JP2022061174A - Communication device and base station - Google Patents

Abstract

To enable a base station to utilize effective information on a channel state.SOLUTION: A communication device (100) according to one aspect of the present disclosure includes: a generation part (141) that generates channel state information by measurement based on a downlink reference signal; and a communication processing part (143) that transmits timing information on timing (25) when the channel state information takes effect and the channel state information by an uplink.SELECTED DRAWING: Figure 12

Description

The present disclosure relates to communication devices and base stations.

In recent years, mobile communication technology has been proposed in the 3GPP (3rd Generation Partnership Project) and standardized as a technical specification (TS). At present, LTE (Long Term Evolution) technology has matured, and 5G (5th Generation) technology is being studied.

For example, according to Non-Patent Document 1, in a 3GPP mobile communication network, a user equipment (UE) performs measurement based on a reference signal transmitted by a base station, and channel state information (Channel State Information: UE). CSI) is generated and the CSI is transmitted to the base station. Further, the base station performs downlink scheduling based on the CSI. The CSI includes, for example, a Channel Quality Indicator (CQI). Further, in the 3GPP mobile communication network, the UE transmits a reference signal, and the base station schedules the uplink based on the measurement result (that is, information regarding the state of the channel) based on the reference signal.

For example, in Patent Document 1, information (for example, precoder information, modulation information, etc.) configured for the UE to be used in a future transmission time interval (TTI) is eNB (evolved Node B). It is disclosed to receive from and estimate the CQI based on the information. For example, Non-Patent Document 2 discloses a method for predicting CSI.

Patent No. 596649

3GPP TS 38.214 V16.1.0 (2020-03) “3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical layer procedures for data (Release 16)” A.S.Konstantinov and A.V.Pestryakov, "Fading Channel Prediction for 5G," 2019 Systems of Signal Synchronization, Generating and Processing in Telecommunications (SYNCHROINFO), Russia, 2019, pp. 1-7, doi: 10.1109 / SYNCHROINFO.2019.8813950.

According to the technique disclosed in Patent Document 1, CQI premised on the configuration information (for example, precoder information, modulation information, etc.) in future TTI can be obtained. However, as a result of the inventor's detailed examination, the above-mentioned CQI is information indicating the quality of the channel in the TTI in which the reference signal is received, so that the above-mentioned CQI deteriorates in the future TTI where the state of the channel may fluctuate. The problem was found that it could be done.

According to the technique disclosed in Patent Document 2, the predicted CSI can be obtained. However, as a result of detailed examination by the inventor, it has been found that even if the CSI is predicted by the UE, the base station cannot know when the CSI should be used. Further, as a result of the inventor's detailed examination, when the CSI is predicted by the base station, the processing in the base station becomes complicated, and it may be difficult for the base station to secure sufficient time for scheduling. , Was also found.

Also, for the uplink, the inventor can change the state of the channel in the future time from the state of the channel at the time when the UE transmitted the reference signal, so that the result of the measurement based on the reference signal (that is, the channel state). We also found the problem that the information on the state) can deteriorate in the above-mentioned future time.

This disclosure is intended to make available to base stations useful information about the state of the channel.

The communication device according to one aspect of the present disclosure includes a generation unit that generates channel state information by measurement based on a downlink reference signal, timing information regarding the timing at which the channel state information becomes valid, and the channel state information. , A communication processing unit for transmitting by uplink.

The base station according to one aspect of the present disclosure relates to a transmission processing unit that transmits a downlink reference signal, channel state information generated by measurement based on the downlink reference signal, and timing at which the channel state information becomes valid. It includes a reception processing unit that receives timing information from a communication device.

The communication device according to one aspect of the present disclosure includes a generation unit that generates timing information regarding the timing at which the measurement result based on the uplink reference signal transmitted by the communication device becomes valid, and transmission of the timing information by uplink. A communication processing unit and a communication processing unit are provided.

The base station according to one aspect of the present disclosure includes a reception processing unit that receives an uplink reference signal transmitted by a communication device, and the reception processing unit effectively obtains a measurement result based on the uplink reference signal. The timing information regarding the timing is received from the above communication device.

According to the present disclosure, useful information regarding the state of the channel can be used by the base station. It should be noted that, according to the present disclosure, other effects may be produced in place of or in combination with the effect.

It is explanatory drawing which shows an example of the schematic structure of the communication system which concerns on embodiment of this disclosure. It is a block diagram which shows the example of the schematic functional structure of the communication apparatus which concerns on 1st Embodiment. It is a block diagram which shows the example of the schematic hardware composition of the communication apparatus which concerns on 1st Embodiment. It is a block diagram which shows the example of the schematic functional structure of the base station which concerns on 1st Embodiment. It is a block diagram which shows the example of the schematic hardware composition of the base station which concerns on 1st Embodiment. It is explanatory drawing which shows the example of the antenna arranged in the vehicle which concerns on 1st Embodiment. It is explanatory drawing for demonstrating the example of the position of an antenna and the predicted channel state information in 1st Embodiment. It is explanatory drawing for demonstrating the example of the period shown by the timing information which concerns on 1st Embodiment. It is a sequence diagram for demonstrating an example of the schematic flow of the process for configuring a communication apparatus so that the timing information is transmitted in 1st Embodiment. It is explanatory drawing for demonstrating the example of the transmission of the set of the channel state information and the timing information in 1st Embodiment. It is explanatory drawing for demonstrating an example of scheduling based on timing information and channel state information in 1st Embodiment. It is explanatory drawing for demonstrating the specific example of the operation which concerns on 1st Embodiment. It is explanatory drawing which shows the example of the antenna which concerns on 1st modification of 1st Embodiment. It is explanatory drawing which shows the example of the antenna which concerns on the 2nd modification of 1st Embodiment. It is explanatory drawing for demonstrating the example of the prediction which concerns on the 2nd modification of 1st Embodiment. It is explanatory drawing for demonstrating the specific example of the operation which concerns on the 6th modification of 1st Embodiment. It is explanatory drawing for demonstrating the specific example of the operation which concerns on 7th modification of 1st Embodiment. It is a sequence diagram for demonstrating the 1st example of the transmission of the timing information which concerns on 8th modification of 1st Embodiment. It is a sequence diagram for demonstrating the 2nd example of the transmission of the timing information which concerns on the 8th modification of 1st Embodiment. It is explanatory drawing for demonstrating the example of the minimum period which concerns on the 9th modification of 1st Embodiment. It is explanatory drawing for demonstrating the example of the maximum period which concerns on the 9th modification of 1st Embodiment. It is a sequence diagram for demonstrating the example of the transmission of the period information which concerns on the 9th modification of 1st Embodiment. It is a block diagram which shows the example of the schematic functional structure of the communication apparatus which concerns on 2nd Embodiment. It is a block diagram which shows the example of the schematic functional structure of the base station which concerns on 2nd Embodiment. It is explanatory drawing for demonstrating the example of the period shown by the timing information which concerns on 2nd Embodiment. It is a sequence diagram for demonstrating an example of the schematic flow of the process for configuring a communication apparatus so that the timing information is transmitted in the 2nd Embodiment. It is explanatory drawing for demonstrating an example of transmission of an uplink reference signal and timing information in 2nd Embodiment. It is explanatory drawing for demonstrating an example of scheduling based on timing information in 2nd Embodiment. It is explanatory drawing for demonstrating the specific example of the operation which concerns on 2nd Embodiment. It is a sequence diagram for demonstrating the 1st example of the transmission of the timing information which concerns on the 6th modification of the 2nd Embodiment. It is a sequence diagram for demonstrating the 2nd example of the transmission of the timing information which concerns on the 6th modification of the 2nd Embodiment. It is explanatory drawing for demonstrating the example of the minimum period which concerns on the 7th modification of 2nd Embodiment. It is explanatory drawing for demonstrating the example of the maximum period which concerns on the 7th modification of 2nd Embodiment.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, the same reference numerals may be given to elements that can be similarly described, so that duplicate description may be omitted.

The explanations are given in the following order.
1. 1. Communication system configuration 2. First Embodiment 2.1. Configuration of communication device 2.2. Base station configuration 2.3. Operation example 2.4. Modification example 3. Second embodiment 3.1. Configuration of communication device 3.2. Base station configuration 3.3. Operation example 3.4. Modification example 4. Modification example

<< 1. Communication system configuration >>
An example of the configuration of the communication system 1 according to the embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 1, communication system 1 includes a communication device 100 and a base station 200. In the communication system 1, communication is performed using, for example, the mobile communication technique (for example, 5G) described in the TS of 3GPP.

(1) Communication device 100
The communication device 100 communicates with the base station 200. For example, the communication device 100 is a UE in a 3GPP TS.

The communication device 100 is included in, for example, the vehicle 10, and the vehicle 10 communicates with the base station 200 by using the communication device 100. For example, the communication device 100 is an in-vehicle device that can be mounted on the vehicle 10. More specifically, for example, the communication device 100 is a V2X ECU (Electronic Control Unit).

The vehicle 10 is, for example, a four-wheeled vehicle (for example, a passenger car, a truck, a bus, etc.). Alternatively, the vehicle 10 may be a two-wheeled vehicle (eg, Motorcycle or Powered Two Wheels, etc.) or a tricycle. Alternatively, the vehicle 10 may be a railroad vehicle.

(2) Base station 200
The base station 200 is a node of a radio access network (RAN) and communicates with a communication device (for example, a UE) located in the coverage area of the base station 200. For example, the base station 200 communicates with the communication device 100 of the vehicle 10 when the vehicle 10 is in the coverage area.

For example, the base station 200 is a 5G base station, gNB (next generation Node B). The base station 200 may be an RSU (Road Side Unit).

<< 2. First Embodiment >>
Subsequently, the first embodiment of the present disclosure will be described with reference to FIGS. 2 to 22.

<2.1. Communication device configuration>
An example of the configuration of the communication device 100 according to the first embodiment of the present disclosure will be described with reference to FIGS. 2 and 3.

(1) Configuration of Functional Configuration First, with reference to FIG. 2, an example of the functional configuration of the communication device 100 according to the first embodiment of the present disclosure will be described. Referring to FIG. 2, the communication device 100 includes a wireless communication unit 110, an in-vehicle network communication unit 120, a storage unit 130, and a processing unit 140.

-Wireless communication unit 110
The wireless communication unit 110 wirelessly transmits and receives signals. For example, the wireless communication unit 110 receives a signal from another device and transmits a signal to the other device. For example, the other device is base station 200. Alternatively, the other device may be another communication device included in another vehicle.

-In-vehicle network communication unit 120
The in-vehicle network communication unit 120 receives a signal from the network in the vehicle 10 and transmits the signal to the network. For example, the above network is an in-vehicle LAN (Local Area Network). For example, in addition to the communication device 100, various sensors (for example, running state sensors, etc.), various ECUs (for example, engine control ECU, driving support ECU, etc.), operation switches, display devices, and the like are connected to the network. ing.

-Memory unit 130
The storage unit 130 temporarily or permanently stores programs and parameters for the operation of the communication device 100, as well as various data. The program includes one or more instructions for the operation of the communication device 100.

-Processing unit 140
The processing unit 140 provides various functions of the communication device 100. The processing unit 140 includes a generation unit 141 and a communication processing unit 143. The processing unit 140 may further include other components other than these components. That is, the processing unit 140 may perform operations other than the operations of these components. The specific operations of the generation unit 141 and the communication processing unit 143 will be described in detail later.

For example, the processing unit 140 (specifically, the communication processing unit 143) communicates with another device (for example, the base station 200) via the wireless communication unit 110. For example, the processing unit 140 communicates with a device connected to the network in the vehicle 10 via the in-vehicle network communication unit 120.

(2) Hardware Configuration Next, with reference to FIG. 3, an example of the hardware configuration of the communication device 100 according to the first embodiment of the present disclosure will be described. Referring to FIG. 3, the communication device 100 includes an RF (Radio Frequency) circuit 181, a baseband processor 183, an application processor 185, a memory 187, and an in-vehicle network interface 189.

For example, the baseband processor 183 processes the protocol layer of the RAN and communicates with another device (for example, the base station 200) via the antenna installed in the vehicle 10 and the RF circuit 181. For example, the protocol layer includes a physical layer, a MAC (Medium Access Control) layer, an RLC (Radio Link Control) layer, a PDCP (Packet Data Convergence Protocol) layer, a SDAP (Service Data Adaptation Protocol) layer, and an RRC (Radio Resource Control) layer. Includes layers.

For example, the baseband processor 183 includes a memory, which stores a program executed by the baseband processor 183, parameters related to the program, and various data. The above program may be called instructions.

For example, the application processor 185 processes a protocol layer higher than the protocol layer of the RAN, and communicates with other devices via the antenna, the RF circuit 181 and the baseband processor 183. For example, the upper protocol layer includes an internet layer, a transport layer, and an application layer.

The memory 187 stores a program executed by the application processor 185, parameters related to the program, and various data. The memory 187 may be contained in the application processor 185. The above program may be called an instruction.

The in-vehicle network interface 189 is, for example, a LAN adapter. The application processor 185 communicates with the device connected to the in-vehicle LAN via the in-vehicle network interface 189.

The wireless communication unit 110 may be implemented by the RF circuit 181. The in-vehicle network communication unit 120 may be implemented by the in-vehicle network interface 189. The storage unit 130 may be implemented by the memory and the memory 187 included in the baseband processor 183. The processing unit 140 may be implemented by the baseband processor 183 and the application processor 185. The generation unit 141 included in the processing unit 140 and the communication processing unit 143 may be implemented by, for example, the baseband processor 183.

Considering the above hardware configuration, for example, the communication device 100 includes a memory for storing a program and one or more processors for executing the program to operate the generation unit 141 and the communication processing unit 143. For example, the memory is a memory included in the baseband processor 183, and the one or more processors is the baseband processor 183. It can be said that the above program is a program that causes a computer to execute the operations of the generation unit 141 and the communication processing unit 143.

<2.2. Base station configuration>
An example of the configuration of the base station 200 according to the first embodiment of the present disclosure will be described with reference to FIGS. 4 and 5.

(1) Configuration of Functional Configuration First, an example of the functional configuration of the base station 200 according to the first embodiment of the present disclosure will be described with reference to FIG. Referring to FIG. 4, the base station 200 includes a wireless communication unit 210, a network communication unit 220, a storage unit 230, and a processing unit 240.

-Wireless communication unit 210
The wireless communication unit 210 wirelessly transmits and receives signals. For example, the wireless communication unit 210 receives a signal from another device and transmits a signal to the other device. For example, the other device is a communication device 100.

-Network communication unit 220
The network communication unit 220 receives a signal from the network and transmits the signal to the network. For example, the network is a backhaul.

-Memory unit 230
The storage unit 230 temporarily or permanently stores programs and parameters for the operation of the base station 200, as well as various data. The program includes one or more instructions for the operation of base station 200.

-Processing unit 240
The processing unit 240 provides various functions of the base station 200. The processing unit 240 includes a transmission processing unit 241 and a reception processing unit 243 and a control unit 245. The processing unit 240 may further include other components other than these components. That is, the processing unit 240 may perform operations other than the operations of these components. The specific operations of the transmission processing unit 241 and the reception processing unit 243 and the control unit 245 will be described in detail later.

For example, the processing unit 140 (specifically, the transmission processing unit 241 and the reception processing unit 243) communicates with another device (for example, the communication device 100) via the wireless communication unit 210. For example, the processing unit 240 communicates with another node (for example, a core network node or another base station) via the network communication unit 220.

(2) Hardware Configuration Next, with reference to FIG. 5, an example of the hardware configuration of the base station 200 according to the first embodiment of the present disclosure will be described. Referring to FIG. 5, the base station 200 includes an antenna 281, an RF circuit 283, a processor 285, a network interface 287, and a memory 289.

For example, the processor 285 processes the protocol layer of the RAN and communicates with another device (eg, the communication device 100) via the antenna 281 and the RF circuit 283. For example, the protocol layer includes a physical layer, a MAC layer, an RLC layer, a PDCP layer, a SDAP layer, and an RRC layer.

For example, the processor 285 performs processing for communication with another node (for example, a core network node or another base station) via the network, and communicates with the other node via the network interface 287. The network interface 287 is, for example, a network adapter.

The memory 289 stores a program executed by the processor 285, parameters related to the program, and various data. The memory 289 may be contained in the processor 285. The above program may be called an instruction.

Of course, the base station 200 may include a plurality of antennas 281, a plurality of RF circuits 283, a plurality of processors 285, a plurality of network interfaces 287 or a plurality of memories 289.

The base station 200 may include a RU (Radio Unit), a DU (Distributed Unit) and a CU (Centralized Unit). In this case, the antenna 281 and the RF circuit 283 may be included in the RU, the processor 285 and the memory 289 may be included in each of the RU, DU and CU, and the network interface 287 may be included in the CU. It may be.

The wireless communication unit 210 may be implemented by an antenna 281 and an RF circuit 283. The network communication unit 220 may be implemented by the network interface 287. The storage unit 230 may be mounted by the memory 289. The processing unit 240 may be implemented by the processor 285. The transmission processing unit 241 and the reception processing unit 243 and the control unit 245 included in the processing unit 240 may be implemented by, for example, the processor 285.

Considering the above hardware configuration, for example, the base station 200 has a memory for storing a program and one or more that executes the program to operate the transmission processing unit 241 and the reception processing unit 243 and the control unit 245. Equipped with a processor. For example, the memory is memory 289, and the one or more processors is processor 285. It can be said that the above program is a program that causes a computer to execute the operations of the transmission processing unit 241 and the reception processing unit 243 and the control unit 245.

A part of the base station 200 (for example, at least one of DU and CU) may be virtualized. That is, a part of the base station 200 may be implemented as a virtual machine. In this case, a part (virtual machine) of the base station 200 may operate as a virtual machine on a physical machine (hardware) including a processor, a memory, and the like and a hypervisor.

<2.3. Operation example>
An example of the operation of the communication device 100 and the base station 200 according to the first embodiment of the present disclosure will be described with reference to FIGS. 6 to 12.

In the first embodiment, the base station 200 (transmission processing unit 241) transmits a downlink reference signal. The communication device 100 (generation unit 141) generates channel state information (CSI) by measurement based on the downlink reference signal.

In particular, in the first embodiment, the communication device 100 (communication processing unit 143) transmits the timing information regarding the timing at which the channel state information (CSI) becomes valid and the channel state information by uplink. The base station 200 (reception processing unit 243) receives the timing information and the channel state information from the communication device 100.

This allows, for example, the base station 200 to utilize valid channel state information.

(1) Downlink reference signal For example, the downlink reference signal is a channel state information reference signal (CSI-RS).

(2) Channel state information-prediction information For example, the channel state information is channel state information predicted for the timing. That is, the communication device 100 (generation unit 141) generates channel state information predicted for the timing.

Specifically, for example, the communication device 100 (generation unit 141) generates the channel state information by measurement based on the downlink reference signal received through the first antenna, and the communication device 100 (communication processing unit). 143) communicates through the second antenna. For example, the first antenna is an antenna arranged in front of the second antenna in the vehicle 10.

For example, referring to FIG. 6, the antenna 11 and the antenna 13 are arranged in the vehicle 10. In particular, the antenna 11 is arranged in front of the antenna 13 in the vehicle 10. In other words, the antenna 11 is arranged in the traveling direction of the vehicle 10 with respect to the antenna 13. Therefore, as shown in FIG. 7, the position of the antenna 11 becomes the future position of the antenna 13 while the vehicle 10 is moving forward. The communication device 100 (generation unit 141) generates channel state information by measurement based on the downlink reference signal received through the antenna 11, and the communication device 100 (communication processing unit 143) communicates with the base station 200 through the antenna 13. connect. Therefore, the channel state information is the channel state information predicted for the future time when the antenna 13 will reach the position of the antenna 11 at the time of receiving the downlink reference signal. In other words, the channel state information is channel state information that becomes valid at the timing when the antenna 13 reaches the position of the antenna 11 at the time of receiving the downlink reference signal. The period required for the antenna 13 to reach the position of the antenna 11 is calculated by [distance between the antenna 11 and the antenna 13] ÷ [speed of the vehicle 10]. The antenna 11 and the antenna 13 may be antenna elements.

This allows, for example, to generate channel state information about future times. Therefore, the base station 200 can use the valid channel state information.

-Specific content For example, the above channel state information includes CQI, rank indicator (RI), Precoding Matrix Indicator (PMI), SS (Synchronization Signals) / PBCH (Physical Broadcast Channel) block resource. At least one of the indicator (SS / PBCH Block Resource Indicator: SSBRI), CSI-RS resource indicator (CSI-RS Resource Indicator: CRI), layer indicator (LI) and L1-RSRP (Reference Signal Resource Power). Including one. The channel state information may be one of CQI, RI, PMI, SSBRI, CRI, LI and L1-RSRP.

(3) Timing information For example, the timing information indicates the timing at which the channel state information becomes valid. For example, the timing information indirectly indicates the timing.

Specifically, for example, the timing information indicates a period between the timing at which the channel state information becomes valid and another timing related to the channel state information.

For example, the other timing is the timing at which the channel state information is transmitted on the uplink. That is, the timing information indicates a period between the timing at which the channel state information becomes valid and the timing at which the channel state information is transmitted on the uplink.

For example, referring to the example of FIG. 8, at the timing 21, the base station 200 transmits a downlink reference signal (DL RS), and the communication device 100 receives the DL RS. The communication device 100 generates the CSI by the measurement based on the DL RS, and transmits the CSI at the timing 23. The CSI becomes effective at timing 25. For example, referring to the example of FIG. 7 again, at the timing 21, the DL RS is received through the antenna 11, and at the timing 25, the antenna 13 reaches the position of the antenna 11 at the timing 21. Therefore, the CSI generated by the measurement based on the DL RS becomes effective at the timing 25. In such an example, the timing information indicates a period 27 between timing 25 and timing 23. The period 27 is calculated as follows, for example.
[Period 29] = [Distance between antenna 11 and antenna 13] ÷ [Velocity of vehicle 10]
[Timing 25] = [Timing 21] + [Period 29]
[Period 27] = [Timing 25]-[Timing 23]

This makes it possible to suppress the amount of the timing information, for example.

The timing information indicates the period by, for example, a wireless frame, a subframe, a slot, or a symbol. Alternatively, the timing information may indicate the period by a combination of two or more of a radio frame, a subframe, a slot, and a symbol. This facilitates, for example, timing identification in the RAN.

(4) Transmission of channel state information and timing information-Transmission of timing information according to configuration information For example, the base station 200 (transmission processing unit 241) includes configuration information for transmission of the timing information. The RRC message is transmitted to the communication device 100. The configuration information can also be said to be information constituting the communication device 100 so as to transmit the timing information.

For example, when the communication device 100 (communication processing unit 143) receives the RRC message including the configuration information, the communication device 100 generates channel state information predicted for the timing according to the configuration information, and the channel state information and the channel state information and the channel state information are generated. The above timing information is transmitted by uplink. On the other hand, when the communication device 100 (communication processing unit 143) does not receive the RRC message including the configuration information, it generates normal channel state information without prediction and does not transmit the timing information by uplink. .. In this case, the base station 200 may identify the timing of receiving the normal channel state information as the timing at which the normal channel state information becomes valid.

Referring to FIG. 9, the base station 200 (transmission processing unit 241) transmits an RRC message including configuration information for transmitting the timing information to the communication device 100, and the communication device 100 (communication processing unit 143) transmits the RRC message to the communication device 100. Receive the RRC message (S301). The communication device 100 (communication processing unit 143) transmits a response message to the RRC message to the base station 200 (S303). For example, the configuration information is included in the CSI-reportConfig in the RRC message. For example, the RRC message is an RRCReconification message, and the response message is an RRCReconnectionComplete message.

This makes it possible to flexibly control the transmission of the timing information, for example. In other words, this makes it possible to flexibly control, for example, the type of channel state information.

-Method of transmitting channel state information and timing information For example, the communication device 100 (communication processing unit 143) sets a set of the channel state information and the timing information in PUCCH (Physical Uplink Control Channel) or PUSCH (Physical Uplink Shared). Channel) to send.

For example, referring to FIG. 10, at the timing 21, the base station 200 transmits the DL RS, and the communication device 100 receives the DL RS. The communication device 100 generates a CSI by measurement based on the DL RS, and transmits a set of CSI and timing information at the timing 23. The CSI is enabled at timing 25 and the timing information indicates a period 27 between timing 25 and timing 23.

This makes it possible to easily notify the base station 200 of, for example, the correspondence between the channel state information and the timing information.

-Trigger for transmission of timing information For example, the communication device 100 (communication processing unit 143) sets a set of channel state information and timing information regarding the timing at which the channel state information becomes valid for each transmission of channel state information. Send by uplink.

This makes it possible, for example, to notify the base station 200 in detail when the channel state information becomes effective for each transmission of the channel state information.

(5) Scheduling based on channel state information For example, the base station 200 (control unit 245) performs scheduling for the communication device 100 based on the timing information and the channel state information. For example, the scheduling includes resource allocation and link adaptation for the communication device 100. For example, the scheduling is downlink scheduling, and the resource allocation is downlink radio resource allocation. The link conformance is the selection of the Modulation Coding Scheme (MCS).

Referring to FIG. 11, the base station 200 (control unit 245) receives the CSI and timing information transmitted by the communication device 100 at the timing 23, and from the timing 23 and the period 27 indicated by the timing information, The timing 25 at which the above CSI becomes effective is identified. Then, the base station 200 (control unit 245) performs downlink scheduling (for example, resource allocation) for the slots near the timing 25 based on the CSI. For example, the slot offset (that is, the offset between the DCI slot and the radio resource slot) is 0, and the base station 200 (control unit 245) transmits DCI and data to the communication device 100 in the slot.

For example, the base station 200 (control unit 245) selects the CSI to be used for each slot. For example, if there is a CSI that is valid in the slot, the base station 200 (control unit 245) performs scheduling for the communication device 100 in the slot based on the CSI. On the other hand, when there is no valid CSI in the slot, the base station 200 (control unit 245) schedules for the communication device 100 in the slot based on the CSI that becomes valid at the timing closest to the slot. conduct. Alternatively, the base station 200 (control unit 245) is based on a first CSI that takes effect at the nearest timing before the slot and a second CSI that takes effect at the closest timing after the slot. , Scheduling for the communication device 100 in the slot may be performed.

This allows, for example, to efficiently use radio resources based on valid channel state information.

(6) Specific Example A specific example of the operation will be described with reference to FIG.

The communication device 100 receives the DL RS ₁ transmitted by the base station 200 in the slot 1 through the antenna 11. The communication device 100 generates CSI ₁ by measurement based on DL RS ₁ , and transmits CSI ₁ and timing information to the base station 200 in slot 2. The timing information indicates the period ΔT ₁ . Since the timing at which the antenna 13 reaches the position of the antenna 11 in the slot 1 is the slot 4, ΔT ₁ is 2 slots (= slot 4-slot 2).

Further, the communication device 100 receives the DL RS ₂ transmitted by the base station 200 in the slot 2 through the antenna 11. The communication device 100 generates the CSI ₂ by the measurement based on the DL RS ₂ , and transmits the CSI ₂ and the timing information to the base station 200 in the slot 3. The timing information indicates the period ΔT ₂ . Since the timing at which the antenna 13 reaches the position of the antenna 11 in the slot 2 is the slot 6, ΔT ₂ is 3 slots (= slot 6-slot 3).

The timing at which CSI ₁ becomes effective is slot 4 (= slot 2 + ΔT ₁ ), and the timing at which CSI ₂ becomes effective is slot 6 (= slot 3 + ΔT ₂ ). Therefore, the base station 200 schedules the slot 4 based on the CSI ₁ and schedules the slot 6 based on the CSI ₂ . For example, the base station 200 allocates the radio resources of the slot 4 to the communication device 100 based on the CSI ₁ , and transmits DCI and data to the communication device 100 in the slot 4. For example, the base station 200 allocates the radio resources of the slot 6 to the communication device 100 based on the CSI ₂ , and transmits DCI and data to the communication device 100 in the slot 6.

For slot 5, the base station 200 may allocate the radio resources of slot 5 to the communication device 100 based on one of CSI ₁ and CSI ₂ . Alternatively, the base station 200 may allocate the radio resources in slot 5 to the communication device 100 based on both CSI ₁ and CSI ₂ .

In the example of FIG. 12, the communication device 100 (communication processing unit 143) may receive data in one of the slot 4 and the slot 6 instead of receiving the data in both the slot 4 and the slot 6. For example, when the CQI ₂ in the CSI ₂ is higher than the CQI ₁ in the CSI ₁ , the base station 200 (control unit 145) does not allocate the radio resource in the slot 4 to the communication device 100, and the radio in the slot 6 Resources may be allocated to the communication device 100. As a result, the communication device 100 (communication processing unit 143) may not receive the data in the slot 4 but may receive the data in the slot 6.

<2.4. Modification example>
A modification of the first embodiment of the present disclosure will be described with reference to FIGS. 13 to 22. As a matter of course, two or more of the modifications described below may be combined.

(1) First Modification Example: Antenna In the above-mentioned specific example of the first embodiment, the antenna 11 and the antenna 13 are arranged in the vehicle 10. However, the antenna according to the first embodiment is, of course, not limited to this example.

In the first modification of the first embodiment, the vehicle 10 may have three or more antennas arranged along the traveling direction of the vehicle 10. For example, as shown in FIG. 13, twelve antennas 15 (antennas 15A to 15L) may be arranged in the vehicle 10 along the traveling direction of the vehicle 10. For example, the communication device 100 (generation unit 141) may generate channel state information by measurement based on the downlink reference signal received through the antenna 15A. Further, the communication device 100 (communication processing unit 153) may communicate with the base station 200 through one of the antennas 15B to 15L. The communication device 100 (communication processing unit 153) may selectively use one of the antennas 15B to 15L.

As an example, the optimum antenna among the antennas 15B to 15L may be selected for each slot based on the measurement result based on the reference signal received through the antenna 15A. The optimum antenna may be the antenna with the best channel quality. Since the timing at which CSI becomes effective depends on the antenna selected, the timing information may be generated based on the antenna selected.

In addition, each antenna 15 may be an antenna element.

(2) Second Modification Example: Channel State Information In the above-described specific example of the first embodiment, the antenna 11 and the antenna 13 are arranged in the vehicle 10, and the antenna 11 is used to generate the channel state information. 13 is used for communication with the base station 200. As a result, the channel state information becomes the predicted channel state information for the antenna 13. However, the channel state information according to the first embodiment is, of course, not limited to this example.

In the second modification of the first embodiment, the communication device 100 (generation unit 141) generates the channel state information by the measurement based on the downlink reference signal and the prediction processing using the measurement result. You may.

For example, as shown in FIG. 14, the antenna 17 may be arranged in the vehicle 10. The communication device 100 (generation unit 141) may generate channel state information by a measurement based on a downlink reference signal received through the antenna 17 and a prediction process using the result of the measurement. Further, the communication device 100 (communication processing unit 143) may communicate with the base station 200 through the antenna 17.

A specific example of the operation will be described with reference to FIG. The communication device 100 (generation unit 141) predicts the future slots, slot 5, slot 6 and slot 7, by predictive processing using a series of measurement results (for example, a series of CQIs) up to slot 3. (CQI ₅ , CQI ₆ and CQI ₇ ) may be generated.

As an example, the prediction process is a prediction process based on the least squares method. For example, the communication device 100 (generation unit 141) obtains a CQI function by the least squares method using a series of measurement results (for example, a series of CQIs) as an input, and generates the CQI predicted by the function.

As another example, the prediction process may be a prediction process based on opportunity learning. For example, the communication device 100 (generation unit 141) uses a model obtained by pre-learning based on a large number of measurement results (for example, a large number of CQIs) to obtain the latest series of measurement results (for example, the latest series of CQIs). ) May generate the predicted CQI.

This makes it possible, for example, to utilize valid channel state information without using different antennas for measurement and communication.

As a matter of course, the prediction processing according to the second modification is not limited to the above-mentioned example (prediction processing based on the least squares method or prediction processing of machine learning). For example, any of the prediction processes described in Non-Patent Document 2 described above may be used.

(3) Third Modification Example: Channel State Information In the above-described specific example of the first embodiment, the channel state information is generated by measurement based on the downlink reference signal in one slot. Further, in the above-described specific example of the first embodiment, the timing information indicates a specific slot as the timing at which the channel state information becomes effective. However, the channel state information and timing information according to the first embodiment are, of course, not limited to this example.

In a third modification of the first embodiment, the channel state information may be generated by measurements based on downlink reference signals transmitted within the plurality of slots.

The timing indicated by the timing information may be a period spanning a plurality of slots.

The timing indicated by the timing information may be a time point indicated by the timing information or a time period indicated by the timing information. Specifically, the timing indicated by the timing information may be one or more symbols, one or more slots, one or more subframes, or one or more radio frames.

(4) Fourth Modification Example: Timing Information In the above-mentioned specific example of the first embodiment, the timing information is transmitted by uplink between the timing at which the channel state information becomes valid and the channel state information. Indicates the period between the timing and the timing. Referring again to FIG. 8, the timing information indicates a period 27 between the timing 25 when the CSI becomes valid and the timing 23 when the CSI is transmitted. However, the timing information according to the first embodiment is, of course, not limited to this example.

In the fourth modification of the first embodiment, the timing information may indicate another period (that is, a period other than the period 27 in FIG. 8). Referring again to FIG. 8, the timing information may indicate a period between timing 25 and timing other than timing 23. For example, the timing information may indicate a period 29 between timing 25 and timing 21. In this case, the communication device 100 (communication processing unit 143) may notify the base station 200 of the timing 21 when the DL RS is received, together with the CSI and the timing information. Alternatively, the base station 200 may be able to recognize the timing 21 as the timing corresponding to the CSI.

This allows, for example, the communication device 100 to generate timing information regardless of the timing of transmission of channel state information.

(5) Fifth Modification Example: Timing Information In the above-described specific example of the first embodiment, the timing information includes the timing at which the channel state information becomes valid and other timings related to the channel state information. Indicates the period between and. However, the timing information according to the first embodiment is, of course, not limited to this example.

In the fifth modification of the first embodiment, the timing information may directly indicate the timing at which the channel state information becomes effective. Referring again to FIG. 8, the timing information may indicate the timing 25 itself.

As a result, for example, the communication device 100 can generate timing information regardless of the timing of transmission of the channel state information, and the base station 200 can set the timing at which the channel state information becomes valid only for the timing information. It becomes possible to identify from.

For example, the timing information may indicate the timing at which the channel state information becomes valid (for example, timing 25 in FIG. 8) by means of a system frame number, a subframe number, a slot number, and a symbol number. Alternatively, the timing information may indicate the timing (for example, timing 25 in FIG. 8) by a combination of two or more of the system frame number, the subframe number, the slot number, and the symbol number. This facilitates, for example, timing identification in the RAN.

(6) Sixth modification: Method of transmitting channel state information and timing information In the sixth modification of the first embodiment, the communication device 100 (communication processing unit 143) is described above in one slot. A plurality of different sets of channel state information and the timing information may be transmitted.

A specific example of the operation will be described with reference to FIG. The communication device 100 (generation unit 141) generates CSI ₁ by the measurement based on DL RS ₁ transmitted in slot 1, CSI ₂ is generated by the measurement based on DL RS ₂ transmitted in slot 2, and slot 3 is generated. Generate CSI ₃ by measurement based on DL RS ₃ transmitted in. In slot 4, the communication device 100 (generation unit 141) has a set of CSI ₁ and timing information (ΔT ₁ ), a set of CSI ₂ and timing information (ΔT ₂ ), and CSI ₃ and timing information (ΔT ₃ ). ) And the set are transmitted to the base station 200.

This makes it possible to transmit necessary information in a limited number of slots, for example, without securing resources for each slot.

The communication device 100 (communication processing unit 143) may transmit a larger number of sets of the channel state information and the timing information in the PUSCH than in the PUCCH. This makes it possible, for example, to save radio resources on the control channel and effectively utilize the radio resources on the data channel.

(7) Seventh modification: Method for transmitting channel state information and timing information In the seventh modification of the first embodiment, the communication device 100 (generation unit 141) is transmitted at a plurality of timings. A plurality of channel state information corresponding to each of the plurality of timings may be generated by the measurement based on the link reference signal. Further, the communication device 100 (communication processing unit 143) is timing information regarding the timing at which each of the plurality of channel state information becomes valid, and is the same timing information common to the plurality of channel state information and the plurality of described timing information. Channel state information of may be transmitted by uplink.

For example, the traveling direction and speed of the vehicle 10 may be constant at the plurality of timings. Therefore, among the plurality of channel state information, the period between the timing when the channel state information becomes valid and the timing when the channel state information is transmitted by the uplink may be the same. As a result, the timing information indicating the period may be common among the plurality of channel state information.

-First Example of Transmission Method As a first example, the communication device 100 (communication processing unit 143) transmits the timing information together with the first channel state information among the plurality of channel state information by uplink. You may. After that, the communication device 100 (communication processing unit 143) may transmit other channel state information among the plurality of channel state information by uplink.

A specific example of the operation will be described with reference to FIG. The communication device 100 (generation unit 141) generates CSI ₁ by the measurement based on DL RS ₁ transmitted in slot 1, CSI ₂ is generated by the measurement based on DL RS ₂ transmitted in slot 2, and slot 3 is generated. Generate CSI ₃ by measurement based on DL RS ₃ transmitted in. The communication device 100 (generation unit 141) transmits timing information (ΔT) common to CSI ₁ , CSI ₂ and CSI ₃ to the base station 200 in slot 2 together with CSI ₁ . In this example, ΔT is 3 slots. The communication device 100 (generation unit 141) transmits the CSI ₂ to the base station 200 in the slot 3 and transmits the CSI ₃ to the base station 200 in the slot 4.

This makes it possible to reduce the overhead, for example, when the timing information is common.

-Second Example of Transmission Method As a second example, the communication device 100 (communication processing unit 143) transmits a MAC control element including the timing information or an RRC message including the timing information by uplink. You may.

This makes it possible, for example, to reduce the signaling overhead of the physical layer.

In addition, in order to supplement the time lag due to MAC signaling or RRC signaling, default timing information may be defined in advance. The base station 200 (control unit 245) may appropriately use the default timing information.

(8) Eighth Modification Example: Trigger for Transmission of Timing Information In the above-described specific example of the first embodiment, the communication device 100 (communication processing unit 143) receives channel state information for each transmission of channel state information. , A set with timing information regarding the timing at which the channel state information becomes valid is transmitted by uplink. However, the transmission of timing information according to the first embodiment is, of course, not limited to this example.

-First Example: Transmission According to Request In the eighth modification of the first embodiment, the base station 200 (transmission processing unit 241) is a downlink control including request information for requesting transmission of the timing information. Information (DCI) may be transmitted to the communication device 100. The communication device 100 (communication processing unit 143) may transmit the timing information by uplink in response to the reception of the DCI including the request information. The request information may be a CSI request set to a value requesting transmission of the timing information.

Referring to the example of FIG. 18, the base station 200 (transmission processing unit 241) transmits the DCI including the CSI request set to the value requesting the transmission of the timing information to the communication device 100 (S311). The base station 200 (transmission processing unit 241) also transmits DL RS (S313). In response to the CSI request, the communication device 100 (communication processing unit 143) transmits the CSI generated by the measurement based on the DL RS and the timing information regarding the timing at which the CSI becomes effective to the base station 200. (S315). In response to the CSI request, the communication device 100 may transmit timing information common to a plurality of CSIs without transmitting the CSI.

This makes it possible to flexibly control the transmission of the timing information, for example. Further, this makes it possible to flexibly control the type of channel state information, for example.

-Second Example: Periodic Transmission In the eighth modification of the first embodiment, the communication device 100 (communication processing unit 143) may periodically transmit the timing information by uplink.

Referring to the example of FIG. 19, the communication device 100 (communication processing unit 143) periodically obtains CSI generated by measurement based on DL RS and timing information regarding the timing at which the CSI becomes effective as a base station. It is transmitted to 200 (S321, S323, S325). The communication device 100 (communication processing unit 143) may transmit timing information common to a plurality of CSIs without transmitting the CSI.

This makes it possible, for example, to transmit the timing information without using DCI.

(9) Ninth Modification Example: Timing Restriction In the above-mentioned specific example of the first embodiment, there is no particular restriction on the timing at which the channel state information becomes valid. However, the first embodiment is, of course, not limited to this example.

-First Example: Minimum Period In the ninth modification of the first embodiment, the timing at which the channel state information becomes valid is a predetermined minimum timing than the timing at which the channel state information is transmitted via the uplink. It may be later than the period.

Referring to the example of FIG. 20, the timing 25 at which the CSI becomes effective is later than the timing 23 at which the CSI is transmitted on the uplink by a minimum period of 31 or more. In other words, the period 27 indicated by the timing information is longer than the minimum period 31.

This allows, for example, the base station 200 to secure sufficient time for scheduling.

The base station 200 (transmission processing unit 241) has a minimum between the timing at which the channel state information becomes valid (for example, timing 25) and the timing at which the channel state information is transmitted on the uplink (for example, timing 23). Period information indicating the period (for example, the minimum period 31) may be transmitted by a downlink. The communication device 100 (communication processing unit 143) may receive the period information indicating the minimum period by downlink.

This allows, for example, the base station 200 to secure sufficient time for scheduling under its own control.

-Second example: Maximum period In the ninth modification of the first embodiment, the timing at which the channel state information becomes valid is a predetermined maximum period from the timing at which the channel state information is transmitted by the uplink. It may be within.

Referring to the example of FIG. 21, the timing 25 at which the CSI becomes effective is within a maximum period 33 from the timing 23 at which the CSI is transmitted on the uplink. In other words, the period 27 indicated by the timing information is shorter than the maximum period 33.

This makes it possible to avoid the use of channel state information whose accuracy has deteriorated due to channel fluctuations over a long period of time, for example.

The maximum period may be a period according to the frequency band in which the downlink reference signal is transmitted. For example, the higher the frequency of the frequency band, the shorter the maximum period may be, as the channel is more volatile in the higher frequency band. In other words, the lower the frequency in the frequency band, the longer the maximum period may be. This makes it possible to make predictions suitable for frequencies, for example.

The base station 200 (transmission processing unit 241) has a maximum between the timing at which the channel state information becomes valid (for example, timing 25) and the timing at which the channel state information is transmitted on the uplink (for example, timing 23). Period information indicating the period (for example, the maximum period 33) may be transmitted by a downlink. The communication device 100 (communication processing unit 143) may receive the period information indicating the maximum period by downlink.

This makes it possible to avoid the use of channel state information whose accuracy has deteriorated, for example, due to the control performed by the base station 200.

-Third Example: Minimum Period + Maximum Period In the ninth modification of the first embodiment, the above two examples may be combined. That is, the timing at which the channel state information becomes valid may be later than the minimum period or more than the timing at which the channel state information is transmitted by the uplink, and may be within the maximum period from the timing. The period information may indicate both the minimum period and the minimum period.

-Transmission and reception of period information The base station 200 (transmission processing unit 241) may transmit an RRC message including the period information to the communication device 100, and the communication device 100 (communication processing unit 143) receives the RRC message. You may. In this case, the period information may be included in the CSI-reportConfig in the RRC message. This makes it possible, for example, to reduce the signaling overhead of the lower layer.

Alternatively, the base station 200 (transmission processing unit 241) may transmit the MAC control element including the period information by downlink, and the communication device 100 (communication processing unit 143) receives the MAC control element. May be good. Alternatively, the base station 200 (transmission processing unit 241) may transmit the downlink control information (DCI) including the period information in the downlink, and the communication device 100 (communication processing unit 143) receives the DCI. You may. This makes it possible, for example, to send and receive period information at a higher speed.

Referring to the example of FIG. 22, the base station 200 (transmission processing unit 241) transmits the period information by downlink, and the communication device 100 (communication processing unit 143) receives the period information (S331).

(10) Tenth Modification Example: Duration Information In the tenth modification of the first embodiment, the communication device 100 (communication processing unit 143) has duration information regarding the duration during which the channel state information is valid. May be sent by uplink. The base station 200 (reception processing unit 243) may receive the duration information from the communication device 100. For example, the duration information may be information indicating the duration.

For example, the communication device 100 (communication processing unit 143) may transmit the duration information together with the timing information by uplink.

Alternatively, the timing information may include the duration information. As an example, the timing information may include an information element regarding the timing at which the channel state information becomes effective and an information element regarding the duration at which the channel state information becomes effective (that is, duration information). As another example, the timing information may be an information element relating to both the timing and the duration at which the channel state information is valid (eg, an information element indicating both the timing and the duration).

This allows, for example, the base station 200 to utilize valid channel state information over a duration.

(11) Eleventh Modification Example: Accuracy Degradation Information In the eleventh modification of the first embodiment, the communication device 100 (communication processing unit 143) has the channel state according to the time gap with the timing. The information on the deterioration of the accuracy of the information may be transmitted by the uplink. The base station 200 (reception processing unit 243) may receive the accuracy reduction information from the communication device 100. For example, the accuracy reduction information may be information indicating the accuracy reduction according to the gap.

For example, the communication device 100 (communication processing unit 143) may transmit the accuracy reduction information together with the timing information by uplink.

Alternatively, the timing information may include the accuracy reduction information. As an example, the timing information is an information element relating to the timing at which the channel state information becomes valid and an information element relating to a decrease in the accuracy of the channel state information according to a time gap with the timing (that is, accuracy reduction information). ) And may be included. As another example, the timing information may be an information element relating to both the timing and the decrease in accuracy (for example, an information element indicating both the timing and the decrease in accuracy).

This makes it possible to avoid the use of channel state information with reduced accuracy, for example.

<< 3. Second embodiment >>
Subsequently, a second embodiment of the present disclosure will be described with reference to FIGS. 23 to 33.

<3.1. Communication device configuration>
An example of the configuration of the communication device 100 according to the second embodiment of the present disclosure will be described with reference to FIG. 23.

(1) Configuration of Functional Configuration First, with reference to FIG. 23, an example of the functional configuration of the communication device 100 according to the second embodiment of the present disclosure will be described. Referring to FIG. 23, the communication device 100 includes a wireless communication unit 110, an in-vehicle network communication unit 120, a storage unit 130, and a processing unit 150.

The description of the wireless communication unit 110, the in-vehicle network communication unit 120, and the storage unit 130 according to the second embodiment is the same as those in the first embodiment. Therefore, duplicate description is omitted here.

-Processing unit 150
The processing unit 150 provides various functions of the communication device 100. The processing unit 150 includes a generation unit 151 and a communication processing unit 153. The processing unit 150 may further include other components other than these components. That is, the processing unit 150 may perform operations other than the operations of these components. The specific operations of the generation unit 151 and the communication processing unit 153 will be described in detail later.

For example, the processing unit 150 (specifically, the communication processing unit 153) communicates with another device (for example, the base station 200) via the wireless communication unit 110. For example, the processing unit 150 communicates with a device connected to the network in the vehicle 10 via the in-vehicle network communication unit 120.

(2) Hardware Configuration The description of the hardware configuration of the communication device 100 according to the second embodiment is the same as the description of the hardware configuration of the communication device 100 according to the first embodiment, except for some reference numerals. be. Therefore, duplicate description is omitted here. In the description of the second embodiment, the processing unit 140, the generation unit 141, and the communication processing unit 143 in the description of the first embodiment are replaced with the processing unit 150, the generation unit 151, and the communication processing unit 153, respectively. ..

<3.2. Base station configuration>
An example of the configuration of the base station 200 according to the second embodiment of the present disclosure will be described with reference to FIG. 24.

(1) Configuration of Functional Configuration First, with reference to FIG. 24, an example of the functional configuration of the base station 200 according to the second embodiment of the present disclosure will be described. Referring to FIG. 24, the base station 200 includes a wireless communication unit 210, a network communication unit 220, a storage unit 230, and a processing unit 250.

The description of the wireless communication unit 210, the network communication unit 220, and the storage unit 230 according to the second embodiment is the same as those in the first embodiment. Therefore, duplicate description is omitted here.

-Processing unit 250
The processing unit 250 provides various functions of the base station 200. The processing unit 250 includes a transmission processing unit 251 and a reception processing unit 253 and a control unit 255. The processing unit 250 may further include other components other than these components. That is, the processing unit 250 may perform operations other than the operations of these components. The specific operations of the transmission processing unit 251 and the reception processing unit 253 and the control unit 255 will be described in detail later.

For example, the processing unit 250 (specifically, the transmission processing unit 251 and the reception processing unit 253) communicates with another device (for example, the communication device 100) via the wireless communication unit 210. For example, the processing unit 250 communicates with another node (for example, a core network node or another base station) via the network communication unit 220.

(2) Hardware Configuration The description of the hardware configuration of the base station 200 according to the second embodiment is the same as the description of the hardware configuration of the base station 200 according to the first embodiment, except for some reference numerals. be. Therefore, duplicate description is omitted here. In the description of the second embodiment, the processing unit 240, the transmission processing unit 241 and the reception processing unit 243 and the control unit 245 in the description of the first embodiment are the processing unit 250, the transmission processing unit 251 and the reception unit, respectively. It is replaced by the processing unit 253 and the control unit 255.

<3.3. Operation example>
An example of the operation of the communication device 100 and the base station 200 according to the second embodiment of the present disclosure will be described with reference to FIGS. 25 to 29.

In the second embodiment, the communication device 100 (generation unit 151) generates timing information regarding the timing at which the measurement result based on the uplink reference signal transmitted by the communication device 100 becomes valid. The communication device 100 (communication processing unit 153) transmits the timing information by uplink.

The base station 200 (reception processing unit 253) receives the uplink reference signal. The base station 200 (reception processing unit 253) receives the timing information from the communication device 100.

This allows, for example, base station 200 to utilize valid information about the state of the channel.

(1) Uplink reference signal The communication device 100 (communication processing unit 153) transmits the uplink reference signal. For example, the uplink reference signal is a sounding reference signal (SRS).

For example, the communication device 100 (communication processing unit 153) transmits the uplink reference signal through the first antenna and communicates through the second antenna. For example, the first antenna is an antenna arranged in front of the second antenna in the vehicle 10.

For example, referring again to FIG. 6, the antenna 11 and the antenna 13 are arranged in the vehicle 10. In particular, the antenna 11 is arranged in front of the antenna 13 in the vehicle 10. In other words, the antenna 11 is arranged in the traveling direction of the vehicle 10 with respect to the antenna 13. Therefore, as shown in FIG. 7, the position of the antenna 11 becomes the future position of the antenna 13 while the vehicle 10 is moving forward. The communication device 100 (communication processing unit 153) transmits an uplink reference signal through the antenna 11 and communicates with the base station 200 through the antenna 13. Therefore, the result of the measurement based on the uplink reference signal becomes effective at the timing when the antenna 13 reaches the position of the antenna 11 at the time of transmitting the uplink reference signal. The period required for the antenna 13 to reach the position of the antenna 11 is calculated by [distance between the antenna 11 and the antenna 13] ÷ [speed of the vehicle 10].

(2) Timing information For example, the timing information indicates the timing at which the result of the measurement becomes valid. For example, the timing information indirectly indicates the timing.

Specifically, for example, the timing information indicates a period between the timing at which the measurement result becomes valid and the timing at which the uplink reference signal is transmitted.

For example, referring to the example of FIG. 25, at timing 41, the communication device 100 transmits an uplink reference signal (UL RS). The base station 200 receives the UL RS and makes a measurement based on the UL RS. The result of the measurement becomes valid at timing 43. For example, referring to the example of FIG. 7 again, at the timing 41, the UL RS is transmitted through the antenna 11, and at the timing 43, the antenna 13 reaches the position of the antenna 11 at the timing 41. Therefore, the result of the measurement based on the UL RS becomes valid at the timing 43. In such an example, the timing information indicates a period 45 between timing 41 and timing 43. The period 45 is calculated as follows, for example.
[Period 45] = [Distance between antenna 11 and antenna 13] ÷ [Velocity of vehicle 10]

This makes it possible to suppress the amount of the timing information, for example.

The timing information indicates the period by, for example, a wireless frame, a subframe, a slot, or a symbol. Alternatively, the timing information may indicate the period by a combination of two or more of a radio frame, a subframe, a slot, and a symbol. This facilitates, for example, timing identification in the RAN.

(3) Transmission of Timing Information-Transmission of Timing Information According to Configuration Information Base station 200 (transmission processing unit 251) transmits an RRC message including configuration information for transmission of the timing information. The configuration information can also be said to be information constituting the communication device 100 so as to transmit the timing information.

For example, when the communication device 100 (communication processing unit 153) receives the RRC message including the configuration information for transmitting the timing information, the communication device 100 transmits the timing information by uplink according to the configuration information. On the other hand, when the communication device 100 (communication processing unit 153) does not receive the RRC message including the configuration information, the communication device 100 does not transmit the timing information by uplink. In this case, the communication device 100 (communication processing unit 153) may transmit the uplink reference signal through the antenna 13 instead of the antenna 11.

Referring to FIG. 26, the base station 200 (transmission processing unit 251) transmits an RRC message including configuration information for transmitting the timing information to the communication device 100, and the communication device 100 (communication processing unit 153) displays the RRC message. The RRC message is received (S401). The communication device 100 (communication processing unit 153) transmits a response message to the RRC message to the base station 200 (S403). For example, the configuration information is included in the SRS-Config in the RRC message. For example, the RRC message is an RRCReconification message, and the response message is an RRCReconnectionComplete message.

This makes it possible to flexibly control the transmission of the timing information, for example. In other words, this allows for flexible control of the uplink reference signal, for example.

-Method of transmitting timing information For example, the communication device 100 (communication processing unit 153) transmits the uplink reference signal and the timing information in the same slot. For example, the communication device 100 (communication processing unit 153) transmits the timing information in the physical control channel (for example, PUCCH) in the slot in which the uplink reference signal is transmitted. That is, the communication device 100 (communication processing unit 153) transmits the timing information by signaling the physical layer in the slot.

For example, referring to FIG. 27, at the timing 41, the communication device 100 transmits the UL RS and the timing information, and the base station 200 receives the UL RS and the timing information. In this example, the timing 41 is one slot. The result of the measurement based on UL-RS is valid at timing 43, and the timing information indicates the period 27 between timing 43 and timing 41.

This makes it possible to easily notify the base station 200 of, for example, the correspondence between the uplink reference signal and the timing information.

-Trigger for transmission of timing information For example, the communication device 100 (communication processing unit 153) transmits the timing information by uplink every period (for example, a slot or a cycle) for transmitting an uplink reference signal. Alternatively, the communication device 100 (communication processing unit 153) transmits the timing information by uplink for each request for transmission of the uplink reference signal.

This makes it possible, for example, to notify the base station 200 in detail when the measurement result based on the uplink reference signal becomes valid.

(4) Measurement and Scheduling For example, the base station 200 (control unit 255) performs measurement based on the reference signal transmitted by the communication device 100. For example, the measurement includes channel estimation, SINR (Signal to Interference plus Noise Ratio) measurement, identification of the best resource block, calculation of a preferred precoding matrix, calculation of a preferred number of layers, and the like.

Further, for example, the base station 200 (control unit 255) performs scheduling for the communication device 100 based on the measurement result and the timing information.

Referring to FIG. 28, the base station 200 (control unit 255) receives the UL RS and the timing information transmitted by the communication device 100 at the timing 41, and performs the measurement based on the UL RS. The base station 200 (control unit 255) identifies the timing 43 from which the measurement result becomes valid from the timing 41 and the period 45 indicated by the timing information. Then, the base station 200 (control unit 255) schedules the uplink (for example, resource allocation) for the slot near the timing 43 based on the result of the above measurement. The base station 200 (control unit 255) transmits DCI for resource allocation in the slot to the communication device 100. The communication device 100 (communication processing unit 153) transmits data to the base station 200 in the slot based on the DCI. For example, the slot offset (that is, the offset between the DCI slot and the resource slot) is 1, and the DCI is transmitted in the slot immediately preceding the slot in which the data is transmitted.

This allows, for example, efficient use of radio resources based on valid information about the state of the channel.

Although an example of uplink scheduling has been described with reference to FIG. 28, the second embodiment is not limited to this example. For example, the communication device 100 and the base station 200 may communicate by TDD (Time Division Duplex), or downlink communication may be performed in a slot near the timing 43. In this case, the base station 200 (control unit 255) may schedule the downlink for the slot based on the result of the measurement. Hereinafter, an example of uplink scheduling will be mainly described, but the above-mentioned points are the same in the following description.

(5) Specific Example A specific example of the operation will be described with reference to FIG. 29.

The communication device 100 transmits UL RS ₁ through the antenna 11 in slot 1 and transmits timing information through the antenna 13. The timing information indicates the period ΔT ₁ . Since the timing at which the antenna 13 reaches the position of the antenna 11 in the slot 1 is the slot 4, ΔT ₁ is 3 slots (= slot 4-slot 1).

Further, the communication device 100 transmits UL RS ₂ through the antenna 11 in slot 2 and transmits timing information through the antenna 13. The timing information indicates the period ΔT ₂ . Since the timing at which the antenna 13 reaches the position of the antenna 11 in the slot 2 is the slot 6, ΔT ₂ is 4 slots (= slot 6-slot 2).

The timing at which the result of the measurement based on UL RS ₁ (hereinafter referred to as the first measurement) becomes effective is slot 4 (= slot 1 + ΔT ₁ ), and the measurement based on UL RS ₂ (hereinafter referred to as the second measurement). The timing at which the result of (call) becomes valid is slot 6 (= slot 2 + ΔT ₂ ). Therefore, the base station 200 schedules the slot 4 based on the result of the first measurement, and schedules the slot 6 based on the result of the second measurement. For example, the base station 200 allocates the radio resource of the slot 4 to the communication device 100 based on the result of the first measurement. The base station 200 transmits DCI ₁ for the radio resource to the communication device 300 in slot 3, and the communication device 100 transmits data to the base station 200 in slot 4 based on the DCI ₁ . Further, the base station 200 allocates the radio resource of the slot 6 to the communication device 100 based on the result of the second measurement. The base station 200 transmits DCI ₂ for the radio resource to the communication device 300 in slot 5, and the communication device 100 transmits data to the base station 200 in slot 6 based on the DCI ₂ .

For slot 5, the base station 200 may allocate the radio resources of slot 5 to the communication device 100 based on either the result of the first measurement or the result of the second measurement. Alternatively, the base station 200 may allocate the radio resource in slot 5 to the communication device 100 based on both the result of the first measurement and the result of the second measurement.

In the example of FIG. 29, the communication device 100 (communication processing unit 153) may transmit data in one of the slot 4 and the slot 6 instead of transmitting the data in both the slot 4 and the slot 6. For example, when the result of the second measurement is better than the result of the first measurement, the base station 200 (control unit 255) does not allocate the radio resource of the slot 4 to the communication device 100. The radio resource in slot 6 may be allocated to the communication device 100. As a result, the communication device 100 (communication processing unit 153) may not transmit the data in the slot 4 but may transmit the data in the slot 6.

<3.4. Modification example>
A modification of the second embodiment of the present disclosure will be described with reference to FIGS. 30 to 33. As a matter of course, two or more of the modifications described below may be combined.

(1) First Modification Example: Antenna In the above-mentioned specific example of the second embodiment, the antenna 11 and the antenna 13 are arranged in the vehicle 10. However, the antenna according to the second embodiment is, of course, not limited to this example.

In the first modification of the second embodiment, the vehicle 10 may have three or more antennas arranged along the traveling direction of the vehicle 10. For example, as shown in FIG. 13, twelve antennas 15 (antennas 15A to 15L) may be arranged in the vehicle 10 along the traveling direction of the vehicle 10. For example, the communication device 100 (communication processing unit 153) may transmit an uplink reference signal through the antenna 15A. Further, the communication device 100 (communication processing unit 153) may communicate with the base station 200 through one of the antennas 15B to 15L. The communication device 100 (communication processing unit 153) may selectively use one of the antennas 15B to 15L. Since the timing at which the result of the measurement based on the uplink reference signal becomes valid depends on the antenna selected, the timing information may be generated based on the antenna selected.

(2) Second modification: Timing information In the above-mentioned specific example of the second embodiment, measurement is performed based on the uplink reference signal in one slot. Further, in the above-described specific example of the second embodiment, the timing information is transmitted for the uplink reference signal in one slot. Further, in the above-described specific example of the second embodiment, the timing information indicates a specific slot as the timing at which the result of the measurement becomes valid. However, the second embodiment is, of course, not limited to this example.

In the second modification of the second embodiment, the base station 200 (control unit 255) may make measurements based on the uplink reference signals in the plurality of slots. The communication device 100 may transmit timing information regarding the timing at which the measurement result becomes valid via an uplink. The timing information may be transmitted in one of the plurality of slots. The base station 200 (control unit 255) may perform scheduling for the communication device 100 based on the result of the above measurement and the timing information.

The timing indicated by the timing information may be a period spanning a plurality of slots.

(3) Third Modification Example: Timing Information In the above-mentioned specific example of the second embodiment, the timing information is the timing at which the measurement result becomes valid and the timing at which the uplink reference signal is transmitted. Indicates the period between and. However, the timing information according to the second embodiment is, of course, not limited to this example.

In the third modification of the second embodiment, the timing information may directly indicate the timing at which the result of the measurement becomes valid. Referring again to FIG. 25, the timing information may indicate the timing 43 itself.

As a result, for example, more flexible transmission of timing information becomes possible, and the base station 200 can identify the timing at which the measurement result becomes valid only from the timing information.

For example, the timing information may indicate the timing (for example, timing 43 in FIG. 25) in which the result of the measurement becomes valid by the system frame number, the subframe number, the slot number, and the symbol number. Alternatively, the timing information may indicate the timing (for example, timing 43 in FIG. 25) by a combination of two or more of the system frame number, the subframe number, the slot number, and the symbol number. This facilitates, for example, timing identification in the RAN.

(4) Fourth Modification Example: Transmission of Timing Information In the above-mentioned specific example of the second embodiment, the timing information is information different from the uplink reference signal. However, the transmission of timing information according to the second embodiment is, of course, not limited to this example.

In the fourth modification of the second embodiment, the timing information may be a sequence of the uplink reference signal, and the sequence corresponds to the timing among a plurality of predetermined sequences. It may be a sequence to be performed. That is, the timing information may be information embedded in the uplink reference signal.

For example, one or more corresponding sequences are prepared for each of the plurality of timings (for example, a plurality of ΔTs). The communication device 100 (generation unit 151) calculates the timing at which the measurement result based on the uplink reference signal becomes valid, and selects one of one or more sequences corresponding to the timing. The selected sequence becomes the timing information regarding the above timing. The communication device 100 (communication processing unit 153) transmits an uplink reference signal including the selected sequence.

This makes it possible to notify the base station 200 of the timing at which the measurement based on the uplink reference signal becomes effective without transmitting information other than the uplink reference signal, for example.

(5) Fifth Modification Example: Transmission of Timing Information In the above-described specific example of the second embodiment, the communication device 100 (communication processing unit 153) transmits the timing information by signaling of the physical layer. However, the transmission of timing information according to the second embodiment is, of course, not limited to this example.

In the fifth modification of the second embodiment, the communication device 100 (communication processing unit 153) transmits a MAC control element including the timing information or an RRC message including the timing information by uplink. May be good.

This makes it possible, for example, to reduce the signaling overhead of the physical layer.

In addition, in order to supplement the time lag due to MAC signaling or RRC signaling, default timing information may be defined in advance. The base station 200 (control unit 255) may appropriately use the default timing information.

(6) Sixth Modification Example: Trigger for Transmission of Timing Information In the above-described specific example of the second embodiment, the communication device 100 (communication processing unit 153) transmits an uplink reference signal (for example, a slot). Or cycle), the above timing information is transmitted by uplink. Alternatively, the communication device 100 (communication processing unit 153) transmits the timing information by uplink for each request for transmission of the uplink reference signal. That is, the timing information is transmitted so as to follow the uplink reference signal. However, the transmission of timing information according to the second embodiment is, of course, not limited to this example.

-First Example: Transmission in Responsibility In the sixth modification of the second embodiment, the base station 200 (transmission processing unit 251) is a downlink control including request information for requesting transmission of the timing information. Information (DCI) may be transmitted to the communication device 100. The communication device 100 (communication processing unit 153) may transmit the timing information by uplink in response to the reception of the DCI including the request information. The request information may be an SRS request set to a value requesting transmission of the timing information.

Referring to the example of FIG. 30, the base station 200 (transmission processing unit 251) transmits a DCI including an SRS request set to a value requesting transmission of timing information to the communication device 100 (S411). In response to the SRS request, the communication device 100 (communication processing unit 153) transmits UL RS and timing information regarding the timing at which the measurement result based on the UL RS becomes valid to the base station 200 (S413). .. The communication device 100 may transmit the timing information in response to the SRS request without transmitting the UR RS.

This makes it possible to flexibly control the transmission of the timing information, for example.

-Second Example: Periodic Transmission In the sixth modification of the second embodiment, the communication device 100 (communication processing unit 153) may periodically transmit the timing information by uplink.

Referring to the example of FIG. 31, the communication device 100 (communication processing unit 153) periodically transfers the UL RS and timing information regarding the timing at which the measurement result based on the UL RS becomes valid to the base station 200. Transmit (S421, S423, S425). The communication device 100 (communication processing unit 153) may transmit timing information without transmitting UL RS.

This makes it possible, for example, to transmit the timing information without using DCI.

(7) Seventh Modification Example: Timing Restriction In the above-mentioned specific example of the second embodiment, there is no particular restriction on the timing at which the measurement result based on the uplink reference signal becomes valid. However, the second embodiment is, of course, not limited to this example.

-First example: Minimum period In the seventh modification of the second embodiment, the timing at which the measurement result becomes valid is a predetermined minimum period or more than the timing at which the uplink reference signal is transmitted. It may be late.

Referring to the example of FIG. 32, the timing 43 at which the result of the measurement based on the UL RS becomes valid is later than the timing 41 at which the UL RS is transmitted by a minimum period of 47 or more. In other words, the period 45 indicated by the timing information is longer than the minimum period 47.

This allows, for example, the base station 200 to secure sufficient time for scheduling.

The base station 200 (transmission processing unit 251) has a minimum period (for example, timing 41) between the timing at which the measurement result becomes valid (for example, timing 43) and the timing at which the uplink reference signal is transmitted (for example, timing 41). For example, the period information indicating the minimum period 47) may be transmitted by a downlink. The communication device 100 (communication processing unit 153) may receive the period information indicating the minimum period by downlink.

This allows, for example, the base station 200 to secure sufficient time for scheduling under its own control.

-Second example: Maximum period In the seventh modification of the second embodiment, the timing at which the measurement result becomes valid is within a predetermined maximum period from the timing at which the uplink reference signal is transmitted. There may be.

Referring to the example of FIG. 33, the timing 43 at which the measurement result based on the UL RS becomes valid is within a maximum period 49 from the timing 41 at which the UL RS is transmitted. In other words, the period 45 indicated by the timing information is shorter than the maximum period 49.

This makes it possible, for example, to avoid the use of measurement results whose accuracy has deteriorated due to channel fluctuations over a long period of time.

The maximum period may be a period according to the frequency band in which the uplink reference signal is transmitted. For example, the higher the frequency of the frequency band, the shorter the maximum period may be, as the channel is more volatile in the higher frequency band. In other words, the lower the frequency in the frequency band, the longer the maximum period may be. This makes it possible to make predictions suitable for frequencies, for example.

The base station 200 (transmission processing unit 251) has a maximum period (for example, timing 41) between the timing at which the measurement result becomes valid (for example, timing 43) and the timing at which the uplink reference signal is transmitted (for example, timing 41). For example, the period information indicating the maximum period 49) may be transmitted by a downlink. The communication device 100 (communication processing unit 153) may receive the period information indicating the maximum period by downlink.

This makes it possible to avoid the use of measurement results with reduced accuracy, for example, due to the control performed by the base station 200.

-Third Example: Minimum Period + Maximum Period In the seventh modification of the second embodiment, the above two examples may be combined. That is, the timing at which the measurement result becomes valid may be later than the minimum period or more than the timing at which the uplink reference signal is transmitted, and may be within the maximum period from the timing. The period information may indicate both the minimum period and the minimum period.

-Transmission and reception of period information The base station 200 (transmission processing unit 251) may transmit an RRC message including the period information by downlink, and the communication device 100 (communication processing unit 153) downlinks the RRC message. You may receive it at. In this case, the period information may be included in the SRS-Config in the RRC message. This makes it possible, for example, to reduce the signaling overhead of the lower layer.

Alternatively, the base station 200 (transmission processing unit 251) may transmit the MAC control element including the period information by downlink, and the communication device 100 (communication processing unit 153) receives the MAC control element. May be good. Alternatively, the base station 200 (transmission processing unit 241) may transmit downlink control information (DCI) including the period information by downlink, and the communication device 100 (communication processing unit 153) receives the DCI. You may. This makes it possible, for example, to send and receive period information at a higher speed.

Referring again to the example of FIG. 22, the base station 200 (transmission processing unit 251) transmits the period information by downlink, and the communication device 100 (communication processing unit 153) receives the period information (S331).

(8) Eighth modification: Duration information In the eighth modification of the second embodiment, the communication device 100 (communication processing unit 153) effectively obtains the result of the above measurement based on the uplink reference signal. You may send the duration information about the duration by uplink. The base station 200 (reception processing unit 253) may receive the duration information from the communication device 100. For example, the duration information may be information indicating the duration.

For example, the communication device 100 (communication processing unit 153) may transmit the duration information together with the timing information by uplink.

Alternatively, the timing information may include the duration information. As an example, the timing information may include an information element regarding the timing at which the measurement result becomes valid and an information element regarding the duration at which the measurement result becomes valid (that is, duration information). As another example, the timing information may be an information element relating to both the timing and the duration at which the result of the measurement becomes valid (eg, an information element indicating both the timing and the duration).

This allows, for example, base station 200 to utilize valid information about the state of the channel over a duration.

(9) Ninth Modification Example: Accuracy Degradation Information In the ninth modification of the second embodiment, the communication device 100 (communication processing unit 153) performs the measurement according to the time gap with the timing. Information about the deterioration of the accuracy of the result may be transmitted by the uplink. The base station 200 (reception processing unit 243) may receive the accuracy reduction information from the communication device 100. For example, the accuracy reduction information may be information indicating the accuracy reduction according to the gap.

For example, the communication device 100 (communication processing unit 143) may transmit the accuracy reduction information together with the timing information by uplink.

Alternatively, the timing information may include the accuracy reduction information. As an example, the timing information is an information element relating to a timing at which the measurement result becomes valid and an information element relating to a decrease in accuracy of the measurement result according to a time gap with the timing (that is, accuracy reduction information). ) And may be included. As another example, the timing information may be an information element relating to both the timing and the decrease in accuracy (for example, an information element indicating both the timing and the decrease in accuracy).

This makes it possible, for example, to avoid the use of measurement results with reduced accuracy.

<< 4. Modification example >>
An example of modification common to the embodiments of the present disclosure will be described. As a matter of course, two or more of the modifications described below may be combined.

(1) First modification: vehicle 10 and communication device 100
In the above-mentioned specific example of the embodiment of the present disclosure, the communication device 100 is an in-vehicle device that can be mounted on the vehicle 10. However, the communication device 100 of the present disclosure is, of course, not limited to this example.

In the first modification common to the embodiments, the communication device 100 does not have to be the in-vehicle device.

As an example, the communication device 100 may be the vehicle 10 itself, not the in-vehicle device.

As another example, the communication device 100 may be included in a moving body other than the vehicle 10, and may be a device that can be mounted on the moving body. Alternatively, the communication device 100 may be the mobile body itself. The moving body may be a flight device. As an example, the flight device may be a drone.

As yet another example, the communication device 100 may be a communication module included in a device that can be mounted on a moving body (for example, a vehicle 10 or a flight device). As an example, the communication module may be a communication chip (for example, a baseband processor).

(2) Second modification: Base station 200
In the above-mentioned specific example of the embodiment of the present disclosure, the base station 200 is a gNB which is a 5G base station. However, the base station 200 of the present disclosure is, of course, not limited to this example.

As an example, the base station 200 may be a DU included in the gNB. In this case, the network interface 287 of the base station 200 may be an interface for communication with the CU included in the gNB.

As another example, the base station 200 may be a RU (Radio Unit) included in the gNB. In this case, the network interface 287 of the base station 200 may be an interface for communication with the DU included in the gNB.

(3) Third modification: Communication system 1
In the above-described specific example of the embodiment of the present disclosure, communication using 5G is performed in the communication system 1. However, the base station 200 of the present disclosure is, of course, not limited to this example.

As an example, in the communication system 1, communication using LTE or 4G may be performed. In this case, the base station 200 may be an eNB.

As another example, in the communication system 1, communication may be performed using the next generation mobile communication technique (for example, 6G) of 5G. In this case, the base station 200 may be a 6G base station.

Although one embodiment of the present disclosure has been described above, the present disclosure is not limited to the embodiment. It will be appreciated by those skilled in the art that the embodiments are merely exemplary and that various modifications are possible without departing from the scope and spirit of the present disclosure.

For example, the steps in the processes described herein do not necessarily have to be performed in chronological order in the order described in the drawings. For example, the steps in the process may be performed in a different order than shown in the drawings, or in parallel. In addition, some of the steps in the process may be deleted, and additional steps may be added to the process.

For example, a method including the operation of the components of the communication device described in the present specification (for example, a generation unit and a communication processing unit, or a transmission processing unit, a reception processing unit, and a control unit) may be provided, and the above configuration may be provided. A program may be provided to cause the processor to perform the operation of the element. Further, a non-transitional substantive recording medium that can be read by the computer on which the program is recorded may be provided. Of course, such methods, programs, and computer-readable non-transitional substantive recording media are also included in the present disclosure.

The technical features included in the above-described embodiment may be expressed as the following features. Of course, the present disclosure is not limited to such technical features.

(Feature 1)
A generator (141) that generates channel state information by measurement based on a downlink reference signal, and
A communication processing unit (143) that transmits the timing information regarding the timing (25) at which the channel state information becomes valid and the channel state information by uplink, and the communication processing unit (143).
(100).

(Feature 2)
The communication device according to feature 1, wherein the downlink reference signal is a channel state information reference signal (CSI-RS).

(Feature 3)
When the communication processing unit receives an RRC (Radio Resource Control) message including configuration information for transmitting the timing information, the communication processing unit transmits the timing information by uplink according to the configuration information, according to feature 1 or 2. The communication device described.

(Feature 4)
The communication device according to feature 3, wherein the configuration information is included in the CSI-reportConfig in the RRC message.

(Feature 5)
The item according to any one of features 1 to 4, wherein the communication processing unit transmits the timing information by uplink in response to receiving the downlink control information including the request information requesting the transmission of the timing information. Communication device.

(Feature 6)
The communication device according to feature 5, wherein the request information is a CSI request set to a value for requesting transmission of the timing information.

(Feature 7)
The communication device according to any one of features 1 to 6, wherein the communication processing unit periodically transmits the timing information by uplink.

(Feature 8)
The communication device according to any one of features 1 to 7, wherein the timing information indicates the timing at which the channel state information becomes valid.

(Feature 9)
The communication device according to feature 8, wherein the timing information indicates a period between the timing at which the channel state information becomes valid and another timing related to the channel state information.

(Feature 10)
The communication device according to feature 9, wherein the other timing is a timing (23) at which the channel state information is transmitted by uplink.

(Feature 11)
The communication device according to feature 9 or 10, wherein the timing information indicates the period by means of a wireless frame, a subframe, a slot, a symbol, or a combination of two or more of a wireless frame, a subframe, a slot, and a symbol. ..

(Feature 12)
The communication device according to any one of the features 8, wherein the timing information directly indicates the timing at which the channel state information becomes valid.

(Feature 13)
The timing information indicates the timing by a combination of two or more of a system frame number, a subframe number, a slot number, a symbol number, or a system frame number, a subframe number, a slot number, and a symbol number. 12. The communication device according to 12.

(Feature 14)
The item according to any one of features 1 to 13, wherein the communication processing unit transmits a set of the channel state information and the timing information on a PUCCH (Physical Uplink Control Channel) or a PUSCH (Physical Uplink Shared Channel). Communication device.

(Feature 15)
The communication device according to feature 14, wherein the communication processing unit transmits a plurality of different sets of the channel state information and the timing information in one slot.

(Feature 16)
The communication device according to feature 15, wherein the communication processing unit transmits a larger number of sets of the channel state information and the timing information in the PUSCH than in the PUCCH.

(Feature 17)
The generator generates a plurality of channel state information corresponding to each of the plurality of timings by measurement based on the downlink reference signals transmitted at the plurality of timings.
The communication processing unit uploads the timing information regarding the timing at which each of the plurality of channel state information becomes valid, the timing information common to the plurality of channel state information, and the plurality of channel state information. Send by link,
The communication device according to any one of the features 1 to 11.

(Feature 18)
The communication processing unit transmits the timing information by uplink together with the first channel state information of the plurality of channel state information, and then uploads the other channel state information of the plurality of channel state information. The communication device according to feature 17, which is transmitted by a link.

(Feature 19)
The communication device according to feature 17, wherein the communication processing unit transmits a MAC (Medium Access Control) control element including the timing information or an RRC message including the timing information by uplink.

(Feature 20)
The timing at which the channel state information becomes effective is described in any one of features 1 to 19, which is later than the timing (23) at which the channel state information is transmitted by the uplink by a predetermined minimum period (31) or more. Communication device.

(Feature 21)
The communication processing unit downlinks period information indicating a minimum period (31) between the timing at which the channel state information becomes valid and the timing (23) at which the channel state information is transmitted by uplink. The communication device according to any one of the features 1 to 20, which is received by.

(Feature 22)
The timing at which the channel state information becomes valid is described in any one of features 1 to 21, wherein the timing is within a predetermined maximum period (33) from the timing (23) when the channel state information is transmitted by the uplink. Communication device.

(Feature 23)
The communication processing unit downlinks period information indicating a maximum period (33) between the timing at which the channel state information becomes valid and the timing (23) at which the channel state information is transmitted by uplink. The communication device according to any one of the features 1 to 22, which is received by.

(Feature 24)
The communication device according to feature 22 or 23, wherein the maximum period is a period depending on the frequency band in which the downlink reference signal is transmitted.

(Feature 25)
The communication device according to feature 21 or 23, wherein the communication processing unit receives an RRC message including the period information.

(Feature 26)
The communication device according to feature 25, wherein the period information is included in the CSI-reportConfig in the RRC message.

(Feature 27)
The communication device according to feature 21 or 23, wherein the communication processing unit receives the MAC control element including the period information or the downlink control information including the period information.

(Feature 28)
The communication device according to any one of features 1 to 27, wherein the communication processing unit transmits the duration information regarding the duration in which the channel state information is valid by uplink.

(Feature 29)
The communication according to any one of features 1 to 28, wherein the communication processing unit transmits information on the decrease in accuracy of the channel state information according to a time gap with the timing by uplink. Device.

(Feature 30)
The communication device according to any one of features 1 to 29, wherein the channel state information is channel state information predicted for the timing.

(Feature 31)
The generator generates the channel state information by measurement based on the downlink reference signal received through the first antenna (11).
The communication processing unit communicates through the second antenna (13).
The communication device according to any one of the features 1 to 30.

(Feature 32)
The communication device is a vehicle (10) or an in-vehicle device that can be mounted on the vehicle.
The first antenna is an antenna arranged in front of the second antenna in the vehicle.
The communication device according to feature 31.

(Feature 33)
The communication device according to any one of features 1 to 30, wherein the generation unit generates the channel state information by the measurement and the prediction processing using the measurement result.

(Feature 34)
A transmission processing unit (241) that transmits a downlink reference signal, and
The reception processing unit (243) that receives the channel state information generated by the measurement based on the downlink reference signal and the timing information regarding the timing (25) at which the channel state information becomes valid from the communication device (100). ,
Base station (200).

(Feature 35)
The base station according to feature 34, further comprising a control unit (245) that performs scheduling for the communication device based on the timing information and the channel state information.

(Feature 36)
The base station according to feature 34 or 35, wherein the transmission processing unit transmits an RRC (Radio Resource Control) message including configuration information for transmitting the timing information to the communication device.

(Feature 37)
The base station according to any one of features 34 to 36, wherein the transmission processing unit transmits downlink control information including request information for requesting transmission of the timing information to the communication device.

(Feature 38)
The transmission processing unit downlinks the period information indicating the minimum period (31) between the timing at which the channel state information becomes valid and the timing (23) at which the channel state information is transmitted by the uplink. The base station according to any one of the features 34 to 37, which is transmitted by.

(Characteristic 39)
The transmission processing unit downlinks period information indicating a maximum period (33) between the timing at which the channel state information becomes valid and the timing (23) at which the channel state information is transmitted by the uplink. The base station according to any one of the features 34 to 38, which is transmitted by.

(Feature 40)
It is a method performed by the communication device (100).
Generating channel state information by measurements based on downlink reference signals,
The timing information regarding the timing (25) at which the channel state information becomes valid and the channel state information are transmitted by uplink.
How to include.

(Feature 41)
On the computer
Generating channel state information by measurements based on downlink reference signals,
The timing information regarding the timing (25) at which the channel state information becomes valid and the channel state information are transmitted by uplink.
A program to execute.

(Feature 42)
On the computer
Generating channel state information by measurements based on downlink reference signals,
The timing information regarding the timing (25) at which the channel state information becomes valid and the channel state information are transmitted by uplink.
A non-transitional substantive recording medium that can be read by a computer that records a program for executing.

(Feature 43)
This is a method performed by the base station (200).
Sending a downlink reference signal and
Receiving the channel state information generated by the measurement based on the downlink reference signal and the timing information regarding the timing (25) at which the channel state information becomes valid from the communication device (100).
How to include.

(Feature 44)
On the computer
Sending a downlink reference signal and
Receiving the channel state information generated by the measurement based on the downlink reference signal and the timing information regarding the timing (25) at which the channel state information becomes valid from the communication device (100).
A program to execute.

(Feature 45)
On the computer
Sending a downlink reference signal and
Receiving the channel state information generated by the measurement based on the downlink reference signal and the timing information regarding the timing (25) at which the channel state information becomes valid from the communication device (100).
A non-transitional substantive recording medium that can be read by a computer that records a program for executing.

(Feature 46)
Communication device (100)
A generation unit (151) that generates timing information regarding the timing (43) at which the measurement result based on the uplink reference signal transmitted by the communication device becomes valid, and
A communication processing unit (153) that transmits the timing information via an uplink,
A communication device equipped with.

(Feature 47)
The communication device according to feature 46, wherein the uplink reference signal is a sounding reference signal (SRS).

(Feature 48)
When the communication processing unit receives an RRC (Radio Resource Control) message including configuration information for transmitting the timing information, the communication processing unit transmits the timing information by uplink according to the configuration information, according to the feature 46 or 47. The communication device described.

(Feature 49)
The item according to any one of features 46 to 48, wherein the communication processing unit transmits the timing information by uplink in response to receiving the downlink control information including the request information requesting the transmission of the timing information. Communication device.

(Feature 50)
The communication device according to feature 49, wherein the request information is an SRS request set to a value for requesting transmission of the timing information.

(Feature 51)
The communication device according to any one of features 46 to 50, wherein the communication processing unit periodically transmits the timing information by uplink.

(Feature 52)
The communication device according to any one of features 46 to 51, wherein the timing information indicates the timing at which the measurement result becomes valid.

(Feature 53)
The communication device according to feature 52, wherein the timing information indicates a period (45) between the timing at which the measurement result becomes valid and the timing (41) at which the uplink reference signal is transmitted.

(Feature 54)
The communication device according to feature 53, wherein the timing information indicates the period by means of a wireless frame, a subframe, a slot, a symbol, or a combination of two or more of a wireless frame, a subframe, a slot, and a symbol.

(Feature 55)
The communication device according to feature 52, wherein the timing information directly indicates the timing at which the measurement result becomes valid.

(Feature 56)
The timing information indicates the timing by a combination of two or more of a system frame number, a subframe number, a slot number, a symbol number, or a system frame number, a subframe number, a slot number, and a symbol number. 55. The communication device.

(Feature 57)
The communication according to any one of features 46 to 56, wherein the timing at which the measurement result becomes valid is later than a predetermined minimum period (47) or more than the timing (41) at which the uplink reference signal is transmitted. Device.

(Feature 58)
The communication processing unit receives, on the downlink, period information indicating the minimum period (47) between the timing at which the measurement result becomes valid and the timing (41) at which the uplink reference signal is transmitted. The communication device according to any one of the features 46 to 57.

(Feature 59)
The communication according to any one of features 46 to 58, wherein the timing at which the measurement result becomes valid is within a predetermined maximum period (49) from the timing (41) at which the uplink reference signal is transmitted. Device.

(Feature 60)
The communication processing unit receives, on the downlink, period information indicating the maximum period (49) between the timing at which the measurement result becomes valid and the timing (41) at which the uplink reference signal is transmitted. The communication device according to any one of the features 46 to 59.

(Feature 61)
The communication device according to feature 59 or 60, wherein the maximum period is a period depending on the frequency band in which the uplink reference signal is transmitted.

(Feature 62)
The communication according to feature 58 or 60, wherein the communication processing unit receives an RRC message including the period information, a MAC control element including the period information, or a downlink control information including the period information on the downlink. Device.

(Feature 63)
The communication device according to any one of the features 46 to 62, wherein the communication processing unit transmits the duration information regarding the duration in which the measurement result becomes valid by uplink.

(Feature 64)
The communication device according to any one of features 46 to 63, wherein the communication processing unit transmits information on the decrease in accuracy of the measurement according to a time gap with the timing by uplink.

(Feature 65)
The communication device according to any one of features 46 to 64, wherein the communication processing unit transmits the uplink reference signal and the timing information in the same slot.

(Feature 66)
The timing information is a sequence of the uplink reference signals.
The sequence is a sequence corresponding to the timing among a plurality of predetermined sequences.
The communication device according to any one of the features 46 to 64.

(Feature 67)
The communication device according to any one of features 46 to 66, wherein the communication processing unit transmits the uplink reference signal through the first antenna (11) and communicates through the second antenna (13).

(Feature 68)
The communication device is a vehicle (10) or an in-vehicle device that can be mounted on the vehicle.
The first antenna is an antenna arranged in front of the second antenna in the vehicle.
The communication device according to feature 67.

(Feature 69)
Reception processing unit (253) that receives the uplink reference signal transmitted by the communication device,
Equipped with
The reception processing unit receives from the communication device timing information regarding the timing (43) at which the measurement result based on the uplink reference signal becomes valid.
Base station (200).

(Feature 70)
The base station according to feature 69, further comprising a transmission processing unit (251) for transmitting an RRC (Radio Resource Control) message including configuration information for transmitting the timing information.

(Feature 71)
The base station according to feature 69 or 70, further comprising a transmission processing unit (251) for transmitting downlink control information including request information for requesting transmission of the timing information to the communication device.

(Feature 72)
A transmission processing unit (251) that transmits downlink period information indicating a minimum period (47) between the timing at which the measurement result becomes valid and the timing (41) at which the uplink reference signal is transmitted. ), The base station according to any one of the features 69 to 71.

(Feature 73)
A transmission processing unit (251) that transmits downlink period information indicating a maximum period (49) between the timing at which the measurement result becomes valid and the timing (41) at which the uplink reference signal is transmitted. ), The base station according to any one of the features 69 to 72.

(Feature 74)
The base according to feature 72 or 73, wherein the transmission processing unit transmits an RRC message including the period information, a MAC control element including the period information, or a downlink control information including the period information by downlink. Station.

(Feature 75)
It is a method performed by the communication device (100).
Generating timing information regarding the timing (43) at which the measurement result based on the uplink reference signal transmitted by the communication device becomes valid, and
Sending the timing information via an uplink and
How to include.

(Feature 76)
On the computer
Generating timing information regarding the timing (43) at which the measurement result based on the uplink reference signal transmitted by the communication device becomes valid, and
Sending the timing information via an uplink and
A program to execute.

(Feature 77)
On the computer
Generating timing information regarding the timing (43) at which the measurement result based on the uplink reference signal transmitted by the communication device becomes valid, and
Sending the timing information via an uplink and
A non-transitional substantive recording medium that can be read by a computer that records a program for executing.

(Feature 78)
This is a method performed by the base station (200).
Receiving the uplink reference signal transmitted by the communication device and
Receiving timing information from the communication device regarding the timing (43) at which the measurement result based on the uplink reference signal becomes valid, and
How to include.

(Feature 79)
On the computer
Receiving the uplink reference signal transmitted by the communication device and
Receiving timing information from the communication device regarding the timing (43) at which the measurement result based on the uplink reference signal becomes valid, and
A program to execute.

(Feature 80)
On the computer
Receiving the uplink reference signal transmitted by the communication device and
Receiving timing information from the communication device regarding the timing (43) at which the measurement result based on the uplink reference signal becomes valid, and
A non-transitional substantive recording medium that can be read by a computer that records a program for executing.

(Feature 81)
The communication according to any one of features 1 to 33 and 46 to 68, wherein the communication device is a mobile body, a device that can be mounted on the mobile body, or a communication module included in the device that can be mounted on the mobile body. Device.

(Feature 82)
The communication device according to feature 81, wherein the moving body is a vehicle or a flight device.

(Feature 83)
The base according to any one of the features 34 to 39 and 69 to 74, wherein the communication device is a mobile body, a device that can be mounted on the mobile body, or a communication module included in the device that can be mounted on the mobile body. Station.

(Feature 84)
The base station according to feature 83, wherein the mobile is a vehicle or a flight device.

1 Communication system 10 Vehicle 11, 1315, 17 Antenna 23, 25, 41, 43 Timing 27, 45 Period 31, 47 Minimum period 33, 49 Maximum period 100 Communication device 141, 151 Generation unit 143, 153 Communication processing unit 200 Base station 241,251 Transmission processing unit 243, 253 Reception processing unit 245, 255 Control unit

Claims (15)

A generator (141) that generates channel state information by measurement based on a downlink reference signal, and
A communication processing unit (143) that transmits the timing information regarding the timing (25) at which the channel state information becomes valid and the channel state information by uplink, and
(100). The first aspect of the present invention, wherein when the communication processing unit receives an RRC (Radio Resource Control) message including configuration information for transmitting the timing information, the communication processing unit transmits the timing information by uplink according to the configuration information. Communication device. The communication device according to claim 1 or 2, wherein the communication processing unit transmits the timing information by uplink in response to receiving downlink control information including request information requesting transmission of the timing information. The communication device according to any one of claims 1 to 3, wherein the communication processing unit periodically transmits the timing information by uplink. The communication device according to any one of claims 1 to 4, wherein the timing information indicates the timing at which the channel state information becomes valid. The communication device according to claim 5, wherein the timing information indicates a period between the timing at which the channel state information becomes effective and another timing related to the channel state information. The communication device according to claim 6, wherein the other timing is a timing (23) at which the channel state information is transmitted by the uplink. The communication device according to any one of claims 5, wherein the timing information directly indicates the timing at which the channel state information becomes valid. The one according to any one of claims 1 to 8, wherein the communication processing unit transmits a set of the channel state information and the timing information on PUCCH (Physical Uplink Control Channel) or PUSCH (Physical Uplink Shared Channel). Communication device. The generator generates a plurality of channel state information corresponding to each of the plurality of timings by measurement based on the downlink reference signals transmitted at the plurality of timings.
The communication processing unit uploads the timing information regarding the timing at which each of the plurality of channel state information becomes valid, the timing information common to the plurality of channel state information, and the plurality of channel state information. Send by link,
The communication device according to any one of claims 1 to 7. The timing at which the channel state information becomes valid is the timing according to any one of claims 1 to 10, which is later than the timing (23) at which the channel state information is transmitted by the uplink by a predetermined minimum period (31) or more. The communication device described. The timing at which the channel state information becomes valid is any one of claims 1 to 11, wherein the timing is within a predetermined maximum period (33) from the timing (23) when the channel state information is transmitted by the uplink. The communication device described. A transmission processing unit (241) that transmits a downlink reference signal, and
The reception processing unit (243) that receives the channel state information generated by the measurement based on the downlink reference signal and the timing information regarding the timing (25) at which the channel state information becomes valid from the communication device (100). ,
Base station (200). Communication device (100)
A generation unit (151) that generates timing information regarding the timing (43) at which the measurement result based on the uplink reference signal transmitted by the communication device becomes valid, and
A communication processing unit (153) that transmits the timing information via an uplink,
A communication device equipped with. Reception processing unit (253) that receives the uplink reference signal transmitted by the communication device,
Equipped with
The reception processing unit receives from the communication device timing information regarding the timing (43) at which the measurement result based on the uplink reference signal becomes valid.
Base station (200).

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