting Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional beam BM by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which aggregates and uses multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates on two or more transport blocks between the UE and each of two NG-RAN nodes.

[0017] The wireless communication system 10 also supports a plurality of frequency ranges (FR).

[0018] 2, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows:

[0019] FR1: 410 MHz to 7.125 GHz FR2: 24.25 GHz~52.6 GHz FR1 may use a Sub-Carrier Spacing (SCS) of 15, 30, or 60 kHz and a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 or 120 kHz (including 240 kHz) and a bandwidth (BW) of 50 to 400 MHz.

[0020] Note that SCS may be interpreted as numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.

[0021] Furthermore, the wireless communication system 10 also supports frequency bands higher than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz up to 114.25 GHz. For convenience, such high frequency bands may be referred to as "FR2x" or "FR4."

[0022] To solve this problem, when using a band above 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0023] FIG. 3 shows an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. In FIG.

[0024] As shown in Figure 3, one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the interval (frequency) shown in Figure 3. For example, 480 kHz, 960 kHz, etc. may be used.

[0025] Also, the number of symbols constituting one slot does not necessarily have to be 14 (for example, 28 or 56 symbols). Furthermore, the number of slots per subframe may differ depending on the SCS.

[0026] The time direction (t) shown in Fig. 3 may be called a time domain, a symbol period, or a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), etc.

[0027] (2) Functional block configuration of wireless communication system Next, a functional block configuration of the wireless communication system 10 will be described. Specifically, a functional block configuration of the communication device 300 will be described. The communication device 300 may be a gNB 100 or a UE 200. As shown in FIG. 4 , the communication device 300 includes a communication unit 310 and a control unit 320.

[0028] The communication unit 310 performs wireless communication, including communication using channels defined by 3GPP, including a control channel and a data channel.

[0029] The control channels include a DCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a RACH (Random Access Channel), Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI), and a Physical Broadcast Channel (PBCH).

[0030] The data channel includes a PDSCH (Physical Downlink Shared Channel) and a PUSCH (Physical Uplink Shared Channel). Data refers to data transmitted via the data channel. The data channel may be read as a shared channel.

[0031] In an embodiment, wireless communication is performed using frequency ranges (FR) including FR1, FR2, and FR4. Wireless communication is performed using frequency bands included in each frequency range (FR). Wireless communication is performed using frequencies included in each frequency band. Wireless communication is performed using BWPs included in each frequency. Wireless communication may be performed using a portion of the BWP.

[0032] The control unit 320 controls the communication device 300. In the embodiment, the control unit 320 is configured as a control unit that executes a specific handover from a source cell to a target cell so as not to exceed an interruption time allowed for the UE 200. The specific handover is a handover that is executed while maintaining the link of the source cell. The specific handover may be referred to as DAPS HO (Dual Active Protocol Stack Handover). The interruption time is a time (hereinafter referred to as T) determined for the source cell. interrupt1 ) and a time period (hereinafter, Tinterrupt2 ) may also be included.

[0033] The DAPS HO may be distinguished by the FR of the source cell and the FR of the target cell. For example, the FR of the source cell (FR S ) and the target cell's FR (FR T ) is FR1, the type of DAPS HO may be called FR1-to-FR1 DAPS HO. S and FR T If the FR2 is FR2, the type of DAPS HO may be called FR2-to-FR2 DAPS HO, and if the FR S and FR T If the FR4 is used, the type of DAPS HO may be called FR4-to-FR4 DAPS HO. S is FR1, and FR T If the FR1-to-FR4 DAPS HO is FR4, the type of DAPS HO may be called FR1-to-FR4 DAPS HO. S is FR2 and FR T is FR4, the type of DAPS HO may be referred to as FR2-to-FR4 DAPS HO.

[0034] DAPS HO may be distinguished by the frequency band of the source cell and the frequency band of the target cell. For example, if the frequency band of the source cell and the frequency band of the target cell are the same, the type of DAPS HO may be called intra-band DAPS HO. If the frequency band of the source cell and the frequency band of the target cell are different, the type of DAPS HO may be called inter-band DAPS HO.

[0035] DAPS HO may be distinguished by the frequency of the source cell and the frequency of the target cell. For example, if the frequency of the source cell and the frequency of the target cell are the same, the type of DAPS HO may be called intra-frequency DAPS HO. If the frequency of the source cell and the frequency of the target cell are different, the type of DAPS HO may be called inter-frequency DAPS HO.

[0036] The type of DAPS HO may be defined by a combination of the above-mentioned frequency range, frequency band, and frequency.

[0037] (3) Interruption time Next, the interruption time will be explained. Here, the interruption time (T interrupt1 , T interrupt2 ) will be explained. interrupt1 , T interrupt2 may include a time used when the UE 200 and the target cell are synchronized (Sync) and a time used when the UE 200 and the target cell are not synchronized (Async). interrupt1 may be defined for each SCS of the source cell. interrupt2 may be defined for each SCS of the target cell. The index identifying the SCS of the source cell may be referred to as "μ". T interrupt1 , T interrupt2 may be defined by the number of slots.

[0038] Here, the SCS of the source cell and the target cell may be represented by a slot length (NR slot length). For example, when the SCS is 15 kHz, "μ" is 0 and the NR slot length is 1 ms; when the SCS is 30 kHz, "μ" is 1 and the NR slot length is 0.5 ms; when the SCS is 60 kHz, "μ" is 2 and the NR slot length is 0.25 ms; and when the SCS is 120 kHz, "μ" is 3 and the NR slot length is 0.125 ms. Note that when the SCS is greater than 120 kHz, the SCS may be expressed as "15×2 n In such a case, "μ" may be expressed as n, and the NR slot length may be expressed as "0.5 n However, if "μ" is not a consecutive integer, "μ" may be corrected to a consecutive integer.

[0039] In the following, under the above assumptions, T interrupt1 , T interrupt2 Details will be explained below.

[0040] (3.1) Inter-band DAPS HO Here, a case where the frequency bands of the source cell and the target cell are different will be described. Furthermore, the interruption time (T) of DAPS HO (i.e., FR1-to-FR4 inter-band DAPS HO, FR2-to-FR4 inter-band DAPS HO, FR4-to-FR4 inter-band DAPS HO) which is considered to need to be defined with the introduction of FR4 will be described. interrupt1 , T interrupt2 ) will be explained.

[0041] In such a case, the interruption time includes a first interruption time corresponding to a subcarrier spacing of a first specific frequency range (e.g., FR1, FR2) and a second interruption time corresponding to a subcarrier spacing of the first specific frequency range (e.g., FR4).

[0042] Here, the first interruption time may be considered to be the time defined in the existing specifications (TS38.133 V16.4.0 §6.1.3.2 to §6.1.3.4), and the second interruption time may be considered to be an extension of the existing specifications.

[0043] First, T interrupt1 This will be explained with reference to FIG. 5. As shown in FIG. interrupt1 may be expressed by "2n±X". X may be any integer. X may be different for each μ(SCS). X may take different values depending on whether UE 200 is synchronized with the target cell (Sync) or not (Async).

[0044] For example, "T" defined in TS38.133 V16.4.0 §6.1.3.4 interrupt1 For FR1-to-FR2 inter-band DAPS HO, the T of FR1-to-FR4 inter-band DAPS HO is interrupt1 The first suspension time corresponds to an SCS where μ is 2 or less (the NR slot length of the source cell is 0.25 ms or less), and the second suspension time corresponds to an SCS where μ is greater than 2 (the NR slot length of the source cell is less than 0.25 ms). The first suspension time corresponds to the "T interrupt1 The second interruption time may be the same as the time specified in "for FR1-to-FR2 inter-band DAPS HO". interrupt1 It can be considered an extension to "for FR1-to-FR2 inter-band DAPS HO".

[0045] For example, "T" defined in TS38.133 V16.4.0 §6.1.3.3 interrupt1For comparison with FR2-to-FR1 inter-band DAPS HO, the T of FR2-to-FR4 inter-band DAPS HO interrupt1 The first suspension time corresponds to an SCS where μ is 3 or less (the NR slot length of the source cell is 0.125 ms or less), and the second suspension time corresponds to an SCS where μ is greater than 3 (the NR slot length of the source cell is less than 0.125 ms). The first suspension time corresponds to the "T interrupt1 The second interruption time may be the same as the time specified in "for FR2-to-FR1 inter-band DAPS HO". interrupt1 It can be considered an extension to "for FR2-to-FR1 inter-band DAPS HO".

[0046] For example, FR4-to-FR4 inter-band DAPS HO T interrupt1 may include a second interruption time corresponding to a newly defined SCS (e.g., SCS corresponding to n equal to or greater than 4) for a second specific frequency range (e.g., FR4). interrupt1 may include a first interruption time corresponding to an SCS (eg, an SCS corresponding to n less than or equal to 3) already defined for a first particular frequency range (eg, FR1, FR2).

[0047] Second, T interrupt2 This will be explained with reference to FIG. 6. As shown in FIG. interrupt2 may be expressed by "2n±X". X may be any integer. X may be different for each μ(SCS). X may take different values depending on whether UE 200 is synchronized with the target cell (Sync) or not (Async).

[0048] For example, the T of FR1-to-FR4 inter-band DAPS HO interrupt2may include a second interruption time corresponding to a newly defined SCS (e.g., SCS corresponding to n equal to or greater than 4) for a second specific frequency range (e.g., FR4). interrupt2 may include a first interruption time corresponding to an SCS (eg, an SCS corresponding to n less than or equal to 3) already defined for a first particular frequency range (eg, FR1, FR2).

[0049] For example, FR2-to-FR4 inter-band DAPS HO T interrupt2 may include a second interruption time corresponding to a newly defined SCS (e.g., SCS corresponding to n equal to or greater than 4) for a second specific frequency range (e.g., FR4). interrupt2 may include a first interruption time corresponding to an SCS (eg, an SCS corresponding to n less than or equal to 3) already defined for a first particular frequency range (eg, FR1, FR2).

[0050] For example, FR4-to-FR4 inter-band DAPS HO T interrupt2 may include a second interruption time corresponding to a newly defined SCS (e.g., SCS corresponding to n equal to or greater than 4) for a second specific frequency range (e.g., FR4). interrupt2 may include a first interruption time corresponding to an SCS (eg, an SCS corresponding to n less than or equal to 3) already defined for a first particular frequency range (eg, FR1, FR2).

[0051] As described in FIG. 5 and FIG. 6, the interruption time for inter-band DAPS HO may include a first interruption time corresponding to the subcarrier spacing of a first specific frequency range (e.g., FR1, FR2) and a second interruption time corresponding to the subcarrier spacing of a first specific frequency range (e.g., FR4). For example, the interruption time for FR1 (FR2, FR4)-to-FR4 inter-band DAPS HO (e.g., T occurring in the target cell) may be set as follows: interrupt2 ) does not include the first interruption time but includes the second interruption time, while the interruption time for FR1-to-FR4 inter-band DAPS HO (e.g., T interrupt1 ) may include the first interruption time without including the second interruption time.

[0052] (3.2) Intra-frequency DAPS HO Here, a case will be described in which the frequencies of the source cell and the target cell are the same.

[0053] In such a case, the suspension time includes a first suspension time used when the subcarrier spacing of the source cell and the target cell is the same, and a second suspension time used when the subcarrier spacing of the source cell and the target cell is different.

[0054] Here, the first interruption time may be considered to be the time defined in the existing specifications (TS38.133 V16.4.0 §6.1.3.2 to §6.1.3.4), and the second interruption time may be considered to be an extension of the existing specifications.

[0055] First, T interrupt1 This will be described with reference to FIG.

[0056] As shown in the upper part of Figure 7, the first interruption time is defined when the subcarrier intervals of the source cell and the target cell are the same. The first interruption time is defined in §6.1.3.2 of TS38.133 V16.4.0. interrupt1It may be similar to "for FR1-to-FR1 intra-frequency DAPS HO".

[0057] Furthermore, as shown in the lower part of FIG. 7, a second interruption time is defined in the case where the subcarrier spacing between the source cell and the target cell is different. The second interruption time is defined as "T interrupt1 The second interruption time may be expressed by the first interruption time + Y, where Y may be any positive integer. Y may be different for each μ(SCS). That is, the T used in different SCS cases may be different. interrupt1 is the T used in the case where the SCS is the same. interrupt1 Furthermore, Y may take different values depending on whether the UE 200 is synchronized with the target cell (Sync) or not (Async).

[0058] Second, T interrupt2 This will be described with reference to FIG.

[0059] As shown in the upper part of Figure 8, the first interruption time is defined when the subcarrier intervals of the source cell and the target cell are the same. The first interruption time is defined in §6.1.3.2 of TS38.133 V16.4.0. interrupt2 It may be similar to "for FR1-to-FR1 intra-frequency DAPS HO".

[0060] Furthermore, as shown in the lower part of FIG. 8, a second interruption time is defined in the case where the subcarrier spacing between the source cell and the target cell is different. The second interruption time is defined as "T interrupt2The second interruption time may be expressed by the first interruption time + Y, where Y may be any positive integer. Y may be different for each μ(SCS). That is, the T used in different SCS cases may be different. interrupt2 is the T used in the case where the SCS is the same. interrupt2 Furthermore, Y may take different values depending on whether the UE 200 is synchronized with the target cell (Sync) or not (Async).

[0061] Here, the FR1-to-FR1 intra-frequency DAPS HO has been described as an example, but the first and second interruption times may also be determined for the FR2-to-FR2 intra-frequency DAPS HO and the FR4-to-FR4 intra-frequency DAPS HO. In such a case, the second interruption time (T interrupt1 , T interrupt2 ) is the first interruption time (T interrupt1 , T interrupt2 ) longer than

[0062] (3.3) intra-band inter-frequency DAPS HO Here, a case will be described in which the frequency bands of the source cell and the target cell are the same, but the frequencies of the source cell and the target cell are different. Note that the case in which the frequency bands of the source cell and the target cell are the same and the frequencies of the source cell and the target cell are the same is the same as the intra-frequency DAPS HO described above.

[0063] In such a case, the suspension time includes a first suspension time used when the subcarrier spacing of the source cell and the target cell is the same, and a second suspension time used when the subcarrier spacing of the source cell and the target cell is different. Here, the first interruption time may be considered to be the time defined in the existing specifications (TS38.133 V16.4.0 §6.1.3.2 to §6.1.3.4), and the second interruption time may be considered to be an extension of the existing specifications.

[0064] First, T interrupt1 This will be described with reference to FIG.

[0065] As shown in the upper part of Figure 9, the first suspension time is defined when the subcarrier intervals of the source cell and the target cell are the same. The first suspension time is defined in §6.1.3.2 of TS38.133 V16.4.0. interrupt1 It may be the same as for FR1-to-FR1 intra-band inter-frequency DAPS HO”. SMTC_duration is an information element indicating the longest SMTC (SSB-Based RRM Measurement Timing Configuration) period between the source cell and the target cell.

[0066] Furthermore, as shown in the lower part of FIG. 9, a second interruption time is defined in the case where the subcarrier spacing between the source cell and the target cell is different. The second interruption time is defined as "T interrupt1 The second interruption time may be expressed by the first interruption time + Y, where Y may be any positive integer. Y may be different for each μ(SCS). That is, the T used in different SCS cases may be different. interrupt1 is the T used in the case where the SCS is the same. interrupt1 Furthermore, Y may take different values depending on whether the UE 200 is synchronized with the target cell (Sync) or not (Async).

[0067] Second, T interrupt2This will be explained with reference to FIG.

[0068] As shown in the upper part of Figure 10, the first interruption time is defined when the subcarrier intervals of the source cell and the target cell are the same. The first interruption time is defined in §6.1.3.2 of TS38.133 V16.4.0. interrupt2 It may be the same as for FR1-to-FR1 intra-band inter-frequency DAPS HO”. SMTC_duration is an information element indicating the longest SMTC period between the source cell and the target cell.

[0069] Furthermore, as shown in the lower part of FIG. 10, a second interruption time is defined in the case where the subcarrier spacing between the source cell and the target cell is different. The second interruption time is defined as "T interrupt2 The second interruption time may be expressed by the first interruption time + Y, where Y may be any positive integer. Y may be different for each μ(SCS). That is, the T used in different SCS cases may be different. interrupt2 is the T used in the case where the SCS is the same. interrupt2 Furthermore, Y may take different values depending on whether the UE 200 is synchronized with the target cell (Sync) or not (Async).

[0070] Here, the FR1-to-FR1 intra-band inter-frequency DAPS HO has been described as an example, but the first and second interruption times may be similarly determined for the FR2-to-FR2 intra-band inter-frequency DAPS HO and the FR4-to-FR4 intra-band inter-frequency DAPS HO. In such a case, the second interruption time (T interrupt1 , T interrupt2) is the first interruption time (T interrupt1 , T interrupt2 ) longer than

[0071] (3.4) Intra-frequency DAPS HO Here, a case will be described in which the frequencies of the source cell and the target cell are the same. Although not particularly limited, the SCSs of the source cell and the target cell may be the same.

[0072] In such a case, the method includes a first suspension time to be used when the BWP of the target cell is not larger than the BWP of the source cell, and a second suspension time to be used when the BWP of the target cell is larger than the BWP of the source cell. Here, the first interruption time may be considered to be the time defined in the existing specifications (TS38.133 V16.4.0 §6.1.3.2 to §6.1.3.4), and the second interruption time may be considered to be an extension of the existing specifications.

[0073] First, T interrupt1 This will be described with reference to FIG.

[0074] As shown in the upper part of Figure 11, when the BWP of the target cell is not larger than the BWP of the source cell, the first suspension time is defined. The first suspension time is defined in §6.1.3.2 of TS38.133 V16.4.0. interrupt1 It may be similar to "for FR1-to-FR1 intra-frequency DAPS HO".

[0075] Furthermore, as shown in the lower part of FIG. 11, a second interruption time is defined when the BWP of the target cell is larger than the BWP of the source cell. The second interruption time is defined as "T interrupt1This may be considered as an extension to "FR1-to-FR1 intra-frequency DAPS HO". The second interruption time may be expressed as the first interruption time + Z, where Z may be any positive integer. Z may be different for each μ(SCS). That is, T is used in the case where the BWP of the target cell is larger than the BWP of the source cell. interrupt1 is used when the BWP of the target cell is not larger than the BWP of the source cell. interrupt1 Furthermore, Z may take different values depending on whether the UE 200 is synchronized with the target cell (Sync) or not (Async).

[0076] Second, T interrupt2 This will be described with reference to FIG.

[0077] As shown in the upper part of Figure 12, when the BWP of the target cell is not larger than the BWP of the source cell, the first suspension time is defined. The first suspension time is defined in §6.1.3.2 of TS38.133 V16.4.0. interrupt2 It may be similar to "for FR1-to-FR1 intra-frequency DAPS HO".

[0078] Furthermore, as shown in the lower part of FIG. 12, a second interruption time is defined when the BWP of the target cell is larger than the BWP of the source cell. The second interruption time is defined as "T interrupt2 The second interruption time may be expressed as the first interruption time + Z, where Z may be any positive integer. Z may be different for each μ(SCS). That is, the T used in different SCS cases may be different. interrupt2 is the T used in the case where the SCS is the same. interrupt2Furthermore, Z may take different values depending on whether the UE 200 is synchronized with the target cell (Sync) or not (Async).

[0079] Here, the FR1-to-FR1 intra-frequency DAPS HO has been described as an example, but the first and second suspension times may also be determined for the FR2-to-FR2 intra-frequency DAPS HO and the FR4-to-FR4 intra-frequency DAPS HO. In such a case, the second suspension time (T interrupt1 , T interrupt2 ) is the first interruption time (T interrupt1 , T interrupt2 ) longer than

[0080] Here, the case where the SCS of the source cell and the target cell are the same is illustrated as an example, but the SCS of the source cell and the target cell may be different, as in (3.2) above.

[0081] (4) Example of operation An example of the operation of the wireless communication method (DAPS HO procedure) will be described below. Here, in FIG. 13, the source cell 400S is a source cell in DAPS HO, and the target cell 400T is a target cell in DAPS HO. The source cell 400S may be a cell managed by the gNB 100A, and the target cell 400T may be a cell managed by the gNB 100B. However, the source cell 400S and the target cell 400T may be managed by the same gNB 100.

[0082] As shown in FIG. 13, in step S10, the source cell 400S transmits to the UE 200 a message (HO request) including an information element instructing DAPS HO.

[0083] In step S11, the source cell 400S transmits user data to the target cell 400T.

[0084] In step S12, a connection procedure (Random Access Procedure) is executed between the UE 200 and the target cell 400T.

[0085] In step S13, the target cell 400T transmits to the source cell 400S a message (HO successful) including an information element indicating that the connection between the UE 200 and the target cell 400T has been successful.

[0086] In step S14, the source cell 400S stops downlink transmission.

[0087] In step S15, the target cell 400T transmits to the UE 200 a message (Release source cell connection) including an information element indicating that the connection between the UE 200 and the source cell 400S is to be released.

[0088] In step S16, in response to receiving the Release source cell connection, the UE 200 releases the connection between the UE 200 and the source cell 400S (Release action).

[0089] Here, during a period (period A) until the process of step S12 is executed, the UE 200 receives a downlink signal from the source cell 400S and transmits an uplink signal to the source cell 400S. During period A, the UE 200 does not receive a downlink signal from the target cell 400T and does not transmit an uplink signal to the target cell 400T.

[0090] The UE 200 receives downlink signals from both the source cell 400S and the target cell 400T during a period (period B) from when the UE 200 executes the process of step S12 to when the UE 200 executes the process of step S15. Strictly speaking, the UE 200 receives downlink signals from both the source cell 400S and the target cell 400T during a period from when the UE 200 executes the process of step S12 to when the UE 200 executes the process of step S14. On the other hand, during period B, the UE 200 does not transmit an uplink signal to the source cell 400S, but transmits an uplink signal to the target cell 400T.

[0091] In a period (period C) after the process of step S15 is performed, the UE 200 receives a downlink signal from the target cell 400T and transmits an uplink signal to the target cell 400T. In period A, the UE 200 does not receive a downlink signal from the source cell 400S and does not transmit an uplink signal to the source cell 400S.

[0092] Under this assumption, the UE 200 determines whether the HO request is received within a specific time (for example, D handover1 ) within the time limit. handover1 During the period, the source cell 400S interrupt1 In other words, the above-mentioned T interrupt1 may be considered to be the interruption time allowed for the UE 200 with respect to the source cell 400S.

[0093] On the other hand, when the UE 200 receives an RRC message (Release source cell connection shown in step S15) that implicitly indicates a source cell release command after the RACH procedure of the target cell 400T is successful, the UE 200 may perform the release operation of the source cell 400S for a specific time (for example, D handover2 ) within the time limit.handover2 During this period, the target cell was 400T. interrupt2 In other words, the above-mentioned T interrupt2 may be considered to be the outage time allowed for the UE 200 with respect to the target cell 400T.

[0094] In this way, the communication device 300 determines the interruption time (T interrupt1 ) in the DAPS HO. In such a case, the communication device 300 may be the UE 200 or the gNB 100 that manages the source cell 400S. Similarly, the communication device 300 may perform the DAPS HO so as not to exceed the interruption time (T interrupt2 ) in order to prevent the DAPS HO from exceeding the threshold value. In such a case, the communication device 300 may be the UE 200 or the gNB 100 that manages the target cell 400T.

[0095] (5) Action and effect In the embodiment, the communication device 300 determines the interruption time (T interrupt1 , T interrupt2 ) and execute DAPS HO so that the interruption time does not exceed the limit. Under these conditions, the interruption time is determined as follows:

[0096] First, in addition to a first interruption time corresponding to the SCS in the first specific frequency range (FR1, FR2), a second interruption time corresponding to the SCS in the second specific frequency range (FR4) is defined. With this configuration, DAPS HO can be properly performed even when an SCS in the second specific frequency range (FR4) that is larger than the SCS in the first specific frequency range (FR1, FR2) is introduced.

[0097] Second, in intra-frequency DAPS HO or intra-band inter-frequency DAPS HO, in addition to a first suspension time used when the SCSs of the source cell and the target cell are the same, a second suspension time used when the SCSs of the source cell and the target cell are different is defined. With this configuration, it is possible to consider the case where the SCSs of the source cell and the target cell are different. Furthermore, since the second suspension time is longer than the first suspension time, it is possible to appropriately perform DAPS HO assuming the case where the SCSs of the source cell and the target cell are different.

[0098] Third, in intra-frequency DAPS HO, in addition to a first suspension time used when the BWP of the target cell is not larger than that of the source cell, a second suspension time used when the BWP of the target cell is larger than that of the source cell is defined. With this configuration, it is possible to consider the case where the BWP of the target cell is larger than that of the source cell. Furthermore, because the second suspension time is longer than the first suspension time, it is possible to appropriately perform DAPS HO assuming the case where the BWP of the target cell is larger than that of the source cell.

[0099] [Other embodiments] The present invention has been described above in accordance with the embodiments, but it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0100] In the above disclosure, a case has been described in which the second suspension time is applied instead of the first suspension time when the BWP of the target cell is larger than the BWP of the source cell. However, the above disclosure is not limited to this. For example, when a portion of the BWP of the target cell is unused and a band equal to the BWP of the source cell is used in the target cell, the first suspension time may be applied instead of the second suspension time. With this configuration, it is possible to prevent the suspension time from becoming inappropriately long when the BWP of the target cell is larger than the BWP of the source cell.

[0101] Here, equal bandwidth usage may mean that the location of the BWP of the target cell is contained within the location of the BWP of the source cell, or that the bandwidth of the BWP of the target cell is equal to or less than the bandwidth of the BWP of the source cell.

[0102] The block diagram (FIG. 4) used in the description of the above-described embodiment shows functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are connected directly or indirectly (for example, by wire, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0103] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, regard, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how each is implemented.

[0104] Furthermore, the above-described communication device 300 (the device) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 14 is a diagram showing an example of the hardware configuration of the device. As shown in Fig. 14, the device may be configured as a computer including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0105] In the following description, the term "apparatus" can 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.

[0106] Each functional block of the device (see FIG. 4) is realized by any hardware element of the computer device or a combination of the hardware elements.

[0107] In addition, each function of the device is realized by loading specified software (programs) onto hardware such as processor 1001 and memory 1002, causing processor 1001 to perform calculations, control communication via communication device 1004, and control at least one of reading and writing data in memory 1002 and storage 1003.

[0108] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0109] The processor 1001 also reads 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 in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-mentioned embodiments. Furthermore, the various processes described above 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.

[0110] The memory 1002 is a computer-readable recording medium and may be configured by, for example, at least one of 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., that can execute a method according to an embodiment of the present disclosure.

[0111] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of 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 disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other appropriate medium including at least one of memory 1002 and storage 1003.

[0112] The communication device 1004 is hardware (transmission / reception device) for communicating 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.

[0113] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0114] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0115] Furthermore, each device such as the processor 1001 and the memory 1002 is connected to 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.

[0116] 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 realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0117] 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 thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0118] 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, a 4th generation mobile communication system (4G), a 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), or other suitable system, and a next-generation system extended based on these. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G) may also be applied.

[0119] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless it is consistent. 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.

[0120] In the present disclosure, a specific operation described as being 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 another network node other than the base station (for example, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station, a combination of multiple other network nodes (for example, an MME and an S-GW) may also be used.

[0121] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0122] The input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information may be overwritten, updated, or added. The output information may be deleted. The input information may be sent to another device.

[0123] The determination may be made based on a value represented by one bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0124] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, notification of predetermined information (e.g., notification that "X is true") is not limited to being done explicitly, but may be done implicitly (e.g., by not notifying the predetermined information).

[0125] 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.

[0126] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0127] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, 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.

[0128] Note that terms explained in this disclosure and 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). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0129] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0130] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from a predetermined value, or other corresponding information. For example, a radio resource may be indicated by an index.

[0131] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions 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 intended to be limiting in any way.

[0132] 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," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0133] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0134] The terms "cell" or "sector" refer to part or all of the coverage area of a base station and / or base station subsystem that provides communication services within that coverage area.

[0135] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0136] 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.

[0137] 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 mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile 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 also include devices that do 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.

[0138] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, the aspects / embodiments 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, terms such as uplink channel and downlink channel may be read as side channel.

[0139] 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.

[0140] A radio frame may be composed of one or more frames in the time domain, each of which may be called a subframe.

[0141] A subframe may further be composed of one or more slots in the time domain, and may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0142] Numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by a transceiver in the frequency domain, and specific windowing operations performed by a transceiver in the time domain.

[0143] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol). A slot may be a time unit based on numerology.

[0144] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist 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.

[0145] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0146] 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 existing LTE, a period shorter than 1 ms (e.g., 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.

[0147] Here, TTI refers to, for example, the smallest 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. However, the definition of TTI is not limited to this.

[0148] 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) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0149] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0150] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0151] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 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.

[0152] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of numerology, for example, 12. The number of subcarriers included in an RB may also be determined based on numerology.

[0153] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0154] Note that one or more RBs may also 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.

[0155] 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.

[0156] 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 given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0157] 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.

[0158] 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 read as "BWP."

[0159] The above-described 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.

[0160] 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 one or more wires, cables, and / or 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.

[0161] The reference signal may also be abbreviated as Reference Signal (RS), and may also be called a pilot depending on the applicable standard.

[0162] 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."

[0163] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0164] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, 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.

[0165] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0166] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0167] 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, searching, inquiring (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 memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0168] 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."

[0169] 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 herein. 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]

[0170] 10. Wireless communication systems 20 NG-RAN 100 gNB 200 UE 300 Communication Equipment 310 Communications Department 320 Control Unit 400S Source Cell 400T target cell 1001 processor 1002 memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output Device 1007 Bus

Claims

1. a control unit that executes a specific handover from a source cell to a target cell so as not to exceed an interruption time allowed for a terminal; The specific handover is a handover that is performed while maintaining the link of the source cell, The interruption time is a time determined for at least one of the source cell and the target cell when the frequency bands of the source cell and the target cell are different, the interruption time includes a first interruption time corresponding to a subcarrier spacing of a first specific frequency range and a second interruption time corresponding to a subcarrier spacing of a second specific frequency range higher than the first specific frequency range; the first specific frequency range includes a frequency band from 410 MHz to 7.125 GHz and a frequency band from 24.25 GHz to 52.6 GHz; the second specific frequency range includes a frequency band exceeding 52.6 GHz up to 71 GHz; The second interruption time is longer than the first interruption time.

2. a control unit that executes a specific handover from a source cell to a target cell so as not to exceed an interruption time allowed for a terminal; The specific handover is a handover that is performed while maintaining the link of the source cell, The interruption time is a time determined for at least one of the source cell and the target cell when the frequencies of the source cell and the target cell are the same; A communications device, wherein the interruption time includes a first interruption time used when the subcarrier spacing of the source cell and the target cell is the same, and a second interruption time used when the subcarrier spacing of the source cell and the target cell is different.

3. a control unit that executes a specific handover from a source cell to a target cell so as not to exceed an interruption time allowed for a terminal; The specific handover is a handover that is performed while maintaining the link of the source cell, The interruption time is a time defined in at least one of the source cell and the target cell when the frequency or frequency band of the source cell and the target cell is the same; The interruption time includes a first interruption time used when the subcarrier spacing of the source cell and the target cell is the same, and a second interruption time used when the subcarrier spacing of the source cell and the target cell is different, The second interruption time is longer than the first interruption time.

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