Terminals and wireless communication methods

Abstract

This terminal comprises: a transmission unit that transmits a radio signal to a base station; and a control unit that selects at least one frequency band from among three or more frequency bands in which the radio signal can be transmitted, and that switches a frequency band for transmitting the radio signal to the selected frequency band.

Description

Technical Field

[0001] The present disclosure relates to a terminal that switches a frequency band for transmitting a wireless signal and a wireless communication method.

Background Art

[0002] The 3rd Generation Partnership Project (3GPP) is standardizing the 5th generation mobile communication system (also called 5G, New Radio (NR), or Next Generation (NG)), and is also progressing with the standardization of the next generation, called Beyond 5G, 5G Evolution, or 6G.

[0003] Since 3GPP Release 16, Tx (Transmitter) switching has been discussed in SUL (Supplementary UpLink) and CA (Carrier Aggregation). Tx switching is a technology that switches the frequency band for transmitting a wireless signal from at least one of a plurality of antennas provided in a terminal to selectively implement SUL or CA. Further, in the Tx switching of 3GPP Release 18, switching the frequency band for transmitting a wireless signal among three or more frequency bands has been studied (Non-Patent Document 1).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] However, having more than three options for the frequency band used to transmit wireless signals could increase the load on the terminal.

[0006] Therefore, this disclosure has been made in view of these circumstances, and aims to provide a terminal and wireless communication method that suppress the load of switching frequency bands even when there are three or more options for frequency bands to transmit wireless signals.

[0007] One aspect of the disclosure is a transmitting unit that transmits a radio signal to a base station, A control unit that selects at least one frequency band from three or more frequency bands capable of transmitting the aforementioned wireless signal, and switches the frequency band to which the wireless signal is transmitted to the selected frequency band, It is a terminal equipped with [a certain feature].

[0008] One aspect of the disclosure is a wireless communication method comprising the steps of: selecting at least one frequency band from three or more frequency bands on which a wireless signal can be transmitted; switching the frequency band to which the wireless signal is transmitted to the selected frequency band; and transmitting the wireless signal to a base station. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic diagram of the overall configuration of the wireless communication system 10. [Figure 2] Figure 2 shows the switching of frequency bands. [Figure 3] Figure 3 is a functional block diagram of terminal 200. [Figure 4] Figure 4 shows the selection of frequency bands. [Figure 5] Figure 5 shows the selection of frequency bands. [Figure 6] Figure 6 shows a time-based frequency band switching. [Figure 7] Figure 7 shows an example of information indicating the selectable frequency bands or the frequency band to be selected. [Figure 8]Figure 8 shows an example of information that notifies you of the frequency band to select, or the group to set as active or inactive. [Figure 9] Figure 9 shows the grouping of frequency bands. [Figure 10] Figure 10 shows an example of information that notifies you of which group to set as active or inactive. [Figure 11] Figure 11 shows the selection and switching of frequency bands in each group. [Figure 12] Figure 12 shows the selection and switching of frequency bands in each group. [Figure 13] Figure 13 shows an example of grouping and switching. [Figure 14] Figure 14 shows an example of grouping and switching. [Figure 15] Figure 15 shows an example of the hardware configuration of a wireless base station 100 and a terminal 200. [Figure 16] Figure 16 shows an example of the configuration of vehicle 2001. [Modes for carrying out the invention]

[0010] The embodiments will be described below with reference to the drawings. Note that identical or similar reference numerals are used to denote the same functions and components, and their descriptions will be omitted as appropriate.

[0011] [Embodiment] (1) Overall outline of the wireless communication system Figure 1 is a schematic diagram of the overall configuration of the wireless communication system 10 according to the embodiment. The wireless communication system 10 is a wireless communication system in accordance with 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter referred to as NG-RAN20) and a terminal 200 (hereinafter referred to as UE200).

[0012] Note that the wireless communication system 10 may also be a wireless communication system that complies with a system called Beyond 5G, 5G Evolution, or 6G.

[0013] NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). The gNB 100 transmits and receives radio signals to and from the UE 200. Note that the specific configuration of the wireless communication system 10, such as the number of gNB 100s and UEs 200, is not limited to the example shown in FIG. 1.

[0014] NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs). Note that NG-RAN 20 may simply be expressed as the "network".

[0015] The UE 200 transmits and receives radio signals to and from the gNB 100. When transmitting a radio signal to the gNB 100, the UE 200 according to the embodiment can switch the frequency band for transmitting the radio signal.

[0016] Specifically, as shown in FIG. 2, the UE 200 transmits radio signals from a plurality of antennas. For each of the radio signals transmitted from the plurality of antennas, the UE 200 can select the frequency band for transmitting the radio signal and switch the frequency band for transmitting the radio signal to the selected frequency band.

[0017] Note that in FIG. 2, the UE 200 can select four frequency bands, namely, Bands A, B, C, and D, but is not limited thereto. The UE 200 may be able to select three frequency bands, namely, Bands A, B, and C, or may be able to select five or more frequency bands. Hereinafter, a set of frequency bands that the UE 200 can select may also be referred to as a band combination. Note that the band combination may be set to two or more from the frequency bands that the UE 200 can select.

[0018] Furthermore, the frequency bands that the wireless communication system 10 can support, including the frequency bands that the UE200 can select, are not particularly limited. For example, they may be FR1, FR2, or higher. The frequency band for FR1 is 410MHz to 7.125GHz, and the frequency band for FR2 is 24.25GHz to 52.6GHz.

[0019] (2) Functional block configuration of the wireless communication system Figure 3 is a functional block diagram of the UE200. As shown in Figure 3, the UE200 comprises a wireless signal transmission / reception unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, an encoding / decoding unit 250, a data transmission / reception unit 260, and a control unit 270.

[0020] The wireless signal transceiver 210 transmits and receives wireless signals with the gNB100. The wireless signal transceiver 210 supports Massive MIMO, SUL which is achieved by switching the frequency band used to transmit wireless signals on the uplink (UL), CA which uses multiple CCs bundled together, and DC which communicates simultaneously between the UE and each of the two NG-RAN Nodes.

[0021] The wireless signal transmitting and receiving unit 210 of this embodiment may consist of a transmitting unit that transmits a wireless signal to the gNB100 and a receiving unit that receives a wireless signal from the gNB100.

[0022] The amplifier section 220 consists of components such as a PA (Power Amplifier) ​​and an LNA (Low Noise Amplifier). The amplifier section 220 amplifies the wireless signal output from the modulation / demodulation section 230 to a predetermined power level. The amplifier section 220 also amplifies the wireless signal output from the wireless signal transmission / reception section 210.

[0023] The modulation / demodulation unit 230 performs data modulation / demodulation, transmit power setting, and resource block allocation for each predetermined communication destination (gNB100 or other gNB). The modulation / demodulation unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0024] The modulation / demodulation unit 230 of the embodiment can switch the frequency band to which the wireless signal is transmitted. Specifically, the modulation / demodulation unit 230 can select at least one frequency band from three or more selectable frequency bands and switch the frequency band to which the wireless signal is transmitted to the selected frequency band. The modulation / demodulation unit 230 may also switch the frequency band to which the wireless signal is transmitted to a frequency band other than the selected frequency band. Alternatively, instead of switching the frequency band to which the wireless signal is transmitted to the selected frequency band, the modulation / demodulation unit 230 can switch the frequency band to which the signal is transmitted to a frequency band within a group that is set to be actively configured, as described later.

[0025] The frequency band selected by the modulation / demodulation unit 230 may also be referred to as the anchor band below. In this embodiment, the anchor band is used to mean the frequency band selected for transmitting wireless signals, and not, for example, the frequency band used in 4G in a 5G NSA system.

[0026] Figure 4 shows an example where Band A is selected as the anchor band from among four frequency bands: Bands A, B, C, and D. In this case, the frequency band used to transmit the radio signal is switched from Band B to Band A, which has become the anchor band. Furthermore, the UE200 may perform scheduling related to UL transmission only in Band B, which was the frequency band before the switch, and Band A, which has become the anchor band. In other words, the UE200 does not need to consider (or can ignore) scheduling related to UL transmission in Bands C and D.

[0027] Figure 5 shows an example where Band A and Band C are selected as anchor bands from among the four frequency bands Band A, B, C, and D. In this case, the frequency band used to transmit the radio signal is switched from Band B to either Band A or Band C, which has become an anchor band. Furthermore, the UE200 may perform scheduling related to UL transmission only in Band B, which was the frequency band before the switch, and in Bands A and C, which have become anchor bands. In other words, the UE200 does not need to consider (or ignore) scheduling related to UL transmission in Band D.

[0028] Furthermore, if the frequency band used to transmit the wireless signal is Band A, which is selected as the Anchor band, the frequency band used to transmit the wireless signal may be switched to Band B, C, or D. In this case, that is, when the frequency band used to transmit the wireless signal is not the selected frequency band, the modulation / demodulation unit 230 may start counting using a timer or other function, as shown in Figure 6. After the counting has finished (expireed), the modulation / demodulation unit 230 may switch the frequency band used to transmit the wireless signal to the selected frequency band.

[0029] The count of the modulation / demodulation unit 230 may be reset, for example, when scheduling for UL transmission in a frequency band other than the Anchor Band.

[0030] The count value of the modulation / demodulation unit 230 may be dynamically set by the RRC (Radio Resource Control) control signal transmitted from the gNB100, or it may be set statically in advance.

[0031] The control signal / reference signal processing unit 240 performs processing related to various control signals and reference signals transmitted and received by the UE200.

[0032] The control signal / reference signal processing unit 240 of this embodiment can perform processing related to various control signals to be transmitted to the gNB100, such as capability information of the UE200, including UE Capability.

[0033] Specifically, the control signal / reference signal processing unit 240 can include in the capability information of the UE200 the frequency bands that the modulation / demodulation unit 230 can select, i.e., the frequency bands that can be switched to the anchor band. For example, as shown in Figure 7, the capability information of the UE200 can include a table showing which of the four frequency bands, Bands A, B, C, and D, can be switched to the anchor band. The capability information of the UE200, including the selectable frequency bands, can be transmitted as a wireless signal to the gNB100 by the transmitting unit of the wireless signal transceiver unit 210.

[0034] The selectable frequency bands (frequency bands that can be switched to the Anchor band) to be included in the UE200's capability information may, for example, be all frequency bands that the UE200 can transmit on. Alternatively, they may be frequency bands that are pre-configured on the UE200 as targets for Tx switching.

[0035] Furthermore, if there are two or more band combinations, which are sets of frequency bands that the UE200 can select, as described above, only the frequency bands common to the two or more band combinations may be included in the UE200's capability information as selectable frequency bands.

[0036] The number of selectable frequency bands to be included in the UE200 capability information may be one or more for each band combination. Using the table shown in Figure 7 as an example, if Bands A, B, C, and D are considered as one band combination, the indices may be 1-4 or 5-14. Furthermore, even when a common frequency band is selected for two or more band combinations, the number of selectable frequency bands may be one or more.

[0037] The control signal / reference signal processing unit 240 of this embodiment can perform processing related to various control signals transmitted from the gNB100. The various control signals transmitted from the gNB100 include information that notifies the frequency band selected by the modulation / demodulation unit 230. This information notifying the frequency band selected by the modulation / demodulation unit 230 can be received as a wireless signal by the receiving unit of the wireless signal transmitting / receiving unit 210.

[0038] In other words, the control signal / reference signal processing unit 240 causes the modulation / demodulation unit 230 to select and switch frequency bands based on information notifying the modulation / demodulation unit 230 of the frequency band to be selected by the modulation / demodulation unit 230. The following describes in detail the various control signals transmitted from the gNB100. Examples of the various control signals transmitted from the gNB100 include the RRC control signal, the MAC (Medium Access Control) control signal, and the DCI (Downlink Control Information).

[0039] When using RRC control signals, for example, a new RRC parameter may be defined, and this RRC parameter may include the index of the table shown in Figure 7. This allows the gNB100 to notify the frequency band to be selected by the modulation / demodulation unit 230. The table shown in Figure 7 is assumed to be stored in the UE200.

[0040] When using MAC control signals, for example, a new MAC CE (Control Element) may be defined, and this MAC CE may include the index of the table shown in Figure 7 to notify the modulation / demodulation unit 230 of the frequency band to be selected. Alternatively, as shown in Figure 8, the frequency band to be selected by the modulation / demodulation unit 230 may be notified by each bit of the newly defined MAC CE. For example, bits C1, C2, C3, and C4 shown in Figure 8 may be assigned to Bands A, B, C, and D respectively, with each bit being 0 indicating a frequency band that is not selected, and each bit being 1 indicating a frequency band that is selected.

[0041] When using DCI, for example, a new DCI field may be defined, and this DCI field may include the index of the table shown in Figure 7 to notify the frequency band to be selected by the modulation / demodulation unit 230. The bit length of the newly defined DCI field may be set dynamically by RRC, or it may be set statically based on the number of selectable frequency bands or the number of anchor bands. The bits of the newly defined DCI field may also be called codepoints. A codepoint may correspond to, for example, the index of the table shown in Figure 7.

[0042] When using DCI, for example, the frequency band to be selected by the modulation / demodulation unit 230 may be notified by including the index of the table shown in Figure 7 in an existing DCI field. For example, the frequency band to be selected by the modulation / demodulation unit 230 may be notified by including the index of the table shown in Figure 7 in one or more of DCI Format 1_0, DCI Format 1_1, DCI Format 1_2, DCI Format 0_0, DCI Format 0_1, and DCI Format 0_2.

[0043] The control signal / reference signal processing unit 240 of the embodiment may set the time from when the modulation / demodulation unit 230 selects a frequency band until it switches to a frequency band to which it transmits the radio signal. This time may be, for example, one or more of the following: Length of switching period, Time mask RF requirements, Uplink interruption and downlink interruption (RRM) requirements. Furthermore, the time set when switching the frequency band to which the radio signal is transmitted to an anchor band may be set differently from the time set when switching to a frequency band that is not an anchor band. For example, the former time may be set to be shorter than the latter time.

[0044] The control signal / reference signal processing unit 240 of this embodiment can group the frequency bands that the modulation / demodulation unit 230 can select. This grouping by the control signal / reference signal processing unit 240 may be achieved, for example, by setting a Group ID for the frequency bands that the modulation / demodulation unit 230 can select. The control signal / reference signal processing unit 240 can also set each group to be active or inactive.

[0045] The grouping by the control signal / reference signal processing unit 240 will be explained with reference to Figure 9. In Figure 9, as an example, it is explained that the modulation / demodulation unit 230 can select from six frequency bands: Bands A, B, C, D, E, and F.

[0046] As shown in Figure 9, the control signal / reference signal processing unit 240 groups Bands A and B into Group 1, Bands C and D into Group 2, and Bands E and F into Group 3. Furthermore, the control signal / reference signal processing unit 240 sets Groups 1 and 2 to active and Group 3 to inactive.

[0047] The control signal / reference signal processing unit 240 groups the selectable frequency bands for the modulation / demodulation unit 230. When each group is set to active or inactive, the modulation / demodulation unit 230 switches the frequency band to which it transmits radio signals in the frequency bands within the group that is set to active. In other words, the modulation / demodulation unit 230 does not switch the frequency band to which it transmits radio signals in the frequency bands within the group that is set to inactive. Furthermore, the UE200 may perform scheduling related to UL transmission only in Bands A, B, C, and D, which are the frequency bands within the group that is set to active. In other words, the UE200 does not need to consider (or ignore) scheduling related to UL transmission in Bands E and F, which are the frequency bands within the group that is set to inactive.

[0048] The control signal / reference signal processing unit 240 can include the number of groups that can be grouped in the capability information of UE200. The number of groups that can be grouped may be defined for each band combination, or if there are two or more band combinations as described above, it may be defined as a number common to two or more band combinations. The capability information of UE200, including the number of groups that can be grouped, can be transmitted as a wireless signal to gNB100 by the transmitting unit of the wireless signal transceiver unit 210.

[0049] As described above, the control signal / reference signal processing unit 240 can perform processing related to various control signals transmitted from the gNB100. The various control signals transmitted from the gNB100 include information that notifies the group to be set as active or inactive by the control signal / reference signal processing unit 240. This information notifying the group to be set as active or inactive by the control signal / reference signal processing unit 240 can be received as a wireless signal by the receiving unit of the wireless signal transmitting / receiving unit 210.

[0050] In other words, the control signal / reference signal processing unit 240 causes the modulation / demodulation unit 230 to switch frequency bands based on information that notifies the group to be set to active or inactive. The following describes in detail the various control signals transmitted from the gNB100. Examples of the various control signals transmitted from the gNB100 include the RRC control signal, the MAC (Medium Access Control) control signal, and the DCI (Downlink Control Information).

[0051] When using RRC control signals, for example, a new RRC parameter may be defined, and this RRC parameter may include, for example, the index of the table shown in Figure 10. The number of indexes in the table shown in Figure 10 may be statically set as 2 to the power of (number of groups) minus 1. For example, if the number of groups is 3, the number of indexes in the table is 2 to the power of 3 minus 1 = 7. This allows the gNB100 to notify the group that the control signal / reference signal processing unit 240 will set to active or inactive. The table shown in Figure 10 is assumed to be stored in the UE200.

[0052] When using MAC control signals, for example, a new MAC CE (Control Element) may be defined, and this MAC CE may include the index of the table shown in Figure 10 to notify the control signal / reference signal processing unit 240 of the group to be set as active or inactive. Alternatively, as shown in Figure 8, each bit of the newly defined MAC CE may be used to notify the control signal / reference signal processing unit 240 of the group to be set as active or inactive. For example, bits C1, C2, and C3 shown in Figure 8 may be assigned to Groups 1, 2, and 3, respectively, with each bit being 0 indicating a group to be set as inactive, and each bit being 1 indicating a group to be set as active.

[0053] When using DCI, for example, a new DCI field may be defined, and this DCI field may include the index of the table shown in Figure 10, notifying the control signal / reference signal processing unit 240 of the group to be set as active or inactive. The bit length of the newly defined DCI field may be set dynamically by RRC or statically based on the number of groups that can be grouped. The bits of the newly defined DCI field may also be called codepoints. A codepoint may correspond to the index of the table shown in Figure 10, for example.

[0054] When using DCI, for example, the control signal / reference signal processing unit 240 may notify the group to be set as active or inactive by including the index of the table shown in Figure 10 in an existing DCI field. For example, the control signal / reference signal processing unit 240 may notify the group to be set as active or inactive by including the index of the table shown in Figure 10 in one or more of DCI Format 1_0, DCI Format 1_1, DCI Format 1_2, DCI Format 0_0, DCI Format 0_1, and DCI Format 0_2.

[0055] The grouping by the control signal / reference signal processing unit 240 may be combined with the selection of frequency bands by the modulation / demodulation unit 230. Specifically, the modulation / demodulation unit 230 may select at least one frequency band from among the frequency bands within each group. For example, one anchor band may be selected within the frequency bands of each group, or two or more anchor bands may be selected within the frequency bands of each group. Alternatively, no anchor band may be selected within the frequency bands of each group.

[0056] Furthermore, if the frequency band used to transmit the radio signal is not the selected frequency band, the modulator / demodulator 230 may switch the frequency band used to transmit the radio signal to the selected frequency band within the same group. This will be explained below with reference to Figure 11.

[0057] In Figure 11, the control signal / reference signal processing unit 240 groups Bands A and B into Group 1, and Bands B, C, and D into Group 2. Furthermore, the modulation / demodulation unit 230 selects Band A as the anchor band in Group 1 and Band C as the anchor band in Group 2. If the frequency band to which the radio signal is transmitted is Band B, which is not an anchor band, the modulation / demodulation unit 230 switches the frequency band to which the radio signal is transmitted to Band A, which is an anchor band within the same group as Band B. Furthermore, the UE200 may perform scheduling related to UL transmission only in Band B, which was the frequency band before the switch, and Band A, which is an anchor band within the same group. In other words, the UE200 does not need to consider (or can ignore) scheduling related to UL transmission in other frequency bands, such as Bands C and D, which are frequency bands in different groups.

[0058] Furthermore, if the frequency band used to transmit the radio signal is the selected frequency band, the modulator / demodulator 230 may switch the frequency band used to transmit the radio signal to a selected frequency band within the same group or a different group. The following explanation will be given with reference to Figures 12 to 14.

[0059] In Figure 12, the control signal / reference signal processing unit 240 groups Bands A and B into Group 1, and Bands C and D into Group 2. Furthermore, the modulation / demodulation unit 230 selects Band A as the anchor band in Group 1 and Band C as the anchor band in Group 2. Here, assuming that the frequency band to which the radio signal is transmitted is Band A, which is the anchor band, the modulation / demodulation unit 230 switches the frequency band to which the radio signal is transmitted to either Band B, which is in the same group as Band A, or Band C, which is an anchor band in a different group than Band A. Furthermore, the UE200 may perform scheduling related to UL transmission only in Bands A and B, which are in the same group, and Band C, which is an anchor band in a different group. In other words, the UE200 does not need to consider (or can ignore) scheduling related to UL transmission in Band D, which is a frequency band that is not an anchor band in a different group.

[0060] In Figure 13, the control signal / reference signal processing unit 240 groups Bands A and B into Group 1, Bands C and D into Group 2, Bands E and F into Group 3, and Bands G and H into Group 4. Furthermore, the modulation / demodulation unit 230 selects Band A as the anchor band in Group 1, Band C as the anchor band in Group 2, Band E as the anchor band in Group 3, and Band G as the anchor band in Group 4. If the frequency band to which the radio signal is transmitted is Band A, which is the anchor band, the modulation / demodulation unit 230 switches the frequency band to which the radio signal is transmitted to either Band B, which is in the same group as Band A, or Bands C, E, and G, which are anchor bands in different groups than Band A. Furthermore, UE200 may only schedule UL transmissions in Bands A and B, which are frequency bands within the same group, and in Bands C, E, and G, which are anchor bands within different groups. In other words, UE200 does not need to consider (or can ignore) scheduling for UL transmissions in Bands D, F, and H, which are frequency bands that are not anchor bands within different groups.

[0061] In Figure 14, the control signal / reference signal processing unit 240 groups Bands A, B, and C into Group 1, Bands D, E, and F into Group 2, and Bands G and H into Group 3. Furthermore, the modulation / demodulation unit 230 selects Band A as the anchor band in Group 1, Band D as the anchor band in Group 2, and Band G as the anchor band in Group 3. Here, assuming that the frequency band to which the radio signal is transmitted is Band A, which is the anchor band, the modulation / demodulation unit 230 switches the frequency band to which the radio signal is transmitted to either Band B, which is in the same group as Band A, or Bands D and G, which are anchor bands in different groups than Band A. Furthermore, the UE200 may perform scheduling related to UL transmission only in Bands A and B, which are in the same group, and Bands D and G, which are anchor bands in different groups. In other words, the UE200 does not need to consider (or can ignore) scheduling related to UL transmission in Bands E, F, and H, which are non-Anchor band frequency bands within different groups.

[0062] The grouping by the control signal / reference signal processing unit 240 may be combined with the counting by the modulation / demodulation unit 230. Specifically, the modulation / demodulation unit 230 may count using different count values ​​for each group, or it may count using a common count value for all groups. Furthermore, if different count values ​​are used for each group, there may be groups that are not counted.

[0063] The control signal / reference signal processing unit 240 performs processing related to reference signals (RS), such as the Demodulation Reference Signal (DMRS) and the Phase Tracking Reference Signal (PTRS).

[0064] The encoding / decoding unit 250 performs data splitting / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or other gNB).

[0065] Specifically, the encoding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into predetermined sizes and performs channel coding on the divided data. The encoding / decoding unit 250 also decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0066] The data transmission / reception unit 260 performs the transmission and reception of Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmission / reception unit 260 performs assembly / decomposition of PDUs / SDUs at multiple layers (such as the Media Access Control (MAC) layer, Radio Link Control (RLC) layer, and Packet Data Convergence Protocol (PDCP) layer). In addition, the data transmission / reception unit 260 performs error correction and retransmission control of data based on HARQ (Hybrid Automatic Repeat Request).

[0067] The control unit 270 controls each functional block that constitutes the UE200. In other words, the functions of the control unit according to the claim are realized by each functional block that constitutes the UE200, such as the modulation / demodulation unit 230 and the control signal / reference signal processing unit 240 of the embodiment.

[0068] (3) Operation of the wireless communication system The operation of the wireless communication system 10 will be described. Specifically, the operation of selecting a frequency band to transmit wireless signals using the UE200, switching the frequency band to which wireless signals are transmitted to the selected frequency band, and grouping the frequency bands to which wireless signals are transmitted will be described.

[0069] (3.1) Challenges To improve the throughput of UL transmission from the UE200, switching between three or more frequency bands for transmitting radio signals is being considered. However, having more than three frequency band options for transmitting radio signals may increase the load on the UE200.

[0070] (3.2) Example of operation (3.2.1) Example of operation 1 The UE200 switches the frequency band to which it transmits radio signals to the gNB100. Specifically, the modulator / demodulator 230 first selects at least one frequency band from three or more frequency bands to which it can transmit radio signals. The selected frequency band is also called the anchor band. The frequency band selected by the modulator / demodulator 230 is notified, for example, by information received from the gNB100. The information notifying the selected frequency band is included in one of the RRC parameter, MAC CE, or DCI, for example, as a table as shown in Figure 7. The UE200 can also include the frequency bands that it can select in its capability information, for example as a table as shown in Figure 7, and transmit this capability information to the gNB100.

[0071] Next, the modulation / demodulation unit 230 switches the frequency band to which the radio signal is transmitted to the selected frequency band. The control signal / reference signal processing unit 240 may set the time from when the modulation / demodulation unit 230 selects a frequency until the frequency band to which the radio signal is transmitted to the selected frequency band is switched. This time may be one or more of the following, for example, Length of switching period, Time mask RF requirements, and Uplink interruption and downlink interruption (RRM) requirements.

[0072] Finally, the transmitting unit of the wireless signal transceiver unit 210 transmits a wireless signal to the gNB100 in the frequency band switched by the modulation / demodulation unit 230.

[0073] (3.2.2) Example of operation 2 Here, we will explain the case in the above-described example 3.2.1 where the frequency band before switching was the selected frequency band, i.e., the Anchor band. In this case, the modulation / demodulation unit 230 may switch the frequency band to which the radio signal is transmitted to any of the selectable frequency bands. Furthermore, if the modulation / demodulation unit 230 switches the frequency band to which the radio signal is transmitted to a frequency band other than the Anchor band, it may start counting using a function such as a timer, as shown in Figure 6. After the count expires, the modulation / demodulation unit 230 may switch the frequency band to which the radio signal is transmitted to the Anchor band.

[0074] (3.2.3) Example of operation 3 The UE200 switches the frequency band to which it transmits wireless signals to the gNB100. Specifically, the control signal / reference signal processing unit 240 first groups three or more frequency bands to which wireless signals can be transmitted into multiple groups. The control signal / reference signal processing unit 240 also sets each group to active or inactive. The group that the control signal / reference signal processing unit 240 sets to active is notified, for example, by information received from the gNB100. The information notifying which group to set to active is included in one of the RRC parameter, MAC CE, or DCI, for example, as a table as shown in Figure 10. The UE200 can also include the number of groups that it can group in its capability information and transmit this capability information to the gNB100.

[0075] Next, the modulation / demodulation unit 230 switches the frequency band to which the radio signal is transmitted to the frequency band within the group that is set to be actively configured. Here, the destination frequency band can be any of the frequency bands within the group that is set to be actively configured. The control signal / reference signal processing unit 240 may set the time from when the modulation / demodulation unit 230 selects a frequency until the frequency band to which the radio signal is transmitted to the selected frequency band is switched. This time may be one or more of the following, for example, Length of switching period, Time mask RF requirements, Uplink interruption and downlink interruption (RRM) requirements.

[0076] Finally, the transmitting unit of the wireless signal transceiver unit 210 transmits a wireless signal to the gNB100 in the frequency band switched by the modulation / demodulation unit 230.

[0077] (3.2.4) Example of operation 4 Here, we will explain with reference to Figure 11 the case in the operation example 3.2.3 described above, where the modulation / demodulation unit 230 selects a frequency band from among the frequency bands within each group grouped by the control signal / reference signal processing unit 240.

[0078] In Figure 11, the modulation / demodulation unit 230 selects Band A from Group 1, which groups Bands A and B, and Band C from Group 2, which groups Bands C and D. That is, Bands A and C become anchor bands. The frequency band for transmitting the radio signal is Band B, which is not an anchor band. In this case, the modulation / demodulation unit 230 switches the frequency band for transmitting the radio signal to Band A, which is an anchor band within Group 1, the same group as Band B, which is the frequency band for transmitting the radio signal. Then, the transmitting unit of the radio signal transceiver unit 210 transmits the radio signal to the gNB100 in the frequency band switched by the modulation / demodulation unit 230.

[0079] (3.2.5) Example of operation 5 Here, we will explain the case in the above-described example 3.2.4 where the frequency band used to transmit the wireless signal is Band A, which is the Anchor band, with reference to Figure 12.

[0080] In Figure 12, the modulator / demodulator 230 selects Band A from Group 1, which groups Bands A and B, and Band C from Group 2, which groups Bands C and D. That is, Bands A and C become anchor bands. The frequency band to which the radio signal is transmitted is Band A, which is an anchor band. In this case, the modulator / demodulator 230 switches the frequency band to which the radio signal is transmitted, either to Band B, which is in the same group as Band A (Band A) in Group 1, or to Band C, which is an anchor band in Group 2 (a different group from Band A). The transmitter of the radio signal transceiver 210 then transmits the radio signal to the gNB100 in the frequency band switched by the modulator / demodulator 230.

[0081] (4) Action and Effects The UE200 in the above-described embodiment selects at least one frequency band from three or more frequency bands capable of transmitting wireless signals, and switches the frequency band to which the wireless signal is transmitted to the selected frequency band. This allows the frequency band to be narrowed down to the selected frequency band, thereby suppressing an increase in the load on the UE200.

[0082] Furthermore, the UE200 in the above-described embodiment groups three or more frequency bands capable of transmitting wireless signals into multiple groups, and switches the frequency band to which wireless signals are transmitted to the frequency band within the group that is set as active. This allows the frequency band to be switched to be limited to the frequency band within the group that is set as active, thereby suppressing an increase in the load on the UE200.

[0083] Here, at least one frequency band within each group may be selected. In this case, if the frequency band on which the radio signal is transmitted is not one of the selected frequency bands, the UE200 may switch the frequency band on which the radio signal is transmitted to one of the selected frequency bands within the same group as the frequency band on which the radio signal is transmitted. This limits the frequency bands to which the UE200 can be switched to selected frequency bands within the same group, thereby suppressing the increase in load on the UE200.

[0084] Alternatively, if the frequency band used to transmit the wireless signal is the selected frequency band, the UE200 may switch the frequency band used to transmit the wireless signal to either a frequency band within the same group as the selected frequency band or a selected frequency band within a different group. This limits the frequency bands that can be switched to to those within the same group and those in different groups, thereby suppressing the increase in the load on the UE200.

[0085] (5) Other embodiments Although the present invention has been described above in accordance with the embodiments, 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.

[0086] In the disclosure described above, the Anchor band is notified by information transmitted from the gNB100, but is not limited to this. For example, the frequency band to which the UE200 transmits radio signals by default may be designated as the Anchor band. Similarly, the active group may also be set by default in the UE200. This allows the UE200 to narrow down the frequency band to which it switches, even without being notified by information transmitted from the gNB100.

[0087] The frequency bands in the above disclosure may be interpreted as Component Carriers (CCs). That is, one frequency band may contain one CC, and switching between frequency bands may be interpreted as switching between CCs. Furthermore, one frequency band may contain two or more CCs. In this case, switching occurs from one of the CCs in one frequency band to one of the CCs in another frequency band.

[0088] In the disclosure described above, frequency bands were grouped and then frequency bands were selected within each group, but this is not limited to this method. For example, multiple frequency bands may be selected, and then the groups may be formed to include the selected frequency bands.

[0089] In the disclosure described above, the control signal / reference signal processing unit 240 of the UE200 groups frequency bands and sets each group to be active or inactive based on information received from the gNB100, but it is not limited to this. For example, the gNB100 may group frequency bands and set each group to be active or inactive. In this case, the modulator / demodulator 230 of the UE200 may select a frequency band for transmitting a radio signal from the frequency bands within the active group set by the gNB100, according to the information received from the gNB100 regarding grouping and the active setting of each group.

[0090] The examples of operation described above may be combined and applied in combination, as long as no inconsistencies arise.

[0091] In the disclosures described above, configure, activate, update, indicate, enable, specify, and select may be interpreted as interchangeable. Similarly, link, associate, correspond, and map may be interpreted as interchangeable, and allocate, assign, monitor, and map may also be interpreted as interchangeable.

[0092] Furthermore, "specific," "dedicated," "UE specific," and "UE individual" may be interpreted interchangeably. Similarly, "common," "shared," "group-common," "UE common," and "UE shared" may be interpreted interchangeably.

[0093] The block diagram (Figure 3) used in the description of the above-mentioned embodiments shows functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the above one device or the above multiple devices with software.

[0094] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In any case, as mentioned above, the method of implementation is not particularly limited.

[0095] Furthermore, the gNB100 and UE200 (the device) described above may function as a computer that processes the wireless communication method of this disclosure. Figure 15 shows an example of the hardware configuration of the device. As shown in Figure 15, the device may be configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, and bus 1007.

[0096] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the device may include one or more of the devices shown in the diagram, or it may be configured to omit some of the devices.

[0097] Each functional block of the device (see Figure 3) is implemented by any hardware element of the computer device, or a combination of such hardware elements.

[0098] Furthermore, each function in the device is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of data reading and writing in the memory 1002 and storage 1003.

[0099] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, and so on.

[0100] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. Moreover, the above-mentioned various processes may be executed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0101] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store a program (program code), software modules, etc., that can execute a method according to one embodiment of this disclosure.

[0102] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. Storage 1003 may also be called an auxiliary storage device. The recording medium described above may also be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0103] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, network controller, network card, communication module, etc.

[0104] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0105] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0106] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0107] Furthermore, the device may include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented by such hardware. For example, processor 1001 may be implemented using at least one of these hardware components.

[0108] Furthermore, notification of information is not limited to the embodiments / models described herein and may be carried out by other means. For example, notification of information may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. RRC signaling may also be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0109] Each aspect / embodiment described herein may be applied to at least one of the following: 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®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other appropriate systems, as well as next-generation systems extended based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0110] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0111] The specific operations described in this disclosure as being performed by a base station may, in some cases, be performed by its upper node. 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 can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates a case where there is one other network node besides the base station, it may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0112] Information and signals (such as data) can be output from a higher layer (or lower layer) to a lower layer (or higher layer). Input and output may occur via multiple network nodes.

[0113] The input and output information may be stored in a specific location (e.g., memory) or managed using a management table. The input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0114] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0115] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0116] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0117] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0118] The information, signals, etc. described in this disclosure may be represented using any of the various different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0119] In addition, terms used 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 the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0120] The terms “system” and “network” as used in this disclosure are interchangeable.

[0121] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0122] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not restrictive in any way.

[0123] 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" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0124] A base station can house one or more (e.g., three) cells (also called sectors). When a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0125] The terms "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base stations and base station subsystems that provide communication services in this coverage.

[0126] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0127] 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 several other appropriate terms.

[0128] 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 be a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0129] Furthermore, the term "base station" in this disclosure may be interpreted as "mobile station" (user terminal, hereinafter the same). For example, each aspect / embodiment of this 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), Vehicle-to-Everything (V2X), etc.). In this case, the mobile station may have the functions that a base station has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc. may be interpreted as side channel.

[0130] Similarly, the term "mobile station" in this disclosure may be interpreted as "base station." In this case, the base station may be configured to have the functions that a mobile station has.

[0131] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe.

[0132] A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0133] Numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerology may include, for example, 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 configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0134] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). A slot may also be a time unit based on neurology.

[0135] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots 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.

[0136] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0137] 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. In other words, at least one of a subframe and a 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.

[0138] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0139] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0140] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0141] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0142] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0143] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0144] Furthermore, the time domain of the RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0145] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0146] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0147] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology on a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs are defined within a BWP and may be numbered within that BWP.

[0148] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be configured within a single carrier for a UE.

[0149] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0150] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless 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, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0151] The terms “connected,” “coupled,” or any variation thereof, mean 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” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0152] The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0153] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0154] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0155] Any reference to elements using designations such as “First,” “Second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the First and Second elements do not imply that only two elements may be employed therein, or that the First element must precede the Second element in any way.

[0156] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0157] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0158] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0159] In this 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 "combine" may be interpreted similarly to "different."

[0160] Figure 16 shows an example of the configuration of vehicle 2001. As shown in Figure 16, vehicle 2001 comprises a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012, and a communication module 2013.

[0161] The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

[0162] The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel performed by the user.

[0163] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2027 installed in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0164] Signals from various sensors 2021-2028 include current signals from the current sensor 2021 that senses motor current, front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0165] The Information Services Unit 2012 consists of various devices for providing various types of information, such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of Vehicle 1.

[0166] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System)), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0167] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 1 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 between the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 2028 provided in the vehicle 2001.

[0168] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0169] The communication module 2013 transmits current signals from current sensors input to the electronic control unit 2010 to an external device via wireless communication. The communication module 2013 also transmits, via wireless communication, other signals input to the electronic control unit 2010, including front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0170] The communication module 2013 receives various information (traffic information, signal information, distance information, etc.) transmitted from external devices and displays it on the information service unit 2012 installed in the vehicle. The communication module 2013 also stores the various information received from external devices in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, axles 2009, sensors 2021-2028, etc., installed in the vehicle 2001.

[0171] <Note> The terminal or wireless communication method of the embodiment may be configured as one of the terminals or wireless communication methods described in the following sections. (Section 1) A transmitting unit that transmits wireless signals to a base station, A control unit that selects at least one frequency band from three or more frequency bands capable of transmitting the aforementioned wireless signal, and switches the frequency band to which the wireless signal is transmitted to the selected frequency band, A terminal equipped with the following features. (Section 2) The transmitting unit transmits terminal capability information, including selectable frequency bands, to the base station. The terminal according to claim 1. (Section 3) The system includes a receiving unit that receives information from the base station indicating the frequency band to be selected. The aforementioned information is included in either the RRC (Radio Resource Control) parameter, MAC CE (Medium Access Control Control Element), or DCI (Downlink Control Information). The terminal according to claim 1 or 2. (Section 4) The control unit sets the time until the frequency band for transmitting the wireless signal is switched. The terminal according to any one of claims 1 to 3. (Section 5) The control unit starts counting if the frequency band to which the radio signal is transmitted is not the selected frequency band, and after the counting is completed, switches the frequency band to which the radio signal is transmitted to the selected frequency band. The terminal according to any one of claims 1 to 4. (Section 6) The steps include selecting at least one frequency band from three or more frequency bands capable of transmitting wireless signals, A step of switching the frequency band to which the radio signal is transmitted to the selected frequency band, The steps include transmitting the radio signal to the base station, A wireless communication method that includes the following features.

[0172] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure may be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Accordingly, the descriptions in the present disclosure are for illustrative purposes only and are not intended to be restrictive in any way. [Explanation of Symbols]

[0173] 10 Wireless communication systems 20 NG-RAN 100 gNB 200 UE 210 Wireless signal transmission and reception unit 220 Amplifier section 230 Modulation / Demodulation Section 240 Control signal / reference signal processing unit 250 Encoding / Decoding Unit 260 Data transmission / reception unit 270 Control Unit 1001 Processor 1002 memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive Unit 2003 Steering Department 2004 Accelerator pedal 2005 Brake pedal 2006 Shift Lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 Rotation speed sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Accelerometer 2026 Brake Pedal Sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driver Support Systems Department 2031 Microprocessor 2032 memory (ROM, RAM) 2033 Communication Port

Claims

1. A transmitting unit that transmits wireless signals to a base station, The system includes a control unit which selects at least one frequency band from three or more frequency bands capable of transmitting the aforementioned wireless signal, and switches the frequency band to which the wireless signal is transmitted to the selected frequency band, The control unit sets the time from selecting the frequency band to switching the frequency band to which the radio signal is transmitted to the selected frequency band. Terminal.

2. The transmitting unit transmits terminal capability information, including selectable frequency bands, to the base station. The terminal according to claim 1.

3. The system includes a receiving unit that receives information from the base station indicating the frequency band to be selected. The aforementioned information is included in either the RRC (Radio Resource Control) parameter, MAC CE (Medium Access Control Element), or DCI (Downlink Control Information). The terminal according to claim 1.

4. The control unit starts counting if the frequency band to which the radio signal is transmitted is not the selected frequency band, and after the counting is completed, switches the frequency band to which the radio signal is transmitted to the selected frequency band. The terminal according to claim 1.

5. The steps include selecting at least one frequency band from three or more frequency bands capable of transmitting wireless signals, A step of switching the frequency band to which the radio signal is transmitted to the selected frequency band, The steps include transmitting the radio signal to the base station, A step of setting the time from selecting the frequency band to switching the frequency band to which the wireless signal is transmitted to the selected frequency band, A wireless communication method that includes the following features.

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