Patent Application
20220182994
The present invention relates to a communication apparatus and a communication method in a radio communication system.
In Long Term Evolution (LTE), successor systems of LTE (for example, LTE Advanced (LTE-A), and New Radio (NR) (also called 5G)), technology of sidelink (device to device (D2D)) has been studied in which communication apparatuses, such as a user equipment (UE), perform communication directly with each other without going through a base station (for example, Non-Patent Document 1).
Furthermore, implementation of vehicle to everything (V2X) has been studied, and a specification has been developed. Here, V2X is a part of intelligent transport systems (ITS) and is a generic term of vehicle to vehicle (V2V) meaning a communication mode performed between vehicles, vehicle to infrastructure (V2I) meaning a communication mode performed between a vehicle and a road-side unit (RSU) installed on a road side, vehicle to nomadic device (V2N) meaning a communication mode performed between a vehicle and a mobile terminal of a driver, and vehicle to pedestrian (V2P) meaning a communication mode performed between a vehicle and a mobile terminal of a pedestrian as illustrated in
In a 3GPP RAN meeting, the agreement has been reached with respect to the following items, in regard to the SL transmission mode 2(d) specified in NR V2X. A user equipment transmits, to a base station (gNB), a notification of members of a group of the user equipment. The gNB provides, to each of units of the member user equipment within the group, a configuration of a dedicated resource pool and/or a configuration of a dedicated resource through the same user equipment. In this case, the member user equipment of the group need not be connected to the gNB. The user equipment is unable to modify the configuration provided by the gNB. For configuring the user equipment by the gNB, higher layer signaling is used. A physical layer signal is not to be used. This function depends on capability of the user equipment (UE capability).
For SL transmission mode 2(d), there is a need for clarifying an operation of each communication apparatus when a scheduling communication apparatus receives, from a base station, a configuration of a resource pool and/or information indicating a configuration of a resource, and the scheduling communication apparatus transmits, to each communication apparatus in the group, a notification of the configuration of the resource pool and/or the information indicating the configuration of the resource.
According to an aspect of the present invention, there is provided a communication apparatus including a receiving unit that receives information indicating a configuration of a resource pool via sidelink; a control unit that configures the resource pool based on the received information; and a transmitting unit that selects a transmission resource in the configured resource pool and that transmits a sidelink signal using the selected transmission resource.
According to an embodiment, for mode 2(d), an operation of each communication apparatus is clarified, in a case in which a scheduling communication apparatus transmits, to each communication apparatus in a group, information indicating a configuration of a resource pool.
Hereinafter, embodiments of the present invention are described with reference to the appended drawings. The embodiments described below are an example, and embodiments to which the present invention is applied are not limited to the following embodiments.
In the embodiments, it is assumed that a direct communication scheme between communication apparatuses is sidelink (SL) of LTE or NR, but the direct communication scheme is not limited to this scheme. Furthermore, the name “sidelink” is an example, and uplink (UL) may include a function of SL without using the name “sidelink.” The SL may be distinguished from downlink (DL) or UL by a difference in a frequency or time resource or may be another name.
Furthermore, UL and SL may be distinguished by a difference of one or more combinations of a time resource, a frequency resource, a time/frequency resource, a reference signal to be referred to so as to determine a path loss in transmission power control, and a reference signals (PSS/SSS/PSSS/SSSS) used for synchronization.
For example, in UL, a reference signal of an antenna port X is used as the reference signal to be referred to so as to determine the path loss in the transmission power control, and in SL (including UL used as SL), a reference signal of an antenna port Y is used as the reference signal to be referred to so as to determine the path loss in the transmission power control.
Furthermore, in the embodiments, a configuration in which a communication apparatus is installed in a vehicle is mainly assumed, but an embodiment of the present invention is not limited to this configuration. For example, a communication apparatus may be a terminal carried by a person, a communication apparatus may be a drone or a device installed in an aircraft, and a communication apparatus may be a base station, an RSU, a relay station (relay node), a user equipment provided with scheduling capability, or the like.
(Overview of Sidelink)
In the embodiment, since sidelink is a basic technique used here, first, an overview of sidelink is described as a basic example. An example of a technique described here is a technique specified in Rel. 14 of 3GPP or the like. This technique may be used in NR, or a technique different from this technique may be used in NR. A sidelink communication may be defined to be a direct communication performed among two or more neighboring units of user equipment by using E-UTRA technology, without going through a network node. A sidelink may be defined to be an interface between units of user equipment in a sidelink communication.
Sidelink is roughly divided into “discovery” and “communication.” For “discovery,” as illustrated in
For “communication,” as illustrated in
In Rel-14, in addition to the mode 1 and the mode 2, there are a mode 3 and a mode 4. In Rel-14, SCI and data can be transmitted simultaneously (in one sub frame) with resource blocks that are adjacent in a frequency direction. The SCI is also referred to as scheduling assignment (SA).
A channel used for “discovery” is referred to as a physical sidelink discovery channel (PSDCH), a channel for transmitting control information such as the SCI in “communication” is referred to as a physical sidelink control channel (PSCCH), and a channel for transmitting data is referred to as a physical sidelink shared channel (PSSCH). The PSCCH and the PSSCH have a PUSCH-based structure and have a structure in which a demodulation reference signal (DMRS) is inserted.
As illustrated in
As illustrated in
An example of a channel structure of LTE-V2X sidelink is illustrated in
A Primary Sidelink Synchronization signal (PSSS) and a secondary sidelink synchronization signal (SSSS) are used as synchronization signals for sidelink. For example, a physical sidelink broadcast channel (PSBCH) for transmitting broadcast information such as a system band of sidelink, a frame number, and resource configuration information is used for an operation outside a coverage. The PSSS/SSSS and the PSBCH are transmitted, for example, in one sub frame. The PSSS/SSSS is also referred to as an SLSS.
V2X assumed in the embodiments is a scheme related to “communication.” However, in the embodiments, there may be no distinction between “communication” and “discovery.” Furthermore, the technology according to the embodiments may be applied in “discovery.”
(System Configuration)
In
In the embodiments, the communication apparatus 20 is a device installed in a vehicle such as, for example, an automobile and has a cellular communication function as a UE in LTE or NR and a sidelink function. Furthermore, the communication apparatus 20 has a function of acquiring report information (position, event information, or the like) as in a GPS device, a camera, or various types of sensors. Furthermore, the communication apparatus 20 may be a general mobile terminal (such as a smartphone). Furthermore, the communication apparatus 20 may be an RSU. The RSU may be a UE type RSU having a function of a UE, a BS type RSU (which is also referred to as a gNB type UE) having a function of a base station, or a relay station.
The communication apparatus 20 need not be a device of one housing, and for example, even when various types of sensors are distributed and arranged in a vehicle, a device including various types of sensors is the communication apparatus 20. Furthermore, the communication apparatus 20 may have a function of performing transmission and reception of data with various types of sensors without including various types of sensors.
Furthermore, processing content of sidelink transmission of the communication apparatus is basically similar to processing content of UL transmission in LTE or NR. For example, the communication apparatus 20 scrambles and modulates codewords of transmission data, generates complex-valued symbols, maps the complex-valued symbols (transmission signals) to one or two layers, and performs precoding. Then, the precoded complex-valued symbols are mapped to resource elements, and a transmission signal (for example, CP-OFDM or a DFT-s-OFDM) is generated and transmitted from each antenna port.
The base station 10 has a cellular communication function as a base station 10 in LTE or NR and a function (for example, resource pool configuring, resource allocation, and the like) for enabling communication of the communication apparatus 20 in the embodiments. Furthermore, the base station 10 may be an RSU (a gNB type RSU), a relay station, or a communication apparatus provided with a scheduling function.
Furthermore, in the radio communication system according to the embodiments, a signal waveform used for SL or UL by the communication apparatus 20 may be an OFDMA, an SC-FDMA, or any other signal waveform. Furthermore, in the radio communication system according to the embodiments, as an example, a frame including a plurality of sub frames (for example, 10 sub frames) is formed in a time direction, and it includes a plurality of subcarriers in a frequency direction. One sub frame is an example of one transmission time interval (TTI). Here, the TTI is not necessarily a sub frame. For example, the TTI may be a slot, a mini-slot, or any other unit in the time domain.
Furthermore, the number of slots per sub frame may be determined in accordance with the subcarrier spacing. Furthermore, the number of symbols per slot may be 14 symbols.
In the embodiments, the communication apparatus 20 can operate in any mode among a mode 1 which is a mode in which resources are dynamically allocated by the ((enhanced) physical downlink control channel ((E) PDCCH) transmitted from the base station 10 to the communication apparatus, a mode 2 which is a mode in which the communication apparatus autonomously selects a transmission resource from a resource pool, a mode in which resource for SL signal transmission is allocated from the base station 10 (hereinafter referred to as a mode 3), and a mode in which a resource for SL signal transmission is autonomously selected (hereinafter referred to as a mode 4). The mode is configured, for example, in the communication apparatus 20 from the base station 10.
As illustrated in
(Overview of NR V2X)
In NR V2X, transmission modes are specified that are the same as SL transmission mode 3 and SL transmission mode 4 that are specified in LTE V2X.
In the following, an outline of transmission modes defined by NR V2X is described with reference to
Specifically, the communication apparatus 20 schedules transmission resources and assigns the transmission resources to the transmitting communication apparatus 20A. The communication apparatus 20A may perform a transmission to a receiving communication apparatus 20B by using the assigned communication resources. Namely, the communication apparatus 20 may control a transmission by another communication apparatus 20.
In the NR, as illustrated in
In a mode 2(d), the communication apparatus 20 that transmits SL scheduling information illustrated in
Here, for the mode 2(d), it is not yet specifically determined which information the communication apparatus 20 that transmits the SL scheduling information illustrated in
Here, in the 3GPP RAN meeting, the following items are agreed in regard to the mode 2(d).
The user equipment transmits, to the base station (gNB), a notification of members of the group of the user equipment. The gNB provides a configuration of a dedicated resource pool and/or a configuration of a dedicated resource to a member user equipment in the group through the same user equipment. In such a case, it is not necessary that the member user equipment of the group is connected to the gNB. The user equipment is unable to change the configuration provided by the gNB. In a case where the gNB configures the user equipment, higher layer signaling is used. A physical layer signal is not to be used. This function depends on capability of the user equipment (UE capability).
(Problem)
The details of the information indicating the configuration of the resource pool and/or the configuration of the resource, which is provided by the base station 10 and is provided by the scheduling communication apparatus 20 (S-UE) to each of the communication apparatuses 20 in the group are not determined yet. Furthermore, the details of the operation of the user equipment in the group that receives the information indicating the configuration of the resource pool and/or the configuration of the resource are not determined yet.
In the following, for the mode 2(d), an example of an operation (method) is described in a case where the scheduling communication apparatus 20 (S-UE) receives, from the base station 10, information indicating the configuration of the resource pool and/or the configuration of the resource to be transmitted to each communication apparatus 20 in the group.
(Option 1)
An option 1 is a method in which the configuration of the resource pool that is configured by the base station 10 is shared among the members of the group of the communication apparatuses 20. The limited resource pool that is shared in the limited members of the group of the communication apparatuses 20 is used, and, thus, the option 1 is advantageous in that control for preventing interference is easily performed. That is, each of the member communication apparatuses 20 of the group selects the resource by performing sensing in the assigned resource pool, and performs the transmission of a radio signal.
First, the base station 10 configures one or a plurality of resource pools to be shared in the group of the communication apparatuses 20. The base station 10 transmits a notification of the information indicating the configuration of one or a plurality of resource pools to the scheduling communication apparatus 20 in the group of the communication apparatuses 20. The scheduling communication apparatus 20 that receives the information indicating the configuration of the one or the plurality of resource pools transmits a notification of (relays) the information indicating the configuration of one or a plurality of resource pools to all the communication apparatuses 20 that are the members of the group of the communication apparatuses 20 or a part of the communication apparatuses 20 of all of the members of the group.
In a case where one or a plurality of resource pools are configured for the group of the communication apparatuses 20, the operation of any of a pattern 1, a pattern 2, and a pattern 3 described below may be assumed as the operation of the communication system including the base station 10, the scheduling communication apparatus 20, and the member communication apparatuses 20 of the group.
(Pattern 1)
The base station 10 explicitly configures, for the scheduling communication apparatus 20, as to which communication apparatus 20 the information indicating the configuration of which resource pool is to be notified. For example, in a case where the communication apparatus 20A, the communication apparatus 20B, a communication apparatus 20C, and a communication apparatus 20D are included in one group, the base station 10 may transmit, to the scheduling communication apparatus 20, an explicit instruction for causing the communication apparatus 20A and the communication apparatus 20B to use a resource pool 1 and for causing the communication apparatus 20C and the communication apparatus 20D to use a resource pool 2.
(Pattern 2)
The scheduling communication apparatus 20 determines as to which communication apparatus 20 the information indicating the configuration of which resource pool is to be transmitted, depending on the implementation of the scheduling communication apparatus 20.
(Pattern 3)
By using a higher layer parameter, the scheduling communication apparatus 20 is configured as to which pattern of the above-described pattern 1 and pattern 2 is to be used.
The scheduling communication apparatus 20 may configure an autonomous resource selection method to be executed in one or a plurality of resource pools for another communication apparatus 20.
For example, the scheduling communication apparatus 20 may specify, to the member communication apparatuses 20 of the group, granularity for selecting a resource and/or a resource pattern to be used in one or a plurality of resource pools. For example, the granularity of resource selection may be a resource selection window (in the resource pool) illustrated in
Alternatively, the granularity for selecting the resource and/or the resource pattern that is to be used by the member communication apparatus 20 of the group may be configured by the base station 10, and a notification of information indicating the granularity that is configured by the base station 10 may be transmitted to the scheduling communication apparatus 20. The scheduling communication apparatus 20 may transmit a notification of the received information indicating the granularity to the member communication apparatus 20 of the group.
Each of the communication apparatuses 20 may continuously perform a resource selection operation of a mode 2(a) or a mode 2(c) that is configured before the notification of the information indicating the configuration of one or a plurality of resource pools is transmitted from the scheduling communication apparatus 20, after the notification of the information indicating the configuration of one or a plurality of resource pools is transmitted from the scheduling communication apparatus 20.
In a case where the base station 10 transmits a notification of the information indicating the configuration of one or a plurality of resource pools to the scheduling communication apparatus 20, the notification may be made by higher layer signaling or physical layer signaling. For example, the base station 10 may transmit a notification of the information indicating the configuration of one or a plurality of resource pools by using a system information block (SIB), radio resource control (RRC) signaling, or downlink control information (DCI). That is, the scheduling communication apparatus 20 may receive the information indicating the configuration of one or a plurality of resource pools through the SIB/the RRC signaling/the DCI.
In a case where the scheduling communication apparatus 20 transmits a notification of the information indicating the configuration of one or a plurality of resource pools to another communication apparatus 20, the notification may be made by using the higher layer signaling or the physical layer signaling. For example, the scheduling communication apparatus 20 may transmit a notification of the information indicating the configuration of one or a plurality of resource pools to another communication apparatus 20, by using PC5-RRC (the RRC signaling on the sidelink) or sidelink control information (SCI). Here, the PC5-RRC is the higher layer signaling that is transmitted from a user equipment to another user equipment.
The configuration of one or a plurality of resource pools indicated by the information that is notified (relayed) by the base station 10 to the scheduling communication apparatus 20 and is notified by the scheduling communication apparatus to another communication apparatus 20 (that is, the configuration of the resource pool in the mode 2(d)) may be a configuration different from the configuration of another resource pool that is not relayed (the resource pool preconfigured in the modes 1, 2(a), 2(c), and the like), and may be distinguished based on the difference in the configurations. As described above, by distinguishing the configuration of the preconfigured resource pool from that of the resource pool in the mode 2(d), avoidance of a collision between the resource of mode 2(d) and the resource of another mode is assumed to be facilitated.
The communication apparatus 20 that receives the information indicating the configuration of one or a plurality of resource pools from the scheduling communication apparatus 20 is capable of selecting a resource of the physical sidelink control channel (PSCCH), a resource of the physical sidelink shared channel (PSSCH), or a resource of the physical sidelink feedback channel (PSFCH), in one or a plurality of resource pools, by using the configured resource selection method. Note that, in a case where the scheduling communication apparatus 20 does not configure the resource selection method for the communication apparatus 20, the communication apparatus 20 may autonomously determine the resource selection method.
(Option 2)
An option 2 is a method in which a dedicated resource pool (a resource pool that is orthogonal to another resource pool) is assigned to each of the member communication apparatuses 20 of the group. Accordingly, each of the communication apparatuses is capable of directly transmitting the radio signal by using the resource of the assigned resource pool, without performing sensing.
In the option 2, the base station 10 configures the dedicated resource pools for the communication apparatuses 20 in the group of the communication apparatuses 20. The base station 10 transmits, to the scheduling communication apparatus 20, a notification of information indicating the dedicated resource pools that are configured for the communication apparatuses 20 in the group of the communication apparatuses 20, and the scheduling communication apparatus 20 transmits, to each of the communication apparatuses 20, a notification of the information indicating the dedicated resource pool that is configured for the communication apparatus 20.
That is, a resource (or a resource pool) that is configured for a certain communication apparatus 20 of the group of the communication apparatuses 20 is orthogonal to a resource (or a resource pool) that is configured for another communication apparatus 20 of the group of the communication apparatuses 20.
In a case where the plurality of resource pools is configured for the group of the communication apparatuses 20, the operation of any of a pattern 1, a pattern 2, and a pattern 3 described below may be assumed.
(Pattern 1)
The base station 10 explicitly configures, for the scheduling communication apparatus 20, a notification of information indicating a configuration of which resource pool is to be transmitted to which communication apparatus 20.
(Pattern 2)
The scheduling communication apparatus 20 determines the communication apparatus 20 to which the notification of the information indicating the configuration of which resource pool is to be transmitted, depending on the implementation of the scheduling communication apparatus 20.
(Pattern 3)
By using a higher layer parameter, the scheduling communication apparatus 20 is configured with a pattern to be used between the above-described pattern 1 and pattern 2.
As described above, each of the communication apparatuses 20 in the group of the communication apparatuses 20 for which the dedicated resource pool is configured is capable of directly transmitting the radio signal without performing the sensing in the background, or the like. That is, the communication apparatus 20 does not perform the autonomous resource selection based on the sensing.
In addition, each of the communication apparatuses 20 of the group of the communication apparatuses 20 for which the dedicated resource pool is configured is capable of transmitting the signal of the PSCCH, the signal of the PSSCH, and/or the signal of the PSFCH through the resource of the configured dedicated resource pool.
In a case where the base station 10 transmits a notification of the information indicating the configuration of one or a plurality of resource pools to the scheduling communication apparatus 20, the notification may be performed by higher layer signaling or physical layer signaling. For example, the base station 10 may transmit a notification of the information indicating the configuration of one or a plurality of resource pools by the system information block (SIB), the radio resource control (RRC) signaling, or the downlink control information (DCI). That is, the scheduling communication apparatus 20 may receive the information indicating the configuration of one or a plurality of resource pools through the SIB/the RRC signaling/the DCI.
In a case where the scheduling communication apparatus 20 transmits a notification of the information indicating the configuration of one or a plurality of resource pools to another communication apparatus 20, the notification may be provided by sidelink higher layer signaling or sidelink physical layer signaling. For example, the scheduling communication apparatus 20 may transmit a notification of the information indicating the configuration of one or a plurality of resource pools to another communication apparatus 20 by using the PC5-RRC (the sidelink RRC signaling), or the sidelink control information (SCI).
(Option 3)
In an option 3, the option 1 and the option 2 are simultaneously used. The option 3 is classified into an option 3A and an option 3B described below. Here, in the case of the method of the option 1, it is considered that a certain extent of collision between resources occurs, but it is advantageous in that the resource can be efficiently used. In the case of the method of the option 2, collision between the resources can be avoided, but the resource that can be used is limited, and a large amount of resource may be consumed. The option 3 is a method in which the advantage of the option 1 and the advantage of the option 2 are combined.
(Option 3A)
The communication apparatus 20 to which the dedicated resource illustrated in
(Option 3B)
For an actual PSCCH transmission, an actual PSSCH transmission, and an actual PSFCH transmission that are reserved by the reservation signal and used, a resource selection is performed in a shared resource pool other than the hatched part in
The communication apparatus 20 receives the signal of the PSCCH, that is, receives the reservation signal, in the assigned dedicated resource.
Next, the communication apparatus 20 selects a resource for transmitting the signal of the PSCCH, the signal of the PSSCH, and/or the signal of the PSFCH, that is, a resource for transmitting data, by performing the sensing on one or a plurality of resources in the shared resource pool, which are reserved by the signal of the PSCCH received through the dedicated resource, that is, reserved by the reservation signal.
Note that, as SCI transmitted on PSCCH that is for decoding PSSCH, the SCI has been studied that is to be transmitted while being divided into two or three parts. In this case, for example, it has been studied to transmit the SCI in several steps, such as a case in which a simple instruction for reception regarding which resource is to be used is provided by a first part of the SCI and a detailed instruction for decoding is provided by a second part of the SCI. In such a case, additionally, a resource for transmitting a signal of the PSCCH may be selected.
A PSCCH resource for receiving a reservation signal may be associated with a resource for the corresponding data transmission, i.e., a resource for transmitting a PSCCH signal, a PSSCH signal, and a PSFCH signal.
The association between the PSCCH resource for receiving the reservation signal and the resource for the corresponding data transmission may be preconfigured. The scheduling communication apparatus 20 may receive information indicating the preconfigured association by decoding the SIB, the RRC signaling, the DCI, or the like that is received from the base station 10. The scheduling communication apparatus 20 may transmit a notification of the received information indicating the preconfigured association to the member communication apparatus 20 of the group. For providing the notification, the PC5-RRC or the SCI may be used.
Each of the member communication apparatuses 20 of the group is to perform blind decoding to receive a PSCCH in a resource for receiving a reservation signal, that is, in a resource orthogonal to those of the other member communication apparatuses 20 of the group. For example, in the example of
Note that, a resource pool of a dedicated PSCCH resource and a resource pool of a PSCCH resource that is additionally selected may be different resource pools. Alternatively, the resource pool of the dedicated PSCCH resource and the resource pool of the PSCCH resource that is additionally selected may be the same resource pool, as illustrated in the example of
In a case where the communication apparatus 20 in the group performs the autonomous resource selection, the scheduling communication apparatus 20 may transmit a notification of a dedicated resource of one communication apparatus 20 to all of the communication apparatuses 20 in the group, so that the dedicated resource is not selected. The notification may be provided by sidelink higher layer signaling or sidelink physical layer signaling. For example, the scheduling communication apparatus 20 may transmit a notification of information indicating the dedicated resource to another communication apparatus 20 by using the PC5-RRC or the SCI.
(Device Configuration)
Next, a functional configuration example of each of the base station 10 and the communication apparatus 20 that execute the processes and the operation described so far is described.
<Base Station 10>
The transmitting unit 101 has a function of generating a signal to be transmitted to the communication apparatus 20 side and transmitting the signal wirelessly. The receiving unit 102 has a function of receiving various types signals transmitted from the communication apparatus 20 and acquiring, for example, information of an upper layer from the received signals. Furthermore, the receiving unit 102 has a function of measuring the received signal and acquiring a quality value.
The configuration information management unit 103 stores pre-configured configuration information, configuration information received from the communication apparatus 20, and the like. Furthermore, configuration information related to transmission may be stored in the transmitting unit 101, and configuration information related to reception may be stored in the receiving unit 102. The control unit 104 controls the base station 10. The function of the control unit 104 related to transmission may be included in the transmitting unit 101, and the function of the control unit 104 related to reception may be included in the receiving unit 102.
For example, information indicating a configuration of a resource pool may be included in the configuration information management unit 103. For example, when a resource pool to be shared among the communication apparatuses 20 within a group is to be configured, the control unit 104 may read out information indicating a configuration of the resource pool to be configured from the configuration information management unit 103, and the control unit 104 may include the information in a signal to be transmitted by the transmitting unit 101. Furthermore, for example, when resource pools are individually configured for the communication apparatuses 20 within a group, the control unit 104 may read out from the configuration information management unit 103 information indicating the configurations of the resource pools to be individually configured for the communication apparatuses 20, and the control unit 104 may include the information in a signal to be transmitted by the transmitting unit 101.
<Communication Apparatus 20>
The transmitting unit 201 generates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiving unit 202 wirelessly receives various types of signals, and acquires a signal of an upper layer from the received signal of the physical layer. Furthermore, the receiving unit 202 has a function of measuring the received signal and acquiring a quality value.
The configuration information management unit 203 stores pre-configured configuration information, configuration information received from the base station 10, and the like. Furthermore, configuration information related to transmission may be stored in the transmitting unit 201, and configuration information related to reception may be stored in the receiving unit 202. The control unit 204 controls the communication apparatus 20. Furthermore, the function of the control unit 204 related to transmission may be included in the transmitting unit 201, and the function of the control unit 204 related to reception may be included in the receiving unit 202.
In a case where the communication apparatus 20 is the scheduling communication apparatus 20, the receiving unit 202 receives the information indicating the configuration of the resource pool that is configured by the base station for the communication apparatus 20 in the group by receiving a higher layer signal, such as the RRC signaling from the base station 10. In addition, in a case where the communication apparatus 20 is the communication apparatus 20 in the group, the receiving unit 202 receives the information indicating the configuration of the resource pool that is configured by the base station 10 for the communication apparatus 20 in the group by receiving the PC5-RRC (a sidelink RRC parameter), the sidelink control information (SCI), or the like that is transmitted from the scheduling communication apparatus 20. The control unit 204 configures the resource pool, based on the higher layer signal, the sidelink RRC parameter, or the SCI that is received by the receiving unit 202. In a case where the resource pool that is configured by the control unit 204 is the resource pool that is shared in the group of the communication apparatuses 20, the transmitting unit 201 selects a resource for transmitting the radio signal by performing the sensing, and transmits the radio signal by using the resource. In addition, in a case where the resource pool that is configured by the control unit 204 is the resource pool dedicated to the communication apparatus 20, the transmitting unit 201 directly selects the resource for transmitting the radio signal from the resource pool, and transmits the radio signal by using the selected resource.
In a case where the resource pool that is configured by the control unit 204 is a resource pool in which the resource pool that is shared in the group of the communication apparatuses 20 and the dedicated resource pools for the communication apparatuses 20 in the group are combined, the transmitting unit 201 directly selects the resource of the dedicated resource pool, without performing the sensing, provided that the resource of the dedicated resource pool can be used, and transmits the signal of the PSCCH, the signal of the PSSCH, and/or the signal of the PSFCH. Note that, in the dedicated resource pool, in a case where there is no suitable resource for transmitting the signal of the PSCCH, the signal of the PSSCH, and/or the signal of the PSFCH, the transmitting unit 201 selects the resource by performing the sensing in the shared resource pool, and transmits the signal of the PSCCH, the signal of the PSSCH, and/or the signal of the PSFCH by using the selected resource.
In a case where the resource pool that is configured by the control unit 204 is a resource pool in which the resource pool that is shared in the group of the communication apparatuses 20 and dedicated resource pools for the communication apparatuses 20 in the group to receive the reservation signal are combined, the receiving unit 202 receives the reservation signal (the signal of the PSCCH) by performing the blind decoding in the dedicated resource pool. Upon reception of the reservation signal by the receiving unit 202, the transmitting unit 201 selects the resource by performing the sensing on one or a plurality of resources that are reserved by the reservation signal in the shared resource pool, and transmits the signal of the PSCCH, the signal of the PSSCH, and/or the signal of the PSFCH, that is, transmits the data.
<Hardware Configuration>
The block diagrams (
For example, the communication apparatus and the base station 10 in an embodiment of the present invention may function as a computer for performing a process of the embodiments.
In the following description, the term “device” can be replaced with a circuit, device, unit, or the like. The hardware configuration of each of the communication apparatus 20 and the base station 10 may be configured to include one or more of devices represented by 1001 through 1006, which are depicted, or may be configured without including some devices.
Each function in each of the communication apparatus 20 and the base station 10 is implemented such that predetermined software (program) is read on hardware such as the processor 1001, the memory 1002 and the like, and the processor 1001 performs an operation and controls communication by the communication apparatus 1004 and at least one of reading and writing of data in the memory 1002 and the storage 1003.
For example, the processor 1001 operates an operating system and controls the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with a peripheral device, a control device, an operation device, a register, and the like. For example, the above-described baseband signal processing unit 104, the call control unit 105, and the like may be implemented by the processor 1001.
Furthermore, the processor 1001 reads a program (program code), a software module, data, or the like from at least one of the storage 1003 and the communication apparatus 1004 out to the memory 1002, and executes various types of processes according to them. A program causing a computer to execute at least some of the operations described in the above embodiments is used as the program. For example, the control unit 204 of the communication apparatus 20 may be implemented by a control program which is stored in the memory 1002 and operates on the processor 1001, and another functional block may be implemented similarly. Various types of processes are described to be executed by one processor 1001 but may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from a network via an electric communication line.
The memory 1002 is a computer readable recording medium and configured with at least one of a read only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), and the like. The memory 1002 may also be referred to as a “register,” a “cache,” a “main memory,” or the like. The memory 1002 can store programs (program codes), software modules, or the like which are executable for carrying out the radio communication method according to an embodiment of the present disclosure.
The storage 1003 is a computer-readable recording medium and may be configured with, for example, at least one of an optical disk such as a compact disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (for example, a compact disk, a digital versatile disk, or a Blu-ray (registered trademark) disc, a smart card, a flash memory (for example, a card, a stick, or a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The above-described storage medium may be, for example, a database, a server, or any other appropriate medium including at least one of the memory 1002 and the storage 1003.
The communication apparatus 1004 is hardware (a transmitting and receiving device) for performing communication between computers via at least one of a wired network and a wireless network and is also referred to as a “network device,” a “network controller,” a “network card,” a “communication module,” or the like. The communication apparatus 1004 may be configured to include a high frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).
The input device 1005 is an input device that receives an input from the outside (such as a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like). The output device 1006 is an output device that performs an output to the outside (for example, a display, a speaker, an LED lamp, or the like). The input device 1005 and the output device 1006 may be integrally configured (for example, a touch panel).
The devices such as the processor 1001 and the memory 1002 are connected by the bus 1007 to communicate information with each other. The bus 1007 may be configured with a single bus or may be configured with different buses between the devices.
Furthermore, each of the communication apparatus 20 and the base station 10 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP: Digital Signal Processor), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), or all or some of the functional blocks may be implemented by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware components.
In this specification, at least a communication apparatus and a communication method described below are disclosed.
A communication apparatus including a receiving unit that receives information indicating a configuration of a resource pool via sidelink; a control unit that configures the resource pool based on the received information; and a transmitting unit that selects a transmission resource in the configured resource pool and that transmits a sidelink signal using the selected transmission resource.
According to the above-described configuration, for the mode 2(d), after the scheduling communication apparatus transmits the information indicating the configuration of the resource pool to each communication device in the group, an operation of each communication apparatus is clarified.
The information received by the receiving unit may indicate the configuration of the resource pool that is shared among a plurality of communication apparatuses, and the transmitting unit may select the transmission resource by performing sensing in the resource pool that is shared. According to this configuration, collision of resources occurs in a certain extent, but it is advantageous in that the resource can be efficiently used.
The information received by the receiving unit may indicate the configuration of the resource pool dedicated to the communication apparatus, and the transmitting unit may select the transmission resource without performing sensing in the dedicated resource pool. According to this configuration, collision between resources can be avoided.
The information received by the receiving unit may indicate the configuration of the resource pool in which a resource pool shared among a plurality of communication apparatuses and resource pools dedicated to corresponding communication apparatuses of the plurality of communication apparatuses are combined, and, upon detecting that a resource of the resource pool dedicated to the communication apparatus is usable, the transmitting unit may select the usable resource as the transmission resource without performing sensing.
According to this configuration, an operation can be performed in which, in a case where the dedicated resource can be used, the resource is directly selected and a transmission is performed without performing the sensing, whereas in a case where the dedicated resource is not available, the communication is performed by performing the sensing.
The information received by the receiving unit may indicate the configuration of the resource pool in which a resource pool shared among a plurality of communication apparatuses and resource pools dedicated to corresponding communication apparatuses of the plurality of communication apparatuses are combined, the receiving unit may receive a reservation signal by performing blind decoding in the dedicated resource pool, and the transmitting unit may select the transmission resource by performing sensing on one or more resources reserved by the reservation signal in the shared resource pool. According to this configuration, a resource to be used can be reserved, so that the resource can be prevented from being used by another user.
A communication method executed by a communication apparatus, the method including receiving information indicating a configuration of a resource pool via sidelink; configuring the resource pool based on the received information; and selecting a transmission resource in the configured resource pool and transmitting a sidelink signal using the selected transmission resource.
The embodiments of the present invention are described above, but the disclosed invention is not limited to the above-described embodiments, and those skilled in the art would understand various modified examples, revised examples, alternative examples, substitution examples, and the like. In order to facilitate understanding of the invention, specific numerical value examples are used for description, but the numerical values are merely examples, and certain suitable values may be used unless otherwise stated. The classification of items in the above description is not essential to the present invention. Matters described in two or more items may be combined and used if necessary, and a matter described in one item may be applied to a matter described in another item (unless inconsistent). The boundary between functional units or processing units in a functional block diagram does not necessarily correspond to the boundary between physical parts. Operations of a plurality of functional units may be performed physically by one component, or an operation of one functional unit may be physically performed by a plurality of parts. In the processing procedure described in the embodiments, the order of the processes may be changed as long as there is no contradiction. For the sake of convenience of processing description, the communication apparatus and the base station 10 are described using the functional block diagrams, but such devices may be implemented by hardware, software, or a combination thereof. Software executed by the processor included in the communication apparatus 20 according to the embodiments of the present invention and software executed by the processor included in the base station 10 according to the embodiments of the present invention may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an EPROM, an EEPROM, a register, a hard disk (HDD), a removable disk, a CD-ROM, a database, a server, or any other appropriate storage medium.
Furthermore, a notification of information is not limited to the aspects or embodiments described in the present disclosure and may be provided by any other method. For example, the notification of information may be provided by physical layer signaling (for example, downlink control information (DCI) or uplink control information (UCI)), upper layer signaling (for example, radio resource control (RRC) signaling, medium access control (MAC) signaling, broadcast information (master information block (MIB), system information block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.
Each aspect and embodiment described in the present disclosure may be applied to at least one of Long Term Evolution (LTE), LTE-advanced (LTE-A), SUPER 3G, IMT-advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), new Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), a system using any other appropriate system, and next generation systems extended based on these standards. Furthermore, a plurality of systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may be combined to be applied.
The processing procedures, the sequences, the flowcharts, and the like of the respective aspects/embodiments described in the present disclosure may be reversed in order provided that there is no contradiction. For example, the method described in the present disclosure presents elements of various steps with an exemplary order and is not limited to a presented specific order.
In the present disclosure, a specific operation to be performed by the base station 10 may be performed by an upper node in some cases. In the network including one or more network nodes including the base station 10, various operations performed for communication with the terminal can be obviously performed by at least one of the base station 10 and any network node (for example, an MME, an S-GW, or the like is considered, but it is not limited thereto) other than the base station 10. A case is exemplified above in which there is one network node other than the base station 10. The one network node may be a combination of a plurality of other network nodes (e.g., MME and S-GW).
Input and output information and the like may be stored in a specific place (for example, a memory) or may be managed through a management table. Input and output information and the like may be overwritten, updated, or additionally written. Output information and the like may be deleted. Input information and the like may be transmitted to another device.
The determination may be performed in accordance with a value (0 or 1) indicated by one bit, may be performed in accordance with a Boolean value (Boolean: true or false), or may be performed by a comparison of numerical values (for example, a comparison with a predetermined value).
Each aspect/embodiment described in the present disclosure may be used alone, in combination, or may be switched in accordance with the execution. Further, notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information).
Software can be interpreted widely to mean a command, a command set, a code, a code segment, a program code, a program, a subprogram, a software module, an application, a software application, a software package, a routine, a subroutine, an object, an executable file, an execution thread, a procedure, a function, and the like regardless of whether software is called software, firmware, middleware, a microcode, a hardware description language, or any other name.
Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, when software is transmitted from a web site, a server, or any other remote source using a wired technology (such as a coaxial cable, a fiber optic cable, a twisted pair, or a digital subscriber line (DSL: Digital Subscriber Line)) and a radio technology (such as infrared rays or a microwave), at least one of the wired technology and the radio technology are included in a definition of a transmission medium.
Information, signals, and the like described in this disclosure may be indicated using any one of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like which are mentioned throughout the above description may be indicated by voltages, currents, electromagnetic waves, magnetic particles, optical fields or photons, or any combination thereof.
The terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal. Further, a signal may be a message.
The terms “system” and “network” used in the present disclosure are used interchangeably. Further, information, parameters, and the like described in the present disclosure may be indicated by absolute values, may be indicated by relative values from predetermined values, or may be indicated by corresponding other information. For example, radio resources may be those indicated by an index.
The names used for the above-described parameters are not limited in any respect. Further, mathematical formulas or the like using the parameters may be different from those explicitly disclosed in the present disclosure. Since various channels (for example, a PUCCH, a PDCCH, and the like) and information elements can be identified by suitable names, various names assigned to the various channels and the information elements are not limited in any respect.
In the present disclosure, the terms “base station (BS: Base Station),” “radio base station,” “fixed station,” “Node B,” “eNode B (eNB),” “gNodeB (gNB),” “access point,” “transmission point,” “reception point,” “transmission/reception point,” “cell,” “sector,” “cell group,” “carrier,” “component carrier,” and the like can be used interchangeably. The base stations may also be indicated by terms such as a macrocell, a small cell, a femtocell, and a picocell.
The base station eNB can accommodate one or more (for example, three) cells. In a case in which the base station accommodates a plurality of cells, the entire coverage area of the base station can be partitioned into a plurality of small areas, and each small area can provide a communication service through a base station subsystem (for example, a small indoor base station (a remote radio head (RRH)). The term “cell” or “sector” refers to the whole or a part of the coverage area of at least one of the base station and the base station subsystem that performs a communication service in the coverage.
In the present disclosure, the terms “mobile station (MS),” “user terminal,” “user equipment (UE),” “terminal,” and the like can be used interchangeably.
The mobile station may be referred to, by a person ordinarily skilled in the art, as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication apparatus, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable terms.
At least one of the base station and the mobile station may be also referred to as a transmitting device, a receiving device, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device installed in a mobile body, a mobile body itself, or the like. The mobile body may be a vehicle (for example, a car, an airplane, or the like), an unmanned body that moves (for example, a drone, an autonomous car or the like), or a robot (manned type or unmanned type). At least one of the base station and the mobile station includes a device which need not move during a communication operation. For example, at least one of the base station and the mobile station may be an Internet of things (IoT) device such as a sensor.
Further, the base station in the present disclosure may be replaced with a user terminal. For example, each aspect/embodiment of the present disclosure may be applied to a configuration in which communication between the base station and the user terminal is replaced with communication between a plurality of terminals (for example, which may be referred to as device-to-device (D2D) or vehicle-to-everything (V2X)). In this case, the user terminal may have the functions of the base station 10 described above. Further, the terms “uplink” and “downlink” may be replaced with terms (for example, “side”) corresponding to inter-terminal communication. For example, an uplink channel, a downlink channel, or the like may be replaced with side channels.
Similarly, the user terminal in the present disclosure may be replaced with the base station. In this case, the base station 10 may have the functions of the above-mentioned user terminal 20.
Terms “connected,” “coupled,” or variations thereof means any direct or indirect connection or coupling between two or more elements and may include the presence of one or more intermediate elements between two elements which are “connected” or “coupled.” The coupling or the connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.” In a case in which used in the present disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more electric wires, cables and/or a printed electrical connection or using electromagnetic energy having a wavelength in a radio frequency domain, a microwave region, or a light (both visible and invisible) region as non-limiting and non-exhaustive examples.
A reference signal may be abbreviated as RS and may be referred to as a pilot, depending on a standard to be applied.
A phrase “based on” used in the present disclosure is not limited to “based only on” unless otherwise stated. In other words, a phrase “based on” means both “based only on” and “based on at least.”
In a case in which “include,” “including,” and variations thereof are used in the present disclosure, these terms are intended to be comprehensive, similar to a term “provided with (comprising).” Further, the term “or” used in the present disclosure is intended not to be an exclusive OR.
In the present disclosure, for example, when an article such as “a,” “an,” or “the” in
English is added by a translation, the present disclosure may include a case in which a noun following the article is the plural.
In the present disclosure, a term “A and B are different” may mean “A and B are different from each other.” Furthermore, the term may mean “each of A and B is different from C.” Terms such as “separated,” “coupled,” or the like may also be interpreted in similarly to “different.”
Although the present invention is described above in detail, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the specification. The present invention may be implemented as revised and modified embodiments without departing from the gist and scope of the present invention as set forth in claims. Accordingly, the description of the specification is for the purpose of illustration and does not have any restrictive meaning to the present invention.
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2019/011010 | 3/15/2019 | WO | 00 |
