Terminal device, base station device and method

Abstract

[Problem] Provide a mechanism that enables multiple communication devices to use radio resources more efficiently. [Solution] A terminal device includes: a control unit configured to send first resource information on an uplink or a sidelink, the first resource information indicating a radio resource available to another communication device among radio resources to which access rights are acquired by performing carrier sensing.

Description

Technical Field

[0001] The present disclosure relates to a terminal device, a base station device and a method. Background Art

[0002] Radio access schemes and wireless networks for cellular mobile communications (hereinafter also referred to as Long Term Evolution (LTE), Advanced LTE (LTE-A), LTE-advanced pro (LTE-A Pro), New Radio (NR), New Radio Access Technology (NRAT), 5G, Evolved Universal Terrestrial Radio Access (EUTRA) or Further EUTRA (FEUTRA)) are being studied in the Third Generation Partnership Project (3GPP). Incidentally, in the following description, LTE includes LTE-A, LTE-A Pro and EUTRA, and NR includes NRAT and FEUTRA. In LTE, a base station device (base station) is also referred to as an evolved Node B (eNodeB), and in NR, a base station device (base station) is also referred to as a gNodeB (gNB). In LTE and NR, a terminal device (mobile station, mobile station device and terminal) is also referred to as a user equipment (UE). LTE and NR are cellular communication methods in which multiple areas covered by a base station device are arranged in a cell shape. A single base station device can manage multiple cells.

[0003] NR is the wireless access solution for the next generation of LTE and is a different radio access technology (RAT) from LTE. NR is an access technology that can support a variety of use cases, including enhanced mobile broadband (eMBB), massive machine type communications (mMTC), and ultra-reliable low latency communications (URLLC). NR is studied for the following technical framework, which addresses the usage scenarios, requirements, and deployment scenarios in those use cases.

[0004] In unlicensed bands and licensed shared bands, the operation of wireless access schemes based on cellular communications is being studied. In such unlicensed bands, coexistence with other nodes and wireless systems is considered important, and in wireless access schemes such as LTE and NR, functions such as listen before talk (LBT) for channel sensing before transmission and intermittent transmission are required. Details of NR-based wireless access schemes in unlicensed bands are disclosed in non-patent document 1. By the way, unlicensed bands are, for example, 2.4 GHz bands, 5 GHz bands, and 6 GHz bands. Licensed shared bands are, for example, 3.5 GHz bands or 37 GHz bands.

[0005] Reference List

[0006] Non-patent literature

[0007] Non-patent document 1: RP-172021, "Study on NR-based Access to Unlicensed Spectrum", 3GPP TSG RAN 77th Meeting, Sapporo, Japan, September 11-14, 2017. Summary of the invention

[0008] Technical issues

[0009] However, in an environment where there are multiple communication devices and each communication device independently performs LBT, the efficiency of using radio resources (frequency resources and time resources) may be reduced. This is because every time each communication device uses radio resources, a waiting time due to sensing for obtaining access rights occurs.

[0010] In this regard, the present disclosure provides a mechanism that enables multiple communication devices to use radio resources more efficiently.

[0011] Solution to the problem

[0012] According to the present disclosure, a terminal device is provided, including: a control unit configured to send first resource information on an uplink or a sidelink, the first resource information indicating radio resources available to another communication device among radio resources whose access rights are obtained by performing carrier sensing.

[0013] In addition, according to the present disclosure, a base station device is provided, including: a control unit, configured to receive resource information from a terminal device, the resource information indicating resources available to another communication device other than the terminal device among radio resources to which the terminal device obtains access rights by performing carrier sensing, and the control unit is configured to use the resources available to the other communication device for communication.

[0014] In addition, according to the present disclosure, a method executed by a processor is provided, the method comprising: sending first resource information on an uplink or a sidelink, the first resource information indicating radio resources available to another communication device among radio resources to which access rights are obtained by performing carrier sensing.

[0015] Advantageous Effects of the Invention

[0016] As described above, according to the present disclosure, a mechanism is provided that enables multiple communication devices to use radio resources more efficiently. By the way, the above effects are not necessarily limited, and any effect described in this specification or other effects that can be understood from this specification can be exerted together with or instead of the above effects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a diagram illustrating an example of the overall configuration of a system according to an embodiment of the present disclosure.

[0018] Figure 2 is a diagram for describing an example of communication in LAA.

[0019] Figure 3 : is a diagram showing an example of a frame configuration of self-contained transmission in the present embodiment.

[0020] Figure 4 is a block diagram showing a configuration example of a base station device according to the present embodiment.

[0021] Figure 5 is a block diagram showing a configuration example of a terminal device according to the present embodiment.

[0022] Figure 6 : is a diagram for describing an example of sharing access rights according to the present embodiment.

[0023] Figure 7 is a diagram for describing another example of shared access rights according to the present embodiment.

[0024] Figure 8 is a diagram for describing still another example of sharing the access authority according to the present embodiment.

[0025] Fig. 9 is a diagram for describing still another example of sharing the access authority according to the present embodiment.

[0026] Fig.10 2 is a diagram for describing sharing of access rights by a second terminal device according to the present embodiment.

[0027] Fig.11 : is a flowchart showing an example of the flow of access right sharing processing performed by the first terminal device according to the present embodiment.

[0028] Fig.12 : is a flowchart showing an example of the flow of access right sharing processing performed by the base station device according to the present embodiment.

[0029] Fig.13 : is a flowchart showing an example of the flow of access right sharing processing performed by the second terminal device according to the present embodiment.

[0030] Fig.14 : is a flowchart showing an example of the flow of access right sharing processing performed by the second terminal device according to the present embodiment.

[0031] Fig.15 is a block diagram showing a first example of a schematic configuration of an eNB.

[0032] Fig.16 is a block diagram showing a second example of a schematic configuration of an eNB.

[0033] Fig.17 is a block diagram showing an example of a schematic configuration of a smartphone.

[0034] Fig.18 is a block diagram showing an example of a schematic configuration of a car navigation device. DETAILED DESCRIPTION

[0035] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, in this specification and the accompanying drawings, components having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

[0036] The description will be made in the following order.

[0037] 1. Introduction

[0038] 1.1. System Configuration Example

[0039] 1.2. Technical issues

[0040] 1.3. Overview of the Proposed Method

[0041] 1.4. Related technologies

[0042] 2. Configuration Example

[0043] 2.1. Configuration example of base station equipment

[0044] 2.2. Configuration example of terminal device

[0045] 3. Technical features

[0046] 3.1. Sharing of sharable resource information

[0047] 3.2. Shared access rights

[0048] 3.3. Content of Shareable Resource Information

[0049] 3.4. Method of sending sharable resource information

[0050] 3.5. Sharing of the Second Terminal Device

[0051] 3.6. Processing flow

[0052] 4. Application Examples

[0053] 5. Conclusion

[0054] <1. Introduction>

[0055] <1.1. System Configuration Example>

[0056] Figure 1 1 is a diagram showing an example of the overall configuration of the system 1 according to an embodiment of the present disclosure. Figure 1 As shown, the system 1 includes base station devices 100 ( 100A and 100B), terminal devices 200 ( 200A and 200B), a core network 20 , and a packet data network (PDN) 30 .

[0057] The base station device 100 operates a cell 11 (11A or 11B) and provides a wireless service to one or more terminal devices located inside the cell 11. For example, the base station device 100A provides a wireless service to the terminal device 200A, and the base station device 100B provides a wireless service to the terminal device 200B. The cell 11 can be operated according to any wireless communication method such as LTE or New Radio (NR). The base station device 100 is connected to the core network 20. The core network 20 is connected to the PDN 30.

[0058] The core network 20 may include a mobility management entity (MME), a serving gateway (S-GW), a PDN gateway (P-GW), a policy and charging rules function (PCRF), and a home subscriber server (HSS). Alternatively, the core network 20 may include an entity of a NR having functions similar to those described above. The MME is a control node that processes signals of a control plane and manages the mobility status of a terminal device. The S-GW is a control node that processes signals of a user plane and is a gateway device that switches a delivery path for user data. The P-GW is a control node that processes signals of a user plane and is a gateway device that serves as a connection point between the core network 20 and the PDN 30. The PCRF is a control node that controls policies such as quality of service (QoS) for bearer and charging. The HSS is a control node that processes user data and performs service control.

[0059] Based on the control of the base station device 100, the terminal device 200 performs wireless communication with the base station device 100. The terminal device 200 may be a so-called user equipment (UE). For example, the terminal device 200 sends an uplink signal to the base station device 100 and receives a downlink signal from the base station device 100. The terminal device 200 may also perform device-to-device (D2D) communication. That is, the terminal device 200 may send a sidelink signal of another terminal device 200 and may receive a sidelink signal from another terminal device 200.

[0060] <1.2. Technical issues>

[0061] · Base station equipment obtains access rights

[0062] Conventionally, in License Assisted Access (LAA), a base station device acquires access rights to radio resources (hereinafter also referred to as channels). The acquired access rights are then shared by the base station device and the terminal device communicating with the base station device. This will be referred to in Figure 2 Give a description.

[0063] Figure 2 is a diagram for describing an example of communication in LAA. Figure 2 The upper part of shows carrier sensing performed by the base station device and a signal transmitted by the base station device. Figure 2 The lower part of shows the carrier sensing performed by the terminal device and the signal sent by the terminal device. The rectangle described as DL is the time resource used to send the downlink signal. The time resource is, for example, a time slot or a subframe. The rectangle described as UL is the time resource used to send the downlink signal. Figure 2 As shown, the base station device first uses random backoff to perform carrier sensing and obtain access rights. Next, based on the obtained access rights, the base station device sends a downlink signal during a period when the channel may be occupied (channel occupation time: COT). COT is a period during which the access rights obtained are valid. On the other hand, the base station device instructs the terminal device to perform uplink transmission during the COT by using an uplink grant. Then, after performing carrier sensing without using random backoff, the terminal device sends an uplink signal according to the uplink grant.

[0064] The channel access method varies depending on whether it is within the COT. Specifically, outside the COT, the communication device performs carrier sensing by using random backoff and accesses the channel (e.g., LBT category 4). On the other hand, the communication device performs carrier sensing without using random backoff within the COT (i.e., during the period in which the communication device has access rights) and accesses the channel (e.g., LBT category 2). Figure 2 In the example shown, the base station device initially does not obtain access rights (i.e., outside the COT), and therefore accesses the channel by using random backoff. On the other hand, based on the uplink grant, the terminal device shares the access rights obtained by the base station device, and accesses the channel without using random backoff during the period in which the access rights obtained by the base station device are valid (i.e., within the COT). As described above, in uplink transmission in LAA, by sharing access rights, the terminal device does not have to use random backoff starting from 1 to perform channel access.

[0065] Various studies

[0066] On the other hand, in LTE and NR, uplink grant-free transmission (also called grant-free transmission) is being studied. Grant-free transmission is a method in which a terminal device transmits an uplink signal in a periodic resource semi-statically indicated by radio resource control (RRC) signaling without receiving an uplink grant from a base station device.

[0067] In NR, autonomous uplink channel access in which a terminal device acquires access rights is being studied. Autonomous uplink channel access is a method in which, when performing uplink unlicensed transmission, the terminal device itself performs LBT using a channel access procedure using random backoff to acquire access rights.

[0068] D2D communication using unlicensed bands is being studied. The advantage is that by using unlicensed bands for D2D communication, D2D communication between different operators becomes easier to use.

[0069] Technical issues

[0070] Simply acquiring access rights independently by each terminal device may reduce the efficiency of radio resource usage. This is because even if a terminal device acquires access rights, there is no mechanism for sharing the acquired access rights with another communication device. Therefore, after acquiring access rights, the terminal device releases the channel once for another communication device to communicate. Then, the other communication device performs channel access using a random backoff starting from 1, so a waiting time occurs.

[0071] <1.3. Overview of the proposed method>

[0072] Therefore, in one embodiment of the present disclosure, in view of the above technical problems, a mechanism is proposed in which access rights acquired by a terminal device 200 can be shared by another communication device (eg, a base station device 100 or another terminal device 200).

[0073] In this embodiment, first, the terminal device 200 acquires access rights by performing channel access using random backoff. Thereafter, the terminal device 200 transmits information on an uplink or a sidelink indicating radio resources available to another communication device in the radio resources that has acquired its access rights. Therefore, another communication device that receives such information can perform communication by sharing the access rights acquired by the terminal device 200 without acquiring access rights itself. Specifically, in the radio resources related to the access rights acquired by the terminal device 200, another communication device performs communication by performing channel access without using random backoff. Another communication device can perform communication without acquiring access rights, so the processing load is reduced. In addition, since carrier sensing using random backoff is not performed, the waiting time is reduced, so the efficiency of use of radio resources can be improved.

[0074] <1.4. Related technologies>

[0075] Hereinafter, techniques related to the proposed technology will be described.

[0076] <NR frame configuration in this embodiment>

[0077] In NR, physical channels and / or physical signals may be transmitted via self-contained transmission. Figure 3 An example (A to C) of the frame configuration of the self-contained transmission in the present embodiment is shown. In the self-contained transmission, the transmission and reception are configured once in the order of continuous downlink transmission, GP and continuous downlink transmission from the beginning. The continuous downlink transmission includes at least one downlink control information and DMRS. The downlink control information gives an indication of the reception of the downlink physical channel included in the continuous downlink transmission or the transmission of the uplink physical channel included in the continuous uplink transmission. In the case where the downlink control information gives an indication of the reception of the downlink physical channel, the terminal device 200 attempts to receive the downlink physical channel based on the downlink control information. Then, the terminal device 200 sends the reception success / failure (decoding success / failure) of the downlink physical channel by using the uplink control channel included in the uplink transmission allocated after the GP. On the other hand, in the case where the downlink control information gives an indication of the transmission of the uplink physical channel, the transmitted uplink physical channel is included in the uplink transmission and is transmitted based on the downlink control information. In this way, by flexibly switching between the transmission of uplink data and the transmission of downlink data according to the downlink control information, it is possible to immediately cope with an increase or decrease in the traffic ratio between the uplink and the downlink. In addition, by providing a notification of the success / failure of receiving the downlink by the immediately following uplink transmission, low-latency communication of the downlink can be achieved.

[0078] The unit time slot is the minimum time unit for defining downlink transmission, GP or uplink transmission. The unit time slot is reserved for any one of downlink transmission, GP or uplink transmission. The unit time slot does not include both downlink transmission and uplink transmission. The unit time slot may be the minimum transmission time of a channel associated with a DMRS included in the unit time slot. One unit time slot is defined, for example, as a sampling interval (T s ) and an integer multiple of the symbol length.

[0079] The unit frame time may be the minimum time specified in the schedule. The unit frame time may be the minimum unit for sending a transport block. The unit slot time may be the maximum transmission time of a channel associated with a DMRS included in the unit slot time. The unit frame time may be a unit time for determining uplink transmission power in the terminal device 200. The unit frame time may be referred to as a subframe. There are three types of unit frame times: downlink transmission only, uplink transmission only, and a combination of uplink transmission and downlink transmission. A unit frame time is, for example, composed of a sampling interval (T s ), symbol length and unit time slot time are defined as integer multiples.

[0080] The transceiver time is the time of one transceiver. The time between one transceiver and another is occupied by the time (gap) during which no physical channel or physical signal is transmitted. The terminal device 200 does not need to average the CSI measurement between different transceivers. The transceiver time may be referred to as TTI. One transceiver time is, for example, determined by the sampling interval (TTI) of the NR. s ), symbol length, unit time slot time and unit frame time are defined as integer multiples.

[0081] <Channel Access Procedure for License-Unlimited Channels>

[0082] A channel access (channel access and listen-before-talk) procedure is performed to access an unlicensed channel for transmission by a base station device or a terminal device.

[0083] During the channel access process, one or more channel sensing is performed. Based on the sensing results, it is determined (empty determination) whether the channel is idle (idle, unoccupied, available, enabled) or busy (busy, occupied, unavailable, disabled). In channel sensing, the power of the channel during a predetermined waiting time is sensed.

[0084] Examples of the waiting time of the channel access procedure include a first waiting time (time slot), a second waiting time, a third waiting time (delay period), and a fourth waiting time.

[0085] A time slot is a unit of waiting time for a base station device and a terminal device during a channel access process. A time slot is defined by, for example, nine microseconds.

[0086] During the second waiting time, a time slot is inserted in the head. The second waiting time is defined as 16 microseconds, for example.

[0087] The delay period is composed of a second waiting time and a plurality of consecutive time slots after the second waiting time. The number of consecutive time slots after the second waiting time is determined based on a priority level (channel access priority level) for satisfying QoS.

[0088] The fourth waiting time is composed of the second waiting time and a time slot after the second waiting time.

[0089] The base station device or the terminal device senses the predetermined channel during the predetermined time slot period. In the case where the power detected by the base station device or the terminal device for at least four microseconds within the predetermined time slot period is less than a predetermined power detection threshold, the predetermined time slot is considered to be idle. On the other hand, in the case where the power is greater than the predetermined power detection threshold, the predetermined time slot is considered to be busy.

[0090] The channel access process includes a first channel access process and a second channel access process. The first channel access process is performed using a plurality of time slots and delay periods. The second channel access process is performed using a fourth waiting time.

[0091] Parameters related to channel access are determined based on the priority level. Examples of parameters related to channel access include a minimum contention window, a maximum contention window, a maximum channel occupancy time, and a value that the contention window can take. The priority level is determined by the value of a QoS class identifier (QCI) that handles quality of service (QoS). Table 1 shows a table of correspondences between priority levels and parameters related to channel access, and Table 2 shows an example of a mapping between priority levels and QCIs.

[0092] Table 1. An example of a table of correspondence between priority levels and parameters related to channel access

[0093]

[0094]

[0095] Table 2. An example of mapping between priority levels and QCIs

[0096] Channel access priority level QCI 1 1，3，5，65，66，69， 2 2，7 3 4，6，8，9 4 Other than the above

[0097] <Details of First Channel Access Procedure>

[0098] In the first channel access process, the following process is performed.

[0099] (0) Channel sensing is performed during the delay period. In the case where the channel is idle in the time slot within the delay period, the process proceeds to step (1), otherwise, the process proceeds to step (6).

[0100] (1) Obtain the initial value of the counter. The possible values ​​of the initial value of the counter are integers between zero and the contention window CW. The initial value of the counter is randomly determined according to a uniform distribution. The initial value of the counter is set in the counter N, and the process proceeds to step (2).

[0101] (2) When the counter N is greater than zero and the counter N is selected for subtraction, 1 is subtracted from the counter N. Thereafter, the process proceeds to step (3).

[0102] (3) Add a time slot period to the waiting. In addition, in the additional time slot, the channel is sensed. If the additional time slot is idle, the process proceeds to step (4), otherwise, the process proceeds to step (5).

[0103] (4) If the counter N is zero, the process stops. Otherwise, the process goes to step (2).

[0104] (5) Add the delay period to the waiting. In addition, the channel is sensed until any one of the time slots included in the additional delay period is detected to be busy, or until all the time slots included in the additional delay period can be detected to be idle. Thereafter, the process enters step (6).

[0105] (6) In the case where the channel is sensed as idle in all time slots included in the additional delay period, the process proceeds to step (4); otherwise, the process proceeds to step (5).

[0106] After stopping of step (4) in the above process, transmission including data such as PDSCH and PUSCH is performed on the channel.

[0107] Incidentally, after the stop of step (4) in the above process, transmission may not be performed on the channel. In this case, thereafter, in the case where the channel is idle in all time slots and delay periods immediately before transmission, transmission may be performed without performing the above process. On the other hand, in the case where the channel is not idle in any time slot and delay period, the channel is sensed as idle in all time slots in the additional delay period, and then the process proceeds to step (1) in the above process.

[0108] <Details of Second Channel Access Procedure>

[0109] In the second channel access process, transmission may occur immediately after the channel is considered idle due to sensing at least the fourth waiting time. On the other hand, in the case where the channel is not considered idle due to sensing at least the fourth waiting time, transmission is not performed.

[0110] <Contest Window Adaptation Process>

[0111] A contention window (CW) used in the first channel access process is determined based on a contention window adaptation process.

[0112] For each priority level, the value of the contention window CW is maintained. The contention window CW takes a value between the minimum contention window and the maximum contention window. The minimum contention window and the maximum contention window are determined based on the priority level.

[0113] The adjustment of the contention window CW value is performed before step (1) of the first channel access process. In the case where the proportion of NACKs in the HARQ responses corresponding to at least the reference subframe or the shared channel of the reference HARQ process is greater than a threshold value during the contention window adaptation process, the contention window CW value is increased, otherwise, the contention window CW value is set to the minimum contention window.

[0114] The value of the contention window CW is increased based on, for example, the equation CW=2x(CW+1)-1.

[0115] <Details of Channel Access Procedure in Downlink>

[0116] In case of performing downlink transmission including PDSCH, PDCCH and / or EPDCCH on an unlicensed channel, the base station apparatus accesses the channel based on a first channel access procedure and performs downlink transmission.

[0117] On the other hand, in the case of performing downlink transmission including DRS but not PDSCH in the unlicensed channel, the base station device accesses the channel based on the second channel access procedure and performs downlink transmission. Note that the period of downlink transmission is preferably less than one millisecond.

[0118] <Details of Channel Access Procedure in Uplink>

[0119] In case an indication is given in the unlicensed channel to perform the first channel access procedure in the uplink grant for scheduling the PUSCH, the terminal device performs the first channel access procedure before the uplink transmission including the PUSCH.

[0120] In a case where an indication to perform the second channel access procedure is given in the uplink grant for scheduling the PUSCH, the terminal device performs the second channel access procedure before uplink transmission including the PUSCH.

[0121] For uplink transmissions that do not include PUSCH but include SRS, the terminal device performs a second channel access procedure prior to the uplink transmission.

[0122] In case the end of the uplink transmission indicated by the uplink grant is within the uplink period (UL duration), the terminal device sends a second channel access procedure before the uplink transmission, regardless of the procedure type indicated by the uplink grant.

[0123] In a case where uplink transmission continues with the fourth waiting time inserted after the end of downlink transmission from the base station, the terminal device performs the second channel access procedure before the uplink transmission.

[0124] <NR channel access process in this embodiment>

[0125] In the channel access procedure in the unlicensed channel using NR, non-beamformed channel sensing and beamformed channel sensing are performed.

[0126] Non-beamforming channel sensing is channel sensing performed by reception without controlled directivity, or channel sensing without directional information. Channel sensing without directional information is, for example, channel sensing that averages measurement results in all directions. The transmitting station does not need to identify the directivity (angle and direction) used in channel sensing.

[0127] Beamforming channel sensing is channel sensing performed by reception with controlled directivity, or channel sensing with directional information. That is, beamforming channel sensing is channel sensing in which a receiving beam is directed in a predetermined direction. A transmitting station having a function of performing beamforming channel sensing may perform one or more channel sensings using different directivities.

[0128] By performing beamforming channel sensing, the area detected by the sensing is reduced. Therefore, the transmitting station can reduce the frequency of detecting a communication link that does not cause interference, and can reduce problems with the terminal.

[0129] <2. Configuration example>

[0130] <2.1. Configuration example of base station equipment>

[0131] Figure 4 is a block diagram showing a configuration example of the base station device 100 according to the present embodiment. Figure 4 , the base station device 100 includes an antenna unit 110, a wireless communication unit 120, a network communication unit 130, a storage unit 140 and a control unit 150.

[0132] (1) Antenna unit 110

[0133] The antenna unit 110 radiates the signal output by the wireless communication unit 120 into the space as radio waves. In addition, the antenna unit 110 converts the radio waves in the space into signals and outputs the signals to the wireless communication unit 120.

[0134] (2) Wireless communication unit 120

[0135] The wireless communication unit 120 transmits and receives signals. For example, the wireless communication unit 120 transmits a downlink signal to a terminal device and receives an uplink signal from a terminal device.

[0136] (3) Network communication unit 130

[0137] The network communication unit 130 sends and receives information. For example, the network communication unit 130 sends information to another node and receives information from another node. For example, the other node includes another base station and another core network node.

[0138] (4) Storage unit 140

[0139] The storage unit 140 temporarily or permanently stores programs and various data used for the operation of the base station apparatus 100 .

[0140] (5) Control unit 150

[0141] The control unit 150 controls the overall operation of the base station device 100 to provide various functions of the base station device 100. The control unit 150 includes an access right sharing unit 151 and a communication processing unit 153.

[0142] The access permission sharing unit 151 has a function of performing processing related to sharing of the access permission acquired by the terminal device 200. For example, the access permission sharing unit 151 acquires information about radio resources for which the access permission is acquired by the terminal device 200. In addition, the access permission sharing unit 151 performs processing for using the radio resources for which the access permission is acquired by the terminal device 200 by terminal devices 200 other than the terminal device 200 that acquires the access permission.

[0143] The communication processing unit 153 has a function of performing communication processing with the terminal device 200. The communication processing unit 153 performs different processing depending on whether the radio resource used for communication is a radio resource for which access rights have been acquired. Specifically, in the case of using a radio resource for which access rights have not been acquired, the communication processing unit 153 performs communication by performing channel access using random backoff. On the other hand, in the case of using a radio resource for which access rights have been acquired by the terminal device 200, the communication processing unit 153 performs communication by performing channel access without using random backoff.

[0144] The control unit 150 may further include other components in addition to these components. That is, the control unit 150 may perform operations in addition to the operations of these components.

[0145] <2.2. Configuration example of terminal equipment>

[0146] Figure 5 2 is a block diagram showing a configuration example of the terminal device 200 according to the present embodiment. Figure 5 The terminal device 200 includes an antenna unit 210, a wireless communication unit 220, a storage unit 230 and a control unit 240.

[0147] (1) Antenna unit 210

[0148] The antenna unit 210 radiates the signal output by the wireless communication unit 220 into the space as radio waves. In addition, the antenna unit 210 converts the radio waves in the space into signals and outputs the signals to the wireless communication unit 220.

[0149] (2) Wireless communication unit 220

[0150] The wireless communication unit 220 transmits and receives signals. For example, the wireless communication unit 220 receives a downlink signal from a base station and transmits an uplink signal to the base station. In addition, the wireless communication unit 220 receives a sidelink signal from another terminal device 200 and transmits a sidelink signal to another terminal device 200.

[0151] (3) Storage unit 230

[0152] The storage unit 230 temporarily or permanently stores programs and various data for operating the terminal device 200 .

[0153] (4) Control unit 240

[0154] The control unit 240 controls the overall operation of the terminal device 200 to provide various functions of the terminal device 200. The control unit 240 includes an access authority sharing unit 241 and a communication processing unit 243.

[0155] The access permission sharing unit 241 performs processing related to sharing of access permissions. The terminal device 200 can obtain access permissions by itself. In that case, the access permission sharing unit 241 sends information about the radio resources for which access permissions are obtained to another communication device (e.g., the base station device 100 or another terminal device 200). The terminal device 200 can share the access permissions obtained by another terminal device 200. In that case, the access permission sharing unit 241 obtains information about the radio resources for which access permissions are obtained by another terminal device 200.

[0156] The communication processing unit 243 has a function of performing communication processing with another communication device. The communication processing unit 243 performs different processing depending on whether the radio resource used for communication is a radio resource for which access rights have been acquired. Specifically, in the case of using a radio resource for which access rights have not been acquired, the communication processing unit 243 acquires access rights by performing channel access using random backoff, and then performs communication. On the other hand, in the case of using a radio resource for which access rights have been acquired by the terminal device 200 itself or another terminal device 200, the communication processing unit 243 performs communication by performing channel access without using random backoff.

[0157] The control unit 240 may further include other components in addition to these components. That is, the control unit 240 may perform operations in addition to the operations of these components.

[0158] <3. Technical Features>

[0159] <3.1. Sharing of sharable resource information>

[0160] The terminal device 200 (e.g., the communication processing unit 243) obtains access rights by performing carrier sensing. Specifically, the terminal device 200 performs carrier sensing using random backoff and obtains access rights to radio resources. Then, the terminal device 200 (e.g., the access rights sharing unit 241) sends resource information on an uplink or a sidelink, which indicates the radio resources available to another communication device in the radio resources for which its access rights have been obtained. Therefore, another communication device can share the access rights obtained by the terminal device 200. In the following, another communication device is also referred to as a shared communication device. The shared communication device includes a base station device 100 and another terminal device 200.

[0161] The terminal device 200 that obtains the access right is also referred to as the first terminal device 200. In addition, another terminal device 200 that is a terminal device 200 and shares the access right obtained by the first terminal device 200 is also referred to as the second terminal device 200. The terminal device 200 can be used as both the first terminal device 200 and the second terminal device 200. In the case where the terminal device 200 is used as the first terminal device 200, the resource information transmitted by the first terminal device 200 corresponds to the first resource information. In the case where the terminal device 200 is used as the second terminal device 200, the resource information transmitted from the first terminal device 200 and received by the second terminal device 200 corresponds to the second resource information.

[0162] Among the radio resources for which the first terminal device 200 has acquired access rights, the radio resources available to the shared communication device are also referred to as sharable resources below. The sharable resources may be regarded as the radio resources for which the first terminal device 200 has acquired access rights, or may be regarded as radio resources that are not used by the first terminal device 200 among the radio resources for which the first terminal device 200 has acquired access rights. Focusing on time resources, the sharable resources may be regarded as the COT, or may be regarded as a part of the COT that is not used by the first terminal device 200. In addition, the resource information indicating the sharable resources is also referred to as sharable resource information below.

[0163] <3.2. Sharing of access rights>

[0164] Upon receiving the sharable resource information, the shared communication device transmits a signal by using the sharable resource based on the received sharable resource information. Here, the sharable resource information is information indicating resources available to another communication device other than the first terminal device 200 in the radio resources to which the first terminal device 200 acquires its access right by performing carrier sensing.

[0165] (1) Sharing of base station equipment 100

[0166] A case where the shared communication device is the base station device 100 will be described.

[0167] The base station device 100 (e.g., the communication processing unit 153) can use the sharable resources for communication based on the sharable resource information. In this case, the base station device 100 uses the sharable resources to send signals. That is, the base station device 100 uses the radio resources that are not used by the first terminal device 200 among the radio resources whose access rights are obtained by the first terminal device 200 to send signals. At that time, the base station device 100 performs channel access without using random backoff to perform carrier sensing. For example, the base station device 100 can perform carrier sensing without using random backoff, and perform channel access. In addition, the base station device 100 can perform channel access without first performing carrier sensing. By the way, the signal transmission destination can be the first terminal device 200 or another terminal device 200 connected to the base station device 100.

[0168] In addition, the base station device 100 can make the second terminal device 200 use the sharable resource. In that case, based on the sharable resource information, the base station device 100 (e.g., the access right sharing unit 151) sends an authorization message (e.g., uplink authorization) to the terminal device 200 (corresponding to the second terminal device 200) other than the first terminal device 200, and the authorization message gives an instruction about sending a signal in the sharable resource. Then, the second terminal device 200 sends a signal (e.g., uplink signal) by using the sharable resource based on the received authorization message. More specifically, the second terminal device 200 sends a signal by using the radio resources that are not used by the first terminal device 200 and the base station device 100 in the radio resources whose access rights are obtained by the first terminal device 200. At this time, the second terminal device 200 performs channel access without using random backoff to perform carrier sensing. For example, the second terminal device 200 can perform carrier sensing without using random backoff, and perform channel access. In addition, the second terminal device 200 can perform channel access without first performing carrier sensing.

[0169] In any case, the base station device 100 and the second terminal device 200 do not use random backoff to perform carrier sensing, thereby reducing the waiting time for channel access. That is, the use efficiency of radio resources can be improved.

[0170] (2) Sharing of the second terminal device 200

[0171] A case where the shared communication device is the second terminal device 200 will be described.

[0172] The second terminal device 200 (e.g., the communication processing unit 243) sends a signal by using the sharable resource based on the sharable resource information. That is, the second terminal device 200 uses the radio resources that are not used by the first terminal device 200 among the radio resources whose access rights are acquired by the first terminal device 200 to send a signal. At this time, the second terminal device 200 performs channel access without performing carrier sensing using random backoff. For example, the second terminal device 200 can perform carrier sensing without using random backoff, and perform channel access. In addition, the second terminal device 200 can perform channel access without first performing carrier sensing.

[0173] In any case, the second terminal device 200 does not use random backoff to perform carrier sensing, thereby reducing the waiting time for channel access. That is, the use efficiency of radio resources can be improved.

[0174] (3) Restrictions on the period of sharing

[0175] When sharing access rights, predetermined restrictions may be imposed on the shared communication device. Specifically, the types of signals that can be sent using the sharable resources may be restricted.

[0176] For example, the signal that the shared communication device can send by using the sharable resource is limited to a signal including data having a higher channel access priority level (i.e., a higher priority) than the data sent by the first terminal device 200. In addition, the signal that the shared communication device can send by using the sharable resource can be limited to a control signal / control channel. In addition, the signal that the shared communication device can send by using the sharable resource can be limited to a signal including a communication parameter used in the sharable resource to be described later.

[0177] <3.3. Contents of Shared Resource Information>

[0178] The sharable resource information may include various information. The sharable resource information includes information indicating the radio resource for which the access right is acquired. In addition, the sharable resource information may include information indicating the radio resource to be used.

[0179] (1) Information indicating the radio resource for which access rights have been acquired

[0180] For example, the sharable resource information may include information indicating the radio resource for which the access right is acquired by the first terminal device 200. In this case, the sharable resource information includes information indicating the frequency of the radio resource for which the access right is acquired by the first terminal device 200, and information indicating the time. Therefore, the shared communication device can identify the radio resource for which the access right is acquired by the first terminal device 200.

[0181] Focus is placed on the time information in the information indicating the radio resource for which the access right is acquired by the first terminal device 200. The information indicating the time when the radio resource for which the access right is acquired by the first terminal device 200 is information indicating the time (i.e., COT) during which the channel can be occupied. The information indicating the COT includes information indicating the start time, end time, and / or length of the COT. Hereinafter, an example will be described.

[0182] For example, the sharable resource information may include information indicating an interval from a time resource for sending the sharable resource information to a last time resource of a radio resource in which the first terminal device 200 obtains access rights. In other words, the sharable resource information includes information indicating the remaining time of the COT based on the time resource for sending the sharable resource information. Here, the time resource is, for example, a symbol, a time slot and / or a subframe, and the information indicating the interval is, for example, the number of symbols, the number of time slots and / or the number of subframes. The shared communication device adds the symbol number, the number of time slots and / or the subframe number to the symbol number, the time slot number and / or the subframe number of the received resource information in order to identify the last symbol, time slot and / or subframe of the radio resource in which the first terminal device 200 obtains access rights.

[0183] For example, the sharable resource information may include information indicating the last time resource in the radio resources to which access rights have been acquired by the first terminal device 200. Here, the time resource is, for example, a symbol, a time slot and / or a subframe, and the information indicating the time resource is, for example, a symbol number, a time slot number and / or a subframe number.

[0184] For example, the sharable resource information may include information indicating a first time resource in the radio resources to which access rights have been acquired by the first terminal device 200. Here, the time resource is, for example, a symbol, a time slot and / or a subframe, and the information indicating the time resource is, for example, a symbol number, a time slot number and / or a subframe number.

[0185] For example, the sharable resource information may include information indicating the length of time (i.e., the length of COT) of the radio resource for which the access right is obtained by the first terminal device 200. However, if the shared communication device already knows the information, it is not necessary to send the information in the sharable resource information. For example, in the case where the length of COT is determined by the channel access priority level, the sharable resource information may include information indicating the channel access priority level.

[0186] Examples of the information indicating the COT have been described above.

[0187] (2) Information indicating the radio resources to be used

[0188] For example, the sharable resource information may include information indicating the radio resources to be used by the first terminal device 200 among the radio resources for which the access right has been acquired by the first terminal device 200 (hereinafter, also referred to as the radio resources to be used). In this case, the sharable resource information includes information indicating the frequency of the radio resources to be used by the first terminal device 200 among the radio resources for which the access right has been acquired by the first terminal device 200, and information indicating the time. With reference to this information, the shared communication device can identify the radio resources that will not be used by the first terminal device 200. Therefore, the shared communication device can effectively access the sharable resources, for example, by accessing the radio resources that will not be used by the first terminal device 200.

[0189] Pay attention to the time information in the information indicating the radio resources to be used. The information indicating the time of the radio resources to be used includes information indicating the start time, end time and / or length of the time resources to be used (ie, the time resources to be used by the first terminal device 200 in the COT).

[0190] Note that even if the information indicating the radio resources to be used is not provided, the shared communication device can use the sharable resources. In the case where the information indicating the radio resources to be used is not provided, based on the information indicating the COT, the shared communication device performs carrier sensing without using random backoff within the COT, regardless of whether the first terminal device 200 uses the radio resources or does not use the radio resources. Then, when the use of the channel by the first terminal device 200 ends, the shared communication device detects an empty channel and starts using the sharable resources.

[0191] The radio resources to be used may be specified by the base station device 100 using RRC signaling etc. In that case, the base station device 100 can grasp the radio resources to be used in advance without providing information indicating the radio resources to be used.

[0192] <3.4. Method of sending sharable resource information>

[0193] (1) Time resources used to send sharable resource information

[0194] The first terminal device 200 (eg, the access authority sharing unit 241 ) may transmit the sharable resource information in a portion of the continuously used time resources.

[0195] For example, the first terminal device 200 may send the sharable resource information in the first time resource in the continuously used time resources. In this case, it is expected that the sharable resource information includes at least information indicating the end time of the COT and information indicating the end time of the radio resources to be used. Therefore, the shared communication device can identify the radio resources from the end time of the radio resources to be used to the end time of the COT as sharable resources.

[0196] For example, the first terminal device 200 may send the sharable resource information in a later time resource of the continuously used time resource. In this case, it is expected that the sharable resource information includes at least information indicating the end time of the COT. Therefore, the shared communication device can share the access rights obtained by the first terminal device 200 until the end time of the COT.

[0197] In either case, the shared communications devices can identify sharable resources with minimal overhead.

[0198] The first terminal device 200 (e.g., the access permission sharing unit 241) can send the sharable resource information in all time resources in the continuously used time resources. In this case, even if the reception of the sharable resource information fails in some time resources, the shared communication device receives the sharable resource information in another time resource and can share the access permission obtained by the first terminal device 200.

[0199] In the following, reference will be made to Figure 6 and Figure 7 To describe the use of the sharable resource by the shared communication device when the sharable resource information is sent in all time resources in the continuously used time resources.

[0200] Figure 6 is a diagram for describing an example of shared access rights according to the present embodiment. Figure 6 In the illustrated example, the base station device 100 corresponds to a shared communication device. Figure 6 The upper part of shows carrier sensing performed by the base station apparatus 100 and a signal transmitted by the base station apparatus 100 . Figure 6 The lower part of shows carrier sensing performed by the first terminal device 200 and signals transmitted by the first terminal device 200. A rectangle described as DL is a time resource for transmitting a downlink signal. A rectangle described as UL is a time resource for transmitting a downlink signal.

[0201] like Figure 6As shown, the first terminal device 200 first performs carrier sensing using random backoff and obtains access rights. Next, the first terminal device 200 sends an uplink signal within the COT based on the obtained access rights. At this time, the first terminal device 200 performs uplink transmission of sharable resource information in all time resources in the continuously used time resources. Figure 6 In the example shown, as the sharable resource information, information indicating the remaining time of the COT based on the time resource of transmitting the sharable resource information is transmitted. Figure 6 In the example shown, the first terminal device 200 obtains access rights to eight time resources. Then, the first terminal device 200 performs uplink transmission of sharable resource information in the first time resource, the sharable resource information indicating that access rights to the seven remaining time resources have been obtained.

[0202] Afterwards, the first terminal device 200 performs uplink transmission of sharable resource information indicating that six, five, and four access rights have been obtained for the second time resource, the third time resource, and the fourth time resource. The base station device 100 can identify the remaining time of the COT based on the sharable resource information. The first terminal device 200 finally sends the fourth uplink signal and stops sending uplink signals. The base station device 100 identifies an empty channel in the fifth time resource by carrier sensing without using random backoff. That is, the base station device 100 recognizes that the radio resources from the fifth time resource to the end time of the COT can be used. Therefore, as Figure 6 As shown, the base station apparatus 100 may transmit a downlink signal by using sharable resources.

[0203] The base station device 100 can perform channel access without first performing carrier sensing. Figure 7 An example of this case is shown in . Figure 7 1 is a diagram for describing an example of shared access rights according to the present embodiment. Figure 7 The example shown is similar to Figure 6 The examples shown are the same.

[0204] (2) The physical channel on which the sharable resource information is sent

[0205] The first terminal device 200 (eg, the access authority sharing unit 241 ) may transmit the sharable resource information by using various physical channels.

[0206] —The same physical channel as used for data transmission

[0207] The first terminal device 200 can send the sharable resource information by using a physical channel for data transmission. Such physical channels include, for example, a physical uplink shared channel (PUSCH) and a physical sidelink shared channel (PSSCH). In this case, the first terminal device 200 can apply signal processing such as coding to the data and the sharable resource information together. Therefore, resource efficiency can be improved.

[0208] — A physical channel different from the one used for data transmission

[0209] The first terminal device 200 can transmit the sharable resource information by using a physical channel different from the physical channel used for data transmission. Specifically, the first terminal device 200 multiplexes the physical channel used for data transmission and the physical channel used for transmission of the sharable resource information by means such as time division multiplexing (TDM) or frequency division multiplexing (FDM), and transmits the physical channel. Therefore, the first terminal device 200 can make the target error rate and delay requirements different by applying different MCS or coding methods to the data and the sharable resource information. In addition, in the case where the sharable resource information is continuously transmitted in continuous time resources, the information of the physical channel used for the transmission of the sharable resource information is the same between the continuous time resources. That is, it can be processed as a repeated transmission. Therefore, in the case where the sharable resource information is different between the continuous time resources, the soft combination of the physical channels is facilitated, and the reception quality can be improved.

[0210] Examples of physical channels different from physical channels used for data transmission include physical channels used for transmission of control information. Examples of such physical channels include a physical uplink control channel (PUCCH) and a physical sidelink control channel (PSCCH).

[0211] — Physical channels that can be received commonly among different operators

[0212] The first terminal device 200 can send sharable resource information by using a physical channel (or physical signal) that can be received by different operators. The first terminal device 200 broadcasts sharable resource information by using such a physical channel. Then, the base station device and terminal device of an operator different from the operator providing wireless services to the first terminal device 200 can receive the sharable resource information. In other words, the base station devices and terminal devices of different operators can identify the radio resources to which the first terminal device 200 has obtained access rights. Therefore, the opportunity and accuracy of carrier sensing by the base station devices and terminal devices of different operators are improved. In addition, coordination between different operators is facilitated.

[0213] <3.5. Sharing of the Second Terminal Device>

[0214] Hereinafter, sharing of the access right by the second terminal device 200 will be described in detail.

[0215] (1) Types of shared access rights

[0216] — Sharing access rights via base station device 100

[0217] The sharing of access rights may be performed via the base station device 100. In that case, the first terminal device 200 transmits the sharable resource information to the base station device 100 on the uplink. Then, as described in Section 3.2 (1), the second terminal device 200 transmits a signal by using the sharable resource based on the instruction from the base station device 100. This point will be referred to Figure 8 Give a description.

[0218] Figure 8 is a diagram for describing an example of shared access rights according to the present embodiment. Figure 8 In the example shown, the base station device 100 and the second terminal device 200 correspond to shared communication devices. Figure 8 The upper part of shows carrier sensing performed by the base station apparatus 100 and a signal transmitted by the base station apparatus 100 . Figure 8 The middle part of shows the carrier sensing performed by the first terminal device 200 and the signal sent by the first terminal device 200. Figure 8 The lower part of shows the carrier sensing performed by the second terminal device 200 and the signal transmitted by the second terminal device 200. The rectangle described as DL is the time resource for transmitting the downlink signal. The rectangle described as UL is the time resource for transmitting the downlink signal.

[0219] like Figure 8 As shown, the first terminal device 200 first performs carrier sensing using random backoff and obtains access rights. Next, the first terminal device 200 sends an uplink signal within the COT based on the obtained access rights. At this time, the first terminal device 200 performs uplink transmission of sharable resource information in all time resources in the continuously used time resources. Figure 8 In the example shown, as the sharable resource information, information indicating the remaining time of the COT based on the time resource of transmitting the sharable resource information is transmitted. Figure 8 In the example shown, the first terminal device 200 obtains access rights to eight time resources. Then, the first terminal device 200 performs uplink transmission of sharable resource information in the first time resource, the sharable resource information indicating that access rights to the seven remaining time resources have been obtained.

[0220] Thereafter, the first terminal device 200 performs uplink transmission of sharable resource information in the second time resource, and the sharable resource information indicates that access rights to the six remaining time resources have been obtained. The base station device 100 can identify the remaining time of the COT based on the sharable resource information. The first terminal device 200 finally sends the second uplink signal and stops sending the uplink signal. The base station device 100 identifies an empty channel in the third time resource by carrier sensing without using random backoff. That is, the base station device 100 identifies that the radio resources from the third time resource to the end time of the COT can be used.

[0221] The base station device 100 transmits a downlink signal by using the third to sixth time resources in the sharable resources. In addition, by using the uplink grant, the base station device 100 instructs the second terminal device 200 to perform uplink transmission in the seventh and eighth time resources in the sharable resources. Then, the second terminal device 200 performs carrier sensing without using random backoff, and then transmits an uplink signal by using the seventh and eighth time resources in the sharable resources.

[0222] —Direct sharing of access rights

[0223] Access rights may be directly shared. In that case, the first terminal device 200 transmits the sharable resource information to the second terminal device 200. Typically, the first terminal device 200 may transmit the sharable resource information to the second terminal device 200 on a side link. The transmission method to the second terminal device 200 is not limited to the side link. For example, the first terminal device 200 may transmit a reference signal including sharable resource information for measuring interference between terminal devices. Thereafter, as described in Section 3.2(2), the second terminal device 200 transmits a signal by using sharable resources based on the received sharable resource information. In this case, the second terminal device 200 performs unauthorized transmission. This point will be referred to Fig. 9 Give a description.

[0224] Fig. 9 is a diagram for describing an example of shared access rights according to the present embodiment. Fig. 9 In the example shown, the second terminal device 200 corresponds to a shared communication device. Fig. 9 The upper part of shows carrier sensing performed by the base station apparatus 100 and a signal transmitted by the base station apparatus 100 . Fig. 9 The middle part of shows the carrier sensing performed by the first terminal device 200 and the signal sent by the first terminal device 200. Fig. 9The lower part of shows the carrier sensing performed by the second terminal device 200 and the signal transmitted by the second terminal device 200. The rectangle described as UL is the time resource for transmitting the downlink signal. The rectangle described as SL is the time resource for transmitting the sidelink signal.

[0225] like Fig. 9 As shown, the first terminal device 200 first performs carrier sensing using random backoff and obtains access rights. Next, the first terminal device 200 sends uplink signals and sidelink signals within the COT based on the obtained access rights. At this time, the first terminal device 200 performs uplink transmission and sidelink transmission of sharable resource information in all time resources in the continuously used time resources. Fig. 9 In the example shown, as the sharable resource information, information indicating the remaining time of the COT based on the time resource of transmitting the sharable resource information is transmitted. Fig. 9 In the example shown, the first terminal device 200 obtains access rights to eight time resources. Then, the first terminal device 200 performs uplink transmission and sidelink transmission of sharable resource information in the first time resource, and the sharable resource information indicates that access rights to the seven remaining time resources have been obtained.

[0226] Thereafter, the first terminal device 200 performs uplink transmission and sidelink transmission of sharable resource information in the second time resource, and the sharable resource information indicates that access to the six remaining time resources has been obtained. The second terminal device 200 can identify the remaining time of the COT based on the sharable resource information sent via the side link. The first terminal device 200 finally sends a second uplink signal and a sidelink signal, and stops sending the uplink signal and the sidelink signal. The second terminal device 200 identifies an empty channel in the third time resource by carrier sensing without using random backoff. That is, the second terminal device 200 recognizes that the radio resources from the third time resource to the end moment of the COT can be used. Therefore, as Fig. 9 As shown, the second terminal device 200 can send an uplink signal by using the sharable resources. At this time, similar to the first terminal device 200, the second terminal device 200 sends the sharable resource information on the uplink. Therefore, for example, after the second terminal device 200 ends the uplink transmission, the base station device 100 can send a downlink signal by using the sharable resources.

[0227] (2) Scope of shareable access rights

[0228] In the case where the similarity between the communication environment and the first terminal device 200 exceeds a predetermined value, the second terminal device 200 (e.g., the communication processing unit 243) sends a signal by using the sharable resource based on the sharable resource information. This is because it is believed that the higher the similarity of the communication environment between the first terminal device 200 and the second terminal device 200, the more similar the carrier sensing results. In other words, the higher the similarity of the communication environment between the first terminal device 200 and the second terminal device 200, the higher the possibility that the signal sent based on the access permission has the same impact on the surrounding environment. By operating the terminal device 200 that meets this condition as the second terminal device 200, it is possible to prevent the second terminal device 200 from causing unexpected interference to the surrounding environment when sending a signal by using the sharable resource.

[0229] The similarity in the communication environment may be determined based on information indicating the distance between the terminal devices 200. For example, based on whether the path loss between the terminal devices 200 or the geographical distance between the terminal devices 200 is equal to or less than a predetermined value, it may be determined whether the similarity in the communication environment exceeds a predetermined value. This will be referred to in Fig.10 Provide a detailed description.

[0230] Fig.10 2 is a diagram for describing the sharing of access rights by the second terminal device 200 according to this embodiment. Fig.10 As shown, terminal devices 200A, 200B, and 200C are located in a cell 11 operated by a base station device 100, and each device is communicating with the base station device 100. It is likely that the surrounding environment is similarly affected between terminal devices 200 having close transmission points. Therefore, it is desirable that a plurality of terminal devices 200 having close transmission points share access rights. Fig.10 In the example shown, it is assumed that the terminal device 200A is used as the first terminal device 200 and obtains the access right. The terminal device 200A can detect the signal sent from the communication device located in the carrier sensing range 12 by carrier sensing. Incidentally, the carrier sensing range 12 is a range that can produce an influence (i.e., interference) when the terminal device 200A transmits a signal, and expands / contracts according to the transmission power assumed to be used when the terminal device 200A transmits a signal. The terminal device 200B is located in the carrier sensing range 12, so the impact on the surrounding environment may be the same as that of the terminal device 200A. Therefore, it is expected that the terminal device 200B is used as the second terminal device 200 and shares the access right obtained by the terminal device 200A. On the other hand, the terminal device 200C is located outside the carrier sensing range 12, so the impact on the surrounding environment may be different from that of the terminal device 200A. Therefore, it is expected that the terminal device 200C does not share the access right obtained by the terminal device 200A.

[0231] The similarity of the communication environment can be determined based on the information about the interference condition. For example, it can be determined whether the similarity of the communication environment exceeds a predetermined value based on whether the degree of channel congestion between the terminal devices 200 or the difference in received signal strength indicator (RSSI) is equal to or less than a predetermined value.

[0232] The similarity of the communication environment can be determined based on the information about the transmission destination. For example, it can be determined whether the similarity of the communication environment exceeds a predetermined value based on whether the difference in the direction of the transmission destination or the direction of the beam between the terminal devices 200 is equal to or less than a predetermined value. By the way, this indicator is particularly useful when performing carrier sensing using beamforming.

[0233] A plurality of terminal devices 200 that can share access rights can be grouped. The grouping is performed based on the similarity of the communication environment, for example, as described above. The grouping is usually performed by the base station device 100 (e.g., the access rights sharing unit 151). Then, each terminal device 200 is set from the base station device 100 using information indicating the group to which the terminal device belongs.

[0234] (3) Shareable resource information

[0235] Hereinafter, regarding sharing of the access right by the second terminal device 200, information that may be included in the sharable resource information will be described.

[0236] Information about the communication environment

[0237] The sharable resource information may include the information about the communication environment described above. Therefore, the second terminal device 200 may calculate the similarity with the communication environment of the first terminal device 200 based on the received sharable resource information, and determine whether the access right may be shared.

[0238] For example, the sharable resource information may include information indicating the geographical location or transmission power of the first terminal device 200. Therefore, the second terminal device 200 may determine the similarity of the communication environments based on the information indicating the distance between the terminal devices 200.

[0239] For example, the sharable resource information may include information indicating the RSSI or the channel congestion degree of the first terminal device 200. Therefore, the second terminal device 200 may determine the similarity of the communication environment based on the information about the interference status.

[0240] For example, the sharable resource information may include information indicating a transmission destination direction or a beam direction of the first terminal device 200. Therefore, the second terminal device 200 may determine the similarity of the communication environments based on the information about the transmission destination.

[0241] Group information

[0242] The sharable resource information may include information indicating a group that can share the access right. The information indicating the group that can share the access right may include identification information, such as an ID and C-RNTI of each terminal device 200 of the plurality of terminal devices 200 that can share the access right, an ID of the group, etc. Referring to the information included in the received sharable resource information and indicating the group that can share the access right, the second terminal device 200 may determine whether the access right can be shared based on the received sharable resource information.

[0243] For example, the first terminal device 200 sends information indicating the group to which the first terminal device 200 belongs while including the information indicating the group to which the first terminal device 200 belongs in the sharable resource information. If the group to which the first terminal device 200 belongs is the same as that of the second terminal device 200, the second terminal device 200 determines that the access authority acquired by the first terminal device 200 can be shared.

[0244] (4) Communication parameters

[0245] The first terminal device 200 and the second terminal device 200 share communication parameters to be used in the sharable resource.

[0246] The first terminal device 200 and the second terminal device 200 may directly share the communication parameters to be used in the sharable resource through D2D communication. Alternatively, the first terminal device 200 and the second terminal device 200 may indirectly share the communication parameters to be used in the sharable resource via the base station device 100. In addition, the base station device 100 may determine the communication parameters to be used in the sharable resource and send the communication parameters to each terminal device 200.

[0247] Examples of information that may be included in the communication parameters will be described below.

[0248] Upper limit of transmission power

[0249] The communication parameters to be used in the sharable resources may include information indicating an upper limit of the transmission power that the second terminal device 200 can use in the sharable resources.

[0250] The second terminal device 200 (for example, the communication processing unit 243) transmits a signal at a transmission power equal to or less than the transmission power assumed in the carrier sense performed when the first terminal device 200 acquires the access right. Fig.10In the example shown, the terminal device 200B transmits a signal in the sharable resource by using a transmission power equal to or less than the transmission power assumed in the carrier sensing performed when the terminal device 200A acquires the access right. Therefore, it is possible to prevent accidental interference from occurring when the second terminal device 200 transmits a signal in the sharable resource.

[0251] Channel access parameters

[0252] The communication parameters to be used in the sharable resource may include parameters for channel access.

[0253] It is desirable that the first terminal device 200 and the second terminal device 200 use the same channel access parameters. When at least a part of the channel access parameters is updated, it is desirable that the updated channel access parameters be shared.

[0254] The parameters of channel access include the size of the contention window and the threshold of carrier sensing. In addition, the parameters of channel access include the maximum transmit power, antenna gain and beam gain.

[0255] (5) Supplement

[0256] There may be multiple second terminal devices 200. In that case, for example, multiple second terminal devices 200 use the sharable resources in sequence. In the case where multiple second terminal devices 200 support non-orthogonal multiple access (NOMA) communication, signals may be non-orthogonal (NOMA) multiplexed in the same sharable resource to be transmitted.

[0257] When the first terminal device 200 and the second terminal device 200 support NOMA communication, the signal can be non-orthogonally multiplexed in the same radio resource to be transmitted. In this case, the second terminal device 200 can transmit the signal without waiting for the first terminal device 200 to finish using the radio resource.

[0258] <3.6. Processing Flow>

[0259] (1) Processing flow of the first terminal device 200

[0260] Fig.11 : is a flowchart showing an example of the flow of the access authority sharing process performed by the first terminal device 200 according to the present embodiment.

[0261] like Fig.11 As shown, first, the communication processing unit 243 performs carrier sensing using random backoff and obtains access rights (step S102). Next, the access rights sharing unit 241 performs uplink transmission and / or sidelink transmission of the signal of the transmission object and the sharable resource information in the radio resources for which the access rights have been obtained (step S104).

[0262] (2) Processing flow of base station device 100

[0263] Fig.12 : is a flowchart showing an example of the flow of access right sharing processing performed by the base station device 100 according to the present embodiment.

[0264] like Fig.12 As shown, first, the access permission sharing unit 151 receives the sharable resource information sent from the first terminal device 200 via the uplink (step S202). Next, the communication processing unit 153 performs carrier sensing without random backoff on the sharable resources, and identifies the end of the transmission of the first terminal device 200 (step S204). Next, the communication processing unit 153 sends a downlink signal in the sharable resources (step S206). Next, the access permission sharing unit 151 sends an uplink authorization indicating that an uplink transmission is to be performed in the sharable resources to the second terminal device 200 (step S208). Then, the communication processing unit 153 receives an uplink signal from the second terminal device 200 in the sharable resources (step S210).

[0265] Incidentally, the above-mentioned steps S206 and S208 may be performed simultaneously, or the order may be reversed.

[0266] (3) Processing flow of the second terminal device 200

[0267] Fig.13 is a flowchart showing an example of the flow of access right sharing processing performed by the second terminal device 200 according to the present embodiment. Figure 8 An example in the case of sharing the access authority via the base station device 100 is described.

[0268] like Fig.13 As shown, first, the access right sharing unit 241 gives an instruction to perform uplink transmission in the sharable resources for which the access right is acquired by the first terminal device 200.

[0269] An uplink grant is received from the base station device 100 (step S302). Then, the communication processing unit 243 transmits an uplink signal in the sharable resource according to the uplink grant (step S304).

[0270] Fig.14 is a flowchart showing an example of the flow of access right sharing processing performed by the second terminal device 200 according to the present embodiment. Fig. 9 An example of a case where direct shared access rights are described.

[0271] like Fig.14As shown, first, the access permission sharing unit 241 receives the sharable resource information transmitted from the first terminal device 200 through the side link (step S402). Next, the communication processing unit 243 performs carrier sensing without random backoff in the sharable resource, and recognizes the end of transmission of the first terminal device 200 (step S404). Then, the communication processing unit 243 transmits a side link signal or an uplink signal in the sharable resource (step S406).

[0272] <4. Application Examples>

[0273] The technology according to the present disclosure can be applied to various products. For example, the base station device 100 can be implemented as any type of evolved node B (eNB), such as a macro eNB or a small eNB. A small eNB can be an eNB that covers a cell smaller than a macro cell, such as a micro eNB, a micro eNB, or a home (femto) eNB. Instead, the base station device 100 can be implemented as another type of base station, such as a node B or a base transceiver station (BTS). The base station device 100 may include a main entity (also referred to as a base station device) that controls wireless communication, and one or more remote radio heads (RRHs) arranged at locations different from the main entity. In addition, the various types of terminals to be described below can be used as a base station device 100 by temporarily or semi-permanently performing base station functions.

[0274] For example, the terminal device 200 may be implemented as a mobile terminal such as a smart phone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable / adapter-type mobile router, or a digital camera, or as a vehicle-mounted terminal such as a car navigation device. In addition, the terminal device 200 may be implemented as a terminal that performs machine-to-machine (M2M) communication (also referred to as a machine-type communication (MTC) terminal). In addition, the terminal device 200 may be a wireless communication module (e.g., an integrated circuit module constructed on one die) installed on these terminals.

[0275] <4.1. Application examples of base station equipment>

[0276] (First application example)

[0277] Fig.15 8 is a block diagram showing a first example of a schematic configuration of an eNB to which the technology according to the present disclosure can be applied. The eNB 800 includes one or more antennas 810 and a base station device 820. Each antenna 810 and the base station device 820 may be connected to each other via an RF cable.

[0278] Each of the antennas 810 includes a single or multiple antenna elements (eg, multiple antenna elements constituting a MIMO antenna), and is used in the base station device 820 to transmit and receive wireless signals. Fig.15 As shown, a plurality of antennas 810 may be included, and the plurality of antennas 810 may correspond to, for example, a plurality of frequency bands used by the eNB 800. Fig.15 An example is shown in which the eNB 800 includes a plurality of antennas 810 , but the eNB 800 may include a single antenna 810 .

[0279] The base station device 820 includes a controller 821 , a memory 822 , a network interface 823 , and a wireless communication interface 825 .

[0280] The controller 821 may be, for example, a CPU or a DSP, and operates various upper layer functions of the base station device 820. For example, the controller 821 generates a data packet according to the data in the signal processed by the wireless communication interface 825, and transmits the generated packet via the network interface 823. The controller 821 may generate a bound packet by bundling data from a plurality of baseband processors to transmit the generated bound packet. In addition, the controller 821 may also have a logical function of performing controls such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. In addition, the control may be performed in cooperation with surrounding eNBs or core network nodes. The memory 822 includes a RAM and a ROM, and stores programs executed by the controller 821 and various control data (such as a terminal list, transmission power data, and scheduling data).

[0281] The network interface 823 is a communication interface for connecting the base station device 820 to the core network 824. The controller 821 can communicate with the core network node or another eNB via the network interface 823. In this case, the eNB 800 can be connected to the core network node or another eNB through a logical interface (e.g., an S1 interface or an X2 interface). The network interface 823 can be a wired communication interface or a wireless communication interface for wireless backhaul. In the case where the network interface 823 is a wireless communication interface, the network interface 823 can use a higher frequency band than the frequency band used by the wireless communication interface 825 for wireless communication.

[0282] The wireless communication interface 825 supports a cellular communication mode such as long term evolution (LTE) or advanced LTE, and provides a wireless connection to a terminal located in a cell of the eNB 800 via the antenna 810. The wireless communication interface 825 may generally include a baseband (BB) processor 826, an RF circuit 827, and the like. The BB processor 826 may, for example, perform encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and perform various signal processing for each layer (e.g., L1, medium access control (MAC), radio link control (RLC), and packet data convergence protocol (PDCP)). Instead of the controller 821, the BB processor 826 may have a part or all of the logical functions described above. The BB processor 826 may be a module including a memory in which a communication control program is stored, a processor that executes the program, and related circuits, and the function of the BB processor 826 may be changed by updating the program. In addition, the module may be a card or a blade to be inserted into a slot of the base station device 820, or a chip mounted on a card or a blade. On the other hand, the RF circuit 827 may include a mixer, a filter, an amplifier, etc., and transmit and receive wireless signals via the antenna 810.

[0283] Wireless communication interface 825 such as Fig.15 As shown, multiple BB processors 826 are included, and the multiple BB processors 826 can correspond to multiple frequency bands used by the eNB 800, for example. In addition, the wireless communication interface 825 is as shown. Fig.15 As shown, multiple RF circuits 827 may also be included, and the multiple RF circuits 827 may correspond to multiple antenna elements, for example. Note that Fig.15 An example is shown in which the wireless communication interface 825 includes a plurality of BB processors 826 and a plurality of RF circuits 827 , but the wireless communication interface 825 may include a single BB processor 826 or a single RF circuit 827 .

[0284] exist Fig.15 In the eNB 800 shown in FIG. 8 , reference may be implemented in the wireless communication interface 825. Figure 4One or more components (access right sharing unit 151 and / or communication processing unit 153) included in the control unit 150 described above. Alternatively, at least some of these components may be implemented in the controller 821. As an example, the eNB 800 may be implemented with a module including a part (e.g., BB processor 826) or all of the wireless communication interface 825 and / or the controller 821, and the module may be installed with one or more of the components. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to perform the operation of one or more components) and execute the program. As another example, a program for causing the processor to function as one or more components may be installed in the eNB 800, and the wireless communication interface 825 (e.g., BB processor 826) and / or the controller 821 may execute the program. As described above, the eNB 800, the base station device 820, or the module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium having the above-mentioned program recorded thereon may be provided.

[0285] exist Fig.15 In the eNB 800 shown, the reference 820 may be implemented in the wireless communication interface 825 (eg, the RF circuit 827). Figure 4 The wireless communication unit 120 described above. In addition, the antenna unit 110 may be implemented in the antenna 810. In addition, the network communication unit 130 may be implemented in the controller 821 and / or the network interface 823. In addition, the storage unit 140 may be implemented in the memory 822.

[0286] (Second application example)

[0287] Fig.16 8 is a block diagram showing a second example of a schematic configuration of an eNB to which the technology of the present disclosure can be applied. The eNB 830 includes one or more antennas 840, a base station device 850, and an RRH 860. Each of the antennas 840 and the RRH 860 can be connected to each other via an RF cable. In addition, the base station device 850 and the RRH 860 can be connected to each other via a high-speed line such as an optical fiber cable.

[0288] Each of the antennas 840 includes a single or multiple antenna elements (eg, multiple antenna elements constituting a MIMO antenna), and is used for the RRH 860 to transmit and receive wireless signals. Fig.16 As shown, a plurality of antennas 840 may be included, and the plurality of antennas 840 may correspond to, for example, a plurality of frequency bands used by the eNB 830. Fig.16An example is shown in which the eNB 830 includes a plurality of antennas 840 , but the eNB 830 may include a single antenna 840 .

[0289] The base station device 850 includes a controller 851, a memory 852, a network interface 853, a wireless communication interface 855, and a connection interface 857. The controller 851, the memory 852, and the network interface 853 are similar to the reference Fig.15 The controller 821, memory 822, and network interface 823 are described similarly.

[0290] The wireless communication interface 855 supports cellular communication methods such as LTE and Advanced LTE, and provides wireless connection to terminals located in a sector corresponding to the RRH 860 via the RRH 860 and the antenna 840. The wireless communication interface 855 may generally include a BB processor 856 and the like. In addition to the BB processor 856 being connected to the RF circuit 864 of the RRH 860 via the connection interface 857, the BB processor 856 is connected to the reference RF circuit 864 of the RRH 860. Fig.15 The BB processor 826 described above is similar. The wireless communication interface 855 is as shown in FIG. Fig.16 As shown, multiple BB processors 856 may be included, and the multiple BB processors 856 may correspond to multiple frequency bands used by the eNB 830, for example. Note that Fig.16 An example is shown in which the wireless communication interface 855 includes a plurality of BB processors 856 , but the wireless communication interface 855 may include a single BB processor 856 .

[0291] The connection interface 857 is an interface for connecting the base station device 850 (wireless communication interface 855) to the RRH 860. The connection interface 857 may be a communication module for communication on a high-speed line connecting the base station device 850 (wireless communication interface 855) to the RRH 860.

[0292] The RRH 860 includes a connection interface 861 and a wireless communication interface 863 .

[0293] The connection interface 861 is an interface for connecting the RRH 860 (wireless communication interface 863) to the base station device 850. The connection interface 861 may be a communication module for communication on a high-speed line.

[0294] The wireless communication interface 863 sends and receives wireless signals via the antenna 840. The wireless communication interface 863 may generally include an RF circuit 864, etc. The RF circuit 864 may include a mixer, a filter, an amplifier, etc., and sends and receives wireless signals via the antenna 840. The wireless communication interface 863 may include a plurality of components such as a RF circuit 864, a RF circuit 864, and a plurality of components such as a RF circuit 864. Fig.16 As shown, multiple RF circuits 864 may be included, and the multiple RF circuits 864 may correspond to multiple antenna elements, for example. Note that Fig.16 An example is shown in which the wireless communication interface 863 includes a plurality of RF circuits 864 , but the wireless communication interface 863 may include a single RF circuit 864 .

[0295] exist Fig.16 In the eNB 830 shown in FIG. 1 , reference may be implemented in the wireless communication interface 855 and / or the wireless communication interface 863. Figure 4 One or more components (access right sharing unit 151 and / or communication processing unit 153) included in the control unit 150 described above. Alternatively, at least some of these components may be implemented in the controller 851. As an example, the eNB 830 may be installed with a module including a part (e.g., BB processor 856) or all of the wireless communication interface 855 and / or the controller 851, and the module may be installed with one or more of the components. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to perform the operation of one or more components) and execute the program. As another example, a program for causing the processor to function as one or more components may be installed in the eNB 830, and the wireless communication interface 855 (e.g., BB processor 856) and / or the controller 851 may execute the program. As described above, the eNB 830, the base station device 850, or the module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium having the above-mentioned program recorded thereon may be provided.

[0296] exist Fig.16 In the eNB 830 shown, for example, the reference may be implemented in the wireless communication interface 863 (eg, the RF circuit 864). Figure 4 The wireless communication unit 120 described above. In addition, the antenna unit 110 may be implemented in the antenna 840. In addition, the network communication unit 130 may be implemented in the controller 851 and / or the network interface 853. In addition, the storage unit 140 may be implemented in the memory 852.

[0297] <4.2. Application examples of terminal devices>

[0298] (First application example)

[0299] Fig.17900 is a block diagram showing an example of a schematic configuration of a smartphone 900 to which the technology according to the present disclosure can be applied. The smartphone 900 includes a processor 901, a memory 902, a storage device 903, an external connection interface 904, a camera 906, a sensor 907, a microphone 908, an input device 909, a display device 910, a speaker 911, a wireless communication interface 912, one or more antenna switches 915, one or more antennas 916, a bus 917, a battery 918, and an auxiliary controller 919.

[0300] The processor 901 may be, for example, a CPU or a system on chip (SoC), and controls functions of an application layer and other layers of the smartphone 900. The memory 902 includes a RAM and a ROM, and stores programs and data executed by the processor 901. The storage device 903 may include storage media such as semiconductor memories and hard disks. The external connection interface 904 is an interface for connecting an external attachment device such as a memory card and a universal serial bus (USB) device to the smartphone 900.

[0301] The camera 906 includes, for example, an image sensor such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), and generates a captured image. The sensor 907 may include a sensor group including, for example, a positioning sensor, a gyroscope sensor, a geomagnetic sensor, an acceleration sensor, etc. The microphone 908 converts the sound input to the smart phone 900 into an audio signal. The input device 909 includes, for example, a touch sensor, a keypad, a keyboard, a button, a switch, etc., which detect that the screen of the display device 910 is touched, and accepts an operation or information input from a user. The display device 910 includes a screen such as a liquid crystal display (LCD) and an organic light emitting diode (OLED) display, and displays an output image of the smart phone 900. The speaker 911 converts the audio signal output from the smart phone 900 into sound.

[0302] The wireless communication interface 912 supports a cellular communication method such as LTE or Advanced LTE, and performs wireless communication. The wireless communication interface 912 may generally include a BB processor 913, an RF circuit 914, and the like. The BB processor 913 may, for example, perform encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and perform various types of signal processing for wireless communication. On the other hand, the RF circuit 914 may include a mixer, a filter, an amplifier, and the like, and transmit and receive wireless signals via an antenna 916. The wireless communication interface 912 may be a single-chip module in which the BB processor 913 and the RF circuit 914 are integrated. Fig.17 As shown, the wireless communication interface 912 may include multiple BB processors 913 and multiple RF circuits 914. Note that Fig.17An example is shown in which the wireless communication interface 912 includes a plurality of BB processors 913 and a plurality of RF circuits 914 , but the wireless communication interface 912 may include a single BB processor 913 or a single RF circuit 914 .

[0303] In addition to the cellular communication mode, the wireless communication interface 912 can also support other types of wireless communication modes, such as a short-range wireless communication mode, a near-field communication mode, and a wireless local area network (LAN) mode, and in this case, the wireless communication interface 912 may include a BB processor 913 and an RF circuit 914 for each wireless communication mode.

[0304] Each antenna switch 915 switches the connection destination of the antenna 916 between a plurality of circuits (for example, circuits for different wireless communication methods) included in the wireless communication interface 912 .

[0305] Each of the antennas 916 includes one or more antenna elements (eg, multiple antenna elements constituting a MIMO antenna) and is used by the wireless communication interface 912 to send and receive wireless signals. Fig.17 As shown, the smart phone 900 may include multiple antennas 916. Note that Fig.17 An example is shown in which the smartphone 900 includes a plurality of antennas 916 , but the smartphone 900 may include a single antenna 916 .

[0306] The smartphone 900 may include an antenna 916 for each wireless communication method. In this case, the antenna switch 915 may be omitted from the configuration of the smartphone 900.

[0307] The bus 917 mutually connects the processor 901, the memory 902, the storage device 903, the external connection interface 904, the camera 906, the sensor 907, the microphone 908, the input device 909, the display device 910, the speaker 911, the wireless communication interface 912, and the auxiliary controller 919. The battery 918 is fed to the battery 918 via a feed line partially indicated by a dotted line in the drawing. Fig.17 Each block of the illustrated smartphone 900 supplies power. The auxiliary controller 919 operates the minimum necessary functions of the smartphone 900, for example, in a sleep mode.

[0308] exist Fig.17 In the illustrated smart phone 900, reference may be implemented in the wireless communication interface 912. Figure 5One or more components (access right sharing unit 241 and / or communication processing unit 243) included in the control unit 240 described. Alternatively, at least some of these components may be implemented in the processor 901 or the auxiliary controller 919. As an example, the smart phone 900 may be installed with a module including a part (e.g., BB processor 913) or all of the wireless communication interface 912, the processor 901 and / or the auxiliary controller 919, and the module may be implemented with one or more of the components. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to perform the operation of one or more components), and execute the program. As another example, a program for causing the processor to function as one or more components may be installed in the smart phone 900, and the wireless communication interface 912 (e.g., BB processor 913), the processor 901 and / or the auxiliary controller 919 may execute the program. As described above, the smart phone 900 or the module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium having the above-mentioned program recorded thereon may be provided.

[0309] exist Fig.17 In the illustrated smart phone 900, for example, the reference signal may be implemented in the wireless communication interface 912 (eg, the RF circuit 914). Figure 5 The wireless communication unit 220 described above. In addition, the antenna unit 210 may be implemented in the antenna 916. In addition, the storage unit 230 may be implemented in the memory 902.

[0310] (Second application example)

[0311] Fig.18 9 is a block diagram showing an example of a schematic configuration of a car navigation device 920 to which the technology according to the present disclosure can be applied. The car navigation device 920 includes a processor 921, a memory 922, a global positioning system (GPS) module 924, a sensor 925, a data interface 926, a content player 927, a storage medium interface 928, an input device 929, a display device 930, a speaker 931, a wireless communication interface 933, one or more antenna switches 936, one or more antennas 937, and a battery 938.

[0312] The processor 921 may be, for example, a CPU or an SoC, and controls a navigation function and other functions of the car navigation device 920. The memory 922 includes a RAM and a ROM, and stores programs executed by the processor 921 and data.

[0313] The GPS module 924 measures the position (e.g., latitude, longitude, and altitude) of the car navigation device 920 using GPS signals received from GPS satellites. The sensor 925 may include a sensor group including, for example, a gyroscope sensor, a geomagnetic sensor, and an air pressure sensor. The data interface 926 is connected to the vehicle network 941, for example, via a terminal not shown, and acquires data generated on the vehicle side, such as vehicle speed data.

[0314] The content player 927 reproduces the content stored in the storage medium (e.g., CD or DVD) inserted into the storage medium interface 928. The input device 929 includes, for example, a touch sensor, a button, a switch, etc. that detects that the screen of the display device 930 is touched, and accepts an operation or information input from a user. The display device 930 includes a screen such as an LCD and an OLED display, and displays the reproduced content or an image of a navigation function. The speaker 931 outputs the reproduced content or the sound of the navigation function.

[0315] The wireless communication interface 933 supports a cellular communication method such as LTE or Advanced LTE, and performs wireless communication. The wireless communication interface 933 may generally include a BB processor 934, an RF circuit 935, and the like. The BB processor 934 may, for example, perform encoding / decoding, modulation / demodulation, multiplexing / demultiplexing, and the like, and perform various types of signal processing for wireless communication. On the other hand, the RF circuit 935 may include a mixer, a filter, an amplifier, and the like, and transmit and receive wireless signals via an antenna 937. The wireless communication interface 933 may be a single-chip module in which the BB processor 934 and the RF circuit 935 are integrated. Fig.18 As shown, the wireless communication interface 933 may include multiple BB processors 934 and multiple RF circuits 935. Note that Fig.18 An example is shown in which the wireless communication interface 933 includes a plurality of BB processors 934 and a plurality of RF circuits 935 , but the wireless communication interface 933 may include a single BB processor 934 or a single RF circuit 935 .

[0316] In addition to the cellular communication mode, the wireless communication interface 933 can also support other types of wireless communication modes, such as a short-range wireless communication mode, a near field communication mode and a wireless LAN mode, and in this case, the wireless communication interface 933 may include a BB processor 934 and an RF circuit 935 for each wireless communication mode.

[0317] Each antenna switch 936 switches the connection destination of the antenna 937 between a plurality of circuits (for example, circuits for different wireless communication methods) included in the wireless communication interface 933 .

[0318] Each of the antennas 937 includes one or more antenna elements (eg, a plurality of antenna elements constituting a MIMO antenna), and is used by the wireless communication interface 933 to transmit and receive wireless signals. Fig.18 As shown, the car navigation device 920 may include multiple antennas 937. Note that Fig.18 An example is shown in which the car navigation device 920 includes a plurality of antennas 937 , but the car navigation device 920 may include a single antenna 937 .

[0319] The car navigation device 920 may include an antenna 937 for each wireless communication method. In this case, the antenna switch 936 may be omitted from the configuration of the car navigation device 920.

[0320] The battery 938 is supplied to the Fig.18 Each block of the illustrated car navigation device 920 is supplied with electric power. In addition, the battery 938 accumulates electric power supplied from the vehicle.

[0321] exist Fig.18 In the car navigation device 920 shown in FIG. 1 , reference may be implemented in the wireless communication interface 933 Figure 5 One or more components (access right sharing unit 241 and / or communication processing unit 243) included in the control unit 240 described. Alternatively, at least some of these components may be implemented in the processor 921. As an example, the car navigation device 920 may be installed with a module including a part (e.g., BB processor 934) or all of the wireless communication interface 933 and / or the processor 921, and the module may be implemented with one or more of the components. In this case, the module may store a program for causing the processor to function as one or more components (in other words, a program for causing the processor to perform operations of one or more components), and execute the program. As another example, a program for causing the processor to function as one or more components may be installed in the car navigation device 920, and the wireless communication interface 933 (e.g., BB processor 934) and / or the processor 921 may execute the program. As described above, the car navigation device 920 or the module may be provided as a device including one or more components, and a program for causing the processor to function as one or more components may be provided. In addition, a readable recording medium having the above-mentioned program recorded thereon may be provided.

[0322] exist Fig.18 In the illustrated automobile navigation device 920, for example, the reference signal may be implemented in the wireless communication interface 933 (eg, the RF circuit 935). Figure 5 The wireless communication unit 220 described above. In addition, the antenna unit 210 may be implemented in the antenna 937. In addition, the storage unit 230 may be implemented in the memory 922.

[0323] The technology of the present disclosure may also be implemented as an in-vehicle system (or vehicle) 940 including one or more blocks of the above-mentioned car navigation device 920, an in-vehicle network 941, and a vehicle module 942. The vehicle module 942 generates vehicle data such as vehicle speed, engine revolutions, and fault information, and outputs the generated data to the in-vehicle network 941.

[0324] <5. Conclusion>

[0325] Referenced above Figures 1 to 18 An embodiment of the present disclosure is described in detail. As described above, according to the present embodiment, the first terminal device 200 transmits sharable resource information on an uplink or a sidelink, and the sharable resource information indicates radio resources available to another communication device in the radio resources whose access rights are acquired by performing carrier sensing using random backoff. Therefore, another communication device can send a signal by sharing the access rights acquired by the first terminal device 200. Here, the access rights have been acquired by the first terminal device 200, so the other communication device performs channel access without performing carrier sensing using random backoff. Therefore, compared with the case of performing carrier sensing using random backoff, the waiting time for channel access is reduced, and the efficiency of use of radio resources can be improved.

[0326] The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the technical scope of the present disclosure is not limited to such examples. Obviously, a person skilled in the art in the field to which the present disclosure belongs can think of various changes or modifications within the scope of the technical ideas described in the claims. Of course, it is understood that they belong to the technical scope of the present disclosure.

[0327] In addition, the processes described in this specification with reference to the flowcharts and sequence diagrams do not necessarily have to be performed in the order shown. Some processing steps can be performed in parallel. In addition, additional processing steps can be adopted, and some processing steps can be omitted.

[0328] In addition, the effects described in this specification are only illustrative or exemplary and are not limiting. That is, in addition to or instead of the above effects, the technology according to the present disclosure may also exhibit other effects that are obvious to those skilled in the art based on the description of this specification.

[0329] Note that the following configurations also belong to the technical scope of the present disclosure.

[0330] (1) A terminal device comprising:

[0331] A control unit is configured to transmit, on an uplink or a sidelink, first resource information indicating a radio resource available to another communication device among radio resources for which an access right is acquired by performing carrier sensing.

[0332] (2) The terminal device according to (1), wherein the first resource information includes information indicating a radio resource for which access rights are acquired by the terminal device.

[0333] (3) The terminal device according to claim (2), wherein the first resource information includes information indicating an interval from a time resource at which the first resource information is transmitted to a last time resource in radio resources for which the terminal device acquires access rights.

[0334] (4) The terminal device according to claim (2) or (3), wherein the first resource information includes information indicating a last time resource among radio resources for which access rights are acquired by the terminal device.

[0335] (5) The terminal device according to any one of claims (2) to (4), wherein the first resource information includes information indicating a first time resource of a radio resource for which access rights are acquired by the terminal device.

[0336] (6) The terminal device according to any one of claims (2) to (5), wherein the first resource information includes information indicating a channel access priority level of a radio resource for which access rights are acquired by the terminal device.

[0337] (7) The terminal device according to any one of claims (2) to (6), wherein the first resource information includes information indicating a radio resource to be used by the terminal device among radio resources for which access rights are acquired by the terminal device.

[0338] (8) The terminal device according to any one of claims (1) to (7), wherein the control unit transmits the first resource information in a part of the continuously used time resource.

[0339] (9) The terminal device according to any one of claims (1) to (7), wherein the control unit transmits the first resource information in all time resources of the continuously used time resources.

[0340] (10) The terminal device according to any one of claims (1) to (9), wherein the control unit transmits the first resource information by using a physical channel different from a physical channel used for data transmission.

[0341] (11) The terminal device according to any one of claims (1) to (10), wherein the control unit transmits the first resource information by using a physical channel that can be commonly received by different operators.

[0342] (12) A terminal device according to any one of claims (1) to (11), wherein, when the control unit receives second resource information, the control unit sends a signal by using radio resources available to another communication device, and the second resource information indicates radio resources available to another communication device other than the other terminal device among the radio resources to which the other terminal device obtains its access right by performing carrier sensing.

[0343] (13) The terminal device according to (12), wherein a type of signal transmittable by using radio resources available to another communication device is limited.

[0344] (14) The terminal device according to claim (12) or (13), wherein the control unit transmits the signal at a transmission power equal to or smaller than a transmission power assumed in carrier sensing performed when another terminal device acquires access rights.

[0345] (15) The terminal device according to any one of claims (12) to (14), wherein, when the similarity of the communication environment with another terminal device exceeds a predetermined value, the control unit transmits the signal by using resources available to the other communication device.

[0346] (16) The terminal device according to (15), wherein the second resource information includes information on a communication environment.

[0347] (17) A base station device, comprising:

[0348] A control unit is configured to receive resource information from a terminal device, the resource information indicating resources available to another communication device other than the terminal device among radio resources to which the terminal device obtains access rights by performing carrier sensing, and the control unit is configured to communicate using the resources available to the other communication device.

[0349] (18) The base station device according to (17), wherein the control unit transmits the signal by using a radio resource available to another communication device based on the resource information.

[0350] (19) The base station device according to claim (17), wherein the control unit transmits an authorization message to another terminal device other than the terminal device based on the resource information, the authorization message giving an instruction on transmitting a signal in a radio resource available to the other communication device.

[0351] (20) A method executed by a processor, comprising:

[0352] First resource information indicating a radio resource available to another communication device among radio resources for which access rights are acquired by performing carrier sensing is transmitted on an uplink or a sidelink.

[0353] Reference numerals list

[0354] 1 System

[0355] 11 Community

[0356] 12 Carrier sense range

[0357] 20 Core Network

[0358] 30 PDN

[0359] 100 Base Station Equipment

[0360] 110 antenna units

[0361] 120 Wireless Communication Unit

[0362] 130 Network Communication Unit

[0363] 140 storage units

[0364] 150 Control Unit

[0365] 151 Access Rights Sharing Unit

[0366] 153 Communication Processing Unit

[0367] 200 Terminal Devices

[0368] 210 antenna units

[0369] 220 Wireless Communication Unit

[0370] 230 storage units

[0371] 240 Control Unit

[0372] 241 Access Rights Sharing Unit

[0373] 243 Communication Processing Unit

Claims

1. A base station device, comprising: Radio transceivers; and The control circuit is configured as follows: Controlling the radio transceiver to receive channel occupancy time COT information from a user equipment on a physical uplink shared channel PUSCH, wherein The COT information is information used to share the COT between the base station device and the user equipment, and The COT information indicates the following: The first information indicates the start time of the base station device to start sharing the COT. second information indicating the length of the COT period during which the base station device can share the COT, and third information indicating a channel access priority level; and Based on the COT information, the radio transceiver is controlled to send a signal.

2. The base station device according to claim 1, wherein: The control circuit is further configured to perform channel access without performing carrier sensing based on the COT information.

3. The base station device according to claim 2, wherein: The COT information also indicates the number of time slots, and The control circuit is further configured to: adding the number of time slots to the time slot number of the received COT information; and The remaining duration of the COT is identified based on the number of time slots added.

4. A user equipment, comprising: The control circuit is configured as follows: Control the radio transceiver of the user equipment to send channel occupation time COT information to the base station equipment on the physical uplink shared channel PUSCH, wherein The COT information is information used to share the COT between the base station device and the user equipment, and The COT information indicates the following: The first information indicates the start time of the base station device to start sharing the COT. second information indicating the length of the COT period during which the base station device can share the COT, and third information indicating a channel access priority level; and The radio transceiver is controlled to receive a signal from the base station device, wherein the control of the radio transceiver is based on the COT information.

5. The user equipment according to claim 4, wherein: The base station device performs channel access based on the COT information without performing carrier sensing.

6. The user equipment according to claim 5, wherein: The COT information also indicates the number of time slots, and The base station device further: adding the number of time slots to the time slot number in which the COT information is sent; and The remaining duration of the COT is identified based on the number of time slots added.

7. A non-transitory computer-readable medium having computer-executable instructions stored thereon, which, when executed by a control circuit of a user device, cause the control circuit to perform operations, the operations comprising: Control the radio transceiver of the user equipment to send channel occupation time COT information to the base station equipment on the physical uplink shared channel PUSCH, wherein The COT information is information used to share the COT between the base station device and the user equipment, and The COT information indicates the following: The first information indicates the start time of the base station device to start sharing the COT. second information indicating the length of the COT period during which the base station device can share the COT, and third information indicating a channel access priority level; and The radio transceiver is controlled to receive a signal from the base station device, wherein the control of the radio transceiver is based on the COT information.

8. The non-transitory computer readable medium of claim 7, wherein: The base station device performs channel access based on the COT information without performing carrier sensing.

9. The non-transitory computer readable medium of claim 8, wherein: The COT information also indicates the number of time slots, and The base station device further: adding the number of time slots to the time slot number in which the COT information is sent; and The remaining duration of the COT is identified based on the number of time slots added.

10. A method comprising: In the base station equipment: Controlling the radio transceiver of the base station device to receive channel occupancy time COT information from the user equipment on the physical uplink shared channel PUSCH, wherein The COT information is information used to share the COT between the base station device and the user equipment, and The COT information indicates the following: The first information indicates the start time of the base station device to start sharing the COT. second information indicating the length of the COT period during which the base station device can share the COT, and third information indicating a channel access priority level; and Based on the COT information, the radio transceiver is controlled to send a signal. The method of claim 10 , further comprising performing channel access without performing carrier sensing based on the COT information.

12. The method according to claim 11, wherein: The COT information also indicates the number of time slots, and The method further comprises: adding the number of time slots to the time slot number of the received COT information; and The remaining duration of the COT is identified based on the number of time slots added.

13. A method comprising: On the user device: Control the radio transceiver of the user equipment to send channel occupancy time COT information to the base station equipment on the physical uplink shared channel PUSCH, wherein The COT information is information used to share the COT between the base station device and the user equipment, and The COT information indicates the following: The first information indicates the start time of the base station device to start sharing the COT. second information indicating the length of the COT period during which the base station device can share the COT, and third information indicating a channel access priority level; and The radio transceiver is controlled to receive a signal from the base station device, wherein the control of the radio transceiver is based on the COT information. 14 . The method according to claim 13 , wherein the base station device performs channel access based on the COT information without performing carrier sensing.

15. The method according to claim 14, wherein: The COT information also indicates the number of time slots, and The base station device further: adding the number of time slots to the time slot number in which the COT information is sent; and The remaining duration of the COT is identified based on the number of time slots added.

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