Communication method in d2d system, terminal device, and network device

Abstract

A communication method in a D2D system, a terminal device, and a network device, capable of avoiding interference to downlink transmission of a terminal device in a cell caused when another terminal device outside the cell uses a downlink transmission resource of the terminal device in the cell to carry out sidelink data transmission. The communication method (200) in the D2D system comprises: a first terminal device sends (210) first indication information by means of a first physical sidelink channel, the first indication information being used for determining a time slot structure of a cell in which the first terminal device is located.

Description

A communication method in a D2D system, and a terminal device and a network device TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of communication, in particular to a communication method in a D2D system, and a terminal device and a network device. BACKGROUND

[0002] The communication mode of a terminal device to terminal device (D2D) system, such as a vehicle to everything (V2X) system, adopts a sidelink (SL) transmission technology. Unlike the way in which data is received or transmitted by a network device in a traditional wireless communication system, the D2D system adopts a terminal device to terminal device direct communication mode, and thus has higher spectrum efficiency and lower transmission latency.

[0003] In a new radio (NR) system-based vehicle to everything (NR-V2X) system, a flexible time slot structure can be supported in a cell, that is, an uplink time domain symbol, and / or a downlink time domain symbol, and / or a flexible time domain symbol can be included in a time slot, and the number of each time domain symbol is configurable. The flexible time domain symbol represents an uncertain transmission direction, but the transmission direction can be changed by configuration information. For example, in the NR system, the network device can configure the time slot structure of a time slot by using cell-specific (cell-specific) radio resource control (RRC) signaling of the cell, and on this basis, the transmission direction of the flexible symbol in a time slot can be changed by using dynamic configuration signaling (such as downlink control information (DCI)) or terminal-specific (UE-specific) RRC signaling.

[0004] SUMMARY

[0005] Embodiments of the present application provide a communication method in a D2D system, and a terminal device and a network device, to avoid interference with downlink transmission of a terminal device in a cell caused by other terminal devices outside the cell using downlink transmission resources of the terminal device in the cell for sidelink data transmission.

[0006] In a first aspect, a communication method in a D2D system is provided, comprising:

[0007] The first terminal device transmits first indication information through a first physical sidelink channel, and the first indication information is used to determine the time slot structure of the cell in which the first terminal device is located.

[0008] In a second aspect, a method of communication in a D2D system is provided, comprising:

[0009] The network device sends configuration information to a first terminal device, for the first terminal device to determine first indication information according to the configuration information, and to send the first indication information through a first physical sidelink channel; wherein the first indication information is used to determine a time slot structure of a cell where the first terminal device is located.

[0010] In a third aspect, a terminal device is provided, configured to perform the method in the first aspect or any of the implementation manners thereof.

[0011] In particular, the terminal device comprises function modules configured to perform the method in the first aspect or any of the implementation manners thereof.

[0012] In a fourth aspect, a network device is provided, configured to perform the method in the second aspect or any of the implementation manners thereof.

[0013] In particular, the network device comprises function modules configured to perform the method in the second aspect or any of the implementation manners thereof.

[0014] In a fifth aspect, a communication device is provided, comprising a processor and a memory. The memory is configured to store a computer program, and the processor is configured to invoke and run the computer program stored in the memory to perform the method in any of the first aspect to the second aspect or any of the implementation manners thereof.

[0015] In a sixth aspect, a chip is provided, configured to implement the method in any of the first aspect to the second aspect or any of the implementation manners thereof.

[0016] In particular, the chip comprises a processor configured to invoke and run a computer program from a memory, so that a device installed with the chip performs the method in any of the first aspect to the second aspect or any of the implementation manners thereof.

[0017] In a seventh aspect, a computer readable storage medium is provided, configured to store a computer program, which causes a computer to perform the method in any of the first aspect to the second aspect or any of the implementation manners thereof.

[0018] In an eighth aspect, a computer program product is provided, comprising computer program instructions, which cause a computer to perform the method in any of the first aspect to the second aspect or any of the implementation manners thereof.

[0019] Ninthly, a computer program is provided that, when run on a computer, causes the computer to perform the methods of any one of the first to second aspects or their respective implementations.

[0020] Through the above technical solution, on the one hand, the embodiments of this application transmit first indication information through a first physical side-link channel via a first terminal device. The first indication information is used to determine the time slot structure of the cell where the first terminal device is located, so that other terminal devices outside the cell where the first terminal device is located can know the time slot structure configured by the first terminal device, and thus no longer use the downlink transmission resources of the first terminal device for side-link data transmission. This avoids interference to the downlink transmission of the terminal devices within the cell caused by other terminal devices outside the cell using the downlink transmission resources of the terminal devices within the cell for side-link data transmission, and can effectively improve the reliability of terminal device transmission.

[0021] On the other hand, through the above technical solution, this application embodiment sends configuration information to the first terminal device via a network device, so that the first terminal device can determine the first indication information according to the configuration information and send the first indication information through the first physical side-link channel; wherein, the first indication information is used to determine the time slot structure of the cell where the first terminal device is located, so that other terminal devices outside the cell where the first terminal device is located can know the time slot structure configured by the first terminal device, and thus no longer use the downlink transmission resources of the first terminal device for side-link data transmission, thereby avoiding interference to the downlink transmission of the terminal device within the cell caused by other terminal devices outside the cell using the downlink transmission resources of the terminal device within the cell for side-link data transmission, and effectively improving the reliability of terminal device transmission. Attached Figure Description

[0022] Figure 1A is a schematic diagram of a communication system architecture provided in an embodiment of this application.

[0023] Figure 1B is a schematic diagram of a V2X system architecture provided in an embodiment of this application.

[0024] Figure 2A is a schematic diagram of a communication method in a D2D system provided in an embodiment of this application.

[0025] Figure 2B is a schematic diagram of a time slot structure configured by the configuration information TDD-UL-DL-ConfigCommon in the embodiment corresponding to Figure 2A;

[0026] Figure 2C is a schematic diagram of another time slot structure configured by the configuration information TDD-UL-DL-ConfigCommon in the embodiment corresponding to Figure 2A;

[0027] Figure 3 is a schematic block diagram of a terminal device provided in an embodiment of this application.

[0028] Figure 4 is a schematic block diagram of a network device provided in an embodiment of this application.

[0029] Figure 5 is a schematic block diagram of a communication device provided in an embodiment of this application.

[0030] Figure 6 is a schematic block diagram of a chip provided in an embodiment of this application.

[0031] Figure 7 is a schematic block diagram of a communication system provided in an embodiment of this application. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0033] The technical solutions of this application embodiment can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), Long Term Evolution (LTE) system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, or 5G system, etc.

[0034] For example, the communication system 100 used in this application embodiment is shown in FIG1A. The communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within the coverage area. Optionally, the network device 110 may be a base station (BTS) in a GSM or CDMA system, a base station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a radio controller in a Cloud Radio Access Network (CRAN). Alternatively, the network device may be a mobile switching center, relay station, access point, vehicle-mounted equipment, wearable device, hub, switch, bridge, router, network-side equipment in a 5G network, or network equipment in a future evolved Public Land Mobile Network (PLMN), etc.

[0035] The communication system 100 also includes at least one terminal device 120 located within the coverage area of ​​the network device 110. As used herein, "terminal device" includes, but is not limited to, devices configured to receive / transmit communication signals via wired connections, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as for cellular networks, Wireless Local Area Networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters; and / or other terminal devices. Terminal devices configured to communicate via a wireless interface may be referred to as "wireless communication terminal," "wireless terminal," or "mobile terminal." Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communications system (PCS) terminals that can combine cellular radiotelephony with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notebooks, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers or other electronic devices that include radiotelephone transceivers. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communication equipment, user agents, or user equipment. Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in future PLMNs, etc.

[0036] Optionally, the terminal devices 120 can communicate directly with each other via Device to Device (D2D).

[0037] Alternatively, a 5G system or 5G network may also be referred to as a New Radio (NR) system or NR network.

[0038] In D2D systems, such as V2X systems, direct communication between terminal devices offers higher spectral efficiency and lower transmission latency. Terminal devices can communicate via the Uu interface, relayed by access network equipment, or they can communicate directly via the PC5 interface, as shown in Figure 1B.

[0039] Figure 1A exemplarily illustrates a network device and two terminal devices. Optionally, the communication system 100 may include multiple network devices, and each network device may include other numbers of terminal devices within its coverage area. This application embodiment does not limit this.

[0040] Optionally, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

[0041] It should be understood that devices with communication functions in the network / system of this application embodiment can be referred to as communication devices. Taking the communication system 100 shown in FIG1A as an example, the communication device may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 can be the specific devices described above, which will not be repeated here. The communication device may also include other devices in the communication system 100, such as network controllers, mobility management entities, and other network entities. This application embodiment does not limit this.

[0042] It should be understood that the terms "system" and "network" are often used interchangeably in this document. The term "and / or" in this document merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0043] 3GPP defines two transmission modes: transmission mode A and transmission mode B.

[0044] Transmission Mode A: The transmission resources of the terminal device are allocated by the network device. The terminal device transmits side data on the side link according to the transmission resources allocated by the network device. The network device can allocate transmission resources for a single transmission or semi-static transmission to the terminal.

[0045] Transmission Mode B: The terminal device independently selects a transmission resource from the resource pool to transmit sideline data.

[0046] In D2D (NR-D2D) or vehicular-to-everything (NR-V2X) wireless communication systems based on New Radio (NR) systems, flexible time slot structures can be supported within a cell. This means that a single time slot can include uplink time domain symbols, and / or downlink time domain symbols, and / or flexible time domain symbols, and the number of each time domain symbol is configurable. Flexible time domain symbols represent uncertain transmission directions, but these directions can be changed through configuration information. For example, in an NR system, network devices can configure the time slot structure of a time slot using semi-static configuration signaling (e.g., cell-specific Radio Resource Control (RRC) signaling). Based on this, the transmission direction of flexible symbols within a time slot can be changed through dynamic configuration signaling (e.g., Downlink Control Information (DCI)) or terminal-specific semi-static configuration signaling (e.g., UE-specific RRC signaling).

[0047] For example, in an NR system, the format of the TDD-UL-DL-ConfigCommon configuration slot structure in RRC signaling can include the following parameters:

[0048] Reference subcarrier spacing information, also known as reference subcarrier spacing, is used to determine the temporal boundaries of the UL-DL pattern;

[0049] Pattern 1 and Pattern 2 are used to determine the pattern of UL-DL; Pattern 2 is an optional configuration parameter; specifically, Pattern 1 may include the following parameters:

[0050] Periodic information, also known as dl-UL-TransmissionPeriodicity, is used to determine the period of the UL-DL pattern;

[0051] The downlink slot count indicator, also known as nrofDownlinkSlots, is used to determine that within each cycle, nrofDownlinkSlots slots, starting from the beginning of that cycle, are the full downlink slots.

[0052] The downlink time-domain symbol count indicator, also known as nrofDownlinkSymbols, is used to determine that the first nrofDownlinkSymbols time-domain symbols of the next time slot after nrofDownlinkSlots full downlink time slots are downlink time-domain symbols.

[0053] The uplink slot count indicator, also known as nrofUplinkSlots, is used to determine that the last nrofUplinkSlots slots in each cycle are all uplink slots.

[0054] The uplink time domain symbol count indicator, also known as nrofUplinkSymbols, is used to determine that the last nrofUplinkSymbols time domain symbols of the slot preceding the nrofUplinkSlots full uplink time slots are uplink time domain symbols.

[0055] In NR-V2X systems, lateral transmissions can be carried on shared or dedicated carriers. When lateral transmissions are carried on a shared carrier, both lateral and uplink transmissions share the same carrier; for example, both lateral and uplink transmissions use a 2GHz carrier. When lateral transmissions are carried on a dedicated carrier, the lateral and uplink transmissions use different carriers, or the lateral transmissions are carried on carriers belonging to the Intelligent Transportation System (ITS); for example, lateral transmissions use a 5.9GHz carrier, and uplink transmissions use a 2GHz carrier. If lateral transmissions are carried on a shared carrier, to avoid impacting downlink transmissions, lateral transmissions can only be transmitted on uplink time-domain symbols and / or flexible time-domain symbols, and not on downlink time-domain symbols.

[0056] However, since other terminal devices outside the cell are unaware of the time slot structure configured by the terminal devices inside the cell, they may use the downlink transmission resources of the terminal devices inside the cell to perform side-channel data transmission, thereby interfering with the downlink transmission of the terminal devices inside the cell.

[0057] However, in NR-V2X systems, the time slot structure within a cell can be configured using configuration information in RRC signaling. Sending all configuration information to other terminals outside the cell would result in very high signaling overhead. Therefore, to reduce signaling overhead, there is an urgent need to provide a communication method in D2D systems that indicates only a portion of the configured time slot structure information, rather than all of it. This would prevent interference to the downlink transmission of terminals within the cell caused by other terminals outside the cell using downlink transmission resources for sidelink data transmission.

[0058] The network devices involved in this application may be mobility management devices, such as the Access and Mobility Management Function (AMF) in the 5G core network (Next Generation Core Network, NGCN) or the Mobility Management Entity (MME) in the 4G core network (Evolved Packet Core Network, EPC). Alternatively, they may be policy control devices, such as the Vehicle to Everything Control Function (V2X CF) or Policy Control Function (PCF) in a V2X system. This embodiment does not impose any particular limitation on these devices.

[0059] The network structure supports both V2X CF as an independent network element and V2X CF functionality carried in PCF. This embodiment does not impose any special limitations on this.

[0060] It should be noted that the description in this application uses time slots as the time unit throughout. Optionally, subframes can also be used as the time unit. Therefore, the time slot structure can be a subframe structure; correspondingly, the uplink time slot can be an uplink subframe, the downlink time slot can be a downlink subframe, and the flexible time slot can be a flexible subframe.

[0061] Figure 2A is a schematic flowchart of a communication method 200 in a D2D system provided in an embodiment of this application, as shown in Figure 2A.

[0062] 210. The first terminal device transmits first indication information through a first physical side-channel. The first indication information can be used to determine the time slot structure of the cell where the first terminal device is located.

[0063] Therefore, the time slot structure of the cell where the first terminal device is located, as determined by the first indication information, may include, but is not limited to, at least one of the following information:

[0064] Uplink timeslot information and / or uplink time domain symbol information;

[0065] Downlink time slot information and / or downlink time domain symbol information; and

[0066] Flexible time slot information and / or flexible time domain symbol information.

[0067] Among them, uplink time slot information and / or uplink time domain symbol information is one set of information, downlink time slot information and / or downlink time domain symbol information is another set of information, and flexible time slot information and / or flexible time domain symbol information is yet another set of information.

[0068] Wherein, the uplink time slot information may include, but is not limited to, the number of uplink time slots; the uplink time domain symbol information may include, but is not limited to, the number of uplink time domain symbols; the downlink time slot information may include, but is not limited to, the number of downlink time slots; the flexible time slot information may include, but is not limited to, the number of flexible time slots; the flexible time domain symbol information may include, but is not limited to, the number of flexible time domain symbols.

[0069] Optionally, in one possible implementation of this embodiment, it can be applied to a V2X system. In this case, in step 210, the first terminal device can specifically send the first indication information through the Physical Sidelink Broadcast Channel (PSBCH).

[0070] Optionally, in one possible implementation of this embodiment, the first indication information may further be used to determine at least one of the following:

[0071] Reference subcarrier spacing information; and

[0072] Periodic information.

[0073] It is understandable that the technical solution in this possible implementation can be applied to any of the following possible implementations.

[0074] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine the complete time slot structure of the cell where the first terminal device is located, that is, to determine uplink time slot information and / or uplink time domain symbol information, downlink time slot information and / or downlink time domain symbol information, and flexible time slot information and / or flexible time domain symbol information. Then, in 210, the first indication information may include at least two sets of the following indication information:

[0075] Indication information used to determine uplink time slot information and / or uplink time domain symbol information;

[0076] Indication information used to determine downlink time slot information and / or downlink time domain symbol information; and

[0077] Indicative information used to determine flexible time slot information and / or flexible time domain symbol information.

[0078] Among them, the indication information used to determine uplink time slot information and / or uplink time domain symbol information is one set of indication information, the indication information used to determine downlink time slot information and / or downlink time domain symbol information is another set of indication information, and the indication information used to determine flexible time slot information and / or flexible time domain symbol information is yet another set of indication information.

[0079] In NR-V2X systems, if sideline transmission can be carried on a shared carrier, in order to avoid affecting downlink transmission, sideline data is transmitted on uplink time domain symbols, or on flexible time domain symbols, and not on downlink time domain symbols.

[0080] For example, if sideline data can only be transmitted on uplink time-domain symbols in a shared carrier, then the first indication information may include indication information for determining uplink time slot information and / or uplink time-domain symbol information, and may further include indication information for determining downlink time slot information and / or downlink time-domain symbol information, and / or, indication information for determining flexible time slot information and / or flexible time-domain symbol information. In this way, the time slot structure of the cell where the first terminal device is located can be determined based on the first indication information.

[0081] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine uplink time slot information and / or uplink symbol information. Therefore, in 210, the first indication information may include indication information for determining uplink time slot information and / or uplink time domain symbol information, indicating uplink time domain symbol information in one cycle, but does not include indication information for determining downlink time slot information and / or downlink time domain symbol information.

[0082] Optionally, this implementation is suitable for sideline data to be transmitted using uplink time domain symbols.

[0083] It should be noted that the indication information for the uplink time slot and the uplink time domain symbol can specifically be one indication information used to indicate the uplink time slot and the uplink time domain symbol, or it can be two different indication information, one indicating the uplink time slot and the other indicating the uplink time domain symbol. This embodiment does not impose any particular limitation on this.

[0084] Accordingly, the indication information for downlink time slots and downlink time domain symbols can specifically be one indication information used to indicate downlink time slots and downlink time domain symbols, or it can be two different indication information, one indicating information used to indicate downlink time slots and the other indicating information used to indicate downlink time domain symbols. This embodiment does not impose any particular limitation on this.

[0085] For example, if sidelink data can only be transmitted on uplink time-domain symbols in a shared carrier, then the first indication information can include only indication information for determining uplink time slot information and / or uplink time-domain symbol information, such as uplink time slot number indication information nrofUplinkSlots (9 bits) and uplink time-domain symbol number indication information nrofUplinkSymbols (4 bits), without needing to include indication information for determining downlink time slot information and / or downlink time-domain symbol information, such as downlink time slot number indication information nrofDownlinkSlots (9 bits) and downlink time-domain symbol number indication information nrofDownlinkSymbols (4 bits). This effectively saves signaling overhead, reducing the signaling overhead for each mode (i.e., pattern 1 or pattern 2) by 13 bits.

[0086] It should be noted that the names of the specific indication information in the above examples and the following examples use the original names of the indication information in the RRC signaling. Other new names can also be used, and this embodiment does not impose any special restrictions on this.

[0087] Therefore, if only pattern 1 is configured, the first indication information indicating the time slot structure of pattern 1 only requires 19 bits, namely 3 bits of reference subcarrier spacing information referenceSubcarrierSpacing, 3 bits of period information dl-UL-TransmissionPeriodicity, 9 bits of uplink time slot number indication information nrofUplinkSlots, and 4 bits of uplink time domain symbol number indication information nrofUplinkSymbols; if both pattern 1 and pattern 2 are configured, the first indication information indicating the time slot structure of pattern 1 and pattern 2 only requires 35 bits.

[0088] Thus, other terminal devices outside the cell where the first terminal device is located can obtain the uplink time slot information and / or uplink symbol information configured by the first terminal device based on the first indication information, and can directly determine the uplink time domain symbol that can transmit sidelink data. Since the first indication information does not include indication information for determining downlink time slot information and / or downlink time domain symbol information, the signaling overhead can be reduced.

[0089] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine downlink time slot information and / or downlink symbol information. Therefore, in 210, the first indication information may include indication information for determining downlink time slot information and / or downlink time domain symbol information, indicating downlink time domain symbol information in one cycle, but does not include indication information for determining uplink time slot information and / or uplink time domain symbol information.

[0090] Optionally, this implementation is suitable for transmitting sideline data using uplink time domain symbols and / or flexible time domain symbols.

[0091] For example, if the sidelink data can be transmitted on uplink time-domain symbols and flexible time-domain symbols in a shared carrier, then the first indication information can only include indication information for determining downlink time slot information and / or downlink time-domain symbol information, such as downlink time slot number indication information nrofDownlinkSlots (9 bits) and downlink time-domain symbol number indication information nrofDownlinkSymbols (4 bits). However, it is not necessary to include indication information for determining uplink time slot information and / or uplink time-domain symbol information, such as uplink time slot number indication information nrofUplinkSlots (9 bits) and uplink time-domain symbol number indication information nrofUplinkSymbols (4 bits). In this way, signaling overhead can be effectively reduced, with the signaling overhead for each mode (i.e., pattern 1 or pattern 2) reduced by a maximum of 13 bits and a minimum of 4 bits.

[0092] Therefore, if only pattern 1 is configured, the first indication information indicating the time slot structure of pattern 1 only needs 19 bits, namely 3 bits of reference subcarrier spacing information referenceSubcarrierSpacing, 3 bits of period information dl-UL-TransmissionPeriodicity, 9 bits of downlink time slot number indication information nrofDownlinkSlots, and 4 bits of downlink time domain symbol number indication information nrofDownlinkSymbols; if both pattern 1 and pattern 2 are configured, the first indication information indicating the time slot structure of pattern 1 and pattern 2 only needs 35 bits.

[0093] Thus, other terminal devices outside the cell where the first terminal device is located can, based on the first indication information, learn the downlink time slot information and / or downlink symbol information configured by the first terminal device. Furthermore, based on other relevant information in the configuration information, such as periodic information, they can determine whether the time domain symbols other than the downlink time domain symbols are uplink time domain symbols and flexible time domain symbols. Then, they can determine the uplink time domain symbols and flexible time domain symbols capable of transmitting sidelink data. Since the first indication information does not include indication information for determining the uplink time slot information and / or uplink time domain symbol information, the signaling overhead can be reduced.

[0094] In the two possible implementations described above, since the information indicated by the first indication information is not all the time slot structure information configured by the network device for the first terminal device, but only a portion of the time slot structure information, the signaling overhead can be effectively reduced.

[0095] In this application, it is not necessary to instruct the network device to provide all the time slot structure information configured for the first terminal device, but only a portion of the time slot structure information, thereby reducing signaling overhead. Furthermore, the terminal device outside the cell can determine the uplink or downlink transmission resources within the cell based on this first instruction information. Therefore, the terminal outside the cell can use the uplink transmission resources within the cell for side-channel data transmission, or avoid using the downlink transmission resources within the cell for side-channel data transmission, thereby avoiding interference with the downlink transmission of the terminal device within the cell.

[0096] Optionally, in one possible implementation of this embodiment, before step 210, the network device may further send configuration information to the first terminal device. Then, after the first terminal device receives the configuration information sent by the network device, the first terminal device can determine the first indication information based on the configuration information.

[0097] In a specific implementation, the first terminal device can determine the first indication information based on the configuration information; wherein, the first indication information may include at least one of the following:

[0098] Reference subcarrier spacing information;

[0099] Periodic information;

[0100] Indication information used to determine uplink timeslot information;

[0101] Indication information used to determine uplink time-domain symbol information;

[0102] Indication information used to determine downlink time slot information;

[0103] Indication information used to determine downlink time-domain symbol information;

[0104] Indication information used to determine flexible time slot information; and

[0105] Indication information used to determine flexible time-domain symbol information;

[0106] The configuration information may include at least one of the following:

[0107] Reference subcarrier spacing information;

[0108] Periodic information;

[0109] Uplink timeslot count indication information;

[0110] Uplink time domain symbol count indication information;

[0111] Downlink timeslot count indication information;

[0112] Downlink time-domain symbol count indication information;

[0113] Flexible timeslot number indication information; and

[0114] The number of flexible time-domain symbols indicates information.

[0115] Specifically, the value of the first indication information can belong to a first set, and the value of the configuration information can belong to a second set or a third set. The third set can be a subset of the second set.

[0116] In this way, by limiting the value range of the configuration information in the configuration information to the second set, that is, limiting it to the first set or the third set, the value range of the first indication information can be represented with fewer bits, which can effectively reduce signaling overhead.

[0117] In a specific implementation, if the configuration information value belongs to the second set, then the values ​​in the second set are not restricted. In this case, the first set can be a subset of the second set, thus restricting the first set.

[0118] At this point, since the range of values ​​for the first instruction information, i.e. the first set, is limited, the range of values ​​for the first set is narrowed, thereby reducing signaling overhead.

[0119] For example, the reference subcarrier spacing information `referenceSubcarrierSpacing` in the existing configuration information `TDD-UL-DL-ConfigCommon` includes values ​​such as {15, 30, 60, 120, 240} kHz. When side-channel transmission operates on a shared carrier, the range of this parameter can be limited, thereby reducing signaling overhead. For example, the range of `referenceSubcarrierSpacing` could be {15, 60} kHz, where 15 kHz is used for Frequency Range 1 (FR1) and 60 kHz is used for Frequency Range 2 (FR2), requiring only 1 bit for representation; or, for another example, the range of `referenceSubcarrierSpacing` could be {60, 120} kHz, where 60 kHz is used for FR1 and 120 kHz for FR2, again requiring only 1 bit for representation.

[0120] Alternatively, for example, consider the existing configuration information TDD-UL-DL-ConfigCommon, which contains pattern1 and pattern2, where pattern2 is an optional parameter. When sideline transmission operates on a shared carrier, only pattern1 can be configured, and pattern2 can be omitted, thereby reducing signaling overhead.

[0121] Alternatively, for example, the period information dl-UL-TransmissionPeriodicity in the existing configuration information TDD-UL-DL-ConfigCommon includes values ​​such as {0.5, 0.625, 1, 1.25, 2, 2.5, 5, 10} ms. When the sideline transmission operates on a shared carrier, the range of this parameter can be limited, thereby reducing signaling overhead. For example, the range of dl-UL-TransmissionPeriodicity can be {0.5, 2} ms, in which case only 1 bit is needed; or, for another example, the range of dl-UL-TransmissionPeriodicity can be {0.125, 1} ms, in which case only 1 bit is needed.

[0122] By limiting the value range of the period information dl-UL-TransmissionPeriodicity, the transmission latency of sideline data can be effectively reduced. Examples of dl-UL-TransmissionPeriodicity values ​​of 10ms and 2ms are provided below to illustrate how limiting this parameter's value range can further effectively reduce the transmission latency of sideline data.

[0123] Figure 2B is a schematic diagram of a time slot structure configured by the configuration information TDD-UL-DL-ConfigCommon in the embodiment corresponding to Figure 2A. As shown in Figure 2B, dl-UL-TransmissionPeriodicity is configured to 10ms, and referenceSubcarrierSpacing is configured to 15kHz, meaning that one period can include 10 time slots. Each time slot includes 2 full downlink time slots, 1 full uplink time slot, the first 5 time domain symbols of the third time slot are downlink time domain symbols, and the last 6 time domain symbols of the penultimate time slot are uplink time domain symbols. The remaining middle part is all flexible time domain symbols. For NR-V2X systems, if sidelink data is transmitted on uplink transmission resources, only the last two time slots out of the eight time slots can be used for sidelink data transmission. The first six time slots cannot be used for sidelink data transmission. This will lead to an increase in transmission latency, making it difficult to meet the latency requirements of NR-V2X systems, such as a time domain requirement of 3-5 milliseconds (ms).

[0124] Therefore, if sideline transmission operates on a shared carrier, the `dl-UL-TransmissionPeriodicity` configured in the configuration information `TDD-UL-DL-ConfigCommon` needs to be limited. As shown in Figure 2C, `dl-UL-TransmissionPeriodicity` is configured to 2ms, and `referenceSubcarrierSpacing` is configured to 15kHz, meaning one period can include two time slots. Each time slot includes 0 full downlink time slots (i.e., no full downlink time slots), and the last 6 time domain symbols of the last time slot are uplink time domain symbols, while the remaining intermediate parts are all flexible time domain symbols. For NR-V2X systems, if sideline data is transmitted on uplink transmission resources, in every two time slots, one time slot's uplink time domain symbols can be used for sideline data transmission. This prevents excessive transmission latency and meets the latency requirements of NR-V2X systems (3-5ms).

[0125] Alternatively, for example, the uplink slot count indicator `nrofUplinkSlots` in the existing configuration information `TDD-UL-DL-ConfigCommon` has a value range of 0-320, requiring 9 bits for representation. When sidelink transmission operates on a shared carrier, the value range of this parameter can be limited, thereby reducing signaling overhead. For example, the uplink slot count indicator `nrofUplinkSlots` can have a value range of 0-7, requiring only 3 bits for representation.

[0126] It is understandable that when the range of values ​​for other parameters is limited, the range of values ​​for this parameter is also reduced accordingly, thus reducing signaling overhead.

[0127] For example, the value range of `referenceSubcarrierSpacing` is {15, 60} kHz. The default value for FR1 is 15 kHz, and for FR2 it is 60 kHz. The value range of `dl-UL-TransmissionPeriodicity` is {0.125, 1} ms. Specifically, a `dl-UL-TransmissionPeriodicity` value of 1 ms corresponds to FR1. Combined with `referenceSubcarrierSpacing` at 15 kHz for FR1, meaning one period includes only one time slot, this parameter is 0, meaning it is not needed; only `nrofUplinkSymbols` needs to be configured for the uplink time domain symbol in one time slot. Similarly, a `dl-UL-TransmissionPeriodicity` value of 0.125 ms corresponds to FR2. Combined with `referenceSubcarrierSpacing` at 60 kHz for FR2, meaning one period includes only one time slot, this parameter is 0, meaning it is not needed; only `nrofUplinkSymbols` needs to be configured for the uplink time domain symbol in one time slot.

[0128] Alternatively, for example, the value range of referenceSubcarrierSpacing is {15, 60} kHz, with 15 kHz as the default for FR1 and 60 kHz as the default for FR2, and the value range of dl-UL-TransmissionPeriodicity is {0.5, 2} ms. In this context, dl-UL-TransmissionPeriodicity takes a value of 2ms, corresponding to FR1. Combined with referenceSubcarrierSpacing, FR1 takes a value of 15kHz, meaning one period includes only two slots. In this case, nrofUplinkSlots can take values ​​of 0 or 1, requiring 1 bit for representation. If both slots in this period can be configured as full uplink slots, nrofUplinkSlots can be configured as 1 and nrofUplinkSymbols as 14 to represent two full uplink slots. Similarly, dl-UL-TransmissionPeriodicity takes a value of 0.5ms, corresponding to FR2. Combined with referenceSubcarrierSpacing, FR2 takes a value of 60kHz, meaning one period includes only two slots. In this case, nrofUplinkSlots can take values ​​of 0 or 1, requiring 1 bit for representation. If both slots in this period can be configured as full uplink slots, nrofUplinkSlots can be configured as 1 and nrofUplinkSymbols as 14 to represent two full uplink slots.

[0129] Alternatively, similar to the uplink slot number indication information nrofUplinkSlots, when the sideline transmission is operating on a shared carrier, the range of values ​​for the downlink slot number indication information nrofDownlinkSlots in the existing configuration information TDD-UL-DL-ConfigCommon can be limited, thereby reducing signaling overhead.

[0130] Alternatively, for example, the indication information for determining flexible time slot information and / or the indication information for determining flexible time domain symbol information in the first indication information can be determined based on the indication information for the number of flexible time slots and / or the indication information for the number of flexible time domain symbols in the configuration information. Alternatively, it can be determined based on the indication information for the number of uplink time slots and / or the indication information for the number of uplink time domain symbols and / or the indication information for the number of downlink time slots and / or the indication information for the number of downlink time domain symbols in the configuration information. This embodiment does not impose any particular limitation on this.

[0131] Taking the first indication information sent by PSBCH, which includes all parameters in the configuration information TDD-UL-DL-ConfigCommon, as an example, the value range of the first indication information is limited, and the number of bits required to indicate each parameter is as follows:

[0132] The value range of referenceSubcarrierSpacing can be {15, 60} kHz to 1 bit;

[0133] Configure only pattern1, do not configure pattern2;

[0134] The value range of dl-UL-TransmissionPeriodicity is {0.5, 2} ms — 1 bit;

[0135] The value range of nrofUplinkSlots is 0, 1 to 1 bit;

[0136] The value range of nrofDownlinkSlots is 0, 1 to 1 bit;

[0137] The value range of nrofUplinkSymbols is 0-13 to 4 bits;

[0138] The value range of nrofDownlinkSymbols is 0-13 to 4 bits;

[0139] Therefore, 12 bits of indication information need to be transmitted in the PSBCH to indicate the time slot structure.

[0140] In another specific implementation process, the technical solution from the previous implementation process can be applied to the aforementioned possible implementation methods, which can further reduce signaling overhead on the basis of the aforementioned implementation methods.

[0141] Taking the first indication information sent by PSBCH, which includes the indication information of the uplink time domain symbol in the configuration information TDD-UL-DL-ConfigCommon, as an example, the value range of the first indication information is limited, and the number of bits required to indicate each parameter is as follows:

[0142] The value range of referenceSubcarrierSpacing can be {15, 60} kHz to 1 bit;

[0143] Configure only pattern1, do not configure pattern2;

[0144] The dl-UL-TransmissionPeriodicity parameter can take values ​​of {0.5, 2} ms – 1 bit;

[0145] The nrofUplinkSlots parameter can take values ​​ranging from 0, 1 to 1 bit.

[0146] The nrofUplinkSymbols parameter can take values ​​ranging from 0 to 13 bits to 4 bits.

[0147] Therefore, 7 bits of indication information need to be transmitted in the PSBCH to indicate the time slot structure.

[0148] In another specific implementation, if the value of the configuration information belongs to the third set, then the values ​​of the second set are directly restricted to the third set. Since the third set is already a subset of the second set, the first set can be the same set as the third set, thus achieving the purpose of restricting the first set.

[0149] For a detailed description of the specific limitations of the third set, please refer to the relevant content on limiting the value range of the first indication information in the two aforementioned implementation processes.

[0150] In another specific implementation, if the value of the configuration information belongs to the second set, then the value of the second set is not limited. In this case, the first set can be a subset of the second set. In addition to using the technical solution provided in the above implementation to determine the first indication information, the first terminal device can optionally determine other parameters in the first indication information based on the relationship between the reference subcarrier spacing information of the first indication information and the reference subcarrier spacing information of the configuration information.

[0151] For example, the value of referenceSubcarrierSpacing in the first indication information is 15kHz, i.e., refSCS1 = 15kHz, and the value of referenceSubcarrierSpacing in the configuration information is 30kHz, i.e., refSCS2 = 30kHz. That is to say, the slot length or time domain symbol length determined according to refSCS1 is twice the slot length or time domain symbol length determined according to refSCS2. Therefore, the first terminal device can determine the values ​​of the indication information used to determine uplink slot information, the indication information used to determine uplink time domain symbol information, the indication information used to determine downlink slot information, and the indication information used to determine downlink time domain symbol information in the first indication information to be half the values ​​of the corresponding uplink slot number indication information, uplink time domain symbol number indication information, downlink slot number indication information, and downlink time domain symbol number indication information in the configuration information.

[0152] It should be noted that in the technical solution of this application, limiting the value of the configuration information, or limiting the value of the first indication information, or limiting the value of the third set, indicates limiting the number of candidate values. The specific value can be the same as or different from the candidate parameter values ​​of existing network configuration information. For example, the parameter dl-UL-TransmissionPeriodicity in the network configuration information includes values ​​such as {0.5, 0.625, 1, 1.25, 2, 2.5, 5, 10} ms. When the value range of this parameter is limited, the parameter value can be {0.5, 2} ms, which is the same as the candidate parameter values ​​of existing parameters; or the parameter value can be {0.25, 2} ms, where 0.25 ms is different from the candidate parameter values ​​of existing parameters.

[0153] It should be noted that although the above description of the technical solution of this application is based on the V2X system, the technical solution of this application can also be applied to other D2D systems.

[0154] In this embodiment, a first terminal device sends first indication information through a first physical side-link channel. The first indication information is used to determine at least one of the following: the time slot structure of the cell where the first terminal device is located; uplink time slot information and / or uplink time domain symbol information; and downlink time slot information and / or downlink time domain symbol information. This enables other terminal devices outside the cell where the first terminal device is located to know the time slot structure configured by the first terminal device, and thus no longer use the downlink transmission resources of the first terminal device for side-link data transmission. This avoids interference to the downlink transmission of the terminal devices within the cell caused by other terminal devices outside the cell using the downlink transmission resources of the terminal devices within the cell for side-link data transmission, and can effectively improve the reliability of terminal device transmission.

[0155] Furthermore, by adopting the technical solution provided in this application, since the information indicated by the first indication information is part of the time slot structure information, the signaling overhead can be effectively reduced.

[0156] Figure 3 is a schematic block diagram of a terminal device 300 provided in an embodiment of this application, as shown in Figure 3. This embodiment provides a terminal device for executing the method executed by the terminal device in the embodiment corresponding to Figure 1.

[0157] Specifically, the terminal device 300 includes a functional module for executing the method performed by the terminal device in the embodiment corresponding to FIG1. ​​The terminal device 300 may include an indication unit 310, which can be used to send first indication information through a first physical side cross channel, the first indication information being used to determine the time slot structure of the cell where the terminal device is located.

[0158] Therefore, the time slot structure of the cell where the first terminal device is located, as determined by the first indication information, may include, but is not limited to, at least one of the following information:

[0159] Uplink timeslot information and / or uplink time domain symbol information;

[0160] Downlink time slot information and / or downlink time domain symbol information; and

[0161] Flexible time slot information and / or flexible time domain symbol information.

[0162] Among them, uplink time slot information and / or uplink time domain symbol information is one set of information, downlink time slot information and / or downlink time domain symbol information is another set of information, and flexible time slot information and / or flexible time domain symbol information is yet another set of information.

[0163] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine the complete time slot structure of the cell where the terminal device is located, that is, to determine uplink time slot information and / or uplink time domain symbol information, downlink time slot information and / or downlink time domain symbol information, and flexible time slot information and / or flexible time domain symbol information; then, the first indication information may include at least two sets of the following indication information:

[0164] Indication information used to determine uplink time slot information and / or uplink time domain symbol information;

[0165] Indication information used to determine downlink time slot information and / or downlink time domain symbol information; and

[0166] Indicative information used to determine flexible time slot information and / or flexible time domain symbol information.

[0167] Among them, the indication information used to determine uplink time slot information and / or uplink time domain symbol information is one set of indication information, the indication information used to determine downlink time slot information and / or downlink time domain symbol information is another set of indication information, and the indication information used to determine flexible time slot information and / or flexible time domain symbol information is yet another set of indication information.

[0168] In NR-V2X systems, if sideline transmission can be carried on a shared carrier, in order to avoid affecting downlink transmission, sideline data is transmitted on uplink time domain symbols, or on flexible time domain symbols, and not on downlink time domain symbols.

[0169] For example, if sideline data can only be transmitted on uplink time-domain symbols in a shared carrier, then the first indication information may include indication information for determining uplink time slot information and / or uplink time-domain symbol information, and may further include indication information for determining downlink time slot information and / or downlink time-domain symbol information, and / or, indication information for determining flexible time slot information and / or flexible time-domain symbol information. In this way, the time slot structure of the cell where the first terminal device is located can be determined based on the first indication information.

[0170] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine uplink time slot information and / or uplink symbol information; then, the first indication information may include indication information for determining uplink time slot information and / or uplink time domain symbol information, but does not include indication information for determining downlink time slot information and / or downlink time domain symbol information.

[0171] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine downlink time slot information and / or downlink symbol information; then, the first indication information may include indication information for determining downlink time slot information and / or downlink time domain symbol information, but does not include indication information for determining uplink time slot information and / or uplink time domain symbol information.

[0172] Optionally, in one possible implementation of this embodiment, the first indication information may further be used to determine at least one of the following:

[0173] Reference subcarrier spacing information; and

[0174] Periodic information.

[0175] Optionally, in one possible implementation of this embodiment, the indicating unit 310 may further be used to receive configuration information sent by the network device; and to determine the first indicating information based on the configuration information.

[0176] In a specific implementation, the indicating unit 310 may be used to determine the first indicating information based on the configuration information; wherein the first indicating information may include at least one of the following:

[0177] Reference subcarrier spacing information;

[0178] Periodic information;

[0179] Indication information used to determine uplink timeslot information;

[0180] Indication information used to determine uplink time-domain symbol information;

[0181] Indication information used to determine downlink time slot information;

[0182] Indication information used to determine downlink time-domain symbol information;

[0183] Indication information used to determine flexible time slot information; and

[0184] Indication information used to determine flexible time-domain symbol information;

[0185] The configuration information may include at least one of the following:

[0186] Reference subcarrier spacing information;

[0187] Periodic information;

[0188] Uplink timeslot count indication information;

[0189] Uplink time domain symbol count indication information;

[0190] Downlink timeslot count indication information;

[0191] Downlink time-domain symbol count indication information;

[0192] Flexible timeslot number indication information; and

[0193] The number of flexible time-domain symbols indicates information.

[0194] Wherein, the value of the first indication information belongs to the first set; the value of the configuration information belongs to the second set or the third set, wherein the third set is a subset of the second set; and the first set is a subset of the second set.

[0195] Optionally, in one possible implementation of this embodiment, the indication unit 310 may be used to send the first indication information through the Physical Sidelink Broadcast Channel (PSBCH).

[0196] Figure 4 is a schematic block diagram of a network device 400 provided in an embodiment of this application. As shown in Figure 4, this embodiment provides a network device for executing the method executed by the network device in the embodiment corresponding to Figure 1.

[0197] Specifically, the network device 400 includes a functional module for executing the method performed by the network device in the embodiment corresponding to FIG1. ​​The network device 400 may include a configuration unit 410, which can be used to send configuration information to a first terminal device, so that the first terminal device can determine first indication information according to the configuration information and send the first indication information through a first physical side-channel; wherein, the first indication information is used to determine the time slot structure of the cell where the first terminal device is located.

[0198] Therefore, the time slot structure of the cell where the first terminal device is located, as determined by the first indication information, may include, but is not limited to, at least one of the following information:

[0199] Uplink timeslot information and / or uplink time domain symbol information;

[0200] Downlink time slot information and / or downlink time domain symbol information; and

[0201] Flexible time slot information and / or flexible time domain symbol information.

[0202] Among them, uplink time slot information and / or uplink time domain symbol information is one set of information, downlink time slot information and / or downlink time domain symbol information is another set of information, and flexible time slot information and / or flexible time domain symbol information is yet another set of information.

[0203] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine the complete time slot structure of the cell where the first terminal device is located, i.e., to determine the uplink time slot information and / or uplink time domain symbol information, downlink time slot information and / or downlink time domain symbol information, and flexible time slot information and / or flexible time domain symbol information; then, the first indication information may include at least two sets of the following indication information:

[0204] Indication information used to determine uplink time slot information and / or uplink time domain symbol information;

[0205] Indication information used to determine downlink time slot information and / or downlink time domain symbol information; and

[0206] Indicative information used to determine flexible time slot information and / or flexible time domain symbol information.

[0207] Among them, the indication information used to determine uplink time slot information and / or uplink time domain symbol information is one set of indication information, the indication information used to determine downlink time slot information and / or downlink time domain symbol information is another set of indication information, and the indication information used to determine flexible time slot information and / or flexible time domain symbol information is yet another set of indication information.

[0208] In NR-V2X systems, if sideline transmission can be carried on a shared carrier, in order to avoid affecting downlink transmission, sideline data is transmitted on uplink time domain symbols, or on flexible time domain symbols, and not on downlink time domain symbols.

[0209] For example, if sideline data can only be transmitted on uplink time-domain symbols in a shared carrier, then the first indication information may include indication information for determining uplink time slot information and / or uplink time-domain symbol information, and may further include indication information for determining downlink time slot information and / or downlink time-domain symbol information, and / or, indication information for determining flexible time slot information and / or flexible time-domain symbol information. In this way, the time slot structure of the cell where the first terminal device is located can be determined based on the first indication information.

[0210] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine uplink time slot information and / or uplink symbol information; then, the first indication information may include indication information for determining uplink time slot information and / or uplink time domain symbol information, but does not include indication information for determining downlink time slot information and / or downlink time domain symbol information.

[0211] Optionally, in one possible implementation of this embodiment, the first indication information is used to determine downlink time slot information and / or downlink symbol information; then, the first indication information may include indication information for determining downlink time slot information and / or downlink time domain symbol information, but does not include indication information for determining uplink time slot information and / or uplink time domain symbol information.

[0212] Optionally, in one possible implementation of this embodiment, the first indication information may further be used to determine at least one of the following:

[0213] Reference subcarrier spacing information; and

[0214] Periodic information.

[0215] Optionally, in one possible implementation of this embodiment, the first indication information may specifically include first indication information; then, the first indication information can be determined by the first terminal device according to the configuration information; wherein, the first indication information may include at least one of the following:

[0216] Reference subcarrier spacing information;

[0217] Periodic information;

[0218] Indication information used to determine uplink timeslot information;

[0219] Indication information used to determine uplink time-domain symbol information;

[0220] Indication information used to determine downlink time slot information;

[0221] Indication information used to determine downlink time-domain symbol information;

[0222] Indication information used to determine flexible time slot information; and

[0223] Indication information used to determine flexible time-domain symbol information;

[0224] The configuration information may include at least one of the following:

[0225] Reference subcarrier spacing information;

[0226] Periodic information;

[0227] Uplink timeslot count indication information;

[0228] Uplink time domain symbol count indication information;

[0229] Downlink timeslot count indication information;

[0230] Downlink time-domain symbol count indication information;

[0231] Flexible timeslot number indication information; and

[0232] The number of flexible time-domain symbols indicates information.

[0233] Wherein, the value of the first indication information belongs to the first set; the value of the configuration information belongs to the second set or the third set, wherein the third set is a subset of the second set; and the first set is a subset of the second set.

[0234] Figure 5 is a schematic structural diagram of a communication device 500 provided in an embodiment of this application. The communication device 500 shown in Figure 5 includes a processor 510, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0235] Optionally, as shown in FIG5, the communication device 500 may further include a memory 520. The processor 510 may retrieve and run computer programs from the memory 520 to implement the methods described in the embodiments of this application.

[0236] The memory 520 can be a separate device independent of the processor 510, or it can be integrated into the processor 510.

[0237] Optionally, as shown in FIG5, the communication device 500 may further include a transceiver 530, and the processor 510 may control the transceiver 530 to communicate with other devices. Specifically, it may send information or data to other devices or receive information or data sent by other devices.

[0238] The transceiver 530 may include a transmitter and a receiver. The transceiver 530 may further include antennas, and the number of antennas may be one or more.

[0239] Optionally, the communication device 500 may specifically be a network device in the embodiments of this application, and the communication device 500 may implement the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0240] Optionally, the communication device 500 may specifically be a terminal device in the embodiments of this application, and the communication device 500 may implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0241] Figure 6 is a schematic structural diagram of chip 600 according to an embodiment of this application. The chip 600 shown in Figure 6 includes a processor 610, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0242] Optionally, as shown in FIG6, chip 600 may further include memory 620. Processor 610 can retrieve and run computer programs from memory 620 to implement the methods in the embodiments of this application.

[0243] The memory 620 can be a separate device independent of the processor 610, or it can be integrated into the processor 610.

[0244] Optionally, the chip 600 may also include an input interface 630. The processor 610 can control the input interface 630 to communicate with other devices or chips; specifically, it can acquire information or data sent by other devices or chips.

[0245] Optionally, the chip 600 may also include an output interface 640. The processor 610 can control the output interface 640 to communicate with other devices or chips, specifically, to output information or data to other devices or chips.

[0246] Optionally, the chip can be applied to the network device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0247] Optionally, the chip can be applied to the terminal device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0248] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0249] Figure 7 is a schematic block diagram of a communication system 700 provided in an embodiment of this application. As shown in Figure 7, the communication system 700 includes a terminal device 710 and a network device 720.

[0250] The terminal device 710 can be used to implement the corresponding functions implemented by the terminal device in the above method, and the network device 720 can be used to implement the corresponding functions implemented by the network device in the above method. For the sake of brevity, these will not be elaborated here.

[0251] It should be understood that the processor in the embodiments of this application may be an integrated circuit chip with signal processing capabilities. In implementation, the steps of the above method embodiments can be completed by integrated logic circuits in the processor's hardware or by instructions in software form. The processor described above can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method.

[0252] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDR SDRAM), Enhanced Synchronous DRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0253] It should be understood that the above-described memory is exemplary and not a limiting description. For example, the memory in the embodiments of this application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DR RAM), etc. That is to say, the memory in the embodiments of this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0254] This application also provides a computer-readable storage medium for storing computer programs.

[0255] Optionally, the computer-readable storage medium can be applied to the network device in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0256] Optionally, the computer-readable storage medium can be applied to the terminal device in the embodiments of this application, and the computer program causes the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0257] This application also provides a computer program product, including computer program instructions.

[0258] Optionally, the computer program product can be applied to the network device in the embodiments of this application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0259] Optionally, the computer program product can be applied to the terminal device in the embodiments of this application, and the computer program instructions cause the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, they will not be described in detail here.

[0260] This application also provides a computer program.

[0261] Optionally, the computer program can be applied to the network device in the embodiments of this application. When the computer program is run on the computer, it causes the computer to execute the corresponding processes implemented by the network device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0262] Optionally, the computer program can be applied to the terminal device in the embodiments of this application. When the computer program is run on the computer, it causes the computer to execute the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0263] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0264] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0265] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0266] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0267] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0268] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0269] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A communication method in a D2D system, characterized in that, include: The first terminal device sends first indication information through a first physical side-channel, the first indication information being used to determine the time slot structure of the cell where the first terminal device is located.

2. The method according to claim 1, characterized in that, The time slot structure of the cell where the first terminal device is located includes at least one set of the following information: Uplink timeslot information and / or uplink time domain symbol information; Downlink time slot information and / or downlink time domain symbol information; and Flexible time slot information and / or flexible time domain symbol information.

3. The method according to claim 1, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink time domain symbol information, downlink time slot information and / or downlink time domain symbol information, and flexible time slot information and / or flexible time domain symbol information; the first indication information includes at least two sets of the following information: Indication information used to determine uplink time slot information and / or uplink time domain symbol information; Indication information used to determine downlink time slot information and / or downlink time domain symbol information; as well as Indicative information used to determine flexible time slot information and / or flexible time domain symbol information.

4. The method according to claim 1, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink symbol information; the first indication information includes indication information for determining uplink time slot information and / or uplink time domain symbol information, but does not include indication information for determining downlink time slot information and / or downlink time domain symbol information.

5. The method according to claim 1, characterized in that, The first indication information is used to determine downlink time slot information and / or downlink symbol information; the first indication information includes indication information for determining downlink time slot information and / or downlink time domain symbol information, but does not include indication information for determining uplink time slot information and / or uplink time domain symbol information.

6. The method according to any one of claims 1 to 5, characterized in that, The first indication information is also used to determine at least one of the following: reference subcarrier spacing information; and periodic information.

7. The method according to any one of claims 1 to 6, characterized in that, The method further includes: The first terminal device receives configuration information sent by the network device; The first terminal device determines the first indication information based on the configuration information.

8. The method according to claim 7, characterized in that, The first terminal device determines the first indication information based on the configuration information, including: The first terminal device determines the first indication information based on the configuration information; wherein, The first indication information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Indication information used to determine uplink timeslot information; Indication information used to determine uplink time-domain symbol information; Indication information used to determine downlink time slot information; Indication information used to determine downlink time-domain symbol information; Indication information used to determine flexible time slot information; and Indication information used to determine flexible time-domain symbol information; The configuration information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Uplink timeslot count indication information; Uplink time domain symbol count indication information; Downlink timeslot count indication information; Downlink time-domain symbol count indication information; Flexible timeslot number indication information; and The number of flexible time-domain symbols indicates information.

9. The method according to claim 8, characterized in that, The value of the first indication information belongs to a first set; the value of the configuration information belongs to a second set or a third set, wherein the third set is a subset of the second set; and the first set is a subset of the second set.

10. The method according to any one of claims 1 to 9, characterized in that, The first terminal device transmits first indication information through a first physical side cross channel, including: The first terminal device transmits the first indication information through the Physical Side Broadcast Channel (PSBCH).

11. A communication method in a D2D system, characterized in that, include: The network device sends configuration information to the first terminal device, so that the first terminal device can determine the first indication information based on the configuration information and send the first indication information through the first physical side-channel; wherein, the first indication information is used to determine the time slot structure of the cell where the first terminal device is located.

12. The method according to claim 11, characterized in that, The time slot structure of the cell where the first terminal device is located includes at least one set of the following information: Uplink timeslot information and / or uplink time domain symbol information; Downlink time slot information and / or downlink time domain symbol information; and Flexible time slot information and / or flexible time domain symbol information.

13. The method according to claim 11, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink time domain symbol information, downlink time slot information and / or downlink time domain symbol information, and flexible time slot information and / or flexible time domain symbol information; the first indication information includes at least two sets of the following information: Indication information used to determine uplink time slot information and / or uplink time domain symbol information; Indication information used to determine downlink time slot information and / or downlink time domain symbol information; as well as Indicative information used to determine flexible time slot information and / or flexible time domain symbol information.

14. The method according to claim 11, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink symbol information; the first indication information includes indication information for determining uplink time slot information and / or uplink time domain symbol information, but does not include indication information for determining downlink time slot information and / or downlink time domain symbol information.

15. The method according to claim 11, characterized in that, The first indication information is used to determine downlink time slot information and / or downlink symbol information; the first indication information includes indication information for determining downlink time slot information and / or downlink time domain symbol information, but does not include indication information for determining uplink time slot information and / or uplink time domain symbol information.

16. The method according to any one of claims 11 to 15, characterized in that, The first indication information is also used to determine at least one of the following: reference subcarrier spacing information; and periodic information.

17. The method according to any one of claims 11 to 16, characterized in that, The first indication information is determined by the first terminal device based on the configuration information; wherein, The first indication information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Indication information used to determine uplink timeslot information; Indication information used to determine uplink time-domain symbol information; Indication information used to determine downlink time slot information; Indication information used to determine downlink time-domain symbol information; Indication information used to determine flexible time slot information; and Indication information used to determine flexible time-domain symbol information; The configuration information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Uplink timeslot count indication information; Uplink time domain symbol count indication information; Downlink timeslot count indication information; Downlink time-domain symbol count indication information; Flexible timeslot number indication information; and The number of flexible time-domain symbols indicates information.

18. The method according to claim 17, characterized in that, The value of the first indication information belongs to a first set; the value of the configuration information belongs to a second set or a third set, wherein the third set is a subset of the second set; and the first set is a subset of the second set.

19. A terminal device, characterized in that, include: An indication unit is used to send first indication information through a first physical side-channel, wherein the first indication information is used to determine the time slot structure of the cell where the terminal device is located.

20. The terminal device according to claim 19, characterized in that, The time slot structure of the cell where the first terminal device is located includes at least one set of the following information: Uplink timeslot information and / or uplink time domain symbol information; Downlink time slot information and / or downlink time domain symbol information; and Flexible time slot information and / or flexible time domain symbol information.

21. The terminal device according to claim 19, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink time domain symbol information, downlink time slot information and / or downlink time domain symbol information, and flexible time slot information and / or flexible time domain symbol information; the first indication information includes at least two sets of the following information: Indication information used to determine uplink time slot information and / or uplink time domain symbol information; Indication information used to determine downlink time slot information and / or downlink time domain symbol information; as well as Indicative information used to determine flexible time slot information and / or flexible time domain symbol information.

22. The terminal device according to claim 19, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink symbol information; the first indication information includes indication information for determining uplink time slot information and / or uplink time domain symbol information, but does not include indication information for determining downlink time slot information and / or downlink time domain symbol information.

23. The terminal device according to claim 19, characterized in that, The first indication information is used to determine downlink time slot information and / or downlink symbol information; the first indication information includes indication information for determining downlink time slot information and / or downlink time domain symbol information, but does not include indication information for determining uplink time slot information and / or uplink time domain symbol information.

24. The terminal device according to any one of claims 19 to 23, characterized in that, The first indication information is also used to determine at least one of the following: reference subcarrier spacing information; and periodic information.

25. The terminal device according to any one of claims 19 to 24, characterized in that, The indicating unit is also used for Receive configuration information sent by the network device; and determine the first indication information based on the configuration information.

26. The terminal device according to claim 25, characterized in that, The indicating unit is specifically used for Based on the configuration information, the first indication information is determined; wherein, The first indication information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Indication information used to determine uplink timeslot information; Indication information used to determine uplink time-domain symbol information; Indication information used to determine downlink time slot information; Indication information used to determine downlink time-domain symbol information; Indication information used to determine flexible time slot information; and Indication information used to determine flexible time-domain symbol information; The configuration information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Uplink timeslot count indication information; Uplink time domain symbol count indication information; Downlink timeslot count indication information; Downlink time-domain symbol count indication information; Flexible timeslot number indication information; and The number of flexible time-domain symbols indicates information.

27. The terminal device according to claim 26, characterized in that, The value of the first indication information belongs to a first set; the value of the configuration information belongs to a second set or a third set, wherein the third set is a subset of the second set; and the first set is a subset of the second set.

28. The terminal device according to any one of claims 19 to 27, characterized in that, The indicating unit is specifically used for The first indication information is transmitted via the Physical Side Broadcast Channel (PSBCH).

29. A network device, characterized in that, include: A configuration unit is configured to send configuration information to a first terminal device, so that the first terminal device can determine first indication information based on the configuration information and send the first indication information through a first physical side-channel; wherein, the first indication information is used to determine the time slot structure of the cell where the first terminal device is located.

30. The network device according to claim 29, characterized in that, The time slot structure of the cell where the first terminal device is located includes at least one set of the following information: Uplink timeslot information and / or uplink time domain symbol information; Downlink time slot information and / or downlink time domain symbol information; and Flexible time slot information and / or flexible time domain symbol information.

31. The network device according to claim 29, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink time domain symbol information, downlink time slot information and / or downlink time domain symbol information, and flexible time slot information and / or flexible time domain symbol information; the first indication information includes at least two sets of the following information: Indication information used to determine uplink time slot information and / or uplink time domain symbol information; Indication information used to determine downlink time slot information and / or downlink time domain symbol information; as well as Indicative information used to determine flexible time slot information and / or flexible time domain symbol information.

32. The network device according to claim 29, characterized in that, The first indication information is used to determine uplink time slot information and / or uplink symbol information; the first indication information includes indication information for determining uplink time slot information and / or uplink time domain symbol information, but does not include indication information for determining downlink time slot information and / or downlink time domain symbol information.

33. The network device according to claim 29, characterized in that, The first indication information is used to determine downlink time slot information and / or downlink symbol information; the first indication information includes indication information for determining downlink time slot information and / or downlink time domain symbol information, but does not include indication information for determining uplink time slot information and / or uplink time domain symbol information.

34. The network device according to any one of claims 29 to 33, characterized in that, The first indication information is also used to determine at least one of the following: reference subcarrier spacing information; and periodic information.

35. The network device according to any one of claims 29 to 34, characterized in that, The first indication information is determined by the first terminal device based on the configuration information; wherein, The first indication information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Indication information used to determine uplink timeslot information; Indication information used to determine uplink time-domain symbol information; Indication information used to determine downlink time slot information; Indication information used to determine downlink time-domain symbol information; Indication information used to determine flexible time slot information; and Indication information used to determine flexible time-domain symbol information; The configuration information includes at least one of the following: Reference subcarrier spacing information; Periodic information; Uplink timeslot count indication information; Uplink time domain symbol count indication information; Downlink timeslot count indication information; Downlink time-domain symbol count indication information; Flexible timeslot number indication information; and The number of flexible time-domain symbols indicates information.

36. The network device according to claim 35, characterized in that, The value of the first indication information belongs to a first set; the value of the configuration information belongs to a second set or a third set, wherein the third set is a subset of the second set; and the first set is a subset of the second set.

37. A communication device, characterized in that, include: A processor and a memory for storing a computer program, the processor for calling and running the computer program stored in the memory to perform the method as described in any one of claims 1 to 18.

38. A chip, characterized in that, include: A processor for retrieving and running a computer program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1 to 10.

39. A chip, characterized in that, include: A processor for retrieving and running a computer program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 11 to 18.

40. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the method as described in any one of claims 1 to 10.

41. A computer-readable storage medium, characterized in that, Used to store a computer program that causes a computer to perform the method as described in any one of claims 11 to 18.

42. A computer program product, characterized in that, It includes computer program instructions that cause a computer to perform the method as described in any one of claims 1 to 10.

43. A computer program product, characterized in that, It includes computer program instructions that cause a computer to perform the method as described in any one of claims 11 to 18.

44. A computer program, characterized in that, The computer program causes the computer to perform the method as described in any one of claims 1 to 10.

45. A computer program, characterized in that, The computer program causes the computer to perform the method as described in any one of claims 11 to 18.