KR20240023891A - Method for allocating radio resources to plurality of communication links performed by iab device installed in uam and iab device performing the same - Google Patents

Abstract

Radio resources for a plurality of communication links performed by an Integrated Access and Backhaul (IAB) device that relays communication with a base station and at least one terminal using a first antenna and a second antenna according to an embodiment of the present invention. The method of allocating is a first communication link that communicates with the base station through the first antenna installed outside of the UAM (Urban Air Mobility), and the air vehicle through the second antenna installed inside the UAM. determining whether there is interference between the at least one terminal located inside and a second communication link performing communication; and allocating radio resources to each of the first communication link and the second communication link based on whether there is interference.

Description

Method for allocating radio resources to a plurality of communication links performed by an IAB device installed in UAM and IAB device performing the same {METHOD FOR ALLOCATING RADIO RESOURCES TO PLURALITY OF COMMUNICATION LINKS PERFORMED BY IAB DEVICE INSTALLED IN UAM AND IAB DEVICE PERFORMING THE SAME}

The present invention relates to a method of allocating radio resources to a plurality of communication links performed by an IAB device installed in UAM and an IAB device that performs the same.

UAM is Urban Air Mobility, which combines with a Personal Air Vehicle (PAV) capable of vertical take off and landing (VTOL) and utilizes the sky as a travel corridor.

UAM is a next-generation mobility solution that maximizes travel efficiency in the city. It emerged to solve the decline in travel efficiency due to congested traffic in the city center and the rapid increase in social costs such as logistics transportation costs. Now that long-distance travel times have increased and traffic congestion has become more severe, UAM is considered a future innovative business that solves these problems.

Meanwhile, in cellular communication for basic UAM operation, the flight control device that controls the operation of the UAM and each of the passenger terminals such as smartphones and tablet PCs can exchange data with the base station for cellular communication. In this case, there is an advantage in that it is possible to set up a communication link with the base station according to the characteristics of each terminal in the aircraft, such as a flight control device or a passenger's terminal. However, considering the UAM operation environment in which frequent handovers occur, the control signal's There may be a disadvantage that there may be significant overhead due to transmission and reception.

Therefore, in order to reduce overhead due to control signals, a method of mounting a CPE (Customer Premises Equipment) device on the UAM can be considered. In this case, the CPE device is connected to a base station for cellular network communication, and the terminal in the aircraft can connect to the Internet, a flight control server, etc. by accessing the CPE device through WiFi or the like. Since only the CPE device is connected to the base station for cellular network communication, it has the advantage of greatly reducing the overhead due to control signals related to cellular network access, but the CPE device can provide voice communication services such as VoLTE and VoNR to terminals within the aircraft. The downside is that it cannot be done.

Therefore, it is possible to consider mounting an Integrated Access and Backhaul (IAB) device on UAM instead of a CPE device. In this case, there is an advantage in that there is no need for additional settings for the terminal in the aircraft to transmit and receive data, voice communication such as VoLTE and VoNR is possible, and overhead due to control signals related to cellular network access can be reduced.

However, in the case of IAB devices, the same frequency band is used for communication with a cellular base station and for communication with a terminal within the aircraft, so there may be a problem in how to operate by considering interference between them.

The problem to be solved by the present invention is to provide a method of allocating radio resources to a plurality of communication links performed by an IAB device installed in UAM.

However, the problems to be solved by the present invention are not limited to those mentioned above, and other problems to be solved that are not mentioned can be clearly understood by those skilled in the art to which the present invention pertains from the description below. will be.

Radio resources for a plurality of communication links performed by an Integrated Access and Backhaul (IAB) device that relays communication with a base station and at least one terminal using a first antenna and a second antenna according to an embodiment of the present invention. The method of allocating is a first communication link that communicates with the base station through the first antenna installed outside the UAM (Urban Air Mobility), and the UAM through the second antenna installed inside the UAM. determining whether there is interference between the at least one terminal located inside and a second communication link performing communication; and allocating radio resources to each of the first communication link and the second communication link based on whether there is interference.

The step of determining whether there is interference includes the second antenna receiving data transmitted by the at least one terminal through the second communication link when no signal is transmitted or received from the base station through the first communication link. determining a first intensity and a second intensity as received by the first antenna; and determining, based on the difference between the first strength and the second strength, whether interference occurs in the first communication link due to the second communication link.

The step of determining whether there is interference includes the first antenna receiving data transmitted by the base station through the first communication link when no signal is transmitted or received from the at least one terminal through the second communication link. determining an instance of a third power and an instance of a fourth intensity received by the second antenna; and determining whether interference occurs in the second communication link due to the first communication link based on the difference between the third strength and the fourth strength.

The step of allocating the radio resources includes, when the interference is less than a preset threshold, time resources for each of the first communication link and the second communication link to simultaneously transmit and receive data with each of the base station and the at least one terminal. It may include the step of allocating.

The step of allocating the radio resources includes, when the interference is more than a preset threshold, the time of each of the first communication link and the second communication link so that each of the base station and the at least one terminal does not transmit and receive data at the same time. It may include the step of allocating resources.

The step of allocating radio resources may include allocating frequency resources to each of the first communication link and the second communication link in a frequency division method when the interference is greater than a preset threshold.

The step of allocating the frequency resource may include, if there is overhead that must be used to transmit control information other than data for communication with the base station or the at least one terminal, the first communication link based on the overhead. and allocating frequency resources to each of the second communication links.

The IAB device according to another embodiment of the present invention is connected to a first antenna installed outside of a UAM (Urban Air Mobility) and a second antenna installed inside the UAM to perform communication with a base station and at least one terminal. transceiver; and interference between a first communication link communicating with the base station through the first antenna and a second communication link communicating with the at least one terminal located inside the UAM through the second antenna. It may include a processor that determines whether there is interference and allocates radio resources to each of the first communication link and the second communication link based on whether there is interference.

The processor, when not transmitting or receiving signals to and from the base station through the first communication link, provides a first signal when the second antenna receives data transmitted by the at least one terminal through the second communication link. determine the power and the second power when received by the first antenna, and based on the difference between the first power and the second power, whether interference is occurring in the first communication link due to the second communication link. You can decide whether or not.

The processor may perform a third operation when the first antenna receives data transmitted by the base station through the first communication link when not transmitting or receiving a signal to or from the at least one terminal through the second communication link. determine the strength and the fourth strength when received by the second antenna, and based on the difference between the third strength and the fourth strength, whether or not interference occurs in the second communication link due to the first communication link. can be decided.

When the interference is less than a preset threshold, the processor may allocate time resources for each of the first communication link and the second communication link to simultaneously transmit and receive data with each of the base station and the at least one terminal. .

The processor may allocate time resources for each of the first communication link and the second communication link so that when the interference is greater than a preset threshold, each of the base station and the at least one terminal does not transmit and receive data at the same time. there is.

A computer program stored in a computer-readable recording medium according to another embodiment of the present invention, when executed by a processor, communicates with the base station through the first antenna installed outside of UAM (Urban Air Mobility). determining whether there is interference between a first communication link and a second communication link performing communication with the at least one terminal located inside the UAM through the second antenna installed inside the UAM; and allowing the processor to perform a method of allocating radio resources to a plurality of communication links, including allocating radio resources to each of the first communication link and the second communication link based on whether there is interference. It includes commands, and the method may be performed by an Integrated Access and Backhaul (IAB) device that relays communication with a base station and at least one terminal using a first antenna and a second antenna.

A computer-readable recording medium storing a computer program according to another embodiment of the present invention includes a first communication link that communicates with the base station through the first antenna installed outside of UAM (Urban Air Mobility); , determining whether there is interference between a second communication link that performs communication with the at least one terminal located inside the UAM through the second antenna installed inside the UAM; And instructions for causing a processor to perform a method of allocating radio resources to a plurality of communication links, including allocating radio resources to each of the first communication link and the second communication link based on whether there is interference. A computer program including a is stored, and the method may be performed by an Integrated Access and Backhaul (IAB) device that relays communication with a base station and at least one terminal using a first antenna and a second antenna.

According to an embodiment of the present invention, since radio resources are allocated to each of the first and second communication links based on whether there is interference between the first and second communication links, the IAB device prevents interference between communication links. By minimizing it, communications from devices within the base station and UAM can be relayed.

In addition, according to an embodiment of the present invention, an allocation method for each of a plurality of slots to be allocated to the first communication link and the second communication link is set based on whether there is interference between the first communication link and the second communication link. Therefore, the IAB device can relay communications between devices within the base station and UAM by minimizing interference between communication links.

Figure 1 shows a UAM navigation system according to an embodiment.
FIG. 2 is a block diagram of the UAM navigation system of FIG. 1.
Figure 3 is a block diagram conceptually illustrating the function of a radio resource allocation program according to an embodiment.
Figure 4 shows an example in which interference occurs in the first communication link due to the second communication link.
Figure 5 shows an example in which interference occurs in the second communication link due to the first communication link.
Figure 6 shows an example in which time resources are allocated to a first communication link and a second communication link.
Figure 7 is a flowchart showing a method by which a radio resource allocation program allocates radio resources to a plurality of communication links according to an embodiment.

The advantages and features of the present invention and methods for achieving them will become clear by referring to the embodiments described in detail below along with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below and may be implemented in various different forms. The present embodiments are merely provided to ensure that the disclosure of the present invention is complete and to provide common knowledge in the technical field to which the present invention pertains. It is provided to fully inform those who have the scope of the invention, and the present invention is only defined by the scope of the claims.

In describing embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. The terms described below are terms defined in consideration of functions in embodiments of the present invention, and may vary depending on the intention or custom of the user or operator. Therefore, the definition should be made based on the contents throughout this specification.

FIG. 1 shows a UAM navigation system according to an embodiment, and FIG. 2 is a block diagram of the UAM navigation system of FIG. 1.

Referring to FIGS. 1 and 2 , the UAM navigation system 10 may include a base station 20, a terminal 40, and an IAB device 100.

The base station 20 may be connected to the IAB device 100 to support cellular communication of at least one terminal 40 within UAM (Urban Air Mobility).

The base station 20 may transmit and receive data with the IAB device 100 through the first antenna 140 to support cellular communication to the terminal 40.

The terminal 40 may include a navigation control device (not shown) that controls the operation of the UAM and a user terminal such as a smartphone or tablet PC controlled by a passenger such as an operator.

The terminal 40 can access the cellular network through the base station 20.

The terminal 40 may transmit and receive data with the IAB device 100 through the second antenna 150 in order to connect to the base station 20.

The Integrated Access and Backhaul (IAB) device 100 may be a relay node that supports access to the terminal 40 and wireless self-backhauling. That is, the IAB device 100 can relay communication between the base station 20 and the terminal 40 so that the terminal 40 can perform cellular communication.

To this end, the IAB device 100 may be connected to the first antenna 140 and the second antenna 150. The IAB device 100 may transmit and receive data with the base station 20 using the first antenna 140 and transmit and receive data with the terminal 40 using the second antenna 150.

The first antenna 140 may be installed outside the UAM, and the second antenna 150 may be installed inside the UAM. This is to transmit and receive data with data transmission and reception targets inside and outside the UAM without reducing signal strength (i.e., minimizing the decrease in signal strength). That is, the first antenna 140 is installed outside the UAM to transmit and receive data with the base station 20 located outside the UAM without reducing signal strength, and the second antenna 150 is located inside the UAM. It can be installed inside the UAM to transmit and receive data with the terminal 40 without reducing signal strength.

In this specification, for convenience of explanation, the IAB device 100 is expressed as connected to the first antenna 140 and the second antenna 150, but it is not limited thereto. That is, depending on the embodiment, the IAB device 100 may include a first antenna 140 and a second antenna 150.

IAB device 100 may include a processor 110, a transceiver 120, and a memory 130.

The processor 110 may generally control the operation of the IAB device 100.

The processor 110 can use the transceiver 120 to transmit and receive data with the base station 20 through the first antenna 140, and to transmit and receive data with the terminal 40 through the second antenna 150. there is.

The memory 130 may store the wireless resource allocation program 200 and information necessary for execution of the wireless resource allocation program 200.

In this specification, the radio resource allocation program 200 includes a first communication link that communicates with the base station 20 through the first antenna 140, and at least one link located inside the UAM through the second antenna 150. Contains instructions programmed to determine whether there is interference between the terminal 40 and the second communication link performing communication, and to allocate radio resources for each of the first communication link and the second communication link based on whether there is interference. It can mean software.

In order to execute the wireless resource allocation program 200, the processor 110 may load the wireless resource allocation program 200 and information required for execution of the wireless resource allocation program 200 from the memory 130.

The processor 110 executes the radio resource allocation program 200 to establish a first communication link for communicating with the base station 20 through the first antenna 140 and a terminal through the second antenna 150. 40), radio resources may be allocated to each of the second communication links that perform communication.

The function and/or operation of the wireless resource allocation program 200 will be examined in detail with reference to FIG. 3.

Figure 3 is a block diagram conceptually illustrating the function of a radio resource allocation program according to an embodiment.

1, 2, and 3, the wireless resource allocation program 200 includes an interference determination unit 210, a division method determination unit 220, a frequency division unit 230, and a time division unit 240. can do.

The interference determination unit 210, division method determination unit 220, frequency division unit 230, and time division unit 240 shown in FIG. 3 are radio resource allocation units to easily explain the function of the radio resource allocation program 200. The functions of the allocation program 200 are conceptually divided, and are not limited thereto. Depending on the embodiment, the functions of the interference determination unit 210, the division method determination unit 220, the frequency division unit 230, and the time division unit 240 may be merged/separated and included in one program. It can be implemented as a series of instructions.

The interference determination unit 210 has a first communication link for communicating with the base station 20 through the first antenna 140, and a second communication link for communicating with the terminal 40 through the second antenna 150. It is possible to determine whether there is interference between links.

More specifically, the interference determination unit 210 determines the signal strength when the first antenna 140 receives data transmitted by the terminal 40 and the data transmitted by the base station 20 to the second antenna 150. Based on the difference between the signal strength when received, it can be determined whether there is interference between the first communication link and the second communication link.

Depending on the embodiment, the interference determination unit 210, when not transmitting or receiving signals with the base station 20 through the first communication link, transmits the signal transmitted by the terminal 40 through the second communication link to the second antenna. Determine a first power when received by 150 and a second power when received by first antenna 140, and based on the difference between the first power and the second power, determine the second power of the second communication link. It is possible to determine whether interference occurs in the first communication link (that is, whether the interference occurring is insignificant, hereinafter collectively referred to as whether interference occurs).

Alternatively, depending on the embodiment, when the interference determination unit 210 does not transmit or receive a signal with the terminal 40 through the second communication link, the signal transmitted by the base station 20 through the first communication link is transmitted to the first communication link. Determine a third intensity when received by the antenna 140 and a fourth intensity when received by the second antenna 150, and determine the first communication intensity based on the difference between the third intensity and the fourth intensity. It is possible to determine whether interference occurs in the second communication link due to the link.

For example, when the difference between the first intensity and the second intensity is greater than (exceeds) a preset reference difference (e.g., a predetermined value from 10 dB to 20 dB), the interference determination unit determines the first communication due to the second communication link. It can be determined that the interference occurring in the link is minimal. In addition, depending on the embodiment, when the difference between the third intensity and the fourth intensity is greater than (exceeds) the reference difference, the interference determination unit 210 determines that interference occurring in the second communication link due to the first communication link It can be determined that the interference is minimal.

That is, when the difference between the first intensity and the second intensity is greater than (exceeds) the reference difference, and the difference between the third intensity and the fourth intensity is greater than (exceeding) the reference difference, the interference determination unit 210 ) may determine that the interference occurring between the first communication link and the second communication link is minimal.

On the other hand, for example, when the difference between the first intensity and the second intensity is less than (or less than) the reference difference, the interference determination unit 210 determines that interference has occurred in the first communication link due to the second communication link. You can decide. Additionally, when the difference between the third intensity and the fourth intensity is less than (or less than) the reference difference, the interference determination unit 210 may determine that interference has occurred in the second communication link due to the first communication link. there is.

That is, when the difference between the first intensity and the second intensity is less than (or less than) the reference difference, or when the difference between the third intensity and the fourth intensity is less than (or less than) the reference difference, the interference determination unit 210 ) may determine that interference has occurred between the first communication link and the second communication link because the interference between the first communication link and the second communication link is greater than (exceeds) a preset threshold.

Conversely, when the difference between the first intensity and the second intensity is greater than (exceeds) the reference difference, or when the difference between the third intensity and the fourth intensity is greater than (exceeding) the reference difference, the interference determination unit 210 ) may determine that the interference occurring between the first communication link and the second communication link is insignificant because the interference occurring between the first communication link and the second communication link is less than (or less than) the threshold value.

For example, Figure 4 shows an example in which interference occurs in a first communication link due to a second communication link, and Figure 5 shows an example in which interference occurs in a second communication link due to a first communication link.

Referring further to FIG. 4, when the terminal 40 located inside the UAM transmits data to the second antenna 150 located inside the UAM, the data may also be transmitted to the first antenna 140. there is. However, since the first antenna 140 is located outside the UAM, the first intensity of the data received by the second antenna 150 is reduced by the attenuation of the signal strength as the UAM passes. It may be greater than the second intensity of the data being received.

At this time, when the first intensity is greater than the second intensity by more than a preset reference difference, the impact on the first antenna 140 due to reception of the data can be considered small, and the interference determination unit 210 It may be determined that the interference caused to the first communication link by the second communication link is minimal.

In addition, with further reference to FIG. 5, when the base station 20 located outside the UAM transmits data to the first antenna 140 located outside the UAM, the data is also transmitted to the second antenna 150. It can be. However, since the second antenna 150 is located inside the UAM, the third strength of the data received by the first antenna 140 is increased by the attenuation of the signal strength as the UAM passes. It can be greater than a quarter of the data received.

At this time, when the third intensity is greater than the fourth intensity by more than the reference difference, the influence of the second antenna 150 due to reception of the data can be considered small, so the interference determination unit 210 It may be determined that the interference caused to the second communication link due to the 1 communication link is minimal.

Referring again to FIG. 3, depending on the embodiment, the interference determination unit 210 may determine whether interference has occurred between the first communication link and the second communication link periodically or aperiodically.

Alternatively, depending on the embodiment, the interference determination unit 210 may determine whether interference has occurred between the first communication link and the second communication link when a preset decision condition occurs.

The determination condition is whether the signal strength of the data received from the base station 20 or the terminal 40 is less than or equal to a preset reference strength and whether the connection time with the base station 20 or the terminal 40 is less than or equal to the preset reference time. may include.

When the interference determination unit 210 determines that interference has occurred between the first communication link and the second communication link, the division method determination unit 220 determines the frequency division duplexing (FDD) and time division method (Time Division Duplexing). The allocation method of wireless resources can be determined among Division Duplexing (TDD).

More specifically, the division method determination unit 220 may determine a method to allocate wireless resources based on the type of data to be transmitted (i.e., requirements for data transmission).

Depending on the embodiment, when the data to be transmitted requires a low delay rather than a high transmission rate (e.g., data related to navigation), the division method determination unit 220 determines the frequency as a method of allocating radio resources used for transmission of the data. You can choose the division method.

On the other hand, depending on the embodiment, when the data to be transmitted requires a high transmission rate rather than a low delay (e.g., data related to passenger infotainment), the division method determination unit 220 determines the number of radio resources used for transmission of the data. You can select the time division method as the allocation method.

When the frequency division method is selected as the allocation method of radio resources, the frequency division unit 230 divides the first communication link and the second communication link into a frequency division method based on whether there is interference between the first communication link and the second communication link. It may be determined whether to allocate radio resources to the second communication link.

More specifically, when the interference determination unit 210 determines that interference has occurred in the first communication link or the second communication link, and the division method determination unit 220 selects the frequency division method as the radio resource allocation method. , the frequency division unit 230 may allocate frequency resources to the first communication link and the second communication link in a frequency division method.

For example, if the available bandwidth for the terminal 40 to connect to the base station 20 is 100 MHz, the frequency divider 230 divides the first communication link and the second communication link 1:1, that is, 50 MHz each. Can be assigned. This is because the total communication capacity between all terminals 40 and the IAB device 100 in the UAM is not greater than the communication capacity between the IAB device 100 and the base station 20.

Depending on the embodiment, if there is overhead that must be used to transmit control information other than data, the frequency divider 230 may provide frequency resources to the first communication link and the second communication link based on the overhead. Can be assigned.

More specifically, the frequency divider 230 may allocate more frequency bandwidth to a communication link with more overhead among the first and second communication links by the difference between the second overhead and the first overhead. there is.

For example, the available bandwidth for the terminal 40 to connect to the base station 20 is 100 MHz, and the first overhead for transmitting control information between the base station 20 and the IAB device 100 is 5%, When the second overhead for transmitting control information between the IAB device 100 and the terminal 40 is 10%, the frequency divider 230 sets 47.5 MHz to the first communication link and 52.5 MHz to the second communication link. MHz can be allocated.

Meanwhile, when the interference determination unit 210 determines that the interference occurring in the first communication link and the second communication link is insignificant, the frequency division unit 230 communicates the first communication link and the second communication link in a frequency division method. Frequency resources may not be allocated to the link.

To this end, the frequency division unit 230 may not allocate frequency resources to the first communication link and the second communication link in a frequency division method as an initial setting. That is, the frequency divider 230 may, as an initial setting, allocate frequency resources so that the first communication link and the second communication link use the same frequency bandwidth.

Thereafter, based on the result of the interference determination unit 210 determining whether interference has occurred between the first communication link and the second communication link, the frequency division unit 230 determines whether interference has occurred between the first communication link and the second communication link. The frequency division method set for the communication link may be maintained or changed, and frequency resources may be allocated to the first communication link and the second communication link according to the maintained or changed frequency division method.

The time division unit 240 allocates radio resources to the first communication link and the second communication link in a time division manner, based on the presence and degree of interference between the first communication link and the second communication link. You can. At this time, the first communication link and the second communication link may use the same frequency resource.

More specifically, when the interference determination unit 210 determines that interference has occurred in the first communication link or the second communication link, and the division method determination unit 220 selects the frequency division method as the radio resource allocation method. , the time division unit 240 determines an allocation method for each of the plurality of slots to be allocated to the first communication link and the second communication link, based on whether there is interference between the first communication link and the second communication link. Time resources can be set and allocated to the first communication link and the second communication link according to the set allocation method.

The allocation method may include common slots, dedicated slots, and unusable slots. The common slot represents a slot in which the first and second communication links can simultaneously transmit and receive data through each of the first antenna 140 and the second antenna 150, and the dedicated slot represents only the second communication link. It represents a slot through which data can be transmitted and received, and the unusable slot may represent a slot through which only the first communication link can transmit and receive data.

Depending on the embodiment, when the interference occurring between the first communication link and the second communication link is insignificant, the time division unit 240 selects the slots allocated to the first communication link and the second communication link (i.e., all slots). s) can be set to the common slot.

On the other hand, depending on the embodiment, when interference occurs between the first communication link and the second communication link, the time division unit 240 selects the slots allocated to the first communication link from among a plurality of slots to the unusable slots. , and among the plurality of slots, slots allocated to the second communication link can be set as the dedicated slots.

To this end, the time division unit 240 may set the plurality of slots as the common slots as an initial setting.

Thereafter, based on the result of the interference determination unit 210 determining whether interference has occurred between the first communication link and the second communication link, the time division unit 240 determines whether the first communication link and the second communication link The allocation method of each of the plurality of slots to be allocated to the communication link may be maintained or changed, and time resources may be allocated to the first communication link and the second communication link according to the maintained or changed allocation method.

Figure 6 shows an example in which time resources are allocated to a first communication link and a second communication link.

Referring to FIGS. 3 and 6, when one subframe (i.e., two slots) is alternately allocated to the first communication link and the second communication link, the IAB device 100 operates in the first slot. (Slot #1), the second slot (Slot #2), and the N-th slot (Slot #N) are used to transmit and receive data with the base station 20 located outside the UAM, and the third slot (Slot # 3) and the fourth slot (Slot #4), data can be transmitted and received with the flight control device 40-1 and the passenger terminal 40-2 located inside the UAM.

At this time, the first slot (Slot #1), the second slot (Slot #2), and the N-th slot (Slot #N) are allocated as the unusable slots, and the third slot (Slot #3) and the fourth slot When (Slot #4) is assigned to the dedicated slot, the first slot (Slot #1), the second slot (Slot #2) and the N-th slot (Slot #N) are connected to the base station (Slot #N) through the first communication link. 20), and the third slot (Slot #3) and the fourth slot (Slot #4) can be used to transmit and receive data with the terminal 40 through the second communication link.

On the other hand, the first slot (Slot #1), the second slot (Slot #2), the third slot (Slot #3), the fourth slot (Slot #4), and the N-th slot (Slot #N) are the common When allocated to a slot, according to the transmission conditions, the first slot (Slot #1), the second slot (Slot #2), the third slot (Slot #3), the fourth slot (Slot #4) and N- The th slot (Slot #N) can be used to transmit and receive data with the base station 20 or the terminal 40.

Figure 7 is a flowchart showing a method by which a radio resource allocation program allocates radio resources to a plurality of communication links according to an embodiment.

3 and 7, the interference determination unit 210 determines the signal strength when the first antenna 140 receives data transmitted by the terminal 40 and the data transmitted by the base station 20. Based on the difference between the signal strengths when received by the second antenna 150, it may be determined whether there is interference between the first communication link and the second communication link (S700).

When interference occurs between the first communication link and the second communication link ('Yes' in S700), the division method determination unit 220 selects the type of data to be transmitted, the radio resource among the frequency division method and the time division method. The allocation method can be determined (S710).

When the frequency division method is determined as the allocation method of radio resources ('determined by FDD' in S710), the frequency division unit 230 allocates frequency resources to the first communication link and the second communication link by using the frequency division method. (S720).

Alternatively, when the time division method is determined as the allocation method of radio resources ('determined as TDD' in S710), the time division unit 240 divides the slots allocated to the first communication link among the plurality of slots into unusable slots. And, among the plurality of slots, slots allocated to the second communication link can be set as dedicated slots (S730).

On the other hand, if interference does not occur between the first communication link and the second communication link ('No' in S700), the time division unit 240 is assigned to the first communication link and the second communication link. Slots can be set as common slots (S740).

According to an embodiment of the present invention, since radio resources are allocated to each of the first and second communication links based on whether there is interference between the first and second communication links, the IAB device prevents interference between communication links. By minimizing it, communications from devices within the base station and UAM can be relayed.

In addition, according to an embodiment of the present invention, an allocation method for each of a plurality of slots to be allocated to the first communication link and the second communication link is set based on whether there is interference between the first communication link and the second communication link. Therefore, the IAB device can relay communications between devices within the base station and UAM by minimizing interference between communication links.

Combinations of each block of the block diagram and each step of the flow diagram attached to the present invention may be performed by computer program instructions. Since these computer program instructions can be mounted on the encoding processor of a general-purpose computer, special-purpose computer, or other programmable data processing equipment, the instructions performed through the encoding processor of the computer or other programmable data processing equipment are included in each block or block of the block diagram. Each step of the flowchart creates a means to perform the functions described. These computer program instructions may also be stored in computer-usable or computer-readable memory that can be directed to a computer or other programmable data processing equipment to implement a function in a particular way, so that the computer-usable or computer-readable memory The instructions stored in can also produce manufactured items containing instruction means that perform the functions described in each block of the block diagram or each step of the flow diagram. Computer program instructions can also be mounted on a computer or other programmable data processing equipment, so that a series of operational steps are performed on the computer or other programmable data processing equipment to create a process that is executed by the computer, thereby generating a process that is executed by the computer or other programmable data processing equipment. Instructions that perform processing equipment may also provide steps for executing functions described in each block of the block diagram and each step of the flow diagram.

Additionally, each block or each step may represent a module, segment, or portion of code that includes one or more executable instructions for executing specified logical function(s). Additionally, it should be noted that in some alternative embodiments it is possible for the functions mentioned in blocks or steps to occur out of order. For example, two blocks or steps shown in succession may in fact be performed substantially simultaneously, or the blocks or steps may sometimes be performed in reverse order depending on the corresponding function.

The above description is merely an illustrative explanation of the technical idea of the present invention, and those skilled in the art will be able to make various modifications and variations without departing from the essential quality of the present invention. Accordingly, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but rather to explain it, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted in accordance with the claims below, and all technical ideas within the scope equivalent thereto shall be construed as being included in the scope of rights of the present invention.

10: UAM operation system
20: base station
40: terminal
100: IAB device
200: Wireless resource allocation program
210: Interference decision unit
220: Division method decision unit
230: frequency divider
240: Time division unit

Claims (13)

In the method of allocating radio resources to a plurality of communication links performed by an Integrated Access and Backhaul (IAB) device that relays communication with a base station and at least one terminal using a first antenna and a second antenna,
A first communication link that performs communication with the base station through the first antenna installed outside the UAM, and the at least one located inside the UAM through the second antenna installed inside the UAM determining whether there is interference between one terminal and a second communication link performing communication; and
Comprising the step of allocating radio resources for each of the first communication link and the second communication link based on whether there is interference.
A method of allocating wireless resources to a plurality of communication links. According to claim 1,
The step of determining whether there is interference is,
When not transmitting or receiving signals to or from the base station through the first communication link, the first intensity and the first intensity when the second antenna receives data transmitted by the at least one terminal through the second communication link 1 determining a second strength when received by the antenna; and
Based on the difference between the first power and the second power, determining whether interference is occurring in the first communication link due to the second communication link.
A method of allocating wireless resources to a plurality of communication links. According to claim 1,
The step of determining whether there is interference is,
When not transmitting or receiving a signal to or from the at least one terminal through the second communication link, the third intensity and the third intensity when the first antenna receives data transmitted by the base station through the first communication link 2, determining the fourth strength when received by the antenna; and
and determining whether interference is occurring in the second communication link due to the first communication link based on the difference between the third power and the fourth power.
A method of allocating wireless resources to a plurality of communication links. According to claim 1,
The step of allocating the wireless resources is,
When the interference is less than a preset threshold, allocating time resources for each of the first communication link and the second communication link to simultaneously transmit and receive data with each of the base station and the at least one terminal.
A method of allocating wireless resources to a plurality of communication links. According to claim 1,
The step of allocating the wireless resources is,
When the interference is greater than a preset threshold, allocating time resources for each of the first communication link and the second communication link so that each of the base station and the at least one terminal does not transmit and receive data at the same time.
A method of allocating wireless resources to a plurality of communication links. According to claim 1,
The step of allocating the wireless resources is,
When the interference is greater than a preset threshold, allocating frequency resources to each of the first communication link and the second communication link in a frequency division method.
A method of allocating wireless resources to a plurality of communication links. According to clause 6,
The step of allocating the frequency resources is,
For communication with the base station or the at least one terminal, if there is overhead that must be used to transmit control information other than data, the frequency of each of the first communication link and the second communication link is based on the overhead. which involves allocating resources.
A method of allocating wireless resources to a plurality of communication links. A transceiver connected to a first antenna installed outside the UAM (Urban Air Mobility) and a second antenna installed inside the UAM to perform communication with a base station and at least one terminal; and
Whether there is interference between a first communication link that communicates with the base station through the first antenna and a second communication link that communicates with the at least one terminal located inside the UAM through the second antenna. and a processor that determines and allocates radio resources for each of the first communication link and the second communication link based on whether there is interference.
IAB device. According to clause 8,
The processor,
When not transmitting or receiving signals to or from the base station through the first communication link, the first intensity and the first intensity when the second antenna receives data transmitted by the at least one terminal through the second communication link 1 determining a second strength when received by an antenna, and based on the difference between the first strength and the second strength, determining whether interference is occurring in the first communication link due to the second communication link.
IAB device. According to clause 8,
The processor,
When not transmitting or receiving a signal to or from the at least one terminal through the second communication link, the third intensity and the third intensity when the first antenna receives data transmitted by the base station through the first communication link 2. Determining a fourth strength when received by an antenna, and based on the difference between the third strength and the fourth strength, determining whether interference occurs in the second communication link due to the first communication link.
IAB device. According to clause 8,
The processor,
When the interference is less than a preset threshold, allocating time resources for each of the first communication link and the second communication link to simultaneously transmit and receive data with each of the base station and the at least one terminal.
IAB device. According to clause 8,
The processor,
When the interference is greater than a preset threshold, time resources for each of the first communication link and the second communication link are allocated so that each of the base station and the at least one terminal does not transmit and receive data at the same time.
IAB device. A computer program stored on a computer-readable recording medium,
When the computer program is executed by a processor,
Comprising instructions for causing the processor to perform the method according to any one of claims 1 to 8.
computer program.

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