Terminal, wireless base station and wireless communication method

Abstract

The UE (200) receives capability query information of the UE (200) from the network, and determines a candidate combination of frequency bands supported by the UE (200) based on the capability query information. If the combination is a fallback band combination, the UE (200) excludes the combination from a candidate list of combinations.

Description

Technical Field

[0001] The present invention relates to a terminal for performing wireless communication, and more particularly to a terminal, a wireless base station and a wireless communication method capable of determining a combination of supportable frequency bands. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized Long Term Evolution (LTE), promoted the standardization of LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced) with the goal of further speeding up LTE, and also promoted the standardization of the fifth generation mobile communication system (5th generation mobile communication system) (also known as 5G, New Radio (NR) or Next Generation (NG)).

[0003] 3GPP Release 15 specifies a method for notifying a combination of frequency bands (hereinafter referred to as bands) in which a terminal (User Equipment, UE) can transmit and receive wireless signals (specifically, carriers) (Non-Patent Document 1).

[0004] Furthermore, in 3GPP Release 15, a fallback band combination is defined as a terminal capability (Capability) (Non-Patent Document 2).

[0005] Fallback band combination is a combination of bands generated from other band combinations by releasing the uplink (UL) setting of at least one secondary cell, or a secondary cell or a secondary cell group (SCG). A combination of non-contiguous bands within a band may not be considered as a fallback band combination of a continuous band combination within a band.

[0006] Prior art literature

[0007] Non-patent literature

[0008] Non-patent document 1: 3GPP TS 38.331 V15.8.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Radio Resource Control (RRC) protocol specification (version 15), 3GPP, December 2019

[0009] Non-patent document 2: 3GPP TS 38.306 V15.8.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; User Equipment (UE) radio access capabilities (Release 15), 3GPP, December 2019 Summary of the invention

[0010] According to the current 3GPP Release 15 specification, in the case of a fallback band combination that is considered to have the same capability as other band combinations, the terminal excludes the fallback band combination from a list of candidate band combinations.

[0011] In this case, since part of the independent (SA) band combination of NR, which is the fallback band combination of other NE-DC (NR-E-UTRA Dual Connectivity), is deleted, the SA band combination of NR in the NR container becomes incomplete.

[0012] In order to obtain all the SA band combinations supported by the terminal, the network needs to combine the SA band combination of the NR container with the SA band combination of the MR-DC (Multi-RAT Dual Connectivity) container, which complicates the installation.

[0013] Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a terminal, a wireless base station, and a wireless communication method that can avoid complication of network implementation related to processing of band combination.

[0014] One embodiment of the present disclosure provides a terminal (UE 200), the terminal (UE 200) comprising: a receiving unit (capability information processing unit 250) which receives capability query information of the terminal from a network; and a control unit (control unit 240) which determines candidates for a combination of frequency bands supported by the terminal based on the capability query information, wherein the control unit excludes the combination from a candidate list of the combination when the combination is a fallback band combination.

[0015] One embodiment of the present disclosure provides a wireless base station including: a transmitting unit that transmits capability query information of a terminal to a terminal; and a receiving unit that receives capability information after excluding a combination of frequency bands supported by the terminal from a candidate list of the combination when the combination of frequency bands supported by the terminal is a fallback band combination.

[0016] One embodiment of the present disclosure provides a wireless communication method, which includes the following steps: a receiving step of receiving capability query information of a terminal; and a determining step of determining, based on the capability query information, a candidate combination of frequency bands supported by the terminal, wherein in the determining step, if the combination is a fallback band combination, the combination is excluded from a candidate list of the combination. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a diagram schematically showing the overall structure of the wireless communication system 10 .

[0018] Figure 2 is a functional block diagram of UE 200.

[0019] Figure 3 This is a diagram showing an example of a notification sequence of UE capability information (UE Capability Information).

[0020] Figure 4 This is a diagram showing the flow of operations related to reporting of UE Capability Information of UE 200.

[0021] Figure 5 is a diagram showing an example of a combination of frequency bands reported by the UE 200 .

[0022] Figure 6 This is a diagram showing an example of the hardware configuration of the UE 200 . DETAILED DESCRIPTION

[0023] Hereinafter, the embodiments will be described based on the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and the description thereof will be appropriately omitted.

[0024] (1) Overall schematic structure of wireless communication system

[0025] Figure 1 The figure is a schematic diagram of the overall structure of the wireless communication system 10 involved in this embodiment. The wireless communication system 10 is a wireless communication system based on Long Term Evolution (LTE) and 5G New Radio (NR), and includes a radio access network 20 (hereinafter referred to as RAN 20) and a user terminal 200 (User Equipment 200, hereinafter referred to as UE 200).

[0026] The RAN 20 is a radio access network including an Evolved Universal Terrestrial Radio Access Network (E-UTRAN) and a Next Generation-Radio Access Network (NG-RAN).

[0027] RAN 20 includes radio base stations 100A and 100B (hereinafter referred to as eNB 100A and gNB 100B). The specific configuration of the wireless communication system 10 including the number of eNBs, gNBs, and UEs is not limited to Figure 1 Example shown.

[0028] RAN 20 actually includes multiple RAN Nodes, specifically, LTE eNBs and NR gNBs, and is connected to a core network (EPC / 5GC, not shown) based on LTE / 5G. In addition, RAN 20 and the core network can be simply described as "network".

[0029] The eNB 100A, gNB 100B and UE 200 perform wireless communication based on LTE or 5G. The eNB 100A, gNB 100B and UE 200 can support MIMO for generating a beam with higher directivity by controlling wireless signals transmitted from multiple antenna elements, carrier aggregation (CA) for bundling and using multiple component carriers (CCs), and dual connectivity (DC) for simultaneously communicating between the UE and multiple NG-RAN Nodes.

[0030] In particular, the wireless communication system 10 supports NR-E-UTRA Dual Connectivity (NE-DC) as DC between LTE and NR. In addition, the wireless communication system 10 may also support other DCs, specifically, NR-NR Dual Connectivity (NR-NR Dual Connectivity: NR-DC) or E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity: EN-DC).

[0031] UE 200 can combine the numbers of the frequency bands supported by the terminal (band numbers) to generate a band combination (Band combination), and notify the network of the generated Band combination as capability information (UECapability Information).

[0032] (2) Functional block structure of wireless communication system

[0033] Next, a functional block configuration of the wireless communication system 10 will be described. Specifically, a functional block configuration of the UE 200 will be described. Figure 2 is a functional block diagram of UE 200.

[0034] like Figure 2 As shown, the UE 200 includes a radio transmission unit 210 , a radio reception unit 220 , a band combination determination unit 230 , a control unit 240 , and a capability information processing unit 250 .

[0035] The radio transmission unit 210 transmits an uplink signal (UL signal) based on NR, and the radio reception unit 220 receives a downlink signal (DL signal) based on NR.

[0036] Specifically, the wireless transmission unit 210 and the wireless reception unit 220 perform wireless communication via a control channel or a data channel.

[0037] The control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), PBCH (Physical Broadcast Channel) and the like.

[0038] In addition, data channels include PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), and the like.

[0039] In addition, reference signals include demodulation reference signals (DMRS), sounding reference signals (SRS), phase tracking reference signals (PTSS), and channel state information-reference signals (CSI-RS). In addition, signals may include channels and reference signals. In addition, data refers to data sent via a data channel.

[0040] The band combination determination unit 230 determines a combination of frequency bands supported by the UE 200. Specifically, the band combination determination unit 230 determines a combination of frequency bands that can transmit and receive wireless signals by the UE 200. In addition, the wireless signal can be replaced by a carrier, a frequency carrier, or a component carrier (CC).

[0041] In addition, the frequency band can be simply expressed as a band or a frequency band, etc.

[0042] The band combination determination unit 230 combines the numbers of the supported frequency bands (band numbers) to generate one Bandcombination. The band combination determination unit 230 can generate a plurality of such Bandcombinations.

[0043] In addition, the combination of frequency bands may include a fallback band combination. The fallback band combination may be interpreted as a band combination generated by a combination of other bands by releasing the uplink (UL) setting of at least one secondary cell (SCell) or a secondary cell or secondary cell group (SCG).

[0044] The control unit 240 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 240 causes the band combination determination unit 230 to determine a combination of frequency bands supported by the UE 200 based on the frequency band information.

[0045] Specifically, the control unit 240 can determine candidate frequency band combinations supported by the UE 200 based on the capability inquiry (UECapabilityEnquiry) of the UE 200 received by the capability information processing unit 250 .

[0046] In determining the candidate band combinations, if the frequency band combination is not a fallback band combination, the control unit 240 may exclude (remove) the frequency band combination from the candidate list of the combination (specifically, the list of candidate band combinations).

[0047] More specifically, when the determined frequency band combination is regarded as a fallback band combination having the same capability as other band combinations and the frequency band combination is not a Fallback band combination, the control unit 240 may exclude the frequency band combination from the list of candidate band combinations.

[0048] More specifically, in Chapter 5.6.1.4 of 3GPP TS38.331, it can be expressed as follows.

[0049] The UE shall:…

[0050] 1>for each band combination included in the list of "candidate bandcombinations":

[0051] 2>if it is regarded as a fallback band combination with the samecapabilities of another band combination included in the list of "candidateband combinations",and

[0052] 2>if it is not the fallback band combination resulted from another band combination by releasing SCG:

[0053] The capability information processing unit 250 processes information (UECapabilityInformation) related to the capability of the UE 200. Specifically, the capability information processing unit 250 can receive UECapabilityEnquiry, which is information for inquiring about the capability of the UE 200, from the network. In this embodiment, the capability information processing unit 250 constitutes a receiving unit.

[0054] Furthermore, the capability information processing unit 250 can transmit information (UE Capability Information) indicating the capability related to wireless communication and the like of the UE 200 to the network.

[0055] The capability information processing unit 250 can transmit and receive UECapabilityEnquiry and UECapabilityInformation using signaling of a higher layer (for example, a radio resource control layer (RRC)).

[0056] In this embodiment, the capability information processing unit 250 can transmit the capability information including the band combination. In addition, as described above, the capability information of the band combination can include the fallback band combination.

[0057] (3) Operation of wireless communication system

[0058] Next, the operation of the radio communication system 10 will be described. Specifically, the operation related to the report of the Bandcombination performed by the UE 200 will be described.

[0059] (3.1) Communication sequence

[0060] Figure 3 An example of the notification sequence of UE Capability Information is shown in FIG. Figure 3 As shown, UE 200 responds to a query (UE Capability Enquiry) from the network (S10) and returns UE Capability Information (S20).

[0061] The UE Capability Information may include a combination of frequency bands that the UE 200 can support (specifically, information on a Band combination including a Fallback band combination).

[0062] Figure 52 shows an example of a combination of frequency bands reported by UE 200. Specifically, Figure 5 In the figure, a combination of frequency bands (BC) included in the MR-DC (Multi-RAT Dual Connectivity) container is shown, specifically, a combination of BCs used for NE-DC (NR-E-UTRA Dual Connectivity) and BCs included in the NR container (NR's independent (SA) configuration) is shown.

[0063] (3.2) UE Capability Information reporting actions

[0064] Figure 4 FIG. 2 shows an operation flow related to reporting of UE Capability Information of UE 200. Figure 4 As shown, UE 200 receives UECapabilityEnquiry (S110).

[0065] UE 200 determines a combination of supportable frequency bands, and judges whether the combination is regarded as a fallback band combination having the same capability as other band combinations ( S115 ).

[0066] The same capabilities may be interpreted as the same capabilities, or may be interpreted as capabilities that are not necessarily the same but can be substantially treated as the same.

[0067] The capability is not particularly limited as long as it is the capability that affects wireless communication, such as the bandwidth of the frequency band, the resource blocks in the associated frequency direction (and / or time direction), etc.

[0068] For another band combination, it is sufficient that at least a part of the bands constituting the determined combination is different. In addition, another band combination may be included in the list of candidate band combinations.

[0069] When the combination is regarded as a fallback band combination having the same capability as other band combinations, the UE 200 determines whether the combination is a Fallback band combination ( S120 ).

[0070] Specifically, the UE 200 determines whether the combination is a combination of bands generated from a combination of other bands by releasing the uplink (UL) configuration of at least one secondary cell (SCell) or a secondary cell or a secondary cell group (SCG).

[0071] In addition, the release is not necessarily limited to the UL configuration of the SCell, and for example, it can be the release of any configuration associated with the SCG.

[0072] If the combination is not a Fallback band combination, the UE 200 excludes the combination from the list of candidate band combinations (S130).

[0073] Specifically, the corresponding combination is eliminated from a list of candidate band combinations that can include combinations of multiple frequency bands.

[0074] UE 200 transmits UE Capability Information including the combination of frequency bands (Band Combination) to the network based on the contents of the list of candidate band combinations determined by the process up to S130 ( S140 ).

[0075] The network (specifically, the RAN 20 ) performs scheduling of the UE 200 and the like according to the UE Capability Information received from the UE 200 .

[0076] (4) Action and Effect

[0077] According to the above-described embodiment, the following effects can be obtained: Specifically, when the determined frequency band combination is not a Fallback band combination, UE 200 can exclude the combination from a list of candidate band combinations.

[0078] Specifically, when the determined frequency band combination is regarded as a fallback band combination having the same capability as other band combinations and the frequency band combination is not a Fallback band combination, UE 200 may exclude the frequency band combination from the list of candidate band combinations.

[0079] Thus, even when the determined frequency band combination is regarded as a fallback band combination having the same capability as other band combinations, the UE 200 does not simply exclude the fallback band combination from the candidate list of band combinations, but excludes the frequency band combination from the list of candidate band combinations when it is obviously not a Fallback band combination.

[0080] Therefore, if Figure 5 As shown in the example, for example, it is possible to avoid a situation where a part of the independent (SA) band combination of NR is deleted and the SA band combination of NR in the NR container becomes incomplete. As a result, the network does not need to combine the SA band combination of the NR container with the SA band combination of the MR-DC (Multi-RAT Dual Connectivity) container in order to obtain all the SA band combinations supported by UE200.

[0081] That is, according to the UE 200, it is possible to avoid complication of network installation related to the process of band combination.

[0082] (5) Other Implementation Methods

[0083] As mentioned above, although the content of this invention was demonstrated based on an Example, this invention is not limited to these descriptions, and it is obvious to a person skilled in the art that various deformation|transformation and improvement can be made.

[0084] For example, in the above-mentioned embodiment, NE-DC is described as an example, but when it is also applied to other DCs (NR-DC, EN-DC), the above-mentioned actions can also be applied to the DC.

[0085] The block diagram used in the description of the above-mentioned embodiment ( Figure 2 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0086] Functionally, it includes judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but is not limited to these. For example, the functional block (structural part) that enables the sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0087] Furthermore, the above-mentioned UE 200 may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 6 2 is a diagram showing an example of the hardware configuration of UE 200. Figure 6 As shown, UE 200 may also be configured as a computer device including a processor 1001, a memory 1002 (memory), a storage 1003 (storage), a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0088] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware structure of the device may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0089] Each functional block of UE 200 (see Figure 2 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0090] In addition, each function in UE 200 is implemented by the following method: predetermined software (program) is read into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of the reading and writing of data in memory 1002 and storage 1003.

[0091] The processor 1001 controls the entire computer by, for example, executing an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.

[0092] In addition, the processor 1001 reads a program (program code), a software module or data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes a computer to perform at least a part of the actions described in the above-mentioned embodiments is used. In addition, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0093] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc. that can execute a method according to an embodiment of the present disclosure.

[0094] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compressed disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, other appropriate media such as a database, a server, etc. that includes at least one of the memory 1002 and the memory 1003.

[0095] The communication device 1004 is hardware (transceiver) used to communicate between computers via at least one of a wired network and a wireless network, and may also be called a network device, a network controller, a network card, a communication module, etc.

[0096] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0097] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0098] In addition, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0099] In addition, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

[0100] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI)), high-level signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block: MIB, System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0101] Each form / embodiment described in the present disclosure may also be applied to at least one of Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate systems, and a next-generation system extended therefrom. In addition, a combination of a plurality of systems (for example, a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0102] The processing procedures, timings, processes, etc. of each form / implementation described in this disclosure may be changed in order without contradiction. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0103] In the present disclosure, specific actions performed by a base station are sometimes performed by its upper node depending on the situation. In a network consisting of one or more network nodes having a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, consider MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0104] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0105] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0106] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0107] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched depending on the execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., notification of the scheduled information is not performed).

[0108] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0109] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0110] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0111] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0112] As used in this disclosure, the terms "system" and "network" may be used interchangeably.

[0113] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0114] The names used for the above parameters are not limiting in any way. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0115] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes, a base station is also referred to as a macro cell, a small cell, a micro cell, a pico cell, etc.

[0116] A base station can accommodate one or more (for example, 3) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head: RRH).

[0117] The terms "cell" or "sector" refer to a part or the entirety of a coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0118] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0119] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0120] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0121] In addition, the base station in the present disclosure may also be replaced by a mobile station (user terminal, the same below). For example, various forms / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, may also be referred to as device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0122] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0123] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as subframes.

[0124] A subframe may also be composed of one or more time slots in the time domain. A subframe may be a fixed time length (eg, 1 ms) that is independent of numerology.

[0125] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame structure, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, and the like.

[0126] A slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0127] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0128] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0129] For example, 1 subframe can be called a transmission time interval (TTI), multiple consecutive subframes can also be called a TTI, and 1 time slot or 1 mini time slot can also be called a TTI. That is, at least one of the subframe and the TTI can be a subframe (1ms) in the existing LTE, or a period shorter than 1ms (for example, 1-13 code elements), or a period longer than 1ms. In addition, the unit representing TTI can be a time slot, a mini time slot, etc. instead of a subframe.

[0130] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules the allocation of wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of TTI is not limited to this.

[0131] TTI can be a transmission time unit for data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit for scheduling, link adaptation, etc. In addition, when TTI is assigned, the time interval (e.g., the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0132] In addition, when 1 time slot or 1 mini time slot is called TTI, more than one TTI (ie, more than one time slot or more than one mini time slot) can constitute the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can be controlled.

[0133] A TTI having a time length of 1 ms is also called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-time slot, a sub-time slot, a time slot, etc.

[0134] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be replaced with a TTI having a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be replaced with a TTI length that is smaller than the long TTI (longTTI) and has a TTI length of more than 1ms.

[0135] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers contained in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers contained in an RB may also be determined according to the parameter set.

[0136] In addition, the time domain of an RB may include one or more symbols, and may be the length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may be composed of one or more resource blocks, respectively.

[0137] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0138] In addition, a resource block may be composed of one or more resource elements (RE). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

[0139] Bandwidth Part (BWP) (also called partial bandwidth, etc.) represents a subset of contiguous common RBs (common resource blocks) for a parameter set in a certain carrier. Here, the common RB can be determined by the index of the RB based on the common reference point of the carrier. PRBs are defined in a certain BWP and numbered within the BWP.

[0140] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0141] At least one of the set BWPs may be active, and it is not assumed that the UE transmits or receives a predetermined signal / channel outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may be replaced with "BWP".

[0142] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.

[0143] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, for two elements, it may be considered that they are "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region, etc.

[0144] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applied standard.

[0145] The phrase "according to" used in the present disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to".

[0146] The "unit" in the configuration of each of the above-mentioned devices may be replaced with a "section", "circuit", "device" or the like.

[0147] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not necessarily limit the number and order of these elements. These terms are used in this disclosure as a simple method to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be used here or that the first element must precede the second element in any form.

[0148] When the terms "include," "including," and variations thereof are used in the present disclosure, these terms are intended to be inclusive, as is the term "comprising." Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0149] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes the case where the noun following the article is in plural form.

[0150] The terms "determining" and "determining" used in the present disclosure sometimes also include situations of various actions. "Determining" and "determining" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include considering matters that have been received (for example, receiving information), transmitted (for example, transmitting information), input, output, accessed (for example, accessed data in memory) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include considering matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "judged" or "determined". That is, "determining" and "determining" may include matters that have been "judged" or "determined" by any action. In addition, the word “determine” can also be replaced by “assuming”, “expecting”, “considering”, etc.

[0151] In the present disclosure, the term "A and B are different" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" are also interpreted in the same way as "different".

[0152] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0153] Description of labels:

[0154] 10 Wireless Communication Systems

[0155] 20 RAN

[0156] 100A eNB

[0157] 100B gNB

[0158] 200 UE

[0159] 210 Wireless Transmission Unit

[0160] 220 Wireless receiving unit

[0161] 230 Band combination determination unit

[0162] 240 Control Department

[0163] 250 Capability Information Processing Department

[0164] 1001 Processor

[0165] 1002 Memory

[0166] 1003 Memory

[0167] 1004 Communication device

[0168] 1005 Input Device

[0169] 1006 Output Device

[0170] 1007 Bus

Claims

1. A terminal, wherein: The terminal has: A receiving unit, configured to receive capability query information of the terminal; as well as a control unit that determines candidates for a combination of frequency bands supported by the terminal based on the capability query information, The control unit excludes the combination from the candidate list of the combination, when the combination is a fallback band combination but is not a fallback band combination generated from another band combination based on the release of a secondary cell group.

2. A wireless base station, wherein: The wireless base station has: A sending unit, configured to send the capability query information of the terminal to the terminal; as well as A receiving unit receives capability information excluding the combination from the candidate list of the combination when the combination of frequency bands supported by the terminal is a fallback band combination but is not a fallback band combination generated from other band combinations based on the release of a secondary cell group.

3. A wireless communication method, wherein: The wireless communication method comprises the following steps: A receiving step, receiving capability query information of a terminal; as well as a determining step of determining a candidate combination of frequency bands supported by the terminal according to the capability query information, In the determination step, if the combination is a fallback band combination but is not a fallback band combination generated from other band combinations based on the release of a secondary cell group, the combination is excluded from the candidate list of the combination.

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