Communication device and communication method

Abstract

According to the present invention, a communication device: has a transmission unit for transmitting a connection request to a first communication device, a reception unit for receiving a connection permission from the first communication device, and a control unit for establishing a first connection with the first communication device; and has a control unit for controlling communication with a second communication device.

Description

Technical Field

[0001] The present invention relates to a communication device and a communication method in a wireless communication system.

Background Art

[0002] In 3GPP (3rd Generation Partnership Project), in order to achieve further increase in system capacity, further increase in data transmission speed, further reduction in latency in the wireless section, etc., a wireless communication method called 5G or NR (New Radio) (hereinafter, this wireless communication method is referred to as "NR") is being studied. In 5G, in order to meet the requirement of achieving a throughput of 10 Gbps or more while reducing the latency in the wireless section to 1 ms or less, various wireless technologies and network architectures are being studied (for example, Non-Patent Document 1).

[0003] Furthermore, the study of 6G has been started as the next-generation wireless communication method after 5G, and the realization of wireless quality exceeding 5G is expected. For example, in 6G, studies are underway to achieve further increase in capacity, use of new frequency bands, further reduction in latency, further high reliability, expansion of coverage in new areas (high altitude, sea, space), etc. (for example, Non-Patent Document 2).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] In 6G, in order to further improve communication speed, capacity, reliability, latency performance, etc., it is assumed that a higher frequency than before is used. When using such a high frequency, a super-wide bandwidth can be used, enabling high speed, and low latency can be achieved due to the short symbol length. On the other hand, it is assumed that the coverage is narrowed due to the large attenuation rate, and the reliability is reduced due to the high directivity.

[0006] Due to the characteristics of the frequency band using such a high frequency, it is important to ensure redundancy in order to provide services to the areas where 6G communication is required.

[0007] The present invention has been made in view of the above points, and an object thereof is to ensure network redundancy in a wireless communication system.

Means for Solving the Problems

[0008] According to the disclosed technology, a transmission unit that transmits a connection request to Base station and a reception unit that receives a connection permission from the Base station and a control unit that establishes a first connection with the Base station are provided. The control unit with the terminal controls the wireless communication, Establish an RRC (Radio Resource Control) connection with the terminal, The control unit manages the first connection using a timer, and when the transmission and reception of signals with the Base station are not completed until the timer expires, it is determined that the first connection has been disconnected and , After the RRC connection is established, when the first connection is disconnected, the control unit disconnects the RRC connection. A communication device is provided.

Advantages of the Invention

[0009] According to the disclosed technology, a technology for ensuring network redundancy in a wireless communication system is provided.

Brief Description of the Drawings

[0010]

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Embodiments for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies may be used as appropriate. The existing technologies are, for example, existing NR or LTE, but are not limited to existing NR or LTE.

[0013] FIG. 1 is a diagram for explaining an example (1) of a wireless communication system according to an embodiment of the present invention. The wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20 as shown in FIG. 1. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is an example, and there may be a plurality of each.

[0014] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. Also, the TTI (Transmission Time Interval) in the time domain may be a slot or a subframe.

[0015] The base station 10 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs (Component Carriers)) are bundled to communicate with the terminal 20. In carrier aggregation, one PCell (Primary Cell) and one or more SCells (Secondary Cells) are used.

[0016] The base station 10 transmits synchronization signals, system information, etc. to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, by NR-PBCH or PDSCH, and is also referred to as broadcast information. As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 in the DL (Downlink) and receives control signals or data from the terminal 20 in the UL (Uplink). Here, what is transmitted on control channels such as PUCCH and PDCCH is called a control signal, and what is transmitted on shared channels such as PUSCH and PDSCH is called data, but such a naming method is just an example.

[0017] The terminal 20 is a communication device equipped with a wireless communication function such as a smartphone, a mobile phone, a tablet, a wearable terminal, and a communication module for M2M (Machine-to-Machine). As shown in FIG. 1, the terminal 20 receives control signals or data from the base station 10 in the DL and transmits control signals or data to the base station 10 in the UL, thereby using various communication services provided by the wireless communication system. Note that the terminal 20 may be called a UE, and the base station 10 may be called a gNB.

[0018] The terminal 20 is capable of performing carrier aggregation in which a plurality of cells (a plurality of CCs (component carriers)) are bundled to communicate with the base station 10. In carrier aggregation, one PCell (primary cell) and one or more SCell (secondary cells) are used. Also, a PUCCH-SCell having a PUCCH may be used.

[0019] FIG. 2 is a diagram for explaining an example (2) of a wireless communication system according to an embodiment of the present invention. FIG. 2 shows a configuration example of a wireless communication system when DC (Dual connectivity) is executed. As shown in FIG. 2, a base station 10A serving as an MN (Master Node) and a base station 10B serving as an SN (Secondary Node) are provided. The base station 10A and the base station 10B are each connected to a core network. The terminal 20 can communicate with both the base station 10A and the base station 10B.

[0020] A cell group provided by the base station 10A serving as the MN is called an MCG (Master Cell Group), and a cell group provided by the base station 10B serving as the SN is called an SCG (Secondary Cell Group). Also, in DC, the MCG is composed of one PCell and one or more SCells, and the SCG is composed of one PSCell (Primary SCG Cell) and one or more SCells.

[0021] Note that DC may be a communication method using two communication standards, and any combination of communication standards may be used. For example, the combination may be either NR and 6G standards or LTE and 6G standards. Also, DC may be a communication method using three or more communication standards and may be called by another name different from DC.

[0022] The processing operations in the present embodiment may be executed in the system configuration shown in FIG. 1, may be executed in the system configuration shown in FIG. 2, or may be executed in a system configuration other than these.

[0023] Here, in 6G, it is assumed that even higher frequencies than before will be used to further improve communication speed, capacity, reliability, latency performance, etc. For example, it is assumed that qualities such as ultra-high-speed communication on the order of tera bps, high reliability, and low latency at the optical communication level will be required. For example, when using a high frequency such as a terahertz wave, a super-wide bandwidth can be utilized, enabling high speed, and low latency can be achieved due to the short symbol length. On the other hand, it is assumed that the coverage will be narrowed due to the large attenuation rate, and the reliability will decrease due to the high directivity.

[0024] Due to the characteristics of the frequency band using the high frequency, it is important to ensure redundancy in order to provide services to the areas where 6G communication is required.

[0025] Therefore, instead of a MNO (Mobile network operator), it is being considered that users install access points (AP: Access point) and perform wireless communication between the AP and the UE. Hereinafter, the AP is also referred to as a configurable access point, C-AP. However, the name is not limited to this, and it may be a UE, or any communication device. Also, the MNO may install the C-AP instead of the user. Also, the device connected to the C-AP is not limited to the UE, and any communication device may be used.

[0026] FIG. 3 is a diagram showing an example of a network configuration in an embodiment of the present invention. As shown in FIG. 3, the AP is connected to the Internet via a fixed line and utilizes the high speed, high reliability, and low latency of optical communication. Alternatively, the AP may be connected to the Internet via wireless communication. The connection between the AP and the UE is made by 6G wireless communication. For example, it may be high-frequency wireless communication. The AP may be controlled by the MNO through wired communication via a fixed line, or may be controlled by the MNO through wireless communication (e.g., with a conventional base station). The control may be, for example, the On / Off of the C-AP, the setting of the wireless resources available to the C-AP, or the setting related to the communication between the C-AP and the UE.

[0027] As shown in FIG. 3, the U-plane connection of the UE may be established between the C-AP and the Internet, or the C-plane connection of the UE may be established between the C-AP and the BS (Base Station). Also, the UE may be capable of wireless communication with the BS. Note that the BS is connected to the core network.

[0028] FIG. 4 is a diagram showing an example of device connection in an embodiment of the present invention. As shown in FIG. 4, when establishing a connection between the C-AP and the MNO, wireless communication or wired communication is performed between a device 10A having a predetermined function corresponding to the C-AP and a device 10B that controls the device 10A. Hereinafter, the predetermined function is referred to as function X. Function X may be a function of controlling wireless communication with the terminal 20 or a function of performing wireless communication with the terminal 20. As shown in FIG. 4, a plurality of devices 10A may be connected to the device 10B.

[0029] The device 10A may be any of 1)-4) shown below.

[0030] 1) A base station device not included in the device 10B, for example, any one or a plurality of a CU (Central Unit), a DU (Distributed Unit), and an RU (Radio Unit), or a device corresponding to any PLMN (Public Land Mobile Network). 2) The device 10A may be a function or a system. 3) The device 10A may be any device, function, or system not provided by the device 10B. 4) The device 10A may be a UE, an AP, or an AP having a UE function, and is not limited thereto.

[0031] The device 10B may be any of 1)-4) shown below.

[0032] 1) It may be any one or more of a CU (Central Unit), a DU (Distributed Unit), and an RU (Radio Unit) that constitute a base station device, or it may be a device corresponding to any PLMN (Public Land Mobile Network). 2) Device 10B may be a function or a system. 3) Device 10B may be any device, function, or system provided by an MNO. 4) Device 10B may be a UE, may be an AP, or may be an AP equipped with UE functions, and is not limited thereto.

[0033] Terminal 20 may be a UE, may be device 10A, is not limited thereto, and may be any communication device. Terminal 20 can establish a connection in the PLMN to which device 10A belongs via device 10A.

[0034] The communication between device 10A and device 10B may be wireless communication via a predetermined frequency or may be wired communication. The wireless communication may be the same radio access technology (RAT: Radio Access Technology) as the wireless communication between device 10A and terminal 20, or may be a different RAT. The predetermined frequency may be the same frequency as the wireless communication between device 10A and terminal 20, or may be a different frequency. When device 10A communicates with device 10B, it may operate as a UE.

[0035] Connection establishment may be executed between device 10A and device 10B. FIG. 5 is a sequence diagram for explaining an example of connection establishment in an embodiment of the present invention. That is, device 10B may recognize device 10A. Note that at least one of the following steps may not be executed.

[0036] In step S101, device 10B may notify information requesting a signal from device 10A. Step S101 may or may not be executed. In step S102, device 10A transmits a signal notifying its existence and / or a connection request to device 10B.

[0037] In the subsequent step S103, device 10B identifies an individual based on the signal from device 10A. In the subsequent step S104, device 10B transmits a signal notifying connection permission and / or completion, or connection non - permission to device 10A. In the subsequent step S105, after receiving a signal related to connection permission and / or completion, device 10A transmits a confirmation response to device 10B. When steps S101 to S105 are completed, it may be determined that a connection has been established between device 10A and device 10B.

[0038] When establishing a connection, for example, in step S102 or step S105, the signal transmitted from device 10A to device 10B may include information related to any one or a plurality of the PLMN to be connected, the capabilities related to communication control of terminal 20, service types, communication request conditions, coverage area, location information, corresponding frequencies, antennas, and / or beam radio characteristics. The location information may be the location information of device 10A or the location information of terminal 20.

[0039] According to the connection status between device 10A and device 10B, the following predetermined operations 1) - 3) may be executed.

[0040] 1) Connection management and / or maintenance may be executed using a predetermined timer. For example, the transmission and reception of signals related to the connection may be performed periodically. For example, if the transmission and reception of a predetermined signal are not completed until the expiration of the predetermined timer, it may be determined that the connection has been lost.

[0041] 2) When the connection is lost, device 10A may stop function X.

[0042] 3) If the connection is lost, the device 10A may notify the subordinate terminal 20 to stop the function X. For example, the device 10A may stop the function X after a predetermined time has elapsed after the notification.

[0043] According to the above embodiment, a connection can be established between the C-AP and the device that controls the C-AP.

[0044] Predetermined information may be transmitted from the device 10A that is already connected to the device 10B to the device 10B. The predetermined information may be transmitted in at least one of before and during the operation of the device 10A as a C-AP. The operation as a C-AP may be wireless communication with the terminal 20 or an operation related to the function X.

[0045] FIG. 6 is a sequence diagram for explaining an example (1) of information reporting in the embodiment of the present invention. In step S200, a connection is established between the device 10A and the device 10B. In step S201, the device 10B transmits a signal requesting information to the device 10A. Step S201 may or may not be executed. In step S202, the device 10A transmits predetermined information to the device 10B. In the subsequent step S203, the device 10A may further transmit the predetermined information to the device 10B.

[0046] The transmission timing of the above predetermined information may be periodic, and the period may be predefined. Alternatively, the transmission timing of the above predetermined information may be set by the device 10B after the connection is completed. Also, the transmission timing of the above predetermined information may be the timing when the device 10A enables the function as a C-AP, that is, the function related to the wireless communication with the terminal 20, or the timing when the device 10A updates the function related to the wireless communication with the terminal 20. Also, the transmission timing of the above predetermined information may be the timing based on a request from the terminal 20.

[0047] The above predetermined information may be any one or more of 1)-4) shown below.

[0048] 1) Channel state. For example, it may be the target frequency, channel usage status, interference power value or level, other detectable devices 10A, information related to propagation characteristic measurement, etc.

[0049] 2) Service conditions. For example, it may be the service type, communication requirement conditions, coverage area, number of accommodated units, communication time, data volume, degree of achievement for requirements, etc.

[0050] 3) State of device 10A. For example, it may be position information, information related to GNSS (Global Navigation Satellite System), latitude and longitude, altitude, area formation angle, etc.

[0051] 4) Information related to the terminal 20 that can be connected when operating as a C-AP, that is, when enabling function X. For example, it may be the number of terminals 20, position information, information related to GNSS, latitude and longitude, altitude, area formation angle, etc.

[0052] All or part of the above-mentioned predetermined information may be selected as the information to be transmitted based on an instruction from device 10B or a determination by device 10A.

[0053] The acquisition of the above-mentioned predetermined information in device 10A may be performed based on a notification signal and / or a reference signal from device 10A, or signal transmission and reception may be executed among a plurality of devices 10A. Also, the acquisition of the above-mentioned predetermined information in device 10A may be performed based on a transmission signal and / or a reference signal from each terminal 20. For the acquisition of the above-mentioned predetermined information, limited communication between device 10A and terminal 20 may be permitted. After obtaining permission from device 10B, the limited communication may be executed. Also, the limited communication may be executed without obtaining permission from device 10B.

[0054] FIG. 7 is a sequence diagram for explaining an example (2) of information reporting in an embodiment of the present invention. Predetermined information may be transmitted from the terminal 20 to the device 10B. In step S301, the terminal 20 may transmit predetermined information to the device 10A. In subsequent step S302, the device 10A may transmit the received predetermined information to the device 10B. In subsequent step S303, the terminal 20 may further transmit predetermined information to the device 10B via the device 10A. Also, in step S311, the terminal 20 may transmit the predetermined information directly to the device 10B via wireless communication. As described above, the operation of transmitting directly from the terminal 20 to the device 10B via wireless communication may be limited to the case where the device 10A and the device 10B perform wireless communication.

[0055] The transmission timing of the above predetermined information may be periodic, and the period may be defined in advance. Alternatively, the transmission timing of the above predetermined information may be set by the device 10A or the device 10B. Also, the transmission timing of the above predetermined information may be timing based on a request from the device 10B to the terminal 20.

[0056] The above predetermined information may be any one or more of 1)-2) shown below.

[0057] 1) Channel state. For example, it may be a target frequency, channel usage status, interference power value or level, other detectable device 10A, information related to propagation characteristic measurement, etc.

[0058] 2) Evaluation related to the device 10A. For example, it may be an identification number of the device 10A, communication quality via the device 10A, degree of achievement of a request, etc.

[0059] The acquisition of the above-mentioned predetermined information at the terminal 20 may be performed based on a notification signal, a transmission signal, and a reference signal from the device 10A. For example, limited communication between the device 10A and the terminal 20 may be permitted for the acquisition of the above-mentioned predetermined information. After obtaining permission from the device 10B, the limited communication may be executed. Also, the limited communication may be executed without obtaining permission from the device 10B.

[0060] According to the above-described embodiment, after establishing a connection between the C-AP and the device that controls the C-AP, it is possible to notify the device that controls the C-AP from the C-AP of information related to the execution of the function X.

[0061] FIG. 8 is a sequence diagram for explaining an example of function activation in an embodiment of the present invention. The device 10A may receive a signal P related to the execution of the function X from the device 10B. In step S401, the device 10B transmits a signal P related to the execution of the function X, that is, a function of controlling the wireless communication of the terminal and a function of performing wireless communication with the terminal, to the device 10A.

[0062] It may be assumed that the device 10A can receive the signal P from the device 10B at any timing. That is, the signal P may be transmitted from the device 10B to the device 10A by an MNO trigger.

[0063] When the device 10A executes the function X, the device 10A may transmit a request for function activation or function update to the device 10B, and then receive the signal P from the device 10B. That is, the signal P may be transmitted from the device 10B to the device 10A by a C-AP trigger. Also, when the device 10A stops the execution of the function X, the device 10A may transmit a request for function deactivation to the device 10B, and then receive the signal P from the device 10B. When transmitting the request, the device 10A may report communication parameters and / or resources used to the device 10B. Note that the device 10A may be permitted to transmit the request to the device 10B only when a predetermined condition is satisfied.

[0064] When there is a device 10A that desires to execute function X, the terminal 20 may send a request to the device 10B to activate or update function X in the device 10A. That is, a signal P may be sent from the device 10B to the device 10A by a UE trigger. Also, when there is a device 10A that desires to stop the execution of function X, the terminal 20 may send a request to the device 10B to deactivate function X in the device 10A. When it is a UE trigger, the operation in the device 10A may be the same as when it is an MNO trigger. Note that the terminal 20 may be permitted to send the request to the device 10B only when a predetermined condition is satisfied. The request from the terminal 20 to the device 10B may be sent via a device 10A other than the device 10A that is the target of the request, or may be sent directly from the terminal 20 to the device 10B via wireless communication. The request may be sent directly from the terminal 20 to the device 10B via wireless communication only when wireless communication is performed between the device 10A and the device 10B.

[0065] When there is a device 10A that desires to execute function X, the terminal 20 may send a request to activate or update function X to the device 10A. The device 10A may receive a signal P from the device 10B by transferring the request to the device 10B. That is, a signal P may be sent from the device 10B to the device 10A by a UE trigger. Also, when there is a device 10A that desires to stop the execution of function X, the terminal 20 may send a request to stop function X to the device 10A. When it is a UE trigger, the operation in the device 10A may be the same as when it is an MNO trigger. Note that the terminal 20 may be permitted to send the request to the device 10A only when a predetermined condition is satisfied.

[0066] In the case of the above-described MNO trigger or C-AP trigger, at least a part of the procedures 1)-4) shown below may be applied.

[0067] 1) Information indicating the solicitation of device 10A having function X may be transmitted from device 10B to device 10A. Such information may be PHY signaling by PDCCH, signaling by MAC-CE (Media Access Control - Control Element) via PDSCH, or RRC signaling by RRC reconfiguration. Such information may be operation content, operation parameters, operation area or location, service requirements, service type, remuneration for the service, etc.

[0068] 2) Information indicating the candidacy of device 10A capable of activating function X may be transmitted from device 10A to device 10B. Such information may be PHY signaling by PUCCH in the form of RACH or SR (Scheduling Request), signaling by MAC-CE (Media Access Control - Control Element) via PUSCH, or RRC signaling by RRC reconfiguration request.

[0069] 3) Negotiation may be executed between device 10A and device 10B capable of activating function X. Such negotiation may relate to, for example, operation content, operation parameters, priority regarding future activation of function X, cost bearing or cost reduction regarding activation of function X, etc. Such negotiation may be PHY signaling by PDCCH and / or PUCCH, signaling by MAC-CE via PDSCH and / or PUSCH, or RRC signaling by RRC reconfiguration and / or reconfiguration request.

[0070] 4) For the device 10A that can enable Function X, an instruction to enable Function X may be sent from the device 10B to the device 10A. Such information may be PHY signaling by PDCCH, signaling by MAC-CE via PDSCH, or RRC signaling by an RRC reconfiguration request.

[0071] The radio resources required for the above signaling may be defined in the specification or set or notified from the device 10B.

[0072] The predetermined conditions that enable the transmission of the requests in the above C-AP trigger and UE trigger may be conditions based on any one or more of the following. For example, conditions based on PLMN, the capabilities of the device 10A, the capabilities of the terminal 20, service types, device groups, the location of the device 10A, the location of the terminal 20, the altitude of the device 10A, the RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), RSSI (Received Signal Strength Indicator) between the device 10A and the terminal 20, distance, the mobility level of the device 10A or the terminal 20, the device type of the device 10A or the terminal 20, category (normal, transport, drone, etc.).

[0073] The information included in the above signal P may be any one or more of 1)-4) shown below.

[0074] 1) An instruction to enable the function and communication parameters for the device 10A that has not executed Function X. The communication parameters may be a permission for the communication parameters reported from the device 10A to the device 10B. 2) A non-permission to enable the function for the device 10A that has not executed Function X. 3) An instruction to disable the function for the device 10A that is executing Function X. 4) Continuing instruction for enabling a function and update parameters for apparatus 10A during execution of function X. The update parameters may be permission for communication parameters reported from apparatus 10A to apparatus 10B.

[0075] Apparatus 10A that has received the signal P may perform any one or more of the operations 1)-2) shown below.

[0076] 1) Apparatus 10A may enable function X based on the received parameters (continue if already enabled) and start communication with terminal 20. 2) Apparatus 10A may disable function X and end communication with terminal 20. Before disabling function X, information indicating that function X is to be disabled may be notified to terminal 20. Terminal 20 that has received the notification may attempt to connect to another apparatus 10A or apparatus 10B.

[0077] The above operations may be performed after a predetermined time has elapsed from the timing when signal P was received from apparatus 10B.

[0078] The wireless communication parameters received by apparatus 10A from apparatus 10B may be any one or more of, for example, 1)-5) shown below.

[0079] 1) Parameters related to transmission timing 2) Available resources, for example, time, frequency, space, code 3) Available frequencies, for example, band, band combination, carrier component 4) Scheduling rules or constraints, for example, proportional fair type, latency aware type 5) Parameters related to transmission power control of apparatus 10A or terminal 20, beamforming (spatial filter, directivity)

[0080] FIG. 9 is a diagram for explaining an example (1) of recommended information transmission and reception in an embodiment of the present invention. As shown in FIG. 9, the device 10A may receive recommended or advisory information Q related to the installation of the device 10A from the device 10B. That is, it is assumed to be a recommendation or advice to the user who installs the C-AP.

[0081] The device 10A may receive the information Q in association with a notification of non-permission for function activation in the signal P. Further, the device 10A may receive the information Q in addition to the notification of non-permission for function activation. Further, the device 10A may receive the information Q in place of the notification of non-permission for function activation. That is, the reception of the information Q may mean non-permission for function activation.

[0082] The information Q may be transmitted from the device 10B and received by the device 10A based on a request from the device 10A. The request may be transmitted in addition to the predetermined information transmitted from the device 10A to the device 10B in step S202, or may be transmitted in place of the predetermined information. Further, the request may be a request for activation of function X or function update transmitted from the device 10A to the device 10B.

[0083] The information Q may be transmitted from the device 10B and received by the device 10A in association with an operation related to the establishment of the connection between the device 10A and the device 10B. The information Q may be transmitted in addition to the signal related to connection permission or completion, or may be transmitted in place of the signal related to connection permission or completion. That is, the reception of the information Q may mean connection permission or completion.

[0084] The information Q may be received by the device 10A from the device 10B even when the function X is activated. For example, the information Q may be received by the device 10A in conjunction with an operation related to function X continuation instruction and update parameter provision, or may be received by the device 10A in conjunction with an operation related to function X deactivation instruction, or may be received by the device 10A in place of an operation related to function X deactivation instruction.

[0085] FIG. 10 is a diagram for explaining an example (2) of recommended information transmission / reception in an embodiment of the present invention. Information Q may be any one or more of 1) to 5) shown below.

[0086] 1) It may be information related to propagation characteristic measurement values. For example, it may be RSRP, RSRQ, RSSI, etc. between device 10A and terminal 20, between device 10A and another device 10A, or between device 10A and device 10B.

[0087] 2) It may be information related to position as shown in FIG. 10. For example, it may be GNSS information, latitude and longitude, altitude, area formation angle, or information indicating which section when a plane is divided into predetermined sections (zones).

[0088] 3) It may be a signal to be received or measured. For example, it may be the type, series, ID, or resource of the signal.

[0089] 4) It may be information related to a transmission signal. For example, it may be a signal for acquiring predetermined information transmitted from device 10A to device 10B in step S202, and may be information related to signals between device 10A and terminal 20, between device 10A and device 10A, or between device 10A and device 10B. Also, for example, it may be the type, series, ID, frequency, resource, transmission power, beam (information related to TCI (Transmission Configuration Indicator) state, QCL (Quasi co-location)) of the signal.

[0090] 5) It may be information related to another device 10A. For example, it may be position, frequency, resource, transmission power, etc.

[0091] Device 10A may report the received information Q to a higher layer. For example, it may report to any of the MAC layer, RRC layer, RLC layer, PDCP layer, SDAP layer, and is not limited thereto. Also, it may be any layer higher than the PHY layer, and may report to the application layer. Device 10A may have a function of displaying information based on information Q on a predetermined screen. For example, the display function may be a function of notifying the user, which may be a voice notification, or a notification that turns on or blinks a predetermined display lamp.

[0092] Device 10A may execute control related to the transmission and / or reception of its own device based on the received information Q. The transmission may be a signal related to various status reports (e.g., an information signal and / or a reference signal from device 10A, or a transmission signal and / or a reference signal from each terminal 20), or a signal transmission when operating as function X. The control may be a change in service conditions (e.g., service type, communication requirement conditions, coverage area, accommodation number, communication time, data volume, degree of achievement of requirements, etc.). The control may also be a change in parameters used for transmission. For example, the change in the parameters may be related to type, series, ID, frequency, resource, transmission power reduction, beam (TCI state, QCL) limitation.

[0093] After the C-AP is installed based on information Q, device 10A may send a signal indicating completion of correspondence to device 10B. When device 10A detects that the conditions based on information Q are met, it may send the signal indicating completion of correspondence to device 10B. For example, when a predetermined propagation characteristic measurement value exceeds or falls below a threshold within a predetermined time interval, device 10A may send the signal indicating completion of correspondence to device 10B. After sending the signal indicating completion of correspondence to device 10B, operations related to the activation, deactivation, or update of function X may be applied to device 10A. Also, after sending the signal indicating completion of correspondence to device 10B, device 10A may receive a confirmation response from device 10B, and function X may be activated upon receiving the confirmation response.

[0094] According to the above embodiment, the device 10A that becomes a C-AP can know the conditions for enabling the function X, and the owner of the device 10A can install the device 10A in an appropriate manner.

[0095] FIG. 11 is a diagram for explaining an example (1) of initial access in an embodiment of the present invention. As shown in FIG. 11, communication related to connection may be executed between the device 10A executing the function X and the terminal 20. Connection establishment may be executed between the device 10A and the terminal 20, or connection establishment may be executed between the device 10B and the terminal 20 via the device 10A.

[0096] FIG. 12 is a sequence diagram for explaining an example (2) of initial access in an embodiment of the present invention. FIG. 12 is a sequence diagram showing connection establishment between the device 10A and the terminal 20. Note that some steps may not be executed from step S501 to step S505 shown in FIG. 12.

[0097] In step S501, the device 10A transmits a synchronization signal and a notification signal to the terminal 20. For example, step S501 may correspond to the transmission and reception of an SSB (SS / PBCH block) and an SIB. In the subsequent step S502, the terminal 20 transmits a signal notifying its presence or a connection request to the device 10A. For example, step S502 may correspond to the transmission and reception of a PRACH, a RAR (Random Access Response), and a Msg3. In the subsequent step S503, the device 10A identifies an individual based on the signal from the terminal 20.

[0098] In the subsequent step S504, the apparatus 10A transmits a signal notifying the terminal 20 of connection permission and / or completion, or connection non-permission. Step S504 may correspond to the transmission and reception of Msg4. In the subsequent step S505, after receiving the signal related to connection permission and / or completion, the terminal 20 transmits a confirmation response to the apparatus 10A. Step S505 may correspond to the transmission and reception of ACK. When up to step S505 is completed, it may be determined that the connection is established between the apparatus 10A and the terminal 20.

[0099] When connection establishment is executed between the apparatus 10A and the terminal 20, that is, when UL-CCCH (Common Control Channel) messages (for example, RRC setup request), DL-CCCH messages (RRC setup), UL-DCCH (Dedicated Control Channel) messages (for example, RRC setup completion) are transmitted and received between the apparatus 10A and the terminal 20, in the above-mentioned initial access, information related to the terminal 20 may be transmitted from the apparatus 10A to the apparatus 10B. Also, information related to connection permission or non-permission may be transmitted from the apparatus 10B to the apparatus 10A. The apparatus 10A may execute step S504 based on the said information.

[0100] FIG. 13 is a sequence diagram for explaining an example (3) of initial access in an embodiment of the present invention. In FIG. 13, connection establishment is performed between the apparatus 10B and the terminal 20 via the apparatus 10A. When connection establishment is performed between the apparatus 10B and the terminal 20, that is, when UL-CCCH messages (for example, RRC setup request), DL-CCCH messages (RRC setup), UL-DCCH messages (for example, RRC setup completion) are transmitted and received between the apparatus 10B and the terminal 20, in the initial access, after all the information related to connection establishment (for example, RRC setup) is received by the apparatus 10A, the apparatus 10A may transmit information related to collision resolution (for example, Msg4) to the terminal 20.

[0101] In step S601, device 10B sends a notification to activate function X to device 10A. In the subsequent step S602, device 10A sends a synchronization signal and a notification signal (e.g., SSB and SIB) to terminal 20. In the subsequent step S603, terminal 20 sends a PRACH to device 10A. In the subsequent step S604, device 10A sends an RAR to terminal 20. In the subsequent step S605, terminal 20 sends a Msg3 to device 10A. In the subsequent step S606, device 10A sends an RRC setup request based on the received Msg3 to device 10B. Note that PRACH, RAR, and Msg3 are not limited to these, and any signal or transmission or reception related to a connection request that notifies device 10A of the existence from terminal 20 may be used.

[0102] In the subsequent step S607, device 10B sends an RRC setup (i.e., all information related to connection establishment) to device 10A. In the subsequent step S608, device 10A sends a Msg4 to terminal 20 based on the received RRC setup. Note that the RRC setup and Msg4 are not limited to these, and any signal that notifies connection permission and / or completion, or connection non - permission to terminal 20 may be used. In step S608, collision resolution is successful and the random access procedure is completed. In the subsequent step S609, terminal 20 sends an ACK to device 10A. In the subsequent step S610, device 10A sends an RRC configuration to terminal 20. Step S610 may be repeated for necessary RRC configurations. In step S611, terminal 20 sends an ACK to device 10A. In the subsequent step S612, device 10A sends an RRC setup completion to device 10B. The RRC configuration is completed in step S612.

[0103] Here, the service type or service requirements may be notified by the SSB, SIB, or RAR. Also, the TC-RNTI (Temporary Cell - Radio Network Temporary Identifier), UL grant, and TA (Timing Advance) command may be notified by the RAR. The TC-RNTI may be notified from the device 10B to the device 10A when the function X is enabled, or may be notified between the PRACH and the RAR. Also, the interference level report may be performed by Msg3 (MAC-PDU (Protocol data unit)). Further, all or part of the information included in the RRC setup and the information included in the RRC configuration may be the same or different.

[0104] FIG. 14 is a sequence diagram for explaining an example (4) of initial access in an embodiment of the present invention. In FIG. 14, connection establishment is performed between the device 10B and the terminal 20 via the device 10A. When connection establishment is performed between the device 10B and the terminal 20, that is, when UL-CCCH messages (e.g., RRC setup request), DL-CCCH messages (RRC setup), and UL-DCCH messages (e.g., RRC setup complete) are transmitted and received between the device 10B and the terminal 20, in the initial access, the device 10A may transmit information related to collision resolution (e.g., Msg4) to the terminal 20 at a stage when at least part of the information related to connection establishment (e.g., RRC setup) is received. Note that when connection establishment is performed between the device 10B and the terminal 20 via the device 10A, the procedure related to the initial access shown in FIG. 13 may be executed, or the procedure related to the initial access shown in FIG. 14 may be executed.

[0105] In step S701, device 10B sends a notification to activate function X to device 10A. In the subsequent step S702, device 10A sends a synchronization signal and a notification signal (e.g., SSB and SIB) to terminal 20. In the subsequent step S703, terminal 20 sends a PRACH to device 10A. In the subsequent step S704, device 10A sends an RAR to terminal 20. In the subsequent step S705, terminal 20 sends Msg3 to device 10A. In the subsequent step S706, device 10A sends an RRC setup request based on the received Msg3 to device 10B. Note that PRACH, RAR, and Msg3 are not limited to these, and any signal or transmission / reception related to a connection request that notifies the existence from terminal 20 to device 10A is acceptable.

[0106] In the subsequent step S707, device 10B sends an RRC setup (a part, i.e., a part of the information related to connection establishment) to device 10A. In the subsequent step S708, device 10A sends Msg4 to terminal 20 based on the received RRC setup. Note that the RRC setup and Msg4 are not limited to these, and any signal that notifies connection permission and / or completion, or connection non - permission to terminal 20 is acceptable. Collision resolution is successful in step S708 and the random access procedure is completed. In the subsequent step S709, terminal 20 sends an ACK to device 10A. In the subsequent step S710, device 10A sends an ACK report to device 10B. In the subsequent step S711, device 10B sends an RRC setup (i.e., the remaining information related to connection establishment) to device 10A. In the subsequent step S712, device 10A sends an RRC configuration to terminal 20. Steps S711 and S712 may be repeated for the necessary RRC configuration. In step S713, terminal 20 sends an ACK to device 10A. In the subsequent step S714, device 10A sends an RRC setup completion to device 10B. The RRC configuration is completed in step S714.

[0107] Here, the service type or service requirements may be notified by the SSB, SIB, or RAR. Also, the TC-RNTI, UL grant, and TA command may be notified by the RAR. The TC-RNTI may be notified from the apparatus 10B to the apparatus 10A when the function X is enabled, or may be notified between the PRACH and the RAR. Also, the interference level report may be performed by Msg3 (MAC-PDU). Also, the ACK report may be performed via the PUCCH or PUSCH (MAC-PDU). Also, all or part of the information included in the RRC setup and the information included in the RRC configuration may be the same or different.

[0108] FIG. 15 is a diagram for explaining an example (5) of initial access in an embodiment of the present invention. As shown in FIG. 15, based on a signal transmitted from the apparatus 10B to the apparatus 10A, a signal related to connection permission or completion may be transmitted from the apparatus 10A to the terminal 20.

[0109] First, the apparatus 10A and the terminal 20 connect to the apparatus 10B. Next, the terminal 20 requests a connection to the apparatus 10A from the apparatus 10B. Next, the apparatus 10B instructs or requests the apparatus 10A to establish a connection with the terminal 20. Next, the apparatus 10A transmits a signal notifying the terminal 20 of connection permission or completion, or connection non-permission. Next, after receiving the signal related to connection permission or completion, the terminal 20 transmits a confirmation response to the apparatus 10A and / or the apparatus 10B.

[0110] FIG. 16 is a diagram for explaining an example (6) of initial access in an embodiment of the present invention. As shown in FIG. 16, based on a signal transmitted from the apparatus 10B to the terminal 20, a signal related to connection permission or completion may be transmitted from the apparatus 10B to the apparatus 10A and the terminal 20.

[0111] First, device 10A and terminal 20 are connected to device 10B. Next, terminal 20 requests a connection to device 10A from device 10B. Next, device 10B transmits a signal notifying device 10A and terminal 20 of connection permission or completion, or connection non - permission. Next, after receiving a signal related to connection permission or completion, terminal 20 transmits a confirmation response to device 10A and / or device 10B.

[0112] In the communication related to the connection between device 10A executing the above - mentioned function X and terminal 20, the signal transmitted from device 10A may include the following. For example, PLMN information, the capabilities of device 10A related to the communication control of terminal 20, the capabilities of terminal 20 that device 10A can support, the type of service to be provided, the required conditions for achievable communication, the provided frequency, the device group that can be accommodated, the number of terminals 20 that can be accommodated, the number of terminals 20 that have been accommodated, the resource utilization status, etc. may be included. The destination of the signal may be another device 10A, device 10B, or terminal 20.

[0113] In the communication related to the connection between device 10A executing the above - mentioned function X and terminal 20, the signal transmitted from terminal 20 may include the following. For example, PLMN information, the capabilities of its own device, the type of service requested, the required conditions for communication, the frequencies that can be supported, the device group, etc. may be included. The destination of the signal may be device 10A, device 10B, or another terminal 20.

[0114] Terminal 20 may be able to transmit a connection request to device 10A and / or device 10B only when a predetermined condition is satisfied. The predetermined condition may be a condition based on the information related to the synchronization signal and / or notification signal received from device 10A. For example, the information may be PLMN information, capabilities, service type, device group, the position of device 10A or terminal 20, the altitude of device 10A or terminal 20, the RSRP, RSRQ, RSSI, or distance between device 10A and terminal 20, etc. Also, the predetermined condition may be, for example, that terminal 20 is included in the device group indicated by the synchronization signal and / or notification signal.

[0115] Device 10A may be configured to send a connection permission or completion notification to terminal 20 only when a predetermined condition is satisfied. If the predetermined condition is not satisfied, a connection denial may be notified to terminal 20. The predetermined condition may be a condition based on information in the signal received from terminal 20. The information may be, for example, PLMN information, the capabilities of the own device, the type of service requested, the communication request conditions, the frequencies that can be supported, the device group, the location of device 10A or terminal 20, the altitude of device 10A or terminal 20, the RSRP, RSRQ, RSSI, or the distance between device 10A and terminal 20, etc. Also, for example, when device 10A can provide the type of service requested by terminal 20, device 10A may send a connection permission or completion to terminal 20. Also, for example, if terminal 20 does not receive a connection permission signal from device 10A within a predetermined time, it may be assumed that the connection to device 10A is not permitted.

[0116] An operation related to connection termination may be executed between device 10A and terminal 20. For example, device 10A may notify terminal 20 of connection termination. For example, terminal 20 may notify device 10A of connection termination. For example, terminal 20 may notify device 10B of connection termination. For example, device 10A may notify device 10B of connection termination.

[0117] Certain information may be notified by the connection termination notification. For example, the certain information may be the time until connection termination.

[0118] When a predetermined condition is satisfied, connection termination may be notified. For example, connection termination may be notified when the transmission data has run out or when a certain time has elapsed since the transmission data has run out.

[0119] A response may be sent in response to receiving a connection termination notification. If the response is ACK, it may be considered that connection termination is permitted. If the response is NACK, it may be considered that connection termination is not permitted, and the connection may be maintained.

[0120] According to the above embodiments, a communication partner for performing a service to be realized can be determined, and establishment of communication for service execution becomes possible.

[0121] The terminal 20 may execute communication with a plurality of devices 10A. The plurality of devices 10A that communicate with a certain terminal 20 may be determined by any one of the following methods 1)-3).

[0122] 1) FIG. 17 is a diagram for explaining an example (1) of connection with a plurality of devices in an embodiment of the present invention. As shown in FIG. 17, the device 10A that communicates with the terminal 20 may be determined by the device 10A based on information sharing among the devices 10A. A main device 10A may be determined, and the terminal 20 may connect to the main device 10A. The main device 10A may perform information sharing with other devices 10A and determine a sub-device 10A that communicates with the terminal 20. The main device 10A may execute addition and deletion of the sub-device 10A. Along with handover, the main device 10A may be changed. That is, the device 10A at the handover destination may be changed to the main one. A wireless or wired interface for information sharing among the devices 10A may be defined.

[0123] 2) FIG. 18 is a diagram for explaining an example (2) of connection with a plurality of devices in an embodiment of the present invention. As shown in FIG. 18, for the device 10A that communicates with the terminal 20, the device 10A may share information with the device 10B, and the device 10B may make a decision based on the information. That is, the device 10A may receive an instruction related to the decision from the device 10B. The device 10A may report information related to its own communication status and the connection status of the terminal 20 to the device 10B. The device 10A may request the device 10B to permit cooperation with a specific device 10A. The device 10A may receive from the device 10B an instruction to communicate in cooperation with a specific device 10A and parameters related to the communication for a certain terminal 20. The device 10B may instruct a cooperation method among a plurality of devices 10A described later. The device 10A may perform information sharing related to cooperation with the specific device 10A. For example, the method in the above example (1) of connection with the plurality of devices may be applied. Without being limited to a certain terminal 20, cooperation among the device 10A may be executed for communication with all terminals 20.

[0124] 3) FIG. 19 is a diagram for explaining an example (3) of connection with a plurality of devices in an embodiment of the present invention. As shown in FIG. 19, among the devices 10A that can be detected by the terminal 20, a plurality of devices 10A with which the terminal 20 communicates may be determined. Based on the signal strength from each device 10A and the information received from each device 10A, the terminal 20 may instruct cooperation for the plurality of devices 10A. The terminal 20 reports information related to cooperation to the device 10B or requests cooperation, and based on the report or request, an instruction for cooperation may be transmitted from the device 10B to the device 10A. The terminal 20 may instruct a cooperation method among a plurality of devices 10A described later. Instructions related to a plurality of devices 10A transmitted from a certain terminal 20 may be applied to communication between another terminal 20 and the plurality of devices 10A. The communication for instructing cooperation from the terminal 20 to the device 10A may be performed at a frequency for data transmission and reception (for example, a serving cell, a carrier, etc.), or may be performed at another frequency or RAT.

[0125] FIG. 20 is a diagram for explaining an example (4) of connection with a plurality of devices in an embodiment of the present invention. As shown in FIG. 20, the plurality of devices 10A and the terminal 20 may perform data transmission and reception in the same frequency band (for example, a serving cell, a carrier, etc.). That is, a configuration that becomes a multi-TRP (Transmission Reception Point) may be adopted.

[0126] Different data may be transmitted from the terminal 20 to each device 10A in the same frequency band, and different data may be transmitted from each device 10A to the terminal 20 in the same frequency band. That is, as shown in FIG. 20, transport block (TB) #1 and TB #2 may be transmitted to the terminal 20 on 1CC. The different data may be multiplexed by any one or a plurality of TDM (Time division multiplexing), FDM (Frequency division multiplexing), SDM (Space division multiplexing), and CDM (Code division multiplexing). Also, the resource allocation information used for the transmission may be shared between each device 10A and the terminal 20. The control information may be transmitted from each device 10A to the terminal 20, or may be transmitted from a certain device 10A to the terminal 20 collectively. HARQ feedback for each device 10A may be performed for each device 10A, or may be performed for a certain device 10A collectively.

[0127] FIG. 21 is a diagram for explaining an example (5) of connection with a plurality of devices in an embodiment of the present invention. As shown in FIG. 21, the plurality of devices 10A and the terminal 20 may perform data transmission and reception in the same frequency band (for example, a serving cell, a carrier, etc.). That is, a configuration that becomes a multi-TRP (Transmission Reception Point) may be adopted.

[0128] The same data may be transmitted from the terminal 20 to each device 10A in the same frequency band, and the same data may be transmitted from each device 10A to the terminal 20 in the same frequency band. That is, as shown in FIG. 21, TB#1 and TB#1 may be transmitted to the terminal 20 on 1CC. The same data may be multiplexed by any one or more of TDM, FDM, SDM, and CDM. Also, certain data may be transmitted from a certain device 10A to another device 10A, and may be transmitted from the certain device 10A and the other device 10A to the terminal 20. The control information may be transmitted from each device 10A to the terminal 20, or may be transmitted from a certain device 10A to the terminal 20 collectively. The HARQ feedback for each device 10A may be performed for each device 10A, or may be performed for a certain device 10A collectively. The terminal 20 may determine that the data signals received from a plurality of devices 10A are signals related to the same data, or may synthesize the received plurality of data signals and determine the success or failure of reception or decoding.

[0129] FIG. 22 is a diagram for explaining an example (6) of connection with a plurality of devices in an embodiment of the present invention. The terminal 20 may perform data transmission and reception with a plurality of devices 10A in different frequency bands (for example, a serving cell, a carrier). That is, carrier aggregation or dual connectivity may be executed via a plurality of devices 10A.

[0130] For example, when the device 10A that communicates with the terminal 20 is determined by the device 10A, the main device 10A may determine the C-SpCell (Configurable Special Cell) shown in FIG. 22. The SpCell may be a cell defined in the same manner as the SpCell in NR. When there are a plurality of cells formed by the main device 10A, the device 10B may determine the C-SpCell, or the device 10A may determine it. When the device 10B determines the C-SpCell, it may be notified to the device 10A by the index of the CC.

[0131] When the device 10A determines the C-SpCell, the C-SpCell may be determined based on the information of the terminal 20. For example, it may be determined as the cell with the maximum RSRP, RSRQ, and RSSI in the cell formed by the terminal 20 and the device 10A, or it may be determined as the cell that satisfies the buffer size of the BSR (Buffer Status Report), or it may be determined as the cell that supports the service type or priority, or the cell may be determined based on the configurable band, band combination, FR (Frequency Range), UE type, UE category, capability, and connection status.

[0132] When the device 10A determines the C-SpCell, the C-SpCell may be determined based on the information of the CC. For example, the C-SpCell may be determined based on the number of PRBs, TDD configuration, supported service type, cell utilization rate, etc. Also, the device 10A may determine the cell with the number of connected devices less than the threshold K as the C-SpCell.

[0133] The device 10A may notify the terminal 20 of the determined C-SpCell. For example, the device 10A may implicitly notify the terminal 20 by transmitting a synchronization signal, or may explicitly notify the terminal 20 by means of PHY signaling, MAC signaling, RRC signaling, etc. The PHY signaling may be a DCI field, DCI format, CORESET, search space (SS), scrambling RNTI. The MAC signaling may be a MAC-CE. The RRC signaling may be an RRC parameter.

[0134] FIG. 23 is a diagram for explaining an example (7) of connection with a plurality of devices in an embodiment of the present invention. For example, when device 10B determines device 10A that communicates with terminal 20, device 10B may determine the C-SpCell shown in FIG. 23. Device 10A may receive an instruction from device 10B indicating which cell is to be the C-SpCell, or may be notified by device 10B with the index of the CC. For example, when device 10A determines the C-SpCell, device 10A may be instructed by device 10B with information indicating which device 10A determines the C-SpCell. When device 10A determines the C-SpCell, the method described with reference to FIG. 22 may be applied.

[0135] FIG. 24 is a diagram for explaining an example (8) of connection with a plurality of devices in an embodiment of the present invention. For example, when terminal 20 determines device 10A that communicates with terminal 20, terminal 20 may determine the C-SpCell shown in FIG. 24. When terminal 20 determines the C-SpCell, it may be determined which cell is to be the C-SpCell based on the connection order of terminal 20. Also, when terminal 20 determines the C-SpCell, it may be determined which cell is to be the C-SpCell based on information from device 10A. The information may be RSRP, RSRQ, RSSI, transmission buffer size, configurable band / band combination / FR, UE type, UE category, capability, number of PRBs, TDD setting, supported service type, cell utilization rate, etc.

[0136] When the terminal 20 determines the C-SpCell, it may notify the determined C-SpCell to the device 10A. For example, it may be explicitly notified to the device 10A by means such as PHY signaling, MAC signaling, RRC signaling, etc. The PHY signaling may be a DCI field, a DCI format, a CORESET, an SS, or a scrambling RNTI. The MAC signaling may be a MAC-CE. The RRC signaling may be an RRC parameter. The C-SpCell may be determined by the device 10A or the device 10B, and the method described with reference to FIG. 22 or FIG. 23 may be applied.

[0137] The additional or control method related to the C-SCell may be any of 1)-5) shown below. The C-SCell may be a cell defined in the same way as the SCell in NR.

[0138] 1) Activation or deactivation may be explicitly notified by signaling such as PHY, MAC, or RRC from the device 10A to the terminal 20, from the terminal 20 to the device 10A, or from the device 10B to the device 10A and the terminal 20. That is, any of the device 10A, the device 10B, and the terminal 20 may determine whether to add the C-SCell.

[0139] 2) The C-SCell formed by the device 10A that forms the C-SCell may always be active.

[0140] 3) Based on the information between the device 10A and the terminal 20, the C-SCell may be activated or deactivated. For example, the C-SCell may be activated if the RSRP, RSRQ, or RSSQ exceeds X dBm, or may be deactivated if it is below Y dBm. Also, the C-SCell may be activated when Tx milliseconds have elapsed since the RSRP, RSRQ, or RSSQ exceeded X dBm, or may be deactivated when Ty milliseconds have elapsed since it dropped below Y dBm. Further, the C-SCell may be activated if the buffer size of the BSR is M or more (the buffer size level or index is N or more), or may be deactivated if it is less than M.

[0141] Also, the C-SCell may be activated when communication of a specific service type or priority is required. Further, the C-SCell may be activated or deactivated based on the configurable number of CCs, band, band combination, FR, UE type, and UE category. Also, the C-SCell may be activated or deactivated based on the UE capabilities and connection status (e.g., connection to other UEs or gNBs).

[0142] 4) Based on the information of the C-SpCell and / or C-SCell, it may be activated or deactivated. For example, the C-SCell may be activated or deactivated based on the number of PRBs, TDD configuration, supported service type, and cell utilization rate. Also, for example, the C-SCell may be activated if the number of connected devices is K or more, or may be deactivated if it is less than K.

[0143] 5) The C-SCell may be deactivated after a specific time has elapsed since activation.

[0144] Note that C-SpCell may be a cell in which a specific signal can be transmitted and received, or a cell in which a specific operation is executed, among the CCs that can be used by device 10A, and the name is not limited to this. For example, among the CCs that can be used by device 10A, a CC in which a synchronization signal (SS), PBCH, PRACH, PUCCH, or PSFCH can be transmitted and received may be a C-SpCell. Also, for example, among the CCs that can be used by device 10A, a CC in which fallback scheduling or initial access can be executed may be a C-SpCell.

[0145] Note that C-SCell may be a cell that can be additionally used among the CCs that can be used by device 10A, and the name is not limited to this. Activation or deactivation may be replaced with switching. Note that the above cells may be replaced with BWP or resource pools.

[0146] FIG. 25 is a diagram for explaining an example (9) of connection with a plurality of devices in an embodiment of the present invention. As shown in FIG. 25, terminal 20 may change the connection destination from one device 10Aa to another device 10Ab and execute data transmission and reception. That is, handover may be executed.

[0147] Terminal 20 may monitor signals from a plurality of devices 10A. When terminal 20 controls an operation related to handover, terminal 20 may simultaneously establish the above-described connection with a plurality of devices 10A. Terminal 20 may execute connection establishment with device 10Ab based on the connection status with device 10Aa. For example, when terminal 20 performs an operation related to the end of connection with device 10Aa (for example, when performing the operation related to the end of connection described above), terminal 20 may perform connection establishment with device 10Ab. Also, for example, when the RSRP, RSRQ, or RSSI between terminal 20 and device 10Aa falls below a threshold X times or below a threshold for a certain period, terminal 20 may perform connection establishment with device 10Ab. Terminal 20 may execute the end of connection with device 10Aa based on the connection status with device 10Ab.

[0148] FIG. 26 is a diagram for explaining an example (10) of connection with a plurality of devices in an embodiment of the present invention. As shown in FIG. 26, the terminal 20 may change the connection destination from a certain device 10Aa to another device 10Ab and execute data transmission and reception. That is, handover may be executed.

[0149] When the device 10A controls the operation related to handover, the terminal 20 may report the monitoring status of signals from each device 10A to the device 10Aa. The device 10Aa may communicate with the device 10Ab based on the information received from the terminal 20. For example, through the communication, handover requests, responses, and information related to the terminal 20 (such as ID, UE capabilities, etc.) may be shared. The device 10Ab may communicate with the device 10Aa based on the information received from the terminal 20. For example, through the communication, handover requests, responses, and information related to the terminal 20 (such as ID, UE capabilities, etc.) may be shared.

[0150] The device 10Ab may communicate with the terminal 20 based on the information received from the device 10Aa or the terminal 20. For example, through the communication, a connection (handover) notification to the terminal 20 and a response may be made. The device 10Aa may communicate with the terminal 20 based on the information received from the device 10Ab or the terminal 20. For example, through the communication, a connection (handover) notification to the terminal 20 and a response may be made.

[0151] The C-AP intercommunication related to handover control and the like may be executed as shown in 1)-3) below.

[0152] 1) The communication between the devices 10A may be executed via the device 10B or may be executed by direct communication between the devices 10A.

[0153] 2) The direct communication between devices 10 may be sidelink communication. For such sidelink communication, dedicated resources may be used, or resources may be configured from device 10B. The resources may be autonomously selected by device 10A or determined based on an instruction from device 10B. A connection (e.g., PC5 - RRC connection) may be established between device 10A. The device 10Ab to which device 10Aa is to communicate may be notified from device 10B or detected by device 10Aa through sidelink communication.

[0154] Data relay between C - APs may be performed as shown in 1) - 5) below.

[0155] 1) Data addressed to terminal 20 may be transmitted from device 10Aa to device 10Ab (or from device 10Ab to device 10Aa). 2) Device 10Aa or device 10Ab may transmit the data relayed to terminal 20. 3) A connection may or may not be established between terminal 10Aa and terminal 20. 4) The data transmission from device 10Aa to device 10Ab (or from device 10Ab to device 10Aa) may be performed by any of the above C - AP - to - C - AP communications. 5) In conjunction with the data transmission from device 10Aa to device 10Ab (or from device 10Ab to device 10Aa), control information related to the data transmission to terminal 20 may be notified. The control information may be applied to operations where data transmission and reception are performed in the same frequency band by multiple devices 10A.

[0156] According to the above embodiments, it becomes possible for a plurality of C - APs and UEs to connect, and it becomes possible to improve reliability and throughput.

[0157] When a predetermined condition is satisfied, the device 10A may activate function X and then operate autonomously without being controlled by the device 10B. The predetermined condition may also be the case where the device 10A transitions to a state where it can activate function X. That is, in a system without the device 10B, the device 10A may activate function X and operate autonomously.

[0158] The predetermined condition may also be the case where a predetermined notification is received from the device 10B or another device 10C. FIG. 27 is a diagram for explaining an example (1) of the operation related to the emergency notification in the embodiment of the present invention. As shown in FIG. 27, when the device 10A receives a signal related to an emergency (for example, the occurrence of a disaster), it may activate function X and operate autonomously.

[0159] Also, when the device 10A receives a signal that permits the activation of function X for all devices 10A, it may activate function X and operate autonomously. The above-mentioned other device 10C may be a device having the authority to transmit a signal that permits the activation of function X for all PLMNs without being limited to a specific PLMN.

[0160] The predetermined condition may also be the case where, after receiving a predetermined notification from another device (for example, the device 10A, the terminal 20, etc.), if a predetermined notification is not received from the device 10B, it may activate function X and operate autonomously. FIG. 28 is a diagram for explaining an example (2) of the operation related to the emergency notification in the embodiment of the present invention. As shown in FIG. 28, the device 10A in a situation where the communication path with the device 10B is blocked may receive a signal related to an emergency (for example, the occurrence of a disaster) from another device. Also, when the device 10A receives a signal that requests the activation of function X for some or all of the devices 10A from another device, it may activate function X and operate autonomously.

[0161] When operating autonomously, the operation details or communication parameters related to Function X may be notified from Device 10B to Device 10A via a predetermined notification that is the trigger for the operation. Also, the operation details or communication parameters related to Function X when operating autonomously may be determined by Device 10A without relying on Device 10B.

[0162] When operating autonomously, the operation details or communication parameters related to Function X may be different from the operation when receiving control from Device 10B. For example, it may exchange information with another Device 10A and autonomously change the communication parameters based on the information. Also, the communication parameters related to Function X when operating autonomously may be defined by the specifications or may be, for example, a fallback operation. Further, when receiving a predetermined notification from Device 10B during the execution of the operation related to Function X when operating autonomously, it may shift to the state of invalidating Function X or activating Function X under the control of Device 10B.

[0163] According to the above-described embodiments, even in a situation where the control by Device 10B is not executed, when the communication environment by Device 10A is desired, the communication by Device 10A becomes possible.

[0164] According to the above-described embodiments, a connection can be established between the C-AP and the device that controls the C-AP, and the communication of the UE in the target PLMN can be executed via the C-AP.

[0165] That is, in a radio communication system, the redundancy of the network can be ensured.

[0166] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described so far will be described. The base station 10 and the terminal 20 include the functions for executing the above-described embodiments. However, the base station 10 and the terminal 20 may each be provided with only the functions of any one of the proposals in the embodiments.

[0167] <Base Station 10> FIG. 29 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. 29, the base station 10 includes a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in FIG. 29 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and the names of the functional units can be anything. The transmission unit 110 and the reception unit 120 may be referred to as a communication unit.

[0168] The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The reception unit 120 includes a function of receiving various signals transmitted from the terminal 20 and obtaining information of, for example, a higher layer from the received signals. Further, the transmission unit 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. Further, the transmission unit 110 transmits the setting information etc. described in the embodiments.

[0169] The setting unit 130 stores setting information set in advance and various setting information to be transmitted to the terminal 20 in a storage device and reads it out from the storage device as necessary. The control unit 140 performs control of the entire base station 10 including, for example, control related to signal transmission / reception and control related to LBT. Note that the functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120. Further, the transmission unit 110 and the reception unit 120 may be referred to as a transmitter and a receiver, respectively.

[0170] <Terminal 20> FIG. 30 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. 30, the terminal 20 includes a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in FIG. 30 is merely an example. As long as the operations according to the embodiments of the present invention can be executed, the functional divisions and the names of the functional units can be anything. The transmission unit 210 and the reception unit 220 may be referred to as a communication unit.

[0171] The transmitting unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and obtains signals of a higher layer from the received physical layer signals. Also, the transmitting unit 210 transmits HARQ-ACK, and the receiving unit 220 receives the setting information and the like described in the embodiments.

[0172] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in the storage device and reads it out from the storage device as necessary. Also, the setting unit 230 stores preset setting information. The control unit 240 performs overall control of the terminal 20 including control related to signal transmission and reception and control related to LBT. Note that a functional unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and a functional unit related to signal reception in the control unit 240 may be included in the receiving unit 220. Also, the transmitting unit 210 and the receiving unit 220 may be referred to as a transmitter and a receiver, respectively.

[0173] (Hardware Configuration) The block diagrams (FIGS. 29 and 30) used in the description of the above embodiments show blocks of functional units. These functional blocks (constituent parts) are realized by an arbitrary combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (for example, using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0174] Functions include, but are not limited to, judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), assigning, etc. For example, a functional block (component) that enables transmission is referred to as a transmitting unit or a transmitter. As described above, the implementation method is not particularly limited.

[0175] For example, the base station 10, the terminal 20, etc. in an embodiment of the present disclosure may function as a computer that performs the processing of the wireless communication method of the present disclosure. FIG. 31 is a diagram showing an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. Physically, the above-described base station 10 and terminal 20 may be configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0176] Note that in the following description, the term "device" can be read as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without including some devices.

[0177] Each function in the base station 10 and the terminal 20 is realized by causing the processor 1001 to perform operations by loading a predetermined software (program) onto hardware such as the processor 1001 and the storage device 1002, and controlling the communication by the communication device 1004, or controlling at least one of reading and writing data in the storage device 1002 and the auxiliary storage device 1003.

[0178] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be composed of a central processing unit (CPU: Central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the above-described control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0179] Also, the processor 1001 reads a program (program code), software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes according to these. As the program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 140 of the base station 10 shown in FIG. 29 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in FIG. 30 may be stored in the storage device 1002 and realized by a control program operating on the processor 1001. Although it has been described that the above various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be mounted by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0180] The storage device 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The storage device 1002 may be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store a program (program code), a software module, etc. executable for implementing the communication method according to an embodiment of the present disclosure.

[0181] The auxiliary storage device 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The above-described storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0182] The communication device 1004 is hardware (a transceiver 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, etc. The communication device 1004 may include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of frequency-division duplexing (FDD) and time-division duplexing (TDD). For example, a transceiver antenna, an amplifier unit, a transceiver unit, a transmission line interface, etc. may be implemented by the communication device 1004. The transceiver unit may be physically or logically separated into a transmission unit and a reception unit.

[0183] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives an external input. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs an output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (e.g., a touch panel).

[0184] Also, each device such as the processor 1001 and the storage device 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 different buses for each device.

[0185] Further, the base station 10 and the terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0186] (Summary of Embodiment) As described above, according to the embodiment of the present invention, there is provided a communication device including a transmission unit that transmits a connection request to a first communication device, a reception unit that receives a connection permission from the first communication device, and a control unit that establishes a first connection with the first communication device, and the control unit controls communication of a second communication device.

[0187] With the above configuration, a connection can be established between the C-AP and the device that controls the C-AP, and communication of the UE in the target PLMN can be executed via the C-AP. That is, in a radio communication system, the redundancy of the network can be ensured.

[0188] The control unit may establish a second connection with the Internet and establish a user plane connection of the second communication device by the second connection. With this configuration, communication of the UE in the target PLMN can be executed via the C-AP.

[0189] The connection request may include the location information of the own device or the second communication device. With this configuration, a connection can be established between the C-AP and the device that controls the C-AP in consideration of the location information of the C-AP or the terminal.

[0190] The control unit manages the first connection using a timer, and may determine that the first connection has been disconnected if the transmission and reception of signals with the first communication device have not been completed until the timer expires. With this configuration, the connection between the C-AP and the device that controls the C-AP can be managed using a timer.

[0191] When the first connection is disconnected, the transmission unit may notify the second communication device to stop the function of controlling the wireless communication with the second communication device and the function of performing the wireless communication with the second communication device. With this configuration, when the connection between the C-AP and the device that controls the C-AP is lost, the C-AP can notify the terminal to stop function X.

[0192] Further, according to an embodiment of the present invention, there is provided a communication method in which a communication device executes a transmission procedure for transmitting a connection request to a first communication device, a reception procedure for receiving a connection permission from the first communication device, a control procedure for establishing a first connection with the first communication device, and a control procedure for controlling the communication of a second communication device.

[0193] With the above configuration, a connection can be established between the C-AP and the device that controls the C-AP, and the communication of the UE in the target PLMN can be executed via the C-AP. That is, in a wireless communication system, the redundancy of the network can be ensured.

[0194] (Supplement of the embodiment) The embodiments of the present invention have been described above. However, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, corrections, alternatives, substitutions, etc. Although specific numerical examples have been used for the purpose of facilitating the understanding of the invention, unless otherwise specified, those numerical values are merely examples, and any appropriate values may be used. The classification of the items in the above description is not essential to the present invention, and the matters described in two or more items may be used in combination as needed, or the matters described in one item may be applied to the matters described in another item (as long as there is no contradiction). The boundaries of the functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operation of one functional unit may be physically performed by a plurality of components. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as there is no contradiction. For the sake of convenience in explaining the processing, the base station 10 and the terminal 20 have been described using a functional block diagram, but such devices may be realized by hardware, software, or a combination thereof. The software that operates by the processor included in the base station 10 according to the embodiment of the present invention and the software that operates by the processor included in the terminal 20 according to the embodiment of the present invention may be stored in a random access memory (RAM), a flash memory, a read-only memory (ROM), an EPROM, an EEPROM, a register, a hard disk drive (HDD), a removable disk, a CD-ROM, a database, a server, or any other appropriate storage medium, respectively.

[0195] Also, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, notification information (MIB (Master Information Block), SIB (System Information Block)), other signals or combinations thereof. Also, the RRC signaling may be referred to as an RRC message, and for example, it may be an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, etc.

[0196] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems using LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based thereon. Also, a plurality of systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) and applied.

[0197] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this specification may be rearranged as long as there is no contradiction. For example, regarding the methods described in this disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0198] The specific operations assumed to be performed by the base station 10 in this specification may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station 10 is exemplified above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0199] The information or signals, etc. described in this disclosure can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0200] The input and output information, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information, etc. can be overwritten, updated, or appended. The output information, etc. may be deleted. The input information, etc. may be transmitted to other devices.

[0201] The determination in this disclosure may be made by a value represented by 1 bit (0 or 1), or by a Boolean value (true or false), or by a numerical comparison (for example, comparison with a predetermined value).

[0202] Software should be broadly construed to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, hardware description language, or by any other name.

[0203] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL)) and wireless technologies (such as infrared, microwave), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0204] 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., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0205] Note that terms described in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0206] The terms "system" and "network" used in this disclosure are used interchangeably.

[0207] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, relative values from a predetermined value, or another corresponding piece of information. For example, radio resources may be indicated by an index.

[0208] The names used for the above-described parameters are not limiting names in any respect. Furthermore, mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0209] In the present disclosure, terms such as "base station (BS: Base Station)", "radio base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0210] A base station can accommodate one or more (e.g., three) cells. When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base station and the base station subsystem that provides communication services in this coverage.

[0211] In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" can be used interchangeably.

[0212] A mobile station may also be referred to by those skilled in the art as 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 terms.

[0213] At least one of the base station and the mobile station may also be called a transmission device, a reception device, a communication device, etc. Note that at least one of the base station and the mobile station may also be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), a moving body that moves without a driver (e.g., a drone, an autonomous vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes devices that do not necessarily move during communication operations. 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.

[0214] In addition, the base station in the present disclosure may be replaced by a user terminal. For example, for a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals 20 (which may be referred to as, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the above-described base station 10 may be configured to be functions of the terminal 20. Also, terms such as "uplink" and "downlink" may be replaced with terms corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, downlink channel, etc. may be replaced with side channels.

[0215] Similarly, the user terminal in the present disclosure may be replaced by a base station. In this case, the functions of the above-described user terminal may be configured to be functions of the base station.

[0216] As used herein, the terms "determining" and "deciding" may encompass a variety of operations. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching a table, database, or other data structure), ascertaining, and considering something as having been "determined" or "decided". "Determining" and "deciding" may also include receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in memory), and considering something as having been "determined" or "decided". "Determining" and "deciding" may further include resolving, selecting, choosing, establishing, comparing, and considering something as having been "determined" or "decided". That is, "determining" and "deciding" may include considering something as having been "determined" or "decided" through some operation. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", etc.

[0217] The terms "connected" or "coupled," or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed." As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electrical wires, cables, and printed electrical connections, and also using, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in the radio frequency region, microwave region, and optical (both visible and invisible) region.

[0218] The reference signal can also be abbreviated as RS (Reference Signal) and may be called a Pilot depending on the applicable standard.

[0219] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on."

[0220] Any reference to an element using designations such as "first," "second," etc. used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements can be employed, or that the first element must precede the second element in any form.

[0221] In the configuration of each of the above devices, "means" can be replaced with "section," "circuit," "device," etc.

[0222] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, similar to the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0223] The wireless frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0224] Numerology may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate at least one of, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0225] The slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. The slot may be a time unit based on numerology.

[0226] The slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0227] The radio frame, sub-frame, slot, mini-slot, and symbol all represent time units when transmitting signals. Different names corresponding to each of them may also be used.

[0228] For example, 1 sub-frame may be called a Transmission Time Interval (TTI), or a plurality of consecutive sub-frames may be called TTI, or 1 slot or 1 mini-slot may be called TTI. That is, at least one of the sub-frame and TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing TTI may be called a slot, mini-slot, etc. instead of a sub-frame.

[0229] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (such as the frequency bandwidth and transmission power that can be used in each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0230] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), a code block, a codeword, etc., or may be a processing unit such as scheduling and link adaptation. When the TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a codeword, etc. are actually mapped may be shorter than the TTI.

[0231] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit of scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

[0232] 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, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

[0233] Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or a short TTI (e.g., a shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0234] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, for example, it may be 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0235] Also, the time domain of the RB may include one or more symbols, and may have a length of one slot, one mini-slot, one sub-frame, or one TTI. One TTI, one sub-frame, etc. may each be composed of one or more resource blocks.

[0236] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0237] Also, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource area of one sub-carrier and one symbol.

[0238] A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. A PRB is defined in a certain BWP and may be numbered within that BWP.

[0239] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). For the terminal 20, one or more BWPs may be set within one carrier.

[0240] At least one of the set BWPs may be active, and the terminal 20 may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0241] The structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, etc. can be variously changed.

[0242] In the present disclosure, for example, when articles are added by translation like a, an, and the in English, the present disclosure may include that the nouns following these articles are in the plural form.

[0243] In the present disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are different from C respectively". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0244] In the present disclosure, each aspect / embodiment described may be used alone, in combination, or switched and used during execution. Also, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, without performing the notification of the predetermined information).

[0245] Note that in the present disclosure, device 10B is an example of a first communication device. Terminal 20 is an example of a second communication device.

[0246] As described above in detail, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes and has no restrictive meaning for the present disclosure.

Explanation of Signs

[0247] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 240 Control unit 30 Core network 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A transmitting unit that transmits a connection request to a base station, A receiving unit that receives a connection permission from the base station, And a control unit that establishes a first connection with the base station, The control unit controls wireless communication with the terminal and establishes an RRC (Radio Resource Control) connection with the terminal. The control unit manages the first connection using a timer, and if signal transmission and reception with the base station are not completed until the timer expires, determines that the first connection has been disconnected. The control unit disconnects the RRC connection when the first connection is disconnected after the RRC connection is established. A communication device.

2. The communication device according to claim 1, wherein the control unit establishes a second connection with the Internet and establishes a user plane connection of the terminal through the second connection.

3. The connection request includes location information of the own device or the terminal. The communication device according to claim 1 or claim 2.

4. When the first connection is disconnected, the transmitting unit notifies the terminal to stop the function of performing wireless communication with the terminal. The communication device according to claim 1.

5. A transmission procedure for transmitting a connection request to a base station, A reception procedure for receiving a connection permission from the base station, A control procedure for establishing a first connection with the base station, A control procedure for controlling wireless communication with the terminal and establishing an RRC (Radio Resource Control) connection with the terminal, A control procedure for managing the first connection using a timer and determining that the first connection has been disconnected if signal transmission and reception with the base station are not completed until the timer expires. A communication method in which a communication device executes a control procedure for disconnecting the RRC connection when the first connection is disconnected after the RRC connection is established.

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