Base station appratus, terminal, and dynamic allocation method

Abstract

The present invention relates to SBFD (Subband non-overlapping Full Duplex) technology, and to a method for dynamically allocating resources for CSI-RS transmission in a communication environment that supports simultaneous transmission of downlink and uplink between frequency subbands.

Description

Technology Field

[0001] The present invention relates to SBFD (Subband non-overlapping Full Duplex) technology, and to a method for dynamically allocating resources for CSI-RS transmission in a communication environment that supports simultaneous transmission of downlink and uplink between frequency subbands. Background Technology

[0002] In NR (New Radio), or 5G systems, which use higher frequency bands and wider bandwidths than existing LTE systems, a function that allows simultaneous use of Tx and Rx using full-duplex communication based on the existing TDD method is being discussed.

[0003] Considering that it is difficult to eliminate interference when the same frequency is used simultaneously for Tx and Rx operations, this is a technology for transmitting downlink and uplink separately by frequency subbands within the slot, and is named SBFD (Subband non-overlapping Full Duplex).

[0004] Meanwhile, even in an SBFD-based communication environment where simultaneous transmission of downlink and uplink between frequency subbands is supported, CSI-RS must be transmitted via the downlink to support channel estimation of the terminal, just as in the existing TDD method.

[0005] However, unlike the existing TDD method, where the entire frequency range of the slot is allocated as a resource for CSI-RS transmission, the SBFD method requires a new resource allocation method that can take into account the characteristics of the downlink and uplink existing together during the same time period. The problem to be solved

[0006] The present invention was created in consideration of the above circumstances, and the objective to be achieved by the present invention is to dynamically allocate resources for CSI-RS transmission in a communication environment that supports simultaneous transmission of downlink and uplink between frequency subbands, in relation to SBFD (Subband non-overlapping Full Duplex) technology. means of solving the problem

[0007] A base station device according to an embodiment of the present invention for achieving the above objective comprises: a memory including instructions; and a processor that, by executing the instructions, changes a slot format based on a network slicing method of a terminal that supports simultaneous transmission of a downlink and an uplink between frequency subbands, and allocates a frequency range of the downlink set for the terminal in the slot format as a channel estimation resource for CSI-RS transmission.

[0008] Specifically, the processor may change the slot format for the terminal to include at least one of a downlink slot for downlink transmission and a simultaneous transmission slot for simultaneous transmission of downlink and uplink.

[0009] Specifically, the channel estimation resource is allocated to the entire frequency range of the downlink slot on a slot basis for the downlink slot, and to the frequency range where the downlink is set on a frequency subband basis within the slot for the simultaneous transmission slot.

[0010] Specifically, the channel estimation resource can be allocated by specifying the starting position of a frequency subband where a downlink is set in the simultaneous transmission slot, and setting the number of resources (RB) required for CSI-RS transmission from the specified starting position.

[0011] Specifically, the channel estimation resource is allocated to different frequency ranges where downlinks are set in the slot format based on the data usage of the terminal, and if the data usage of the terminal exceeds a threshold, it may be allocated to the entire frequency range including the downlink slot and the downlink of the simultaneous transmission slot.

[0012] The above data usage can be verified based on whether the amount of data allocated to a buffer of a specific size has been completely exhausted during a predefined resource allocation time.

[0013] A terminal for achieving the above objective is characterized by comprising: a memory containing instructions; and a processor that receives CSI-RS transmitted by the base station device through the frequency range of the downlink set for the terminal in the slot format when the slot format is changed based on the network slicing method of the terminal in the base station device by executing the instructions to support simultaneous transmission of downlink and uplink between frequency subbands.

[0014] A dynamic resource allocation method performed in a base station device according to an embodiment of the present invention for achieving the above objective is characterized by comprising: a modification step of changing a slot format based on a network slicing method of a terminal that supports simultaneous transmission of a downlink and an uplink between frequency subbands; and an allocation step of allocating a frequency range of a downlink set for the terminal in the slot format as a channel estimation resource for CSI-RS transmission.

[0015] Specifically, the above modification step may change the slot format for the terminal to include at least one of a downlink slot for downlink transmission and a simultaneous transmission slot for simultaneous transmission of downlink and uplink.

[0016] Specifically, the allocation step allocates the entire frequency range of the downlink slot as the channel estimation resource on a slot-by-slot basis for the downlink slot, and for the simultaneous transmission slot, allocates the frequency range where the downlink is set as the channel estimation resource on a frequency subband-by-slot basis.

[0017] Specifically, the allocation step may allocate the channel estimation resource by specifying the starting position of the frequency subband where the downlink is set in the simultaneous transmission slot, and setting the number of resources (RB) required for CSI-RS transmission from the specified starting position.

[0018] Specifically, the allocation step allocates different frequency ranges in which downlinks are set in the slot format as channel estimation resources based on the data usage of the terminal, and if the data usage of the terminal exceeds a threshold, the entire frequency range including the downlink slot and the downlink of the simultaneous transmission slot may be allocated as channel estimation resources. Effects of the invention

[0019] According to the base station device, terminal, and dynamic resource allocation method of the present invention, for a terminal that supports simultaneous transmission of downlink and uplink between frequency subbands, the slot format is changed based on the terminal's network slicing method, and the frequency range of the downlink set for the terminal in the slot format is dynamically allocated as a channel estimation resource for CSI-RS transmission based on the terminal's data usage, thereby enabling efficient utilization of resources. Furthermore, since resources are set based on data usage and network slicing method rather than using the entire resource of the base station device, power saving of the base station device and terminal becomes possible. Brief explanation of the drawing

[0020] FIG. 1 is an illustrative diagram for explaining a slot format of the SBFD method according to an embodiment of the present invention. FIG. 2 is an illustrative diagram for explaining a full-duplex communication environment based on SBFD according to an embodiment of the present invention. FIG. 3 is an exemplary diagram for explaining the configuration of a base station device according to an embodiment of the present invention. FIGS. 4 and 5 are exemplary diagrams illustrating a resource allocation method for CSI-RS transmission according to an embodiment of the present invention. FIG. 6 is an exemplary diagram for explaining the configuration of a terminal according to an embodiment of the present invention. FIG. 7 is a flowchart illustrating a dynamic resource allocation method according to an embodiment of the present invention. Specific details for implementing the invention

[0021] Hereinafter, various embodiments of the present invention will be described with reference to the attached drawings.

[0022] The present invention deals with SBFD (Subband non-overlapping Full Duplex) technology.

[0023] Since both LTE and 5G systems use OFDM as their communication method, they use similar standards, but LTE systems could be configured mainly with fixed formats.

[0024] On the other hand, compared to LTE systems, which are dynamically configurable and primarily use FDD communication methods, 5G systems mainly use TDD methods to increase bandwidth and frequency efficiency.

[0025] However, in the TDD method, as a half-duplex communication method, uplink signals cannot be transmitted when downlink signals are transmitted, and in order to increase speed, it is necessary to use more downlink resources than uplink resources, so the opportunity to allocate uplink resources is relatively reduced.

[0026] In addition, when using the TDD method in environments that use surrounding frequencies or the same frequency, the same slot format must be used.

[0027] For example, in Korea, telecommunication companies are using the same DDDSU slot format by mutual agreement.

[0028] If slot formats differ by operator or carrier, when one operator or base station uses a downlink, another base station may use an uplink; in this case, communication may become difficult at the uplink base station, which has a relatively lower power strength, due to interference from the downlink being used by the other base station.

[0029] Furthermore, when each telecommunications carrier uses different frequencies, interference affecting strong signal transmission between them in adjacent frequency bands is inevitable.

[0030] In this regard, 3GPP Release 18 is conducting research on SBFD (Subband non-overlapping Full Duplex) to compensate for these shortcomings of the TDD method.

[0031] In this SBFD technology, the downlink and uplink can be divided and transmitted by frequency subbands within the slot through a full-duplex communication method that uses the downlink and uplink simultaneously, and as it becomes possible to allocate uplink resources to continuous slot sections, the problems of the existing TDD method can be improved.

[0032] Meanwhile, even in an SBFD-based communication environment where simultaneous transmission of downlink and uplink between frequency subbands is supported, CSI-RS must be transmitted via the downlink to support channel estimation of the terminal, just as in the existing TDD method.

[0033] However, in the case of the SBFD method, unlike the existing TDD method where the entire frequency range of the slot is allocated as a resource for CSI-RS transmission, a new resource allocation method is required to account for the characteristic that the downlink and uplink exist together during the same time period.

[0034] In other words, as shown in Figure 1, in the existing TDD method, the entire frequency range is necessarily allocated for CSI-RS transmission, but in the SBFD method, since the downlink and uplink exist simultaneously at the same time, resources for CSI-RS transmission must be newly allocated for slots that do not use the SBFD method and slots that use the SBFD method.

[0035] Accordingly, in one embodiment of the present invention, a new method is proposed to dynamically allocate resources for CSI-RS transmission in a communication environment that supports simultaneous transmission of downlink and uplink between frequency subbands according to the application of the SBFD method.

[0036] In this regard, FIG. 2 exemplarily shows a full-duplex communication environment based on SBFD according to one embodiment of the present invention.

[0037] As illustrated in FIG. 2, in a full-duplex communication environment based on SBFD according to one embodiment of the present invention, a base station device (100) that supports simultaneous transmission of downlink and uplink between frequency subbands is included.

[0038] The base station device (100) transmits CSI-RS to the terminal (200) using a slot resource (RE) that supports simultaneous transmission of downlink and uplink between frequency bands.

[0039] CSI-RS is essential information transmitted to the terminal (200) via the downlink to provide information that serves as a reference for channel estimation.

[0040] In this regard, 5G systems require more resources for CSI-RS transmission due to various methods for channel estimation and an increase in information, but the fixed-location resources set in existing slot formats are insufficient to support this.

[0041] On the other hand, while increasing resources for CSI-RS transmission may be considered, if such resources are continuously increased, CSI reports will also increase as a result of the feedback, which may actually lead to a negative impact on communication quality.

[0042] Accordingly, in one embodiment of the present invention, a method is proposed to dynamically allocate resources for CSI-RS transmission to a terminal (200) that supports simultaneous transmission of downlink and uplink between frequency subbands according to the application of the SBFD method, and below, the configuration of a base station device (100) and a terminal (200) for realizing this is to be explained in more detail.

[0043] FIG. 3 schematically shows the configuration of a base station device (100) according to one embodiment of the present invention.

[0044] As illustrated in FIG. 3, a base station device (100) according to one embodiment of the present invention may be configured to include a memory containing instructions and a processor that executes instructions within the memory.

[0045] In particular, in the case of a processor according to one embodiment of the present invention, it may have a functional configuration including a change unit (120) and an allocation unit (130) according to an implementation function according to the execution of an instruction.

[0046] In addition, the implementation function of the processor according to one embodiment of the present invention may further include the functional configuration of the verification unit (110) in addition to the configuration described above.

[0047] Above, the base station device (100) according to the embodiment of the present invention can dynamically allocate resources for CSI-RS transmission through the functional configuration of the aforementioned processor, and below, a detailed explanation of each functional configuration for realizing this will be provided.

[0048] The verification unit (110) is responsible for the function of checking whether SBFD is supported.

[0049] More specifically, the verification unit (110) checks whether the terminal (200) supports simultaneous transmission of the downlink and uplink between frequency bands.

[0050] At this time, the verification unit (110) can verify whether the terminal supports simultaneous transmission of downlink and uplink between frequency bands from information regarding capability reported from the terminal (200), and this can be done whenever the terminal (200) attempts Camp On.

[0051] The change unit (120) is responsible for the function of changing (determining) the slot format for the terminal (200).

[0052] More specifically, when the changing unit (120) confirms whether the terminal (200) supports simultaneous transmission of the downlink and uplink between frequency bands, it changes (determines) the slot format for the terminal (200) based on the confirmed result.

[0053] At this time, when the changing unit (120) supports simultaneous transmission of downlink and uplink between frequency bands in the terminal (200), it can change (determine) the slot format differently according to the classification of network slices based on the network slicing method (5QI / QCI) of the terminal (200).

[0054] In this regard, the modification unit (120) may change the slot format to include at least one of a downlink slot (DL dedicated slot) for downlink transmission and a simultaneous transmission slot (SBFD slot) for simultaneous transmission of downlink and uplink, according to the network slicing method of the terminal (200).

[0055] To examine this in more detail, the change unit (120) can change the slot format to a downlink slot (DL-only slot) in accordance with the half-duplex communication method, just like the existing TDD method, and can also maintain the slot format as a simultaneous transmission slot (SBFD slot) in accordance with the full-duplex communication method, or change the slot format to a combination of a downlink slot (DL-only slot) and a simultaneous transmission slot (SBFD slot).

[0056] Here, the change in slot format according to the full-duplex communication method can be performed according to a slicing mode that is divided into static mode and dynamic mode.

[0057] That is, when the slicing mode is static mode, the change unit (120) continuously maintains the slot format as a simultaneous transmission slot (SBFD slot).

[0058] On the other hand, the change unit (120) selectively applies a downlink slot (DL dedicated slot) and a simultaneous transmission slot (SBFD slot) based on whether a terminal following the network slicing method appears when the slicing mode is dynamic mode.

[0059] In other words, for cases where there are no terminals following the Network Slicing method, the slot format is changed to a downlink slot (DL-only slot), and subsequently, when a terminal following the Network Slicing method appears, the slot format can be changed from a downlink slot (DL-only slot) to a simultaneous transmission slot (SBFD slot) structure.

[0060] Meanwhile, as in one embodiment of the present invention, in a communication environment that supports simultaneous transmission of downlink and uplink, it goes without saying that a structure in which a downlink slot (DL-only slot) and a simultaneous transmission slot (SBFD slot) can coexist with different time domains may be adopted.

[0061] For reference, in one embodiment of the present invention, the slot format is described as being changed based on a network slicing method, but it is not limited thereto, and it is known that the slot format can be changed based on a service identified by, for example, the SPID (Subscriber Profile ID) of the terminal (200) according to a policy determined at the core level.

[0062] The allocation unit (130) is responsible for the function of allocating resources for CSI-RS transmission.

[0063] More specifically, when the change of the slot format is completed, the allocation unit (130) allocates a channel estimation resource, which is a resource for CSI-RS transmission, from the frequency range where the downlink is set in the slot format.

[0064] At this time, the allocation unit (130) may, for a slot format changed through dynamic mode, not allocate the frequency range of the downlink set at a fixed position in the slot format as a channel estimation resource, but dynamically allocate different frequency ranges where the downlink is set in the changed slot format to the terminal (200) as channel estimation resources for CSI-RS transmission based on the data usage of the terminal (200).

[0065] Here, the data usage of the terminal (200) can be determined based on whether the amount of data allocated to a buffer of a specific size (e.g., 0 to 100 bytes) has been completely exhausted during a predefined resource allocation time (e.g., 0 to 5000 ms).

[0066] In other words, if the amount of data allocated to the buffer is not fully exhausted during the resource allocation time, it is determined that more data needs to be transmitted than the data threshold (buffer size * resource allocation time), and thus more channel estimated resources can be allocated to the terminal (200).

[0067] In this regard, when the data usage of the terminal (200) exceeds the data threshold (buffer size * resource allocation time), the frequency range of the downlink slot (DL dedicated slot) and the frequency range set as a downlink in the simultaneous transmission slot (SBFD slot) can be allocated as channel estimation resources.

[0068] Of course, for terminals (200) with low data usage, only a portion of the frequency bands set as downlinks in some downlink slots (DL dedicated slots) or simultaneous transmission slots (SBFD slots) can be allocated as channel estimation resources.

[0069] To this end, the allocation unit (130) allocates the entire frequency range of the downlink slot (DL-only slot) as a channel estimation resource on a slot-by-slot basis for the downlink slot (DL-only slot) for the transmission of the downlink, and in particular, for the simultaneous transmission slot (SBFD slot) for the simultaneous transmission of the downlink and uplink, at least one frequency range among the frequency subbands where the downlink is set is allocated as a channel estimation resource on a frequency subband-by-slot basis.

[0070] On the other hand, for slot formats changed through static mode, the allocation unit (130) allocates the frequency range of the downlink set to a fixed position in the slot format as a channel estimation resource.

[0071] Meanwhile, in one embodiment of the present invention, a new configuration as shown in FIG. 4 is proposed to partially allocate channel estimation resources in units of frequency subbands within the slot for such simultaneous transmission slots (SBFD slots).

[0072] In this regard, the frequency domain where the downlink is set in the simultaneous transmission slot (SBFD slot) is divided into up to two frequency domains, such as 'firstOFDMResourceInfrequencyDomain' and 'SecondOFDMResourceInfrequencyDomain', as shown in FIG. 5.

[0073] Accordingly, in the previously exemplified Figure 4, "firstOFDMResourceInfrequencyDomain INTEGER(0..274)," represents the allocation location of the first CSI-RS, "NrofRB1 INTEGER(0..274)," represents the number of resources (RB) from the allocation location of the first CSI-RS, and "SecondOFDMResourceInfrequencyDomain INTEGER(0..274)," represents the allocation location of the second CSI-RS, and "NrofRB2 INTEGER(2..274)," represents the number of resources (RB) from the allocation location of the second CSI-RS.

[0074] Based on this, in one embodiment of the present invention, when it is necessary to partially allocate channel estimation resources for a concurrent transmission slot (SBFD slot), it becomes possible to selectively allocate by specifying 'firstOFDMResourceInfrequencyDomain' or 'SecondOFDMResourceInfrequencyDomain'.

[0075] Thus, the allocation unit (130) can allocate channel estimation resources by specifying the starting position of the frequency subband where the downlink is set in the simultaneous transmission slot (SBFD slot) and setting the number of resources (RB) required for CSI-RS transmission from the specified starting position.

[0076] FIG. 6 schematically shows the configuration of a terminal (200) according to one embodiment of the present invention.

[0077] As illustrated in FIG. 6, a terminal (200) according to one embodiment of the present invention may be configured to include a memory containing instructions and a processor that executes instructions within the memory.

[0078] In particular, in the case of a processor according to one embodiment of the present invention, it may have a functional configuration including a receiving unit (210) according to an implementation function according to the execution of an instruction.

[0079] Above, the terminal (200) according to the embodiment of the present invention can receive CSI-RS through resources dynamically allocated from the base station device (100), and below, a detailed explanation of each function configuration for realizing this will be provided.

[0080] The receiver (210) is responsible for receiving CSI-RS through channel estimation resources dynamically allocated from the base station device (100).

[0081] More specifically, since the receiver (210) supports simultaneous transmission of downlink and uplink between frequency bands, when the slot format is changed based on the network slicing method in the base station device (200), the receiver receives the CSI-RS transmitted by the base station device (100) through the frequency range of the downlink set for the terminal (200) in the changed slot format.

[0082] In this regard, when the base station device (100) confirms whether the terminal (200) supports simultaneous transmission of the downlink and uplink between frequency bands, it changes (determines) the slot format for the terminal (200) based on the confirmed result.

[0083] At this time, when the base station device (100) supports simultaneous transmission of downlink and uplink between frequency bands at the terminal (200), the slot format can be changed (determined) differently according to the classification of network slices based on the network slicing method (5QI / QCI) of the terminal (200).

[0084] To examine this in more detail, the base station device (100) can change the slot format to include at least one of a downlink slot (DL dedicated slot) for downlink transmission and a simultaneous transmission slot (SBFD slot) for simultaneous transmission of downlink and uplink, depending on the network slicing method of the terminal (200).

[0085] More specifically, the base station device (100) can change the slot format to a downlink slot (DL-only slot) in accordance with the half-duplex communication method, as in the existing TDD method, and can also maintain the slot format as a simultaneous transmission slot (SBFD slot) in accordance with the full-duplex communication method, or change the slot format to a combination of a downlink slot (DL-only slot) and a simultaneous transmission slot (SBFD slot).

[0086] Here, the change in slot format according to the full-duplex communication method can be performed according to a slicing mode that is divided into static mode and dynamic mode.

[0087] That is, when the slicing mode is static mode, the base station device (100) continuously maintains the slot format as a simultaneous transmission slot (SBFD slot).

[0088] On the other hand, when the slicing mode is dynamic mode, the base station device (100) selectively applies a downlink slot (DL dedicated slot) and a simultaneous transmission slot (SBFD slot) based on whether a terminal following the network slicing method appears.

[0089] In other words, for cases where there are no terminals following the Network Slicing method, the slot format is changed to a downlink slot (DL-only slot), and subsequently, when a terminal following the Network Slicing method appears, the slot format can be changed from a downlink slot (DL-only slot) to a simultaneous transmission slot (SBFD slot) structure.

[0090] Meanwhile, as in one embodiment of the present invention, in a communication environment that supports simultaneous transmission of downlink and uplink, it goes without saying that a structure in which a downlink slot (DL-only slot) and a simultaneous transmission slot (SBFD slot) can coexist with different time domains may be adopted.

[0091] Furthermore, when the change of the slot format is completed, the base station device (100) allocates a channel estimation resource, which is a resource for CSI-RS transmission, from the frequency range where the downlink is set in the slot format.

[0092] At this time, the base station device (100) can dynamically allocate different frequency ranges where the downlink is set at a fixed position in the slot format as channel estimation resources for CSI-RS transmission to the terminal (200) based on the data usage of the terminal (200), rather than allocating the same frequency range of the downlink set at a fixed position in the slot format as channel estimation resources for the slot format that has been changed through dynamic mode.

[0093] Here, the data usage of the terminal (200) can be determined based on whether the amount of data allocated to a buffer of a specific size (e.g., 0 to 100 bytes) has been completely exhausted during a predefined resource allocation time (e.g., 0 to 5000 ms).

[0094] In other words, if the amount of data allocated to the buffer is not fully exhausted during the resource allocation time, it is determined that more data needs to be transmitted than the data threshold (buffer size * resource allocation time), and thus more channel estimated resources can be allocated to the terminal (200).

[0095] In this regard, when the data usage of the terminal (200) exceeds the data threshold (buffer size * resource allocation time), the frequency range of the downlink slot (DL dedicated slot) and the frequency range set as a downlink in the simultaneous transmission slot (SBFD slot) can be allocated as channel estimation resources.

[0096] Of course, for terminals (200) with low data usage, only a portion of the frequency bands set as downlinks in some downlink slots (DL dedicated slots) or simultaneous transmission slots (SBFD slots) can be allocated as channel estimation resources.

[0097] To this end, the base station device (100) allocates the entire frequency range of the downlink slot (DL-dedicated slot) as a channel estimation resource on a slot-by-slot basis for the downlink slot (DL-dedicated slot) for the transmission of the downlink, and in particular, for the simultaneous transmission slot (SBFD slot) for the simultaneous transmission of the downlink and uplink, at least one frequency range among the frequency subbands where the downlink is set is allocated as a channel estimation resource on a frequency subband-by-slot basis.

[0098] On the other hand, for slot formats changed through static mode, the base station device (100) allocates the frequency range of the downlink set to a fixed position in the slot format as a channel estimation resource.

[0099] As described above, according to the configuration of the base station device (100) and the terminal (200) according to one embodiment of the present invention, for a terminal (200) that supports simultaneous transmission of a downlink and an uplink between frequency bands, the slot format is changed based on the network slicing method of the terminal (200), and the frequency range of the downlink set for the terminal (200) in the slot format is dynamically allocated as a channel estimation resource for CSI-RS transmission based on the data usage of the terminal (200), thereby enabling efficient utilization of resources, so that effects such as prevention of communication quality degradation due to an increase in CSI reports and reduction of power consumption of the base station device (100) and the terminal (200) can be expected.

[0100] Hereinafter, a dynamic resource allocation method according to an embodiment of the present invention will be described with reference to FIG. 7.

[0101] For convenience of explanation, in the following description, the base station device (100) described with reference to FIG. 2 will be referred to as the entity performing the dynamic resource allocation method.

[0102] First, the base station device (100) checks whether the terminal (200) supports simultaneous transmission of downlink and uplink between frequency bands (S110).

[0103] At this time, the base station device (100) can determine whether the terminal supports simultaneous transmission of downlink and uplink between frequency bands from information regarding capability reported from the terminal (200), and this can be done whenever the terminal (200) attempts Camp On.

[0104] Then, when the base station device (100) confirms whether the terminal (200) supports simultaneous transmission of the downlink and uplink between frequency subbands, it changes (determines) the slot format for the terminal based on the confirmed result.

[0105] At this time, when the base station device (100) supports simultaneous transmission of downlink and uplink between frequency bands at the terminal (200), the slot format can be changed (determined) differently according to the classification of network slices based on the network slicing method (5QI / QCI) of the terminal (200).

[0106] In this regard, the base station device (100) may change the slot format to include at least one of a downlink slot (DL dedicated slot) for downlink transmission and a simultaneous transmission slot (SBFD slot) for simultaneous transmission of downlink and uplink, depending on the network slicing method of the terminal (200).

[0107] To examine this in more detail, the base station device (100) can change the slot format to a downlink slot (DL-only slot) in accordance with the half-duplex communication method, just like the existing TDD method, and also maintain the slot format as a simultaneous transmission slot (SBFD slot) in accordance with the full-duplex communication method, or change the slot format to a combination of a downlink slot (DL-only slot) and a simultaneous transmission slot (SBFD slot) (S120-S150).

[0108] Here, the change in slot format according to the full-duplex communication method can be performed according to a slicing mode that is divided into static mode and dynamic mode.

[0109] That is, when the slicing mode is dynamic mode, the base station device (100) selectively applies a downlink slot (DL dedicated slot) and a simultaneous transmission slot (SBFD slot) based on whether a terminal following the network slicing method appears.

[0110] In other words, for cases where there are no terminals following the Network Slicing method, the slot format is changed to a downlink slot (DL-only slot), and subsequently, when a terminal following the Network Slicing method appears, the slot format can be changed from a downlink slot (DL-only slot) to a simultaneous transmission slot (SBFD slot) structure.

[0111] Meanwhile, as in one embodiment of the present invention, in a communication environment that supports simultaneous transmission of downlink and uplink, it goes without saying that a structure in which a downlink slot (DL-only slot) and a simultaneous transmission slot (SBFD slot) can coexist with different time domains may be adopted.

[0112] On the other hand, when the slicing mode is static mode, the base station device (100) continuously maintains the slot format as a simultaneous transmission slot (SBFD slot).

[0113] For reference, in one embodiment of the present invention, the slot format is described as being changed based on a network slicing method, but it is not limited thereto, and it is known that the slot format can be changed based on a service identified by, for example, the SPID (Subscriber Profile ID) of the terminal (200) according to a policy determined at the core level.

[0114] Afterward, when the change of the slot format is completed, the base station device (100) allocates a channel estimation resource, which is a resource for CSI-RS transmission, from the frequency range where the downlink is set in the slot format.

[0115] At this time, the base station device (100) may, for a slot format changed through dynamic mode, not allocate the frequency range of the downlink set at a fixed position in the slot format as a channel estimation resource, but dynamically allocate different frequency ranges where the downlink is set in the changed slot format to the terminal (200) as channel estimation resources for CSI-RS transmission based on the data usage of the terminal (200) (S160-S170).

[0116] In this regard, the data usage of the terminal (200) can be determined based on whether the amount of data allocated to a buffer of a specific size (e.g., 0 to 100 bytes) has been completely exhausted during a predefined resource allocation time (e.g., 0 to 5000 ms).

[0117] In other words, if the amount of data allocated to the buffer is not fully exhausted during the resource allocation time, it is determined that more data needs to be transmitted than the data threshold (buffer size * resource allocation time), and thus more channel estimated resources can be allocated to the terminal (200).

[0118] For example, if the data usage of the terminal (200) exceeds the data threshold (buffer size * resource allocation time), the frequency range of the downlink slot (DL dedicated slot) and the frequency range set as the downlink in the simultaneous transmission slot (SBFD slot) can be allocated as channel estimation resources.

[0119] Of course, for terminals (200) with low data usage, only a portion of the frequency bands set as downlinks in some downlink slots (DL dedicated slots) or simultaneous transmission slots (SBFD slots) can be allocated as channel estimation resources.

[0120] To this end, the base station device (100) allocates the entire frequency range of the downlink slot (DL-dedicated slot) as a channel estimation resource on a slot-by-slot basis for the downlink slot (DL-dedicated slot) for the transmission of the downlink, and in particular, for the simultaneous transmission slot (SBFD slot) for the simultaneous transmission of the downlink and uplink, at least one frequency range among the frequency subbands where the downlink is set is allocated as a channel estimation resource on a frequency subband-by-slot basis.

[0121] Meanwhile, in one embodiment of the present invention, a new configuration as shown in FIG. 4, which was previously exemplified, is proposed to partially allocate channel estimation resources in units of frequency subbands within the slot for such simultaneous transmission slots (SBFD slots).

[0122] In this regard, the frequency domain where the downlink is set in the simultaneous transmission slot (SBFD slot) is divided into up to two frequency domains, such as 'firstOFDMResourceInfrequencyDomain' and 'SecondOFDMResourceInfrequencyDomain', as shown in Fig. 5, which was exemplified earlier.

[0123] Accordingly, in the previously exemplified Figure 4, "firstOFDMResourceInfrequencyDomain INTEGER(0..274)," represents the allocation location of the first CSI-RS, "NrofRB1 INTEGER(0..274)," represents the number of resources (RB) from the allocation location of the first CSI-RS, and "SecondOFDMResourceInfrequencyDomain INTEGER(0..274)," represents the allocation location of the second CSI-RS, and "NrofRB2 INTEGER(2..274)," represents the number of resources (RB) from the allocation location of the second CSI-RS.

[0124] Based on this, in one embodiment of the present invention, when it is necessary to partially allocate channel estimation resources for a concurrent transmission slot (SBFD slot), it becomes possible to selectively allocate by specifying 'firstOFDMResourceInfrequencyDomain' or 'SecondOFDMResourceInfrequencyDomain'.

[0125] Thus, the base station device (100) can allocate channel estimation resources by specifying the starting position of the frequency subband where the downlink is set in the simultaneous transmission slot (SBFD slot) and setting the number of resources (RB) required for CSI-RS transmission from the specified starting position.

[0126] On the other hand, for slot formats changed through static mode, the base station device (100) allocates the frequency range of the downlink set to a fixed position in the slot format as a channel estimation resource (S180).

[0127] As described above, according to the dynamic resource allocation method according to one embodiment of the present invention, for a terminal (200) that supports simultaneous transmission of a downlink and an uplink between frequency subbands, the slot format is changed based on the network slicing method of the terminal (200), and the frequency range of the downlink set for the terminal (200) in the slot format is dynamically allocated as a channel estimation resource for CSI-RS transmission based on the data usage of the terminal (200), thereby enabling efficient utilization of resources, so that effects such as prevention of communication quality degradation due to an increase in CSI reports and reduction of power consumption of the base station device (100) and the terminal (200) can be expected.

[0128] A dynamic resource allocation method according to one embodiment of the present invention may be implemented in the form of program instructions that can be executed through various computer means and recorded on a computer-readable medium. The computer-readable medium may include program instructions, data files, data structures, etc., either individually or in combination. The program instructions recorded on the medium may be those specifically designed and configured for the present invention, or those known and available to those skilled in the art of computer software. Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks, and magnetic tapes; optical recording media such as CD-ROMs and DVDs; magneto-optical media such as floptical disks; and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, and flash memory. Examples of program instructions include machine code, such as that generated by a compiler, as well as high-level language code that can be executed by a computer using an interpreter, etc. The hardware devices described above may be configured to operate as one or more software modules to perform the operation of the present invention, and vice versa.

[0129] Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited to the above-described embodiments, and the technical concept of the present invention extends to the scope in which various modifications or alterations are possible by anyone with ordinary knowledge in the technical field to which the present invention belongs, without departing from the gist of the present invention as claimed in the following claims. Industrial applicability

[0130] According to the base station device, terminal, and dynamic resource allocation method of the present invention, in relation to Subband Non-Overlapping Full Duplex (SBFD) technology, in a communication environment that supports simultaneous transmission of downlink and uplink between frequency subbands, resources for CSI-RS transmission can be dynamically allocated. Since this overcomes the limitations of existing technology, it is an invention with industrial applicability, as it not only provides sufficient possibility for the commercialization or business of the applied device rather than just the use of related technology, but is also practically and clearly implementable. Explanation of the symbols

[0131] 100: Base station device 110: Confirmation Section 120: Modification Section 130: Allocation section 200: Terminal 210: Receiver

Claims

Claim 1 A base station device comprising: a memory including instructions; and a processor that, by executing the instructions, changes a slot format based on a network slicing method of a terminal that supports simultaneous transmission of a downlink and an uplink between frequency subbands, and allocates a frequency range of the downlink set for the terminal in the slot format as a channel estimation resource for CSI-RS transmission, wherein the processor changes the slot format to include at least one of a downlink slot for downlink transmission and a simultaneous transmission slot for simultaneous transmission of a downlink and an uplink for the terminal, and, based on the data usage of the terminal, allocates the entire frequency range of the downlink slot and the frequency range set as a downlink in the simultaneous transmission slot as the channel estimation resource when the data usage of the terminal exceeds a threshold, and allocates a part of the downlink slot or a part of the frequency subband set as a downlink in the simultaneous transmission slot as the channel estimation resource when the data usage of the terminal is less than the threshold. Claim 2 delete Claim 3 A base station device according to claim 1, wherein the channel estimation resource is allocated to the entire frequency range of the downlink slot on a slot-by-slot basis for the downlink slot, and to the frequency range where the downlink is set on a frequency subband-by-slot basis for the simultaneous transmission slot. Claim 4 A base station device according to claim 3, wherein the channel estimation resource is allocated by specifying the starting position of a frequency subband where a downlink is set in the simultaneous transmission slot, and setting the number of resources (RB) required for CSI-RS transmission from the specified starting position. Claim 5 delete Claim 6 A terminal comprising: a memory including a command; and a processor that, by executing the command, changes a slot format based on a network slicing method of the terminal in a base station device to support simultaneous transmission of a downlink and an uplink between frequency subbands, and identifies a resource allocated to the terminal in at least a portion of the frequency domain of the slot format, wherein the slot format is changed to include at least one of a downlink slot for downlink transmission and a simultaneous transmission slot for simultaneous transmission of a downlink and an uplink for the terminal, and wherein the processor identifies the entire frequency domain of the downlink slot and the frequency domain set as a downlink in the simultaneous transmission slot as the channel estimation resource when the data usage of the terminal exceeds a threshold, and identifies a portion of the downlink slot or a portion of the frequency subband set as a downlink in the simultaneous transmission slot as the channel estimation resource when the data usage of the terminal is less than the threshold. Claim 7 A dynamic resource allocation method performed in a base station device, comprising: a modification step for a terminal that supports simultaneous transmission of a downlink and an uplink between frequency subbands, changing a slot format based on a network slicing method of said terminal; and an allocation step for allocating at least a portion of the frequency domain of said slot format as a resource of said terminal, wherein the modification step changes the slot format for said terminal to include at least one of a downlink slot for downlink transmission and a simultaneous transmission slot for simultaneous transmission of a downlink and an uplink; and the allocation step is characterized by, based on the data usage of said terminal, allocating the entire frequency domain of said downlink slot and the frequency domain set as a downlink in said simultaneous transmission slot as a channel estimation resource when the data usage of said terminal exceeds a threshold, and allocating a portion of said downlink slot or a portion of the frequency subband set as a downlink in said simultaneous transmission slot as a channel estimation resource when the data usage of said terminal is less than a threshold. Claim 8 delete Claim 9 A dynamic resource allocation method according to claim 7, wherein the allocation step allocates the entire frequency range of the downlink slot as the channel estimation resource on a slot-by-slot basis for the downlink slot, and allocates the frequency range where the downlink is set as the channel estimation resource on a frequency subband-by-slot basis for the simultaneous transmission slot. Claim 10 A dynamic resource allocation method according to claim 9, wherein the allocation step is characterized by allocating the channel estimation resource in a manner that specifies the starting position of a frequency subband where a downlink is set in the simultaneous transmission slot, and sets the number of resources (RB) required for CSI-RS transmission from the specified starting position. Claim 11 delete

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