RU2787468C1 - User equipment - Google Patents

Abstract

FIELD: wireless communication.

SUBSTANCE: invention relates to wireless communication. In the case of allocating only a plurality of secondary component carriers in a predetermined band, the user equipment selects a secondary component carrier, which is the target of reception quality measurement, among the plurality of secondary component carriers. The user equipment transmits the measurement result of the reception quality.

EFFECT: allowing the user equipment to measure the proper reception quality of carrier aggregation at any time using the intra-frequency band in a predetermined frequency range (FR).

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Description

USER EQUIPMENT

The field of technology to which the invention belongs

The present invention relates to radio communications and, in particular, to user equipment that performs carrier aggregation using a plurality of component carriers.

State of the art

The 3rd ^Generation Partnership Project (3GPP) defines the specification for the LTE (Long Term Evolution) scheme and the LTE-A (LTE-Advanced or "Advanced 1_TE" scheme) scheme (hereinafter, they are summarized referred to as the LTE scheme) in order to further improve the speed in the LTE scheme. In addition, 3GPP also considers the specification of a subsequent system in the LTE scheme, referred to as 5G NR technology ("New Radio") or Next Generation technology (NG).

Among other things, in the 3GPP technology standard version 15, for each frequency range (FR, from the English Frequency Range), the number of cells, the number of blocks of the synchronization signal (SS, from the English Signal Synchronization) / physical broadcast channel (PBCH, from the English. Physical Broadcast Channel) (the number of SSB blocks), etc., the reception quality of which can be simultaneously monitored by the user equipment (UE, from the English. User Equipment) (non-patent literature No. 1).

Specifically, it is specified that the UE should monitor at least 24 SSBs on a single carrier serving cell with a different SSB index and/or Physical Cell ID (PCI) using a predefined band (intra-frequency) in FR2 (Section 9.2.3.2 of TS 38.133).

The SSB tracking performed by the UE when using the intraband in FR2 is set on the assumption that the transmission side (radio base station) is co-located.

For this reason, in the case of carrier aggregation (CA, from the English Carrier Aggregation) using the intra-frequency band in FR2, since it is assumed that the reception quality measured for each component carrier (CC, from the English Component Carrier), in particular, the value the power of the received reference signal (RSRP, from the English Reference Signal Received Power) does not differ significantly, it is enough that 24 SSB blocks on any secondary CC (SCC, from the English Secondary CC) are tracked if there is no primary CC ( RCC, from the English Primary CC), or primary secondary CC (PSCC, from the English Primary Secondary CC), or if neither the RCC nor the PSCC exists in the corresponding band in FR2, in terms of obtaining the proper RSRP.

List of Cited Materials

Non-Patent Literature

Non-Patent Literature #1: TS 38.133 V15.4.0, 3rd Generation Partnership Project (3GPP); Radio access network technical specification group; NR; Requirements for Radio Resource Management Support (Version 15), 3GPP, December 2018.

Disclosure of the essence of the invention

However, CA with intraband in FR2 has the following problems. Specifically, when neither a PCC nor a PSCC is contained in an intra-band in FR2, and only a plurality of SCCs are allocated, the UE cannot decide which of the SCCs to select among the plurality of SCCs for tracking SSBs.

In the case where the UE selects an arbitrary SCC, the network may not be able to obtain a proper RSRP based on which the reception quality of the entire CA can be judged.

Thus, the present invention has been designed with such a situation in mind, and it is an object of the present invention to provide a user equipment that can measure the proper reception quality of carrier aggregation with an intra-frequency band at a predetermined frequency band (FR) at any time.

According to one aspect, the present invention provides a user equipment (UE 200), wherein the user equipment carries out carrier aggregation with a plurality of component carriers (CC 30) allocated in a predefined band (intra-frequency band) in a predefined frequency band (FR2) and comprises a control unit (control unit 230) that selects, in the case of allocating only a plurality of secondary component carriers (SCCs) in a predetermined band, a secondary component carrier which is a target of reception quality measurement among the plurality of secondary component carriers; and a transmission unit (transmission unit 210) that transmits the measurement result of the reception quality.

According to one aspect, the present invention provides a user equipment (UE 200) that is configured to perform carrier aggregation with a plurality of component carriers allocated in a predetermined band in a predetermined frequency range, and includes a receiving unit (receiving unit 220) configured with the possibility, in the case of allocating only a plurality of secondary component carriers in a predetermined band, receiving configuration information specifying a secondary component carrier to be the target of reception quality measurement among the plurality of secondary component carriers; and a transmission unit (transmission unit 210) configured to transmit a reception quality measurement result based on the configuration information.

Brief description of the drawings

In FIG. 1 is a diagram illustrating the general schematic configuration of the radio communication system 10.

In FIG. 2 is a diagram illustrating the functional block components of a user equipment (UE) 200.

In FIG. 3 is a diagram illustrating one example of component carrier (CC) allocation for a predetermined band.

In FIG. 4 is a diagram illustrating one example configuration of Sync Signal (SS)/Physical Broadcast Channel (PBCH) blocks (or SSB blocks) transmitted from gNB 100 (or another gNB).

In FIG. 5 is a diagram illustrating examples of component carrier (CC) allocation in carrier aggregation (CA) using frequency band 1 (FR1) and frequency band 2 (FR2).

In FIG. 6 is a diagram illustrating a flowchart of SCC selection performed by UE 200.

In FIG. 7 shows a diagram illustrating one example of the sequence of transmission and reception of messages at the level of radio resource control (RRC, from the English. Radio Resource Control).

In FIG. 8 is a diagram illustrating one example of a UE 200 hardware configuration.

Implementation of the invention

Further, with reference to the accompanying drawings, various embodiments are disclosed. It should be noted that the same functions or configurations are designated by the same or similar reference numbers, and their description is omitted where appropriate.

(1) General schematic configuration of a radio communication system

In FIG. 1 is a diagram illustrating a general schematic configuration of a radio communication system 10 according to the present embodiment. The radio communication system 10 is a radio communication system according to 5G NR ("New Radio") technology and includes a new generation radio access network (hereinafter referred to as NG-RAN 20 (Next Generation-Radio Access Network)) and a user equipment 200 (hereinafter referred to as UE 200).

NG-RAN 20 includes a radio base station 100 (hereinafter referred to as gNB 100). It should be noted that the specific configuration of the radio communication system 10, namely the number of gNBs and the number of UEs, is not limited to the example illustrated in FIG. 1.

NG-RAN 20 actually contains a plurality of NG-RAN nodes, in particular gNB (or ng-eNB) nodes, and is connected to a core network (5GC) (not shown) in accordance with 5G. It should be noted that NG-RAN 20 and 5GC may simply be referred to as a network.

The gNB 100 is a radio base station according to 5G, and performs radio communication with UE 200 according to 5G. The gNB 100 and the UE 200 can support massive multiple input/multiple output (MIMO) in which a sharp beam is formed by controlling the radio signal transmitted from multiple antenna elements, carrier aggregation (CA) , which uses multiple component carriers (CC), dual connection (DC, from the English. Dual Connectivity), in which component carriers are simultaneously transmitted between multiple NG-RAN nodes and UEs, etc.

In the radio communication system 10, a plurality of frequency bands (FRs) are defined. In particular, FR1 and FR2 are set. In this embodiment, FR1 and FR2 are as follows.

- Frequency band 1 (FR1): 450 to 6000 MHz

- Frequency band 2 (FR2): 24250 to 52600 MHz

The maximum channel bandwidth per CC in FR1 is 100 MHz (using a subcarrier spacing of 30 to 60 kHz), and the maximum channel bandwidth per CC in FR2 is 400 MHz (using a subcarrier spacing of 120 kHz).

The UE 200 performs the CA with a plurality of CCs 30 (not shown in FIG. 1; see FIG. 3) allocated in a certain band (preset band) in FR1 and FR2 (preset frequency band).

(2) Components of functional blocks of a radio communication system

Next, the components of the functional blocks of the radio communication system 10 are disclosed. In particular, the components of the functional blocks of UE 200 are disclosed.

In FIG. 2 is a diagram illustrating the functional block components of the UE 200. As shown in FIG. 2, UE 200 includes a transmitter 210, a receiver 220, and a control 230.

The transmission unit 210 transmits an uplink signal (UL signal) in accordance with NR. In addition, the receiving unit 220 receives a downlink signal (DL signal) according to NR.

The control unit 230 controls the UL signal transmitted by the transmitter unit 20 and the DL signal received by the receiver unit 220.

Specifically, transmitting unit 210 transmits a UL signal configured with multiple CCs for gNB 100, and receiving unit 220 receives a DL signal configured with multiple CCs from gNB 100. That is, UE 200 performs carrier aggregation (CA) , in which broadcast communication is implemented using a plurality of CCs simultaneously.

In FIG. 3 shows an example of component carrier (CC) allocation for a predetermined band. In the selection example illustrated in FIG. 3, a plurality of bands (frequency bands) are specified, in particular band A and band B.

In addition, in the allocation example, two CCs 30 are adjacent to each other in the same band (A band) on the frequency axis.

The control unit 230 controls the receiver unit 220 to monitor synchronization signal (SS)/physical broadcast channel (PBCH) blocks (or SSB blocks) transmitted from gNB 100 and another gNB (cell).

In FIG. 4 shows an example configuration of SSBs transmitted from gNB 100 (or another gNB). As shown in FIG. 4, SSB 40 is transmitted from a cell (cell A) formed by gNB 100 (or another gNB) at a predetermined transmission interval (5, 10, 20, 40, 80, or 160 ms). That is, the SSB is transmitted at a predetermined transmission interval for each cell or CC.

The control unit 230 monitors a predetermined number of SSBs 40 transmitted at a predetermined interval as described above and measures the reception quality of the SS 30.

Table 1 indicates the number of cells and SSB units (number of beams) with different cell IDs (PCIs) that can be simultaneously measured (tracked) by the UE 200.

As indicated in Table 1, in the case of the intra-band in FR2, the number of SSBs is given by two diagrams. This is due to the following reason.

First, according to the 3GPP technology standard Release 15, it is difficult to simultaneously track multiple SSBs with different beam directions because the UE 200 can perform beamforming for reception in only one direction.

It should be noted that beamforming is a multi-antenna beamforming technique by controlling the amplitude and phase of the antennas to increase/decrease the antenna gain in a particular direction.

Secondly, the SSB tracking performed by the UE 200 in the case of using the intraband in FR2 is set based on the assumption that the transmission side (gNB) is at the same location.

Thus, in the case of a CA using intraband in FR2, since it is assumed that the value of the received reference signal power (RSRP) measured for each CC does not differ significantly, it is sufficient that 24 SSBs are tracked on any secondary CC (SCC) in the case where neither a Primary CC (PCC) nor a Primary Secondary CC (PSCC) exists, or when neither a PCC nor a PSCC exists in the corresponding band in FR2, in terms of obtaining a proper RSRP.

However, it is indicated that at least two SSBs can be measured for the quality of the received reference signal (RSRQ) even in the case of SSBs corresponding to other CCs, for the purpose of so-called offload.

In FIG. 5 shows examples of CA component carrier (CC) allocation using FR1 and FR2.

As shown in FIG. 5, PCC, PSCC and SCC (Secondary Component Carrier) are allocated to FR1 and FR2. It should be noted that PCC can also be allocated to FR2, so that CA is carried out using only FR2. It should also be noted that the operation of the UE 200 in accordance with the assignment example illustrated in FIG. 5 will be further disclosed below.

In a case where only a plurality of SCCs are allocated in a predetermined band, specifically an intra-band in FR2, the control unit 230 selects an SCC which is the target of reception quality measurement among the plurality of SCCs. In particular, the control unit 230 selects the SCC which is the target of the RSRP measurement.

The control unit 230 monitors the SSB transmitted with the selected SCC and measures the RSRP.

The transmitting unit 210 transmits the RSRP measurement result. In particular, the transmitting unit 210 transmits the measured RSRP value (or the order of the measured value) to the gNB 100.

In addition, in the case where there are a plurality of SCCs that are RSRP measurement targets, the control unit 230 may select one of the SCCs that are measurement targets.

In particular, in the case where there are multiple SCCs in the intraband in FR2 that are the targets of the RSRP measurement, the control unit 230 may arbitrarily select one of the SCCs. In other words, the criterion based on which the UE 200 selects any SCC may not be specifically specified, and may be left until implementation.

In addition, the receiving unit 220 may receive configuration information specifying an SCC to be a reception quality measurement target, in particular, an RSRP measurement target.

The configuration information specifies an SCC to be a reception quality measurement target among a plurality of SCCs in the case where only a plurality of SCCs are allocated to an intra-band (preset band) in FR2. Examples of configuration information include "MeasConfig", that is, the information element specified in 3GPPTS 38.331 may be used.

The control unit 230 monitors the SSB corresponding to the SCC selected based on the configuration information and measures the RSRP. In addition, the transmitting unit 210 transmits the result of the RSRP measurement based on the configuration information to the gNB 100.

(3) Operation of the radio communication system

Next, the operation of the radio communication system 10 is disclosed. In particular, a secondary component carrier (SCC) selection operation is disclosed, which is to be the target of the reception quality measurement performed by the UE 200.

(3.1) Component carrier allocation examples

As disclosed above, in FIG. 5 shows examples of CA allocation of component carriers (CCs) with intra-band in FR1 and intra-band in FR2. In particular, in FIG. 5 shows three selection examples.

In allocation example #1, a PCC is allocated to FR1, and a PSCC and a plurality of SCCs are allocated to FR2.

In allocation example #2, a PCC is allocated to FR1 and a plurality of SCCs are allocated to FR2. That is, no PSCC is allocated for FR2. In addition, in selection example #2, there is an SCC (SCC w/RSRP in FIG. 5) which is the target of the RSRP measurement. It should be noted that in selection example #2, there are also SCCs (SCC w/o RSRP in FIG. 5) that are not the targets of the RSRP measurement.

In allocation example #3, a PCC is allocated to FR1, and a plurality of SCCs are allocated to FR2, as in allocation example #2. In Extraction Example #3, there are multiple (two) SCCs (SCC w/RSRP in FIG. 5) that are the targets of the RSRP measurement.

Hereinafter, details of operation are disclosed in selecting a secondary component carrier (SCC) to be the target of measuring the reception quality performed by the UE 200 according to the CC allocation state for at least one of the FR1 or FR2 component carrier (CC), as in examples No. 1 - No. 3 of the selection.

(3.2) SCC selection sequence chart

In FIG. 6 shows a flowchart of SCC selection performed by UE 200. As shown in FIG. 6, UE 200 determines whether or not a PCC is allocated to FR2 (S10).

In the case of a PCC assignment for FR2, UE 200 tracks the SS/PBCH block (or SSB block) on the PCC, that is, the SS/PBCH block (or SSB block) corresponding to the PCC (S20).

Specifically, UE 200 monitors 24 SSBs according to the specification for the intraband in FR2 (see Table 1) (the same applies to the description below). As discussed above, in the case of a CA using intraband in FR2, it is assumed that the transmit side (gNB node) is in the same location, and therefore it is sufficient to track 24 SSBs on the selected CC and measure RSRP.

In case no PCC is allocated for FR2, UE 200 determines whether or not a PSCC is allocated for FR2 (S30).

In the case of PSCC allocation for FR2, UE 200 monitors 24 SSBs per PSCC (S40). Such a release state corresponds to the release example No. 1 in FIG. five.

In the case where no PSCC is allocated to FR2, the UE 200 determines whether or not an SCC is allocated to the FR2 that is the target of the RSRP measurement (S50).

In the case of allocating the SCC that is the target of the RSRP measurement to FR2, the UE 200 determines whether or not the number of SCCs, that is, the number of SCCs that are the targets of the RSRP measurement, is multiple (S60).

In the case where the number of SCCs that are the targets of the RSRP measurement is only 1, the UE 200 tracks 24 SSBs per SCC, that is, 24 SSBs corresponding to SCCs (S70). Such a release state corresponds to the release example No. 2 in FIG. five.

In the case where the number of SCCs that are the targets of the RSRP measurement is multiple, the UE 200 selects an arbitrary SCC among the plurality of SCCs (S80). Such a release state corresponds to the release example No. 3 in FIG. five.

In addition, UE 200 monitors 24 SSBs on the selected SCC (S90).

UE 200 monitors the selected SSB and measures RSRP (S100).

It should be noted that in the selection flow chart of FIG. 5, the determination is made in the following order: PCC, PSCC, and SCC, but this order can be changed depending on the situation.

(3.3) Reporting configuration information from the network

In FIG. 7 shows an example sequence for transmitting and receiving messages in the radio resource control layer (RRC layer).

As shown in FIG. 7, the network (specifically, NG-RAN 20) transmits the RRC reconfiguration to the UE 200 (S110).

The RRC reconfiguration includes "MeasConfig", which is an information element indicating the configuration content related to the measurement at the UE 200. In particular, in the present embodiment, "MeasConfig" contains configuration information specifying the SCC to be the target of the measurement. RSRP.

The UE 200 receiving the RRC reconfiguration may select the SCC to be the target of the RSRP measurement based on the configuration information. Here, the SCC selection flow chart illustrated in FIG. 6 does not apply.

The UE 200 performs processing based on the RRC reconfiguration content, and returns an RRC reconfiguration completed message to the network (S120).

(4) Action/outcome

According to the embodiment disclosed above, the following results can be obtained. Specifically, in the case of allocating only a plurality of SCCs to an intraband in FR2, the UE 200 selects an SCC that is the target of the RSRP measurement among the plurality of SCCs.

The SCC, which is the target of the RSRP measurement, is ideally suited as a CC for assessing the reception quality of the entire AS. That is, UE 200 may select a component carrier that is a proper tracking target at any time in the intraband in FR2 (preset frequency band).

Thus, UE 200 can at any time measure the proper reception quality in frequency aggregation with the intra-band in FR2. As a result, it is possible to prevent the UE 200 from sending a report with a reception quality measurement result that is undesirable for the network, which contributes to a more correct operation of the entire radio communication system 10.

In the present embodiment, UE 200 selects the SCC that is the target of the RSRP measurement. Thus, the network can certainly obtain enough information to evaluate the reception quality of the entire CA with the intraband in FR2.

In the present embodiment, if there are multiple SCCs that are reception quality measurement targets (RSRP), the UE 200 selects one of the SCCs that are reception quality measurement targets. Thus, even in the case of a plurality of SCCs, the reception quality can certainly be measured.

In the exemplary embodiment, UE 200 may receive configuration information specifying an SCC to become a reception quality measurement target (RSRP). Thus, the SCC to be the target of the reception quality measurement can be set under the direction of the network. This allows flexible selection of the SCC to be the measurement target, taking into account the state of the radio communication system 10, etc.

(5) Other embodiments

Although the contents of the present invention have been disclosed above with reference to the present embodiment, the present invention is not limited to this description, and it is obvious to a person skilled in the art that various modifications and improvements are possible.

For example, in the embodiment disclosed above, RSRP is measured as reception quality, but reception quality may include, for example, RSRQ and Signal to Interference plus Noise Ratio (SINR) in addition to RSRP.

In addition, the block diagram (FIG. 2) used to describe various embodiments illustrates blocks in functional units. These functional blocks (structural components) are implemented by the desired combination of at least one of hardware and software. The implementation method of each function block is not limited to a specific example. That is, each functional block can be implemented by one physically or logically connected device. Alternatively, two or more physically or logically independent devices may be directly or indirectly (eg, via wired or wireless communication) connected to each other, with each functional block being implemented by these multiple devices. The functional blocks may be implemented by combining software with a single device or a plurality of devices mentioned above.

Functions include evaluating, deciding, determining, calculating, calculating, processing, receiving, examining, searching, confirming, receiving, transmitting, inferring, accessing, allowing, selecting, selecting, establishing, comparing, assuming, waiting, considering, broadcast, message, data exchange, forwarding, configuration, reconfiguration, allocation (display), assignment, etc. However, the functions are not limited to these examples. For example, a functional block (structural component) that provides transmission is referred to as a transmission block or transmitter. For any of the above functions, as disclosed above, the implementation method is not limited to a specific method.

In addition, the UE 200 described above may function as a computer that performs processing in accordance with the radio communication method of the present invention. In FIG. 8 is a diagram illustrating one example of a hardware configuration of UE 200. As shown in FIG. 8, UE 200 may be implemented as a computing device including a processor 1001, a memory 1002, a storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and so on.

In addition, in the following description, the term "device" can be replaced by a circuit, a device, a block, etc. The hardware configuration of the device may be configured to include one or more of the devices illustrated in the drawing, or may be configured without some of these devices.

The functional blocks (see FIG. 2) of UE 200 are implemented by any of the computing device hardware elements or a desired combination of hardware elements.

In addition, the processor 1001 operates by downloading predefined software (program) to the hardware, for example, the processor 1001 and the memory 1002, controls communication through the communication device 1004, and controls the reading and/or writing of data to the memory 1002 or the storage device 1003, thereby enabling the implementation of various functions of the UE 200.

The processor 1001 employs, for example, an operating system to control the entire computer. The processor 1001 may be formed by a central processing unit (CPU, from the English Central Processing Unit) containing an interface with a peripheral device, a control device, a computing device, a register, etc.

In addition, the processor 1001 reads a program (program code), a program module, data, and so on. from the storage device 1003 and/or the communication device 1004 to the memory 1002, and performs various types of processing according to the data. With respect to the program, a program is used that causes the computer to perform at least some of the operations disclosed in the above embodiments. Alternatively, the various types of processing disclosed above may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented using one or more chips. Alternatively, the program may be transmitted from the network via a telecommunication link.

The memory 1002 is a computer-readable storage medium, and may be formed, for example, by at least one of the following: read-only memory (ROM), erasable programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), random access memory (RAM) ) etc. The memory 1002 may be referred to as a register, cache, main memory (main storage), etc., for example. Memory 1002 may store program(s), program modules, etc., which may execute the method according to the present embodiment.

The drive 1003 is a computer readable storage medium. Examples of the drive 100 include an optical disc such as a compact disc ROM (CD-ROM), a hard disk drive, a floppy disk, a magneto-optical disc (such as a CD, a digital versatile disc, and a Blu-Ray disc (registered trademark ), smart card, flash memory device (e.g., card, drive, and flash drive), floppy disk (registered trademark), magnetic stripe, etc. The drive 1003 may be referred to as an auxiliary storage device. , a database, including a memory 1002 and/or a storage device 1003, a server, or other suitable storage medium.

The communication device 1004 is a hardware (transmitting/receiving device) capable of communicating between computers via a wired and/or wireless network. The communication device 1004 is also referred to as a network device, network controller, network card, communication module, etc., for example.

The communication device 1004 may include an RF switch, a duplexer, a filter, a frequency synthesizer, and so on. to implement at least one of the following types of communication, for example, duplex communication with frequency division (FDD, from the English. Frequency Division Duplex) and duplex communication with time division (TDD, from the English. Time Division Duplex).

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that receives input from outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that sends output data to the outside. It should be noted that the input device 1005 and the output device 1006 may be an integrated component (eg, a touch panel).

In addition, the respective devices, such as the processor 1001 and the memory 1002, are connected to each other via a bus 1007 to transmit information. Bus 1007 may be implemented using a single bus, or may be formed by different buses that differ between devices.

In addition, the device may be configured such that it contains hardware such as a microprocessor, a digital signal processor (DSP, from the English Digital Signal Processor), an application specific integrated circuit (ASIC, from the English Application Specific Integrated Circuit), programmable a logical device (PLD, from the English Programmable Logic Device), and a user-programmable gate array (FPGA, from the English Field Programmable Gate Array), etc. Some or all of these functional blocks may be implemented in hardware. For example, processor 1001 may be implemented with at least one of these hardware components.

The communication of the information is in no way limited to the aspect/embodiment disclosed herein, and may be carried out using other methods. For example, the information message can be implemented in the present invention by physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI), higher layer signaling (for example, radio resource control (RRC) signaling, medium access control (MAC) signaling), broadcast information (for example, a master information block (MIB), and a system information block (SIB RRC signaling may be referred to as an RRC message, for example, or may be an RRC connection setup message, an RRC connection reconfiguration message, and so on.

Each of the aspects/embodiments disclosed above can be applied to at least one of the following schemes: LTE scheme, LTE-Advanced (LTE-A) scheme, SUPER 3G scheme, IMT-Advanced scheme, 4th generation mobile communication system ( 4G), 5th generation (5G) mobile communication systems, Future Radio Access (FRA), NR (“New Radio”) technology, W-CDMA (registered trademark), Global System for Mobile Communications (GSM). System for Mobile communications) (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark) ), IEEE 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), a system that uses another suitable system, and a next generation system extended based on these systems. In addition, multiple systems may be combined (eg, a combination of at least one of LTE and LTE-A with 5G).

Provided there is no conflict, the order of processing procedures, sequences, flowcharts, etc. each of the aspects/embodiments disclosed above may be modified. For example, the various steps and sequence of steps of the methods disclosed above are exemplary and are not limited to the specific order suggested.

In this description, a particular operation performed by a base station is in some cases performed by the upper node of that base station. Obviously, in a network containing one or a plurality of network nodes having a base station, various operations performed to communicate with the terminal may be performed by at least one of the base station and other network nodes other than the base station (for example, may Mobility Management Entity (MME), serving gateways (S-GW, Serving-Gateways), etc., can be considered, without being limited to these examples). The above disclosed an example in which there is one network node other than the base station; however, a combination of many other network nodes can be used (eg MME and S-GW) -

Information and signals (information, etc.) can be issued from a higher layer (or lower layer) to a lower layer (or higher layer). They can be input and output via a plurality of network nodes.

The input/output information may be stored in a dedicated location (eg memory) or may be tracked using a control table. The input/output information can be overwritten, updated or added. Information may be deleted after withdrawal. The entered information can be transferred to another device.

The determination can be made by some value (0 or 1) expressed by a single bit, or based on a boolean value (boolean value: true or false) or by comparing numerical values (eg, comparing with a predefined value).

Each aspect/embodiment disclosed herein may be used alone or in combination, or may be switched according to the embodiment. Moreover, the message of the predefined information (eg, the message of what "is X") is not limited to the message in an explicit form, and may be sent implicitly (eg, without the message of this predefined information).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or any other name, is to be construed broadly to mean an instruction, set of instructions, code, code segment, program code, program, subroutine, program module, application, program application, program package, routine, subprogram, object, executable, thread of execution, procedure, function, etc.

In addition, software, instructions, information, etc. can be transmitted and received via the transmission medium. When, for example, the software is transferred from a website, server, or other remote source using at least one of a wired technology (for example, coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL) and etc.) and wireless technology (eg, infrared, microwaves, etc.), at least one of these wired and wireless technologies is included in the definition of the transmission medium.

The information, signals, etc. mentioned above may be represented using any of numerous different technologies. For example, data, instruction, command, information, signal, bit, symbol, chip, etc., mentioned above in the text of the entire description, can be expressed in terms of voltage, current, electromagnetic wave, magnetic field or magnetic particle, optical field or photons, or a desired combination of them.

It should be noted that terms disclosed in this specification and terms necessary for understanding the present invention may be replaced by terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signal information). In addition, the signal may be a message. Moreover, a component carrier (CC) may be referred to as carrier, cell, frequency carrier, and so on.

The terms "system" and "network" as used in this specification may be used interchangeably.

In addition, the information, parameter, etc. disclosed in this specification may be expressed with an absolute value, may be expressed with a relative value relative to a predetermined value, or may be expressed with other relevant information. For example, a radio resource may be designated by an index.

The name used to refer to the above parameter is in no way limiting. In addition, formulas, etc., which are used for these parameters may differ from those explicitly disclosed in this description. Since the various channels (eg, PUCCH, PDCCH, etc.) and information elements may be designated by any suitable name, the various names associated with these various channels and information elements are in no way limiting.

In this specification, it is assumed that the terms "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point ”, “transmitting point”, “receiving point”, “transmitting/receiving point”, “cell”, “sector”, “cell group”, “carrier”, “component carrier”, etc. can be used as synonyms. A base station may also be referred to by terms such as macro cell, small cell, femto cell, or pico cell.

A base station may contain one or more (eg, three) cells (also referred to as sectors). In a configuration in which a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of small areas. In each such small area, a communication service can be provided by a base station subsystem (eg, a small indoor base station (PRH: Remote Radio Node)).

The term "cell" or "sector" refers to a part of the coverage area or the entire coverage area of a base station and/or base station subsystem that provides a communication service in that coverage.

In this description, the terms "mobile station (MS)", "user terminal", "user equipment (UE, from the English. User Equipment) *," terminal "etc. can be used as synonyms.

A mobile station may also be referred to by those skilled in the art in some cases as a user terminal, mobile unit, subscriber station, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile user terminal, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or other suitable term.

At least one of the base station and the mobile station may be referred to as a transmitter, a receiver, a communication device, and so on. It should be noted that at least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, and so on. A movable object can be a vehicle (for example, a car, an aircraft, etc.), a movable object that moves without a crew (for example, an unmanned aerial vehicle, a self-driving car, etc.) or a robot (with a manual with or without an operator). At least one of the base station and the mobile station may be a device that also need not move during a communication operation. For example, at least one of the base station and the mobile station may be a loT (Internet of Things) device such as a sensor.

In addition, the base station in this description can be interpreted as a mobile station (user terminal; hereinafter, the same applies). For example, each of the aspects/embodiments of the present invention can be applied to a configuration in which communication between a base station and a mobile station is replaced by communication between multiple mobile stations (which may be referred to, for example, as D2D (Device-to-Device); -device), V2X (Vehicle-to-Everything; vehicle communication with "everything"), etc.). In this case, the mobile station may have the function of a base station. Words such as "uplink" and "downlink" can be replaced by a word that corresponds to the connection between the terminals (eg, "lateral"). For example, terms such as uplink, downlink, etc. can be interpreted as a lateral channel.

By analogy, the mobile station in the present description can be interpreted as a base station. In this case, the base station may have the function of a mobile station.

The words "connected", "associated", or any variation thereof, may refer to any direct or indirect connection or connection between two or more elements. In addition, one or more intermediate elements can be provided between two elements "connected" or "connected" to each other. A relationship or connection between elements can be physical, logical, or a combination of such connections. For example, "connection" can be interpreted as "access". As used herein, two elements may be "connected" or "connected" to each other using one or more cables, wires, printed electrical connections, etc., and in some non-limiting and non-limiting examples, using electromagnetic energy having wavelengths in the radio frequency range, microwave range or optical (both visible and invisible) region, etc.

The reference signal may be abbreviated to "RS" (Reference Signal) and may be referred to as a pilot signal, depending on the applicable standards.

The expression "based on" as used in this specification does not mean "based only on", unless otherwise indicated. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to an element for which terms such as "first", "second", etc. are used in the present specification does not generally limit the number or order of these elements. These names are used in this specification for convenience only, as a way to distinguish between two or more elements. Thus, referring to the first and second elements does not mean that only two elements can be used, or that the first element must precede the second element in some way.

If words such as "includes", "including" and variations of these words are used in the present description, then these words should be understood as comprehensive, by analogy with the word "comprising". In addition, the word "or" used in the present description is not an exclusive "or".

For example, if in the present description the nouns are used in the singular, then the present description may cover the plural cases of these nouns.

In this description, the phrase that "A and B are different" may mean that "A and B are different from each other." It should be noted that this phrase may mean that "A and B are each different from C". Terms such as "separate", "connected", etc. can also be interpreted by analogy with the word "different".

Although the present invention has been described in detail above, it will be apparent to a person skilled in the art that the present invention is not limited to the embodiments disclosed herein. The present invention may be embodied in modified and altered aspects without departing from the spirit and scope of the present invention as defined by the appended claims. Accordingly, the foregoing description is for illustrative purposes only and should not be construed as limiting the present invention in any way.

POSITION NUMBERS

10 - Radio communication system

20-NG-RAN

30 - SS

40-SSB

100-gNB

200-UE

210 - Transmission unit

220 - Receiving block

230 - Control unit

1001 - Processor

1002 - Memory

1003 - Accumulator

1004 - Communication device

1005 - Input device

1006 - Output device

1007 - Tire.

Claims (16)

1. A terminal capable of performing carrier aggregation with a plurality of component carriers allocated in a band in a frequency band, the terminal comprising: a control unit configured, in the case of allocating only a plurality of secondary component carriers in said band, selecting a secondary component carrier which is a target of reception quality measurement among the plurality of secondary component carriers; and a transmitting unit configured to transmit the measurement result of the reception quality, wherein the control unit is configured to select a secondary component carrier, which is the target of measuring the power of the received reference signal. 2. The terminal according to claim 1, wherein the control unit is configured, in the case of a plurality of secondary component carriers that are reception quality measurement targets, to select one of the secondary component carriers that are reception quality measurement targets. 3. A radio communication method, comprising the steps of: carry out at the terminal carrier aggregation using a plurality of component carriers allocated in a band in a frequency band; in the case of allocating only a plurality of secondary component carriers in said band, selecting a secondary component carrier, which is the target of reception quality measurement, among the plurality of secondary component carriers; and transmit the measurement result of the reception quality, wherein, in the step of selecting the secondary component carrier, the secondary component carrier is selected which is the target of measuring the power of the received reference signal. 4. A radio communication system containing a terminal and a radio base station, comprising: a terminal configured to perform carrier aggregation with a plurality of component carriers allocated in a band in a frequency band, the terminal comprising: a control unit configured, in the case of allocating only a plurality of secondary component carriers in said band, selecting a secondary component carrier which is a target of reception quality measurement among the plurality of secondary component carriers; and a transmitting unit configured to transmit the measurement result of the reception quality, wherein the control unit is configured to select a secondary component carrier, which is the target of measuring the power of the received reference signal; a radio base station comprising a receiving unit configured to receive the measurement result.

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