User device, 5g mobile communication system, and user device control method

Abstract

This user device is for a 5G mobile communication system comprising memory and a processor. The user device performs a beam sweep using a resource block allocated by a base station, acquires information based on the noise intensity of an interference wave measured by an adjacent user device as a result of performing the beam sweep, and determines a beam to be used on the basis of information regarding an interfering beam.

Description

User device, 5G mobile communication system, and user device control method

[0001] The present invention relates to a user device, a 5G mobile communication system, and a method for controlling the user device. This application claims priority to Japanese Patent Application No. 2024-050336 filed on March 26, 2024, the contents of which are incorporated herein by reference.

[0002] In a 5G mobile communication system, it has been known that a problem is to appropriately control the influence of interference between base stations and interference between user devices (hereinafter, sometimes referred to as cross-link interference (CLI)). Conventionally, a technique such as that described in Patent Document 1 has been known as a technique for measuring cross-link interference.

[0003] JP 2023-052199 A

[0004] Among crosslink interference, interference between user equipment (UEs) in particular varies significantly as the user equipment moves, resulting in significant variations in the characteristics of the interference. Therefore, there has been a problem in that it is not possible to effectively control the effects of interference. For example, to consider interference between UEs when selecting beams for UEs, it is necessary to know beams that may interfere with neighboring UEs. However, currently, there is no means for a UE to identify and feed back interfering beams and remove them from the list of beam selection candidates when performing beam sweeps.

[0005] The present invention has been made in consideration of these circumstances, and its purpose is to provide a user device, a 5G mobile communication system, and a method for controlling a user device that can suitably control the effects of crosslink interference.

[0006] (1) One aspect of the present invention is a user device for a 5G mobile communication system, comprising a memory and a processor, that performs a beam sweep using resource blocks allocated by a base station, acquires information based on the noise intensity of interference waves measured by adjacent user devices as a result of the beam sweep, and determines a beam to be used based on the information about the interfering beam. (2) Another aspect of the present invention is the user device described in (1) above that acquires an index of a beam determined to be interfering based on the noise intensity of interference waves measured by adjacent user devices as a result of the beam sweep, and determines a beam to be used by excluding the index of the beam determined to be interfering. (3) Another aspect of the present invention is the user device described in (1) or (2) above that acquires information based on the ratio of interference waves to desired waves of interference waves measured by adjacent user devices as a result of the beam sweep, and determines a beam to be used based on the ratio of interference waves to desired waves. (4) In another aspect of the present invention, the user equipment according to any one of (1) to (3) described above acquires, as a result of the beam sweep, an index of a beam determined to interfere based on the noise intensity of an interference wave measured by a neighboring user equipment and information on the ratio of the interference wave to the desired wave, and acquires information on the number of user equipments adjacent to the user equipment from a base station. If the number of user equipments adjacent to the user equipment is small, the user equipment determines a beam to use based on the index of the beam determined to interfere, and if the number of user equipments adjacent to the user equipment is large, the user equipment determines a beam to use based on the ratio of the interference wave. (5) In another aspect of the present invention, the user equipment according to any one of (1) to (4) described above acquires, from the neighboring user equipment via a base station, information based on the noise intensity of an interference wave measured by a neighboring user equipment as a result of the beam sweep. (6) In another aspect of the present invention, the user equipment according to any one of (1) to (5) described above acquires, from the neighboring user equipment, information based on the noise intensity of an interference wave measured by a neighboring user equipment as a result of the beam sweep, without going via a base station.(7) Another aspect of the present invention is a 5G mobile communication system including a user device having a memory and a processor, and a base station, wherein the base station schedules a beam sweep for the user device, the user device performs a beam sweep using resource blocks allocated by the base station, acquires information based on noise strength of interference waves measured by neighboring user devices as a result of the beam sweep, and determines a beam to be used based on information about the interfering beam. (8) Another aspect of the present invention is the 5G mobile communication system described in (7) above, wherein the base station acquires, from each of a plurality of neighboring user devices, information based on noise strength of interference waves measured by the neighboring user devices as a result of the user device performing the beam sweep, and transmits the information based on noise strength of the interference waves acquired from each of the neighboring user devices to the user device that performed the beam sweep. (9) Also, according to one aspect of the present invention, in the 5G mobile communication system of (7) or (8) described above, the base station determines neighboring user equipment based on location information of the user equipment, and schedules the neighboring user equipment to measure noise intensity of interference waves. (10) Also, according to one aspect of the present invention, there is provided a method for controlling a user equipment in a 5G mobile communication system, the method comprising: performing a beam sweep using resource blocks allocated by a base station; acquiring information based on noise intensity of interference waves measured by neighboring user equipment as a result of the beam sweep; and determining a beam to be used based on information about the interfering beam.

[0007] According to the present invention, it is possible to provide a user device, a 5G mobile communication system, and a user device that can suitably control the effects of crosslink interference.

[0008] 1 is a diagram for explaining the configuration of a 5G mobile communication system according to a first embodiment and crosslink interference. FIG. 2 is a functional configuration diagram showing the functional configuration of the 5G mobile communication system according to the first embodiment. FIG. 3 is a sequence diagram showing processing for controlling the influence of crosslink interference during uplink in the 5G mobile communication system according to the first embodiment. FIG. 4 is a sequence diagram showing processing for controlling the influence of crosslink interference during downlink in the 5G mobile communication system according to the first embodiment. FIG. 5 is a diagram for explaining an example of beamforming of a user equipment according to a second embodiment. FIG. 6 is a diagram showing the ID of a beam for which interference is measured as a result of beamforming of a user equipment according to the second embodiment. FIG. 7 is a sequence diagram for sharing measurement results of interference beams according to the second embodiment from a base station to a user equipment. FIG. 8 is a sequence diagram for sharing measurement results of interference beams according to the second embodiment between user equipments. FIG. 9 is a block diagram showing an example of the internal configuration of a base station according to the present embodiment.

[0009] Preferred embodiments of a user device, a 5G mobile communication system, and a user device according to aspects of the present invention are presented and described in detail below with reference to the accompanying drawings. Note that aspects of the present invention are not limited to these embodiments and include various modifications or improvements. In other words, the components described below include those that can be easily imagined by a person skilled in the art or that are substantially identical, and the components described below can be combined as appropriate. Furthermore, various omissions, substitutions, or modifications of components can be made without departing from the spirit of the present invention. In addition, in the drawings below, the scale and number of each structure may differ from the scale and number of the actual structure to make each configuration easier to understand.

[0010] First Embodiment First, a first embodiment will be described with reference to FIGS. 1 to 4. FIG.

[0011] 1 is a diagram illustrating the configuration of a 5G mobile communication system according to a first embodiment and crosslink interference. With reference to the diagram, the configuration of the 5G mobile communication system will be described first, and then crosslink interference occurring in the 5G mobile communication system will be described.

[0012] A CU (Central Unit) controls multiple DUs under its control. In the example shown in the figure, the CU controls DU1, DU2, ..., DUX (X is an integer equal to or greater than 1). The CU also performs processing such as PDCP (Packet Data Convergence Protocol), which connects to the core network and encrypts packets, and RRC (Radio Resource Control), which manages radio resources for terminals.

[0013] The Distributed Units (DUs) perform signal modulation and demodulation, MAC layer communication control, etc. The diagram shows the subordinate configurations of DU1 and DU2, but omits the configurations of DU3 and beyond. DU1 controls RU1 to RU1n (n is an integer equal to or greater than 1), and DU2 controls RU2 to RU2m (m is an integer equal to or greater than 1).

[0014] An RU (Radio Unit) controls antennas to communicate with UEs via radio waves. The RU also controls MIMO (Multiple-Input Multiple-Output), beamforming, and the like. Of the multiple RUs shown in the figure, the configuration of the antenna elements included in the RU will be described with reference to RU1. As shown in the figure, each filled square included in the configuration of RU1 represents an antenna. For example, RU1 has M1y antennas vertically and M1x antennas horizontally. Each antenna independently emits a directional beam.

[0015] Hereinafter, in this embodiment, a configuration including at least a DU may be referred to as a base station. A base station may also be referred to as a gNodeB (gNB), en-gNB, Next Generation-Radio Access Network (NG-RAN) node, eNB, low-power node, Central Unit (CU), Distributed Unit (DU), gNB-DU, Remote Radio Head (RRH), Integrated Access and Backhaul / Backhauling (IAB) node, etc. A base station is not limited to one node, but may be composed of multiple nodes (for example, a combination of a lower node such as an RU or DU and an upper node such as a CU).

[0016] A base station may be divided into a "slave station" with an antenna and RU, and a "master station" with a CU. The master station aggregates nearby slave stations and controls data transmission and reception. The DU may be located on the lower RU side or on the higher CU side.

[0017] A UE (User Equipment) is a terminal device used by a user. Specific examples of UEs include a smartphone, a tablet terminal device, a wearable device, and a Wi-Fi router. UE1 to UE6 are shown in the figure. For example, UE1 to UE3 are controlled by DU1, and UE4 to UE6 are controlled by DU2.

[0018] Here, an example of cross-link interference (CLI) will be described using communication between UE4 and DU2 as an example. UE4 transmits an UL (Uplink) or uplink to DU2, and DU2 transmits a DL (Downlink) or downlink to UE4. When UL is transmitted from UE4 to DU2, UE3 and UE5, which are located near UE4, may be affected by cross-link interference. The interference wave when UL is transmitted from UE4 to DU2 is illustrated as ULI. Furthermore, when DL is transmitted from DU2 to UE4, DU2, which is located near DU1, may be affected by cross-link interference. The interference wave when DL is transmitted from DU2 to UE4 is illustrated as DLI. In the following description, ULI and DLI may be referred to as crosslink interference or CLI without distinction.

[0019] 2 is a functional configuration diagram showing the functional configuration of a 5G mobile communication system according to the first embodiment. With reference to the same figure, an example of the functional configuration of a simplified 5G mobile communication system will be described. The functional configuration shown in FIG. 2 is a functional configuration that is a prerequisite for the processing of FIGS. 3 and 4 described later.

[0020] The base station has a functional configuration of a CU, DU1 to DU3, and RU1 to RU3. The CU controls DU1 to DU3. DU1 controls RU1, DU2 controls RU3, and DU3 controls RU3. DU1 communicates with UE1 and UE2, DU2 communicates with UE3, and DU3 communicates with UE4.

[0021] According to this embodiment, for each UE, the interference power experienced by neighboring UEs due to radio waves emitted by the UE is measured. The UE to be measured may be referred to as a specific UE or a first user equipment, and a UE located near the specific UE may be referred to as a neighboring UE or a second user equipment. A DU that controls a specific UE may be referred to as a specific DU. A DU located near a specific DU may be referred to as a neighboring DU. A neighboring DU can also be said to be a DU that communicates with a neighboring UE. In the illustrated example, if UE1 is a specific UE, UE2 to UE4 are neighboring UEs, DU1 is a specific DU, and DU2 and DU3 are neighboring DUs.

[0022] 3 is a sequence diagram showing a process for controlling the influence of crosslink interference during uplink in a 5G mobile communication system according to the first embodiment. The process for controlling the influence of crosslink interference during uplink according to this embodiment will be described with reference to the same figure. Note that DU1, DU2, and UE1 to UE3 shown in the same figure correspond to the configuration shown in FIG. 2. In the same figure, DU3 and UE4 shown in FIG. 2 are omitted.

[0023] (Step S101) First, a specific DU (DU1) schedules the transmission of a Sounding Reference Signal (SRS) to a specific UE (UE1). Instead of scheduling the transmission of the SRS, the DU1 may schedule the transmission of a specific radio wave different from the SRS. The specific radio wave is transmitted to the DU1, and it is preferable that the interference power of the specific radio wave be measurable by a neighboring UE.

[0024] (Step S103) Next, the DU schedules neighboring UEs UE2 and UE3 to measure the power of the radio waves transmitted from UE1. In other words, the DU schedules neighboring UEs to measure the interference power of the SRS transmitted from UE1. Here, UE2, the first neighboring UE, is connected to DU1, a specific DU. Furthermore, UE3, the second neighboring UE, is connected to DU2, which is not a specific DU (it is a neighboring DU). The scheduling of the power measurement is performed by the DU to which it is connected. In other words, the scheduling of the power measurement may be performed under the instruction of the CU. Specifically, the scheduling for UE2 is performed by DU1, and the scheduling for UE3 is performed by DU2.

[0025] Note that, as in the illustrated example, there may be multiple neighboring UEs, or, although not illustrated, there may be a single neighboring UE. Furthermore, the DU1 may determine whether a UE is a neighboring UE based on location information transmitted from the UE. A specific example of location information may be information received from an artificial satellite such as a GPS (Global Positioning System). In this case, neighboring DUs connected to the neighboring UE may share the UE's location information between the DUs. Furthermore, the determination of whether a DU is a neighboring DU may be performed by a CU that controls a specific DU, DU1.

[0026] (Step S105) Next, UE1, which is a specific UE, transmits a specific radio wave (for example, SRS) based on the scheduling from DU1.

[0027] (Step S107) Next, the neighboring UEs UE2 and UE3 measure the interference power. A specific radio wave (e.g., SRS) is originally transmitted to DU1, but by measuring the radio wave intensity, the neighboring UEs can measure the degree of interference of the radio wave.

[0028] (Step S109) The measured interference power is fed back from each neighboring UE to the DU. Here, UE2, which is the first neighboring UE, is connected to DU1, which is a specific DU. Also, UE3, which is the second neighboring UE, is connected to DU2, which is not a specific DU (a neighboring DU). The interference power is fed back to the connected DU. Specifically, UE2 feeds back the interference power to DU1, and UE3 feeds back the interference power to DU2. In other words, the DU acquires the measurement results of the power measured by the neighboring UEs.

[0029] (Step S111) Next, the neighboring DUs feed back the acquired interference power to the specific DU. Specifically, the neighboring DU 2 feeds back the acquired interference power to the specific DU 1. In other words, the neighboring DUs share the measurement results of the power measured by the neighboring UE with the node (specific DU 1) controlled by the common upper node (CU).

[0030] (Step S113) Next, the specific DU calculates the interference signal power from the interference power acquired in steps S109 and S111 based on the allocation result. The interference signal power may be the total interference signal power. Note that the interference signal power calculated by the specific DU does not need to be the total, and may be, for example, the interference signal arriving at each neighboring UE.

[0031] (Step S115) Next, DU1, which is a specific DU, shares the calculated total interference signal power or the interference signals arriving at each neighboring UE with neighboring DUs.

[0032] (Step S117) DU2, which is a neighboring DU, acquires the total interference signal power calculated by the specific DU or the interference signal arriving at each neighboring UE. DU2 can also be said to acquire information regarding the power of the interference signal arriving at the neighboring DU. DU2 performs scheduling based on the shared information.

[0033] 4 is a sequence diagram showing a process for controlling the influence of crosslink interference during downlink in a 5G mobile communication system according to the first embodiment. The process for controlling the influence of crosslink interference during downlink according to this embodiment will be described with reference to the same figure. Note that DU1 and DU2 shown in the same figure correspond to the configuration shown in FIG. 2. In the same figure, DU3 and UE1 to UE4 shown in FIG. 2 are omitted.

[0034] DU1 and DU2 are controlled by a common upper node (CU). In the downlink, the DU that transmits radio waves is referred to as a specific DU, and the DU that receives interference power due to the radio wave transmission is referred to as an adjacent DU. In the following description, DU1, which is a specific DU, may be referred to as a first node, and DU2, which is an adjacent DU, may be referred to as a second node.

[0035] (Step S201) First, a specific DU, DU1, schedules the measurement of a specific radio wave to an adjacent DU, DU2. Here, the specific radio wave may be CLI-RSSI. It is preferable that the CU indicates the scheduling priority of the DUs in advance.

[0036] (Step S203) Next, the DU1 transmits a specific radio wave. Specifically, the transmission of the specific radio wave may be the transmission of a reference signal of a received signal strength indicator (RSSI). Note that instead of transmitting the RSSI reference signal, the DU1 may transmit a specific radio wave different from the RSSI reference signal. It is preferable that the specific radio wave allows the interference power to be measured by an adjacent DU.

[0037] (Step S205) Next, DU2, which is an adjacent DU, measures the interference power when DU1 transmits a specific radio wave.

[0038] (Step S207) DU2 also feeds back the measured interference power to DU1.

[0039] (Step S209) Next, DU1 schedules resource blocks (RBs) and time slots, taking crosslink interference into consideration. DU1 also calculates interference signal power based on the interference power received from DU2. The interference signal power may be the total interference signal power. Note that the interference signal power calculated by DU1 does not need to be the total interference power, but may be, for example, the interference signal arriving at each adjacent DU. Note that, although there is one adjacent DU in the illustrated example, there may also be multiple adjacent DUs.

[0040] (Step S211) Next, DU1 shares the calculated total interference signal power or the interference signals arriving at each neighboring DU with the neighboring DUs. DU1 can also be said to provide feedback of accurate interference signal power calculated from CLI based on the allocation result.

[0041] (Step S213) DU2, which is an adjacent DU, acquires the total interference signal power calculated by the specific DU or the interference signals arriving at each adjacent DU. DU2 can also be said to acquire information regarding the power of the interference signals arriving at the adjacent DU. DU2 performs scheduling based on the shared information.

[0042] [Summary of First Embodiment] According to the above-described embodiment, a base station according to this embodiment is a base station of a 5G mobile communication system including a memory and a processor, and schedules transmission of a specific radio wave to a first user device that is a user device included in the 5G mobile communication system, schedules measurement of the power transmitted by the first user device to a second user device, acquires measurement results of the power measured by the second user device, shares the measurement results of the power measured by the second user device with nodes controlled by a common upper node, and acquires information on the power of an interfering signal arriving at the second user device from the nodes that have shared the measurement results of the power measured by the second user device. By adopting such a configuration, according to this embodiment, it is possible to suitably control the influence of crosslink interference occurring in the uplink.

[0043] Furthermore, according to the above-described embodiment, the base station according to this embodiment is a base station for a 5G mobile communication system including a memory and a processor, and includes a first node and a second node controlled by a common upper node, and schedules transmission of a specific radio wave from the first node to the second node, the first node transmits the specific radio wave, the second node measures interference power when the first node transmits the specific radio wave and transmits the measured interference power to the first node, the first node calculates the interference power based on the interference power received from the second node, and the second node performs scheduling based on the interference power calculated by the first node. By adopting such a configuration, according to this embodiment, it is possible to suitably control the influence of crosslink interference occurring in the downlink.

[0044] Second Embodiment Next, a second embodiment will be described with reference to Fig. 5 to Fig. 8. In the second embodiment, it is assumed that the user equipment performs beamforming.

[0045] 5 is a diagram illustrating an example of beamforming of user equipment according to the second embodiment. In the figure, UE1 to UE3 are shown as examples of user equipment. UE1 transmits beams #1 to #12 for uplink transmission. Each beam has a predetermined directivity.

[0046] Here, in the positional relationship between UE1 and UE2, it can be said that interference occurs because beams #9 to #11 transmitted by UE1 are received by UE2. Also, in the positional relationship between UE1 and UE3, it can be said that interference occurs because beams #4 and #5 transmitted by UE1 are received by UE3.

[0047] 6 is a diagram showing the IDs of beams for which interference is measured as a result of beamforming by a user equipment according to the second embodiment. The IDs of the above-mentioned interfering beams are collectively shown in the figure. That is, beam #4 and beam #5 transmitted by UE1 interfere with UE2, and beams #9 to #11 interfere with UE3. According to this embodiment, the ID of a beam causing such interference is identified, the ID of the identified beam is fed back, and the beam is removed from the list of candidate beams. Note that, instead of or in addition to identifying the ID of the interfering beam, the radio wave intensity of the interfering beam may be used.

[0048] 7 is a sequence diagram when the measurement results of the interference beam according to the second embodiment are shared from the base station to the user equipment. Referring to the same figure, the process for controlling the influence of crosslink interference according to this embodiment will be described. Note that all of the DUs shown in the figure are connected to UE1 to UE3. The UE performing the beam sweep may be referred to as a specific DU, and the UEs adjacent to the specific UE may be referred to as adjacent UEs. Also, the DU connected to the specific UE may be referred to as a specific DU. In the example shown in the figure, DU1 is the specific DU, UE1 is the specific UE, and UE2 and UE3 are adjacent UEs.

[0049] (Step S301) First, DU1, a specific DU, schedules beam sweep for UE1, a specific UE.

[0050] (Step S303) Next, DU1 determines neighboring UEs based on the UE's location information. A specific example of location information used to determine neighboring UEs is information received from an artificial satellite such as GPS. DU1 schedules neighboring UEs to measure the noise intensity of interference waves. If there are multiple neighboring UEs, DU1 schedules each of the multiple neighboring UEs to measure the noise intensity of interference waves. In the example shown in the figure, DU1 schedules neighboring UEs UE2 and UE3 to measure the noise intensity of interference waves. In addition to scheduling the noise intensity measurement of interference waves, DU1 also allocates an RB for interference feedback.

[0051] (Step S305) Next, DU1 allocates resource blocks for notifying UE1 of the index of the interference beam. The resource blocks allocated by DU1 may also be used to notify radio wave intensity in addition to the index of the interference beam.

[0052] (Step S307) Next, UE1 performs beam sweep using the resource blocks allocated by DU1.

[0053] (Step S309) Next, the neighboring UE measures the radio wave strength when the beam sweep is performed by DU1, i.e., the noise strength of the interference wave. The neighboring UE feeds back the noise strength of the interference wave obtained as a result of the measurement to the DU. In the example shown in the figure, the neighboring UEs UE2 and UE3 are both connected to DU1, so UE2 and UE3 feed back the noise strength of the interference wave to DU1.

[0054] (Step S311) DU1 acquires the noise intensity of interference waves from each of one or more neighboring UEs. DU1 can also be said to acquire information based on the noise intensity of interference waves measured by the neighboring UEs as a result of beam sweeping by UE1. DU1 notifies UE1, which is a specific UE, of the acquired information.

[0055] (Step S313) UE1 determines the beam to use based on the "information on interfering beams" measured by neighboring UEs.

[0056] Here, it is preferable that the "information about the interfering beam" used by UE1 to determine the beam to be used includes at least information about the index of the beam. UE1 can also obtain the index of the beam determined to be interfering based on the noise intensity of the interference wave measured by the neighboring UE as a result of performing a beam sweep. UE1 may determine the beam to be used by excluding the beam with that index. By transmitting the beam index from the neighboring UE in this way, the payload can be made smaller than when transmitting the noise intensity.

[0057] Furthermore, it is preferable that the "information on interfering beams" used by UE1 to determine the beam to be used includes information on the ratio of the interference wave measured by adjacent user equipment to the desired wave (e.g., SINR (Signal-to-Noise Ratio)). UE1 may acquire the SINR of the interference wave measured by adjacent UEs as a result of performing a beam sweep, and determine the beam to be used based on the acquired SINR. For example, based on the SINR, the beam to be used may be determined by excluding beams with a high noise ratio. By feeding back the SINR, the payload becomes larger, but the adjacent UE can make a more detailed determination based on the noise ratio. For example, in a situation where UEs are densely packed, even if all beam indexes interfere, it is possible to select a beam with a low noise ratio and continue communication.

[0058] The above-described embodiment of transmitting a beam index and the embodiment of implementing SINR may be used in combination. For example, the beam to be used may be determined using the beam index under normal circumstances, and the beam to be used may be determined using the SINR under congested circumstances. In this case, UE1 acquires the index of the beam determined to be interfering and information on the ratio of the interference wave to the desired wave based on the noise intensity of the interference wave measured by the neighboring UE as a result of performing a beam sweep. Furthermore, UE1 acquires information on the number of UEs adjacent to itself from DU1. When the number of neighboring UEs is small, UE1 determines the beam to be used based on the index of the beam determined to be interfering, and when the number of neighboring UEs is large, UE1 determines the beam to be used based on the SINR. This configuration enables light-load processing under normal circumstances, while highly accurate processing under congested circumstances.

[0059] 8 is a sequence diagram when the measurement results of the interference beam according to the second embodiment are shared between user equipments. A modified example of the process for controlling the influence of crosslink interference according to this embodiment will be described with reference to the same figure. Note that all of the DUs shown in the figure are connected to UE1 to UE3. A UE that performs beam sweeping may be referred to as a specific DU, and UEs adjacent to the specific UE may be referred to as adjacent UEs. Also, a DU connected to a specific UE may be referred to as a specific DU. In the example shown in the figure, DU1 is a specific DU, UE1 is a specific UE, and UE2 and UE3 are adjacent UEs.

[0060] The sequence described with reference to FIG. 7 is an example of a case where the measurement results of the interference beam are shared from the base station to the user equipment. In this case, UE1 acquires information based on the noise intensity of the interference wave measured by neighboring UEs as a result of performing a beam sweep via the base station. However, according to this embodiment, information may be shared between UEs without going through the base station. For example, it is possible to share the measurement results of the interference beam via SideLink. In the modified example shown in FIG. 8, a sequence for sharing the measurement results of the interference beam via SideLink is described.

[0061] (Step S401) First, DU1, which is a specific DU, schedules beam sweep for UE1, which is a specific UE.

[0062] (Step S403) Next, DU1 determines neighboring UEs based on the location information of the UEs. A specific example of location information used to determine neighboring UEs is information received from an artificial satellite such as GPS. DU1 schedules the measurement of noise intensity of interference waves for neighboring UEs. If there are multiple neighboring UEs, DU1 schedules the measurement of noise intensity of interference waves for each of the multiple neighboring UEs. In the example shown in the figure, DU1 schedules the measurement of noise intensity of interference waves for neighboring UEs UE2 and UE3. In addition to scheduling the measurement of noise intensity of interference waves, DU1 also schedules interference feedback.

[0063] (Step S405) Next, UE1 performs beam sweep.

[0064] (Step S407) Next, the neighboring UE measures the radio wave strength when DU1 performs the beam sweep, i.e., the noise strength of the interference wave. The neighboring UE feeds back the noise strength of the interference wave obtained as a result of the measurement to UE1, which is a specific UE. UE1 can also obtain information based on the noise strength of the interference wave measured by the neighboring UE as a result of performing the beam sweep from the neighboring UE without going through the base station. Note that in the example shown in the figure, it is assumed that the UEs can be connected to each other via a side link or the like. If the UEs are not connected to each other, the method shown in FIG. 7 may be used.

[0065] (Step S409) UE1 determines a beam to use based on information based on the noise strength of interference waves measured by neighboring UEs.

[0066] [Summary of the Second Embodiment] According to the above-described embodiment, the user equipment is a user equipment of a 5G mobile communication system equipped with a memory and a processor, and performs beam sweeping using resource blocks allocated by a base station, acquires information based on the noise intensity of interference waves measured by adjacent user equipment as a result of the beam sweeping, and determines a beam to be used based on the information about the interfering beam. By adopting such a configuration, according to the present embodiment, it is possible to suitably control the influence of crosslink interference between user equipment, even when the user equipment performs beamforming.

[0067] FIG. 9 is a block diagram showing an example of the internal configuration of a base station or user equipment according to this embodiment. At least some of the functions of the base station or user equipment can be implemented using a computer. As shown in the figure, the computer includes a central processing unit 901, a RAM 902, an input / output port 903, input / output devices 904 and 905, and a bus 906. The computer itself can be implemented using existing technology. The central processing unit 901 executes instructions contained in a program read from the RAM 902 or the like. In accordance with each instruction, the central processing unit 901 writes data to the RAM 902, reads data from the RAM 902, and performs arithmetic and logical operations. The RAM 902 stores data and programs. Each element included in the RAM 902 has an address and can be accessed using the address. Note that RAM is an abbreviation for "random access memory." The input / output port 903 is a port through which the central processing unit 901 exchanges data with external input / output devices. The input / output devices 904 and 905 are input / output devices. Input / output devices 904 and 905 exchange data with central processing unit 901 via input / output port 903. Bus 906 is a common communication path used within the computer. For example, central processing unit 901 reads and writes data from RAM 902 via bus 906. Also, for example, central processing unit 901 accesses an input / output port via bus 906. Furthermore, all or part of each functional unit provided in the base station may be realized using hardware such as an ASIC, PLD, or FPGA. Furthermore, all or part of each functional unit may be realized by a combination of software and hardware.

[0068] Furthermore, the above-described embodiment can, for example, "optimally control the effects of cross-link interference," thereby contributing to Goal 9 of the United Nations-led Sustainable Development Goals (SDGs), which is to "build resilient infrastructure, promote sustainable industrialization, and foster innovation."

[0069] Although an embodiment of the present invention has been described in detail above with reference to the drawings, the specific configuration is not limited to this embodiment, and design changes and the like are also included within the scope that does not deviate from the gist of the present invention.

[0070] Furthermore, a computer program for implementing the functions of each of the above-described devices may be recorded on a computer-readable recording medium, and the program may be read and executed by a computer system. The term "computer system" may also include hardware such as an OS and peripheral devices. The term "computer-readable recording medium" refers to a flexible disk, a magneto-optical disk, a ROM, a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disc), or a storage device such as a hard disk built into a computer system.

[0071] Furthermore, the term "computer-readable recording medium" also includes a storage medium that stores a program for a certain period of time, such as a volatile memory (e.g., DRAM (Dynamic Random Access Memory)) within a computer system that serves as a server or client when the program is transmitted via a network such as the Internet or a communication line such as a telephone line. The program may also be transmitted from a computer system that stores the program in a storage device or the like to another computer system via a transmission medium or by transmission waves within the transmission medium. Here, the "transmission medium" that transmits the program refers to a medium that has the function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line. The program may also be a program that realizes part of the aforementioned functions. Furthermore, the program may be a so-called differential file (differential program) that can realize the aforementioned functions in combination with a program already recorded in the computer system.

[0072] According to the present invention, the influence of cross-link interference can be suitably controlled.

[0073] UE…User Equipment、CU…Central Unit、DU…Distributed Unit、RU…Radio Unit、UL…Up Link、DL…Down Link

Claims

1. A user device for a 5G mobile communication system equipped with a memory and a processor, which performs a beam sweep using resource blocks allocated by a base station, obtains information based on the noise strength of interference waves measured by adjacent user devices as a result of the beam sweep, and determines a beam to be used based on the information about the interfering beam.

2. The user equipment of claim 1, wherein, as a result of the beam sweep, the index of a beam determined to be interfering is obtained based on the noise strength of the interference wave measured by an adjacent user equipment, and the beam to be used is determined by excluding the index of the beam determined to be interfering.

3. A user device as described in claim 1 or claim 2, which, as a result of performing the beam sweep, obtains information regarding the ratio of interference waves measured by adjacent user devices to desired waves, and determines the beam to be used based on the ratio of interference waves to desired waves.

4. The user equipment of claim 1, which, as a result of performing the beam sweep, obtains the index of the beam determined to interfere and information regarding the ratio of the interference wave to the desired wave based on the noise strength of the interference wave measured by the adjacent user equipment, obtains information regarding the number of user equipment adjacent to itself from the base station, and determines the beam to be used based on the index of the beam determined to interfere if the number of user equipment adjacent to itself is small, and determines the beam to be used based on the ratio of the interference wave if the number of user equipment adjacent to itself is large.

5. The user equipment according to claim 1 or claim 2, wherein information based on the noise intensity of the interference wave measured by the adjacent user equipment as a result of the beam sweep is obtained from the adjacent user equipment via the base station.

6. The user equipment according to claim 1 or claim 2, wherein information based on the noise intensity of the interference wave measured by the adjacent user equipment as a result of the beam sweep is obtained from the adjacent user equipment without going through the base station.

7. A 5G mobile communication system comprising a user device having a memory and a processor, and a base station, wherein the base station schedules a beam sweep for the user device, the user device performs a beam sweep using resource blocks allocated by the base station, obtains information based on the noise intensity of interference waves measured by adjacent user devices as a result of the beam sweep, and determines a beam to use based on the information on the interfering beam.

8. The 5G mobile communication system according to claim 7, wherein the base station acquires, from each of a plurality of adjacent user devices, information based on the noise strength of the interference wave measured by the plurality of adjacent user devices as a result of the user device performing the beam sweep, and transmits, to the user device that performed the beam sweep, the information based on the noise strength of the interference wave acquired from each of the plurality of adjacent user devices.

9. The 5G mobile communication system according to claim 7 or claim 8, wherein the base station determines neighboring user equipment based on location information of the user equipment, and schedules measurements of noise strength of interference waves for the neighboring user equipment.

10. A method for controlling a user device in a 5G mobile communication system, comprising a memory and a processor, the method comprising: performing a beam sweep using resource blocks allocated by a base station; acquiring information based on the noise intensity of interference waves measured by adjacent user devices as a result of the beam sweep; and determining a beam to be used based on the information on the interfering beam.

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