CN114097269A - Terminal device - Google Patents

Abstract

The terminal receives an inter-frequency synchronization IE indicating that a serving cell is synchronized with a neighboring cell using a frequency different from that of the serving cell. When the terminal receives the inter-frequency synchronization IE, the terminal performs measurement of the neighboring cell without acquiring an index of a Synchronization Signal Block (SSB) from the neighboring cell.

Description

Terminal device

Technical Field

The present invention relates to a terminal that performs measurement of a neighbor cell.

Background

The third Generation Partnership Project (3 GPP) has standardized Long Term Evolution (LTE), and has also standardized LTE-Advanced (hereinafter, LTE including LTE-Advanced) and fifth Generation mobile communication systems (also referred to as 5G, New Radio (NR) or Next Generation (NG) for the purpose of further speeding up LTE.

In release 15 of NR, the network can inform a terminal (User Equipment, UE) whether a serving cell is synchronized with a neighboring cell using the same frequency. Specifically, the notification is performed by "deriveSSB-indexffromcell" included in the Information Element (IE) of "MeasObjectNR" (non-patent document 1).

MeasObjectNR is information applied to intra/inter-frequency measurements of SSB (SS/PBCH Block) composed of a Synchronization Signal (SS) and a Physical Broadcast CHannel (PBCH). Also, the deriveSSB-indexfrmcell is information indicating whether the terminal can utilize the timing of the serving cell to derive an index of the SSB transmitted by the neighboring cell.

When the derivissb-indexfrmcell is included in the received MeasObjectNR, the terminal determines whether the frequency and subcarrier spacing (SCS) included in the serving cell setting information (ServingCellConfigCommon) are the same as those included in the MeasObjectNR.

When the frequency and the SCS are the same, the terminal assumes that the Frame boundary (Frame boundary) coincides with the System Frame Number (SFN) between the serving cell and the neighboring cell, and detection of the SSB index (SSB index) can be omitted in the quality measurement of the neighboring cell (non-patent document 2). This realizes efficient quality measurement of the neighboring cell.

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 38.331 V15.5.1,3rd Generation Partnership Project; technical Specification Group Radio Access Network; NR; radio Resource Control (RRC) protocol specification (Release 15), 3GPP, 4 months in 2019

Non-patent document 2: TS38.133 V15.5.0,3rd Generation Partnership Project; technical Specification Group Radio Access Network; NR; requirements for support of radio resource management (Release 15), 3GPP, 3 months 2019

Disclosure of Invention

The deriveSSB-indexfrmcell described above can notify whether or not the serving cell and the adjacent cell using the same frequency are synchronized, but in actual network operation, the serving cell and the adjacent cell using a different frequency may be synchronized.

In contrast, release 15 cannot notify whether or not the serving cell is synchronized with a neighboring cell using a frequency different from that of the serving cell.

Therefore, the present invention has been made in view of such a situation, and an object thereof is to provide a terminal in which the efficiency of quality measurement of a neighboring cell is further improved.

One embodiment of the present disclosure is a terminal (UE 200) including: a reception unit (radio reception unit 220) that receives synchronization information indicating synchronization between a serving cell and a neighboring cell that uses a different frequency from the serving cell; and a control unit (control unit 250) that, when the synchronization information is received, performs measurement of the adjacent cell without acquiring an index of a synchronization signal block from the adjacent cell.

Drawings

Fig. 1 is a schematic configuration diagram of the entire wireless communication system 10.

Fig. 2 is a diagram showing an example of the structure of a radio frame, a subframe, and a slot used in the wireless communication system 10 (NR).

Fig. 3 is a diagram showing an example of setting of an SSB (SS/PBCH Block: SS/PBCH Block) composed of a Synchronization Signal (SS) and a downlink Physical Broadcast CHannel (PBCH) used in the wireless communication system 10 (NR).

Fig. 4 is a functional block diagram of the UE 200.

Fig. 5 is a diagram showing communication timing related to quality measurement of a neighboring cell by the UE 200.

Fig. 6 is a diagram showing a flow of the quality measurement operation of the neighboring cell by the UE 200.

Fig. 7 is a diagram showing the processing content (1 thereof) of the processing of S130 of alternative operation example 1.

Fig. 8 is a diagram showing the processing content (2 thereof) of the processing of S130 of alternative operation example 1.

Fig. 9 is a diagram showing an example of the hardware configuration of the UE 200.

Detailed Description

Hereinafter, embodiments will be described with reference to the drawings. The same or similar reference numerals are used for the same functions and structures, and the description thereof is omitted as appropriate.

(1) General overall structure of wireless communication system

Fig. 1 is a schematic configuration diagram of the entire wireless communication system 10 according to the present embodiment. The Radio communication system 10 is a Radio communication system conforming to a New Radio interface (NR) of 5G, and includes a Next Generation Radio Access Network 20 (hereinafter, referred to as NG-RAN 20) and a User terminal 200 (hereinafter, referred to as UE 200).

The NG-RAN 20 includes radio base stations 100A and 100B (hereinafter referred to as gNB 100A, gNB 100B). In addition, 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. 1.

The NG-RAN 20 actually includes a plurality of NG-RAN nodes (NG-RAN nodes), specifically, gnbs (or NG-enbs), and is connected to a core network (5GC, not shown) compliant with 5G. In addition, the NG-RANs 20 and 5GC may be simply expressed as "networks".

The gnbs 100A and 100B are radio base stations compliant with 5G, and perform radio communication compliant with 5G with the UE 200. The gnbs 100A, 100B and the UE 200 can support massive MIMO that generates beams with higher directivity by controlling radio signals transmitted from a plurality of antenna elements, Carrier Aggregation (CA) that bundles a plurality of Component Carriers (CCs), Dual Connectivity (DC) that simultaneously communicates between the UE and a plurality of NG-RAN nodes, respectively, and the like.

Fig. 2 shows an example of the structure of a radio frame, a subframe, and a slot used in the wireless communication system 10 (NR). As shown in fig. 2, NR can support 30kHz wider than that of LTE, and further support 60, 120, and 240kHz (not shown) with reference to 15kHz which is the same subcarrier spacing (SCS)

In NR, a slot, a subframe, and a radio frame (which may be simply referred to as a frame) are configured by a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols. A slot is composed of 14 OFDM symbols regardless of subcarrier spacing, a subframe is defined as a 1ms interval, and a frame is defined as 10 subframes.

Fig. 3 shows an example of setting of an SSB (SS/PBCH Block) composed of a Synchronization Signal (SS) and a Physical Broadcast CHannel (PBCH) used in the wireless communication system 10 (NR). The SSB may also be referred to as a synchronization signal block.

As shown in fig. 3, the SSB can be set for each cell (CellA, CellB in the figure). The transmission cycle of the SSB can be set for each cell in the range of 5, 10, 20, 40, 80, and 160 ms. Further, the number of SSBs can be set for each frequency.

The cycle of the reception quality measurement performed by the UE 200 is not necessarily the same as the transmission cycle of the SSB, and an appropriate measurement cycle may be set according to the environment, so that unnecessary measurement operations can be avoided and power consumption of the UE 200 can be suppressed.

Further, in the wireless communication system 10, the network can notify the UE 200 whether the serving cell is synchronized with the adjacent cell using the same frequency. Specifically, the notification is performed by "deriveSSB-indexffromcell" contained in the Information Element (IE) of "MeasObjectNR".

The MeasObjectNR specifies Information that can be applied to intra-frequency/inter-frequency measurements of the SSBs and/or intra-frequency/inter-frequency measurements of Channel State Information Reference signals (CSI-RS). 1 MeasObjectNR may be set for 1 SSB frequency.

The deriveSSB-indexfrmcell is information indicating whether the terminal can utilize the timing of the serving cell to derive an index of the SSB transmitted by the neighboring cell. In the case where this field is set to "true", the UE 200 assumes alignment of the System Frame Number (SFN), radio Frame Number) of the cell in the serving frequency with the Frame boundary as specified in 3GPP TS 38.133.

That is, the UE 200 assumes that the serving cell is synchronized with the neighboring cells. "synchronization" may also be interpreted as the frame boundary (frame boundary) coinciding with the SFN between the serving cell and the neighboring cell. The deriversessb-indexfrmcell can be set for each SSB frequency.

In the present embodiment, such notification of synchronization between the serving cell and the neighboring cell by the deriveSSB-indexfrmcell may be applied to neighboring cells using different frequencies. In actual network operation, there are cases where a serving cell is synchronized with an adjacent cell using a different frequency, and such cases can be handled as well. Furthermore, deriverseSSB-IndexFromcell

The synchronization of the serving cell with the neighbor cells of the different frequency may follow the deriveSSB-indexfrmcell, and new IEs (fields) may also be defined.

If the MeasObjectNR received includes the deriveSSB-indexfrmcell, the UE 200 determines whether the frequency and subcarrier spacing (SCS) included in the serving cell setting information (ServingCellConfigCommon) are the same as those included in the MeasObjectNR.

In the case where the frequency and SCS are the same, the UE 200 assumes that the frame boundary coincides with the SFN between the serving cell and the neighboring cell, and detection of the SSB index is omitted in the quality measurement of the neighboring cell.

(2) Functional block structure of wireless communication system

Next, a functional block configuration of the radio communication system 10 will be described. Specifically, the functional block structure of the UE 200 will be described. Fig. 4 is a functional block diagram of the UE 200.

The radio transmission unit 210 transmits an uplink signal (UL signal) conforming to NR. The radio receiving unit 220 receives a downlink signal (DL signal) conforming to NR.

Specifically, the radio transmitter 210 and the radio receiver 220 perform radio communication via a control channel or a data channel.

The Control Channel includes a Physical Downlink Control Channel (PDCCH), a Physical Uplink Control Channel (PUCCH), a Random Access Channel (RACH), Downlink Control Information (DCI) of a Random Access Radio Network Temporary Identifier (RA-RNTI), and a Physical Broadcast Channel (PBCH).

The data Channel includes a PDSCH (Physical Downlink Shared Channel), a PUSCH (Physical Downlink Shared Channel), and the like.

In the present embodiment, the radio receiving unit 220 constitutes a receiving unit that receives synchronization information indicating that a serving cell is synchronized with an adjacent cell using a frequency different from that of the serving cell. Hereinafter, this synchronization information is referred to as "inter-frequency synchronization IE" for convenience. The iso-sync IE may be actually the same name as the deriveSSB-indexfrmcell described above, or may be a new name.

In addition, the serving cell may be simply interpreted as a cell in connection with the UE 200, but more strictly speaking, in the case of a UE of RRC _ CONNECTED that is not configured together with Carrier Aggregation (CA), the number of serving cells configuring the primary cell is only 1. In the case of an RRC _ CONNECTED UE configured using CA, the serving cell may also be interpreted as a set of 1 or more cells including the primary cell and all secondary cells.

Further, the neighboring cell may also be interpreted as a cell in which the UE 200 can measure the reception quality of the reference signal, or a cell adjacent to (formed within) the serving cell.

The SSB acquisition unit 230 acquires SSBs transmitted from the network. Specifically, the SSB acquisition unit 230 acquires SSBs periodically transmitted at predetermined positions (for example, 5ms of the first half) on the radio frame. The acquired SSB information is used for detection of a reference signal and a PDCCH.

The quality measurement unit 240 measures the reception quality of the serving cell under the control of the control unit 250. Further, the quality measurement unit 240 measures reception quality of an adjacent cell formed in the vicinity of (or within) the serving cell.

Specifically, the quality measurement unit 240 measures Reference Signal Received Power (RSRP) of the serving cell and the neighboring cell. In addition to RSRP, Reference Signal Received Quality (RSRQ), Signal-to-Interference plus Noise power Ratio (SINR), and the like may be used.

The control unit 250 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 250 performs control related to measurement of the serving cell and the neighboring cell.

Specifically, when receiving the inter-frequency synchronization IE indicating that the serving cell is synchronized with an adjacent cell using a frequency different from that of the serving cell, the control unit 250 can perform measurement of the adjacent cell without acquiring an index of the SSB from the adjacent cell.

That is, when the inter-frequency synchronization IE is received, the control unit 250 assumes that the neighboring cell is synchronized with the serving cell, omits acquisition of the SSB index (SSB index) transmitted from the neighboring cell, and causes the quality measurement unit 240 to perform measurement of the neighboring cell.

In addition, the measurement itself such as RSRP can be performed regardless of the presence or absence of the SSB index. When the network instructs UE 200 to notify RSRP together with the SSB index, acquisition (detection) of the SSB index by decoding PBCH or the like is necessary, but control unit 250 can omit this operation.

Further, when receiving the inter-frequency synchronization IE, the control unit 250 may acquire only the index of the SSB of any one of the plurality of neighboring cells (when the SSB can be received from the plurality of neighboring cells). That is, for another neighboring cell for which acquisition of SSB is omitted, the control unit 250 assumes that the neighboring cell is synchronized with the serving cell or another neighboring cell for which SSB is acquired.

Alternatively, when receiving the inter-frequency synchronization IE, the control unit 250 may acquire only the index (SSB index) of the SSB from the serving cell and derive the SSB index of the neighboring cell from the SSB index value.

That is, the control unit 250 may acquire only the index (SSB index) of the SSB from the serving cell and derive the index (SSB index) of the SSB from the neighboring cell. In other words, the control unit 250 may assume that the neighboring cell is synchronized with the serving cell, and omit acquisition of the SSB index (SSB index) transmitted from the neighboring cell.

When the inter-frequency synchronization IE is received, the control unit 250 can derive an index of the SSB from the neighboring cell using the frame timing of the serving cell. Specifically, the control unit 250 determines the transmission timing of the SSB from the neighboring cell based on the frame boundary (frame boundary) of the serving cell and the SFN, and detects the index of the SSB from the neighboring cell.

(3) Operation of a wireless communication system

Next, an operation of the radio communication system 10 will be described. Specifically, the quality measurement operation of the neighboring cell performed by the UE 200 will be described.

(3.1) communication timing

Fig. 5 shows a communication timing related to quality measurement of a neighboring cell by the UE 200. As shown in fig. 5, the gNB 100A (or gNB 100B) transmits an RRC message containing MeasObjectNR to the UE 200 (S10).

The UE 200 acquires MeasObjectNR contained in the RRC message (S20). As described above, MeasObjectNR specifies Information that can be applied to intra-frequency/inter-frequency measurements of SSBs and/or intra-frequency/inter-frequency measurements of Channel State Information Reference signals (CSI-RS).

The UE 200 performs quality measurement according to the acquired content of MeasObjectNR (S30). Specifically, the UE 200 acquires the SSBs transmitted from the neighboring cells, and measures the reception quality (RSPP, etc.) of the neighboring cells (which may include the serving cell).

The UE 200 transmits a measurement report containing the measured reception quality of the neighboring cell to the gNB 100A (S40).

(3.2) operation procedure

Next, the measurement operation performed by the UE 200 with respect to the neighboring cell will be further described. Specifically, operation examples 1 to 3 of the measurement of the neighboring cell performed by the UE 200 will be described.

(3.2.1) operation example 1

Fig. 6 shows a quality measurement action flow of the neighboring cells by the UE 200. As shown in fig. 6, the UE 200 acquires MeasObjectNR (S110).

The UE 200 determines whether the MeasObjectNR contains the inter-frequency synchronization IE (S120). As described above, the difference is that the serving cell is synchronized with a neighboring cell using a different frequency from the serving cell and is applied to a neighboring cell of an inter-frequency, and the rest is the same as the deriveSSB-indexfrmcell of 3GPP release 15.

When the inter-frequency synchronization IE is included in the MeasObjectNR, the UE 200 acquires only the SSB index (SSB index) of any one of the neighboring cells and omits the detection for the other cells (S130).

Specifically, when the pilot synchronization IE is included in the received MeasObjectNR, the UE 200 confirms whether the frequency and subcarrier spacing (SCS) included in the serving cell setting information (ServingCellConfigCommon) are the same as those included in the MeasObjectNR.

In the case where the frequencies and SCS included in the ServingCellConfigCommon are the same as those included in the MeasObjectNR, the UE 200 assumes that between the serving cell and the neighboring cell, the frame boundary (frame boundary) coincides with the System Frame Number (SFN), omitting the detection of the SSB index at the time of measurement of the neighboring cell.

More specifically, in 3GPP TS38.133 (chapter 9.2.5), with respect to Intra-frequency measurements (Intra-frequency measurements), the following 2 modes are defined.

(i)T_{identify_intra_without_index}＝(T_{PSS/SSS_sync_intra}+T_{SSB_measurement_period_intra})ms

(ii)T_{identify_intra_with_index}＝(T_{PSS/SSS_sync_intra}+T_{SSB_measurement_period_intra}+T_{SSB_time_index_intra})ms

Similarly to the specification of 3GPP TS38.133 (chapter 9.2.5), when the inter-frequency synchronization IE is included, even if a setting is made to transmit the measurement result of the reception quality together with the SSB index as a measurement report, the above-described (i) and T are always applied_{identify_intra_without_index}(i.e., T may be omitted)_{SSB_time_index_intra})。

In addition, for the neighbor cell in which the detection of the SSB index is omitted, the SSB index of the neighbor cell in which the SSB index is detected and/or the measurement result may be used.

On the other hand, if the MeasObjectNR does not include the inter-frequency synchronization IE, the UE 200 acquires the indices of the SSBs of all neighboring cells (S140). In this case, the UE 200 may also assume that the neighboring cell is not synchronized with the serving cell.

The UE 200 performs quality measurement of the neighboring cell based on the acquired SSB index (S150).

(3.2.2) operation example 2

The processing of S130 in operation example 1 shown in fig. 6 may be replaced as follows. Fig. 7 shows the processing content (1 thereof) of the processing of S130 of alternative operation example 1.

As shown in fig. 7, when the inter-frequency synchronization IE is included in the MeasObjectNR, the UE 200 acquires only the index (SSB index) of the SSB of the serving cell (S130A).

In this case, the UE 200 may regard the acquisition result of the SSB index in the serving cell as the SSB index of the neighboring cell using the inter-frequency.

(3.2.3) operation example 3

The processing of S130 in operation example 1 shown in fig. 6 may be further replaced as follows. Fig. 8 shows the processing content (2 thereof) of the processing of S130 of alternative operation example 1.

As shown in fig. 8, when the iso-frequency synchronization IE is included in the MeasObjectNR, the UE 200 acquires the frame timing of the serving cell (S131B). Specifically, the UE 200 determines the frame boundary (frame boundary) and the SFN of the serving cell as described above.

Next, the UE 200 derives an SSB index (SSB index) of the neighboring cell from the acquired frame timing of the serving cell (S132B). Specifically, the UE 200 determines the transmission timing of the SSB from the neighboring cell based on the frame boundary (frame boundary) of the serving cell and the SFN, and detects the index of the SSB from the neighboring cell.

(3.2.3) others

When the above-described inter-frequency synchronization IE is transmitted from the network, the UE 200 may assume the synchronization source, that is, the serving cell to be referred to, as any one of the following.

(I) Distinctive segments based on operating status (DC: dual connectivity), Carrier Aggregation (CA: Carrier Aggregation), NSA (Non-independent)/SA (independent)

Case of EN (E-UTRA-NR) -DC: SCG (Secondary Cell Group: Secondary Cell Group) PCell (Primary Cell: Primary Cell)

NR-DC case: MCG (Master Cell Group: Primary Cell Group) PCell

Case of NE (NR-E-UTRA) -DC: MCG PCell

Case of SA/NR CA: PCell

(ii) CG conforming to inter-frequency synchronization IE set

When the setting is made from the MCG side, the MCG PCell is assumed, and when the setting is made from the SCG side, the SCG PCell is assumed

(iii) Specifying which CG (MCG or SCG) or PCell to follow along with the inter-frequency synchronization IE

(4) action/Effect

According to the above embodiment, the following operational effects can be obtained. Specifically, when receiving the inter-frequency synchronization IE, the UE 200 can perform measurement of the neighboring cell without acquiring the index (SSB index) of the SSB from the neighboring cell.

Therefore, even when the serving cell is synchronized with a neighboring cell using a frequency different from that of the serving cell, the UE 200 can omit acquisition of the SSB index of the neighboring cell and can realize efficient measurement of the neighboring cell.

That is, according to the UE 200, the efficiency of quality measurement of the neighboring cell can be further improved. This can reduce power consumption of the UE 200, shorten measurement time, and improve efficiency of network control.

Specifically, if the measurement is not applied to a neighboring cell having a different frequency from the serving cell, as in the deriveSSB-indexfrmcell of release 15 of 3GPP, the measurement result of the reception quality is measured as a measurement result together with the SSB index for the neighboring cellIn the case of setting the report transmission, the above-mentioned T is always applied_{identify_inter_with_index}. Thus, the UE 200 cannot omit T_{SSB_time_index_inter}Even when the serving cell is synchronized with the neighboring cell using the pilot frequency, the SSB index of the neighboring cell must be acquired, which may result in unnecessary measurement (acquisition of the SSB index). According to the UE 200, such unnecessary measurements can be avoided.

In the present embodiment, when receiving the inter-frequency synchronization IE, the UE 200 may acquire only the index of the SSB of any one of the plurality of neighboring cells and use the value. Therefore, unnecessary measurements for neighboring cells can be avoided.

In the present embodiment, when receiving the inter-frequency synchronization IE, the UE 200 can acquire only the index of the SSB from the serving cell. Therefore, the SSB index of the neighboring cell can be derived from the SSB index of the serving cell, and unnecessary measurements can be avoided.

In the present embodiment, when receiving the inter-frequency synchronization IE, the UE 200 can derive the index of the SSB from the neighboring cell using the frame timing of the serving cell. Therefore, by deriving the SSB index of the neighboring cell from the frame timing of the serving cell, it is possible to improve the accuracy of acquiring the SSB index of the neighboring cell and avoid unnecessary measurements.

(5) Other embodiments

While the present invention has been described with reference to the embodiments, it is apparent to those skilled in the art that the present invention is not limited to the descriptions, and various modifications and improvements can be made.

For example, although the above-described embodiment describes an example in which acquisition of an SSB from an adjacent cell is omitted, the present invention can be applied to either an SS or a PBCH as a synchronization signal block from an adjacent cell. That is, either or both of the SS or PBCH may also be interpreted as a synchronization signal block.

In addition, the serving cell may be replaced with a connected cell, a connection target cell, a primary cell, or the like. In addition, the neighboring cell may be replaced with a neighboring cell or a peripheral cell.

The block diagram (fig. 4) used in the description of the above embodiment shows blocks in units of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one device that is physically or logically combined, or may be implemented by two or more devices that are physically or logically separated and that are directly or indirectly (for example, wired or wireless) connected and implemented by these plural devices. The functional blocks may also be implemented by a combination of software and one or more of the above-described devices.

The functions include, but are not limited to, determination, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), and the like. For example, a function block (a configuration unit) that functions as a transmitter is referred to as a transmitter (transmitting unit) or a transmitter (transmitter). In short, as described above, the implementation method is not particularly limited.

The UE 200 described above may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram showing an example of the hardware configuration of the UE 200. As shown in fig. 9, the UE 200 may be configured as a computer device including a processor 1001, a memory (memory)1002, a memory (storage)1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In the following description, the term "device" may be replaced with "circuit", "device", "unit", and the like. The hardware configuration of the apparatus may include one or more of the illustrated apparatuses, or may not include some of the apparatuses.

Each functional block of the UE 200 (see fig. 4) is realized by any hardware element or combination of hardware elements in the computer device.

Further, each function in the UE 200 is realized by the following method: predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs an operation to control communication of the communication device 1004 or at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be a Central Processing Unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance therewith. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. The various processes described above may be executed by one processor 1001, but may be executed by two or more processors 1001 at the same time or sequentially. The processor 1001 may also be mounted by more than one chip. In addition, the program may also be transmitted from the network via a telecommunication line.

The Memory 1002 is a computer-readable recording medium, and may be configured by at least one of a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), an Electrically Erasable Programmable Read Only Memory (EEPROM), a Random Access Memory (RAM), and the like. Memory 1002 may also be referred to as registers, cache, main memory (primary storage), etc. The memory 1002 may store a program (program code), a software module, and the like capable of executing the method of one embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be configured by at least one of an optical disk such as a Compact disk ROM (CD-ROM), a hard disk drive, a Floppy disk, a magneto-optical disk (for example, a Compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (for example, a card, a stick, a Key drive), a Floppy (registered trademark) disk, a magnetic stripe, and the like.

The communication device 1004 is hardware (a transmitting/receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and may be referred to as a network device, a network controller, a network card, a communication module, or the like.

Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, for example, in order to realize at least one of Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrally formed (for example, a touch panel).

The processor 1001 and the memory 1002 are connected to each other via a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using different buses for each device.

The apparatus may include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), and a Field Programmable Gate Array (FPGA), and a part or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

Note that the information is not limited to the form and embodiment described in the present disclosure, and may be notified by another method. For example, the notification of the Information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast Information (Master Information Block), System Information Block (SIB), other signals, or a combination thereof).

The forms/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), SUPER 3G, IMT-Advanced, fourth generation mobile communication system (4G: 4th generation mobile communication system), fifth generation mobile communication system (5G: 5th generation mobile communication system), Future Radio Access (FRA: Future Radio Access), New air interface (NR: New Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate systems, and next generation systems extended accordingly. Furthermore, a plurality of systems may be combined (for example, a combination of 5G and at least one of LTE and LTE-a) to be applied.

For the processing procedures, timings, flows, and the like of the respective forms/embodiments described in the present disclosure, the order may be changed without contradiction. For example, elements of the various steps are presented using the order illustrated for the methods described in this disclosure, and are not limited to the particular order presented.

In the present disclosure, it is assumed that a specific operation performed by a base station is sometimes performed by an upper node (upper node) of the base station depending on the situation. It is obvious that in a network including one or more network nodes (network nodes) having a base station, various operations to be performed for communication with a terminal may be performed by at least one of the base station and a network node other than the base station (for example, MME, S-GW, or the like is considered, but not limited thereto). In the above, the case where there is one network node other than the base station is exemplified, but the other network node may be a combination of a plurality of other network nodes (e.g., MME and S-GW).

Information, signals (information, etc.) can be output from an upper layer (or lower layer) to a lower layer (or upper layer). Or may be input or output via a plurality of network nodes.

The input or output information may be stored in a specific location (for example, a memory) or may be managed using a management table. The information that is input or output may be overwritten, updated or appended. The output information may also be deleted. The entered information may also be transmitted to other devices.

The determination may be made by a value (0 or 1) represented by 1 bit, may be made by a Boolean value (true or false), or may be made by comparison of values (for example, comparison with a predetermined value).

The aspects and embodiments described in the present disclosure may be used alone or in combination, or may be switched to use with execution. Note that the notification of the predetermined information is not limited to be performed explicitly (for example, notification of "X") but may be performed implicitly (for example, notification of the predetermined information is not performed).

Software, whether referred to as software, firmware, middleware, microcode, hardware description languages, or by other names, should be construed broadly to mean commands, command sets, code segments, program code, programs (routines), subroutines, software modules, applications, software packages, routines (routines), subroutines (subroutines), objects, executables, threads of execution, procedures, functions, and the like.

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

Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions (commands), information, signals, bits, symbols (symbols), chips (chips), etc., that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Further, the signal may also be a message. Further, a Component Carrier (CC) may also be referred to as a Carrier frequency, a cell, a frequency Carrier, and the like.

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

In addition, information, parameters, and the like described in the present disclosure may be expressed by absolute values, may be expressed by relative values to predetermined values, and may be expressed by other corresponding information. For example, the radio resource may also be indicated by an index.

The names used for the above parameters are in no way limiting. Further, the numerical expression and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by all appropriate names, and thus the various names assigned to these various channels and information elements are not limiting in any respect.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station", "NodeB", "enodeb (enb)", "gnnodeb (gnb)", "access point", "transmission point", "reception point", "cell", "sector", "cell group", "carrier", "component carrier" may be used interchangeably. A base station may also be referred to by terms such as macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., 3) cells (also referred to as sectors). When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small Radio Head (RRH) for indoor use).

The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that performs communication service within the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", "terminal" and the like may be used interchangeably.

With respect to a mobile station, those skilled in the art will also sometimes refer to a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communications device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent (user agent), a mobile client, a client, or some other suitable terminology.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, 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 (e.g., an automobile, an airplane, etc.), may be a moving body that moves in an unmanned manner (e.g., an unmanned aerial vehicle, an autonomous automobile, etc.), or may be a robot (manned or unmanned). At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

In addition, the base station in the present disclosure may be replaced with a mobile station (user terminal, the same applies hereinafter). For example, the aspects/embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between a plurality of mobile stations (e.g., may also be referred to as Device-to-Device (D2D), Vehicle-to-all system (V2X), and the like). In this case, the mobile station may have a function of the base station. Terms such as "uplink" and "downlink" may be replaced with terms (e.g., "side") corresponding to inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

Likewise, the mobile stations in the present disclosure may also be replaced with base stations. In this case, the base station may have a function of the mobile station.

The radio frame may also be composed of 1 or more frames in the time domain. In the time domain, 1 or more individual frames may also be referred to as subframes.

The subframe may be formed of 1 or more slots in the time domain. The subframe may be a fixed time length (e.g., 1ms) independent of a parameter (numerology).

The parameter set may also be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may also indicate, for example, at least one of SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the Time domain, and the like.

The slot may also be formed of one or more symbols in the time domain (an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.). The time slot may also be a time unit based on a parameter set.

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

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. Radio frames, subframes, slots, mini-slots, and symbols may also use other designations corresponding thereto.

For example, 1 subframe may also be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may also be referred to as TTIs, and a 1 slot or 1 mini-slot may also be referred to as a TTI. That is, at least one of the subframe and TTI may be an existing subframe (1ms) in LTE, may be a period shorter than 1ms (for example, 1-13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like that can be used by each user terminal) to each user terminal in units of TTIs. In addition, the definition of TTI is not limited thereto.

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

When 1 slot or 1 mini-slot is referred to as TTI, 1 or more TTI (i.e., 1 or more slot or 1 or more mini-slot) may be the minimum time unit for scheduling. Further, the number of slots (the number of mini slots) constituting the minimum time unit of the schedule may be controlled.

The TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than that of the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) may also be a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, includes one or more consecutive subcarriers (subcarriers). The number of subcarriers included in an RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may be decided based on the parameter set.

The time domain of the RB may include one or more symbols, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. The 1TTI, 1 subframe, and the like may be formed of 1 or more resource blocks, respectively.

In addition, one or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB peers, and so on.

In addition, a Resource block may also be composed of one or more Resource Elements (REs). For example, the 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

The Bandwidth Part (BWP: Bandwidth Part) (may also be referred to as partial Bandwidth, etc.) may also indicate a subset of consecutive common RBs (common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may be defined by a certain BWP, or may be numbered within the BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). One or more BWPs may also be set within 1 carrier for the UE.

At least one of the set BWPs may be active (active), or the UE may not be assumed to transmit and receive a predetermined signal/channel outside the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced with "BWP".

The above-described structures of radio frames, subframes, slots, mini-slots, symbols, and the like are merely examples. For example, the structure of the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.

The term "connected" or "coupled" or any variation of these terms is intended to mean that 2 or more elements are directly or indirectly connected or coupled to each other, and may include 1 or more intermediate elements between 2 elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connect" may also be replaced with "Access". As used in this disclosure, 2 elements may be considered to be "connected" or "coupled" to each other by using at least one of 1 or more electrical wires, cables, and printed electrical connections, and by using electromagnetic energy or the like having wavelengths in the wireless frequency domain, the microwave region, and the optical (both visible and invisible) region, as some non-limiting and non-inclusive examples.

The reference signal can also be referred to as rs (reference signal) for short, and also as Pilot (Pilot) according to the applied standard.

As used in this disclosure, a statement "according to" is not intended to mean "solely according to" unless explicitly stated otherwise. In other words, the statement "according to" means both "according to only" and "according to at least".

The "unit" in the configuration of each device described above may be replaced with a "section", "circuit", "device", or the like.

Any reference to using the terms "1 st," "2 nd," etc. as used in this disclosure is not intended to limit the number or order of such elements. These terms can be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, references to elements 1 and 2 do not indicate that only 2 elements can be taken here or that the element 1 must precede the element 2 in any way.

In the present disclosure, when the terms "including", "containing" and variations thereof are used, these terms are meant to be inclusive in the same manner as the term "having". Also, the term "or" used in the present disclosure means not exclusive or.

In the present disclosure, for example, in the case where articles are added as a result of translation as in a, an, and the in english, the present disclosure may also include the case where nouns following these articles are plural forms.

Terms such as "determining" and "determining" used in the present disclosure may include various operations. The terms "determining" and "decision" may include, for example, a case where the determination (judging), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) (for example, a search in a table, a database, or another data structure), and confirmation (ascertaining) are regarded as being performed. The "determination" and "decision" may include a case where the reception (e.g., reception) or transmission (e.g., transmission), input (input), output (output), and access (e.g., access to data in the memory) are regarded as the "determination" and "decision". The "determination" and "decision" may include cases in which the "determination" and "decision" are considered to be performed, for example, when the solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), and comparison (comparing) are performed. That is, "determination" and "determination" may include a case where "determination" and "determination" are performed in any operation. The "judgment (decision)" may be replaced with "assumption", "expectation", "consideration", and the like.

In the present disclosure, the phrase "a and B are different" may also mean "a and B are different from each other". The term "A and B are different from C" may be used. The terms "separate," combine, "and the like may likewise be construed as" different.

While the present disclosure has been described in detail, it should be apparent to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and alterations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the disclosure is intended to be illustrative, and not limiting.

Description of the reference symbols

10: a wireless communication system;

20: a wireless access network;

100A、100B：gNB；

200：UE；

210: a wireless transmission unit;

220: a wireless receiving unit;

230; an SSB acquisition unit;

240; a mass measurement unit;

250: a control unit;

1001; a processor;

1002: memory device

1003: a memory;

1004: a communication device;

1005: an input device;

1006: an output device;

1007: bus line

Claims (4)

1. A terminal, having:

a reception unit that receives synchronization information indicating that a serving cell and an adjacent cell use a different frequency from the serving cell are synchronized; and

a control unit that, when the synchronization information is received, performs measurement of the neighboring cell without acquiring an index of a synchronization signal block from the neighboring cell.

2. The terminal of claim 1, wherein,

the control unit acquires only an index of the synchronization signal block in any one of the plurality of adjacent cells when the synchronization information is received.

3. The terminal of claim 1, wherein,

the control unit acquires only an index of the synchronization signal block from the serving cell and derives an index of the synchronization signal block from the neighboring cell when the synchronization information is received.

4. The terminal of claim 1, wherein,

the control unit derives an index of the synchronization signal block from the neighboring cell using a frame timing of the serving cell when the synchronization information is received.

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