Base stations and communication methods

Abstract

A communication device that has a transmission unit that transmits a signal to another communication device in an autonomously selected resource to request transmission of a sounding reference signal (SRS), a reception unit that receives the SRS from the other communication device, and a control unit that performs a measurement that uses the SRS.

Description

Technical Field

[0001] The present invention relates to base station and a communication method in a wireless communication system.

Background Art

[0002] In 3GPP (3rd Generation Partnership Project), in order to achieve further increase in system capacity, further increase in data transmission speed, further reduction in latency in the radio section, etc., a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless communication method is referred to as "NR") is being studied. In 5G, in order to meet the requirement of achieving a throughput of 10 Gbps or more and reducing the latency in the radio section to 1 ms or less, various wireless technologies and network architectures are being studied (for example, Non-Patent Document 1).

[0003] Furthermore, the study of 6G as the next-generation wireless communication method after 5G has been started, and the realization of wireless quality exceeding 5G is expected. For example, in 6G, studies are being advanced toward the realization of further increase in capacity, use of new frequency bands, further reduction in latency, further high reliability, expansion of coverage in new areas (high altitude, sea, space), etc. (for example, Non-Patent Document 2).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] 6G is expected to utilize even higher frequencies than before to further improve communication speed, capacity, reliability, and latency performance. When using these higher frequencies, a wider bandwidth is available, and the radio waves exhibit high directivity and low frequency selectivity. Furthermore, they are characterized by large Doppler shift and high path loss.

[0006] Due to the characteristics of the frequency band utilizing these high frequencies, control rules different from conventional cell design or base station scheduling techniques may be more desirable from a network performance perspective. For example, since a lower probability of resource collisions is expected, a system in which terminals or base stations autonomously determine the resources used for transmission can be considered. It is necessary to define the method for requesting the transmission of SRS (Sounding reference signal) and the measurement method using SRS in such a system.

[0007] This invention has been made in view of the above points, and aims to improve transmission quality in a wireless communication system that autonomously determines the resources to be used by measuring the channel state and reporting the measurement results. [Means for solving the problem]

[0008] According to the disclosed technology, a signal is sent to an autonomously selected resource to request the transmission of an SRS (Sounding reference signal). terminal A transmitting unit that transmits the SRS to the terminal The transmitting unit comprises a receiving unit that receives signals from and a control unit that performs measurements using the SRS, and the transmitting unit is The aforementioned Information indicating the resources used for SRS transmission is associated with the same beam of the device. terminal multiple terminal Send base station It will be provided. [Effects of the Invention]

[0009] According to the disclosed technology, in a wireless communication system that autonomously determines the resources to be used, the channel state can be measured, the measurement results reported, and the transmission quality can be improved. [Brief explanation of the drawing]

[0010] [Figure 1] This figure illustrates an example (1) of a wireless communication system in an embodiment of the present invention. [Figure 2] This figure illustrates an example (2) of a wireless communication system in an embodiment of the present invention. [Figure 3] This figure shows an example of scheduling. [Figure 4] This figure shows an example of transmission and reception (1) in an embodiment of the present invention. [Figure 5] This figure shows an example (2) of transmission and reception in an embodiment of the present invention. [Figure 6] This figure shows an example (3) of transmission and reception in an embodiment of the present invention. [Figure 7] This figure shows an example of transmission and reception (4) in an embodiment of the present invention. [Figure 8] This figure shows an example (1) of a resource for CSI reporting in an embodiment of the present invention. [Figure 9] This figure shows an example (2) of a resource for CSI reporting in an embodiment of the present invention. [Figure 10] This figure shows an example of CSI reporting operation in an embodiment of the present invention. [Figure 11] This figure shows an example (1) of CSI report transmission and reception in an embodiment of the present invention. [Figure 12] This figure shows an example (2) of CSI report transmission and reception in an embodiment of the present invention. [Figure 13] This figure shows an example of the functional configuration of the base station 10 in an embodiment of the present invention. [Figure 14] This figure shows an example of the functional configuration of terminal 20 in an embodiment of the present invention. [Figure 15]It is a diagram showing an example of the hardware configuration of the base station 10 or the terminal 20 in an embodiment of the present invention.

Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies may be used as appropriate. The existing technologies are, for example, existing NR or LTE, but are not limited to existing NR or LTE.

[0013] FIG. 1 is a diagram for explaining an example (1) of a wireless communication system in an embodiment of the present invention. As shown in FIG. 1, the wireless communication system in an embodiment of the present invention includes a base station 10 and a terminal 20. In FIG. 1, one base station 10 and one terminal 20 are shown, but this is an example, and there may be a plurality of each.

[0014] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Also, the TTI (Transmission Time Interval) in the time domain may be a slot or a subframe.

[0015] The base station 10 can perform carrier aggregation in which a plurality of cells (a plurality of CCs (Component Carriers)) are bundled to communicate with the terminal 20. In carrier aggregation, one PCell (Primary Cell) and one or more SCells (Secondary Cells) are used.

[0016] The base station 10 transmits synchronization signals and system information to the terminal 20. Synchronization signals include, for example, NR-PSS and NR-SSS. System information is transmitted via, for example, NR-PBCH or PDSCH, and is also called broadcast information. As shown in Figure 1, the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Here, signals transmitted via control channels such as PUCCH and PDCCH are called control signals, and signals transmitted via shared channels such as PUSCH and PDSCH are called data, but this is just one example of terminology.

[0017] Terminal 20 is a communication device equipped with wireless communication capabilities, such as a smartphone, mobile phone, tablet, wearable device, or M2M (Machine-to-Machine) communication module. As shown in Figure 1, Terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. Terminal 20 may also be referred to as UE, and base station 10 as gNB.

[0018] Terminal 20 is capable of performing carrier aggregation, which involves bundling multiple cells (multiple CCs (component carriers)) together to communicate with base station 10. Carrier aggregation uses one PCell (primary cell) and one or more SCells (secondary cells). In addition, a PUCCH-SCell with a PUCCH may be used.

[0019] Figure 2 is a diagram illustrating an example (2) of a wireless communication system in an embodiment of the present invention. Figure 2 shows an example configuration of a wireless communication system when DC (Dual connectivity) is performed. As shown in Figure 2, a base station 10A that acts as an MN (Master Node) and a base station 10B that acts as an SN (Secondary Node) are provided. Base stations 10A and 10B are each connected to the core network. Terminal 20 can communicate with both base station 10A and base station 10B.

[0020] A cell group provided by base station 10A, which is the MN (Mobile Network Unit), is called an MCG (Master Cell Group), and a cell group provided by base station 10B, which is the SN (Stationary Network Unit), is called an SCG (Secondary Cell Group). In a data center, an MCG consists of one PCell and one or more SCells, and an SCG consists of one PSCell (Primary SCG Cell) and one or more SCells.

[0021] Furthermore, DC may be a communication method that utilizes two communication standards, and any combination of communication standards is acceptable. For example, the combination could be NR and 6G standards, or LTE and 6G standards. Also, DC may be a communication method that utilizes three or more communication standards, and may be called by a different name than DC.

[0022] The processing operations in this embodiment may be performed using the system configuration shown in Figure 1, the system configuration shown in Figure 2, or any other system configuration.

[0023] In 6G, it is anticipated that even higher frequencies will be used to further improve communication speed, capacity, reliability, and latency performance. When using these higher frequencies, a wide bandwidth is available, and the radio waves have the characteristics of high directivity and low frequency selectivity. They also have the characteristics of large Doppler shift and large path loss.

[0024] Due to the characteristics of the frequency band utilizing these high frequencies, control rules different from conventional cell design or base station scheduling techniques may be more desirable from a network performance perspective. For example, collision avoidance between DL-DL, DL-UL, and UL-UL, as well as interference reduction between cells, are assumed to be less necessary than with conventional lower frequencies.

[0025] Figure 3 shows an example of scheduling. In the example shown in Figure 3, beamforming at base station 10 is implemented analogously, and scheduling is performed for each beam using TDM (Time Division Multiplexing). As shown in Figure 3, beam #1 and beam #2 are multiplexed by TDM. In the example shown in Figure 3, base station 10 performs TDM scheduling for terminals 20A and 20B using beam #1, and terminal 20C using beam #2.

[0026] As control rules that do not rely on scheduling, i.e., control rules in which a communication device transmitting a signal autonomously selects resources, the following control rules A) and B) can be considered.

[0027] Control Rule A) The transmitting device will transmit signals at any time at both the base station 10 and the terminal 20. The receiving device must detect signals at all times when both the base station 10 and the terminal 20 can receive them. If a collision occurs in the resources used for transmission, the collision will be treated the same as a decoding error, and retransmission by feedback may be performed. In frequency bands that use higher frequencies than before, the beam is very narrow and the area is small, so the number of terminals 20 within a given beam is very small, and even if scheduling by the base station 10 is not performed, the probability of a collision in the resources used for transmission is expected to be low.

[0028] Control Rule B) The transmitting device acquires the right to transmit signals from both the base station 10 and the terminal 20. That is, the base station 10 and the terminal 20 transmit signals after performing in-system LBT (Listen before talk). The receiving device must detect signals at all times when both the base station 10 and the terminal 20 can receive them. Resource collisions used for transmission are avoided by in-system LBT. In frequency bands using higher frequencies than before, the probability of resource collisions is lower, and in addition, control rule B can detect resource collisions that rarely occur within the same beam or due to inter-cell interference in advance and operate to avoid collisions.

[0029] Both control rule A and control rule B can be used in cases with or without frame synchronization. Hereafter, the control rule with frame synchronization will be referred to as control rule A1 or control rule B1, and the control rule without frame synchronization will be referred to as control rule A2 or control rule B2.

[0030] In control rules A1, A2, B1, and B2 described above, the transmission procedure and signal detection procedure need to be considered. In addition, in control rules B1 and B2 described above, the in-system LBT needs to be considered. As elements of the in-system LBT, the transmission time, semi-static transmission without LBT, and avoidance of frequency resource collisions need to be considered. In addition, in control rules A2 and B2 described above, the preamble needs to be considered. In addition, in control rules A1 and B1 described above, blind detection of the control signal needs to be considered.

[0031] In the following, the transmitting node or receiving node shall correspond to either the base station 10 or the terminal 20.

[0032] Figure 4 shows an example (1) of transmission and reception in an embodiment of the present invention. The procedure relating to control rule A1 will be explained using Figure 4. In control rule A1, the operations 1)-4) shown below may be performed.

[0033] 1) The transmitting node may transmit a signal at a predetermined transmission timing. The transmitted signal may consist of at least one of a data signal, a control signal, and a reference signal. The predetermined transmission timing may be determined based on synchronized frames between the transmitting and receiving nodes.

[0034] 2) When a transmitting node transmits multiple signals in succession, the timing of transmissions other than the initial transmission may be determined based on the signal transmitted immediately before. For example, the transmission timing and transmission duration of transmissions other than the initial transmission may be instructed to the transmitting node, pre-set, notified to the receiving node, or pre-set. For example, the transmission timing of transmissions other than the initial transmission may be x symbols after the end of the immediately preceding transmission, y slots after the end of the immediately preceding transmission, z frames after the end of the immediately preceding transmission, or a combination of x, y, and z. For example, the transmission duration of transmissions other than the initial transmission may be L symbols from the x-th symbol to L symbol length for each slot.

[0035] In Figure 4, assuming the initial transmission is performed in slot #0, the transmission in slot #1 occurs one symbol after the end of the previously transmitted signal, and the transmission timing and duration are shown to be seven symbols long, starting from the 0th symbol of the slot.

[0036] 3) The receiving node may perform blind detection of the control signals. The resources or detection opportunities for the control signals (e.g., CORESET (Control resource set) or search space) may be specified in the specification or set or notified by the transmitting node. For example, in Figure 4, the receiving node performs blind detection of the control signals transmitted to the first two symbols of the slot.

[0037] 4) When the receiving node detects a control signal, it may demodulate the data signal. Based on the detection result of the control signal, the receiving node may identify the resources for the data and / or reference signal. For example, in Figure 4, when the receiving node detects a control signal transmitted to the first two symbols of a slot, it may demodulate the subsequent data signal and / or reference signal.

[0038] The correspondence between transmitting and receiving nodes is as follows: In the downlink, the transmitting node is base station 10 and the receiving node is terminal 20. In the uplink, the transmitting node is terminal 20 and the receiving node is base station 10. In the sidelink, the transmitting node is terminal 20 and the receiving node is terminal 20.

[0039] Figure 5 shows an example (2) of transmission and reception in an embodiment of the present invention. The procedure relating to control rule A2 will be explained using Figure 5. In control rule A2, the operations 1)-4) shown below may be performed.

[0040] 1) As shown in Figure 5, the transmitting node may transmit the transmit signal with a preamble signal attached. The transmit signal may consist of at least one of a data signal, a control signal, and a reference signal. The transmitting node may start transmitting at any time.

[0041] 2) When a transmitting node transmits multiple signals in succession, if the gap between the transmitted signals is less than or equal to a predetermined value, it does not need to provide a preamble signal for transmissions other than the first one. The predetermined value may be a threshold value. The transmission timing of signals other than the first one may be determined based on the immediately preceding transmitted signal. For example, the transmission of the next signal may start X milliseconds after the end of the immediately preceding transmitted signal.

[0042] 3) The receiving node may perform preamble signal detection. The receiving node may determine that a preamble has been detected when the received power of the preamble signal is equal to or exceeds a predetermined value.

[0043] 4) When the receiving node detects the preamble signal, it may demodulate the transmit signal. Based on the detection result of the preamble signal, the receiving node may identify the resources of the transmit signal. Based on the detection result of the preamble signal, the receiving node may identify the resources or detection opportunities (e.g., CORESET or search space) of the control signals and perform blind detection of the control signals. Furthermore, when the receiving node detects the control signals, it may demodulate the data signals. Based on the detection result of the control signals, the receiving node may identify the resources of the data and / or reference signals.

[0044] Figure 6 shows an example (3) of transmission and reception in an embodiment of the present invention. The procedure related to control rule B1 will be explained using Figure 6. In control rule B1, the operations 1)-4) shown below may be performed.

[0045] 1) The transmitting node may transmit a transmission signal when it has successfully performed LBT at a predetermined transmission timing. For example, as shown in Figure 6, LBT may be performed immediately before the slot in which the signal is to be transmitted. The transmission signal may consist of at least one of a data signal, a control signal, and a reference signal. The predetermined transmission timing may be determined based on frames synchronized between the transmitting and receiving nodes. LBT may perform power detection in a predetermined time interval immediately before transmitting the transmission signal, and determine success when the received power is less than or equal to a predetermined value. The predetermined value may be a threshold value. If LBT fails, LBT may be performed again immediately before the predetermined transmission timing. Alternatively, the timing for repeatedly performing LBT until LBT is successful may be specified in the specifications, or may be set or notified in advance by the receiving node. If the transmitting node performs LBT again and succeeds, it may transmit the same transmission signal as when LBT failed, or it may transmit a different transmission signal than when LBT failed.

[0046] 2) When a transmitting node transmits multiple transmission signals in succession, if the gap between transmission signals is less than or equal to a predetermined value, it does not need to perform LBT (Low-Block Testing) for transmissions other than the first one. That is, if the gap between a transmitted signal and the next transmitted signal is less than or equal to a predetermined value, the next transmitted signal may be transmitted without performing LBT. The predetermined value may be a threshold value. When a transmitting node transmits multiple transmission signals in succession, if LBT is successful, it may transmit without performing LBT for a predetermined period. When transmitting multiple transmission signals in succession, the transmission timing of signals other than the first one may be determined based on the immediately preceding transmission signal. When transmitting multiple transmission signals in succession, the transmission timing and transmission time of signals other than the first one may be instructed to the transmitting node, pre-set, notified to the receiving node, or pre-set. For example, the transmission timing of transmissions other than the first one may be x symbols after the end of the immediately preceding signal, y slots after the end of the immediately preceding signal, z frames after the end of the immediately preceding signal, or a combination of x, y, and z. For example, the transmission time for transmissions other than the initial transmission may be the length of L symbols, starting from the x-th symbol for each slot.

[0047] 3) The receiving node may perform blind detection of the control signals. The resources or detection opportunities for the control signals (e.g., CORESET or search space) may be specified in the specification or set or notified by the transmitting node. For example, in Figure 6, the receiving node performs blind detection of the control signals transmitted to the first two symbols of the slot.

[0048] 4) When the receiving node detects a control signal, it may demodulate the data signal. Based on the detection result of the control signal, the receiving node may identify the resources for the data and / or reference signal. For example, in Figure 6, when the receiving node detects a control signal transmitted to the first two symbols of a slot, it may demodulate the subsequent data signal and / or reference signal.

[0049] Figure 7 shows an example (4) of transmission and reception in an embodiment of the present invention. The procedure related to control rule B2 will be explained using Figure 7. In control rule B2, the operations 1)-4) shown below may be performed.

[0050] 1) The transmitting node may, upon successful LBT, add a preamble signal to the transmit signal and then perform transmission. For example, as shown in Figure 7, LBT may be performed immediately before transmitting the preamble signal. The transmit signal may consist of at least one of a data signal, a control signal, and a reference signal. The transmitting node may start LBT and transmission at any timing. LBT may perform power detection in a predetermined time interval immediately before transmitting the preamble signal, and determine success when the received power is less than or equal to a predetermined value. The predetermined value may be a threshold value. If LBT fails, LBT may be performed again immediately before any transmission timing. Alternatively, the timing for repeatedly performing LBT until success may be specified in the specifications, or may be set or notified in advance by the receiving node. If the transmitting node performs LBT again and succeeds, it may transmit the same transmit signal as when LBT failed, or it may transmit a different transmit signal than when LBT failed.

[0051] 2) When a transmitting node transmits multiple signals in succession, if the gap between the transmitted signals is less than or equal to a predetermined value, it does not need to add a preamble signal to transmissions other than the first transmission. The predetermined value may be a threshold value. When a transmitting node transmits multiple signals in succession, if the gap between the transmitted signals is less than or equal to a predetermined value, it does not need to perform LBT (Low Beam Testing) to transmissions other than the first transmission. The predetermined value may be a threshold value. When a transmitting node transmits multiple signals in succession, if LBT is successful, it may transmit without performing LBT for a predetermined period of time. When transmitting multiple signals in succession, the transmission timing of signals other than the first transmission may be determined based on the immediately preceding transmitted signal. For example, the transmission of the next signal may start X milliseconds after the end of the immediately preceding transmitted signal.

[0052] 3) The receiving node may perform preamble signal detection. The receiving node may determine that a preamble has been detected when the received power of the preamble signal is equal to or exceeds a predetermined value.

[0053] 4) When the receiving node detects the preamble signal, it may demodulate the transmit signal. Based on the detection result of the preamble signal, the receiving node may identify the resources of the transmit signal. Based on the detection result of the preamble signal, the receiving node may identify the resources or detection opportunities (e.g., CORESET or search space) of the control signals and perform blind detection of the control signals. Furthermore, when the receiving node detects the control signals, it may demodulate the data signals. Based on the detection result of the control signals, the receiving node may identify the resources of the data and / or reference signals.

[0054] In control rules A1, A2, B1, and B2 described above, feedback needs to be considered. For example, regarding CSI (Channel State Information) reporting, it is necessary to consider whether or not a trigger is present and how it is triggered, the definition, determination method and notification method of the measurement signal, the method for determining the report content and the procedure for sending the report.

[0055] In a system where a transmitting communication device autonomously determines the resources needed to transmit data to a receiving communication device, such as a base station 10 or a terminal 20, for example, in a system to which the above control rules A1, A2, B1, and B2 are applied, we propose one of the communication devices shown in 1)-4) below.

[0056] 1) Measure predetermined information based on signals received from a communication device, and transmit the information related to the measurement to the communication device. 2) Transmit a signal to a communication device and receive information related to the measurement based on the transmitted signal from the communication device. 3) Based on the signal received from the communication device, transmit a signal related to the measurement of predetermined information to the communication device. 4) Transmit a signal to a communication device and receive a signal from the communication device that corresponds to the transmitted signal and relates to the measurement of predetermined information.

[0057] The methods described in 1) and 2) above may be referred to as CSI measurement and reporting, and the signal used may be referred to as CSI-RS. The communication device that receives the information related to the measurement may be a communication device that transmits data, but is not limited to this; the communication device that receives data may also receive the information related to the measurement.

[0058] The methods described in 3) and 4) above may be called signal requests for CSI measurement, and the signal used may be called an SRS (Sounding reference signal). The communication device that receives the signal related to the measurement of the predetermined information may be a communication device that transmits data, but is not limited to this, and a communication device that receives data may also receive the signal related to the measurement of the predetermined information.

[0059] The above-described communication device allows the base station 10 or terminal 20 to autonomously select resources for DL, UL, or SL transmission, and to acquire channel status information necessary for determining the parameters used for transmission. In other words, it becomes possible to select appropriate transmission parameters, thereby improving frequency utilization efficiency and transmission quality.

[0060] Furthermore, since the embodiments of the present invention can be applied to any communication device (e.g., UL, DL, or SL) in a control rule for a communication device transmitting a signal to autonomously select resources, the base station 10 or terminal 20 will also be referred to as, for example, a transmitting node, a receiving node, or a communication device.

[0061] Note that the "Resource," "Time Interval," and "Window" may or may not include the LBT interval.

[0062] The information to be measured and the information related to the measurement may be any of the following 1)-3).

[0063] 1) Channel status. The channel status may include information relating to the target frequency, channel usage, interference power value or level, other detectable communication devices, and propagation characteristic measurements. For example, it may include CQI (Channel quality indicator), RI (Rank indicator), PMI (Precoding matrix indicator), LI (Layer indicator), RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator), or it may include information relating to LOS (Line of sight) and NLOS (Non-line of sight).

[0064] 2) Information relating to location. This information relating to location may include, for example, GNSS (Global Navigation Satellite System) information, latitude and longitude, altitude, area formation angle, information indicating which zone a plane belongs to when it is divided into predetermined zones, and signal arrival angle.

[0065] 3) The object of measurement. The object of measurement may be, for example, the type of signal, sequence, ID, or resource, or it may be information indicating which object of measurement was used to measure the corresponding CSI.

[0066] Hereinafter, the information measured or related to the measurement will be referred to as "CSI," but this is not limited to this. The CSI report may include the information measured or related to the measurement.

[0067] A node sends a CSI request, and the node that receives the CSI request reports the CSI to the node that sent the request. The method for requesting a CSI may be any of the following 1)-3).

[0068] 1) A CSI request may be transmitted in a signal related to a data transmission. The CSI request may be included in the data signal, control signal, reference signal, or preamble signal. For example, the control signal may contain information corresponding to the CSI request. For example, the CSI request may be transmitted by a sequence of reference signals or a sequence of preamble signals.

[0069] 2) Transmission of a CSI request without data transmission may be defined. A control signal, reference signal, or preamble signal containing the CSI request may be transmitted. The CSI request may be transmitted using the same transmission procedure as the data transmission to which control rules A1, A2, B1, or B2 above apply. In the case of control rule B1 or B2 above, LBT may be performed before the transmission of the signal containing the CSI request.

[0070] 3) A CSI report may be triggered if certain conditions are met. For example, if data is transmitted from node X to node Y, and a CSI request is received by node Y during the data transmission, node Y may trigger a CSI report to node X and send a CSI report to node X. For example, if data is transmitted from node X to node Y, node Y may trigger a CSI report to node X and send a CSI report to node X. In other words, the above CSI report may be triggered without an explicit CSI request.

[0071] For example, if data is transmitted from one node X to another node Y, and any of the following conditions a) b) c) are met, node Y may trigger a CSI report to node X and send a CSI report to node X. a) If data reception or decoding fails a predetermined number of times or within a predetermined time b) If the amount of resources used for data transmission, the MCS (Modulation and coding scheme), or the TBS (Transport block size) exceeds or falls below a predetermined value. c) When data transmission within a predetermined time resource is notified in advance.

[0072] Figure 8 shows an example (1) of a resource for CSI reporting in an embodiment of the present invention. As shown in Figure 8, a node requesting a CSI may specify a resource for CSI reporting to a node reporting a CSI. The specified resource may be indicated in a predetermined time unit (e.g., a slot), or in a predetermined time, frequency, or code unit (e.g., a symbol, PRB, cyclic shift, or OCC (Orthogonal Cover Code) index).

[0073] A node requesting a CSI may, based on a predetermined timing, designate at least one of a predetermined resource, such as time, frequency, code, and space, as a resource for CSI reporting. For example, the predetermined timing may be the synchronization timing and / or the timing of sending the CSI request in control rules A1 and B1, or it may be the timing of sending the CSI request in control rules A2 and B2.

[0074] Information indicating resources for CSI reporting may be shared with other nodes, and other nodes may use resources other than those indicated. It may be shared only among terminals 20 associated with the same base station 10 beam, or information related to the beam may be shared among those terminals 20 together. Information indicating resources for CSI reporting may be shared with multiple nodes by a single signal.

[0075] Based on the beam timing of the node reporting the CSI, the node requesting the CSI may specify a predetermined resource.

[0076] The resource for CSI reporting may be specified using a data signal, control signal, reference signal, or preamble signal (if control rules A2 and B2 above apply). The resource for CSI reporting may be specified using a data signal, control signal, reference signal, or preamble signal (if control rules A2 and B2 above apply) corresponding to the CSI report.

[0077] Figure 9 shows an example (2) of resources for CSI reporting in an embodiment of the present invention. As shown in Figure 9, a node reporting a CSI may send a CSI report to a node requesting a CSI using resources specified by that node. A node reporting a CSI may always send a CSI report to a node requesting a CSI using resources specified by that node.

[0078] Furthermore, if the resource specified by the node requesting the CSI is unavailable, the node reporting the CSI may use other resources to send the CSI report to the node requesting the CSI. For example, if there is another scheduled transmission or reception using the same time resource as the resource specified by the node requesting the CSI, the node reporting the CSI may determine that the specified resource is unavailable. For example, if, in control rule A2 or B2, preamble signal detection and decoding of related signals detect that at least a portion of the resource specified by the node requesting the CSI is being used by another node, the node reporting the CSI may determine that the specified resource is unavailable. For example, if, in control rule A2 or B2, preamble signal detection and decoding of related signals determine that a reception operation is to be performed on at least a portion of the resource specified by the node requesting the CSI, and simultaneous reception and transmission are not possible, the node reporting the CSI may determine that the specified resource is unavailable. For example, if LBT detects a signal from another node requesting a CSI and transmission on the resource specified by the node requesting the CSI is not possible, the node reporting the CSI may determine that the specified resource is unavailable. Furthermore, a node reporting a CSI may operate to send the CSI report until a predetermined time, and may cancel the CSI report if it fails to send it by the predetermined time.

[0079] Furthermore, if a node reporting a CSI is unavailable, it does not need to use any of the notified resources and therefore does not need to report a CSI.

[0080] A node reporting a CSI may autonomously determine the resource to use for CSI reporting. For example, the resource for CSI reporting could be any resource. In other words, there may be no constraints on the timing of CSI reporting.

[0081] Figure 10 shows an example of CSI reporting operation in an embodiment of the present invention. As shown in Figure 10, when a data receiving node autonomously determines resources for CSI reporting, the CSI reporting may be performed by a predetermined timing Tmax. Tmax may be defined by the specification, determined by a higher-layer parameter, determined by MAC-CE (Media Access Control - Control Element), determined by a control signal (e.g., DCI (Downlink Control Information) or UCI (Uplink Control Information)) or a preamble signal.

[0082] Tmax may have different values ​​depending on the circumstances. For example, Tmax may have different values ​​for each data receiving node, different values ​​depending on the frequency (e.g., band, carrier, cell), different values ​​depending on the service type or request (e.g., eMBB (enhanced Mobile Broadband), URLLC (Ultra-Reliable and Low Latency Communications)), or different values ​​depending on the priority (e.g., priority index, priority value, priority at the PHY layer, priority at the MAC layer). Additionally, Tmax may be applied based on the timing of the CSI request or the timing of the CSI trigger.

[0083] Furthermore, Tmax may be determined based on parameters related to LBT. That is, Tmax may be determined based on how much time is available to start transmission after receiving a CSI request. The parameters related to LBT may be the LBT time width or the LBT capability.

[0084] A set of resources for CSI reporting may be predefined, and a node reporting CSI may determine which CSI reporting resources to use from this set of resources. This set of resources may be combined with the data transmission resource set using TDM or FDM (Frequency Division Multiplexing).

[0085] A node requesting a CSI may notify the node of a list of preferred resources for CSI reporting, and a node reporting the CSI may autonomously select a resource for CSI reporting from among these preferred resources.

[0086] The resource candidate may also be a time window for CSI reporting, and the node reporting the CSI may autonomously select a resource for CSI reporting within that time window, as explained with reference to Figure 10.

[0087] The candidate resources may be multiple time and frequency resources for CSI reporting, and the node reporting the CSI may autonomously select the resource for CSI reporting from among these multiple time and frequency resources, as explained with reference to Figure 10.

[0088] A node reporting CSI may perform CSI reporting for the resource selected from the candidate resources, as explained using Figure 10.

[0089] A set of resources for CSI reporting may be predefined or configured. This set of resources may be configured from base station 10 to terminal 20, or a common configuration may be predetermined in the system. Resources for CSI requests or CSI measurement signals may be associated with resources for CSI reporting, or resources for CSI reporting may be determined based on the resources for CSI requests or CSI measurement signals used. Furthermore, the operation of nodes requesting CSI and nodes reporting CSI, as described in Figures 9 and 10, may be applied.

[0090] The set of resources available for CSI requests or CSI measurement signals may be defined so as not to overlap with the set of resources available for CSI reporting. The set of resources available for CSI reporting may be TDM or FDM with the set of resources for CSI requests or CSI measurement signals.

[0091] A node requesting a CSI may specify a CSI measurement signal to a node reporting a CSI. Regarding the periodicity of the CSI measurement signal, the CSI measurement signal may be transmitted aperiodically in response to a given CSI report.

[0092] Furthermore, a CSI measurement signal may be transmitted semi-persistently, triggered by a signal that activates the CSI measurement signal. A certain CSI request may be an activation signal, or the periodic transmission of the CSI measurement signal may continue for a predetermined number of times or for a predetermined time, or the periodic transmission of the CSI measurement signal may continue until a deactivation signal is transmitted. In addition, the CSI measurement signal may be transmitted periodically independently of the signal requesting the CSI.

[0093] A node requesting CSI may, based on a predetermined timing, designate at least one of a predetermined resource, such as time, frequency, code, and space, as a resource for the CSI measurement signal. For example, the predetermined timing may be the synchronization timing and / or the timing of sending the CSI request in control rules A1 and B1, or it may be the timing of sending the CSI request in control rules A2 and B2.

[0094] Information indicating the resources for the CSI measurement signal may be shared with other nodes, and other nodes may use resources other than those indicated. It may also be shared only among terminals 20 associated with the beam of the same base station 10, or information related to the beam may be shared among those terminals 20 together. Information indicating the resources for the CSI measurement signal may be shared with multiple nodes by a single signal.

[0095] Based on the beam timing of the node reporting the CSI, the node requesting the CSI may specify the resources for the CSI measurement signal.

[0096] The CSI measurement signal resource may be notified to multiple nodes collectively, or the CSI measurement may be performed based on a signal in a common resource among the notified nodes. Furthermore, the CSI measurement signal may always be included in the data signal, control signal, reference signal, or preamble signal corresponding to the CSI request.

[0097] As a method for notifying the resource of a CSI measurement signal, the resource may be specified using a data signal, control signal, reference signal, or preamble signal. The resource of the CSI measurement signal may be notified using a data signal, control signal, reference signal, or preamble signal corresponding to the CSI request. The resource of the CSI measurement signal may be notified using a data signal, control signal, reference signal, or preamble signal that does not contain a CSI request.

[0098] A node reporting a CSI may autonomously determine the CSI measurement signal. The data signal, control signal, reference signal, or preamble signal received from the node requesting the CSI may be used as the CSI measurement signal. The CSI measurement signal autonomously determined may be limited to the data signal, control signal, reference signal, or preamble signal received from the node requesting the CSI after a predetermined timing Tcsi. Tcsi may be defined in the specification, given by a higher-layer parameter, determined by MAC-CE, specified by a control signal (e.g., DCI), or specified by a preamble signal.

[0099] Tcsi may have different values ​​depending on the circumstances. For example, Tcsi may have different values ​​for each data receiving node, different values ​​depending on the frequency (e.g., band, carrier, cell), different values ​​depending on the service type or request (e.g., eMBB, URLLC), or different values ​​depending on the priority (e.g., priority index, priority value, priority at the PHY layer, priority at the MAC layer). Also, Tcsi may be applied based on the timing of the CSI request or the timing of the CSI trigger.

[0100] The CSI measurement signal may be predefined or set. The CSI measurement signal may be set from the base station 10 to the terminal 20, or a common setting may be predetermined in the system. Resources for CSI requests or CSI measurement signals may be associated with resources for CSI reporting, or resources for CSI reporting may be determined based on the resources for CSI requests or CSI measurement signals used.

[0101] Furthermore, a resource for transmitting CSI measurement signals may be pre-configured for each communication node, and CSI measurement signals may be transmitted periodically independently of CSI requests.

[0102] A node requesting a CSI may specify the content of the CSI report to the node reporting the CSI. It may also specify which of the above-mentioned channel status, location information, or measurement target information is to be requested as the CSI report content. The specification of the CSI report content may be made using a data signal, control signal, reference signal, or preamble signal. Furthermore, the specification of the CSI report content may be made using a data signal, control signal, reference signal, or preamble signal that corresponds to or requests the CSI report.

[0103] A node reporting a CSI may autonomously determine the content of the CSI report. The content of the CSI report may also be determined based on the communication status with the node requesting the CSI. For example, if the most recent data reception failed, CQI may be determined as the CSI report content. For example, if the most recent data reception was performed via multi-layer communication, RI or PMI may be determined as the CSI report content. In addition, information indicating the content of the CSI report may be notified along with the CSI report.

[0104] The CSI report content may be predefined or set. The CSI report content may be set from the base station 10 to the terminal 20, or a common setting may be predefined for the system. The association between resources for CSI requests, resources for CSI measurement signals, or resources for CSI reporting and the CSI report content may be set, and the CSI report content may be determined based on the resources used.

[0105] If a node reporting a CSI has data it wishes to send, the data and the CSI report may be sent together. Alternatively, if a node reporting a CSI has data it wishes to send, the data and the CSI report may be sent separately, or one may be sent first.

[0106] Figure 11 shows an example (1) of CSI report transmission and reception in an embodiment of the present invention. The transmission procedure for a CSI report may be the same as that for data transmission. That is, the transmission procedure for data transmission is the procedure for transmitting a data signal, a control signal, a reference signal, and a preamble signal (when control rules A2 and B2 above are applied), and as shown in Figure 11, the CSI report may be transmitted instead of the data signal, and a CSI report signal, a control signal, a reference signal, and a preamble signal may be transmitted. Also, when control rules B1 and B2 above are applied, LBT may be performed before signal transmission.

[0107] Figure 12 shows an example (2) of CSI report transmission and reception in an embodiment of the present invention. The CSI report transmission procedure may be different from the data transmission procedure. That is, a signal for CSI reporting may be defined. As shown in Figure 12, a CSI report signal and a preamble signal (when control rules A2 and B2 above apply) may be transmitted at a designated resource without a control signal for reception. Also, when control rules B1 and B2 above apply, LBT may not be performed before signal transmission. For example, a resource notified as a CSI reporting resource may not be used by other nodes. Also, for example, if there are transmissions from nodes requesting CSI or reporting CSI consecutively or within a predetermined time gap before the CSI reporting resource, LBT may not be performed.

[0108] A node requesting a CSI may assume that the CSI report will be sent from the node reporting the CSI using the specified CSI reporting resource. Alternatively, the node requesting the CSI may assume that the CSI report will be sent by a predetermined time. This predetermined time may be based on the Tmax described above.

[0109] A node requesting a CSI may assume that, if certain conditions are met, a CSI report will be sent from the node reporting the CSI using the specified CSI reporting resource. Alternatively, a node requesting a CSI may assume that, if certain conditions are met, the CSI report will be sent by a predetermined time.

[0110] A node sends a signal request, and a node that receives the signal request sends a corresponding signal to the node that sent the signal request. The signal sent in response to a signal request is referred to as an SRS, but is not limited to this. The method for requesting an SRS transmission (hereinafter also referred to as an "SRS request") may be any of the following 1)-3).

[0111] 1) An SRS request may be transmitted in a signal related to a data transmission. The SRS request may be included in the data signal, control signal, reference signal, or preamble signal. For example, the control signal may contain information corresponding to the SRS request. For example, the SRS request may be transmitted by a sequence of reference signals or a sequence of preamble signals.

[0112] 2) Transmission of an SRS request without data transmission may be defined. A control signal, reference signal, or preamble signal containing an SRS request may be transmitted. A CSI request may be transmitted using the same transmission procedure as a data transmission to which control rules A1, A2, B1, or B2 above apply. In the case of control rule B1 or B2 above, LBT may be performed before the transmission of a signal containing an SRS request.

[0113] 3) SRS transmission may be triggered when certain conditions are met. For example, if data is transmitted from one node X to another node Y, and an SRS request is received by node Y during the data transmission, node Y may trigger an SRS transmission to node X and send an SRS to node X. For example, if data is transmitted from one node X to another node Y, node Y may trigger an SRS transmission to node X and send an SRS to node X. In other words, the above SRS transmission may be triggered without an explicit SRS request.

[0114] For example, if data is transmitted from one node X to another node Y, and any of the following conditions a) b) c) are met, node Y may trigger an SRS transmission to node X and send an SRS to node X. a) If data reception or decoding fails a predetermined number of times or within a predetermined time b) If the amount of resources used for data transmission, the MCS (Modulation and coding scheme), or the TBS (Transport block size) exceeds or falls below a predetermined value. c) When data transmission within a predetermined time resource is notified in advance.

[0115] A node requesting SRS transmission may specify resources for SRS transmission to a node transmitting SRS. The specified resources may be indicated in a predetermined time unit (e.g., a slot), or in a predetermined time, frequency, or code unit (e.g., a symbol, PRB, cyclic shift, or OCC index).

[0116] A node requesting SRS transmission may specify SRS transmission resources to the node sending the SRS. Regarding the periodicity of SRS, SRS may be transmitted aperiodically in response to a given SRS request.

[0117] Alternatively, SRS transmission may be semi-persistent, triggered by a signal that activates SRS transmission. An SRS request may be an activation signal, or periodic SRS transmission may continue for a predetermined number of times or for a predetermined time, or periodic SRS transmission may continue until a deactivation signal is transmitted.

[0118] A node requesting SRS transmission may, based on a predetermined timing, designate at least one of a predetermined resource, such as time, frequency, code, and space, as a resource for SRS. For example, the predetermined timing may be the synchronization timing and / or the timing of sending the SRS request in control rules A1 and B1, or it may be the timing of sending the SRS request in control rules A2 and B2.

[0119] Information indicating SRS transmission resources may be shared with other nodes, and other nodes may use resources other than those indicated. It may also be shared only among terminals 20 associated with the same base station 10's beam, or beam-related information may be shared among those terminals 20. Information indicating SRS transmission resources may be shared with multiple nodes via a single signal.

[0120] Based on the beam timing of the node transmitting the SRS, the node requesting the SRS may specify a predetermined resource. Furthermore, information indicating the SRS request and the resource for transmitting the SRS may be notified to multiple nodes collectively, and resources orthogonal to each other may be specified among the notified nodes.

[0121] Resources for SRS transmission may have associated usages, and their parameters, resources, and operation may differ based on these usages. For example, usages may be defined for each CSI type, and may include CSI measurement, beam control for nodes requesting SRS, beam control for nodes transmitting SRS, etc.

[0122] The resource for SRS transmission may be specified using a data signal, control signal, reference signal, or preamble signal (if control rules A2 and B2 above apply). The resource for SRS transmission may be specified using a data signal, control signal, reference signal, or preamble signal (if control rules A2 and B2 above apply) corresponding to the SRS request.

[0123] A node sending an SRS may use the resources specified by the node requesting the SRS to send the SRS to the node requesting the SRS. A node sending an SRS may always use the resources specified by the node requesting the SRS to send the SRS to the node requesting the SRS.

[0124] Furthermore, if the resource specified by the node requesting the SRS is unavailable, the node sending the SRS may use other resources to send the SRS to the node requesting the SRS. For example, if there is another scheduled transmission or reception using the same time resource as the resource specified by the node requesting the SRS, the node sending the SRS may determine that the specified resource is unavailable. For example, in control rule A2 or B2, if preamble signal detection and decoding of related signals detect that at least a portion of the resource specified by the node requesting the SRS is being used by another node, the node sending the SRS may determine that the specified resource is unavailable. For example, in control rule A2 or B2, if preamble signal detection and decoding of related signals determine that a reception operation is to be performed on at least a portion of the resource specified by the node requesting the SRS, and simultaneous reception and transmission are not possible, the node sending the SRS may determine that the specified resource is unavailable. For example, if LBT detects a signal from another node and transmission on the resource specified by the node requesting the SRS is not possible, the node sending the SRS may determine that the specified resource is unavailable. Furthermore, a node that transmits SRS may operate to transmit SRS until a predetermined time, and may cancel the SRS transmission if it fails to transmit SRS until the predetermined time.

[0125] Furthermore, if a node sending an SRS message is unavailable, it does not need to use any of the notified resources and therefore does not have to send the SRS message.

[0126] A node transmitting an SRS may autonomously determine the resource to use for SRS transmission. For example, the resource for SRS transmission could be any resource. In other words, there may be no constraints on the timing of SRS transmission.

[0127] When a node transmitting SRS autonomously determines the resources for SRS transmission, the SRS transmission may be performed by a predetermined timing Tmax. Tmax may be defined by the specification, determined by higher-layer parameters, determined by MAC-CE, or determined by control signals (e.g., DCI, UCI, or preamble signals).

[0128] Tmax may have different values ​​depending on the circumstances. For example, Tmax may have different values ​​for each node transmitting SRS, or different values ​​depending on the frequency (e.g., band, carrier, cell), or different values ​​depending on the service type or request (e.g., eMBB, URLLC), or different values ​​depending on the priority (e.g., priority index, priority value, priority at the PHY layer, priority at the MAC layer). Also, Tmax may be applied based on the timing of the SRS request or the timing of the SRS trigger.

[0129] Furthermore, Tmax may be determined based on parameters related to LBT. That is, Tmax may be determined based on how much time is available to start transmission after receiving an SRS request. The parameters related to LBT may be the time width of the LBT or the capability related to the LBT.

[0130] A set of resources for SRS transmission may be defined in advance, and a node transmitting SRS may determine which resources to use for SRS transmission from among these resources. These resources may be configured with TDM or FDM in conjunction with data transmission resources.

[0131] Resources for SRS transmission may have a usage associated with them, and their parameters, resources, and operation may differ based on the associated usage. For example, usage may be defined for each CSI type, and may include CSI measurement, beam control for nodes requesting SRS, beam control for nodes transmitting SRS, etc. Furthermore, a set of resources for SRS transmission resources may be predetermined, and a node transmitting SRS may determine its SRS transmission resources from among this set of resources, and this set of resources may be TDM or FDM with the data transmission resource set.

[0132] A node requesting an SRS may notify a predetermined list of resource candidates for SRS transmission, and a node transmitting an SRS may autonomously select a resource for SRS transmission from among these resource candidates.

[0133] The resource candidate may also be a time window for SRS transmission, and the node transmitting SRS may autonomously select a resource for SRS transmission within that time window, similar to the operation of referring to Tmax described above.

[0134] The resource candidates may be multiple time and frequency resources for SRS transmission, and the node transmitting SRS may autonomously select the resource for SRS transmission from among these multiple time and frequency resources, similar to the operation of referencing Tmax described above.

[0135] A node sending an SRS may perform the SRS transmission to a resource selected from the candidate resources, in the same manner as the operation that references Tmax described above.

[0136] A set of resources for SRS transmission may be predefined or configured. This set of resources may be configured from the base station 10 to the terminal 20, or a common configuration may be predetermined in the system. Resources for SRS requests and resources for SRS transmission may be associated, or the SRS transmission resource may be determined based on the SRS request resource used. Furthermore, the operations of the node requesting SRS and the node transmitting SRS described above may be applied.

[0137] The set of resources available for SRS requests may be defined so as not to overlap with the set of resources available for SRS transmissions. The set of resources available for SRS transmissions may be TDM or FDM with respect to the set of resources for SRS requests.

[0138] The SRS transmission procedure may be the same as the data transmission procedure. That is, the data transmission procedure is to transmit the data signal, control signal, reference signal, and preamble signal (if control rules A2 and B2 above apply), and the SRS may be transmitted in place of or in addition to the data signal, and the SRS, control signal, reference signal, and preamble signal may be transmitted. Also, if control rules B1 and B2 above apply, LBT may be performed before signal transmission.

[0139] The SRS transmission procedure may differ from that of data transmission. That is, a signal for SRS transmission may be defined. SRS and preamble signals (if control rules A2 and B2 above apply) may be transmitted at a designated resource without a control signal for reception. Also, if control rules B1 and B2 above apply, LBT may not be performed before signal transmission. For example, a resource designated as an SRS transmission resource may not be used by other nodes. Also, for example, if there are transmissions from nodes requesting SRS or transmitting SRS consecutively or within a predetermined time gap before an SRS transmission resource, LBT may not be performed.

[0140] A node requesting an SRS may assume that the SRS will be sent from the node sending the SRS using the specified SRS transmission resource. Alternatively, a node requesting an SRS may assume that the SRS will be sent by a predetermined time. This predetermined time may be based on the Tmax timing described above.

[0141] A node requesting an SRS may assume, if certain conditions are met, that the SRS will be sent from the node sending the SRS using the specified SRS transmission resource. Alternatively, a node requesting an SRS may assume, if certain conditions are met, that the SRS will be sent by a predetermined time.

[0142] A node requesting an SRS may perform a CSI measurement based on the most recent X SRSs received from a node transmitting the same SRS. Alternatively, a node requesting an SRS may perform a CSI measurement based on the most recent T SRSs received from a node transmitting the same SRS. SRS CSI measurements may be performed based on SRS received over time.

[0143] A node requesting an SRS may perform a predetermined CSI measurement based on the received SRS. A node requesting an SRS may autonomously determine the content of the CSI measurement. The content of the CSI measurement may be the CSI notified to the node sending the SRS along with the SRS request. The content of the CSI measurement may be predefined or set.

[0144] The CSI measurement details may be set from the base station 10 to the terminal 20, or common settings may be predetermined in the system. The CSI measurement details may be associated with SRS request resources or SRS transmission resources, or the CSI measurement details may be determined based on the resources used. In addition, the CSI measurement details may be notified from the node transmitting the SRS to the node requesting the SRS.

[0145] The above embodiment clarifies the operations related to CSI measurement and reporting, SRS requests, and transmission in a system in which the base station 10 or terminal 20 autonomously selects resources for DL, UL, or SL transmission.

[0146] In other words, in a wireless communication system that autonomously determines the resources to be used, it is possible to measure the channel status, report the measurement results, and improve transmission quality.

[0147] (Device configuration) Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above. The base station 10 and terminal 20 include functions to perform the embodiments described above. However, the base station 10 and terminal 20 may each be equipped with only one of the proposed functions from the embodiments.

[0148] <Base station 10> Figure 13 shows an example of the functional configuration of a base station 10. As shown in Figure 13, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Figure 13 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called the communication unit.

[0149] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining information from the received signals, for example, information of a higher layer. The transmitting unit 110 also has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitting unit 110 also transmits setting information, etc., as described in the embodiment.

[0150] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20 in a storage device and reads it from the storage device as needed. The control unit 140 performs control of the entire base station 10, including, for example, control related to signal transmission and reception and control related to LBT. The signal transmission function unit of the control unit 140 may be included in the transmission unit 110, and the signal reception function unit of the control unit 140 may be included in the reception unit 120. The transmission unit 110 and the reception unit 120 may also be called the transmitter and receiver, respectively.

[0151] <Terminal 20> Figure 14 shows an example of the functional configuration of terminal 20. As shown in Figure 14, terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Figure 14 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called the communication unit.

[0152] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains signals from higher layers from the received physical layer signals. The transmitting unit 210 also transmits a HARQ-ACK, and the receiving unit 220 receives the configuration information and the like as described in the embodiment.

[0153] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device and reads it from the storage device as needed. The setting unit 230 also stores pre-set setting information. The control unit 240 controls the entire terminal 20, including control related to signal transmission and reception and control related to LBT. The signal transmission function in the control unit 240 may be included in the transmission unit 210, and the signal reception function in the control unit 240 may be included in the reception unit 220. The transmission unit 210 and the reception unit 220 may also be called the transmitter and receiver, respectively.

[0154] (Hardware configuration) The block diagrams (Figures 13 and 14) used in the description of the above embodiments show 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 one or more devices with software.

[0155] 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. As mentioned above, the method of implementation is not particularly limited.

[0156] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 15 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0157] In the following explanation, the term "device" can be read as "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0158] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0159] 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 devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0160] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes a computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 13 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 14 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above-described processes have been explained as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0161] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0162] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc 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. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0163] 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 referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0164] 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).

[0165] Furthermore, each device, such as the processor 1001 and the storage device 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.

[0166] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0167] (Summary of the embodiments) As described above, according to an embodiment of the present invention, a communication device is provided that includes a transmitting unit that transmits a signal to another communication device requesting the transmission of an SRS (Sounding reference signal) in an autonomously selected resource, a receiving unit that receives the SRS from the other communication device, and a control unit that performs a measurement using the SRS.

[0168] With the above configuration, in a system where the base station 10 or terminal 20 autonomously selects resources for DL, UL, or SL transmission, the operations related to SRS requests and transmissions can be clarified. In other words, in a wireless communication system that autonomously determines the resources to be used, the channel status can be measured, the measurement results reported, and the transmission quality can be improved.

[0169] The transmitting unit may transmit information indicating the resources to be used for SRS transmission to multiple communication devices, including the other communication devices associated with the same beam. This configuration clarifies the operations related to SRS requests and transmissions in a system in which the base station 10 or terminal 20 autonomously selects resources for DL, UL, or SL transmission.

[0170] The transmitting unit may determine the resources to be used for SRS transmission based on the beam timing of the other communication device. With this configuration, in a system in which the base station 10 or terminal 20 autonomously selects resources for DL, UL, or SL transmission, the resources to be used for SRS transmission can be determined according to the beam of the communication device transmitting SRS.

[0171] The receiving unit may assume that it receives the SRS from the other communication device by a certain point in time after the transmitting unit sends a signal requesting the transmission of the SRS. This configuration makes it possible to clarify the operation related to SRS reception in a system in which the base station 10 or terminal 20 autonomously selects resources for DL, UL, or SL transmission.

[0172] The control unit may perform the measurement based on the most recently received SRS from the other communication device. This configuration clarifies the operation related to SRS measurement in a system in which the base station 10 or terminal 20 autonomously selects resources for DL, UL, or SL transmission.

[0173] Furthermore, according to an embodiment of the present invention, a communication method is provided in which a communication device performs a transmission procedure for transmitting a signal to another communication device requesting the transmission of an SRS (Sounding reference signal) in an autonomously selected resource, a reception procedure for receiving the SRS from the other communication device, and a control procedure for performing a measurement using the SRS.

[0174] With the above configuration, in a system where the base station 10 or terminal 20 autonomously selects resources for DL, UL, or SL transmission, the operations related to SRS requests and transmissions can be clarified. In other words, in a wireless communication system that autonomously determines the resources to be used, the channel status can be measured, the measurement results reported, and the transmission quality can be improved.

[0175] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0176] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0177] Each aspect / embodiment described in this disclosure may be applied to at least one of the following systems: LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), 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).

[0178] 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.

[0179] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0180] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0181] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0182] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0183] 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.

[0184] 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.

[0185] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. 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.

[0186] 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.

[0187] The terms “system” and “network” as used in this disclosure are interchangeable.

[0188] 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.

[0189] 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. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0190] In this disclosure, terms such as "base station (BS)", "wireless base station", "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.

[0191] A base station can accommodate one or more (e.g., three) cells. If a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0192] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0193] 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.

[0194] 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 IoT (Internet of Things) device such as a sensor.

[0195] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 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.

[0196] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0197] 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."

[0198] 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.

[0199] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0200] 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."

[0201] Any reference to elements using the designations “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, or that the first element must precede the second element in any way.

[0202] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0203] 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.

[0204] 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. 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.

[0205] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic 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.

[0206] A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a time unit based on neurology.

[0207] 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.

[0208] 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.

[0209] 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 mini-slot 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, mini-slot, etc., instead of a subframe.

[0210] 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 terminal 20 to allocate wireless resources (such as the frequency bandwidth and transmission power available to each terminal 20) in TTI units. However, the definition of TTI is not limited to this.

[0211] 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.

[0212] 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.

[0213] 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.

[0214] 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.

[0215] 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.

[0216] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0217] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0218] 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.

[0219] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology system in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. A Bandwidth Part (PRB) may be defined and numbered within a given BWP.

[0220] A BWP may include a BWP for UL (Ultraviolet Link) and a BWP for DL ​​(Download Link). One or more BWPs may be set for a terminal 20 within a single carrier.

[0221] At least one of the configured BWPs may be active, and terminal 20 does not need to be expected to send or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0222] 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.

[0223] 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.

[0224] 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."

[0225] 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).

[0226] In this disclosure, the base station 10 and terminal 20, or the transmitting node and receiving node, are examples of communication equipment.

[0227] 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 can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way. [Explanation of Symbols]

[0228] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 devices 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 30 Core Network 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A transmitting unit that sends a signal to the terminal requesting the transmission of an SRS (Sounding reference signal) on an autonomously selected resource, A receiving unit that receives the aforementioned SRS from the terminal, It has a control unit that performs measurements using the SRS, The transmitting unit is a base station that transmits information indicating the resources used for transmitting the SRS to multiple terminals, including the terminal associated with the same beam of the device.

2. The base station according to claim 1, wherein the transmitting unit determines the resources to be used for transmitting the SRS based on the timing of the beam of the terminal.

3. The base station according to claim 1, wherein the receiving unit is assumed to receive the SRS from the terminal by a certain time after the transmitting unit transmits a signal requesting the transmission of the SRS.

4. The base station according to claim 1, wherein the control unit performs a measurement based on the most recently received SRS among the SRS received from the terminal.

5. A transmission procedure that sends a signal to a terminal requesting the transmission of an SRS (Sounding reference signal) at an autonomously selected resource, A receiving procedure for receiving the aforementioned SRS from the terminal, A control procedure for performing a measurement using the aforementioned SRS, A communication method in which a base station performs the procedure of transmitting information indicating the resources used for transmitting the SRS to multiple terminals, including the terminal associated with the same beam of its own device.

Images