WO2022003789A1

WO2022003789A1 - Communication device

Info

Publication number: WO2022003789A1
Application number: PCT/JP2020/025561
Authority: WO
Inventors: 尚哉芝池; 浩樹原田; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2022-01-06
Also published as: JPWO2022003789A1

Abstract

This communication device is provided with a control unit that executes a channel access procedure in an unlicensed frequency band including a first frequency band and a second frequency band higher than the first frequency band. When a first condition is satisfied in the channel access procedure for the first frequency band, the control unit allows application of a first process for executing carrier sense at a predetermined timing in a fixed frame period. When a second condition is satisfied in the channel access procedure for the second frequency band, the control unit executes a second process for executing carrier sense at a predetermined timing in a fixed frame period.

Description

Communication device

The present disclosure relates to a communication device that executes wireless communication, particularly a communication device that executes a process of executing carrier sense before starting transmission.

The 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and next-generation specifications called Beyond 5G, 5G Evolution or 6G. We are also proceeding with the conversion.

In 3GPP Release 15 and Release 16 (NR), the operation of multiple frequency ranges, specifically, the band including FR1 (410MHz-7.125GHz) and FR2 (24.25GHz-52.6GHz) is specified. ..

Also, studies are underway on NR that supports up to 71 GHz, exceeding 52.6 GHz (Non-Patent Document 1). In addition, Beyond 5G, 5G Evolution or 6G (Release-18 or later) aims to support frequency bands above 71GHz.

By the way, in the unlicensed frequency band, the process of executing carrier sense (hereinafter, LBT; Listen Before Talk) is applied before starting transmission. Examples of such LBT include LBE (Load Based Equipment) processing and FBE (Frame Based Equipment) processing. In the LBE process, carrier sense is executed until a carrier that does not interfere with other communication devices is found according to the demand. In the FBE process, carrier sense is executed at a predetermined timing in a fixed frame period. For example, FBE processing is applied when the absence of a method other than the communication method specified by 3GPP (for example, WiFi) is guaranteed.

Under such a background, the possibility of applying FBE processing in the high frequency band exceeding 52.6 GHz has not been examined. As a result of diligent studies, the inventors have found the usefulness of applying the FBE processing in the second frequency band higher than the first frequency band (for example, a high frequency band exceeding 52.6 GHz).

Therefore, the following disclosure has been made in view of such a situation, and an object thereof is to provide a communication device capable of appropriately applying FBE processing in a second frequency band higher than the first frequency band. And.

One aspect of the present disclosure is a communication device comprising a control unit that executes a channel access procedure in an unlicensed frequency band including a first frequency band and a second frequency band higher than the first frequency band. The unit permits the application of the first process of executing carrier sense at a predetermined timing in a fixed frame period when the first condition is satisfied in the channel access procedure of the first frequency band. The gist of the channel access procedure in the second frequency band is to execute a second process of executing carrier sense at a predetermined timing in a fixed frame period when the second condition is satisfied.

FIG. 1 is an overall schematic configuration diagram of the wireless communication system 10. FIG. 2 is a diagram showing a frequency range used in the wireless communication system 10. FIG. 3 is a diagram showing a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10. FIG. 4 is a functional block configuration diagram of the communication device 300. FIG. 5 is a diagram for explaining a channel access procedure. FIG. 6 is a sequence diagram showing an operation example. FIG. 7 is a sequence diagram showing an operation example. FIG. 8 is a diagram for explaining the channel access procedure according to the first modification. FIG. 9 is a sequence diagram showing an operation example according to the modification example 3. FIG. 10 is a diagram showing an example of the hardware configuration of the communication device 300.

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

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

The wireless communication system 10 may be a wireless communication system according to a method called Beyond 5G, 5G Evolution or 6G.

NG-RAN20 includes a radio base station 100A (hereinafter, gNB100A) and a radio base station 100B (hereinafter, gNB100B). The specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG.

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

GNB100A and gNB100B are radio base stations according to 5G, and execute wireless communication according to UE200 and 5G. The gNB100A, gNB100B and UE200 are Massive MIMO (Multiple-Input Multiple-Output) and multiple component carriers (CC) that generate beam BM with higher directivity by controlling radio signals transmitted from multiple antenna elements. ) Can be bundled and used, and dual connectivity (DC) that communicates with two or more transport blocks at the same time between the UE and each of the two NG-RAN Nodes.

In addition, the wireless communication system 10 supports a plurality of frequency ranges (FR). FIG. 2 shows the frequency range used in the wireless communication system 10.

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

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

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

Furthermore, the wireless communication system 10 also supports a higher frequency band than the FR2 frequency band. Specifically, the wireless communication system 10 corresponds to a frequency band exceeding 52.6 GHz and up to 114.25 GHz. Such a high frequency band may be referred to as "FR2x" for convenience.

To solve this problem, when using a band exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-) with a larger Sub-Carrier Spacing (SCS) S-OFDM) may be applied.

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

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

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

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

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

The band for LBT (LBT sub-band) in NR-U can be provided in the unlicensed frequency band Fu, and may be expressed as a band for confirming the presence or absence of use in the unlicensed frequency band Fu. The LBT sub-band may be, for example, 20 MHz, half 10 MHz, or 1/4 5 MHz.

In the embodiment, the unlicensed frequency band Fu includes a first frequency band (for example, 2.4 GHz band or 5.0 GHz band) and a second frequency band higher than the first frequency band (for example, 60 GHz band). The first frequency band may be included in FR1. The second frequency band may be included in FR2x. The unlicensed frequency band Fu shown in FIG. 2 is only an example.

FIG. 3 shows a configuration example of a wireless frame, a subframe, and a slot used in the wireless communication system 10.

As shown in FIG. 3, one slot is composed of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the interval (frequency) shown in FIG. For example, 480 kHz, 960 kHz, etc. may be used.

Further, the number of symbols constituting one slot does not necessarily have to be 14 symbols (for example, 28, 56 symbols). In addition, the number of slots per subframe may vary from SCS to SCS.

The time direction (t) shown in FIG. 3 may be referred to as a time domain, a symbol period, a symbol time, or the like. Further, the frequency direction may be referred to as a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP: BandwidthPart), or the like.

(2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of the communication device 300 will be described. The communication device 300 may be gNB100 or UE200. As shown in FIG. 4, the communication device 300 includes a communication unit 310 and a control unit 320.

The communication unit 310 communicates using the licensed frequency band. Communication using the licensed frequency band includes communication using the channel specified by 3GPP. Channels include control channels and data channels.

Control channels include DCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel), Random Access Radio Network Temporary Identifier (RA-RNTI), Downlink Control Information (DCI), and Physical. Includes Broadcast Channel (PBCH), etc.

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

Communication unit 310 communicates using the unlicensed frequency band Fu. As described above, the unlicensed frequency band Fu includes a first frequency band and a second frequency band higher than the first frequency band. Communication using the unlicensed frequency band Fu may be used in combination with communication using the licensed frequency band. That is, carriers in the licensed frequency band and carriers in the unlicensed frequency band Fu may be bundled. Such a technique may be referred to as LAA (Licensed-Assisted Access).

The control unit 320 controls the communication device 300. In the embodiment, the control unit 320 executes the channel access procedure in the unlicensed frequency band Fu. The channel access procedure includes a process of executing carrier sense (hereinafter, LBT; Listen Before Talk) before starting transmission. Examples of LBT include LBE (Load Based Equipment) processing and FBE (Frame Based Equipment) processing. In the LBE process, carrier sense is executed until a carrier that does not interfere with other communication devices is found according to the demand. In the FBE process, carrier sense is executed at a predetermined timing in a fixed frame period.

Here, the control unit 320 applies the first process of executing the carrier sense at a predetermined timing in a fixed frame period when the first condition is satisfied in the channel access procedure of the first frequency band. Tolerate. The first process is an example of FBE process. The first condition is that it is guaranteed that there is no other technology (for example, WiFi) different from the wireless communication system 10 in the first frequency band. The control unit 320 may execute the LBE process instead of the FBE process even when the first condition is satisfied.

On the other hand, the control unit 320 executes a second process of executing carrier sense at a predetermined timing in a fixed frame period when the second condition is satisfied in the channel access procedure of the second frequency band. .. The second process is an example of the FBE process. The second condition is different from the first condition. For example, as the second condition, the following conditions can be considered.

First, the second condition may be that it is predetermined to apply the FBE process as the channel access procedure of the second frequency band. For example, the second condition may be that a standard such as 3GPP stipulates that FBE processing is applied as a channel access procedure for the second frequency band. That is, as the channel access procedure of the second frequency band, the FBE processing may be applied without applying the LBE processing.

Secondly, the second condition may be that it has been confirmed that there is no other technology (for example, WiFi) different from the wireless communication system 10 in the second frequency band. Here, the "confirmation" of the second condition is a concept different from the "guarantee" of the first condition, and may be a concept including a small influence of other technologies. The second condition may be that it is notified that no other technique exists in the second frequency band. Such a notification may be executed by gNB100 or by a higher-level node of gNB100 (for example, OAM; Operation Administration and Maintenance).

Thirdly, the second condition may be set to apply the FBE process as the channel access procedure of the second frequency band. The application of FBE processing may be set in SIM, may be set by MACCE, or may be set by RRC.

(3) Channel access procedure Next, the channel access procedure will be described. Here, the above-mentioned FBE processing will be described.

As shown in FIG. 5, in FBE processing, a fixed frame period (FFP; Fixed Frame Period) is defined. For example, the possible values of FFP are 1ms, 2ms, 2.5ms, 4ms, 5ms, and 10ms. In the FBE process, the carrier sense is executed at a predetermined timing. The predetermined timing includes at least the timing immediately before FFP. The predetermined timing may include the timing immediately before the channel occupancy time (hereinafter, COT; Channel Occupancy Time).

Type2A, Type2B, and Type2C can be considered as the channel access procedure used in FBE processing. Type 2A is a process in which the time interval (hereinafter referred to as gap) between another transmission and the target transmission is 25 μs. Type 2B is a process in which the gap between another transmission and the target transmission is 16 μs. Type 2C is a process in which the gap between another transmission and the target transmission is shorter than 16 μs. Type 2A and Type 2B are processes that execute channel cess in gap. Type2C is a process that does not execute channel sense in gap. For example, Type 2C is used for COT sharing between gNB100 and UE200 (for example, 3GPP TS37.213 V16.1.0 §4.1.2 “Type2DLChannelaccessprocedure” and §4.2.1.2 “Type2ULchannel”. access procedure ”).

For example, "A" shown in FIG. 5 shows a case where the LBT Idle is confirmed by the carrier sense of Type 2A or Type 2B and the downlink (DL) is transmitted. In "B" shown in FIG. 5, the case where the LBT Idle is confirmed by the carrier sense of Type 2C and the uplink (UL) is transmitted is shown. “C” and “D” shown in FIG. 5 indicate a case where LBT Idle is confirmed by the carrier sense of Type 2A or Type 2B, and downlink (DL) and uplink (UL) transmission is executed. There is. LBT Idle means that the channel is not occupied by another communication device 300. MCOT is the maximum value of channel occupancy time.

“E” shown in FIG. 5 shows a case where LBT Busy is confirmed by the carrier sense of Type 2A or Type 2B, and downlink (DL) and uplink (UL) transmission is executed. Note that LBT Busy means that the channel is occupied by another communication device 300.

In "F" shown in FIG. 5, the case where the LBT Idle is confirmed by the carrier sense of Type 2A or Type 2B and the downlink (DL) is transmitted is shown. “G” shown in FIG. 5 shows a case where uplink (UL) transmission is executed without performing carrier sense by sharing COT.

Here, the content of the second process, which is the FBE process applied in the second frequency band (for example, 60 GHz band), is the content of the first process, which is the FBE process applied in the first frequency band (for example, the 5 GHz band). It may be the same as the content. For example, in the second process, the same FFP as the FFP used in the first process may be used. That is, the communication device 300 (control unit 320) may use the same FFP as the FFP of the first process in the second process.

(4) Operation example An operation example of the channel access procedure for the second frequency band will be described below. Here, NG-RAN20 (gNB200) executes the carrier sense of FBE processing (Type 2A or Type 2B) before DL transmission, and UE200 executes the carrier sense of FBE processing (Type 2A or Type 2B) before UL transmission. I will explain the case to do.

First, a case where it is predetermined to apply FBE processing as a channel access procedure for the second frequency band will be described.

As shown in FIG. 6, in step S10, NG-RAN20 executes carrier sense at a predetermined timing in FFP.

In step S11, NG-RAN20 executes DL transmission when the result of carrier sense is LBT Idle. The NG-RAN20 does not execute DL transmission when the result of carrier sense is LBT Busy.

In step S12, UE200 executes carrier sense at a predetermined timing in FFP.

In step S13, UE200 executes UL transmission when the result of carrier sense is LBT Idle. The UE200 does not execute UL transmission when the result of carrier sense is LBT Busy.

FIG. 6 illustrates a case in which it is predetermined to apply FBE processing as a channel access procedure for the second frequency band. However, the sequence shown in FIG. 6 may be applied to cases where it has been confirmed that no other technique exists in the second frequency band. The sequence shown in FIG. 6 may be applied to the case where it is notified that no other technique exists in the second frequency band.

Second, a case where it is set to apply FBE processing as a channel access procedure for the second frequency band will be described. In FIG. 7, since the same step numbers are assigned to the same processes as those in FIG. 6, the description of the same processes as in FIG. 6 will be omitted.

As shown in FIG. 7, in step S20, the NG-RAN20 transmits a setting to apply the FBE process as the channel access procedure of the second frequency band to the UE200.

FIG. 7 illustrates a case where FBE processing is applied. However, the sequence shown in FIG. 7 may be applied to cases where LBE processing is applied. In such a case, in step S20, the NG-RAN20 transmits to the UE200 a setting to apply the LBE process as the channel access procedure of the second frequency band. In steps S10 and S12, carrier sense based on LBE processing may be performed. The carrier sense based on the LBE processing may be referred to as Type 1 (for example, 3GPP TS37.213 V16.1.0 §4.1.1 “Type1DLChannelaccessprocedure” and §4.2.1.1 “Type1ULchannel”. access procedure ”).

(5) Actions and effects In the first frequency band, there is a high possibility that other technologies (for example, WiFi compliant with IEEE802.11a / g / n) different from the wireless communication system 10 will coexist. On the other hand, in the second frequency band, we are paying attention to new findings that are unlikely to coexist with other technologies (for example, WiFi compliant with IEEE802.11ad / ay) different from the wireless communication system 10. Based on such new knowledge, the communication device 300 is the first condition to apply the FBE processing in the first frequency band in the second frequency band higher than the first frequency band in the unlicensed frequency band Fu. The FBE process is executed when the second condition different from the above is satisfied. According to such a configuration, the FBE process can be appropriately applied in the second frequency band higher than the first frequency band.

[Change example 1]
Hereinafter, modification 1 of the embodiment will be described. The differences from the embodiments will be described below.

In the embodiment, the content of the second process, which is the FBE process applied in the second frequency band (for example, 60 GHz band), is the first process, which is the FBE process applied in the first frequency band (for example, the 5 GHz band). It may be the same as the content of. On the other hand, in the first modification, the content of the second process, which is the FBE process applied in the second frequency band, is different from the content of the first process, which is the FBE process applied in the first frequency band. For example, in the second process, an FFP shorter than the FFP used in the first process may be used.

Specifically, as shown in FIG. 8, the FFP of the second process applied in the second frequency band (lower part of FIG. 8) is the FFP of the first process applied in the first frequency band (FIG. 8). Shorter than the upper). For example, the possible values of FFP in the first process may be 1 ms, 2 ms, 2.5 ms, 4 ms, 5 ms, and 10 ms. On the other hand, the possible values of FFP in the second process may be 0.5 ms, 1 ms, 1.25 ms, 2 ms, 2.5 ms, and 5 ms.

As described above, the communication device 300 (control unit 320) may use an FFP shorter than the FFP of the first process in the second process.

In such a case, the FFP used in the second process may be predetermined. Alternatively, as the FFP used in the second process, a value obtained by scaling the FFP used in the first process by the scaling factor α may be used. The scaling factor α may be a predetermined value, a value set in SIM, a value set by MAC CE or RRC, and a value associated with SCS. May be.

In change example 1, attention was paid to the fact that the SCS of the second frequency band is wider (larger) than the SCS of the first frequency band. Based on such attention, early channel access can be realized by making the FFP used in the second frequency band shorter than the FFP used in the first frequency band.

[Change example 2]
Hereinafter, modification 2 of the embodiment will be described. The differences from the embodiments will be described below.

In the second modification, the communication device 300 executes carrier sense on a frequency (for example, LBT sub-band) basis in the first process applied in the first frequency band. On the other hand, the communication device 300 may execute carrier sense on a beam basis in the second process applied in the second frequency band.

In modification 2, the second frequency band, which is higher than the first frequency band, is narrower by using a massive antenna having a large number of antenna elements in order to cope with a wide bandwidth and a large propagation loss. We focused on the need to generate a beam. By executing carrier sense on a beam basis based on such attention, CCA (Clear Channel Assessment) along with an actual transmission beam can be realized. Furthermore, interference with other communication devices 300 can be suppressed, and many transmission opportunities can be obtained.

[Change example 3]
Hereinafter, modification 3 of the embodiment will be described. The differences from the embodiments will be described below.

The second condition includes the condition that the UE 200 that can configure the communication device 300 has the ability to execute the second process. In such a case, the UE 200 transmits an information element indicating whether or not it has the ability to execute the second process to the NG-RAN 20 (gNB100) as an information element included in the UE Capability.

For example, as shown in FIG. 9, in step S30, the UE 200 transmits a Capability to the effect that it has the ability to execute the second process to the NG-RAN 20. In FIG. 9, since the same step numbers are assigned to the same processes as those in FIG. 6, the description of the same processes as in FIG. 6 will be omitted.

FIG. 9 illustrates a case where the UE 200 has the ability to execute the second process. However, the sequence shown in FIG. 9 may be applied to cases where the UE 200 does not have the ability to perform a second process. In such a case, in step S30, the UE 200 transmits a Capability to the NG-RAN 20 to the effect that it does not have the ability to execute the second process. When the notification or setting to apply the second processing (FBE processing) is performed in the second frequency band, and the UE200 does not have the ability to execute the second processing, the second frequency band is used. It is not necessary to perform communication using.

Change example 3 illustrates a case where the ability of UE200 to execute the second process is an optional feature. However, the ability of UE200 to perform a second process may be a feature of the mandatory. In such a case, the process of S30 shown in FIG. 9 may be omitted.

[Other embodiments]
Although the contents of the present invention have been described above according to the embodiments, it is obvious to those skilled in the art that the present invention is not limited to these descriptions and can be modified and improved in various ways.

In the embodiment, the case where the FBE processing is applied in the channel access procedure of the second frequency band higher than the first frequency band has been mainly described. However, the embodiments are not limited to this. For example, there are cases where it has not been confirmed that there is no other technology in the second frequency band, cases where it has not been notified that there is no other technology in the second frequency band, and FBE as a channel access procedure for the second frequency band. In cases where it is not set to apply processing, processing other than FBE processing may be applied in the channel access procedure for two frequency bands. The process other than the FBE process may include an LBE process or may include an ATPC (Automatic Transmission Power Control).

The block configuration diagram (FIG. 4) used in the description of the above-described 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.

Further, the above-mentioned communication device 300 (the device) may function as a computer that processes the wireless communication method of the present disclosure. FIG. 10 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 10, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

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

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

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

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) including an interface with peripheral devices, a control device, an arithmetic unit, a register, and the like.

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

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

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

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

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

The input device 1005 is an input device (for example, 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).

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

Furthermore, the device includes hardware such as a microprocessor, a digital signal processor (Digital Signal Processor: DSP), ApplicationSpecific IntegratedCircuit (ASIC), ProgrammableLogicDevice (PLD), and FieldProgrammableGateArray (FPGA). The hardware may implement some or all of each functional block. For example, processor 1001 may be implemented using at least one of these hardware.

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

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

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

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

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

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

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

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

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

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

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

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) 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 absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, the radio resource may be one indicated by an index.

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

In this disclosure, "Base Station (BS)", "Wireless Base Station", "Fixed Station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", " "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "cell group", " Terms such as "carrier" and "component carrier" 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 (for example, three) cells (also called sectors). 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 remote radio for indoor use). Communication services can also be provided by Head: RRH).

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

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

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

At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on the mobile body, 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 Internet of Things (IoT) device such as a sensor.

Further, the base station in the present disclosure may be read as a mobile station (user terminal, the same shall apply hereinafter). For example, communication between a base station and a mobile station has been replaced with communication between a plurality of mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Each aspect / embodiment of the present disclosure may be applied to the configuration. In this case, the mobile station may have the functions of the base station. 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 mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions of the mobile station.

The 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 be further 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 Spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval: TTI), number of symbols per TTI, wireless frame configuration, transmission / reception. It may indicate at least one of a specific filtering process performed by the machine in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like.

The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. The slot may be a unit of time 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. The minislot may consist of a smaller number of symbols than the slot. PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (or PUSCH) mapping type B.

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

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

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

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.

TTI with a time length of 1 ms may be called normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. 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, and the like.

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

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

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

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

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

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

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

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

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

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

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

Any reference to elements using designations such as "first" 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 there, or that the first element must somehow precede the second element.

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

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

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.

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

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure may be implemented as 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 Radio communication system 20 NG-RAN
100 gNB
200 UE
300 Communication device 310 Communication unit 320 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

A control unit that executes a channel access procedure in an unlicensed frequency band including a first frequency band and a second frequency band higher than the first frequency band is provided.
The control unit
In the channel access procedure of the first frequency band, when the first condition is satisfied, the application of the first process of executing carrier sense at a predetermined timing in a fixed frame period is permitted.
A communication device that executes a second process of executing carrier sense at a predetermined timing in a fixed frame period when the second condition is satisfied in the channel access procedure of the second frequency band.
The communication device according to claim 1, wherein the control unit uses the same fixed frame period as the fixed frame period used in the first process in the second process.
The communication device according to claim 1, wherein the control unit uses a fixed frame period shorter than the fixed frame period used in the first process in the second process.
The communication device according to any one of claims 1 to 3, wherein the control unit executes the carrier sense on a beam basis in the second process.
The communication device according to any one of claims 1 to 4, wherein the second condition includes a condition that a terminal capable of constituting the communication device has an ability to execute the second process.