WO2020003470A1

WO2020003470A1 - Transmission device and reception device

Info

Publication number: WO2020003470A1
Application number: PCT/JP2018/024724
Authority: WO
Inventors: 大輔村山; 浩樹原田; 和晃武田; 聡永田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-06-28
Filing date: 2018-06-28
Publication date: 2020-01-02

Abstract

To improve the efficiency with which wireless resources are used over future LAA systems, one embodiment of this transmission device has: a transmission unit that transmits a first signal at a transmission opportunity that is based on the results of first listening; and a control unit that, during the period of the transmission opportunity that follows transmission of the first signal, performs control such that a preamble pattern that does not require demodulation is used to give notification of information that indicates the results of second listening.

Description

Transmitter and receiver

<< The present invention relates to a transmitting device and a receiving device in a next-generation mobile communication system.

In an existing LTE system (for example, Rel. 8-12), a frequency band (licensed @ band), licensed carrier (licensed @ carrier), licensed component carrier (CC) licensed to a communication carrier (operator) is used. Etc.) have been specified on the assumption that exclusive operation is performed. As the licensed CC, for example, 800 MHz, 1.7 GHz, 2 GHz, or the like is used.

Also, in the existing LTE system (for example, Rel. 13), in order to extend the frequency band, a frequency band different from the licensed band (unlicensed band (unlicensed @ band), unlicensed carrier (unlicensed @ carrier), unlicensed (Also called CC) is supported. As the unlicensed band, for example, a 2.4 GHz band or a 5 GHz band in which Wi-Fi (registered trademark) or Bluetooth (registered trademark) can be used is assumed.

Specifically, Rel. In 13, carrier aggregation (CA: Carrier @ Aggregation) for integrating a licensed band carrier (CC) and an unlicensed band carrier (CC) is supported. Thus, communication performed using the unlicensed band together with the licensed band is called LAA (License-Assisted @ Access) (Non-Patent Document 1).

利用 The use of LAA is also being considered for future wireless communication systems (for example, 5G, 5G +, NR, Rel. 15 or later). In the future, LAA may be considered for dual connectivity (DC: Dual @ Connectivity) between licensed and unlicensed bands and stand-alone (SA: Stand-Alone) for unlicensed bands.

In the LAA system, a transmitting device (for example, a base station in the downlink and a user terminal in the uplink) performs listening before confirming the presence or absence of signal transmission by another device before transmitting data in the unlicensed band. Such listening is referred to as LBT (Listen Before Talk), CCA (Clear Channel Assessment), carrier sense or channel access operation (channel access procedure), and the like.

When the transmitting device detects an idle state in which no signal is transmitted by another device as a result of listening, the transmitting device starts data transmission after a predetermined period (immediately after or during a back-off period).

However, as a result of listening, even if an idle state is detected and a transmission opportunity is acquired, another device may transmit data at this transmission opportunity. In this case, radio resource loss may occur due to signal collision, and radio resource utilization efficiency may be reduced.

The present invention has been made in view of the above, and an object of the present invention is to provide a transmitting device and a receiving device that can improve the use efficiency of radio resources in a future LAA system.

One aspect of the transmission device of the present invention is a transmission unit that transmits a first signal at a transmission opportunity based on a result of the first listening, and a period after the transmission of the first signal among the transmission opportunities. And a control unit for controlling information indicating the result to be notified in a preamble pattern that does not require demodulation.

According to the present invention, it is possible to improve the use efficiency of radio resources in a future LAA system.

It is a figure which shows an example of CSMA / CA @ with @ ACK. It is a figure showing an example of data collision by a hidden terminal. It is a figure which shows an example of CSMA / CA @ with @ RTS / CTS. It is a figure showing an example of RTS / CTS in a future LAA system. 5A and 5B are diagrams illustrating an example of the operation of a plurality of nodes in COT sharing. 6A and 6B are diagrams illustrating an example of the operation of a plurality of nodes in the COT sharing according to the method 1. 7A and 7B are diagrams illustrating an example of operation of a plurality of nodes in COT sharing according to method 1. FIG. 11 is a diagram illustrating an example of operation of a plurality of nodes in COT sharing according to method 2. 1 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to the present embodiment. FIG. 3 is a diagram illustrating an example of a functional configuration of a base station according to the present embodiment. FIG. 3 is a diagram illustrating an example of a functional configuration of a baseband signal processing unit of a base station. FIG. 3 is a diagram illustrating an example of a functional configuration of a user terminal according to the present embodiment. FIG. 3 is a diagram illustrating an example of a functional configuration of a baseband signal processing unit of a user terminal. FIG. 2 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment of the present invention.

In an unlicensed band, for example, coexistence of a plurality of systems such as a Wi-Fi system and an LAA system is assumed. Therefore, an access control method for avoiding collision of data transmission between the plurality of systems is required.

In a Wi-Fi system using an unlicensed band, an access method called CSMA / CA (Carrier Sense Multiple Access / Collision Avoidance) is adopted as the LBT method.

FIG. 1 is a diagram showing an example of CSMA / CA. As shown in FIG. 1, the terminal C (data transmitting side) checks a signal on the communication medium (carrier sense), and does not immediately start data transmission even if it determines that there is no signal, and waits for a random time. Then send the data. This waiting time is called DIFS (Distributed \ Inter \ Frame \ Space). The access point B (data receiving side) receiving the data returns an acknowledgment (ACK: Acknowledgement). In order to allow transmission of ACK with priority, ACK can be transmitted only by waiting for a shorter time (SIFS: Short @ IFS) than DIFS. Terminal C (data transmitting side) repeats retransmission until ACK is received. For this reason, the access scheme shown in FIG. 1 is also called CSMA / CA @ with @ ACK.

Terminal A (data transmission side) waits for transmission because another terminal (terminal C) is transmitting a signal when examining a signal on the communication medium. After the ongoing transmission operation is completed, that is, after receiving the ACK, the data transmission starts after the elapse of the DIFS and the backoff period.

FIG. 2 is a diagram showing an example of data collision by a hidden terminal. In FIG. 2, even when data is transmitted from the terminal C to the access point B, the radio wave from the terminal C does not reach the terminal A. Therefore, terminal A cannot recognize that terminal C is transmitting data even if carrier sense is performed. When terminal A transmits data in this state, transmission signals from terminal A and terminal C collide at access point B, and data transmission by terminal C fails. This is called the "hidden terminal problem".

アクセス To avoid this hidden terminal problem, an access method called RTS / CTS has been introduced. This is a mechanism in which an RTS is transmitted as a transmission request before a terminal on the data transmitting side starts data transmission, and a terminal on the data receiving side receives this and transmits a CTS, thereby giving transmission permission. The RTS includes time required for data transmission, and the CTS includes time during which data transmission is permitted. Therefore, other terminals that have received the RTS / CTS do not perform the transmission operation during that period, thereby avoiding collision of transmission signals. This period is called a transmission prohibition period (NAV: Network @ Allocation @ Vector). An access method using RTS / CTS is also called CSMA / CA @ with @ RTS / CTS.

FIG. 3 is a diagram showing an example of CSMA / CA {with} RTS / CTS. As shown in FIG. 3, the terminal C (data transmitting side) checks a signal on the communication medium (carrier sense), confirms that there is no signal, and transmits an RTS after a waiting time (DIFS). The access point B (data receiving side) that has received the RTS transmits a CTS after a waiting time (SIFS). The terminal C that has received the CTS transmits data after a waiting time (SIFS). The access point B receiving the data returns an ACK after a waiting time (SIFS).

(4) All terminals in the radio wave range of terminal C and access point B are notified by RTS / CTS that communication will be performed. Other terminals that have detected RTS / CTS wait for transmission during the transmission prohibition period (NAV), so that they do not interfere with data transmission. In the example shown in FIG. 2, the RTS transmitted by the terminal C does not reach the terminal A. However, since the CTS transmitted from the access point B reaches the terminal A, the terminal A recognizes that communication is performed and waits for transmission. Therefore, the hidden terminal problem is avoided.

FIG. 4 is a diagram showing an example of an RTS / CTS type access method in a future LAA system. In FIG. 4, the data transmitting side (transmitting device) is a base station, and the data receiving side (receiving device) is a user terminal. The base station transmits RTS as a transmission request before starting data transmission, and the user terminal receives this RTS and transmits CTS as transmission permission. In the second access method, the RTS transmitted by the transmitting device may be a message corresponding to the RTS. The CTS received by the transmitting device may be a message corresponding to the CTS.

In an RTS / CTS type access scheme, both the RTS and the CTS may be transmitted on an unlicensed band carrier. The RTS and CTS may be transmitted (omni transmission) to the entire cell of the unlicensed CC, or may be transmitted by beamforming in a predetermined direction. The RTS and / or CTS may be a format conforming to the RTS of the Wi-Fi system or IEEE 802.11, or a format unique to the LAA system. The carrier of the unlicensed band may be called an unlicensed carrier, unlicensed CC, LAA @ SCell (Secondary @ Cell), or the like.

In the RTS / CTS type access scheme, one of RTS and CTS may be transmitted on an unlicensed band carrier, and the other may be transmitted on a licensed band carrier. Instead of the uplink unlicensed CC, an unlicensed CC of TDD (Time Division Duplex, unpaired spectrum) may be used.

In the RTS / CTS type access method, even if both RTS and CTS are transmitted on the unlicensed band carrier, or if either one is transmitted on the unlicensed band carrier, before the first transmission on the unlicensed band, Listening (for example, LBT) is performed. At the time of transmission after the initial transmission in the unlicensed band, if the transmission is started within a predetermined time (for example, SIFS) from the previous transmission, the listening may be omitted or the listening may be short.

In the RTS / CTS type access scheme, the carrier transmitting the RTS and CTS may be switched dynamically or semi-statically.

<COT sharing>
In a future LAA system, a time of a transmission opportunity (TxOP: Transmission Opportunity) acquired by a base station (gNB) or a user terminal, that is, a channel occupancy period (COT: Channel Occupancy Time) may be distributed (shared) to a plurality of nodes. Is being considered. The node may be either a user terminal or a base station, or may be a node of another system.

One-to-one communication of downlink and uplink can be assumed as a basic form of COT sharing. For example, one-to-one communication between node A and node B can be assumed. Alternatively, as a form of COT sharing, one-to-many communication of downlink and uplink may be assumed.

FIG. 5 is a diagram illustrating an example of COT sharing in an unlicensed CC. If the node A performs LBT on the unlicensed CC and the LBT result is idle, the node A acquires a transmission opportunity (TxOP) having a COT time length. In this case, the node A performs data transmission in the unlicensed CC. An LBT performed immediately before transmission opportunity (TxOP) acquisition is also referred to as an initial LBT (I-LBT: Initial @ LBT). Of the transmission opportunity (TxOP) acquired by the node A, the remaining period of the transmission by the node A may be distributed to other nodes that can receive the signal from the node A.

In COT sharing, when the transmission device is switched from node A to another node (for example, node B), a blank period (gap) of transmission occurs. If the gap length is 16 [μs] or less (or less than 16 [μs]), no-LBT transmission that does not require LBT before transmission may be allowed within the transmission period (TxOP). When the gap length is larger than 16 [μs] (or 16 [μs] or more), LBT transmission may be performed within the transmission period (TxOP). LBT transmission refers to data transmission that requires an LBT before transmission and that transmits data when the LBT result is idle. Even when the gap length is 16 [μs] or less, LBT transmission may be performed within the transmission period (TxOP).

In order to realize a gap length (for example, 16 [μs] or less) in which No-LBT transmission is allowed, it is preferable to schedule some data transmissions in a transmission period (TxOP) in advance. For example, when node A is a base station and node B and node C are user terminals, when data transmission is performed by node A, downlink control information indicating scheduling (allocation) of data transmission of node B and node C is transmitted. You may send it. Alternatively, information indicating the scheduling of data transmission by the nodes A, B, and C may be transmitted before the transmission opportunity (TxOP).

例 In the example shown in FIG. 5A, the gap length is 16 [μs] or less. When the data transmission by the node A is completed within the transmission opportunity (TxOP) acquired by the node A, the node B performs the no-LBT transmission with a gap therebetween. When the data transmission by the node B is completed, the node C performs no-LBT transmission with a gap therebetween.

例 In the example shown in FIG. 5B, the gap length is larger than 16 [μs]. When the data transmission by the node A ends within the transmission opportunity (TxOP) acquired by the node A, the node B performs the LBT transmission with a gap therebetween. When the data transmission by the node B is completed, the node C performs the LBT transmission with a gap therebetween.

The following four categories are defined for LBT in {LTE} LAA.

Category 1: Transmit without performing LBT.
Category 2: Carrier sensing is performed at a fixed sensing time before transmission, and transmission is performed when a channel is free.
Category 3: Before transmission, randomly generate a value (random backoff) from within a predetermined range, repeat carrier sense in a fixed sensing slot time, and confirm that the channel is vacant over the slot of the value. If sent.
Category 4: Before transmission, a value (random backoff) is randomly generated from within a predetermined range, carrier sense is repeatedly performed in a fixed sensing slot time, and it can be confirmed that a channel is vacant over the slot of the value. If sent. The range of the random backoff value (contention window size) changes according to the communication failure situation due to collision with communication of another system.

初期 As an initial LBT (I-LBT) in a future LAA system, an LBT in a receiver-assisted LBT or an LTE-LAA may be performed. In this case, it is preferable that the LTE of LTE @ LAA is category 4.

The LBT performed in the transmission period (TxOP) may be a one-shot LBT for performing carrier sensing for a short fixed time, or may be an LBT in LTE LAA. One-shot LBT is also called short LBT. If the cap is 16 [μs] or less, no-LBT transmission may be performed.

In COT sharing, while a node (for example, node A) that has acquired a transmission opportunity (TxOP) after initial LBT (I-LBT) is performing data transmission, node A that is transmitting a signal due to factors such as a hidden terminal or the like. May be affected. In this case, a node that receives a signal transmitted from node A (for example, node B or node C) cannot detect that node A is receiving interference. Therefore, when the LBT result is idle, the node B or the node C starts data transmission to the node A. Alternatively, the node B or the node C starts data transmission addressed to the node A without performing LBT (no-LBT transmission). However, since node A is busy, it cannot receive data transmitted from node B or node C.

ため In order to solve this problem, it is conceivable that the LBT performed within the transmission opportunity (TxOP) is a receiver auxiliary LBT. However, when the receiver-assisted LBT is used, the overhead increases, and there is a possibility that switching of the transmission source (transmission device) frequently occurs. When the transmission source is switched within a certain transmission period (TxOP), a blank period (gap) occurs. The gap is not only an overhead, but may be detected as an idle state by other surrounding systems, and may cause the other system to start communication first, thereby increasing a possibility of losing a transmission opportunity.

Therefore, the present inventors have found a means for speeding up signal processing in a frame for notifying an LBT result and suppressing a blank period (gap) occurring in a transmission opportunity (TxOP).

Hereinafter, the present embodiment will be described in detail with reference to the accompanying drawings.

In the present embodiment, the unlicensed CC is a carrier (cell, CC) in the first frequency band, a carrier (cell, CC) in the unlicensed band, LAA @ SCell, an LAA cell, a secondary cell (SCell), or the like. May be read as The licensed CC may be read as a carrier (cell, CC) of the second frequency band, a carrier (cell, CC) of the licensed band, PCell (Primary @ Cell), SCell, or the like.

において In the present embodiment, the unlicensed CC may be LTE-based or NR-based (NR unlicensed CC). The licensed CC may be LTE-based or NR-based. In the LAA system (wireless communication system) of the present embodiment, the unlicensed CC and the licensed CC may be subjected to carrier aggregation (CA) or dual connectivity (DC) in either LTE or NR system ( (Stand-alone), carrier aggregation (CA) or dual connectivity (DC) between LTE and NR systems (non-stand-alone).

Future LAA systems may be referred to as NR-U (Unlicensed) systems. The LAA system may be compliant (supported) with a first wireless communication standard (eg, NR, LTE, etc.).

Other systems (coexistence systems, coexistence devices) and other wireless communication devices (coexistence devices) that coexist with this LAA system are Wi-Fi (registered trademark), Bluetooth (registered trademark), WiGig (Wireless @ Gigabit) (registered trademark). ), A wireless LAN (Local Area Network), IEEE802.11, or another second wireless communication standard different from the first wireless communication standard. The coexistence system may be a system that receives interference from the LAA system or a system that gives interference to the LAA system. A coexistence system may support RTS and CTS, or equivalent transmission request and ready signals.

In the present embodiment, of the base station and the user terminal, a device (node A) that performs initial LBT (I-LBT) may be called a transmitting device. Among the base station and the user terminal, a device (node B or node C) that receives data transmitted by another device at a transmission opportunity (TxOP) acquired by another device (node A) may be referred to as a receiving device. . The data transmitted by the transmitting device and the receiving device may include at least one of user data and control information.

(Wireless communication method)
(Method 1)
The node that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs carrier sense (eg, LBT, short LBT or LTE) in a blank period (gap) for switching the transmission source within the transmission period (TxOP). LAA LBT). If the result of the carrier sense is busy, the node may cancel (drop) the remaining data transmission in the transmission opportunity (TxOP). Alternatively, when the result of the carrier sense is busy, the node may cancel at least one of data transmission by its own node and data transmission by another node.

(4) The node that has acquired the transmission opportunity (TxOP) notifies the result (busy or idle) of the carrier sense performed in the blank period (gap). The frame for notifying the result of the carrier sense is transmitted in a predetermined preamble pattern that does not require demodulation. Here, the preamble pattern that does not require demodulation refers to a preamble pattern that does not require demodulation processing, decoding processing, or reception processing equivalent thereto.

As described above, by notifying the result of the carrier sense (busy or idle) with a preamble pattern that does not require demodulation, the processing time of the node receiving this notification can be reduced. That is, the speed of the frame processing for notifying the result of the carrier sense can be increased. This makes it possible to reduce the gap length at the transmission opportunity (TxOP).

It is preferable that the demodulation unnecessary preamble pattern indicating the result (busy or idle) of the carrier sense is a different sequence at least between adjacent cells. A different sequence may be used for each destination user terminal (UE) or each user terminal (UE) group.

It is preferable that the preamble pattern be given an initial generation value by at least the cell ID. The preamble pattern may be given a generation initial value by a user terminal (UE) ID or a user terminal (UE) group ID.

The preamble pattern includes a sequence used for a reference signal such as a random access channel (PRACH: Physical Random Access Channel) or a discovery reference signal (DRS: Discovery Reference Signal), for example, a Zadoff-Chu sequence or a Gold sequence. May be used. In addition, the preamble pattern may be used by defining another unique pattern. It is preferable that the receiving side calculates a correlation value with an assumed pattern without demodulating the preamble pattern, and detects information based on whether the correlation value exceeds a threshold value.

Even if the result of the carrier sense (busy or idle) is notified using a preamble pattern that does not require demodulation, if the gap length allows no-LBT transmission (for example, 16 [μs] or less), COT sharing is performed. (Eg, node B or node C) may start transmission without performing LBT.

It is preferable that the transmission timing of the preamble pattern for notifying the result (busy or idle) of the carrier sense be notified in advance, for example, during data transmission by the node (eg, node A) that performed the initial LBT (I-LBT). In this case, the node that performs COT sharing (for example, node B or node C) may perform the operation of detecting the preamble pattern only at the timing notified in advance.

(4) The time of carrier sense (for example, short LBT) performed in the blank period (gap) is shorter than the gap time. The time of the short LBT may be shorter than the time of the initial LBT (I-LBT).

The node may perform the operation shown in any of the following methods 1-1 to 1-4. 6 and 7 are diagrams illustrating an example of the operation of a plurality of nodes in COT sharing.

(Method 1-1)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT within a blank period (gap) within the transmission period (TxOP). Only when the LBT result is busy, the node may notify the unlicensed CC of information indicating busy (for example, a busy notification frame).

6A and 6B show an example of the operation of a plurality of nodes in the COT sharing according to the method 1-1. The node A that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT during the subsequent blank period (gap) when the data transmission ends within the transmission opportunity (TxOP).

As shown in FIG. 6A, when the LBT result in the gap is busy (busy detection), the node A unpacks the busy notification frame with the preamble pattern that does not require demodulation in the remaining period of the gap in which the LBT has been performed. Sent in licensed CC.

Other nodes (node B and node C) that COT share the transmission opportunity (TxOP) acquired by node A, upon receiving the busy notification frame, cancel the data transmission even if data transmission is assigned. (Drop). The node B and the node C specify the LBT result (busy) without demodulating the preamble pattern.

As shown in FIG. 6B, when the LBT result in the gap is idle (idle detection), the node A does not transmit information (notification frame) indicating the result of the LBT. That is, the node A does not transmit information indicating idle (idle notification frame) or information indicating busy (busy notification frame).

The other nodes (Node B and Node C) that share the transmission opportunity (TxOP) acquired by the node A in the COT after receiving the data transmission by the node A do not receive the busy notification frame in the unlicensed CC. Data transmission allocated within (TxOP) is performed. Before the data transmission, the node B and the node C may respectively perform LBT. Alternatively, if the gap length allows no-LBT transmission (for example, 16 [μs] or less), node B and node C may each perform data transmission without LBT.

(Method 1-2)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT within a blank period (gap) within the transmission period (TxOP). The node may transmit information (notification frame) indicating the LBT result in the licensed CC. The information indicating the LBT result may be information indicating idle (idle notification frame) or information indicating busy (busy notification frame).

FIGS. 7A and 7B show an example of the operation of a plurality of nodes in COT sharing according to method 1-2. The node A that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT during the subsequent blank period (gap) when the data transmission ends within the transmission opportunity (TxOP). The node A transmits information (notification frame) indicating the result of the LBT in the licensed CC during the period of the remaining value of the gap in which the LBT has been performed.

As shown in FIG. 7A, when the LBT result in the gap is busy (busy detection), the node A converts the busy detection frame into a license using a preamble pattern that does not require demodulation in the remaining period of the gap in which the LBT has been performed. C.

As shown in FIG. 7B, when the LBT result in the gap is idle (idle detection), the node A transmits the idle detection frame to the license using a preamble pattern that does not require demodulation in the remaining period of the gap in which the LBT has been performed. C.

Other nodes (node B and node C) that share the transmission opportunity (TxOP) acquired by the node A by the COT receive the idle notification frame, and are assigned in the transmission opportunity (TxOP) of the unlicensed CC. Perform data transmission. Node B and node C specify the LBT result (idle) without demodulating the preamble pattern.

Other nodes (Node B and Node C) that share the transmission opportunity (TxOP) obtained by the node A by COT after receiving data from the node A do not receive a notification frame in the licensed CC. The data transmission allocated in the parentheses may be canceled. Alternatively, if the node B and the node C do not receive the notification frame in the licensed CC after the data transmission by the node A, the node B and the node C may perform the data transmission allocated in the transmission opportunity (TxOP). Before the data transmission, the node B and the node C may respectively perform LBT. Alternatively, if the gap length allows no-LBT transmission (for example, 16 [μs] or less), node B and node C may each perform data transmission without LBT.

(Method 1-3)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT within a blank period (gap) within the transmission period (TxOP). The node may transmit information (notification frame) indicating the LBT result in the unlicensed CC. The information indicating the LBT result may be information indicating idle (idle notification frame) or information indicating busy (busy notification frame).

7A and 7B show an example of the operation of a plurality of nodes in COT sharing according to method 1-3. The node A that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT during the subsequent blank period (gap) when the data transmission ends within the transmission opportunity (TxOP). The node A transmits information (notification frame) indicating the result of the LBT in the unlicensed CC during the period of the remaining value of the gap in which the LBT has been performed.

As illustrated in FIG. 7A, when the LBT result in the gap is busy (busy detection), the node A uses the preamble pattern that does not need to demodulate the busy detection frame in the remaining period of the gap in which the LBT has been performed. Sent in licensed CC.

As illustrated in FIG. 7B, when the LBT result in the gap is idle (idle detection), the node A uses the preamble pattern that does not require demodulation for the idle detection frame in the remaining period of the gap in which the LBT has been performed. Sent in licensed CC.

The other nodes (Node B and Node C) that share the transmission opportunity (TxOP) acquired by the node A by the COT after receiving the data transmission by the node A do not receive the notification frame in the unlicensed CC. The transmission of data allocated within TxOP) may be canceled. Alternatively, if the node B and the node C do not receive the notification frame in the unlicensed CC after the data transmission by the node A, the node B and the node C may perform the data transmission allocated within the transmission opportunity (TxOP). Before the data transmission, the node B and the node C may respectively perform LBT. Alternatively, if the gap length allows no-LBT transmission (for example, 16 [μs] or less), node B and node C may each perform data transmission without LBT.

(Method 1-4)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT in a blank period (gap) in the transmission period (TxOP). Only when the LBT result is busy, the node may notify information indicating busy (for example, a busy notification frame) in the licensed CC.

6A and 6B show an example of the operation of a plurality of nodes in the COT sharing according to the method 1-4. The node A that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT during the subsequent blank period (gap) when the data transmission ends within the transmission opportunity (TxOP).

As shown in FIG. 6A, when the LBT result in the gap is busy (busy detection), the node A transmits the busy notification frame to the license using a preamble pattern that does not require demodulation in the remaining period of the gap in which the LBT has been performed. C. Here, the preamble pattern that does not require demodulation refers to a preamble pattern that does not require demodulation processing, decoding processing, or reception processing equivalent thereto.

In Method 1, the busy notification frame may be information instructing cancellation of data transmission, information indicating changed data transmission allocation, or deactivation (release, release) of data transmission. ) May be used.

In method 1, the idle notification frame may be information indicating assignment of data transmission of another node, or information indicating activation of data transmission.

The busy notification frame or the idle notification frame includes a downlink control channel (for example, PDCCH: Physical Downlink Control Channel or DCI: Downlink Control Information), a scheduled downlink channel (for example, PDSCH: Physical Downlink Shared Channel), and a user terminal-specific uplink. By a channel (eg, PUCCH: Physical Uplink Control Channel), an uplink channel scheduled by a dynamic grant (eg, PUSCH: Physical Uplink Shared Channel), or an uplink channel not scheduled by a dynamic grant (eg, grant-free PUSCH). It may be sent.

The busy notification frame or the idle notification frame may include an identifier of a transmission source (for example, a MAC (Media Access Control) address, a user terminal (UE) ID or a cell ID), or an identifier of a transmission destination (for example, , MAC address, user terminal (UE) ID or cell ID), and information (eg, time resource) on data transmission allocation.

According to the method 1, it is possible to reduce the loss of the radio resource due to the collision of the signal and to improve the utilization efficiency of the radio resource. Furthermore, since the result of the carrier sense in the gap is reported using a preamble pattern that does not require demodulation, the processing delay of the device can be reduced, and the gap length in the transmission opportunity (TxOP) can be reduced. Thereby, the required LBT method can be simplified.

(Method 2)
The node that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs carrier sense (eg, LBT, short LBT or LTE) in a blank period (gap) for switching the transmission source within the transmission period (TxOP). LAA LBT). If the result of the carrier sense is busy, the node may cancel (drop) data transmission by another node and perform data transmission by its own node in the remaining period within the transmission opportunity (TxOP).

(4) The node that has acquired the transmission opportunity (TxOP) notifies the result (busy or idle) of the carrier sense performed in the blank period (gap). The frame for notifying the result of the carrier sense is transmitted in a predetermined preamble pattern that does not require demodulation, as in method 1. Here, the preamble pattern that does not require demodulation refers to a preamble pattern that does not require demodulation processing, decoding processing, or reception processing equivalent thereto.

Similarly to method 1, by notifying the result of the carrier sense (busy or idle) with a preamble pattern that does not require demodulation, the processing time of the node receiving this notification can be reduced. That is, the speed of the frame processing for notifying the result of the carrier sense can be increased. Thereby, the gap length in the transmission opportunity (TxOP) can be shortened.

The node may perform the operation described in any of the following methods 2-1 to 2-4. FIG. 8 is a diagram illustrating an example of the operation of a plurality of nodes in COT sharing.

(Method 2-1)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT within a blank period (gap) within the transmission period (TxOP). Only when the LBT result is busy, the node may notify the unlicensed CC of information indicating busy (for example, a busy notification frame).

As shown in FIG. 8, the node A that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT), when the data transmission is completed within the transmission opportunity (TxOP), within the subsequent blank period (gap) Perform LBT.

If the LBT result in the gap is busy (busy detection), the node A transmits a busy notification frame in the unlicensed CC in a preamble pattern that does not require demodulation during the remaining period of the gap in which the LBT has been performed.

Node A transmits data during the remaining period of the acquired transmission opportunity (TxOP).

Operation when the LBT result in the gap is idle (idle detection) is the same as that of method 1-1 (for example, see FIG. 6B).

(Method 2-2)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT within a blank period (gap) within the transmission period (TxOP). The node may transmit information (notification frame) indicating the LBT result in the licensed CC. The information indicating the LBT result may be information indicating idle (idle notification frame) or information indicating busy (busy notification frame).

If the LBT result in the gap is busy (busy detection), the node A transmits the busy notification frame in the licensed CC in a preamble pattern that does not require demodulation during the remaining period of the gap in which the LBT has been performed.

Operation when the LBT result in the gap is idle (idle detection) is the same as that of method 1-2 (for example, see FIG. 7B).

(Method 2-3)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT within a blank period (gap) within the transmission period (TxOP). The node may transmit information (notification frame) indicating the LBT result in the unlicensed CC. The information indicating the LBT result may be information indicating idle (idle notification frame) or information indicating busy (busy notification frame).

Operation when the LBT result in the gap is idle (idle detection) is the same as that of method 1-3 (for example, see FIG. 7B).

(Method 2-4)
The node (for example, node A) that has acquired the transmission opportunity (TxOP) by the initial LBT (I-LBT) performs the LBT within a blank period (gap) within the transmission period (TxOP). Only when the LBT result is busy, the node may notify the information indicating busy (for example, a busy notification frame) in the licensed CC.

Operation when the LBT result in the gap is idle (idle detection) is the same as that of method 1-4 (for example, see FIG. 6B).

According to method 2, loss of radio resources due to signal collision can be reduced and radio resource utilization efficiency can be improved. Furthermore, since the result of the carrier sense in the gap is notified by the preamble pattern that does not require demodulation, the processing delay of the device can be reduced, and the gap length in the transmission opportunity (TxOP) can be shortened.

According to the method 2, compared to the method 1, the loss of the radio resource can be further reduced, and the utilization efficiency of the radio resource can be increased.

(Wireless communication system)
Hereinafter, the configuration of the wireless communication system according to the present embodiment will be described. In this wireless communication system, the wireless communication method according to the above embodiment is applied.

FIG. 9 is a diagram showing an example of a schematic configuration of the wireless communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (CA) or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit is applied. Can be. The wireless communication system 1 may be referred to as SUPER @ 3G, LTE-A (LTE-Advanced), IMT-Advanced, 4G, 5G, FRA (Future Radio Access), NR (New Rat), or the like.

The wireless communication system 1 includes a base station 11 forming a macro cell C1, and base stations 12a to 12c arranged in the macro cell C1 and forming small cells C2 smaller than the macro cell C1. User terminals 20 are arranged in the macro cell C1 and each small cell C2. A configuration in which different numerology is applied between cells may be adopted. Numerology refers to a signal design in a certain RAT and a set of communication parameters that characterize the RAT design.

The user terminal 20 can be connected to both the base station 11 and the base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 using different frequencies simultaneously by carrier aggregation (CA) or dual connectivity (DC). The user terminal 20 can apply carrier aggregation (CA) or dual connectivity (DC) using a plurality of cells (CCs) (for example, two or more CCs). The user terminal can use the licensed band CC and the unlicensed band CC as a plurality of cells. A configuration in which a TDD carrier to which the shortened TTI is applied is included in any of a plurality of cells may be employed.

Communication between the user terminal 20 and the base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (existing carrier, called Legacy carrier, etc.). A carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, 30 to 70 GHz, etc.) and a wide bandwidth may be used between the user terminal 20 and the base station 12, The same carrier as that between may be used. The configuration of the frequency band used by each base station is not limited to this.

Between the base station 11 and the base station 12 (or between the two base stations 12), a wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, or the like) or a wireless connection is used. It can be.

The base station 11 and each base station 12 are connected to the upper station apparatus 30 and are connected to the core network 40 via the upper station apparatus 30. The upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Each base station 12 may be connected to the higher station apparatus 30 via the base station 11.

The base station 11 is a base station having relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. The base station 12 is a base station having local coverage, and is called a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), a transmission / reception point, or the like. It may be. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as a base station 10.

Each user terminal 20 is a terminal corresponding to various communication systems such as LTE and LTE-A, and may include not only mobile communication terminals but also fixed communication terminals.

In the wireless communication system 1, OFDMA (orthogonal frequency division multiple access) can be applied to the downlink (DL) and SC-FDMA (single carrier-frequency division multiple access) can be applied to the uplink (UL) as a wireless access method. it can. OFDMA is a multicarrier transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), and data is mapped to each subcarrier to perform communication. SC-FDMA is a single-carrier transmission scheme that divides a system bandwidth into bands each composed of one or a continuous resource block for each terminal, and reduces interference between terminals by using different bands from each other. is there. The uplink and downlink radio access schemes are not limited to these combinations, and OFDMA may be used in UL.

In the wireless communication system 1, as DL channels, downlink data channels (PDSCH: Physical Downlink Shared Channel, also referred to as downlink shared channels), broadcast channels (PBCH: Physical Broadcast Channel), L1 / L2 shared by each user terminal 20 are used. A control channel or the like is used. The PDSCH transmits user data, higher layer control information, SIB (System Information Block), and the like. MIB (Master Information Block) is transmitted by PBCH.

The L1 / L2 control channels include downlink control channels (PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel)), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. . Downlink control information (DCI: Downlink Control Information) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. By PCFICH, the number of OFDM symbols used for PDCCH is transmitted. HARQ transmission acknowledgment information (ACK / NACK) for PUSCH is transmitted by PHICH. EPDCCH is frequency-division multiplexed with PDSCH (Downlink Shared Data Channel) and used for transmission of DCI and the like like PDCCH.

In the radio communication system 1, as the UL channel, an uplink data channel (PUSCH: Physical Uplink Shared Channel, also referred to as an uplink shared channel) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), random An access channel (PRACH: Physical @ Random @ Access @ Channel) or the like is used. User data and higher layer control information are transmitted by PUSCH. Uplink control information (UCI: Uplink Control Information) including at least one of acknowledgment information (ACK / NACK) and radio quality information (CQI) is transmitted by PUSCH or PUCCH. The PRACH transmits a random access preamble for establishing a connection with a cell.

<Base station>
FIG. 10 is a diagram showing an example of the overall configuration of the base station according to the present embodiment. The base station 10 includes a plurality of transmitting / receiving antennas 101, an amplifier unit 102, a transmitting / receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. The transmitting / receiving antenna 101, the amplifier unit 102, and the transmitting / receiving unit 103 may be configured to include at least one each. The base station 10 is a transmitting device for downlink data and may be a receiving device for uplink data.

下り The downlink data transmitted from the base station 10 to the user terminal 20 is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.

In the baseband signal processing unit 104, regarding downlink data, processing of a PDCP (Packet Data Convergence Protocol) layer, division / combination of user data, transmission processing of an RLC layer such as RLC (Radio Link Control) retransmission control, MAC (Medium Access) Control) The transmission / reception unit performs transmission processing such as retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing. 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

(4) The transmission / reception section 103 converts the baseband signal precoded and output from the baseband signal processing section 104 for each antenna into a radio frequency band, and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 103 is amplified by the amplifier section 102 and transmitted from the transmitting / receiving antenna 101. The transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention. The transmission / reception unit 103 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

As for the uplink signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. Transmitting / receiving section 103 frequency-converts the received signal into a baseband signal and outputs the baseband signal to baseband signal processing section 104.

The baseband signal processing unit 104 performs fast Fourier transform (FFT: Fast Fourier Transform), inverse discrete Fourier transform (IDFT), and error correction on user data included in the input uplink signal. Decoding, reception processing of MAC retransmission control, reception processing of the RLC layer and PDCP layer are performed, and the data is transferred to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing such as setting and release of a communication channel, state management of the base station 10, and management of radio resources.

The transmission path interface 106 transmits and receives signals to and from the higher-level station device 30 via a predetermined interface. The transmission path interface 106 may transmit and receive signals (backhaul signaling) to and from another base station 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). .

The transmitting / receiving section 103 includes a downlink signal (for example, a downlink control signal (downlink control channel), a downlink data signal (downlink data channel, downlink shared channel), a downlink reference signal (DM-RS, CSI-RS, etc.), a discovery signal, a synchronization signal, Signals, broadcast signals, etc.). The transmitting / receiving section 103 receives an uplink signal (for example, an uplink control signal (uplink control channel), an uplink data signal (uplink data channel, uplink shared channel), an uplink reference signal, and the like).

Transceiving section 103 may transmit a signal based on a result of listening to an unlicensed CC (first frequency band). The signal includes a data signal and an RTS (transmission request signal). The transmission / reception section 103 may transmit the signal in one of the unlicensed CC (first frequency band) and the licensed CC (second frequency band). The transmission / reception section 103 may receive a response signal to the signal. The response signal includes ACK (acknowledge) and CTS (response signal to the transmission request signal). The transmission / reception section 103 may receive the response signal in one of the unlicensed CC (first frequency band) and the licensed CC (second frequency band). The transmitting / receiving section 103 may transmit or receive a result of listening to the unlicensed CC (first frequency band).

Transceiving section 103 may transmit the first signal (eg, data signal) at a transmission opportunity (TxOP) based on the result of the first listening (eg, initial LBT (I-LBT)). The transmission / reception unit 103 transmits information (for example, a notification frame, a busy notification) indicating the result of the second listening (for example, LBT) during a period after the transmission of the first signal in the transmission opportunity (TxOP) based on the result of the first listening. Frame, idle notification frame) may be transmitted in a preamble pattern that does not require demodulation.

The transmitting unit and the receiving unit of the present invention are configured by both or any one of the transmitting and receiving unit 103 and the transmission line interface 106.

FIG. 11 is a diagram showing an example of a functional configuration of the base station according to the present embodiment. Note that FIG. 11 mainly illustrates functional blocks of characteristic portions in the present embodiment, and the base station 10 has other functional blocks necessary for wireless communication. As shown in FIG. 11, the baseband signal processing unit 104 includes at least a control unit 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305.

The control unit 301 controls the entire base station 10. The control unit 301 can be configured by a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

The control unit 301 controls, for example, generation of a signal by the transmission signal generation unit 302 and allocation of a signal by the mapping unit 303. The control unit 301 controls signal reception processing by the reception signal processing unit 304 and signal measurement by the measurement unit 305.

Control section 301 controls scheduling of downlink signals and uplink signals (for example, resource allocation). Specifically, control section 301 transmits and generates DCI (DL assignment, DL grant) including scheduling information of the downlink data channel and DCI (UL grant) including scheduling information of the uplink data channel. It controls the signal generation unit 302, the mapping unit 303, and the transmission / reception unit 103.

The control unit 301 may control signal transmission or reception in an unlicensed CC (first frequency band) or a licensed CC (second frequency band).

Control section 301 transmits the result of the second listening (eg, LBT) in a period after the transmission of the first signal in the transmission opportunity (TxOP) based on the result of the first listening (eg, initial LBT (I-LBT)). (For example, a notification frame, a busy notification frame, and an idle notification frame) may be controlled to be notified in a preamble pattern that does not require demodulation.

The transmission signal generation unit 302 generates a downlink signal (a downlink control channel, a downlink data channel, a downlink reference signal such as a DM-RS, etc.) based on an instruction from the control unit 301, and outputs the downlink signal to the mapping unit 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

Mapping section 303 maps the downlink signal generated by transmission signal generating section 302 to a predetermined radio resource based on an instruction from control section 301, and outputs it to transmitting / receiving section 103. The mapping unit 303 can be composed of a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.

Reception signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from transmission / reception section 103. For example, the received signal is an uplink signal (uplink control channel, uplink data channel, uplink reference signal, etc.) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.

(4) The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, the reception processing unit 304 outputs at least one of a preamble, control information, and UL data to the control unit 301. Further, reception signal processing section 304 outputs the reception signal and the signal after the reception processing to measurement section 305.

(4) The measurement unit 305 performs measurement on the received signal. The measurement unit 305 can be configured by a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present invention.

The measurement unit 305 may measure, for example, the reception power (for example, RSRP (Reference Signal Received Power)), the reception quality (for example, RSRQ (Reference Signal Received Quality)) of the received signal, the channel state, and the like. The measurement result may be output to the control unit 301.

<User terminal>
FIG. 12 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. The user terminal 20 includes a plurality of transmitting / receiving antennas 201, an amplifier unit 202, a transmitting / receiving unit 203, a baseband signal processing unit 204, and an application unit 205. The transmitting / receiving antenna 201, the amplifier unit 202, and the transmitting / receiving unit 203 may be configured to include at least one each. The user terminal 20 is a receiving device for downlink data and may be a transmitting device for uplink data.

(4) The radio frequency signal received by the transmitting / receiving antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception section 203 converts the frequency of the received signal into a baseband signal, and outputs the baseband signal to the baseband signal processing section 204. The transmission / reception unit 203 can be composed of a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention. The transmission / reception unit 203 may be configured as an integrated transmission / reception unit, or may be configured from a transmission unit and a reception unit.

(4) The baseband signal processing unit 204 performs FFT processing, error correction decoding, reception processing of retransmission control, and the like on the input baseband signal. The downlink data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Of the downlink data, system information and higher layer control information are also transferred to the application unit 205.

UL data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processor 204 performs retransmission control transmission processing (eg, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like, and performs transmission and reception. The data is transferred to the unit 203. The transmitting / receiving section 203 converts the baseband signal output from the baseband signal processing section 204 into a radio frequency band and transmits the radio frequency band. The radio frequency signal frequency-converted by the transmitting / receiving section 203 is amplified by the amplifier section 202 and transmitted from the transmitting / receiving antenna 201.

The transmitting / receiving section 203 includes a downlink signal (for example, a downlink control signal (downlink control channel), a downlink data signal (downlink data channel, downlink shared channel), a downlink reference signal (DM-RS, CSI-RS, etc.), a discovery signal, a synchronization signal, Signal, annunciation signal, etc.). The transmitting / receiving section 203 transmits an uplink signal (eg, an uplink control signal (uplink control channel), an uplink data signal (uplink data channel, uplink shared channel), an uplink reference signal, and the like).

The transmission / reception unit 203 may transmit a signal based on a result of listening to an unlicensed CC (first frequency band). The signal includes a data signal and an RTS (transmission request signal). The transmission / reception unit 203 may transmit the signal in one of the unlicensed CC (first frequency band) and the licensed CC (second frequency band). The transmission / reception unit 203 may receive a response signal to the signal. The response signal includes ACK (acknowledge) and CTS (response signal to the transmission request signal). The transmission / reception unit 203 may receive the response signal in one of the unlicensed CC (first frequency band) and the licensed CC (second frequency band). The transmission / reception unit 203 may transmit or receive the result of listening to the unlicensed CC (first frequency band).

The transmission / reception unit 203 notifies a transmission opportunity (TxOP) based on the result of the first listening (for example, initial LBT (I-LBT)) by the transmission device of a preamble pattern that does not require demodulation during a period after transmission of the first signal. Information (eg, a notification frame, a busy notification frame, an idle notification frame) indicating the result of the second listening (eg, LBT) performed may be received.

FIG. 13 is a diagram showing an example of a functional configuration of the user terminal according to the present embodiment. FIG. 13 mainly shows functional blocks of characteristic portions in the present embodiment, and it is assumed that user terminal 20 also has other functional blocks necessary for wireless communication. As illustrated in FIG. 13, the baseband signal processing unit 204 of the user terminal 20 includes a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. At least have.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be configured by a controller, a control circuit, or a control device that is described based on common recognition in the technical field according to the present invention.

The control unit 401 controls, for example, generation of a signal by the transmission signal generation unit 402 and assignment of a signal by the mapping unit 403. The control unit 401 controls signal reception processing by the reception signal processing unit 404 and signal measurement by the measurement unit 405.

The control unit 401 may control signal transmission or reception in an unlicensed CC (first frequency band) or a licensed CC (second frequency band).

The control unit 401 notifies the transmission opportunity (TxOP) based on the result of the first listening (for example, the initial LBT (I-LBT)) by the transmitting device of a preamble pattern that does not require demodulation during a period after the transmission of the first signal. From the information (for example, a notification frame, a busy notification frame, and an idle notification frame) indicating the result of the second listening (for example, LBT) performed, detection of the information indicating the result of the second listening without demodulating the preamble pattern is performed. Control. The control unit 401 controls the transmission of the second signal (for example, a data signal) in the transmission opportunity (TxOP) during the period after the reception of the information, based on the information.

Transmission signal generation section 402 generates an uplink signal (uplink control channel, uplink data channel, uplink reference signal, etc.) based on an instruction from control section 401 and outputs the generated signal to mapping section 403. The transmission signal generation unit 402 can be configured from a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

Transmission signal generation section 402 generates an uplink data channel based on an instruction from control section 401. For example, when the UL grant is included in the downlink control channel notified from the base station 10, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data channel.

Mapping section 403 maps the uplink signal generated by transmission signal generation section 402 to a radio resource based on an instruction from control section 401, and outputs the result to transmission / reception section 203. The mapping unit 403 can be configured with a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.

Reception signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from transmission / reception section 203. For example, the received signal is a downlink signal (a downlink control channel, a downlink data channel, a downlink reference signal, etc.) transmitted from the base station 10. The reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. The reception signal processing unit 404 can constitute a reception unit according to the present invention.

The received signal processing unit 404 performs blind decoding on the downlink control channel for scheduling transmission and reception of the downlink data channel based on the instruction of the control unit 401, and performs reception processing of the downlink data channel based on the DCI. Received signal processing section 404 estimates a channel gain based on DM-RS or CRS, and demodulates a downlink data channel based on the estimated channel gain.

(4) The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. The reception signal processing unit 404 may output the data decoding result to the control unit 401. The reception signal processing unit 404 outputs the reception signal and the signal after the reception processing to the measurement unit 405.

The measurement unit 405 performs measurement on the received signal. The measurement unit 405 can be configured by a measurement device, a measurement circuit, or a measurement device described based on common recognition in the technical field according to the present invention.

Measurement section 405 may measure, for example, the received power (eg, RSRP), DL reception quality (eg, RSRQ), channel state, and the like of the received signal. The measurement result may be output to the control unit 401.

(Hardware configuration)
The block diagram used in the description of the above embodiment shows blocks in functional units. These functional blocks (configuration units) are realized by an arbitrary combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be realized using one device physically or logically coupled, or directly or indirectly (for example, two or more devices physically or logically separated from each other). , Wired, wireless, etc.) and using these multiple devices. The functional block may be realized by combining one device or the plurality of devices with software.

Here, the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. Not limited. For example, a functional block (configuration unit) that causes transmission to function may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like. In any case, as described above, the realization method is not particularly limited.

For example, a base station, a user terminal, and the like according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method according to the present disclosure. FIG. 14 is a diagram illustrating an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically 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. .

では In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the devices illustrated in the drawing, or may be configured to exclude some of the devices.

For example, although only one processor 1001 is illustrated, there may be multiple processors. The processing may be performed by one processor, or the processing may be performed by two or more processors simultaneously, sequentially, or using other techniques. Processor 1001 may be implemented by one or more chips.

The functions of the base station 10 and the user terminal 20 are performed by, for example, reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002 so that the processor 1001 performs an arithmetic operation and communicates via the communication device 1004. And controlling at least one of data reading and writing in the memory 1002 and the storage 1003.

The processor 1001 controls an entire computer by operating an operating system, for example. 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 device, a register, and the like. For example, the above-described baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to 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 operation described in the above embodiment is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and other functional blocks may be similarly realized.

The memory 1002 is a computer-readable recording medium, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), and other appropriate storage media. It may be constituted by one. The memory 1002 may be called 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, and the like that can be executed to implement the wireless communication method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc) ROM, etc.), a digital versatile disc, Blu-ray® disks), removable disks, hard disk drives, smart cards, flash memory devices (eg, cards, sticks, key drives), magnetic stripes, databases, servers, and / or other suitable storage media May be configured. The storage 1003 may be called an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for performing communication 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 a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like, for example, in order to realize at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). May be configured. For example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission line interface 106, and the like described above may be realized by the communication device 1004. The transmission / reception unit 103 may be physically or logically separated by the transmission unit 103a and the reception unit 103b.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an external input. The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, and the like). The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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

The base station 10 and the user terminal 20 include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array). It may be configured so as to include some or all of the functional blocks using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

(Modification)
Terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meaning. For example, at least one of the channel and the symbol may be a signal (signaling). The signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like according to an applied standard. A component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, or the like.

The radio frame may be configured by one or more periods (frames) in the time domain. The one or more periods (frames) constituting the radio frame may be referred to as a subframe. Further, a subframe may be configured by one or more slots in the time domain. A subframe may be of a fixed length of time (eg, 1 ms) that does not depend on numerology.

ニュー Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. 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, radio frame configuration, transceiver in frequency domain At least one of a specific filtering process to be performed, a specific windowing process performed by the transceiver in the time domain, and the like may be indicated.

The slot may be configured by one or more symbols (OFDM (Orthogonal Frequency Divide Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Frequency Division Multiple Access) symbol, etc.) in the time domain. A slot may be a time unit based on pneumatics.

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

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots, and symbols 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 a TTI, and one slot or one minislot is called a TTI. You may. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1 to 13 symbols), or a period longer than 1 ms. It may be. The unit representing the TTI may be called a slot, a minislot, or the like instead of a subframe.

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

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

If one slot or one minislot is called a TTI, one or more TTIs (ie, one or more slots or one or more minislots) may be the minimum time unit for scheduling. The number of slots (mini-slot number) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE@Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, and the like. A TTI shorter than the normal TTI may be called 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.

A long TTI (eg, a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, and a short TTI (eg, a shortened TTI, etc.) may be replaced with a TTI that is less than the TTI length of the long TTI and 1 ms or more. The TTI having the TTI length may be read.

The resource block (RB: Resource Block) is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain.

The RB may include one or more symbols in the time domain, and may be one slot, one minislot, one subframe, or one TTI in length. One TTI and one subframe may be configured by one or more resource blocks, respectively.

One or more RBs are called a physical resource block (PRB: Physical @ RB), a subcarrier group (SCG: Sub-Carrier @ Group), a resource element group (REG: Resource @ Element @ Group), a PRB pair, an RB pair, and the like. You may.

The resource block may be configured by one or more resource elements (RE: Resource ： Element). For example, one RE may be a radio resource area of one subcarrier and one symbol.

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

Information, parameters, and the like described in the present disclosure may be expressed using an absolute value, may be expressed using a relative value from a predetermined value, or may be expressed using another corresponding information. You may. For example, a radio resource may be indicated by a predetermined index.

名称 Names used for parameters and the like in the present disclosure are not limited in any way. Further, the formulas and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so the various names assigned to these various channels and information elements Is not a limiting name in any way.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., that may be referred to throughout the above description are not limited to voltages, currents, electromagnetic waves, magnetic or magnetic particles, light fields or photons, or any of these. May be represented by a combination of

Information, signals, and the like can be output from the upper layer to at least one of the lower layer and the lower layer to the upper layer. Information, signals, and the like may be input and output via a plurality of network nodes.

(4) Information and signals input and output may be stored in a specific place (for example, a memory) or may be managed using a management table. Information and signals that are input and output can be overwritten, updated, or added. The output information, signal, and the like may be deleted. The input information, signal, and the like may be transmitted to another device.

Notification of information is not limited to the aspect / embodiment described in the present disclosure, and may be performed using another method. For example, the information is notified by physical layer signaling (for example, downlink control information (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information)), higher layer signaling (for example, RRC (Radio Resource Control) signaling, It may be implemented by broadcast information (Master Information Block (MIB: Master Information Block), system information block (SIB: System Information Block), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

Physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like. The RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. MAC signaling may be notified using, for example, a MAC control element (MAC @ CE (Control @ Element)).

The notification of the predetermined information (for example, the notification of “X”) is not limited to an explicit notification, and is implicit (for example, by not performing the notification of the predetermined information or notifying of another information). ).

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

Software, regardless of whether it is called software, firmware, middleware, microcode, a hardware description language, or any other name, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Software, instructions, information, etc. may be transmitted and received via transmission media. For example, if 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 / or wireless technologies is included within the definition of a transmission medium.

用語 As used in this disclosure, the terms “system” and “network” may be used interchangeably.

In the present disclosure, “precoding”, “precoder”, “weight (precoding weight)”, “pseudo collocation (QCL: Quasi-Co-Location)”, “transmission power”, “phase rotation”, “antenna port” , "Antenna port group", "layer", "number of layers", "rank", "beam", "beam width", "beam angle", "antenna", "antenna element", "panel", etc. The terms may be used interchangeably.

In the present disclosure, “base station (BS: Base @ Station)”, “wireless base station”, “fixed station (fixed @ station)”, “NodeB”, “eNodeB (eNB)”, “gNodeB (gNB)”, “ "Access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", Terms such as "carrier", "component carrier", "Bandwidth Part (BWP)" may be used interchangeably. A base station may be referred to by a term such as a macro cell, a small cell, a femto cell, a pico cell, and the like.

A base station can accommodate one or more (eg, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned 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 通信 Head)). The term "cell" or "sector" refers to a part or the entire coverage area of at least one of a base station and a base station subsystem that provide communication services in this coverage.

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

A mobile station is a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal. , Handset, user agent, mobile client, client or some other suitable terminology.

少なくとも 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 unit, the mobile unit itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (maned or unmanned). ). At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

基地 The base station in the present disclosure may be replaced with a user terminal. For example, communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (for example, may be called D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). As for the configuration, each aspect / embodiment of the present disclosure may be applied. In this case, the configuration may be such that the user terminal 20 has the function of the base station 10 described above. Words such as “up” and “down” may be read as words corresponding to communication between terminals (for example, “side”). For example, an uplink channel, a downlink channel, and the like may be replaced with a side channel.

Similarly, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the function of the user terminal 20 described above.

In the present disclosure, an operation performed by the base station may be performed by an upper node (upper node) in some cases. In a network including one or more network nodes having a base station (network @ nodes), various operations performed for communication with a terminal include a base station, one or more network nodes other than the base station (eg, Obviously, it can be performed by MME (Mobility Management 、 Entity), S-GW (Serving-Gateway) or the like, but not limited thereto, or a combination thereof.

各 Each aspect / embodiment described in the present disclosure may be used alone, may be used in combination, or may be switched and used in execution. Further, the processing procedure, sequence, flowchart, and the like of each aspect / embodiment described in the present disclosure may be interchanged as long as there is no inconsistency. For example, for the methods described in this disclosure, elements of the various steps are presented in an exemplary order, and are not limited to the specific order presented.

Each aspect / embodiment described in the present disclosure is applicable to LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication). system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered trademark) (Global System for Mobile Communications), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802. 20, UWB (Ultra-WideBand), Bluetooth (registered trademark) , A system using other suitable wireless communication methods, and a next-generation system extended based on these methods. A plurality of systems may be combined (for example, a combination of LTE or LTE-A and 5G) and applied.

記載 The term "based on" as used in the present disclosure does not mean "based solely on" unless stated otherwise. In other words, the description "based on" means both "based only on" and "based at least on."

いかなる Any reference to elements using "first," "second," etc., as used in this disclosure, does not generally limit the quantity or order of those elements. These designations may be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not mean that only two elements can be employed or that the first element must precede the second element in some way.

用語 The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, “judgment” means judging, calculating, computing, processing, deriving, investigating, searching (up, search, inquiry) ( For example, a search in a table, database, or another data structure), ascertaining, etc., may be considered to be "determining."

"Determining" includes receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, and accessing. (E.g., accessing data in a memory) or the like may be considered to be "determining (determining)."

“Judgment (decision)” may be regarded as “judgment (decision)” of resolving, selecting, choosing, establishing, comparing, and the like. . That is, “judgment (decision)” may be regarded as “judgment (decision)” of any operation.

"Judgment (decision)" may be read as "assuming," "expecting," "considering."

The “maximum transmission power” described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal maximum transmission power (the nominal UE maximum transmit power), or may refer to the rated maximum transmission power (the rated UE maximum transmit power).

As used in this disclosure, the terms “connected”, “coupled”, or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements. And may include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”.

In the present disclosure, where two elements are connected, using one or more wires, cables, printed electrical connections, etc., and as some non-limiting and non-exhaustive examples, the radio frequency domain, microwave It can be considered "connected" or "coupled" to each other using electromagnetic energy having wavelengths in the region, the light (both visible and invisible) regions, and the like.

において In the present disclosure, the term “A and B are different” may mean that “A and B are different from each other”. Terms such as "away" and "coupled" may be interpreted similarly.

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

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

Although the invention according to the present disclosure has been described in detail above, it is obvious to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and changes without departing from the spirit and scope of the invention determined based on the description in the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not bring any restrictive meaning to the invention according to the present disclosure.

Claims

A transmitting unit that transmits the first signal at a transmission opportunity based on a result of the first listening;
A transmission device, comprising: a control unit that controls information indicating a result of the second listening in a preamble pattern that does not require demodulation during a period after the transmission of the first signal in the transmission opportunity.
2. The transmission apparatus according to claim 1, wherein the preamble pattern uses a different sequence at least between adjacent cells. 3.
The transmitting apparatus according to claim 1, wherein the preamble pattern uses a different sequence for each destination receiving apparatus or each destination receiving apparatus group.
2. The transmitting apparatus according to claim 1, wherein the preamble pattern is given a generation initial value by at least a cell ID. 3.
The transmitting device according to claim 1, wherein the preamble pattern is a pattern that allows a receiving device to calculate a correlation value and detect the information based on a relationship between the correlation value and a threshold value. .
Among the transmission opportunities based on the result of the first listening by the transmitting device, during the period after the transmission of the first signal from the transmitting device, information indicating the result of the second listening notified by the preamble pattern unnecessary for demodulation is received. A receiving unit,
And a control unit that controls transmission of the second signal during a period after the reception of the information among the transmission opportunities based on the information.