WO2021074955A1 - Terminal - Google Patents

Abstract

A UE (200) receives reference-signal configuration information used in a neighbouring cell in a second frequency band different from a first frequency band assigned to mobile communications. The UE (200) measures a synchronisation signal block in said neighbouring cell on the basis of said configuration information.

Description

Terminal

The present invention relates to a terminal that executes wireless communication, and more particularly to a terminal that uses an unlicensed frequency band.

The 3rd Generation Partnership Project (3GPP) is a specification of Long Term Evolution (LTE), LTE-Advanced (hereinafter referred to as LTE including LTE-Advanced), and 5th generation mobile communication system for the purpose of further speeding up LTE. Specifications (also called 5G, New Radio (NR) or Next Generation (NG)) are also underway.

For example, in NR, as in LTE, New Radio-Unlicensed (NR-U), which expands the available frequency band by using the spectrum of the unlicensed frequency band, is being studied (Non-Patent Document 1). ).

In addition, regarding the initial access in NR-U, the candidate position (candidate SSB position) of SSB (SS / PBCH Block) composed of the synchronization signal (SS: Synchronization Signal) and the downlink physical broadcast channel (PBCH: Physical Broadcast CHannel). Is being studied (Non-Patent Document 2).

Specifically, it has been agreed that the number of candidate SSB positions will be 10 when the subcarrier interval (SCS) is 15 kHz and 20 when the subcarrier interval (SCS) is 30 kHz.

In addition, in order to reduce the number of candidate SSB positions targeted by the terminal in the initial access to the network of the terminal (User Equipment, UE), the DRS (Discovery Reference Signal) configuration is configured by system information (MIB: Master Information Block). It is proposed to notify.

Since the terminal can limit the number of candidate SSB positions to be measured based on the DRS configuration, efficient SSB measurement is possible. As a result, quick initial access and reduction of processing load can be achieved.

The above-mentioned request for reduction of candidate SSB position to be measured is the same for SSB measurement in peripheral cells in the unlicensed frequency band.

Therefore, the present invention has been made in view of such a situation, and an object of the present invention is to provide a terminal capable of efficiently performing SSB measurement in peripheral cells in NR-U using an unlicensed frequency band. ..

One aspect of the present disclosure is a receiver that receives configuration information of a reference signal (DRS) used in a peripheral cell in a second frequency band (unlicensed frequency band Fu) different from the first frequency band assigned for mobile communication. A terminal (UE200) including (control signal / reference signal processing unit 240) and a control unit (control unit 270) that executes measurement of a synchronization signal block (SSB) in the peripheral cells based on the configuration information. is there.

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing a frequency range used in the wireless communication system 10. FIG. 3 is a diagram showing a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10. FIG. 4 is a diagram showing a configuration example of a synchronization signal block (SSB). FIG. 5 is a functional block configuration diagram of the UE 200. FIG. 6A is a diagram (No. 1) showing a configuration example (2SSB / slot) of the DRS. FIG. 6B is a diagram (No. 2) showing a configuration example (2SSB / slot) of the DRS. FIG. 6C is a diagram (No. 3) showing a configuration example (2SSB / slot) of the DRS. FIG. 7 is a diagram showing another configuration example (1SSB / slot) of the DRS. FIG. 8 is a diagram showing an example of an overall schematic sequence relating to the measurement of peripheral cells in the unlicensed frequency band Fu. FIG. 9 is a diagram showing a configuration example of SSB-ToMeasure IE. FIG. 10 is a diagram showing another configuration example of SSB-ToMeasure IE. FIG. 11 is a diagram showing still another configuration example of SSB-ToMeasure IE. FIG. 12 is a diagram showing a configuration example of SSB-ToMeasure-Unlicensed IE. FIG. 13 is a diagram showing an example of the hardware configuration of the UE 200.

Hereinafter, embodiments will be described based on the drawings. The same functions and configurations are designated by the same or similar reference numerals, and the description thereof will be omitted as appropriate.

(1) Overall Schematic Configuration of Wireless Communication System FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system according to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN20, and a terminal 200 (hereinafter, UE200)).

NG-RAN20 includes a radio base station 100 (hereinafter, gNB100). The specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.

The NG-RAN20 actually includes multiple NG-RANNodes, specifically gNB (or ng-eNB), and is connected to a core network (5GC, not shown) according to 5G. In addition, NG-RAN20 and 5GC may be simply expressed as "network".

GNB100 is a wireless base station that complies with 5G, and executes wireless communication according to UE200 and 5G. The gNB100 and UE200 use Massive MIMO (Multiple-Input Multiple-Output) and multiple component carriers (CC) to generate more directional beam BM by controlling radio signals transmitted from multiple antenna elements. It can support carrier aggregation (CA) that is used in a bundle, and dual connectivity (DC) that communicates simultaneously between the UE and each of the two NG-RAN Nodes.

Wireless communication system 10 supports multiple frequency ranges (FR). FIG. 2 shows the frequency range used in the wireless communication system 10. Further, FIG. 3 shows a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10.

As shown in FIG. 2, the wireless communication system 10 corresponds to FR1 and FR2. The frequency bands of each FR are as follows.

・ FR1: 410 MHz to 7.125 GHz
・ FR2: 24.25 GHz to 52.6 GHz
FR1 uses 15, 30 or 60kHz Sub-Carrier Spacing (SCS) and uses a bandwidth (BW) of 5-100MHz. FR2 has a higher frequency than FR1, uses SCS of 60, or 120kHz (240kHz may be included), and uses a bandwidth (BW) of 50 to 400MHz.

SCS may be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.

Furthermore, the wireless communication system 10 may support a higher frequency band than the FR2 frequency band. For example, the wireless communication system 10 can support frequency bands beyond 52.6 GHz and up to 114.25 GHz. Here, such a high frequency band is referred to as "FR4" for convenience. FR4 belongs to the so-called EHF (extremely high frequency, also called millimeter wave). FR4 is a tentative name and may be called by another name.

Also, FR4 may be further classified. For example, FR4 may be divided into a frequency range of 70 GHz or less and a frequency range of 70 GHz or more. Alternatively, FR4 may be divided into more frequency ranges or frequencies other than 70 GHz.

Also, here, the frequency band between FR2 and FR41 is referred to as "FR3" for convenience. FR3 is a frequency band above 7.125 GHz and below 24.25 GHz.

In this embodiment, FR3 and FR4 are different from the frequency band including FR1 and FR2, and are referred to as different frequency bands.

Further, in the wireless communication system 10, in addition to the frequency band (first frequency band) assigned for the wireless communication system 10, an unlicensed frequency band Fu (second frequency band) different from the frequency band is also used. Specifically, in the wireless communication system 10, New Radio-Unlicensed (NR-U), which extends the available frequency band by using the spectrum of the unlicensed frequency band, can be executed.

The frequency band allocated for the wireless communication system 10 is a frequency band included in the frequency range of FR1 and FR2 described above, and based on the license allocation by the government.

Unlicensed frequency band Fu is a frequency band that does not require a license allocation by the government and can be used without being limited to a specific telecommunications carrier. For example, a frequency band for wireless LAN (WLAN) (2.4 GHz or 5 GHz band, etc.) can be mentioned.

In the unlicensed frequency band Fu, it is possible to install a radio station not limited to a specific telecommunications carrier, but it is not desirable that signals from nearby radio stations interfere with each other and significantly deteriorate communication performance.

Therefore, for example, in Japan, as a requirement for a wireless system using the unlicensed frequency band Fu (for example, 5 GHz band), gNB100 executes carrier sense before starting transmission, and the channel is used by another system in the vicinity. The Listen-Before-Talk (LBT) mechanism, which enables transmission within a predetermined time length, is applied only when it can be confirmed that the notification has not been performed. The carrier sense is a technique for confirming whether or not the frequency carrier is used for other communication before emitting a radio wave.

When the gNB100 executes carrier sense and can confirm that the channel is not used by another system in the vicinity, it can refer to a reference signal for wireless link monitoring, specifically, RLM-RS (Radiolink monitoring-Reference). Signal) is transmitted into the forming cell.

RLM-RS may include DRS (Discovery Reference Signal), SSB (SS / PBCH blocks: Synchronization Signal / Physical Broadcast Channel blocks) and CSI-RS (Channel State Information-RS). The DRS may also include a CSI-RS, RMSI-CORSET (Remaining minimum system information-control resource sets), or PDSCH (Physical Downlink Shared Channel) associated with the SSB.

RMSI-CORSET is a CORESET for Type0-PDCCH CSS (Common Search Space) set, and UE200 determines and determines several contiguous resource blocks (RBs) and symbols for RMSI-CORSET. PDCCH (Physical Downlink Control Channel), specifically, Type 0 PDCCH monitoring opportunity (MO) for system information block (SIB) decoding is set based on the RB and symbol.

In addition, the UE 200 has one or more PRACHs (SS / PBCH Block) associated with an SSB (SS / PBCH Block) composed of a synchronization signal (SS: Synchronization Signal) and a downlink physical broadcast channel (PBCH: Physical Broadcast CHannel). A transmission opportunity (called PRACH Occasion (RO)) for PhysicalRandomAccessChannel) is provided.

FIG. 4 shows a configuration example of a synchronization signal block (SSB). As shown in FIG. 4, the SSB is composed of a synchronization signal (SS: Synchronization Signal) and a downlink physical broadcast channel (PBCH: Physical Broadcast CHannel).

SSB is mainly transmitted periodically for UE200 to execute cell ID and reception timing detection at the start of communication. In 5G, SSB is also used to measure the reception quality of each cell.

SS is composed of a primary synchronization signal (PSS: Primary SS) and a secondary synchronization signal (SSS: Secondary SS).

PSS is a known signal that UE200 first attempts to detect in the cell search procedure. The SSS is a known signal transmitted to detect the physical cell ID in the cell search procedure.

After detecting SS / PBCH Block, PBCH is an index for identifying the symbol position of multiple SS / PBCH Blocks in the radio frame number (SFN: SystemFrameNumber) and half frame (5 milliseconds). The UE200 contains the information needed to establish frame synchronization with the NR cell formed by the gNB100.

The PBCH can also include system parameters required to receive system information (SIB). Further, the SSB also includes a reference signal for demodulation of the broadcast channel (DMRS for PBCH). DMRS for PBCH is a known signal transmitted to measure the radio channel state for PBCH demodulation.

(2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of UE200 will be described.

FIG. 5 is a functional block configuration diagram of the UE 200. As shown in FIG. 5, the UE 200 includes a radio signal transmission / reception unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, a coding / decoding unit 250, a data transmission / reception unit 260, and a control unit 270. ..

The wireless signal transmitter / receiver 210 transmits / receives a wireless signal according to NR. The radio signal transmitter / receiver 210 corresponds to Massive MIMO, a CA that bundles and uses a plurality of CCs, and a DC that simultaneously communicates between a UE and each of two NG-RAN Nodes.

The amplifier unit 220 is composed of PA (Power Amplifier) / LNA (Low Noise Amplifier) and the like. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. Further, the amplifier unit 220 amplifies the RF signal output from the radio signal transmission / reception unit 210.

The modulation / demodulation unit 230 executes data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB100 or other gNB).

The control signal / reference signal processing unit 240 executes processing related to various control signals transmitted / received by the UE 200 and processing related to various reference signals transmitted / received by the UE 200.

Specifically, the control signal / reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, control signals of the radio resource control layer (RRC). Further, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

The control signal / reference signal processing unit 240 executes processing using a reference signal (RS) such as Demodulation reference signal (DMRS) and Phase Tracking Reference Signal (PTRS).

DMRS is a known reference signal (pilot signal) between the base station and the terminal of each terminal for estimating the fading channel used for data demodulation. PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high frequency bands.

In addition to DMRS and PTRS, the reference signal also includes Channel State Information-Reference Signal (CSI-RS) and Sounding Reference Signal (SRS). In addition, the reference signal also includes RLM-RS, as described above.

In addition, the channel includes a control channel and a data channel. The control channel includes PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), PRACH (Physical Random Access Channel), PBCH (Physical Broadcast Channel) and the like.

The data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data means data transmitted over a data channel.

In the present embodiment, the control signal / reference signal processing unit 240 is unlicensed different from the frequency band (first frequency band) assigned for mobile communication, that is, the licensed frequency band (which may be called the license band). It receives the configuration information of the reference signal used in the peripheral cells in the frequency band Fu (second frequency band, which may also be called an unlicend band). In the present embodiment, the control signal / reference signal processing unit 240 constitutes a receiving unit.

Peripheral cells in the unlicensed frequency band Fu use the band included in the unlicensed frequency band Fu and are formed around (may be near or near) the cell (which may be called a serving cell) to which the UE200 is connected. It may mean a cell that has been used.

Further, the peripheral cell may be formed by a radio base station forming a serving cell, or may be formed by a radio base station different from the radio base station forming the serving cell.

The control signal / reference signal processing unit 240 receives the DRS configuration information used in the peripheral cell. Specifically, the DRS configuration information can be shown using SSB-ToMeasureIE specified in 3GPP TS38.331. SSB-ToMeasure is used for setting SSB for NR, not for NR-U, specifically for notifying the candidate position of SSB (candidate SSB position), but in this embodiment, the DRS in NR-U It is diverted to the notification of configuration information. SSB-ToMeasure is a bitmap format.

That is, the control signal / reference signal processing unit 240 uses a bitmap format indicating the candidate position of SSB in the cell in the frequency band (first frequency band) assigned for mobile communication, and is diverted to NR-U. Can receive configuration information.

Alternatively, a new IE may be specified to notify the DRS configuration information in NR-U, specifically, the candidate position of SSB (candidate SSB position). For example, SSB-ToMeasure-Unlicensed (name is tentative name) may be newly specified. SSB-ToMeasure-Unlicensed may be in bitmap format like SSB-ToMeasure, or may notify the unit size of DRS (may be simply expressed as size). That is, SSB-ToMeasure-Unlicensed may include the size of the DRS (reference signal).

That is, the control signal / reference signal processing unit 240 can receive the information element (IE) indicating the candidate position of SSB in the peripheral cell in the unlicensed frequency band Fu as the configuration information.

A specific configuration example of SSB-ToMeasure and SSB-ToMeasure-Unlicensed will be described later.

The coding / decoding unit 250 executes data division / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or other gNB).

Specifically, the coding / decoding unit 250 divides the data output from the data transmitting / receiving unit 260 into a predetermined size, and executes channel coding for the divided data. Further, the coding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

The data transmission / reception unit 260 executes transmission / reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmitter / receiver 260 is a PDU / SDU in a plurality of layers (such as a medium access control layer (MAC), a wireless link control layer (RLC), and a packet data convergence protocol layer (PDCP)). Assemble / disassemble. Further, the data transmission / reception unit 260 executes data error correction and retransmission control based on the hybrid ARQ (Hybrid automatic repeat request).

The control unit 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 executes the control related to the NR-U.

Specifically, the control unit 270 executes the measurement of SSB in the peripheral cells in the unlicensed frequency band Fu based on the DRS configuration information received by the control signal / reference signal processing unit 240. More specifically, the control unit 270 identifies a candidate position (candidate SSB position) of the SSB to be measured based on the configuration information, and executes measurement using the specified SSB.

(3) Operation of the wireless communication system Next, the operation of the wireless communication system 10 will be described. Specifically, UE200 describes the operation related to the measurement of peripheral cells in the unlicensed frequency band Fu. In particular, the operation of the UE 200 to identify the candidate position (candidate SSB position) of the SSB based on the DRS configuration information will be described.

(3.1) DRS configuration As the DRS (Discovery Reference Signal) in NR-U, a one-slot or half-slot configuration is assumed.

Here, regarding the configuration of DRS, the following multiple expression methods can be mentioned. However, the contents specified in each case are the same.

DRS unit size (ie 1 slot or half slot)
・ Number of SSBs in one slot (1 or 2)
・ Index of candidate position of SSB (candidate SSB position) (even number only or all)
6A to 6C show DRS configuration examples (2SSB / slot). FIG. 7 shows another configuration example (1SSB / slot) of the DRS.

As shown in FIGS. 6A to 6C, in the case of 2SSB / slot, two pairs of PDCCH and SSB are arranged in the slot (14 symbols). As shown in the upper and lower rows of FIG. 6A, the position (symbol position) relationship between the PDCCH and the SSB in the slot may be such that the two PDCCH and the SSB may be arranged consecutively, or for each pair of the PDCCH and the SSB. It may be arranged.

Further, as shown in FIGS. 6B and 6C, the DRS may include a PDSCH, and the PDCCH and the SSB may be separately arranged in different slots.

As shown in FIG. 7, in the case of 1SSB / slot, one pair of PDCCH and SSB is arranged in the slot. The PDCCH and SSB may be arranged separately in the time direction (that is, in the symbol direction) ((1) in the figure) or may be arranged adjacent to each other ((2)).

Also, as in the case of 2SSB / slot, PDSCH may be included in DRS, and PDCCH and SSB may be arranged separately in different slots.

Note that the DRS may be configured as follows. Specifically, the maximum size of the DRS send window is 5 ms. The maximum number (Y) of SSB candidate positions (candidate SSB positions) in the DRS transmission window is 10 for 15 kHz SCS and 20 for 30 kHz SCS.

Further, the DRS includes PDCCH and PDSCH as described above, but in the present embodiment, the DRS may be interpreted by replacing the RLM-RS including the DRS. Alternatively, a part of the signal or channel included in the RLM-RS may be included in the DRS.

As mentioned above, in order to reduce the number of candidate SSB positions targeted by the terminal (UE200) in the initial access, it has been proposed to notify the DRS configuration by system information (MIB: Master Information Block). ..

In this embodiment, the DRS configuration information is also notified by the network in order to reduce the number of candidate SSB positions targeted by the terminal for SSB measurement in peripheral cells in the unlicensed frequency band Fu.

(3.2) Operation Example Next, an operation in which the terminal (UE200) executes measurement of peripheral cells in the unlicensed frequency band Fu based on the above-mentioned DRS configuration information will be described.

(3.2.1) Overall Schematic Sequence FIG. 8 shows an example of an overall schematic sequence relating to the measurement of peripheral cells in the unlicensed frequency band Fu.

As shown in FIG. 8, the network notifies the system information block (SIB) to the UE 200 (S10). The type of SIB is not particularly limited, but here SIB1 is assumed.

SIB1 may contain information about DRS configuration information, specifically the SSB-ToMeasure or SSB-ToMeasure-Unlicensed field (name is tentative).

UE200 acquires the configuration information of DRS included in SIB (S20). Specifically, the UE 200 acquires SSB-ToMeasure or SSB-ToMeasure-Unlicensed included in the SIB. This will
The UE 200 can recognize the candidate position of SSB (candidate SSB position) in the unlicensed frequency band Fu, specifically, the candidate SSB position in the peripheral cells in the unlicensed frequency band Fu.

UE200 executes measurement of peripheral cells using SSB based on the candidate SSB position in the peripheral cell (S30). Specifically, the UE 200 performs a reception quality measurement of the peripheral cell.

The UE200 reports the result of the reception quality measurement of the peripheral cell to the network (S40). In addition, it should be noted.
The UE 200 may determine that communication (NR-U) via the peripheral cell of the unlicensed frequency band Fu is possible as a result of the reception quality measurement, and execute the initial access.

(3.2.2) Example of notification of DRS configuration information Next, an example of notification of DRS configuration information will be described. Specifically, the contents of SSB-ToMeasure and SSB-ToMeasure-Unlicensed included in the above-mentioned SIB will be described.

(3.2.2.1) Notification example First, an example of notification of DRS configuration information by SSB-ToMeasure will be described.

(3.2.2.1.1) Notification example 1-1
FIG. 9 shows a configuration example of SSB-ToMeasure IE. As shown in FIG. 9, the SSB-ToMeasure includes a field of shortBitmap, and the bitmap is diverted to notify the DRS configuration information.

For example, since shortBitmap has 4 bits, when the DRS configuration (DRS unit size) is 1 slot, it can be set as, for example, (1, 1, 1, 1) or (1, 1, 0, 0) (1, 1, 0, 0). "1" means with DRS). Since the DRS configuration is one slot or a half slot, it is possible to notify using only the first and second bits, and the information of the third and fourth bits is not always necessary.

On the other hand, when the DRS configuration (DRS unit size) is a half slot, it can be set as, for example, (1, 0, 1, 0) or (1, 0, 0, 0).

(3.2.2.2.1) Notification example 1-2
FIG. 10 shows another configuration example of SSB-ToMeasure IE. In the configuration example shown in FIG. 10, a bitmap field for NR-U is added (unlicensedSCS15KHZBitmap and unlicensedSCS30KHZBitmap).

In the example shown in FIG. 10, the number of candidate SSB positions described above (10 for 15 kHz SCS and 20 for 30 kHz SCS) is supported in order to notify the DRS configuration information. However, the number of bits does not necessarily have to support the number of the candidate SSB position.

(3.2.2.2.1) Notification example 1-3
FIG. 11 shows still another configuration example of SSB-ToMeasure IE. In the configuration example shown in FIG. 11, a field (unlicensedDRSSize) for notifying the DRS unit size is added.

As shown in FIG. 11, the unlicensedDRSSize indicates the DRS unit size (1 slot or half slot).

(3.2.2.2) Notification example 2
FIG. 12 shows a configuration example of SSB-ToMeasure-Unlicensed IE. As mentioned above, SSB-ToMeasure-Unlicensed is a new IE for NR-U. As shown in FIG. 12, SSB-ToMeasure-Unlicensed includes the fields of unlicensedSCS15KHZBitmap, unlicensedSCS30KHZBitmap and unlicensedDRSSize shown in FIGS. 10 and 11.

Note that SSB-ToMeasure-Unlicensed does not necessarily have to include all fields.

(4) Action / Effect According to the above-described embodiment, the following action / effect can be obtained. Specifically, the UE 200 is a frequency band assigned for mobile communication (first frequency band), that is, an unlicensed frequency band Fu (second frequency band, unlicensed band) different from the licensed frequency band. The DRS configuration information (SSB-ToMeasure or SSB-ToMeasure-Unlicensed) used in the peripheral cell in (good) can be received, and the SSB measurement in the peripheral cell can be executed based on the received configuration information.

Therefore, the UE 200 can reduce the number of candidate SSB positions to be measured based on the received configuration information. This allows the UE200 to perform efficient SSB measurements in peripheral cells as well as during initial access in NR-U using the unlicensed frequency band Fu.

In this embodiment, the UE 200 uses SSB-ToMeasure for NR and can receive DRS configuration information using a bitmap format indicating the candidate SSB position in the peripheral cell. In addition, the UE 200 can receive a new IE indicating the candidate SSB position in the peripheral cell, specifically, SSB-ToMeasure-Unlicensed as DRS configuration information.

Therefore, it is possible to easily and surely make the UE 200 recognize the DRS configuration information by using the existing IE or the new IE.

In the present embodiment, the DRS configuration information may include the size of the DRS, specifically, the DRS unit size. Therefore, the UE 200 can easily recognize the configuration of the DRS.

(5) Other Embodiments Although the contents of the present invention have been described above with reference to the examples, the present invention is not limited to these descriptions, and various modifications and improvements are possible. It is self-evident to the trader.

For example, the unlicensed frequency band may be called by a different name. For example, terms such as License-exempt or Licensed-Assisted Access (LAA) may be used.

Further, the block configuration diagram (FIG. 4) used in the description of the above-described embodiment shows a block for each functional unit. These functional blocks (components) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or two or more physically or logically separated devices can be directly or indirectly (eg, for example). , Wired, wireless, etc.) and may be realized using these plurality of devices. The functional block may be realized by combining the software with the one device or the plurality of devices.

Functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and assumption. There are broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but only these. I can't. For example, a functional block (constituent unit) for functioning transmission is called a transmitting unit or a transmitter. As described above, the method of realizing each of them is not particularly limited.

Further, the UE 200 described above may function as a computer that processes the wireless communication method of the present disclosure. FIG. 13 is a diagram showing an example of the hardware configuration of the UE 200. As shown in FIG. 13, the UE 200 may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the device may be configured to include one or more of each of the devices shown in the figure, or may be configured not to include some of the devices.

The functional block of UE200 (see FIG. 4) is realized by any hardware element of the computer device or a combination of the hardware elements.

In addition, each function in the UE 200 is such that the processor 1001 performs an operation by loading predetermined software (program) on the hardware such as the processor 1001 and the memory 1002, and controls the communication by the communication device 1004, or the memory 1002. And by controlling at least one of reading and writing of data in the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.

Further, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment is used. Further, the various processes described above may be executed by one processor 1001 or may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and is composed of at least one such as ReadOnlyMemory (ROM), ErasableProgrammableROM (EPROM), Electrically ErasableProgrammableROM (EEPROM), and RandomAccessMemory (RAM). May be done. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can execute the method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, for example, an optical disk such as Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, or a Blu-ray). It may consist of at least one (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. Storage 1003 may be referred to as auxiliary storage. The recording medium described above may be, for example, a database, server or other suitable medium containing at least one of the memory 1002 and the storage 1003.

The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, or the like.

The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.

The input device 1005 is an input device (for example, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

In addition, each device such as the processor 1001 and the memory 1002 is connected by the bus 1007 for communicating information. Bus 1007 may be configured using a single bus or may be configured using different buses for each device.

Further, the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA). The hardware may implement some or all of each functional block. For example, processor 1001 may be implemented using at least one of these hardware.

Further, the notification of information is not limited to the mode / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (for example, Downlink Control Information (DCI), Uplink Control Information (UCI), upper layer signaling (eg, RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block)). (MIB), System Information Block (SIB)), other signals or a combination thereof. RRC signaling may also be referred to as an RRC message, for example, RRC Connection Setup. ) Message, RRC Connection Reconfiguration message, etc. may be used.

Each aspect / embodiment described in the present disclosure includes LongTermEvolution (LTE), LTE-Advanced (LTE-A), SUPER3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system ( 5G), FutureRadioAccess (FRA), NewRadio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UltraMobile Broadband (UMB), IEEE802.11 (Wi-Fi (registered trademark)) , IEEE802.16 (WiMAX®), IEEE802.20, Ultra-WideBand (UWB), Bluetooth®, and other systems that utilize appropriate systems and at least one of the next generation systems extended based on them. It may be applied to one. In addition, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.

In some cases, the specific operation performed by the base station in the present disclosure may be performed by its upper node. In a network consisting of one or more network nodes having a base station, various operations performed for communication with the terminal are performed by the base station and other network nodes other than the base station (for example, MME or). It is clear that it can be done by at least one of (but not limited to, S-GW, etc.). Although the case where there is one network node other than the base station is illustrated above, it may be a combination of a plurality of other network nodes (for example, MME and S-GW).

Information and signals (information, etc.) can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

The input / output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input / output information can be overwritten, updated, or added. The output information may be deleted. The input information may be transmitted to another device.

The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparing numerical values (for example, a predetermined value). It may be done by comparison with the value).

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but is performed implicitly (for example, the notification of the predetermined information is not performed). May be good.

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, a website, where the software uses at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.). When transmitted from a server, or other remote source, at least one of these wired and wireless technologies is included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may be represented by a combination of.

Note that the terms explained in the present disclosure and the terms necessary 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 be a signal (signaling). Also, the signal may be a message. Further, the component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

The names used for the above parameters are not limited in any respect. Further, mathematical formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in any respect limited names. is not it.

In this disclosure, "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", "cell group" Terms such as "carrier" and "component carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.

The base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (Remote Radio)). Communication services can also be provided by Head: RRH).

The term "cell" or "sector" refers to a base station that provides communication services in this coverage, and part or all of the coverage area of at least one of the base station subsystems.

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably. ..

Mobile stations can be used by those skilled in the art as subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like. The moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be. It should be noted that at least one of the base station and the mobile station includes a device that does not necessarily move during communication operation. For example, at least one of a base station and a mobile station may be an Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read as a mobile station (user terminal, the same applies hereinafter). For example, communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the mobile station may have the functions of the base station. In addition, words such as "up" and "down" may be read as words corresponding to inter-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, and the like may be read as a side channel.

Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions of the mobile station.
The radio frame may be composed of one or more frames in the time domain. Each one or more frames in the time domain may be referred to as a subframe.
Subframes may further consist of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

The numerology may be a communication parameter that applies to at least one of the transmission and reception of a signal or channel. Numerology includes, for example, SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.

The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiple Access (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. Slots may be unit of time based on numerology.

The slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain. The mini-slot may also be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot. PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.

The wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.

For example, one subframe may be referred to as a transmission time interval (TTI), a plurality of consecutive subframes may be referred to as TTI, and one slot or one minislot may be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (eg, 1-13 symbols), or a period longer than 1ms. It may be. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

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

The TTI may be a transmission time unit such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, code word, etc. are actually mapped may be shorter than the TTI.

When one slot or one mini slot is called TTI, one or more TTIs (that is, one or more slots or one or more mini slots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be 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 slot, or the like. TTIs shorter than normal TTIs may also be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) may be read as less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

The resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. The number of subcarriers contained in RB may be the same regardless of numerology, and may be, for example, 12. The number of subcarriers contained in the RB may be determined based on numerology.

Further, the time domain of RB may include one or more symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.

One or more RBs include a physical resource block (Physical RB: PRB), a sub-carrier group (Sub-Carrier Group: SCG), a resource element group (Resource Element Group: REG), a PRB pair, an RB pair, and the like. May be called.

Further, the resource block may be composed of one or a plurality of resource elements (ResourceElement: RE). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (which may also be called partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. Good. Here, the common RB may be specified by the index of the RB with respect to the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWPs may be set in one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP. In addition, "cell", "carrier" and the like in this disclosure may be read as "BWP".

The above-mentioned structures such as wireless frames, subframes, slots, mini slots and symbols are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and other configurations can be changed in various ways.

The terms "connected", "coupled", or any variation thereof, mean any direct or indirect connection or connection between two or more elements, and each other. It can include the presence of one or more intermediate elements between two "connected" or "combined" elements. The connection or connection between the elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in the present disclosure, the two elements use at least one of one or more wires, cables and printed electrical connections, and, as some non-limiting and non-comprehensive examples, the radio frequency domain. , Electromagnetic energies with wavelengths in the microwave and light (both visible and invisible) regions, etc., can be considered to be "connected" or "coupled" to each other.

The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot (Pilot) depending on the applicable standard.

The phrase "based on" as used in this disclosure does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

The "means" in the configuration of each of the above devices may be replaced with a "part", a "circuit", a "device", or the like.

Any reference to elements using designations such as "first", "second" as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted there, or that the first element must somehow precede the second element.

When "include", "including" and variations thereof are used in the present disclosure, these terms are as comprehensive as the term "comprising". Is intended. Moreover, the term "or" used in the present disclosure is intended not to be an exclusive OR.

In the present disclosure, if articles are added by translation, for example, a, an and the in English, the disclosure may include that the nouns following these articles are plural.

The terms "determining" and "determining" used in this disclosure may include a wide variety of actions. "Judgment" and "decision" are, for example, judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry). (For example, searching in a table, database or another data structure), ascertaining may be regarded as "judgment" or "decision". Also, "judgment" and "decision" are receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (Accessing) (for example, accessing data in memory) may be regarded as "judgment" or "decision". In addition, "judgment" and "decision" mean that the things such as solving, selecting, choosing, establishing, and comparing are regarded as "judgment" and "decision". Can include. That is, "judgment" and "decision" may include considering some action as "judgment" and "decision". Further, "judgment (decision)" may be read as "assuming", "expecting", "considering" and the like.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". The term may mean that "A and B are different from C". Terms such as "separate" and "combined" may be interpreted in the same way as "different".

Although the present disclosure has been described in detail above, it is 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 may be implemented as an amendment or modification without departing from the purpose and scope of the present disclosure, which is determined by the description of the scope of claims. Therefore, the description of the present disclosure is for the purpose of exemplary explanation and does not have any limiting meaning to the present disclosure.

10 Radio communication system 20 NG-RAN
100 gNB
200 UE
210 Radio signal transmission / reception unit 220 Amplifier unit 230 Modulation / demodulation unit 240 Control signal / reference signal processing unit 250 Coding / decoding unit 260 Data transmission / reception unit 270 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims (4)

1. A receiver that receives configuration information of reference signals used in peripheral cells in a second frequency band different from the first frequency band assigned for mobile communication, and a receiver.
   A terminal including a control unit that executes measurement of a synchronization signal block in the peripheral cells based on the configuration information.
2. The terminal according to claim 1, wherein the receiving unit receives the configuration information using a bitmap format indicating a candidate position of a synchronization signal block in a cell in the first frequency band.
3. The terminal according to claim 1, wherein the receiving unit receives an information element indicating a candidate position of the synchronization signal block in the peripheral cell in the second frequency band as the configuration information.
4. The terminal according to claim 2 or 3, wherein the configuration information includes the size of the reference signal.
   
   
   

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