RU2791990C1 - Method and device for indication of feedback mode, method and device for determining feedback mode - Google Patents

Abstract

FIELD: communication technology.

SUBSTANCE: invention relates to the field of communication technology. To achieve the effect, the first device obtains configuration information that is used to indicate whether the first device supports the optional Hybrid Automatic Repeat Request (HARQ) feedback function. The first device transmits the SCI to the second device based on the configuration information. Here, the SCI includes the first SCI type and the second SCI type, and the first SCI type or the second SCI type contains a first field that is used to indicate the HARQ feedback mode for multicast data transmission.

EFFECT: providing flexible indication by using SCI direct connection control information and improving data transmission efficiency.

14 cl, 7 dwg

Description

FIELD OF TECHNOLOGY

The disclosure of the invention relates to the field of communication technology, and more specifically to a method and device for indicating the feedback mode, to a method and device for determining the feedback mode, and to an information carrier.

BACKGROUND OF THE INVENTION

Vehicle to Everything (V2X) technology, also known as the Internet of Vehicles technology, is a new generation of information and communication technology that allows vehicles to be connected to the environment. In this abbreviation, V (Vehicle) stands for a vehicle, and X stands for any object that interacts with a vehicle, such as another vehicle, people, roadside infrastructure and network, etc.

In a V2X system, devices can directly communicate with each other via a sidelink, and this mode of operation may be referred to as sidelink communication. Direct connection communication can be of various types: unicast, multicast, and broadcast. In the case of unicast and multicast communication, the receiving device after receiving the transmitted data is required to return a hybrid automatic repeat request (HARQ, Hybrid Automatic Repeat Request) to ensure normal data transmission.

SUMMARY OF THE INVENTION

Embodiments of the disclosure provide a method and apparatus for indicating a feedback mode, a method and apparatus for determining a feedback mode, and a storage medium that can determine how direct connection control information is used to indicate a HARQ feedback mode for multicast communication, in depending on whether the first device supports the optional HARQ function. The corresponding technical solution is described below.

In accordance with a first aspect of the embodiments of the disclosure, a feedback mode indication method applicable to a first device is provided. The method includes: a first device receiving configuration information that is configured to indicate whether the first device supports an optional hybrid automatic repeat request (HARQ) feedback function; and transmitting direct connection control information (SCI) by the first device to the second device based on the configuration information, wherein the SCI includes the first SCI type and the second SCI type, the first SCI type or the second SCI type contains a first field, and the first field is configured to indicate a mode HARQ feedback for multicast data transmission.

Alternatively, the configuration information indicates that the first device supports the optional HARQ feedback function and the first SCI type contains the first field; or the configuration information indicates that the device does not support the optional HARQ feedback function and the second SCI type contains the first field.

Alternatively, the first SCI type contains a first field, and the first field also indicates the format of the second SCI type.

Alternatively, the different HARQ feedback modes for SCI-associated multicast data transmission correspond to different formats of the second SCI type and different values of the first field.

Alternatively, the first field contains four values corresponding to the four formats of the second SCI type, respectively. The four formats of the second SCI type correspond to broadcast communication, unicast communication, multicast communication based on HARQ feedback mode 1, and multicast communication based on HARQ feedback mode 2, respectively. Alternatively, the first field contains three values corresponding to the three formats of the second SCI type, respectively. The three formats of the second SCI type correspond to broadcast communication, multicast communication based on HARQ feedback mode 1, unicast communication and multicast communication based on HARQ feedback mode 2, respectively.

Alternatively, the second SCI type contains a first field, and the first SCI type or the second SCI type contains a second field. The second field specifies the link type of the direct connection.

Alternatively, the configuration information is information received by the first device and transmitted by the network access device, or information pre-configured in the first device.

Alternatively, the optional function is to perform HARQ feedback according to the distance between the receiving side and the transmitting side.

In accordance with a second aspect of the embodiments of the disclosure, a method for determining a feedback mode applicable to a second device is provided. The method includes: receiving by the second device direct connection control information (SCI) transmitted by the first device, wherein the SCI includes a first SCI type and a second SCI type, the first SCI type or the second SCI type contains a first field, and the first field is configured to indicate a feedback mode hybrid automatic repeat request (HARQ) for multicast data transmission; and determining by the second device a HARQ feedback mode for transmitting data in multicast communication associated with SCI based on the configuration information and the first SCI field, the configuration information being configured to indicate whether the second device supports an optional HARQ feedback function.

Alternatively, the first SCI type contains a first field, and the first field also indicates the format of the second SCI type.

Alternatively, the different HARQ feedback modes for SCI-associated multicast data transmission correspond to different formats of the second SCI type and different values of the first field.

Alternatively, the first field contains four values corresponding to the four formats of the second SCI type, respectively. The four formats of the second SCI type correspond to broadcast communication, unicast communication, multicast communication based on HARQ feedback mode 1, and multicast communication based on HARQ feedback mode 2, respectively. Alternatively, the first field contains three values corresponding to the three formats of the second SCI type, respectively. The three formats of the second SCI type correspond to broadcast communication, multicast communication based on HARQ feedback mode 1, unicast communication and multicast communication based on HARQ feedback mode 2, respectively.

Alternatively, the second device's determination of the HARQ feedback mode for multicast communication based on SCI and configuration information includes:

if the configuration information indicates that the second device supports the optional HARQ feedback function, determining the format of the second SCI type and the corresponding HARQ feedback mode for multicast communication based on the value of the first field in the first SCI type; or

if the configuration information indicates that the second device supports the optional HARQ feedback function, and there are time-frequency resources for transmitting the HARQ feedback information in the direct connection communication resource pool, determining the format of the second SCI type and the corresponding HARQ feedback mode for the multicast communications based on the first field in the first SCI type; or

if the configuration information indicates that the second device does not support the optional HARQ feedback function, or there are no time-frequency resources for transmitting HARQ feedback information in the direct connection communication resource pool, determining the multicast HARQ feedback mode based on the first field in the second type of SCI.

Alternatively, the second SCI type contains a first field, and the first SCI type or the second SCI type contains a second field. The second field specifies the link type of the direct connection.

Alternatively, the configuration information is information received by the second device and transmitted by the network access device, or information pre-configured in the second device.

Alternatively, the optional function is to perform HARQ feedback according to the distance between the receiving side and the transmitting side.

According to a third aspect of the embodiments of the invention, there is provided a device for indicating a feedback mode applicable to the first device. The device contains an information acquisition module and a transmission module. The information obtaining module is configured to obtain configuration information configured to indicate whether the first device supports an optional hybrid automatic repeat request (HARQ) feedback function. The transmission module is configured to transmit direct connection control information (SCI) to the second device based on the configuration information. The SCI includes a first SCI type and a second SCI type, the first SCI type or the second SCI type contains a first field, and the first field is configured to indicate a HARQ feedback mode for multicast data transmission.

According to a fourth aspect of the embodiments of the invention, there is provided an apparatus for determining a feedback mode applicable to a second apparatus. The device contains a receiving module and a determination module. The receiving module is configured to receive direct connection control information (SCI) transmitted by the first device. The SCI includes a first SCI type and a second SCI type, the first SCI type or the second SCI type contains a first field, and the first field is configured to indicate a hybrid automatic repeat request (HARQ) feedback mode for multicast data transmission. The determining module is configured to determine the HARQ feedback mode for data transmission in multicast communication associated with the SCI based on the configuration information and the first field in the SCI. The configuration information is configured to indicate whether the second device supports the optional HARQ feedback function.

Alternatively, the determination module is configured to perform the following operations:

if the configuration information indicates that the second device supports the optional HARQ feedback function, determining the format of the second SCI type and the HARQ feedback mode for multicast communication based on the value of the first field in the first SCI type; or

if the configuration information indicates that the second device supports the optional HARQ feedback function, and there are time-frequency resources for transmitting the HARQ feedback information in the direct connection communication resource pool, determining the format of the second SCI type and the HARQ feedback mode for multicast communication based on the first field in the first SCI type; or

if the configuration information indicates that the second device does not support the optional HARQ feedback function, or there are no time-frequency resources for transmitting HARQ feedback information in the direct connection communication resource pool, determining the multicast HARQ feedback mode based on the first field in the second type of SCI.

According to a fifth aspect of the embodiments of the invention, a device is provided for indicating a feedback mode. The device contains: a processor and a memory that stores instructions executed by the processor. When loading and executing executable instructions, the processor implements a feedback indication method in accordance with any of the variants of the first aspect.

According to a sixth aspect of the embodiments of the invention, an apparatus is provided for determining a feedback mode. The device contains a processor and a memory that stores instructions to be executed by the processor. When loading and executing executable instructions, the processor implements a feedback determination method in accordance with any of the variants of the second aspect.

According to a seventh aspect of the embodiments of the invention, a computer-readable medium is provided. If an instruction stored on a computer-readable medium is executed by a processor, the feedback mode indication method described according to the first aspect or the feedback mode determination method described according to the second aspect may be executed.

By implementing the technical solutions according to the embodiments of the invention, the following positive results can be achieved: according to the embodiment of the invention, according to the configuration information indicating whether the first device supports the optional HARQ feedback function, the first device selects the first SCI type or the second SCI type to apply. SCI to carry the first field indicating the HARQ feedback mode for multicast data transmission. This display method is flexible. The second device can accurately determine the multicast feedback mode according to the configuration information for indicating whether the second device supports the optional HARQ feedback function and the first field in the SCI.

It should be appreciated that the foregoing general description and the following detailed description are provided by way of example and explanation of the invention only, and are not intended to limit the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included in and form part of this specification, illustrate embodiments that are consistent with the disclosure of the invention and, together with the description, help to understand the principles of the disclosure.

In FIG. 1 is a block diagram of a network architecture in accordance with an exemplary disclosure.

In FIG. 2 shows a flowchart of the feedback mode indication method in accordance with the exemplary embodiment.

In FIG. 3 shows the flow of the method for determining the feedback mode according to the exemplary embodiment.

In FIG. 4 is a schematic diagram showing the flow of interaction between the feedback mode indication method and the feedback mode determination method according to the embodiment.

In FIG. 5 shows a block diagram of a device for indicating a feedback mode in accordance with an embodiment.

In FIG. 6 is a block diagram of an apparatus for determining a feedback mode according to an embodiment.

In FIG. 7 shows a block diagram of an apparatus for indicating or determining a feedback mode, in accordance with an embodiment.

DETAILED DESCRIPTION

The following describes in more detail embodiments of the invention, illustrated by means of the accompanying drawings. When reference is made to the drawings in the following description, like reference numerals in the various drawings denote the same or like elements, unless expressly indicated otherwise. The exemplary embodiments set forth in the following description do not cover all embodiments that do not conflict with the embodiments of the disclosure. On the contrary, this description provides only examples of the implementation of devices and methods corresponding to some aspects of the variants of the disclosure of the invention, the essence of which is set forth in the attached claims.

By implementing the technical solutions according to the embodiments of the invention, the following positive results can be achieved: According to the embodiments of the invention, according to the configuration information indicating whether the first device supports the optional HARQ feedback function, the first device selects the first SCI type or the second SCI type to apply. SCI to carry the first field indicating the HARQ feedback mode for multicast data transmission. This display method is flexible. The second device can accurately determine the multicast feedback mode according to the configuration information for indicating whether the second device supports the optional HARQ feedback function and the first field in the SCI.

In the current multicast environment, two HARQ feedback modes are supported, and the transmitter requires Sidelink Control Information (SCI) to indicate to the receiver which feedback mode is used to return HARQ.

In the current state of the art, interaction information modes according to the V2X protocol include: vehicle to vehicle interaction mode (V2V, Vehicle to Vehicle), vehicle to infrastructure interaction mode (V2I, Vehicle to Infrastructure), vehicle to pedestrian interaction mode (V2P , Vehicle to Pedestrian), vehicle interaction mode with the network (V2N, Vehicle to Network).

In FIG. 1 is a block diagram of a network architecture in accordance with an embodiment of the disclosure. The network architecture is described on the example of a long-term evolution system (LTE, Long Term Evolution). As shown in FIG. 1, the network architecture may contain: an advanced packet data core 11 (EPC, Evolved Packet Core), an advanced UMTS terrestrial radio access network 12 (E-UTRAN, Evolved UMTS Terrestrial Radio Access Network), a roadside unit 13 (RSU, Road Side Unit ), vehicle 14 and terminal 15.

EPC 11 is the core network in the LTE system. The core network contains multiple core network devices. The functions of the core network devices are mainly to establish a connection with a user, administer users, provide data transfer services, and maintain an interface with an external network serving as a data transfer network. For example, EPC 11 contains a Mobility Management Entity (MME), a Serving Gateway (S-GW), and a PDN Gateway (P-GW, PDN Gateway). E-UTRAN 12 is an access network of an LTE system. The access network contains several network access devices. The network access device may be a base station (BS, Base Station) placed in the access network to provide the terminal 15 with a wireless communication function. The base station may include various kinds of macro base stations, micro base stations, repeaters, access points, and so on. In a system using different radio access technologies, devices that perform the functions of a base station may be called differently. For example, in LTE systems, devices that perform the functions of a base station are called eNodeBs or eNBs. In 5G New Radio Technology (NR, New Radio) systems, devices that perform the functions of a base station are called gNodeBs or gNBs.

The terminal 15 may include various devices that perform wireless communication functions, such as portable devices, vehicle-mounted devices, wearable devices, computing devices, other processing devices connected to a wireless modem, as well as various types of user equipment (UE, User Equipment ), mobile stations (MS, Mobile Station), end devices, etc. For convenience of description, the above devices are collectively referred to as terminals. The network access devices communicate with the core network devices through some air interface technology such as the S1 interface. The network access devices also communicate with the terminal 15 via some air interface technology such as the Uu interface. The Uu interface is the interface between the UE and the UTRAN. Interfaces S1 and Uu are known in the art of radio interfaces.

The RSU 13 may include a microwave reader/writer and a controller. The RSU 13 is used to receive information reported by the vehicle 14 and transmit traffic information to the vehicle 14. The RSU 13 is equipped with data storage and processing facilities, and can quickly and accurately detect traffic information such as road conditions and traffic conditions, process traffic information, and then transmit the processed traffic information to the vehicle 14. RSU13 can communicate with the network access device using some radio interface technology such as Uu interface.

Vehicle 14 may be an autonomous vehicle or a non-autonomous vehicle. The vehicle 14 is equipped with a vehicle-mounted communication device through which the vehicle 14 communicates with other vehicles, the terminal 15, or other devices such as the RSU 13. The vehicle-mounted communication device may be a device integrated into the unit. vehicle-mounted communication device (e.g. Telematics B0X, T-B0X) or a device separate from the vehicle itself. In addition, the vehicle-mounted communication device may be integrated into the vehicle 14 at the factory or outside the manufacturer. The communication device mounted on the vehicle 14 may communicate with the terminal 15 via a direct connection communication interface (eg, a PC5 interface). For example, terminal 15 transmits its location information to vehicle 14 via a PC5 interface. Vehicle mounted communication device 14 may communicate with RSU 13 via a direct connection communication interface (eg, a PC5 interface). For example, RSU 13 transmits traffic status information on a remote track to vehicle 14 via a PC5 interface. In addition, the communication device mounted on the vehicle 14 may communicate with a network access device (eg, an eNB in an LTE system) using some radio interface technology, such as a Uu interface.

The communication system shown in Fig. 1 may implement a V2X service scenario, and may also include devices such as a V2X application server and a V2X control function node, which are not limited to this embodiment.

Note that, as an example for describing the communication system shown in FIG. 1 shows an LTE system. The technical solutions described in the disclosure of the invention can be applied in the LTE system or in other wireless communication systems using various wireless access technologies, for example, in systems using such access technologies as (CDMA, Code Division Multiple Access), multiple access with division Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency-Division Multiple Access (OFDMA), Frequency Division Multiple Access and single carrier (SC-FDMA, Single Carrier FDMA). In addition, the technical solutions can also be applied to an advanced LTE system such as a new generation network system, that is, a 5th generation (5G) system, and the like. In addition, the terms "network" and "system" are often used interchangeably when describing embodiments of the invention, but those skilled in the art can understand their meaning.

The communication systems and service scenarios presented in the description of the embodiments of the invention serve to more clearly illustrate the technical solutions and are not intended to limit these solutions to only the indicated variants. As new business scenarios develop and new service scenarios emerge, the technical solutions corresponding to the embodiments of the invention are also applicable to solving related technical problems.

In the current state of the art, if direct connection communication is used between two devices, the transmitter needs to send direct connection control information (SCI) to the receiver in order to ensure normal reception and successful demodulation of data by the receiver. The direct connection control information includes a first SCI type and a second SCI type. The first type of SCI may also be referred to as the first part of the SCI or the first stage of the SCI. Accordingly, the second type of SCI may also be referred to as the second part of the SCI or the second stage of the SCI.

The receiver needs to demodulate the first SCI type, and determine the format and size of the second SCI type, and the location and size of the time-frequency resources occupied by the second SCI type according to the information contained in the first SCI type, and demodulate the second SCI type.

Direct connection communication can be of the following types: unicast, multicast, and broadcast. In the case of unicast and multicast communication, the receiving device, after receiving the data transmitted by the transmitting device, needs to ensure that the data is correctly transmitted based on the HARQ feedback.

In the case of unicast communication, the receiving device returns acknowledgment information (ACK, ACKnowledge) if data reception is successful, or negative acknowledgment information (NACK, Non-ACKnowledge) if a reception failure occurs.

In the case of multicast, two different HARQ feedback modes are defined, namely HARQ feedback mode 1 and HARQ feedback mode 2. In HARQ feedback mode 1, a multicast receiver returns NACK information when the data demodulation process fails, and does not return information otherwise. In HARQ feedback mode 2, a multicast receiver returns ACK information if data reception is successful, and returns NACK information if a reception failure occurs.

In the case of a multicast device, the transmitter requires SCI to indicate to the receiver which HARQ feedback mode is being used. In the state of the art, the HARQ feedback mode may be indicated by setting the appropriate field in the first or second SCI type. This method of indicating by fixed use of the first SCI type or the second SCI type is not flexible enough.

In FIG. 2 shows a flowchart of the feedback mode indication method according to the embodiment. The method may be performed by the first device. For example, the first device may be the terminal shown in FIG. 1, a communication device installed on a vehicle. In accordance with FIG. 2, this method contains steps 201 and 202.

In step 201, the first device receives configuration information configured to indicate whether the first device supports the optional HARQ feedback function.

In step 202, the first device sends Direct Connect Control Information (SCI) to the second device based on the configuration information. The SCI includes a first SCI type and a second SCI type, and the first SCI type or the second SCI type comprises a first field, the first field being configured to indicate a HARQ feedback mode for multicast data transmission.

Alternatively, the configuration information indicates that the first device supports the optional HARQ feedback function and the first SCI type contains the first field; or the configuration information indicates that the device does not support the optional HARQ feedback function and the second SCI type contains the first field.

Alternatively, the first SCI type contains a first field, and the first field also indicates the format of the second SCI type.

Alternatively, the different HARQ feedback modes for SCI-associated multicast data transmission correspond to different formats of the second SCI type and different values of the first field.

Alternatively, the first field contains four values corresponding to the four formats of the second SCI type, respectively. The four formats of the second SCI type correspond to broadcast communication, unicast communication, multicast communication based on HARQ feedback mode 1, and multicast communication based on HARQ feedback mode 2, respectively. Alternatively, the first field contains three values corresponding to the three formats of the second SCI type, respectively. The three formats of the second SCI type correspond to broadcast communication, multicast communication based on HARQ feedback mode 1, unicast communication and multicast communication based on HARQ feedback mode 2, respectively.

Alternatively, the second SCI type contains a first field, and the first SCI type or the second SCI type contains a second field. The second field specifies the link type of the direct connection.

Alternatively, the configuration information is information received by the first device and transmitted by the network access device, or information pre-configured in the first device.

Alternatively, the optional function is to perform HARQ feedback according to the distance between the receiving side and the transmitting side.

It should be noted that the above steps 201-202 can be combined arbitrarily with the above alternative steps.

In FIG. 3 shows a flowchart of a method for determining a feedback mode according to an embodiment. The method may be performed by a second device. For example, the second device may be the terminal shown in FIG. 1, or a communication device installed on the vehicle. In accordance with FIG. Method 3 contains steps 301 and 302.

In step 301, the second device receives direct connection control information (SCI) transmitted by the first device. The SCI includes a first SCI type and a second SCI type, and the first SCI type or the second SCI type comprises a first field, the first field being configured to indicate a hybrid automatic repeat request (HARQ) feedback mode for multicast data transmission.

In step 302, the second device determines the SCI-associated HARQ feedback mode for multicast data transmission based on the configuration information and the first field in the SCI. The configuration information is configured to indicate whether the second device supports the optional HARQ feedback function.

Alternatively, the first SCI type contains a first field, and the first field also indicates the format of the second SCI type.

Alternatively, the different HARQ feedback modes for SCI-associated multicast data transmission correspond to different formats of the second SCI type and different values of the first field.

Alternatively, the first field contains four values corresponding to the four formats of the second SCI type, respectively. The four formats of the second SCI type correspond to broadcast communication, unicast communication, multicast communication based on HARQ feedback mode 1, and multicast communication based on HARQ feedback mode 2, respectively. Alternatively, the first field contains three values corresponding to the three formats of the second SCI type, respectively. The three formats of the second SCI type correspond to broadcast communication, multicast communication based on HARQ feedback mode 1, unicast communication and multicast communication based on HARQ feedback mode 2, respectively.

Alternatively, determining the HARQ feedback mode for multicast communication based on SCI and configuration information by the second device includes performing the following steps:

if the configuration information indicates that the second device supports the optional HARQ feedback function, determining the format of the second SCI type and the corresponding HARQ feedback mode for multicast communication based on the value of the first field in the first SCI type; or

if the configuration information indicates that the second device supports the optional HARQ feedback function, and there are time-frequency resources for transmitting the HARQ feedback information in the direct connection communication resource pool, determining the format of the second SCI type and the corresponding HARQ feedback mode for the multicast communications based on the first field in the first SCI type; or

if the configuration information indicates that the second device does not support the optional HARQ feedback function, or there are no time-frequency resources for transmitting HARQ feedback information in the direct connection communication resource pool, determining the multicast HARQ feedback mode based on the first field in the second type of SCI.

Alternatively, the second SCI type contains a first field, and the first SCI type or the second SCI type contains a second field. The second field specifies the link type of the direct connection.

Alternatively, the configuration information is information received by the second device and transmitted by the network access device, or information pre-configured in the second device.

Alternatively, the optional function is to perform HARQ feedback according to the distance between the receiving side and the transmitting side.

It should be noted that the above steps 301-302 can be combined arbitrarily with the above alternative steps.

In FIG. 4 shows a flowchart of a method for indicating and determining a feedback mode according to an embodiment. The method may be performed jointly by the first device and the second device. For example, the first device may be the terminal shown in FIG. 1 or a communication device mounted on a vehicle, the second device may also be the terminal shown in FIG. 1, or a communication device installed on the vehicle. In FIG. 4 shows that the method includes steps 401-404, described below.

At step 401, the first device receives the configuration information.

The configuration information is configured to indicate whether the first device supports the optional HARQ feedback function. According to an embodiment of the disclosure, the optional HARQ feedback function may be a function of performing HARQ feedback according to conditions other than successful data transmission and unsuccessful data transmission. For example, an optional function may be designed to perform HARQ feedback according to the distance between the receiving side and the transmitting side.

According to an exemplary implementation, the configuration information may be information received by the first device and transmitted by the network access device. After receiving the configuration information, the first device may store the configuration information in the local storage and read the configuration information from the local storage if the configuration information is to be used later. That is, the optional HARQ feedback function can be enabled or disabled by the network access device.

According to another possible implementation, the configuration information may be pre-configured in the first device. The optional HARQ feedback function can also be enabled and disabled according to pre-configured configuration information.

Alternatively, if the first device is within coverage of a cellular network, the first device may receive the downlink signaling transmitted by the network access device and obtain the configuration information contained in the downlink signaling; if the first device is out of coverage of the cellular network, the configuration information pre-configured in the terminal can be obtained.

In step 402, the first device sends Direct Connect Control Information (SCI) to the second device based on the configuration information.

According to an embodiment of the disclosure, the SCI includes a first SCI type and a second SCI type, and the first SCI type or the second SCI type comprises a first field, the first field being configured to indicate a HARQ feedback mode for multicast data transmission.

Alternatively, the configuration information indicates that the first device supports the optional HARQ feedback function and the first SCI type contains the first field; or the configuration information indicates that the device does not support the optional HARQ feedback function and the second SCI type contains the first field.

Accordingly, at step 402, the following operations may be performed: if the configuration information indicates that the first device supports the optional HARQ feedback function, the first SCI type and the second SCI type are transmitted, and the first SCI type contains the first field; or if the configuration information indicates that the first device does not support the optional HARQ feedback function, the first SCI type and the second SCI type are transmitted, with the second SCI type containing the first field.

In an exemplary implementation, if the first SCI type contains a first field, then the first field may be a newly added field. For example, the new added field may be 1 bit long, and the new added field may contain two values corresponding to two multicast feedback modes.

According to another possible implementation, if the first SCI type contains a first field, then existing fields in the first SCI type (ie, fields containing other information) may be defined as the first field. For example, a field for format indication of the second SCI type is defined as the first field. In other words, the first field may also be configured to indicate the format of the second SCI type.

According to an embodiment of the invention, if the first device supports the optional HARQ feedback function, then if the first device notifies the second device to perform HARQ feedback in mode 1, the field corresponding to the optional function may be carried in the second SCI type; if the first device notifies the second device to perform HARQ feedback in mode 2, the field that corresponds to the optional function may not be carried in the second SCI type.

For example, if the first device supports an optional HARQ feedback function according to the distance between the receiving side and the transmitting side, then the second SCI type contains fields for indicating the geographical location of the transmitting side UE and a transmission distance threshold. The receiving side determines the distance between the transmitting and receiving side according to its own geographical location, and compares the determined distance with a threshold value of the transmission distance. If the determined distance is less than the transmission distance threshold, HARQ feedback is performed. If the determined distance is not less than the transmission threshold, no HARQ feedback is performed. If the first device does not support the optional HARQ feedback function based on the distance between the receiving side and the transmitting side, then the second SCI type does not contain a field for indicating the geographical location of the transmitting side UE and a transmission distance threshold.

Thus, for different direct connection feedback modes, the format and size of the second type of SCI differ greatly. That is, if the device supports the optional HARQ feedback function, the multicast feedback mode may affect the format of the second SCI type. Since different direct connection types may correspond to different formats and sizes of the second SCI type, the formats and sizes of the second SCI type also vary greatly for different types (including unicast, multicast and broadcast) of the direct connection.

When the formats and sizes of the second SCI type differ significantly, it is required to include a field in the first SCI type data to indicate the format of the second SCI type in order to ensure that the data is correctly demodulated by the second device. Under these circumstances, the field for indicating the format of the second SCI type may be multiplexed into the first field in such a way as to reduce the size of the first SCI type. Therefore, the second device needs to first demodulate the first SCI type, then demodulate the second SCI type according to the information contained in the first SCI type, and then demodulate the data according to the second SCI type. Devices other than the first and second devices also need to demodulate at least the first SCI type for a discovery process to select resources. Thus, the information in the first SCI type is more important, and the smaller amount of data in the first SCI type helps to improve data transmission efficiency. At the same time, including the first field in the first SCI type and not in the second SCI type can eliminate the redundancy of useless information fields appearing in the second SCI type, which can advantageously improve data transmission efficiency.

According to this disclosure, the SCI format may mean the number of fields included in the SCI and their content, the length of each field, and the order of the fields.

In case the first field can also be configured to indicate the format of the second SCI type, the different HARQ feedback modes for transmitting data in multicast associated with the SCI transmitted by the first device correspond to different formats of the second SCI type and different values of the first field.

In an exemplary implementation, the first field contains four values corresponding to the four formats of the second SCI type, respectively. The four formats of the second SCI type correspond to broadcast communication, unicast communication, multicast communication based on HARQ feedback mode 1, and multicast communication based on HARQ feedback mode 2, respectively. According to this embodiment, the length of the first field may be 2 bits, which corresponds to four values: 00, 01, 10, and 11.

According to another possible implementation, the first field contains three values corresponding to the three formats of the second SCI type, respectively. The three formats of the second SCI type correspond to broadcast communication, multicast communication based on HARQ feedback mode 1, unicast communication and multicast communication based on HARQ feedback mode 2, respectively. According to this embodiment, the first field may be 2 bits long, corresponding to the values: 00, 01, 10, and 11, and the remaining one value may be reserved or used to indicate other information.

If the first device does not support the optional HARQ feedback function, then the feedback mode used is not important and the fields related to the optional function need not be included. Thus, the formats and sizes of the second SCI type that correspond to different feedback modes are relatively compatible, and the formats and sizes of the second SCI type corresponding to unicast and multicast are also relatively compatible. In this case, the first field may be carried in the second SCI type to reduce the size of the first SCI type.

For example, in the second type of SCI, the length of the first field may be 1 bit. In the first field, two values are written corresponding to multicast transmission based on feedback mode 1 and multicast transmission based on feedback mode 2.

Alternatively, if the second SCI type contains a first field, the first SCI type or the second SCI type contains a second field, where the second field is configured to indicate the type of connection of the direct connection.

According to an exemplary implementation, the first SCI type contains a second field, the second field may be 1 bit long, and the second field may contain two values corresponding to a broadcast and a non-broadcast connection. The second device may determine the direct connection link type according to the second field and then determine the format of the second SCI type. Compared with the first type of SCI containing the first field, the size of the first type of SCI containing the second field is relatively small, which also improves transmission efficiency.

In this case, communication other than broadcast includes multicast communication and unicast communication. The second device can also distinguish multicast communication from unicast communication using the target physical layer identifier and/or the area of the source physical layer identifier in the second type of SCI. The second type of SCI contains a third field to indicate the type of communication other than broadcast (ie, unicast and multicast). The length of the third field may be 1 bit. The second device can distinguish between unicast and multicast communications using the value of the third field.

During unicast communication, the 1 bit corresponding to the second field in the first SCI type may be invalid, null, or used to indicate other information.

According to this disclosure, the first type of SCI may be transmitted on a Physical Sidelink Control Channel (PSCCH). The second type of SCI may be transmitted on a Physical Sidelink Shared Channel (PSSCH) and demodulated using a Demodulation Reference Signal (DMRS) on the PSSCH.

In step 403, the second device receives the SCI transmitted by the first device.

An appropriate description of the SCI can be found in the description of step 402, and this description is not repeated further.

In step 404, the second device determines the SCI-associated HARQ feedback mode for multicast data transmission based on the configuration information and the first field in the SCI.

The configuration information in step 404 is configured to indicate whether the second device supports the optional HARQ feedback function. The corresponding description of the configuration information can be found in the description of step 401, and this description is not repeated hereinafter.

The configuration information may be used by the second device to determine whether the first field is in the first SCI type or the second SCI type, wherein the first field is configured to indicate a multicast HARQ feedback mode.

According to an exemplary implementation, the first field is configured to indicate the format of the second SCI type, after which step 404 may include performing the following operations:

if the configuration information indicates that the second device supports the optional HARQ feedback function, determining the format of the second SCI type and the corresponding HARQ feedback mode for multicast data transmission based on the value of the first field in the first SCI type; or

if the configuration information indicates that the second device supports the optional HARQ feedback function, and there are time-frequency resources for transmitting the HARQ feedback information in the direct connection communication resource pool, determining the format of the second SCI type and the corresponding HARQ feedback mode for the multicast communications based on the first field in the first SCI type; or

if the configuration information indicates that the second device does not support the optional HARQ feedback function, or there are no time-frequency resources for transmitting HARQ feedback information in the direct connection communication resource pool, determining the multicast HARQ feedback mode based on the first field in the second type of SCI.

In this case, if there are no time-frequency resources for transmitting HARQ feedback information in the direct connection communication resource pool, default HARQ feedback is not supported.

According to another possible implementation, if the first field in the first SCI type is a newly added field, the HARQ feedback mode for multicast communication may be determined according to the value of the first field, while the format of the second SCI type may not be determined.

According to an embodiment of the disclosure, according to the configuration information indicating whether the first device supports the optional HARQ feedback function, the first device selects to use the first SCI type or the second SCI type to carry the first field indicating the HARQ feedback mode for multicast data transmission. connections. This display method is flexible. The second device can accurately determine the feedback mode for multicast communication according to the configuration information for indicating whether the second device supports the optional HARQ feedback function and the first field in SCI.

In addition, if the first device and the second device support the optional HARQ feedback function, the first field is included in the first SCI type, and the first field is also configured to indicate the format of the second SCI type so that the first SCI type can carry as much information as possible when a small size, thereby improving the transmission efficiency of the system, and it is possible to eliminate the transfer of useless fields in the second type of SCI, which can improve the transmission efficiency. If the first device and the second device do not support the optional HARQ feedback function, including the first field in the second SCI type can also reduce the size of the first SCI type, thereby improving system transmission efficiency.

In FIG. 5 is a block diagram of a device for indicating a feedback mode according to an embodiment. The device performs the function of implementing the first device in accordance with the embodiments presented above, and this function may be implemented using hardware or by executing appropriate software in hardware. As shown in FIG. 5, the device includes: a receiving unit 501 and a transmitting unit 502.

The receiving module 501 is configured to obtain configuration information configured to indicate whether the first device supports an optional hybrid automatic repeat request (HARQ) feedback function.

The transmission unit 502 is configured to transmit direct connection control information (SCI) to the second device based on the configuration information. The SCI includes a first SCI type and a second SCI type, the first SCI type or the second SCI type contains a first field, and the first field is configured to indicate a HARQ feedback mode for multicast data transmission.

Alternatively, the configuration information indicates that the first device supports the optional HARQ feedback function and the first SCI type contains the first field; or the configuration information indicates that the device does not support the optional HARQ feedback function and the second SCI type contains the first field.

Alternatively, the first SCI type contains a first field, the first field also indicating the format of the second SCI type.

Alternatively, the different HARQ feedback modes for SCI-associated multicast data transmission correspond to different formats of the second SCI type and different values of the first field.

Alternatively, the first field contains four values corresponding to four formats of the second SCI type, respectively, and these four formats of the second SCI type correspond to broadcast communication, unicast communication, multicast communication based on HARQ feedback mode 1, and multicast communication based on mode 2 HARQ feedbacks, respectively; or the first field contains three values corresponding to three formats of the second SCI type, respectively, and these three formats of the second SCI type correspond to broadcast communication, multicast communication based on HARQ feedback mode 1, unicast communication and multicast communication based on feedback mode 2 HARQ, respectively.

Alternatively, the second SCI type contains a first field, and the first SCI type or the second SCI type contains a second field, the second field indicating the type of connection of the direct connection.

Alternatively, the configuration information is information received by the first device and transmitted by the network access device, or information pre-configured in the first device.

Alternatively, the optional function is to perform HARQ feedback based on the distance between the receiving side and the transmitting side.

In FIG. 6 is a block diagram of an apparatus for determining a feedback mode according to an embodiment. The device performs the function of implementing the second device in accordance with the embodiments presented above, and this function may be implemented using hardware or by executing appropriate software in hardware. As shown in FIG. 6, the device includes a receiving module 601 and a determination module 602.

The receiving unit 601 is configured to receive direct connection control information (SCI) transmitted by the first device. The SCI includes a first SCI type and a second SCI type, the first SCI type or the second SCI type contains a first field, and the first field is configured to indicate a hybrid automatic repeat request (HARQ) feedback mode for multicast data transmission.

The determining module 602 is configured to determine the HARQ feedback mode for data transmission in multicast communication associated with SCI based on the configuration information and the first field in the SCI. The configuration information is configured to indicate whether the second device supports the optional HARQ feedback function.

Alternatively, the first SCI type contains a first field, and the first field also indicates the format of the second SCI type.

Alternatively, the different HARQ feedback modes for SCI-associated multicast data transmission correspond to different formats of the second SCI type and different values of the first field.

Alternatively, the first field contains four values corresponding to four formats of the second SCI type, respectively, and these four formats of the second SCI type correspond to broadcast communication, unicast communication, multicast communication based on HARQ feedback mode 1, and multicast communication based on mode 2 HARQ feedbacks, respectively; or the first field contains three values corresponding to three formats of the second SCI type, respectively, and these three formats of the second SCI type correspond to broadcast communication, multicast communication based on HARQ feedback mode 1, unicast communication and multicast communication based on feedback mode 2 HARQ, respectively.

Alternatively, the determination module 602 is configured to perform the following operations:

if the configuration information indicates that the second device supports the optional HARQ feedback function, determining the format of the second SCI type and the HARQ feedback mode for multicast communication based on the value of the first field in the first SCI type; or

if the configuration information indicates that the second device supports the optional HARQ feedback function, and there are time-frequency resources for transmitting the HARQ feedback information in the direct connection communication resource pool, determining the format of the second SCI type and the HARQ feedback mode for multicast communication based on the first field in the first SCI type; or

if the configuration information indicates that the second device does not support the optional HARQ feedback function, or there are no time-frequency resources for transmitting HARQ feedback information in the direct connection communication resource pool, determining the multicast HARQ feedback mode based on the first field in the second type of SCI.

Alternatively, the second SCI type contains a first field, and the first SCI type or the second SCI type contains a second field. The second field specifies the link type of the direct connection.

Alternatively, the configuration information is information received by the second device and transmitted by the network access device, or information pre-configured in the second device.

Alternatively, the optional function is to perform HARQ feedback based on the distance between the receiving side and the transmitting side.

With regard to the device illustrated in the embodiment above, the specific method of performing operations in each module has been described in detail within the scope of the method embodiments and may not be discussed in detail further.

In FIG. 7 shows a block diagram of a feedback method determination apparatus 700 according to an embodiment, and the apparatus 700 above may be referred to as the first apparatus. In FIG. 7 shows that the device 700 may include one or more of the following components: a processing component 702, a memory 704, a power component 706, an input/output (I/O, Input/Output) interface 712, and a communication component 716.

The processing component 702 typically controls all operations performed by the device 700, such as operations related to display, phone calls, data transfer, camera control, and data recording. Processing component 702 may include one or more processors 720 for executing instructions that perform all or some of the steps of the methods described above. In addition, the processing component 702 may contain one or more modules that provide interaction between the processing component 702 and other components. For example, the processing component 702 may include a media module that enables interaction between the media component 707 and the processing component 702.

The memory 704 is configured to store various types of data necessary to support the operation of the device 700. The memory 704 can be implemented using any type of non-volatile or volatile memory devices, or a combination of such devices, for example, using static random access memory (SRAM, Static Random Access Memory ), electrically erasable programmable read-only memory (EEPROM, Electrically Erasable Programmable Read-Only Memory), erasable programmable read-only memory (EPROM, Erasable Programmable Read-Only Memory), programmable read-only memory (PROM, Programmable Read-Only Memory), permanent storage device (ROM, Read-Only Memory), magnetic storage device, flash memory, magnetic or optical disk.

Power component 706 provides power to various components of device 700. Power components 706 may include a power management system, one or more power supplies, and other components associated with power generation, control, and distribution in device 700.

The input/output interface 712 provides an interface between the processing component 702 and a peripheral interface module, which may be a keyboard, mouse wheel, button, etc. These buttons may include, but are not limited to, a home button, a volume adjustment button, a start button, and a lock button.

The communication component 716 is configured to provide wireless communication between network access devices and other devices. According to an embodiment of the disclosure, communication component 716 may support a wireless network based on communication standards such as 2G, 3G, 4G, or 5G-NR, or combinations thereof, to connect to a terminal device.

According to an embodiment, the device 700 for determining the feedback mode can be implemented using one or more components such as application specific integrated circuits (ASICs, Application Specific Integrated Circuits), digital signal processors (DSP, Digital Signal Processor), digital signal processing devices (DSPDs). , Digital Signal Processing Device), programmable logic devices (PLD, Programmable Logic Device), user-programmable gate arrays (FPGA, Field Programmable Gate Array), controller, microcontroller, microprocessor, or other electronic components, through which the mode indication method described above is performed feedback or a method for determining the feedback mode.

An embodiment also provides a computer-readable storage medium, such as a memory 704, containing instructions that can be executed by the processor 720 of the device 700 to indicate the feedback mode to implement the method of indicating the feedback mode described above. Alternatively, the above instructions may be executed by the processor 720 of the feedback mode determination device 700 so as to implement the above feedback mode determination method. For example, the computer-readable storage medium may be ROM, Random-Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical storage device, and the like.

According to an embodiment of the disclosure of the invention, a communication system is also provided, comprising the first device and the second device described above.

After reading this description and applying the disclosed invention in practice, specialists in this field of technology should be obvious to other ways of disclosing the invention. The description and embodiments of the invention are to be considered as examples and the scope of the invention is defined in the appended claims.

It should be appreciated that this disclosure is not limited exactly to the structures described above and illustrated in the accompanying drawings. The scope of the invention is limited by the appended claims.

Claims (26)

1. A method for indicating a feedback mode, including: the first device receiving configuration information, the configuration information configured to indicate whether the first device supports an optional hybrid automatic repeat request (HARQ) feedback function; And transmission by the first device of direct connection control information (SCI) to the second device based on the configuration information, wherein the SCI includes the first SCI type and the second SCI type, the first SCI type or the second SCI type contains the first field, and the first field is configured to indicate the reverse mode. HARQ communication for multicast data transmission. 2. The method according to p. 1, characterized in that the configuration information indicates that the first device supports the optional HARQ feedback function and the first SCI type contains the first field; or the configuration information indicates that the first device does not support the optional HARQ feedback function, and the second SCI type contains the first field. 3. The method of claim 2, wherein the first SCI type contains a first field and the first field indicates the format of the second SCI type. 4. The method of claim 3, wherein the different HARQ feedback modes for data transmission in multicast communications associated with SCI correspond to different formats of the second SCI type and different values of the first field. 5. The method according to claim 1, wherein the configuration information is information received by the first device and transmitted by the network access device, or information pre-configured in the first device. 6. The method of claim 1, wherein the optional function is to perform HARQ feedback based on the distance between the receiving side and the transmitting side. 7. A method for determining the feedback mode, including: reception by the second device of direct connection control information (SCI) transmitted by the first device, wherein the SCI includes the first SCI type and the second SCI type, the first SCI type or the second SCI type contains the first field, and the first field is configured to indicate the hybrid automatic interrogation feedback mode retransmission (HARQ) for data transmission in multicast communication; And determining by the second device a HARQ feedback mode for transmitting data in multicast communication associated with the SCI based on the configuration information and the first field in the SCI, the configuration information being configured to indicate whether the second device supports the optional HARQ feedback function. 8. The method of claim 7, wherein the first SCI type contains a first field and the first field indicates the format of the second SCI type. 9. The method of claim 8, wherein the different HARQ feedback modes for data transmission in multicast associated with SCI correspond to different formats of the second SCI type and different values of the first field. 10. The method according to claim 7, wherein the configuration information is information received by the second device and transmitted by the network access device, or information pre-configured in the second device. 11. The method of claim 7, wherein the optional function is to perform HARQ feedback based on the distance between the receiving side and the transmitting side. 12. A device for indicating the feedback mode, containing: processor and memory, which stores instructions executed by the processor; while loading and executing instructions, the processor implements the method according to any one of paragraphs. 1-6. 13. A device for determining the feedback mode, containing: processor and memory, which stores instructions executed by the processor; while loading and executing instructions, the processor implements the method according to any one of paragraphs. 7-11. 14. A computer-readable storage medium, characterized in that when the processor executes instructions stored on this storage medium, the processor implements the method according to any one of paragraphs. 1-6 or the method according to any one of paragraphs. 7-11.

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