System information acquisition method and device

Abstract

The present application provides a method and device for obtaining system information, which is helpful to solve the problem of high energy consumption of terminal devices in the process of obtaining system information in the prior art. The method includes: a first terminal device sends system information to a second terminal device, and the second terminal device receives the system information, and the system information is used for the second terminal device to communicate with the network device. Through this method, it is helpful to reduce the energy consumption of the second terminal device in the process of obtaining system information, and meet the energy saving requirements of the second terminal device.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a method and device for acquiring system information. Background Art

[0002] With the development of the Internet of Things and massive machine-type communications (mMTC) technology, terminal equipment (TE) has gradually shown characteristics such as large number and multiple forms in various application scenarios such as home, industry, and public places. For example, in an industrial automation scenario, there are a large number of monitoring devices (cameras), machines, sensors, etc. in the factory; in home and life scenarios, there are mobile phones, tablets, wearable devices, smart home appliances, and vehicle-mounted terminal equipment. With the increase in the number of terminal devices and application scenarios, how to reduce the power consumption of terminal devices has become an urgent problem to be solved. Summary of the invention

[0003] The embodiments of the present application provide a method and device for obtaining system information.

[0004] In a first aspect, an embodiment of the present application provides a method for acquiring system information, which can be executed by a second terminal device, or by other devices (such as a processor, a chip, or a chip system, etc.), which can be installed in the second terminal device or used in combination with the second terminal device. The method includes: receiving system information from a first terminal device, the system information being system information of a cell managed by a network device, and communicating with the network device according to the system information.

[0005] Through the above method, the second terminal device does not need to receive the system information of the cell from the network device, but can receive the system information of the cell managed by the network device from the first terminal device, which helps the second terminal device to obtain the system information with lower power consumption.

[0006] In a possible implementation, the method includes: directly communicating with the network device according to the system information.

[0007] In a possible implementation, the method includes: communicating with the network device through an uplink channel and / or a downlink channel between the second terminal device and the network device according to the system information.

[0008] In one possible implementation, the system information is carried on a sidelink data channel.

[0009] Through the above implementation method, the second terminal device can receive system information carried on the side link data channel, which helps the second terminal device to obtain system information with lower power consumption.

[0010] In one possible implementation, the method includes: receiving transmission parameter information of a sidelink data channel through a sidelink broadcast channel or a sidelink synchronization signal block, the transmission parameter information including parameters such as resource location, modulation and coding scheme of the sidelink data channel.

[0011] The above implementation method helps the second terminal device to obtain the transmission parameter information of the side link data channel with lower power consumption.

[0012] In one possible implementation, the transmission parameters of the sidelink data channel are predefined. Optionally, all of the transmission parameters of the sidelink data channel are predefined. Optionally, part of the transmission parameters of the sidelink data channel are predefined.

[0013] The above implementation method helps to save signaling and enables the second terminal device to obtain the transmission parameter information of the side link data channel with lower power consumption.

[0014] In one possible implementation, the method includes: receiving transmission parameter information of a sidelink data channel through a sidelink control channel.

[0015] Through the above implementation, the second terminal device can receive the transmission parameter information of the side link data channel carried on the side link control channel, which helps the second terminal device to receive the transmission parameter information of the side link data channel with lower power consumption.

[0016] In one possible implementation, the method includes: receiving a sidelink synchronization signal from a first terminal device, the sidelink synchronization signal being used to indicate a transmission parameter of a sidelink control channel. Optionally, a relative resource position of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource position includes a resource position in a time domain and / or a frequency domain.

[0017] Through the above implementation, the second terminal device can obtain the transmission parameters of the side link control channel according to the indication of the synchronization signal, which helps the second terminal device to receive the side link control channel with lower power consumption.

[0018] In a possible implementation, the method includes: receiving a transmission parameter of a sidelink control channel through a sidelink broadcast channel. Optionally, the transmission parameter includes a resource location, and the resource location includes a resource location in the time domain and / or the frequency domain.

[0019] The above implementation method helps the second terminal device to obtain the transmission parameter information of the side link control channel with lower power consumption.

[0020] In one possible implementation, the system information is carried on a sidelink broadcast channel.

[0021] Through the above implementation method, the second terminal device can receive system information carried on the side link broadcast channel, which helps the second terminal device to obtain system information with lower power consumption.

[0022] In one possible implementation, the transmission parameters of the sidelink broadcast channel are predefined. Optionally, all of the transmission parameters of the sidelink broadcast channel are predefined. Optionally, part of the transmission parameters of the sidelink broadcast channel are predefined.

[0023] The above implementation method helps to save signaling and enables the second terminal device to obtain the transmission parameter information of the side link broadcast channel with lower power consumption.

[0024] In one possible implementation, the system information is carried on a sidelink control channel. Optionally, transmission parameters of the sidelink control channel are predefined. Optionally, all transmission parameters of the sidelink control channel are predefined. Optionally, transmission parameters of the sidelink control channel are partially predefined.

[0025] Through the above implementation method, the second terminal device can receive system information carried on the side link control channel, which helps the second terminal device to obtain system information with lower power consumption.

[0026] In one possible implementation, the method includes: receiving a sidelink synchronization signal, the sidelink synchronization signal being used to indicate a transmission parameter of a sidelink control channel. Optionally, a relative resource position of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource position includes a resource position in a time domain and / or a frequency domain.

[0027] Through the above implementation, the second terminal device can obtain the transmission parameters of the side link control channel according to the indication of the synchronization signal, which helps the second terminal device to receive the side link control channel with lower power consumption.

[0028] In a second aspect, an embodiment of the present application provides a method for acquiring system information, which can be executed by a first terminal or by other devices (such as a processor, a chip, or a chip system, etc.), which can be installed in the first terminal device or used in combination with the first terminal device. The method includes: receiving system information from a network device, the system information being system information of a cell managed by the network device, and sending system information to a second terminal device, the system information being used for the second terminal device to communicate with the network device.

[0029] The method for sending system information to the second terminal device can refer to the corresponding description in the first aspect and will not be repeated here.

[0030] In a third aspect, an embodiment of the present application provides a communication method, which can be executed by a network device or by other devices (such as a processor, a chip, or a chip system, etc.), which can be installed in the network device or used in conjunction with the network device. The method includes: sending system information to a first terminal device, the system information being system information of a cell managed by the network device; and communicating with a second terminal device.

[0031] Optionally, the network device communicates directly with the second terminal device. Optionally, the network device communicates with the second terminal device via an uplink channel and / or a downlink channel between the second terminal device and the network device.

[0032] In a fourth aspect, an embodiment of the present application provides a side link synchronization signal transmission method, which can be performed by a second terminal device, or by other devices (such as a processor, a chip, or a chip system, etc.), which can be installed in the second terminal device or used in combination with the second terminal device. The method includes: receiving a side link synchronization signal from a first terminal device. Optionally, the time domain period of the side link synchronization signal is less than or equal to the time domain period of the synchronization signal sent by the network device. Optionally, the frequency domain grid of the side link synchronization signal is less than or equal to the frequency domain grid of the synchronization signal sent by the network device.

[0033] Through the above method, the time-frequency domain resource position of the side link synchronization signal can be denser than the time-frequency domain resource position of the synchronization signal sent by the network device to the terminal device, so the second terminal device can receive the side link synchronization signal with lower power consumption.

[0034] In a fifth aspect, an embodiment of the application provides a side link synchronization signal transmission method, which can be executed by a first terminal device, or by other devices (such as a processor, a chip, or a chip system, etc.), and the other devices can be installed in the first terminal device or used in combination with the first terminal device. The method includes: sending a side link synchronization signal to a second terminal device. Optionally, the time domain period of the side link synchronization signal is less than or equal to the time domain period of the synchronization signal sent by the network device. Optionally, the frequency domain grid of the side link synchronization signal is less than or equal to the frequency domain grid of the synchronization signal sent by the network device.

[0035] In a sixth aspect, a device is provided, which may be a second terminal device, or a device in the second terminal device, or a device that can be used in conjunction with the second terminal device. In one design, the device may include a module that performs the method / operation / step / action described in the first aspect or the fourth aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software.

[0036] In one design, the apparatus may include a receiving unit and a processing unit. The receiving unit is used to receive system information from a first terminal device, where the system information is system information of a cell managed by a network device; and the processing unit is used to communicate with the network device according to the system information.

[0037] The method for receiving system information from the first terminal device can refer to the corresponding description in the first aspect and will not be repeated here.

[0038] In a seventh aspect, a device is provided, which may be a first terminal device, or a device in the first terminal device, or a device that can be used in conjunction with the first terminal device. In one design, the device may include a module that performs the method / operation / step / action described in the second aspect or the fifth aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software.

[0039] In one design, the apparatus may include a receiving unit for receiving system information from a network device, wherein the system information is system information of a cell managed by the network device; and a sending unit for sending the system information to a second terminal device, wherein the system information is used for the second terminal device to communicate with the network device.

[0040] The method for sending system information to the second terminal device can refer to the corresponding description in the first aspect and will not be repeated here.

[0041] In an eighth aspect, a device is provided, which may be a network device, or a device in a network device, or a device that can be used in conjunction with a network device. In one design, the device may include a module that performs the method / operation / step / action described in the third aspect, and the module may be a hardware circuit, or software, or a combination of a hardware circuit and software.

[0042] In one design, the apparatus may include a sending unit, configured to: send system information to a first terminal device, where the system information is system information of a cell managed by a network device; and communicate with a second terminal device.

[0043] In a ninth aspect, an embodiment of the present application provides a device, comprising a processor for implementing the method described in the first aspect or the fourth aspect above. The device may also include a memory for storing instructions and data. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the method described in the first aspect or the fourth aspect above can be implemented. The device may also include a communication interface, and the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module or other type of communication interface, and the other device may be a network device or a first terminal device. In one possible device, the device includes:

[0044] The processor is used to utilize the communication interface to: receive system information from a first terminal device, where the system information is system information of a cell managed by a network device; and communicate with the network device according to the system information.

[0045] The method for receiving system information from the first terminal device can refer to the corresponding description in the first aspect and will not be repeated here.

[0046] In a tenth aspect, an embodiment of the present application provides a device, comprising a processor for implementing the method described in the second aspect or the fifth aspect above. The device may also include a memory for storing instructions and data. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the method described in the second aspect or the fifth aspect above can be implemented. The device may also include a communication interface, and the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module or other type of communication interface, and the other device may be a network device or a second terminal device. In one possible device, the device includes:

[0047] The processor is configured to use the communication interface to: receive system information from a network device, the system information being system information of a cell managed by the network device; and send the system information to a second terminal device, the system information being used for the second terminal device to communicate with the network device. The method for sending the system information to the second terminal device can refer to the corresponding description in the first aspect, which will not be repeated here.

[0048] In an eleventh aspect, an embodiment of the present application provides a device, comprising a processor for implementing the method described in the third aspect above. The device may also include a memory for storing instructions and data. The memory is coupled to the processor, and when the processor executes the instructions stored in the memory, the method described in the third aspect above can be implemented. The device may also include a communication interface, and the communication interface is used for the device to communicate with other devices. Exemplarily, the communication interface may be a transceiver, circuit, bus, module or other type of communication interface, and the other device may be a first terminal device or a second terminal device. In one possible device, the device includes:

[0049] The processor is used to use the communication interface to: send system information to the first terminal device, where the system information is system information of a cell managed by the network device; and communicate with the second terminal device.

[0050] In the twelfth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program or instructions stored thereon, which, when executed, causes the computer to execute the method described in the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, any possible design of the first aspect, any possible design of the second aspect, and any possible design of the third aspect.

[0051] In the thirteenth aspect, an embodiment of the present application provides a computer program product, which includes computer program code or instructions. When the computer program code or instructions are run on a computer, the computer executes the method described in the first aspect, the second aspect, the third aspect, the fourth aspect, the fifth aspect, any possible design of the first aspect, any possible design of the second aspect, and any possible design of the third aspect.

[0052] In the fourteenth aspect, an embodiment of the present application provides a chip, comprising: a processor, the processor being coupled to a memory, the processor being used to implement the method described in the above-mentioned first aspect, second aspect, third aspect, fourth aspect, fifth aspect, any possible design of the first aspect, any possible design of the second aspect, and any possible design of the third aspect.

[0053] In a fifteenth aspect, an embodiment of the present application provides a system, comprising: the apparatus described in the sixth aspect and the apparatus described in the seventh aspect. Optionally, the communication system may also include the apparatus described in the eighth aspect.

[0054] In a sixteenth aspect, an embodiment of the present application provides a system, comprising: the apparatus described in the ninth aspect and the apparatus described in the tenth aspect. Optionally, the communication system may also include the apparatus described in the eleventh aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 An example diagram of a communication system to which the embodiments of the present application can be applied;

[0056] Figure 2 An example diagram of the process of downlink synchronization between a terminal device and a network device and obtaining system information from the network device provided in an embodiment of the present application;

[0057] Figure 3 An example diagram of an interaction of a communication method provided in an embodiment of the present application;

[0058] FIG. 4A to FIG. 4D An example diagram of the time domain resource location of the physical side link shared channel provided in an embodiment of the present application.

[0059] FIG. 5A to FIG. 5B An example diagram of the relative relationship between the resource locations of the side link synchronization signal and the side link control channel provided in an embodiment of the present application;

[0060] Figure 6 An example diagram of a resource location of a sidelink synchronization signal provided in an embodiment of the present application;

[0061] Figure 7 A structural example diagram of a communication device provided in an embodiment of the present application;

[0062] Figure 8 An exemplary diagram of another communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0063] The technical solutions provided in the embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) system, fifth generation (5G) mobile communication system, wireless fidelity (WiFi) system, a system integrating multiple communication systems, a communication system evolving in the future, or other network systems that can be used to provide communication services, which are not limited in the embodiments of the present application. Among them, the 5G communication system can also be called a new radio (NR) system. Exemplarily, the technical solutions provided in the embodiments of the present application can be applied to communication scenarios such as device-to-device (D2D), machine type communication (MTC), vehicle to everything (V2X), vehicle to vehicle (V2V), Internet of Things (IoT), and massive machine-type communications (mMTC).

[0064] In communication scenarios, terminal equipment (TE) gradually presents characteristics such as large number and multiple forms. Among the multiple forms of terminal equipment, some terminal equipment is not sensitive to power consumption, such as machines with stable power supply, monitoring equipment, cars, and mobile phones with large battery capacity; some terminal equipment is more sensitive to power consumption and has low power consumption requirements because it is not easy to charge or pursues user experience, such as sensors, wearable devices, etc. The technical solution provided in the embodiment of the present application aims to reduce the power consumption of terminal equipment. It can be used for terminal equipment that is not sensitive to power consumption, such as pursuing user experience; it can also be used for terminal equipment that is sensitive to power consumption, such as to meet the low power consumption requirements of terminal equipment.

[0065] Figure 1 An example diagram of a communication system to which the technical solution provided in the embodiment of the present application can be applied is given. The communication system includes at least one network device (network device 100 is shown in the figure), and one or more terminal devices communicating with the network device (terminal device 110, terminal device 111, terminal device 112 and terminal device 113 are shown in the figure). Figure 1 The terminal device 110 shown in the figure can communicate with the network device 100; the terminal devices 111, 112 and 113 shown in the figure can communicate with the network device 100 through the terminal device 110. The network device and the terminal device can also be referred to as communication devices. Figure 1The number of terminal devices and network devices is only an example and is not limited in the embodiments of the present application.

[0066] In the embodiment of the present application, a terminal device used to cooperate with other terminal devices to communicate with a network device may be referred to as a cooperative terminal device (also referred to as a first terminal device, a source terminal device, a relay terminal device, or a cooperative user equipment (cooperation user equipment, CUE), etc.), for example Figure 1 The terminal device 110 in the figure may be a CUE; a terminal device that can communicate with a network device via a CUE may be referred to as a target terminal device (also referred to as a second terminal device, target user equipment (TUE)), for example Figure 1 The terminal devices 111, 112 and 113 in the figure may be TUEs. For example, the communication between the CUE and the TUE may be in the form of device-to-device (D2D) communication. D2D communication may include: user data may be transmitted directly between terminal devices without being transferred through network devices. For another example, the CUE and the TUE may communicate using a sidelink (SL). The sidelink is a link between terminal devices, and the sidelink may also be referred to as an edge link, a sidelink, a D2D link, or a V2X link.

[0067] In the embodiment of the present application, the terminal device 111, the terminal device 112 and the terminal device 113 can communicate with the network device 100 through the terminal device 110, which can be understood as: the terminal device 110 forwards all or part of the information of the network device 100 to the terminal device 111, the terminal device 112 and the terminal device 113. The sending mode used in the forwarding includes: unicast, multicast or broadcast.

[0068] In an embodiment of the present application, the communication between terminal devices (for example, between CUE and TUE) using the side link can be divided into: unicast, multicast and broadcast according to the communication mode. Unicast is a one-to-one communication mode between terminal devices, and the terminal device that can receive unicast data is a single terminal device. Multicast is a one-to-many communication mode between terminal devices, and the terminal devices that can receive multicast data are terminal devices in a specific group. Broadcast is a one-to-all communication mode between terminal devices, and terminal devices in a specific area around the sender can receive broadcast data.

[0069] In the embodiment of the present application, the network device may be a device with wireless transceiver function. Including but not limited to: base station, Node B, evolved Node B (eNB or e-NodeB) in LTE, base station in NR (such as next generation Node B (gNodeB or gNB), or transmission receiving point (TRP)), 3GPP (3 rd The base station may be a base station that is subsequently evolved from the third generation partnership project (3GPP), an access node in a WiFi system, a wireless relay node, a wireless backhaul node, etc. The base station may be a macro base station, a micro base station, a pico base station, a small station, a relay station, or a balloon station, etc., which is not limited in the embodiments of the present application. Optionally, a base station may include a TRP, or a base station may include multiple co-sited or non-co-sited TRPs. The network device may also be a wireless controller in a cloud radio access network (CRAN) scenario. The network device may also be a server, a wearable device, or an in-vehicle device, etc.

[0070] In the embodiment of the present application, the device for realizing the function of the network device may be a network device; or it may be a device capable of supporting the network device to realize the function, such as a chip system, which may be installed in the network device or used in combination with the network device. In the embodiment of the present application, the chip system may be composed of a chip, or may include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, the technical solution provided in the embodiment of the present application is described by taking the device for realizing the function of the network device as a network device as an example.

[0071] In an embodiment of the present application, the terminal device may be user equipment (UE), access terminal equipment, user unit, user station, mobile station, mobile station, remote station, remote terminal equipment, mobile device, user terminal equipment, terminal equipment, wireless terminal equipment, user agent or user device. The terminal device may also be a cellular phone, a cordless phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication function, a computing device, other processing devices connected to a wireless modem, a mobile phone, a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a vehicle-mounted terminal device, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, a wireless terminal device in smart home, a wearable terminal device, a terminal device in 5G network, or a terminal device in a public land mobile network (PLMN) to be evolved in the future, etc. The terminal device may be fixed or mobile. Terminal devices can be deployed on land, in water or in the air.

[0072] In the embodiments of the present application, the device for realizing the function of the terminal device may be the terminal device; or it may be a device capable of supporting the terminal device to realize the function, such as a chip system, which may be installed in the terminal device or used in combination with the terminal device. In the technical solution provided in the embodiments of the present application, the technical solution provided in the embodiments of the present application is described by taking the terminal device as an example of the device for realizing the function of the terminal device being the terminal device.

[0073] Optionally, in an embodiment of the present application, the network device may communicate directly with the terminal device, or may communicate with the terminal device through a relay station. The terminal device may communicate with multiple network devices of different technologies. For example, the terminal device may communicate with an LTE base station supporting an LTE network, or may communicate with a 5G base station supporting a 5G network, and may also support dual connections with an LTE base station and a 5G base station. Among them, the relay station may be a network device or another terminal device, which is not limited in the embodiment of the present application. In an embodiment of the present application, the plurality may be 2, 3, 4 or more, which is not limited in the embodiment of the present application.

[0074] In a wireless communication network, a network device can manage one or more (for example, 3, or 6, etc.) cells, and a terminal device can communicate with the network device in one or more (for example, 2, or 3, etc.) of the cells. When a terminal device wants to communicate with a network device, it can perform downlink synchronization with the network device, obtain system information from the network device, etc., and access the network device based on the system information, so that the terminal device can perform uplink and / or downlink data transmission with the network device. The terminal device obtaining system information from the network device can be regarded as the terminal device obtaining system information of the cell where the terminal device is located from the network device. The terminal device accessing the network device includes the terminal device establishing a link with the network device in the cell. The terminal device and the network device performing data transmission can be regarded as the terminal device performing data transmission with the network device in the cell.

[0075] Figure 2 An exemplary flow chart of the process of downlink synchronization between the terminal device and the network device and obtaining system information from the network device is given, including but not limited to:

[0076] Operation 201: A terminal device detects a synchronization signal and broadcast information from a network device.

[0077] Exemplarily, the network device sends a synchronization signal block (SSB) to the terminal device. The SSB includes a primary synchronized signal (PSS), a secondary synchronized signal (SSS) and a physical broadcast channel (PBCH). Among them, the synchronization signal is used for downlink synchronization between the terminal device and the network device. It can be a single signal or multiple separated signals (such as separated into PSS and SSS), which is not limited in the embodiments of the present application. PSS, SSS and PBCH can be sent in combination in the form of SSB or in a separated form, which is not limited in the embodiments of the present application.

[0078] The terminal device can perform downlink synchronization with the network device according to the synchronization signal. Optionally, the cell identifier of the terminal device can also be obtained.

[0079] Operation 202: The terminal device obtains system information according to the broadcast information.

[0080] PBCH can be used to carry master information block (MIB). MIB can be used to indicate resource configuration information of a common physical downlink control channel (PDCCH). Exemplarily, the resource configuration information of a common PDCCH includes a search space where the common PDCCH is located. The cyclic redundancy check (CRC) of the common PDCCH can be scrambled by a system information radio network temporary identifier (SI-RNTI). The PDSCH scheduled by the common PDCCH can be used to carry system information.

[0081] In the embodiment of the present application, the information carried on the PDCCH may be referred to as downlink control information (DCI). The DCI may be used to indicate the transmission parameters of the PDSCH, and the transmission parameters of the PDSCH may include one or more of the following: resource configuration information (such as configuration information of time domain resources and / or frequency domain resources), transport block size (TBS), modulation and coding scheme (MCS), and redundancy version (RV).

[0082] The terminal device can receive the MIB through the PBCH and obtain the resource configuration information of the public PDCCH through the MIB, such as the search space of the public PDCCH. The terminal device detects the public PDCCH in the search space, so that the transmission parameters of the PDSCH scheduled by the public PDCCH can be obtained. The terminal device receives the PDSCH according to the transmission parameters of the PDSCH, so that the system information can be received through the PDSCH.

[0083] In operation 201, when the terminal device detects the synchronization signal, it needs to try to retrieve from the possible sequence values ​​of the synchronization signal at the possible candidate resource position of the synchronization signal. This process can be called blind detection of the synchronization signal. Among them, the possible sequence values ​​of the synchronization signal include one or more sequence values. The blind detection process is a process of continuously receiving signals and multiple demodulation attempts, so the energy consumption is high. Therefore, how the terminal device can reduce energy consumption in the process of obtaining system information has become an urgent problem to be solved.

[0084] In the technical solution provided in the embodiment of the present application, through the cooperation of terminal devices, the CUE sends the system information of the cell managed by the network device to the TUE, so as to reduce the energy consumption of the TUE in the process of obtaining the system information.

[0085] The technical solution of the embodiments of the present application is described in detail below in conjunction with the accompanying drawings.

[0086] In the description of the embodiments of the present application, unless otherwise specified, " / " indicates that the objects associated before and after are in an "or" relationship, for example, A / B can represent A or B; "and / or" in the present application is a kind of association relationship describing the associated objects, indicating that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In addition, in order to facilitate the description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and the like can be used to distinguish the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not limit them to be necessarily different. At the same time, in the embodiments of the present application, the words "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design scheme described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or design schemes. The use of words such as “exemplary” or “for example” is intended to present the relevant concepts in a specific manner to facilitate understanding.

[0087] In the embodiment of the present application, the transmission between the network device and the terminal device may be bidirectional, for example, it may include the network device sending data to the terminal device, for example, sending downlink data via PDSCH); it may also include the terminal device sending data to the network device, for example, sending uplink data via PUSCH. The terminal device may be a CUE or a TUE.

[0088] Figure 3 An example diagram of an interaction of a communication method 300 provided in an embodiment of the present application. Figure 3In the example, the first terminal device, the second terminal device and the network device are used as the execution subjects of the interaction diagram to illustrate the communication method, but the embodiment of the present application does not limit the execution subjects of the interaction diagram. Figure 3 The network device in the method can be replaced by a device, module, chip, chip system, or processor that implements the method on the network device side. Figure 3 The first terminal device in the embodiment can be replaced by a device, module, chip, chip system, or processor that implements the method on the first terminal device side. It can be understood that Figure 3 The first terminal device is taken as an example for schematic illustration only. The first terminal device may be a CUE (such as a mobile phone), but the embodiments of the present application are not limited thereto. Figure 3 The second terminal device in the embodiment can be replaced by a device, module, chip, chip system, or processor that implements the method on the second terminal device side. It can be understood that Figure 3 The second terminal device is taken as an example for schematic illustration only. The second terminal device may be a TUE (such as a wearable device), but the embodiments of the present application are not limited thereto.

[0089] like Figure 3 As shown, method 300 may include:

[0090] Operation 301: A first terminal device receives system information from a network device, where the system information is system information of a cell managed by the network device.

[0091] The network device may manage one or more (e.g., 3, or 6, etc.) cells, and the system information received by the first terminal device from the network device may be system information of one or more (e.g., 2 or 3) cells managed by the network device. The system information received by the first terminal device from the network device may be system information of one or more (e.g., 2 or 3) cells where the first terminal device is located.

[0092] Optionally, the network device in operation 301 may also be replaced by another terminal device. When the network device is replaced by another terminal device, the first terminal device receives system information from the other terminal device, and the system information may be system information of the cell A where the other terminal device is located. For example, the other terminal device receives the system information of the cell A from the network device, and the other terminal device sends the system information of the cell A to the first terminal device.

[0093] The system information of the cell managed by the network device may include one or more of the following information: the network device identifier, the cell identifier, the system frame number, the subcarrier spacing, the common channel configuration parameters (such as one or more of the following parameters: uplink initial BWP parameters (such as one or more of the following parameters: subcarrier spacing, resource location, and bandwidth, etc.), downlink initial BWP parameters (such as one or more of the following parameters: subcarrier spacing, resource location, and bandwidth, etc.), public DCI search space, paging search space, sequence configuration of random access preamble, resource configuration of access preamble, supplementary uplink configuration and the period of sending synchronization signal blocks by the network device). Among them, the subcarrier spacing can be the subcarrier spacing of message 2 and message 4 during the initial access between the second terminal device and the network device, and / or the subcarrier spacing used when the network device broadcasts system information (SI).

[0094] Optionally, the introduction to the system information may refer to 3GPP standard protocols TS36.331 or TS38.331, but the embodiments of the present application are not limited thereto.

[0095] Operation 302: The first terminal device sends system information to the second terminal device; correspondingly, the second terminal device receives the system information. The first terminal device may send the system information to the second terminal device in a broadcast, multicast or unicast manner.

[0096] Exemplarily, the first terminal device receives the system information of cell B from the network device, and the first terminal device sends the system information of cell B to the second terminal device. Among them, cell B can be one cell or multiple cells, which is not limited in the embodiment of the present application. When the first terminal device sends the system information, it may be in cell B or not in cell B, which is not limited in the embodiment of the present application. For example, the first terminal device is not in cell B when sending the system information, but the first terminal device has accessed the network device in cell B. When the second terminal device receives the system information, it may be in cell B or not in cell B, which is not limited in the embodiment of the present application. For example, the second terminal device is not in cell B when receiving the system information, but the second terminal device can subsequently access the network device in cell B.

[0097] There may be many different understandings of the first terminal device sending system information to the second terminal device, including but not limited to the following two possible ways. In one possible way, the first terminal device forwards the system information to the second terminal device, for example, the first terminal device forwards the system information received by the first terminal device in operation 301 to the second terminal device. In another possible way, sending the system information may be understood as sending after preprocessing, for example, after the first terminal device preprocesses the system information received in operation 301, it sends the preprocessed system information to the second terminal device. The above-mentioned preprocessing may include one or more of the following operations: reassembly of information, scrambling, modulation, content reduction (such as reducing the information domain), content increase (such as increasing the information domain), content extraction (such as extracting the information domain), and physical resource mapping.

[0098] The system information sent by the first terminal device to the second terminal device can be used to indicate one or more of the following parameters: network device identification, cell identification, system frame number, subcarrier spacing, common channel configuration parameters (such as one or more of the following parameters: uplink initial BWP parameters (such as one or more of the following parameters: subcarrier spacing, resource location, and bandwidth, etc.), downlink initial BWP parameters (such as one or more of the following parameters: subcarrier spacing, resource location, and bandwidth, etc.), public DCI search space, paging search space, sequence configuration of random access preamble, resource configuration of access preamble, supplementary uplink configuration and the period of network device sending synchronization signal blocks). Among them, the subcarrier spacing can be the subcarrier spacing of message 2 and message 4 during the initial access between the second terminal device and the network device, and / or the subcarrier spacing used when the network device broadcasts system information (SI).

[0099] In an embodiment of the present application, in a possible implementation manner of preprocessing the system information sent to the second terminal device by the first terminal device, the system information sent by the first terminal device may only establish a primary mechanism. For example, the first terminal device sends a piece of information consisting of a master information block (MIB) and a system information block 1 (SIB1) in the system information of the network device to the second terminal device, which is not limited in the embodiment of the present application.

[0100] In a possible manner, the system information in operation 302 is carried on a sidelink data channel. The first terminal device sending the system information to the second terminal device includes: the first terminal device sending the system information to the second terminal device through the sidelink data channel.

[0101] The sidelink data channel includes a channel used to carry data information between terminals. The sidelink data channel can be, for example, a physical sidelink shared channel (PSSCH) or a physical sidelink discovery channel (PSDCH). The sidelink data channel can also be called an edge link data channel, a side link data channel, a D2D link data channel or other names, which is not limited by the embodiments of the present application.

[0102] In a possible manner, the system information in operation 302 is carried on a sidelink broadcast channel. The first terminal device sending the system information to the second terminal device includes: the first terminal device sending the system information to the second terminal device through the sidelink broadcast channel.

[0103] The sidelink broadcast channel includes a channel that carries broadcast information between terminals and / or sidelink system information. The sidelink broadcast channel can be, for example, a physical sidelink broadcast channel (PSBCH). The sidelink broadcast channel can also be called an edge link broadcast channel, a side link broadcast channel, a D2D link broadcast channel or other names, which are not limited in the embodiments of the present application.

[0104] In a possible manner, the system information in operation 302 is carried on a sidelink control channel. The first terminal device sending the system information to the second terminal device includes: the first terminal device sending the system information to the second terminal device through the sidelink control channel.

[0105] The sidelink control channel includes a channel used to carry control information between terminal devices. The sidelink control channel can be, for example, a physical sidelink control channel (PSCCH). The sidelink control channel can also be called an edge link control channel, a side link control channel, a D2D link control channel or other names, which are not limited in the embodiments of the present application.

[0106] Operation 303 : The second terminal device communicates with the network device in operation 301 according to the system information received from the first terminal device in operation 302 .

[0107] Exemplarily, the communication between the second terminal device and the network device may include the second terminal device acquiring the access resource configuration of the cell from the system information (e.g., one or more of the following configurations: initial uplink and downlink BWP, sequence configuration of random access preamble, resource configuration of access preamble, etc.), performing random access and other processes with the network device in the cell, and performing uplink or downlink data transmission with the network device after access. For example, the second terminal device receives downlink data from the network device via a physical downlink shared channel (PDSCH), and / or the second terminal device sends uplink data to the network device via a physical uplink shared channel (PUSCH).

[0108] Exemplarily, the communication between the second terminal device and the network device may include the second terminal device acquiring common channel configuration parameters from the system information for receiving a paging message sent by the network device. The communication may also include other communication processes between the second terminal device and the network device, which is not limited in this application.

[0109] In the embodiment of the present application, the communication between the second terminal device and the network device can also be understood as the direct communication between the second terminal device and the network device. The direct communication can be understood as the second terminal device communicating with the network device without the help of other network element devices, such as the first terminal device.

[0110] In the embodiment of the present application, the communication between the second terminal device and the network device can also be understood as the second terminal device communicating with the network device through the uplink channel and / or downlink channel between the second terminal device and the network device. For example, the second terminal device receives downlink data from the network device through the PDSCH, and / or the second terminal device sends uplink data to the network device through the PUSCH.

[0111] Through the above method 300, the first terminal and the second terminal cooperate through the terminal devices, and the first terminal device sends the system information of the cell managed by the network device to the second terminal device, thereby reducing the energy consumption of the second terminal in the process of obtaining the system information.

[0112] The following is a detailed description of a method for a first terminal device to send system information to a second terminal device.

[0113] System information transmission mode 1: System information is carried on the sidelink data channel.

[0114] Taking the side link data channel being PSSCH as an example, the second terminal device determines the transmission parameters of the PSSCH, receives the PSSCH according to the transmission parameters of the PSSCH, and thus can receive system information through the PSSCH.

[0115] Optionally, the transmission parameters of PSSCH may include one or more of the following parameters: time domain resource position, frequency domain resource position, frequency domain offset, demodulation reference signal information (such as demodulation reference signal position, symbol number, etc.), TBS, MCS, RV, frequency hopping flag, and transmit power control (transmit power control, TPC) command, etc. Optionally, the introduction of the transmission parameters of PSSCH can refer to the introduction of the transmission parameters of PSSCH in 3GPP standard protocols TS38.212 and TS38.331, or the introduction of the transmission parameters of PSSCH in 3GPP standard protocols TS36.212 and TS36.331, or the introduction of the transmission parameters of PDSCH or PUSCH in 3GPP standard protocols TS38.212 and / or TS36.212, or the introduction of the transmission parameters of PDSCH, PUSCH, and PSSCH in future 5G standard protocols, but the embodiments of the present application are not limited thereto. In an embodiment of the present application, the transmission parameters of a channel (such as PDCCH, PDSCH, PUSCH, PSSCH, PSCCH, etc.) are used to receive the channel, which can also be called the scheduling information of the channel or other names, and the embodiment of the present application is not limited.

[0116] Exemplarily, the frequency domain resource position of PSSCH can be used to indicate one or more of the following parameters: the offset of the frequency domain position of PSSCH relative to the frequency domain position of another channel (e.g., PSCCH, PSBCH, or sidelink synchronization signal) (e.g., the offset of the starting subcarrier of PSSCH relative to the starting subcarrier of PSCCH, the offset of the starting resource block (resourceblock, RB) of PSSCH relative to the starting RB of PSCCH), the starting frequency domain position of PSSCH (such as the starting subcarrier and / or the starting RB, etc.), the ending frequency domain position of PSSCH (such as the ending subcarrier and / or the ending RB, etc.), the length of PSSCH (such as the number of subcarriers and / or the number of RBs), etc.

[0117] Exemplarily, the time domain resource position of PSSCH can be used to indicate one or more of the following parameters: the offset of the time domain position of PSSCH relative to the time domain position of another channel (e.g., PSCCH, PSBCH, or side link synchronization signal) (e.g., the offset of the starting time slot of PSSCH relative to the starting time slot of PSCCH, the offset of the starting symbol of PSSCH relative to the starting symbol of PSCCH, etc.), the starting time domain position of PSSCH (such as the starting symbol index, and / or the starting time slot index, etc.), the ending time domain position of PSSCH (such as the ending symbol index, and / or the ending slot index, etc.), and the time domain length of PSCCH (e.g., the number of symbols, and / or the number of time slots), etc.

[0118] Exemplarily, the second terminal device may determine the transmission parameters of the PSSCH according to any one of the following three possible methods for determining the transmission parameters.

[0119] In a first possible transmission parameter determination method, the transmission parameters of the PSSCH may be predefined. The transmission parameters of the PSSCH are predefined, which may include that the transmission parameters of the PSSCH are predefined by a protocol, fixed, or pre-stored.

[0120] In a second possible method for determining transmission parameters, the first terminal device indicates the transmission parameters of the PSSCH to the second terminal device. Correspondingly, the second terminal device receives the transmission parameters of the PSSCH. For example, the first terminal device indicates the time-frequency resource position, TBS, MCS, frequency hopping indication and TPC of the PSSCH to the second terminal device.

[0121] In a third possible method for determining transmission parameters, some transmission parameters of the PSSCH are predefined, and some transmission parameters are indicated by the first terminal device. For example, the time domain resource position of the PSSCH is predefined, and the MCS, TBS, frequency domain resource position, frequency hopping indication, and TPC are indicated by the first terminal device. For another example, the MCS of the PSSCH is predefined, and the TBS, time-frequency resource position, frequency hopping indication, and TPC are indicated by the first terminal device. For another example, the TBS of the PSSCH is predefined, and the MCS, time-frequency resource position, frequency hopping indication, and TPC are indicated by the first terminal device. The embodiments of the present application are not limited to these three methods, and there may be other combinations.

[0122] Optionally, the first terminal device may indicate the transmission parameters of the PSSCH in any one of the following indication mode 1 and indication mode 2. This method may be applicable to the second possible design and the third possible design.

[0123] Indication method one: indicating one or more information fields to the second terminal device, where one information field among the one or more information fields is used to indicate one or more transmission parameters of the PSSCH.

[0124] Indication method two: indicating a transmission parameter value set from the candidate transmission parameter value set for the second terminal device, for example, indicating the index of the transmission parameter value set. The candidate transmission parameter value set includes one or more transmission parameter value sets, and one transmission parameter value set corresponds to an index. A transmission parameter value set corresponds to a value of a set of PSSCH transmission parameters. Exemplarily, as shown in Table 1, the candidate transmission parameter value set includes 3 transmission parameter value sets: transmission parameter value set 1, transmission parameter value set 2 and transmission parameter value set 3, with indexes of 0, 1 and 2 respectively. If the index indicated by the first terminal device to the second terminal device is 1, then in the transmission parameters of PSSCH: the value of TBS is TBS 2, the value of MCS is MCS 2, and the value of time-frequency resources is time-frequency resources 2.

[0125] Table 1

[0126] index TBS MCS Time-frequency resources Transmission parameter value set 1 0 TBS 1 MCS 1 Time and frequency resources 1 Transmission parameter value set 2 1 TBS 2 MCS 2 Time and frequency resources 2 Transmission parameter value set 3 2 TBS 3 MCS 3 Time and frequency resources 3

[0127] When the first terminal device indicates the transmission parameters of the PSSCH to the second terminal device, the first terminal device may send the transmission parameters of the PSSCH to the second terminal device in any one of Mode A1, Mode A2 and Mode A3.

[0128] Mode A1: The first terminal device indicates the transmission parameters of the PSSCH to the second terminal device via a sidelink control channel (eg, PSCCH).

[0129] Correspondingly, the second terminal device receives the transmission parameters of the PSSCH from the first terminal device via the sidelink control channel (eg, PSCCH). The second terminal device receives the PSSCH according to the transmission parameters of the PSSCH, and thus can receive system information via the PSSCH.

[0130] The second terminal device determines the transmission parameters of the PSCCH, and receives the PSCCH according to the transmission parameters of the PSCCH.

[0131] Optionally, the transmission parameters of the PSCCH may include one or more of the following parameters: the resource location to which the PSCCH is mapped (including the time domain resource location and / or the frequency domain resource location), the TBS of the PSCCH, the MCS of the PSCCH, a frequency hopping flag and a TPC.

[0132] Exemplarily, the implementation method of the second terminal device determining the transmission parameters of PSCCH is similar to the three possible transmission parameter determination methods described above (the first possible transmission parameter determination method to the third possible transmission parameter determination method), except that the PSSCH in the above three possible transmission parameter determination methods can be replaced by PSCCH.

[0133] When the first terminal device indicates the transmission parameters of the PSCCH to the second terminal device, the first terminal device may indicate the transmission parameters of the PSCCH to the second terminal device in any one of the methods B1 and B2.

[0134] Mode B1: The first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via a sidelink broadcast channel (eg, PSBCH).

[0135] Exemplarily, the second terminal device receives the resource location of the side link control channel (e.g., PSCCH) from the first terminal device via a side link broadcast channel (e.g., PSBCH), and the resource location may include a resource location in the time domain and / or frequency domain. Optionally, at least one of the TBS, MCS, frequency hopping indication, and TPC of the PSCCH may be predefined or indicated by the PSBCH. In an embodiment of the present application, at least one item may be one, two, or more items, which is not limited by the embodiment of the present application.

[0136] Method B2: The first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via a sidelink synchronized signal (SL-SS).

[0137] Exemplarily, the second terminal device receives the resource location of the sidelink control channel (e.g., PSCCH) from the first terminal device via the sidelink synchronization signal. The resource location may include a resource location in the time domain and / or frequency domain. Optionally, at least one of the TBS, MCS, frequency hopping indication, and TPC of the PSCCH may be predefined or indicated by the PSBCH.

[0138] When the synchronization signal is used to indicate the resource location of the PSCCH to the second terminal device, the first terminal device may indicate the resource location of the PSCCH to the second terminal device in any one of the methods C1, C2 and C3.

[0139] In an embodiment of the present application, SL-SS is used for sidelink synchronization between a first terminal device and a second terminal device, which may be one signal or multiple separated signals (such as separated into a sidelink primary synchronization signal (SL-PSS) and a sidelink secondary synchronization signal (SL-SSS)), which is not limited in the embodiment of the present application. Optionally, a sidelink synchronization signal block (SL-SSB) may include SL-PSS, SL-SSS and a first channel, wherein the first channel may be used to carry the transmission parameters of PSSCH. Optionally, the first channel may be PSBCH, or may be other channels. In the embodiment of the present application, the first channel is described as PSBCH as an example.

[0140] Exemplarily, SL-PSS, SL-SSS and PSBCH can be sent in combination in the form of SL-SSB, or in separate forms, which is not limited in the embodiments of the present application. In SL-SSB, the frequency domain resource positions of any two of SL-PSS, SL-SSS and PSBCH can be the same or different; the time domain resource positions of any two of SL-PSS, SL-SSS and PSBCH can be continuous (for example, mapped to continuous symbols) or discrete, which is not limited in the embodiments of the present application. For example, Figure 5B In the SL-SSB shown, PSBCH is in one symbol after SL-PSS, and PSBCH is in one symbol before SL-SSS.

[0141] Mode C1: SL-SS is used to indicate the PSCCH time domain resource location.

[0142] Optionally, the PSCCH frequency domain resource position may be predefined, or the PSCCH frequency domain resource position is indicated by the PSBCH.

[0143] Exemplarily, the relative time domain resource positions of the sidelink synchronization signal and the sidelink control channel are fixed. For example, the first terminal device sends SL-SS to the second terminal device at time unit n, and sends PSCCH to the second terminal device at time unit n+k. Wherein, n is an integer greater than or equal to 0, k is an integer (for example, k can be -2, -1, 0, 1, 2, which is not limited in the embodiments of the present application), and k can be predefined. In the embodiments of the present application, the time unit can be any one of the following time units: seconds, milliseconds, frames, subframes, transmission time intervals (TTI), time slots, and symbols.

[0144] Optionally, the relative relationship between the time domain symbol positions of the sidelink synchronization signal and the sidelink control channel is fixed. Optionally, the sidelink synchronization signal and the sidelink control channel are mapped to the same time slot or the same TTI.

[0145] For example, Figure 5A As shown, in the 14 symbols of a time slot, the 3rd and 9th symbols carry SL-PSS, the 5th and 11th symbols carry the sidelink auxiliary synchronization signal SL-SSS, the 4th and 6th symbols carry a PSCCH, and the 10th and 12th symbols carry a PSCCH. After the second terminal device receives the SL-SS from the first terminal device, it can determine the time domain resource location of the PSCCH based on the resource location of the SL-SS. It can be understood that the time domain resource location of the PSCCH and the synchronization signal is only an example, and the embodiments of the present application are not limited.

[0146] For example, Figure 5B As shown, the starting position of the time domain resources of PSCCH is in the fourth symbol after the SL-PSS time domain resource position.

[0147] Mode C2: SL-SS is used to indicate the PSCCH frequency domain resource location.

[0148] Optionally, the PSCCH time domain resource position may be predefined, or the PSCCH time domain resource position is indicated by the PSBCH.

[0149] Exemplarily, the relative frequency domain resource positions of the sidelink synchronization signal and the sidelink control channel are fixed. For example, the first terminal device sends SL-SS to the second terminal device on the frequency domain unit m, and sends PSCCH to the second terminal device on the frequency domain unit m+j. Wherein, m is an integer greater than or equal to 0, j is an integer (for example, j can be -2, -1, 0, 1, 2, which is not limited in the embodiments of the present application), and j can be predefined. In an embodiment of the present application, the frequency domain unit can be one or more of the following frequency domain units: subcarrier, resource block (resource block, RB), resource element (resource element, RE), and Hertz, etc.

[0150] Optionally, the relative relationship between the RB positions of the sidelink synchronization signal and the sidelink control channel is fixed.

[0151] For example, Figure 5A As shown, SL-SS and PSCCH are located at the same frequency domain position.

[0152] For example, Figure 5B As shown, the frequency domain resource position of PSCCH is the frequency domain position of SL-SS shifted by 20 RBs in the frequency domain forward direction. The frequency domain forward direction in the implementation of this application can be understood as the direction of increasing frequency.

[0153] Mode C3: SL-SS is used to indicate the PSCCH time domain and frequency domain resource locations.

[0154] Exemplarily, the relative resource positions of the sidelink synchronization signal and the sidelink control channel are fixed. For example, the first terminal device sends SL-SS to the second terminal device in time unit n1 and frequency domain unit m1, and sends PSCCH to the second terminal device in time unit n1+k1 and frequency domain unit m1+j1. Wherein, n1 and m1 are integers greater than or equal to 0, k1 and j1 are integers (for example, k1 and j1 can be -2, -1, 0, 1, 2, which are not limited in the embodiments of the present application), and k1 and j1 can be predefined. Wherein, the values ​​of n1 and m1 can be the same or different; the values ​​of k1 and j1 can be the same or different, which are not limited in the embodiments of the present application.

[0155] The relative resource locations of the sidelink synchronization signal and the sidelink control channel can be as follows: Figure 5A and Figure 5B As shown, the specific description can refer to the above-mentioned method C1 and method C2, which will not be repeated here.

[0156] Optionally, the SL-SS in the method in which the first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via the side link SL-SS may be replaced with SL-SSB to obtain a method in which the first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via the side link SL-SSB; the SL-SS in the method in which the first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via the side link SL-SS may be replaced with SL-PSS to obtain a method in which the first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via the side link SL-PSS; the SL-SS in the method in which the first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via the side link SL-SS may be replaced with SL-SSS to obtain a method in which the first terminal device indicates the transmission parameters of the PSCCH to the second terminal device via the side link SL-SSS.

[0157] Mode A2: The first terminal device indicates the transmission parameters of the PSSCH to the second terminal device via a sidelink broadcast channel (eg, PSBCH).

[0158] Correspondingly, the second terminal device receives the transmission parameters of the sidelink data channel through the sidelink broadcast channel, that is, the transmission parameters of the sidelink data channel are carried on the sidelink broadcast channel. The second terminal device receives the PSSCH according to the transmission parameters of the PSSCH, so that the system information can be received through the PSSCH.

[0159] Optionally, the PSBCH may indicate the resource location of the PSSCH through an information field carried in the PSBCH.

[0160] Optionally, the method in which the first terminal device indicates the resource location of PSSCH to the second terminal device through PSBCH is similar to the method in which the first terminal device indicates the resource location of PSCCH to the second terminal device through SL-SS described in B2 above. The PSCCH in B2 above may be replaced with PSSCH, and the SL-SS may be replaced with PSBCH.

[0161] Method A3: The first terminal device indicates the transmission parameters of the PSSCH to the second terminal device via the SL-SS.

[0162] Exemplarily, the second terminal device receives the resource location of the PSSCH from the first terminal device via the SL-SS. The resource location may include a resource location in the time domain and / or frequency domain, and optionally, at least one of the transmission parameters of the PSSCH, such as TBS, MCS and RV, may be predefined or indicated via the PSBCH.

[0163] Among them, the method in which the first terminal device indicates the resource location of PSSCH to the second terminal device through SL-SS is similar to the method in which the first terminal device indicates the resource location of PSCCH to the second terminal device through SL-SS described in the above B2, and the PSCCH in the above B2 needs to be replaced with PSSCH.

[0164] In the embodiment of the present application, the information carried by the PSCCH may be referred to as sidelink control information (SCI).

[0165] In the embodiment of the present application, the second terminal device may receive the system information block from the first terminal device in a variety of different ways. In the embodiment of the present application, the system information block may be defined as the complete system information sent by the first terminal device, and the system information block may be composed of a plurality of system information sub-blocks. The embodiment of the present application uses 12 system information sub-blocks to exemplify a system information block, but the embodiment of the present application is not limited thereto, and for example, other positive integers (e.g., 1, 2, 4, 6, etc.) of system information sub-blocks may constitute a system information block.

[0166] Figure 4A and Figure 4B The figure shows an example of the time domain resource location of PSSCH.

[0167] Figure 4A and 4B In the example, the boxes numbered 1 to 12 represent a system information block sent by the first terminal device to the second terminal device, and the system information block includes 12 system information sub-blocks. The 12 system information sub-blocks can be carried by one or more PSSCHs, which is not limited in the embodiment of the present application.

[0168] In one possible design, Figure 4A As shown, PSCCH indicates the time domain resource position of PSSCH, and the PSSCH carries the system information block. A group of PSCCH includes a positive integer number (e.g., four) of PSCCHs, and the group of PSCCHs can correspond to the same system information block, and the time domain position of the system information block is after the group of PSCCHs. Then, after the second terminal device receives one of the PSCCHs in the group, it can receive the PSSCH according to the transmission parameters of the PSSCH indicated by the PSCCH, thereby obtaining the system information block carried by the PSSCH. The embodiments of the present application are not limited to Figure 4A In the example shown, for example, in actual applications, other numbers of PSCCHs may be used to indicate a PSSCH, such as 1, 2, or other positive integers; the numbers of PSCCHs corresponding to different system information blocks may be the same or different, and the embodiment of the present application does not limit this. Figure 4CAs shown, the PSCCH in the method can also be replaced by SL-SS, SL-PSS, SL-SSS or PSBCH.

[0169] pass Figure 4A In the design shown, multiple PSCCHs correspond to one system information block, which can reduce the side link resource overhead.

[0170] In one possible design, Figure 4B As shown, the 12 sub-blocks in the system information block are arranged in sequence on a positive integer number (for example, 1, 2, 3, 4, 6, 12) of time units, and are sent in a certain pattern in the time domain, such as periodically and continuously repeated. PSCCH indicates the starting position of PSSCH, for example, indicating the offset of the time domain starting position of PSSCH relative to the time domain position of PSCCH. After the second terminal device receives the PSCCH, it can determine the starting position of PSSCH and receive PSSCH on a continuous positive integer number of time resources, thereby obtaining the system information block carried by PSSCH. Among them, the time unit can be seconds, milliseconds, frames, subframes, TTIs, time slots, symbols, etc., which are not limited in the embodiments of the present application. For example, Figure 4B In the method, the 12 sub-blocks in the system information block are arranged on 12 symbols in sequence. When the starting position of the PSSCH indicated by the PSCCH corresponds to system information sub-block No. 4, the second terminal device can receive system information sub-blocks No. 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2, and 3 in sequence to obtain a complete system information block. In this method, the number of time units in which the 12 sub-blocks in the system information block are located can be predefined, or can be sent from the first terminal device to the second terminal device, such as through PSCCH or PSBCH, which is not limited in the embodiments of the present application. The pattern of the 12 sub-blocks in the system information block in the time domain can be predefined, or can be sent from the first terminal device to the second terminal device, such as through PSCCH or PSBCH, which is not limited in the embodiments of the present application. Figure 4D As shown, the PSCCH in the method can also be replaced by SL-SS, SL-PSS, SL-SSS or PSBCH.

[0171] pass Figure 4B In the design shown, the system information block is sent in a certain pattern in the time domain, which can reduce the side link control signaling overhead of the first terminal device.

[0172] System information transmission mode 2: System information is carried on the side link control channel.

[0173] The second terminal device determines the transmission parameters of the side link control channel (PSCCH), receives the PSCCH according to the transmission parameters of the PSCCH, and thus can receive system information through the PSCCH.

[0174] Optionally, the implementation method for the second terminal device to determine the transmission parameters of the PSCCH is similar to the method for determining the transmission parameters of the PSCCH described in the above method A1.

[0175] System information transmission mode 3: System information is carried on the side link broadcast channel.

[0176] The second terminal device determines the transmission parameters of the PSBCH, and receives the PSBCH according to the transmission parameters of the PSBCH, so that the system information can be received through the PSBCH. Optionally, the transmission parameters of the PSBCH are predefined.

[0177] In the embodiment of the present application, in order to reduce power consumption, the first terminal device may send SL-SS to the second terminal device in a shorter time domain period. Figure 6 An example diagram of the resource location of a sidelink synchronization signal provided in an embodiment of the present application, wherein the time domain period of the SL-SS is less than or equal to the time domain period of the synchronization signal sent from the network device to the terminal device.

[0178] Optionally, the frequency domain resource positions of the SL-SS may be denser than the frequency domain resource positions of the synchronization signal sent from the network device to the terminal device. For example, the distance between the frequency domain positions of adjacent SL-SSs (SL-Raster, side link - grid) is less than or equal to the distance between the frequency domain positions of adjacent synchronization signals sent from the network device to the terminal device (raster, grid). For example, the frequency domain may include more SL-SSs.

[0179] Optionally, an independent SL-SS subcarrier spacing may be configured for each bandwidth or bandwidth part, and the SL-SS subcarrier spacing corresponding to different bandwidths or bandwidth parts may be the same or different, which is not limited in the embodiments of the present application.

[0180] Optionally, an independent SL-SS frequency domain interval (grid) may be configured for each frequency band, and the SL-SS frequency domain intervals (grids) corresponding to different frequency bands may be the same or different, which is not limited in the embodiments of the present application.

[0181] Optionally, an independent SL-SS time domain period may be configured for each frequency band, and the SL-SS time domains corresponding to different frequency bands may be the same or different, which is not limited in the embodiments of the present application.

[0182] In an embodiment of the present application, the three methods of transmitting system information described above can be used in combination, that is, the method of transmitting system information can be one or more of the three methods described above (a single method, a combination of two methods, a combination of three methods). For example, the system information is carried on the sidelink data channel. For another example, part of the system information is carried on the sidelink data channel, and part of it is carried on the sidelink control channel. For another example, part of the system information is carried on the sidelink data channel, part of it is carried on the sidelink control channel, and part of it is carried on the sidelink broadcast channel.

[0183] In an embodiment of the present application, there are multiple possible implementations for a terminal device to determine the type of the terminal (the terminal device is a first terminal device, or, is a second terminal device). In one possible manner, the type of the terminal device may be pre-configured in a subscriber identity module (SIM) card, for example, the terminal device may be configured as a first terminal device or a second terminal device in the SIM card. In one possible manner, different number segments are configured for the terminal device, for example, the first terminal device and the second terminal device use different number segments, and the terminal device determines the type of the terminal device based on the number segment. In one possible manner, the terminal device may determine itself as a first terminal device or a second terminal device.

[0184] Corresponding to the method provided in the above method embodiment, the present application embodiment also provides a corresponding device, including a module for executing the corresponding module of the above embodiment. The module can be software, hardware, or a combination of software and hardware.

[0185] The following, combined Figures 7 and 8 The device provided in the embodiment of the present application is described in detail. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, so the contents not described in detail can be referred to the method embodiment above, and some contents will not be repeated for the sake of brevity.

[0186] Figure 7 A communication device 700 of an embodiment of the present application is shown, and the communication device 700 may be the terminal device mentioned in the above embodiment or a device supporting the terminal device to implement the above method, or the communication device 700 may be the network device mentioned in the above embodiment or a device supporting the network device to implement the above method. The communication device 700 includes at least one processing unit 730, a receiving unit 710 and a sending unit 720.

[0187] It should be noted that the processing unit in the embodiment of the present application may be referred to as a processing module, the receiving unit may be referred to as a receiving module, and the sending unit may be referred to as a sending module. The receiving unit and the sending unit may also be referred to or integrated together as a transceiver unit.

[0188] In a possible design, the communication device 700 may correspond to the corresponding operation of the first terminal device in the above method, and the communication device 700 may include a unit for executing the method performed by the first terminal device in the above method. In addition, each unit in the communication device 700 and the above other operations and / or functions are respectively for implementing the corresponding process of the above method.

[0189] Exemplarily, the communication device 700 includes: a receiving unit 710, configured to receive system information from a network device, the system information being system information of a cell managed by the network device; a sending unit 720, configured to send the system information to a second terminal device. The communication device 700 may also include a processing unit 730, configured to process the received information and / or to generate information to be sent.

[0190] In a possible design, the communication device 700 may correspond to the corresponding operation of the second terminal device in the above method, and the communication device 700 may include a unit for executing the method performed by the second terminal device in the above method. In addition, each unit in the communication device 700 and the above other operations and / or functions are respectively for implementing the corresponding process of the above method.

[0191] Exemplarily, the communication apparatus 700 includes: a receiving unit 710, configured to receive system information from a first terminal device, where the system information is system information of a cell managed by a network device; and a processing unit 730, configured to communicate with the network device according to the system information.

[0192] In a possible design, the communication device 700 may correspond to the corresponding operation of the network device in the above method, and the communication device 700 may include a unit for executing the method executed by the network device in the above method. In addition, each unit in the communication device 700 and the above other operations and / or functions are respectively for implementing the corresponding process of the above method.

[0193] Exemplarily, the communication device 700 includes: a sending unit 720, configured to send system information to a first terminal device, the system information being system information of a cell managed by a network device. Optionally, a processing unit 730 and a receiving unit 710 are included for communicating with a second terminal device.

[0194] Optionally, corresponding to the above-mentioned possible designs, the communication device 700 may further include a storage unit 740. The storage unit 740 may be used to store computer-executable instructions and / or other information such as data. The processing unit 730 may read the instructions or data stored in the storage unit 740 to implement the corresponding solution.

[0195] In one possible design, the processing unit 730 may be a processor, such as Figure 8 The processor 801 shown. The sending unit 720 and the receiving unit 710 may also be a transceiver device, for example Figure 8 The transceiver 803 shown, or the sending unit 720 and the receiving unit 710 may also be a communication interface, a circuit or other device capable of implementing the transceiver function. The storage unit 740 may be a memory, for example Figure 8 Memory 802 is shown.

[0196] Based on the same technical concept, the embodiment of the present application also provides a communication device for implementing the functions performed by the network device, the first terminal device or the second terminal device in the above method embodiment. Figure 8 A schematic block diagram of a possible communication device 800 of an embodiment of the present application is shown. The communication device includes at least one processor 801, a memory 802, and optionally includes a transceiver 803 and a system bus 804. The bus 804 can be a PCI bus or an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 8 Only one thick line is used in the figure, but it does not mean that there is only one bus or one type of bus. The transceiver 803 is used for the communication device 800 to communicate and interact with other communication devices (such as wireless access network devices, or terminal devices, which are not limited here), such as interactive control signaling and / or business data, etc. The transceiver 803 can be implemented by a circuit with communication transceiver function, a communication interface, etc. The memory 802 is used to store required program instructions and / or data. When the at least one processor calls the program instruction stored in the memory to execute, the communication device implements the function of the first terminal device in the above method, or when the at least one processor calls the program instruction stored in the memory to execute, the communication device implements the function of the second terminal device in the above method, or when the at least one processor calls the program instruction stored in the memory to execute, the communication device implements the function of the network device in the above method. The at least one processor 801, the memory 802 and the transceiver 803 are coupled through the system bus 804.

[0197] In the embodiments of the present application, when there is no logical contradiction, the embodiments may reference each other, for example, the methods and / or terms between method embodiments may reference each other, for example, the functions and / or terms between device embodiments may reference each other, for example, the functions and / or terms between device embodiments and method embodiments may reference each other.

[0198] The processor and transceiver described in each embodiment of the present application can be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit RFIC, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (nMetal-oxide-semiconductor, NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (Bipolar Junction Transistor, BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc. Optionally, the processor may include one or more processors, for example, one or more CPUs, and in the case where the processor is a CPU, the CPU may be a single-core CPU or a multi-core CPU. The transceiver is used to send and receive data and / or signals, and receive data and / or signals. The transceiver may include a transmitter and a receiver, the transmitter is used to send data and / or signals, the receiver is used to receive data and / or signals, and the transceiver may also be a communication interface. The memory includes but is not limited to random access memory (RAM), read-only memory (ROM), erasable programmable read only memory (EPROM), and compact disc read-only memory (CD-ROM), and the memory is used to store relevant instructions and / or data.

[0199] Those skilled in the art will appreciate that the first, second, and other various digital numbers involved in the present application are only for the convenience of description and are not intended to limit the scope of the embodiments of the present application. The specific values ​​of the numbers (also referred to as indexes), the specific values ​​of the quantities, and the positions in the present application are only for illustrative purposes, are not the only form of representation, and are not intended to limit the scope of the embodiments of the present application. The first, second, and other various digital numbers involved in the present application are also only for the convenience of description and are not intended to limit the scope of the embodiments of the present application.

[0200] In this application, elements expressed in the singular are intended to mean "one or more" rather than "one and only one", unless otherwise specified. In this application, "at least one" is intended to mean "one or more", and "more than one" is intended to mean "two or more", unless otherwise specified.

[0201] In this document, the term "at least one of..." or "at least one of..." means all or any combination of the listed items. For example, "at least one of A, B, and C" may mean: A exists alone, B exists alone, C exists alone, A and B exist at the same time, B and C exist at the same time, and A, B, and C exist at the same time, where A may be singular or plural, B may be singular or plural, and C may be singular or plural.

[0202] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0203] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0204] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0205] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0206] In the method provided in the embodiment of the present application, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a server or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital video disc (DVD)), or a semiconductor medium (eg, an SSD), etc.

[0207] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A method for obtaining system information, applied to a second terminal device, characterized in that: include: Receiving system information from the first terminal device, where the system information is system information of a cell managed by the network device; communicating with the network device according to the system information; When the system information is carried on a sidelink data channel and a sidelink control channel is used to carry transmission parameter information of the sidelink data channel, a sidelink synchronization signal is received from the first terminal device to determine a resource location of the sidelink control channel through the sidelink synchronization signal, wherein the relative resource location of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource location includes a resource location in the time domain and / or a resource location in the frequency domain.

2. The method according to claim 1, characterized in that The method also includes: receiving transmission parameter information of the sidelink data channel through a sidelink broadcast channel or a sidelink synchronization signal block.

3. The method according to claim 1, characterized in that The transmission parameters of the sidelink control channel are received via the sidelink broadcast channel.

4. The method according to claim 1, characterized in that: The system information is carried on the side link broadcast channel.

5. The method according to claim 1, characterized in that The system information is carried on the sidelink control channel.

6. A method for obtaining system information, applied to a first terminal device, characterized in that: include: receiving system information from a network device, where the system information is system information of a cell managed by the network device; Sending the system information to a second terminal device, where the system information is used for the second terminal device to communicate with the network device; When the system information is carried on the sidelink data channel and the sidelink control channel is used to carry transmission parameter information of the sidelink data channel, a sidelink synchronization signal is sent to the second terminal device, so that the second terminal device determines the resource location of the sidelink control channel through the sidelink synchronization signal, and the relative resource location of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource location includes resource locations in the time domain and / or frequency domain.

7. The method according to claim 6, characterized in that The method also includes: sending transmission parameter information of the sidelink data channel through a sidelink broadcast channel or a sidelink synchronization signal block.

8. The method according to claim 6, characterized in that The transmission parameters of the sidelink control channel are sent through the sidelink broadcast channel.

9. The method according to claim 6, characterized in that The system information is carried on the side link broadcast channel.

10. The method according to claim 6, characterized in that The system information is carried on the sidelink control channel.

11. A communication device, characterized in that: include: A processor and a memory, wherein the processor is coupled to the memory, and the processor is configured to execute the method according to any one of claims 1 to 5.

12. A communication device, applied to a second terminal device, comprising: A receiving unit, configured to receive system information from a first terminal device, wherein the system information is system information of a cell managed by a network device; a processing unit, configured to communicate with the network device according to the system information; The receiving unit is also used to receive a sidelink synchronization signal from the first terminal device when the system information is carried on the sidelink data channel and the sidelink control channel is used to carry transmission parameter information of the sidelink data channel, so as to determine the resource location of the sidelink control channel through the sidelink synchronization signal, and the relative resource location of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource location includes resource locations in the time domain and / or the frequency domain.

13. A communication device, applied to a second terminal device, comprising: Processor and communication interface; The processor receives system information from the first terminal device using the communication interface, where the system information is system information of a cell managed by a network device; The processor also uses the communication interface to communicate with the network device according to the system information; The processor also utilizes the communication interface to receive a sidelink synchronization signal from the first terminal device when the system information is carried on the sidelink data channel and the sidelink control channel is used to carry transmission parameter information of the sidelink data channel, so as to determine the resource location of the sidelink control channel through the sidelink synchronization signal, and the relative resource location of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource location includes resource locations in the time domain and / or the frequency domain.

14. A communication device, characterized in that: include: A processor and a memory, wherein the processor is coupled to the memory, and the processor is configured to execute the method according to any one of claims 6 to 10.

15. A communication device, applied to a first terminal device, comprising: A receiving unit, configured to receive system information from a network device, wherein the system information is system information of a cell managed by the network device; A sending unit, configured to send the system information to a second terminal device, wherein the system information is used for the second terminal device to communicate with the network device; The sending unit is also used to send a sidelink synchronization signal to the second terminal device when the system information is carried on the sidelink data channel and the sidelink control channel is used to carry transmission parameter information of the sidelink data channel, so that the second terminal device determines the resource location of the sidelink control channel through the sidelink synchronization signal, and the relative resource location of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource location includes resource locations in the time domain and / or frequency domain.

16. A communication device, applied to a first terminal device, comprising: Processor and communication interface; The processor receives system information from a network device using the communication interface, where the system information is system information of a cell managed by the network device; The processor also uses the communication interface to send the system information to the second terminal device, where the system information is used for the second terminal device to communicate with the network device; The processor also uses the communication interface to send a sidelink synchronization signal to the second terminal device when the system information is carried on the sidelink data channel and the sidelink control channel is used to carry transmission parameter information of the sidelink data channel, so that the second terminal device determines the resource location of the sidelink control channel through the sidelink synchronization signal, and the relative resource location of the sidelink synchronization signal and the sidelink control channel is fixed, and the resource location includes resource locations in the time domain and / or frequency domain.

17. A computer-readable storage medium having a computer program or instruction stored thereon, which, when the computer program or instruction is executed on a computer, enables the computer to execute the method according to any one of claims 1 to 5 or the method according to any one of claims 6 to 10.

18. A computer program product, comprising a computer program or instructions, which, when executed on a computer, enables the computer to implement the method according to any one of claims 1 to 5 or the method according to any one of claims 6 to 10.

19. A communication system, characterized in that: The invention comprises the communication device according to any one of claims 11 to 13, and the communication device according to any one of claims 14 to 16.

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