WO2022079874A1

WO2022079874A1 - Terminal, base station, and communication method

Info

Publication number: WO2022079874A1
Application number: PCT/JP2020/038994
Authority: WO
Inventors: 尚哉芝池; 慎也熊谷; 浩樹原田; 真由子岡野
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-10-15
Filing date: 2020-10-15
Publication date: 2022-04-21

Abstract

This terminal has: a reception unit that executes sensing; and a control unit that sets a channel access mechanism on the basis of a comparison between a threshold value and a numerical value indicated by the result of the sensing.

Description

Terminals, base stations and communication methods

The present invention relates to a terminal, a base station and a communication method in a wireless communication system.

In NR (New Radio) (also referred to as "5G"), which is the successor system to LTE (Long Term Evolution), the requirements are a large capacity system, high-speed data transmission speed, low delay, and simultaneous use of many terminals. Techniques that satisfy connection, low cost, power saving, etc. are being studied (for example, Non-Patent Document 1).

In NR release 17, it is considered to use a higher frequency band than the conventional release (for example, Non-Patent Document 2). For example, in the frequency band from 52.6 GHz to 71 GHz, applicable numerology including subcarrier spacing, channel bandwidth, etc., physical layer design, obstacles assumed in actual wireless communication, and the like are being studied.

Both channel access with LBT (Listen before talk) and channel access without LBT are supported in the newly operated frequency band that uses a higher frequency than before. For example, in order to comply with the regulations of each country, it becomes necessary to switch between channel access with LBT and channel access without LBT.

However, the conditions or method for switching between channel access with LBT and channel access without LBT were not clear.

The present invention has been made in view of the above points, and in a wireless communication system, the channel access mechanism can be switched according to the communication environment.

According to the disclosed technique, a terminal having a receiving unit that executes sensing and a control unit that sets a channel access mechanism based on a comparison between a numerical value indicated by the sensing result and a threshold value is provided.

According to the disclosed technology, the channel access mechanism can be switched according to the communication environment in the wireless communication system.

It is a figure which shows the structural example of the wireless communication system in embodiment of this invention. It is a figure which shows the example of the frequency range in embodiment of this invention. It is a flowchart for demonstrating the channel access in embodiment of this invention. It is a figure which shows an example of the functional structure of the base station 10 in embodiment of this invention. It is a figure which shows an example of the functional structure of the terminal 20 in embodiment of this invention. It is a figure which shows an example of the hardware composition of the base station 10 or the terminal 20 in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

The existing technique is appropriately used in the operation of the wireless communication system according to the embodiment of the present invention. However, the existing technique is, for example, an existing LTE, but is not limited to the existing LTE. Further, the term "LTE" used in the present specification has a broad meaning including LTE-Advanced and LTE-Advanced and later methods (eg, NR) unless otherwise specified.

Further, in the embodiment of the present invention described below, SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical) used in the existing LTE. Random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), etc. are used. This is for convenience of description, and signals, functions, etc. similar to these may be referred to by other names. Further, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH and the like. However, even if it is a signal used for NR, it is not always specified as "NR-".

Further, in the embodiment of the present invention, the duplex system may be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or any other system (for example, Flexible Duplex, etc.). Method may be used.

Further, in the embodiment of the present invention, "configuring" the radio parameter or the like may mean that a predetermined value is set in advance (Pre-configure), or the base station 10 or The radio parameter notified from the terminal 20 may be set.

FIG. 1 is a diagram showing a configuration example of a wireless communication system according to an embodiment of the present invention. The wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20 as shown in FIG. Although FIG. 1 shows one base station 10 and one terminal 20, this is an example, and each of them may be plural.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the radio signal are defined in the time domain and the frequency domain, the time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain is defined by the number of subcarriers or the number of resource blocks. May be good. The base station 10 transmits a synchronization signal and system information to the terminal 20. Synchronous signals are, for example, NR-PSS and NR-SSS. The system information is transmitted by, for example, NR-PBCH, and is also referred to as broadcast information. The synchronization signal and system information may be referred to as SSB (SS / PBCH block). As shown in FIG. 1, the base station 10 transmits a control signal or data to the terminal 20 by DL (Downlink), and receives the control signal or data from the terminal 20 by UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming to transmit and receive signals. Further, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Further, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) by CA (Carrier Aggregation). Further, the terminal 20 may perform communication via a primary cell of the base station 10 by DC (Dual Connectivity) and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10.

The terminal 20 is a communication device having a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, and a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives a control signal or data from the base station 10 by DL, and transmits the control signal or data to the base station 10 by UL, so that various types provided by the wireless communication system are provided. Use communication services. Further, the terminal 20 receives various reference signals transmitted from the base station 10, and measures the propagation path quality based on the reception result of the reference signals.

FIG. 2 is a diagram showing an example of a frequency range according to an embodiment of the present invention. In the NR specifications of 3GPP Release 15 and Release 16, for example, it is considered to operate a frequency band of 52.6 GHz or higher. As shown in FIG. 2, FR (Frequency range) 1 whose current operation is regulated is a frequency band from 410 MHz to 7.125 GHz, and SCS (Sub carrier spacing) is 15, 30 or 60 kHz. The bandwidth is from 5 MHz to 100 MHz. FR2 is a frequency band from 24.25 GHz to 52.6 GHz, SCS uses 60, 120 or 240 kHz and the bandwidth is 50 MHz to 400 MHz. For example, the newly operated frequency band may be assumed to be from 52.6 GHz to 114.25 GHz.

As a regulation in the frequency band as described above, for example, in CEPT (European Conference of Postal and Telecommunications Administrations), there is a regulation that executes LBT (Listen before talk) as a mandate. There are also regulations that require that LBT not be performed. Which regulation is used is determined by the mobility of the terminal 20, for example, whether the terminal 20 is a fixed terminal or a mobile terminal. Further, for example, the FCC (Federal Communications Commission) does not specify a requirement for reducing interference in the 57-71 GHz band.

Further, in 3GPP, it is considered to support both channel access with LBT and channel access without LBT when the base station 10 or the terminal 20 starts occupying the channel. Further, regarding the LBT mechanism, an omni-directional LBT, a directional LBT, and an LBT type mechanism executed by a receiver are being studied.

Also, whether or not operational restrictions are necessary for channel access that does not execute LBT is being examined. For example, in order to satisfy the regulation, for channel access that does not execute LBT when ATPC (Automatic Transmit Power Control), DFS (Dynamic Frequency Selection), long-term sensing (long term sensing) or other interference reduction mechanism exists. On the other hand, whether or not operational restrictions are necessary is being considered.

In addition, a mechanism or condition for switching between a channel access that executes LBT and a channel access that does not execute LBT (for example, assuming that it is permitted by local regulation) is being studied.

For example, in the 60 GHz band, it is considered to support two media access mechanisms, a channel access that executes LBT and a channel access that does not execute LBT.

Also, for example, it is being considered to support three types of channel access, such as no LBT, long-term sensing, and short-term sensing. For example, “without LBT” may be applied when EIRP (Equivalent Isotropically Radiated Power), transmission power, channel occupancy duty cycle, characteristics related to spatial multiplexing, and the like satisfy the conditions. Long-term sensing is also an approach that allows the beam to be reused when many beam collisions occur. On the other hand, the measurement gap and the long-term sensing gap are non-useful. Short-term sensing is a type of LBT.

However, the conditions or method for switching between channel access with LBT and channel access without LBT were not clear. Therefore, we propose to switch the channel access mechanism based on the sensing result.

FIG. 3 is a flowchart for explaining channel access in the embodiment of the present invention. In step S1, the terminal 20 executes sensing. In the following step S2, the terminal 20 compares a certain threshold value with the sensing result. In a subsequent step S3, the terminal 20 may switch, change, determine, set, or report the channel access mechanism based on the comparison in step S2. You may. The sensing in step S1 may be long-term sensing.

A fixed value may be set as the threshold value used in step S2. For example, it may be XdB, or it may be a power density per band such as XdB / MHz. The threshold is variable and may be determined based on, for example, at least one of sensing bandwidth, sensing directivity and sensing periodicity.

As an example of switching the channel access mechanism in step S3, when the sensing result exceeds the threshold value, a transmitting device executes the directional LBT by applying a random backoff, and when the sensing result does not exceed the threshold value, the relevant transmission device is applied. The transmitting device may perform the directional LBT without applying a random backoff. The transmitting device may be a base station 10 or a terminal 20.

Further, as an example of switching the channel access mechanism in step S3, when the sensing result exceeds the threshold value, a certain transmitting device executes omnidirectional LBT, and when the sensing result does not exceed the threshold value, the transmitting device is directed. Sexual LBT may be performed. The transmitting device may be a base station 10 or a terminal 20.

Further, as an example of switching the channel access mechanism in step S3, when the sensing result exceeds the threshold value, one receiving device reports to another device that the directional LBT is executed by applying a random backoff. May be good. If the sensing result does not exceed the threshold, one transmitting device may not report or may perform a directional LBT without applying a random backoff. The receiving device may be the base station 10 and transmit the report to the terminal 20, or the terminal 20 may transmit the report to the base station 10.

The sensing in step S1 shown in FIG. 3 may be executed as shown in 1) -4) below.

1) Periodic sensing Sensing may be performed periodically. The period may be predetermined in the specifications, may be set by the RRC (Radio Resource Control) setting, or may be set by the MAC-CE (Medium Access Control-Control Element). Also, sensing may be performed semi-persistently and may be enabled or disabled. Switching between valid and invalid may be performed according to specific conditions, RRC settings or MAC-CE settings.

2) Target range of sensing Sensing may be performed in the entire range around the target device in the Omni directional. Also, the sensing may have directivity. It may sense a single direction of the target device. Further, a plurality of directions of the target device may be sensed, or the entire surrounding range may be switched and sensed.

3) Threshold value for sensing A fixed value may be set as the threshold value used for sensing. For example, it may be XdB, or it may be a power density per band such as XdB / MHz. The threshold is variable and may be changed based on, for example, the sensing bandwidth, the sensing directivity or the sensing periodicity.

4) Sensing mechanism Sensing may use the results of existing channel occupancy measurement (Channel occupancy measurement) or other RRM (Radio resource management) results. good.

The channel access mechanism used in step S3 shown in FIG. 3 may be an LBT mechanism. For example, the target range of the sensing of the LBT may be executed in the entire range around the target device. Also, the sensing may have directivity. It may sense a single direction of the target device. Further, a plurality of directions of the target device may be sensed, or the entire surrounding range may be switched and sensed.

The timing to start sensing the LBT may be immediately before transmission, for example, LBE (Load Based Equipment). Further, the timing for starting the sensing of the LBT may be periodic, for example, FBE (Frame Based Equipment).

Random backoff may be applied during the sensing period of the LBT. Further, the sensing period of the LBT may be a fixed period without applying the random backoff.

The channel access mechanism used in step S3 shown in FIG. 3 may be a channel access mechanism other than LBT. For example, ATPC (Automatic Transmit Power Control) may be applied to the transmission power control, or DFS (Dynamic Frequency Selection) may be applied to the frequency resource switching. Here, the operation of ATPC, DFS and the like may be specified in the non-3GPP specifications, and in the 3GPP specifications, it may be described that they follow the non-3GPP specifications.

The channel access mechanism used in step S3 shown in FIG. 3 may be a non-LBT mechanism. That is, the LBT mechanism and the non-LBT mechanism may be switched and used. The non-LBT mechanism may mean that the channel access mechanism is not applied, or it may mean that a channel access mechanism other than LBT is used.

A plurality of types of LBT or non-LBT channel access mechanisms having different parameters may be switched in step S3 shown in FIG.

In step S3 shown in FIG. 3, a period during which the determined or switched channel access mechanism can be applied may be set. The period may be a fixed period, may be determined based on the comparison result between the sensing result and the threshold value in step S2, or may be determined based on the timing at which the sensing result in step S1 is acquired. Alternatively, the period may be the same as that of the sensing in step S1.

Note that the sensing result in step S1 shown in FIG. 3 may be used. For example, the sensing result may be periodically reported to other devices. For example, the existing RRM may be reused. The existing RRM includes, for example, RLM (Radiolink monitoring), BFR (Beam failure recovery), CBD (Candidate beam detection), L1 measurement, intraband measurement, interband measurement, etc. It may be a channel occupancy measurement.

For example, based on the reported sensing result, the reported device may set the channel access mechanism to be used for the reported device. For example, the device that received the report may be the base station 10, and the device that received the report may be the terminal 20.

Further, for example, the device may determine or set the channel access mechanism used by the device based on the sensing result acquired by the device, or the device located in the same cell or frequency band as the device. In addition, the device may determine or configure the channel access mechanism to use. For example, the device may be the base station 10, and the device located in the same cell or frequency band as the device may be the terminal 20.

According to the above embodiment, the base station 10 and the terminal 20 can set an appropriate channel access mechanism in the own device or another device based on the sensing result.

That is, in the wireless communication system, the channel access mechanism can be switched according to the communication environment.

(Device configuration)
Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include a function for carrying out the above-described embodiment. However, the base station 10 and the terminal 20 may each have only a part of the functions in the embodiment.

<Base station 10>
FIG. 4 is a diagram showing an example of the functional configuration of the base station 10 according to the embodiment of the present invention. As shown in FIG. 4, the base station 10 has a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 4 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be performed.

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. Further, the transmission unit 110 transmits a message between network nodes to another network node. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals and the like to the terminal 20. Further, the receiving unit 120 receives a message between network nodes from another network node.

The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information is, for example, information related to the channel access setting.

The control unit 140 controls the channel access setting as described in the embodiment. Further, the control unit 240 controls the LBT. Further, the control unit 140 executes scheduling. The function unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the function unit related to signal reception in the control unit 140 may be included in the reception unit 120.

<Terminal 20>
FIG. 5 is a diagram showing an example of the functional configuration of the terminal 20 according to the embodiment of the present invention. As shown in FIG. 5, the terminal 20 has a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 5 is only an example. Any function classification and name of the functional unit may be used as long as the operation according to the embodiment of the present invention can be performed.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a signal of a higher layer from the received signal of the physical layer. Further, the receiving unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals and the like transmitted from the base station 10. Further, for example, the transmission unit 210 may use PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel) as D2D communication on another terminal 20. Etc. are transmitted, and the receiving unit 220 receives PSCCH, PSSCH, PSDCH, PSBCH, etc. from the other terminal 20.

The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores preset setting information. The content of the setting information is, for example, information related to the channel access setting.

The control unit 240 controls the channel access setting as described in the embodiment. Further, the control unit 240 controls the LBT. The function unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the function unit related to signal reception in the control unit 240 may be included in the reception unit 220.

(Hardware configuration)
The block diagram (FIGS. 4 and 5) used in the description of the above embodiment shows a block of functional units. 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. Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but limited to these I can't. For example, a functional block (configuration unit) that makes transmission function is called a transmitting unit (transmitting unit) or a transmitter (transmitter). In each case, as described above, the realization method is not particularly limited.

For example, the base station 10, the terminal 20, and the like in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. FIG. 6 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to the embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. May be good.

In the following explanation, the word "device" can be read as a circuit, device, unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For each function in the base station 10 and the terminal 20, by loading predetermined software (program) on the hardware such as the processor 1001 and the storage device 1002, the processor 1001 performs an calculation and controls the communication by the communication device 1004. It is realized by controlling at least one of reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, the above-mentioned control unit 140, control unit 240, and the like may be realized by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 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. For example, the control unit 140 of the base station 10 shown in FIG. 4 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Further, for example, the control unit 240 of the terminal 20 shown in FIG. 5 may be realized by a control program stored in the storage device 1002 and operated by the processor 1001. Although it has been described that the various processes described above are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. Processor 1001 may be mounted by one or more chips. The program may be transmitted from the network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium, and is, for example, by at least one of ROM (ReadOnlyMemory), EPROM (ErasableProgrammableROM), EEPROM (ElectricallyErasableProgrammableROM), RAM (RandomAccessMemory), and the like. It may be configured. The storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The storage device 1002 can store a program (program code), a software module, or the like that can be executed to implement the communication method according to the embodiment of the present disclosure.

The auxiliary storage device 1003 is a computer-readable recording medium, and is, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, an optical magnetic disk (for example, a compact disk, a digital versatile disk, Blu). -It may be composed of at least one of a 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 strip, and the like. The storage medium described above may be, for example, a database, server or other suitable medium containing at least one of the storage device 1002 and the auxiliary storage device 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, and the like in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). It may be composed of. For example, the transmission / reception antenna, the amplifier unit, the transmission / reception unit, the transmission line interface, and the like may be realized by the communication device 1004. The transmission / reception unit may be physically or logically separated from each other in the transmission unit and the reception unit.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an 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).

Further, each device such as the processor 1001 and the storage device 1002 is connected by the bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

Further, the base station 10 and the terminal 20 are hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured to include, and a part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Summary of embodiments)
As described above, according to the embodiment of the present invention, the receiving unit that executes sensing, the control unit that sets the channel access mechanism based on the comparison between the numerical value indicated by the sensing result and the threshold value. A terminal with and is provided.

With the above configuration, the terminal 20 can set an appropriate channel access mechanism in its own device based on the sensing result. That is, in the wireless communication system, the channel access mechanism can be switched according to the communication environment.

Even if the receiving unit executes the sensing by omnidirectional sensing or directional sensing, and the early control unit determines the threshold value based on the sensing bandwidth, the directivity of the sensing, or the periodicity of the sensing. good. With this configuration, the terminal 20 can set an appropriate channel access mechanism in its own device based on the sensing result.

When the numerical value indicated by the sensing result is higher than the threshold value, the early control unit sets the channel access mechanism to omnidirectional LBT (Listen before talk), and when the numerical value indicated by the sensing result is lower than the threshold value, the channel The access mechanism may be a directional LBT. With this configuration, the terminal 20 can set an appropriate channel access mechanism in its own device based on the sensing result.

A claim that further comprises a transmitting unit that transmits the sensing result to another device, and the receiving unit receives an instruction from the other device to set a channel access mechanism determined based on the sensing result. Item 2 The terminal. With this configuration, the terminal 20 can set an appropriate channel access mechanism in its own device based on the sensing result.

Further, according to the embodiment of the present invention, a base station having a receiving unit that executes sensing and a control unit that sets a channel access mechanism based on a comparison between a numerical value indicated by the sensing result and a threshold value. Is provided.

With the above configuration, the base station 10 can set an appropriate channel access mechanism in its own device based on the sensing result. That is, in the wireless communication system, the channel access mechanism can be switched according to the communication environment.

Further, according to the embodiment of the present invention, the terminal executes the receiving procedure for executing the sensing, the control procedure for setting the channel access mechanism based on the comparison between the numerical value indicated by the sensing result and the threshold value. Communication method is provided.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed inventions are not limited to such embodiments, and those skilled in the art will understand various modifications, modifications, alternatives, substitutions, and the like. There will be. Although explanations have been given using specific numerical examples in order to promote understanding of the invention, these numerical values are merely examples and any appropriate value may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in another item. May apply (as long as there is no conflict) to the matters described in. The boundary of the functional part or the processing part in the functional block diagram does not always correspond to the boundary of the physical component. The operation of the plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. As for the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of processing, the base station 10 and the terminal 20 have been described with reference to functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are random access memory (RAM), flash memory, and read-only memory, respectively. It may be stored in (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

Further, the notification of information is not limited to the embodiment / embodiment described in the present disclosure, and may be performed by using another method. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, etc. It may be carried out by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof. RRC signaling may be referred to as an RRC message, for example, RRC. It may be a connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like.

Each aspect / embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), and 5G (5th generation mobile communication). system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)) )), LTE 802.16 (WiMAX®), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other systems that utilize appropriate systems and have been extended based on these. It may be applied to at least one of the next generation systems. Further, 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 specification 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 10 in the present specification may be performed by its upper node (upper node). In a network consisting of one or more network nodes having a base station 10, various operations performed for communication with the terminal 20 are performed by the base station 10 and other network nodes other than the base station 10 ( For example, MME, S-GW, etc. are conceivable, but it is clear that it can be done by at least one of these). In the above example, the case where there is one network node other than the base station 10 is illustrated, but the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). ..

The information, signals, etc. described in the present disclosure 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 and the like may be stored in a specific location (for example, a memory) or may be managed using a management table. Information to be input / output may be overwritten, updated, or added. The output information and the like may be deleted. The input information or the like may be transmitted to another device.

The determination in the present disclosure may be made by a value represented by 1 bit (0 or 1), by a boolean value (Boolean: true or false), or by comparison of numerical values (for example). , Comparison with a predetermined value).

Software, whether called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules. , 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: Digital Subscriber Line), 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.

The terms described 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: Component Carrier) 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.

Further, the information, parameters, etc. described in the present disclosure may be expressed using an absolute value, a relative value from a predetermined value, or another 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 expressly disclosed in this disclosure. Since the 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.

In this disclosure, "base station (BS: Base Station)", "wireless base station", "base station device", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB" (GNB) ”,“ access point ”,“ transmission point ”,“ reception point ”,“ transmission / reception point ”,“ cell ”,“ sector ”, Terms such as "cell group," "carrier," and "component carrier" may 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 (eg, 3) cells. When a base station accommodates multiple cells, the entire base station coverage area can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by (Remote Radio Head). The term "cell" or "sector" is a part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage. Point to.

In the present disclosure, terms such as "mobile station (MS: Mobile Station)", "user terminal", "user device (UE: User Equipment)", 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, a 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 IoT (Internet of Things) device such as a sensor.

Further, the base station in the present disclosure may be read by the user terminal. For example, the communication between the base station and the user terminal is replaced with the communication between a plurality of terminals 20 (for example, it may be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the terminal 20 may have the functions of the base station 10 described above. Further, words such as "up" and "down" may be read as words corresponding to communication between terminals (for example, "side"). For example, the upstream channel, the downstream channel, and the like may be read as a side channel.

Similarly, the user terminal in the present disclosure may be read as a base station. In this case, the base station may have the functions of the above-mentioned user terminal.

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). It may include (eg, searching in a table, database or another data structure), ascertaining 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. It may include (for example, accessing data in memory) to be regarded as "judgment" or "decision". In addition, "judgment" and "decision" are considered to be "judgment" and "decision" when 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.

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. Can be considered to be "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the microwave and light (both visible and invisible) regions.

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

The statement "based on" 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".

Any reference to elements using designations such as "first" and "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. Therefore, references to the first and second elements do not mean that only two elements can be adopted, or that the first element must somehow precede the second element.

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

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

The wireless 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. The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel. Numerology includes, for example, subcarrier interval (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, wireless frame configuration, transmitter / receiver. It may indicate at least one of a specific filtering process performed 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 (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time region. Slots may be time units based on numerology.

The slot may include a plurality of mini slots. Each minislot may be composed of one or more symbols in the time domain. Further, the mini-slot may be referred to as a sub-slot. A minislot may consist of a smaller number of symbols than the slot. The 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 use different names corresponding to each.

For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called TTI, and one slot or one minislot may be called TTI. You may. That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. 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 the LTE system, the base station schedules each terminal 20 to allocate radio resources (frequency bandwidth that can be used in each terminal 20, transmission power, etc.) in TTI units. The definition of TTI is not limited to this.

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 referred to as 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. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, a subslot, a slot, or the like.

The long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (eg, shortened TTI, etc.) may be read as a TTI less than the TTI length of the long TTI and 1 ms. It may be read as 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 the RB may be the same regardless of the 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 the 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 (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), 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 (RE: Resource Element). For example, 1RE may be a radio resource area of 1 subcarrier and 1 symbol.

The bandwidth part (BWP: Bandwidth Part) (which may also be called partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a certain neurology in a carrier. 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.

The BWP may include a BWP for UL (UL BWP) and a 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 radio frame, the number of slots per subframe or radioframe, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP: Cyclic Prefix) length, and other configurations can be changed in various ways.

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

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".

Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used according to the 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.

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 amendments and modifications without departing from the spirit and scope of the present disclosure as determined by the description of the scope of claims. Therefore, the description of this disclosure is for purposes of illustration and does not have any limiting meaning to this disclosure.

10 Base station 110 Transmission unit 120 Reception unit 130 Setting unit 140 Control unit 20 Terminal 210 Transmission unit 220 Reception unit 230 Setting unit 240 Control unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

The receiver that executes sensing and
A terminal having a control unit for setting a channel access mechanism based on a comparison between a numerical value indicated by the sensing result and a threshold value.
The receiving unit executes the sensing by omnidirectional sensing or directional sensing.
The terminal according to claim 1, wherein the early control unit determines the threshold value based on the sensing bandwidth, the sensing directivity, or the sensing periodicity.
When the numerical value indicated by the sensing result is higher than the threshold value, the early control unit sets the channel access mechanism to omnidirectional LBT (Listen before talk), and when the numerical value indicated by the sensing result is lower than the threshold value, the channel The terminal according to claim 2, wherein the access mechanism is a directional LBT.
It further has a transmitter that transmits the sensing result to another device.
The terminal according to claim 2, wherein the receiving unit receives an instruction from the other device to set a channel access mechanism determined based on the result of the sensing.
The receiver that executes sensing and
A base station having a control unit for setting a channel access mechanism based on a comparison between a numerical value indicated by the sensing result and a threshold value.
The receiving procedure to perform sensing and
A communication method in which a terminal executes a control procedure for setting a channel access mechanism based on a comparison between a numerical value indicated by the sensing result and a threshold value.