JP2022186369A - Base station device, control method, and program for executing coexistence with legacy system - Google Patents

Abstract

To suppress occurrence or influence of interference.SOLUTION: A base station device that performs communication including transmitting a reference signal over the entire system frequency band according to a first communication standard obtains information on resources related to a frequency and time allocated for other base station device to transmit user data to the terminal device, from the other base station device that operates according to a second communication standard different from the first communication standard, or a second other base station device that is associated with the other base station device and operates according to the first communication standard, and performs control to limit use for transmitting user data of resources indicated by the information, or transmission of the reference signal to be transmitted in the resources.SELECTED DRAWING: Figure 5

Description

The present invention relates to techniques for reducing interference between wireless communication systems.

Wireless communication systems are being deployed according to the 3rd Generation Partnership Project (3GPP) 5th Generation (5G) wireless communication standards. This 5G wireless communication system is under development and is being used together with fourth generation (4G) wireless communication standards, such as the Long Term Evolution (LTE) standard. In such an environment, it is assumed that the frequency resources used in the 4G wireless communication system will be used in order to increase the frequency resources that can be used in the 5G wireless communication system (see Patent Document 1).

JP 2020-096297 A

Based on orthogonal frequency division multiple access, the LTE standard defines a minimum radio resource unit as a resource element consisting of a frequency carrier and one OFDM symbol. Communication is performed between the base station apparatus and the terminal apparatus using a plurality of resource elements as one resource block and using the resource block as the minimum unit for allocating communication. In the LTE standard, resource elements in which reference signals are allocated are distributed throughout the system frequency band, and the base station apparatus is supposed to transmit reference signals even in resource blocks that do not transmit user data. Therefore, when resource blocks that are not allocated for user data communication in the LTE standard are allocated for 5G communication, the LTE standard reference signal interferes with 5G communication.

In addition, when one base station device can execute LTE communication and 5G communication, the base station device transmits 5G signals in time/frequency resources where LTE reference signals are not transmitted. Interference can be prevented. However, even in this case, for example, interference from reference signals transmitted from other adjacent base station apparatuses will occur.

The present invention provides techniques for reducing the effects of interference between systems that share frequency resources.

A base station apparatus according to one aspect of the present invention is a base station apparatus that performs communication including transmitting a reference signal over the entire system frequency band according to a first communication standard, which is different from the first communication standard. From another base station device that operates according to the second communication standard, or from a second other base station device that is associated with the other base station device and operates according to the first communication standard, the other acquisition means for acquiring information on resources related to frequency and time allocated for transmission of user data to a terminal device by a base station apparatus of; and control means for performing control to limit transmission of the reference signal to be transmitted.

A base station apparatus according to another aspect of the present invention measures the radio quality of signals from other base station apparatuses that transmit reference signals over the entire system frequency band in accordance with a first communication standard. an instruction means for instructing a terminal device operating according to a second communication standard different from the communication standard of the second communication standard; an acquisition means for acquiring the result of the measurement of the radio quality from the terminal device; and based on the result of the measurement, the terminal When the apparatus receives a signal from the other base station apparatus with power equal to or higher than a predetermined level, information on resources related to frequency and time to be allocated for transmitting user data to the terminal apparatus is transmitted to the other base station apparatus. and a transmitting means for allocating the resource and transmitting user data to the terminal device according to the second communication standard.

ADVANTAGE OF THE INVENTION According to this invention, the influence of the interference between the systems which share a frequency resource can be reduced.

It is a figure which shows the structural example of a radio|wireless communications system. It is a figure which shows the hardware structural example of a base station apparatus. FIG. 4 is a diagram illustrating an example of functional configuration of a first base station apparatus; FIG. 4 is a diagram showing an example of functional configuration of a second base station apparatus; FIG. 3 is a diagram illustrating an example of the flow of processing performed in a wireless communication system;

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. It should be noted that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more of the features described in the embodiments may be combined arbitrarily. Also, the same or similar configurations are denoted by the same reference numerals, and redundant explanations are omitted.

(Configuration of communication system)
FIG. 1 shows a configuration example of a wireless communication system according to this embodiment. This radio communication system is a radio communication system in which radio resources such as frequency, time, and space are shared according to a plurality of radio communication standards. In one example, the wireless communication system is a cellular communication system according to the 3rd Generation Partnership Project (3GPP) standards. Below, as a plurality of wireless communication standards, the Long Term Evolution (LTE) standard is used as the first communication standard, and the fifth generation (5G) standard (New Radio (NR) standard) is used as the second communication standard. shall be provided. This wireless communication system includes, for example, a first base station device 101 capable of communicating in both LTE and 5G, and a second base station device 102 capable of communicating in LTE. .

The first base station apparatus 101 has, for example, a communication circuit for LTE and a communication circuit for 5G, which can be coordinated to transmit an LTE signal and a 5G signal from a common antenna. Further, the first base station apparatus 101 receives a signal in which an LTE signal and a 5G signal are mixed by a common antenna, and can separate the LTE signal and the 5G signal from the received signal. can be configured as This allows the first base station apparatus 101 to communicate in parallel with a terminal device conforming to the LTE standard and a terminal device conforming to the 5G standard. Note that this is only an example, and the first base station device 101 is configured as a set of base station devices including one or more LTE base station devices and one or more 5G base station devices. may In this case, the LTE base station apparatus and the 5G base station apparatus are, for example, physically connected to each other and logically associated with each other so that they can communicate cooperatively. In one example, the base station device for LTE is another (which may or may not be associated with the base station device for 5G) LTE base station device for 5G control, for example, the X2 interface or S1 interface. Note that this is just an example, and communication between base station devices is possible by directly connecting between base station devices or connecting between base station devices via other nodes, such as the Xn interface or an interface that will be defined in the future. Any interface that allows can be used. Note that the first base station apparatus 101 may be a 5G base station apparatus and may not have LTE functions.

The second base station apparatus 102 communicates with a terminal apparatus conforming to the LTE standard using a communication circuit for LTE. The second base station apparatus 102 can communicate with the first base station apparatus 101 via the X2 interface or the S1 interface, for example. For example, the second base station apparatus 102 can execute communication with a functional part capable of LTE communication of the first base station apparatus 101, and the functional part capable of LTE communication is It may be configured to communicate with functions capable of communication for 5G via. Also, the second base station device 102 may be configured to be able to directly communicate with the 5G function part of the first base station device 101 . Note that the second base station apparatus 102 may also be configured to enable communication in 5G as well as in LTE. That is, the second base station apparatus 102 can be configured to be able to execute the functions of the first base station apparatus 101 described below. Note that the first base station apparatus 101 can also be configured to be able to perform the functions of the second base station apparatus 102 .

The terminal device 103 can be, for example, a user equipment (UE) capable of communicating with the first base station device 101 according to the 5G standard. Note that, in one example, the terminal device 103 is configured to be capable of communicating in accordance with the LTE standard, and can be configured to perform communication in LTE when communication in 5G is not possible. The terminal device 103 may, for example, connect to a 5G network under control of the 5G communication function of the first base station device 101 and communicate according to the 5G standard. In addition, the terminal device 103 is also configured to be able to measure LTE standard signals, for example, upon receiving an instruction from the 5G communication function of the first base station device 101 .

In this embodiment, it is assumed that the terminal device 103 communicates with the first base station device 101 by 5G in the cell 111, for example. The first base station apparatus 101, for example, defines a part of the shared frequency band of LTE and 5G for 5G communication, allocates corresponding time and frequency resources to the terminal apparatus 103, and transmits a 5G signal. can send. Here, when the terminal device 103 stays at the edge of the cell 111, it is assumed that the signal received by the terminal device 103 receives interference from the signals transmitted in the adjacent cells 112 and 113. FIG. Here, for example, the first base station apparatus 101 does not use the frequency and time resources allocated for transmitting user data of the terminal apparatus 103 in the cell 111 in the cell 112, so that the user data transmission of the cell 112 signal can be suppressed. Similarly, the first base station apparatus 101 notifies the second base station apparatus 102 of resource allocation information for the terminal apparatus 103 so that the second base station apparatus 102 does not use the resource. You can also However, in the LTE standard, reference signals (cell-specific reference signals) are to be transmitted over the entire system frequency band, and resources not used for transmitting user data are no exception. Therefore, the terminal device 103 is subject to interference by the reference signals transmitted from the cells 112 and 113 . Therefore, the present embodiment provides a technique for suppressing the effects of such interference.

In this embodiment, the first base station apparatus 101 connected to the terminal apparatus 103 transmits information of frequency and time resources (positions of resource blocks) allocated to the terminal apparatus 103 to the second base station apparatus 102. to notify you. This information is transmitted, for example, via the X2 interface or the S1 interface. In one example, the 5G functional part of the first base station apparatus 101 can notify the second base station apparatus 102 of information via the LTE functional part of the first base station apparatus 101 . The information notified here may have any format as long as it is information that can identify the resource blocks allocated to the terminal device 103 . Also, inside the first base station apparatus 101, the 5G function part can notify the LTE function part related to the cell 112 of the resource information. Note that this notification may be performed in the same manner as notification between base station apparatuses, or may be performed via a unique interface inside the apparatus.

Then, the second base station device 102 (and the LTE functional part related to the cell 112 of the first base station device 101) is responsible for transmission of user data of the resource indicated by the information received from the first base station device 101. It not only restricts the use for , but also restricts the transmission of reference signals. Here, the restriction on transmission of reference signals can be either stopping transmission of reference signals in resources indicated by the acquired information or reducing the transmission power of cell-specific reference signals in those resources. . Restricting the use of a resource for transmission of user data also includes not allocating user data to that resource. This restriction can also include, for example, not allocating that resource in a beam formed towards the terminal 103 to transmit user data. If the direction in which the beam is formed is variable, the user data may be communicated by forming the beam avoiding the direction of the terminal device 103 . In this case, the cell-specific reference signal is not transmitted or the power is sufficiently low in the resource indicated by the acquired information, but the demodulation reference signal is transmitted. can be demodulated. Note that the LTE functional part related to the cell 112 of the first base station apparatus 101 can also limit the use of resources allocated to the terminal apparatus 103 for transmitting user data and transmitting reference signals. On the other hand, the LTE functional part related to the cell 111 of the first base station apparatus 101 does not use, for example, the resource element in which the cell-specific reference signal is transmitted for communication of the user data of the terminal apparatus 103, and the LTE user Data transmission may not be allocated. According to this, it is possible to prevent the LTE reference signal from interfering with the communication of the terminal device 103 while the reference signal is transmitted in the cell 111 . Also, in the cell 111, the resource allocated to the terminal device 103 may not transmit the cell-specific reference signal, or the transmission power thereof may be reduced. According to such a process, it is possible to sufficiently suppress interference from LTE in resources allocated to communication of user data by 5G of the terminal device 103 .

In addition, in LTE, the terminal device measures the power of the cell-specific reference signal, calculates the average value of the power in the entire system frequency band, and outputs it as RSRP (reference signal received power). there is Therefore, limiting the transmission of some reference signals can affect this RSRP measurement. Therefore, the second base station apparatus 102 and the LTE function part of the cell 112 of the first base station apparatus 101 cannot be used to determine the number of reference signals whose transmission is stopped and the total amount of reduction in the transmission power of the reference signals. can increase the transmit power level of the reference signal on other frequency resources corresponding to the same time by a power corresponding to . As a result, the power of the reference signal is maintained in the entire system frequency band, so that the influence on the RSRP measurement can be suppressed.

Note that all LTE base station apparatuses that may interfere with the terminal apparatus 103 can be caused to perform the above-described processing. can be avoided. Therefore, in some embodiments, the base station apparatus that performs the above process can be limited. For example, the first base station device 101 (5G functional part of the first base station device 101) is a signal (eg, cell-specific reference signal) transmitted from the surrounding LTE base station device to the terminal device 103 can specify the LTE base station apparatus to perform the above-described processing based on the measurement results.

For example, the first base station apparatus 101 identifies an LTE cell in which the measurement result of the received power of the signal from the terminal apparatus 103 exceeds a predetermined value, and sends the terminal apparatus 103 is notified of information on resources to be allocated. As a result, the base station apparatus that can give sufficiently strong interference to the terminal device 103 limits the transmission of user data and the transmission of reference signals in the resource allocated to the terminal device 103, and the communication of the terminal device 103 is restricted. can be efficiently suppressed.

Also, for example, when the measurement result exceeds a predetermined value, the first base station apparatus 101 may instruct the terminal apparatus 103 to report the result. At this time, the first base station apparatus 101 may instruct the measurement result to be reported when the number of times the measurement result exceeds a predetermined value reaches a predetermined number of times. may be instructed to report the measurement result when the result of continues to exceed a predetermined value. This indication may be, for example, a measurement indication for inter-radio access technology (RAT) handover specified in the 5G standard. As an event related to the measurement instruction for inter-RAT handover, a report is sent to the base station device when the measurement result of radio quality in neighboring cells with different RATs (that is, with different radio communication standards) exceeds a predetermined threshold. There is an Event B1 to define. By using this Event B1, the terminal device 103 can be made to report the surrounding LTE cells (that is, base station devices) in which the received signal power exceeds the threshold. Therefore, the base station apparatus 101 can notify the base station apparatus corresponding to the cell for which the measurement result has been reported, of the resource information to be allocated to the terminal apparatus 103 . As a result, the base station apparatus that can give sufficiently strong interference to the terminal device 103 limits the transmission of user data and the transmission of reference signals in the resource allocated to the terminal device 103, and the communication of the terminal device 103 is restricted. can be efficiently suppressed.

Note that the first base station device 101 has a common area with a cell that provides 5G communication services to the terminal device 103. Regarding the LTE cell formed by the first base station device 101, , can be instructed to the terminal device 103 to be excluded from measurement targets. Since the first base station apparatus 101 recognizes the resource allocated to the terminal apparatus 103 and can recognize in advance the level of interference of the LTE signal in the cell 111, the terminal apparatus 103 This is because there is no need to let the For example, a measurement instruction to the terminal device 103 may cause pre-configured cell measurements, eg, cells included in a neighbor cell list, to be performed. In this case, the cell 111 can be included in the cells, and the first base station apparatus 101 can include information indicating that the cell 111 is excluded from the measurement target in the measurement instruction. Also, a cell to be measured may be designated each time in the measurement instruction to the terminal device 103 . In this case, first base station apparatus 101 may exclude cell 111 from the measurement target cells. This can prevent the terminal device 103 from performing unnecessary measurements.

Note that the first base station apparatus 101 determines how much the transmission power of the reference signal is reduced in each base station apparatus based on the measured value of the received power of the signal from the second base station apparatus 102 or the like in the terminal apparatus 103. It may be determined whether or not to reduce power consumption, and the determined amount of power reduction may be notified to the second base station apparatus 102 or the like. According to this, the second base station apparatus 102 and the like can transmit reference signals with appropriately reduced power while sufficiently suppressing interference with the terminal apparatus 103 .

An example of the configuration of the first base station apparatus 101 and the second base station apparatus 102 that execute the processes described above and an example of the flow of the processes to be executed will be described below.

(Device configuration)
A hardware configuration example of the first base station apparatus 101 and the second base station apparatus 102 will be described with reference to FIG. The 1st base station apparatus 101 and the 2nd base station apparatus 102 are comprised including the processor 201, ROM202, RAM203, the memory|storage device 204, and the communication circuit 205 in an example. The processor 201 is a computer including one or more processing circuits such as a general-purpose CPU (Central Processing Unit) and ASIC (Application Specific Integrated Circuit). By reading and executing the program stored in the device, the overall processing of the device and each of the above-described processings are executed. The ROM 202 is a read-only memory that stores information such as programs and various parameters related to processing executed by the first base station device 101 and the second base station device 102 . A RAM 203 is a random access memory that functions as a work space when the processor 201 executes programs and stores temporary information. The storage device 204 is configured by, for example, a detachable external storage device or the like. The communication circuit 205 is configured by, for example, a circuit for wireless communication such as LTE or 5G. Although one communication circuit 205 is illustrated in FIG. 2, the first base station apparatus 101 and the second base station apparatus 102 can have multiple communication circuits. For example, the first base station apparatus 101 can have an antenna common to wireless communication circuits for LTE and 5G. Note that the first base station apparatus 101 may have separate antennas for LTE and 5G. Moreover, the first base station device 101 can further have a wired communication circuit used when communicating with other base station devices such as the second base station device 102 and nodes of the core network. Also, the second base station apparatus 102 can have a wireless communication circuit and antenna for LTE, and a wired communication circuit for wired communication. Note that the first base station apparatus 101 and the second base station apparatus 102 may have separate communication circuits 205 for each of a plurality of usable frequency bands, or at least part of these frequency bands may have a common communication circuit 205 for

FIG. 3 is a diagram showing a functional configuration example of the first base station apparatus 101. As shown in FIG. The first base station apparatus 101 has, for example, a measurement instruction section 301, a measurement result acquisition section 302, a resource setting notification section 303, and a communication section 304 as its functions. Note that FIG. 3 shows only functions particularly related to the present embodiment, and omits illustration of various other functions that the first base station apparatus 101 may have. For example, the first base station device 101 naturally has other functions that LTE and 5G base station devices generally have. Moreover, the functional blocks in FIG. 3 are shown schematically, and each functional block may be integrated and realized, or may be further subdivided. Each function in FIG. 3 may be implemented by, for example, the processor 201 executing a program stored in the ROM 202 or the storage device 204. For example, the processor inside the communication circuit 205 may execute a predetermined It may be implemented by executing software. Note that the details of the processing executed by each functional unit will not be described here, and only the general functions thereof will be described. Note that the “first base station device 101” here is a base station device that provides 5G communication to the terminal device 103 (for example, a functional part that provides the cell 111 of the first base station device 101). be. Therefore, the function part that provides, for example, the cell 112 inside the first base station apparatus 101 can be handled in the same way as the second base station apparatus 102 described later.

The measurement instruction unit 301 instructs the terminal device 103 scheduled to communicate in 5G to the surrounding LTE base station devices (the second base station device 102 and the functional part related to the cell 112 of the first base station device 101 ) to perform measurements on signals (eg, cell-specific reference signals). This indication may be sent using a 5G control message, for example. This indication is sent to the terminal device 103, for example, by means of a message causing measurement reporting of signals of wireless communication standards other than 5G for inter-RAT handover. Note that this instruction may be performed using an LTE standard control message, and for example, a message for measurement reporting for intra-RAT handover can be used. This message may cause a report to be sent when the measured LTE signal power value exceeds a predetermined value. At this time, information indicating the predetermined value, a report immediately when a signal with a power value exceeding the predetermined value is measured, or a power value of the signal measurement result exceeding the predetermined value for a predetermined number of times or a signal A report condition indicating whether to transmit a report when there is a cell whose measurement result exceeds a predetermined value for a certain period of time may be notified. Also, for the 5G communication of the terminal device 103, the LTE cell deployed by the base station device that performs resource sharing control for the LTE communication and the 5G communication is excluded from the measurement target. , measurement targets can be specified. In addition, the measurement instruction|indication part 301 can transmit a measurement instruction|indication with respect to the terminal device 103, for example using an RRC message (RRCReconfiguration message etc.).

The measurement result acquisition unit 302 receives a report of signal measurement results from the terminal device 103 . This reporting may, for example, be done according to the 5G standard, but may also be done according to the LTE standard. The resource setting notification unit 303 sets radio resources (frequency and time resources) for communication of 5G user data to the terminal device 103 . In addition, the resource setting notification unit 303 identifies the LTE base station apparatus that is the transmission source of the LTE signal received by the terminal apparatus 103 with sufficiently strong power, based on the information obtained by the measurement result obtaining unit 302. Then, information indicating the set radio resource is notified to the LTE base station apparatus. This notification can be done via the X2 interface or the S1 interface, for example using 4G functionality. Note that the resource setting notification unit 303 calculates, for example, based on the measurement result obtained by the measurement result obtaining unit 302, how much the amount of interference should be reduced to sufficiently reduce the influence on the communication of the terminal device 103. etc., and the reduction level of the amount of interference may be notified together. The communication unit 304 performs 5G communication with the terminal device 103 using the resource set by the resource setting notification unit 303 . In one example, information on resources to be allocated to the terminal device 103 may be notified to all LTE base station devices 102 located at positions that may interfere with the terminal device 103 . In this case, first base station apparatus 101 does not need to have measurement instruction section 301 and measurement result acquisition section 302 as its functions.

FIG. 4 is a diagram showing a functional configuration example of the second base station apparatus 102. As shown in FIG. The second base station apparatus 102 has, for example, a resource information acquisition section 401 and a communication control section 402 as its functions. Note that FIG. 4 shows only functions particularly related to the present embodiment, and omits illustration of various other functions that the second base station apparatus 102 may have. For example, the second base station device 102 naturally has other functions that LTE base station devices generally have. Moreover, the functional blocks in FIG. 4 are shown schematically, and each functional block may be integrated and realized, or may be further subdivided. 4 may be implemented by the processor 201 executing a program stored in the ROM 202 or the storage device 204, for example. It may be implemented by executing software. Note that the details of the processing executed by each functional unit will not be described here, and only the general functions thereof will be described. Note that the “second base station device 102” here is a base station device that provides 5G communication to the terminal device 103 (for example, a functional part that provides the cell 111 of the first base station device 101). , any base station device capable of LTE communication.

The resource information acquisition unit 401 acquires information on resources allocated to the terminal device 103 from the first base station device 101 . The communication control unit 402 limits the use of resources indicated by the acquired information for transmitting user data, and limits the transmission of reference signals (for example, cell-specific reference signals) in these resources. For example, the communication control unit 402 prohibits the resource indicated by the acquired information from being used for transmission of user data, and performs control to stop transmission of the reference signal. For example, the communication control unit 402 can prevent user data from being transmitted in a beam directed toward the terminal device 103 . Further, for example, when the first base station apparatus 101 instructs the communication control unit 402 to lower the power level of the reference signal, the communication control unit 402 reduces the transmission power of the reference signal by the power level specified by the instruction. sell. Note that when the communication control unit 402 stops the reference signal or reduces the power in the resource notified by the resource information acquisition unit 401, the reference signal is limited according to the amount of decrease in the power level of the reference signal. In time, the power of the reference signal on other frequency resources can be increased.

(Processing flow)
Next, an example of the flow of processing executed in the wireless communication system according to this embodiment will be outlined using FIG. Since the details of each process are as described above, only the outline of the process will be described here, and the detailed description thereof will be omitted.

First, the first base station apparatus 101 that communicates with the terminal device 103 by 5G transmits an LTE signal measurement instruction to the terminal device 103 (S501). For example, the first base station apparatus 101 can cause the terminal apparatus 103 to configure a measurement report for inter-RAT handover using a 5G RRC message. This allows the terminal device 103 communicating in 5G to measure the radio quality of LTE. In S501, for example, identification information of a cell to be measured (physical cell identifier (PCI)) and identification information of a cell not to be measured (for example, PCI of the first base station apparatus 101) can be notified. Also, in S501, information indicating conditions for causing the terminal device 103 to report, such as a threshold of radio quality (received power) that triggers reporting, can be notified. Based on this setting, the terminal device 103 measures the received power of signals transmitted from surrounding LTE base station devices. In the example of FIG. 5, the terminal device 103 measures cell-specific reference signals from surrounding LTE base station devices such as the second base station device 102 (S502). Terminal 103 can, for example, specify the reference signal received power (RSRP) in this measurement. Signals other than cell-specific reference signals may be used as measurement targets.

After that, the terminal device 103, for example, when the conditions for reporting the measurement result are satisfied (for example, when the power value of the measurement result exceeds a predetermined value for a predetermined number of times or for a predetermined period of time), the measurement result is reported to the first base station apparatus 101 (S503). In the example of FIG. 5, for example, it is assumed that the first base station apparatus 101 is informed that the received power of the signal from the second base station apparatus 102 exceeds a predetermined value. In this case, first base station apparatus 101 transmits information of time and frequency resources to second base station apparatus 102 for transmission of user data of terminal apparatus 103 to second base station apparatus 102. Notify (S504). Then, the second base station apparatus 102 limits signal transmission on the resource indicated by the information (S505). That is, the second base station apparatus 102 does not use the resource for transmitting user data, or does not transmit user data using the resource in the beam directed toward the terminal apparatus 103 . Also, the second base station apparatus 102 stops transmitting the cell-specific reference signal in that resource or reduces the transmission power of the cell-specific reference signal. When transmission power is reduced, the amount of reduction can be reported from the first base station apparatus 101 together with resource information, for example, in S504. In addition, the second base station apparatus 101 uses a resource whose frequency is different from the resource notified by the information so that the total amount of transmission power of the cell-specific reference signal in the system frequency band is kept constant. The transmission power of the signal is increased (S506).

As described above, when 5G user data is transmitted to the terminal device 103, interference with the user data due to cell-specific reference signals from surrounding LTE cells can be suppressed.

The invention is not limited to the above embodiments, and various modifications and changes are possible within the scope of the invention.

Claims (14)

A base station apparatus that performs communication including transmitting a reference signal over the entire system frequency band according to a first communication standard,
From another base station device operating according to a second communication standard different from the first communication standard, or from a second other base station device associated with the other base station device and operating according to the first communication standard acquisition means for acquiring resource information related to frequency and time allocated by the other base station apparatus for transmitting user data to the terminal apparatus from the base station apparatus of
a control means for performing control to limit the use of resources indicated by the information for transmission of user data and the transmission of the reference signal to be transmitted in the resources;
A base station device characterized by having: The control means increases the transmission power of the reference signal in the resource indicated by the information and the resource indicated by the information at the same time and different frequency based on the power of the reference signal limited in the resource indicated by the information. The base station apparatus according to claim 1, characterized by: 3. The base station apparatus according to claim 1, wherein said acquisition means acquires said information via an interface connecting between base station apparatuses. 4. The base station apparatus according to claim 3, wherein an interface connecting said base station apparatuses includes an X2 interface or an S1 interface. The control means is formed by not transmitting user data in the resource indicated by the information, or directed toward the terminal device to which the other base station device transmits user data using the resource. 5. The method according to any one of claims 1 to 4, characterized in that the use of said resource for transmitting user data is restricted by not allocating said resource for transmitting user data in a beam. Base station equipment. The control means limits transmission of the reference signal on the resource by stopping transmission of the reference signal on the resource indicated by the information or by reducing transmission power of the reference signal on the resource. The base station apparatus according to any one of claims 1 to 5, characterized by: A base station device,
Operates according to a second communication standard different from the first communication standard so as to measure the radio quality of signals from other base station apparatuses that transmit reference signals over the entire system frequency band according to the first communication standard. an instruction means for instructing a terminal device;
Acquisition means for acquiring the measurement result of the radio quality from the terminal device;
Based on the result of the measurement, when the terminal device receives a signal from the other base station device with power equal to or higher than a predetermined level, a frequency assigned to transmit user data to the terminal device; and a notification means for notifying the other base station apparatus of time-related resource information;
transmitting means for allocating the resource and transmitting user data to the terminal device according to the second communication standard;
A base station device characterized by having: The instruction means excludes the cell conforming to the first communication standard formed by the base station apparatus from a measurement target, or is formed by a second other base station apparatus associated with the base station apparatus. 8. The base station apparatus according to claim 7, wherein an instruction is transmitted to said terminal apparatus so as to measure said radio quality while excluding said cell of said first communication standard from a measurement target. The instruction means transmits to the terminal apparatus an instruction to report the measurement result to the base station apparatus when the radio quality exceeds a predetermined value;
The notification means notifies the information to the other base station apparatus based on the reception of the result of the measurement.
9. The base station apparatus according to claim 7 or 8, characterized by: 10. The first communication standard is the Long Term Evolution (LTE) standard and the second communication standard is the 5th Generation (5G) standard. The base station device according to . A control method executed by a base station apparatus that performs communication including transmitting a reference signal over the entire system frequency band according to a first communication standard,
From another base station device operating according to a second communication standard different from the first communication standard, or from a second other base station device associated with the other base station device and operating according to the first communication standard obtaining resource information related to frequency and time allocated by the other base station apparatus to transmit user data to the terminal apparatus from the base station apparatus of
performing control to limit the use of resources indicated by the information for transmission of user data and the transmission of the reference signal to be transmitted on the resources;
A control method comprising: A control method executed by a base station device, comprising:
Operates according to a second communication standard different from the first communication standard so as to measure the radio quality of signals from other base station apparatuses that transmit reference signals over the entire system frequency band according to the first communication standard. instructing a terminal device;
obtaining a result of the measurement of the radio quality from the terminal device;
Based on the result of the measurement, when the terminal device receives a signal from the other base station device with power equal to or higher than a predetermined level, a frequency assigned to transmit user data to the terminal device; and Notifying the other base station device of resource information related to time;
Allocating the resource and transmitting user data to the terminal device according to the second communication standard;
A control method comprising: A computer provided in a base station device that performs communication including transmitting a reference signal over the entire system frequency band according to the first communication standard,
From another base station device operating according to a second communication standard different from the first communication standard, or from a second other base station device associated with the other base station device and operating according to the first communication standard obtaining from the base station device information on resources related to the frequency and time that the other base station device allocates for transmitting user data to the terminal device;
causing control to limit the use of resources indicated by the information for transmission of user data and the transmission of the reference signal to be transmitted on the resources;
program for. In the computer provided in the base station equipment,
Operates according to a second communication standard different from the first communication standard so as to measure the radio quality of signals from other base station apparatuses that transmit reference signals over the entire system frequency band according to the first communication standard. instruct the terminal device to
causing the terminal device to obtain the measurement result of the radio quality;
Based on the result of the measurement, when the terminal device receives a signal from the other base station device with power equal to or higher than a predetermined level, a frequency assigned to transmit user data to the terminal device; and causing the other base station apparatus to notify resource information related to time;
causing the terminal device to transmit user data by allocating the resource according to the second communication standard;
program for.

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