Data transmission method and apparatus

Abstract

A data transmission method and an apparatus. The method comprises: receiving a first buffer status report (BSR) from a terminal device, the first BSR indicating the amount of data to be transmitted by the terminal device being 0; according to the first BSR, sending an uplink grant, the uplink grant indicating a first resource and a second resource; measuring a first power corresponding to the first resource; measuring a second power corresponding to the second resource, and on the second resource, detecting a demodulation reference signal (DMRS); and, according to the first power and the second power, determining that the terminal device has received the uplink grant. According to the method provided in the present application, terminal devices can achieve energy-saving effects, and network devices can correctly determine that the terminal devices are in states of having received uplink grants and being energy-saving, thus reducing the measuring complexity of the network devices.

Description

Data transmission method and device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on July 24, 2023, with application number 202310917702.5 and invention name “Data Transmission Method and Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and more particularly, to a data transmission method and apparatus. Background Art

[0003] With the development of fifth-generation (5G) new radio (NR) technology, network deployments and applications are expanding. These technologies offer higher-speed experiences and wider bandwidth access, lower latency and highly reliable information exchange, and larger-scale, low-cost access and management of machine-type communication devices. Consequently, the power consumption of communication devices is becoming increasingly prominent.

[0004] To minimize uplink scheduling delay, network devices will still send uplink grants (UL Grants) to terminal devices even if the terminal device has no data to send. If the terminal has no data, it will continue to send padding data to the network device, causing the terminal to waste power.

[0005] Therefore, it is necessary to optimize the data transmission method between the network device and the terminal device so that the network device can correctly detect that the terminal device has received the uplink authorization and is in an energy-saving state.

[0006] Summary of the Invention

[0007] The present application provides a data transmission method and apparatus, in which a terminal device does not send filler data but sends a pilot signal when there is no data to send, thereby achieving energy saving. The network device can correctly determine that the terminal device is in an uplink authorization receiving and energy saving state by detecting power or pilot signals, thereby reducing the complexity of network device detection.

[0008] In the first aspect, a data transmission method is provided, which can be executed by a network device, or by a module applied to the network device (such as a processor, chip, or chip system, etc.), or by a logical node, logical module or software that can realize all or part of the network device functions.

[0009] The method includes: receiving a first buffer status report BSR from a terminal device, the first BSR indicating that the amount of data to be transmitted of the terminal device is 0; sending an uplink authorization according to the first BSR, the uplink authorization indicating a first resource and a second resource; detecting a first power corresponding to the first resource; detecting a second power corresponding to the second resource, and detecting a demodulation reference signal DMRS on the second resource; and determining that the terminal device has received the uplink authorization based on the first power and the second power.

[0010] It should be noted that the first power corresponding to the first resource in this application can be understood as: the network device can determine a total power on the resources included in the first resource, and the first power can be the average power of this total power at each resource granularity, such as the resource element RE. The second power corresponding to the second resource can also be understood in this way. For the sake of simplicity of explanation, it will not be repeated later.

[0011] It should be understood that when the BSR indicates that the data to be transmitted of the terminal device is 0 and the terminal device does not send any data, the network device determines that the terminal device has received an uplink authorization based on the first power and the second power. Then, it can be determined that the terminal device has received an uplink authorization and has not sent any padding data, and is in an energy-saving state.

[0012] It should also be understood that only when DMRS is detected on the second resource will it be determined based on the first power and the second power that the terminal device has received the uplink authorization. When DMRS is not detected on the second resource, it can be considered that the terminal device has not received the uplink authorization and is in a discrete transmission DTX state.

[0013] According to the solution of the present application, the network device can correctly determine whether the terminal device is in an energy-saving state by detecting two powers, thereby reducing the complexity of network device detection.

[0014] In combination with the first aspect, in certain implementations of the first aspect, determining that the terminal device receives an uplink authorization based on the first power and the second power includes: determining a power difference based on the first power and the second power; and determining that the terminal device receives an uplink authorization based on the power difference.

[0015] In combination with the first aspect, in certain implementations of the first aspect, determining that the terminal device has received the uplink authorization based on the first power and the second power includes: when the power difference is greater than a first threshold, determining that the terminal device has received the uplink authorization.

[0016] It should be understood that, since different first thresholds can be set, the statement when the power difference is greater than or equal to the first threshold is also within the protection scope of this application.

[0017] That is, in combination with the first aspect, in certain implementations of the first aspect, determining that the terminal device has received the uplink authorization is based on the first power and the second power, including: when the power difference is greater than or equal to the first threshold, determining that the terminal device has received the uplink authorization.

[0018] Through the solution of the present application, when the network device detects that the terminal device has received an uplink authorization but has not sent data, it can be determined that no data retransmission is required and no downlink control channel PDCCH aggregation level adjustment is required, thereby ensuring downlink spectrum resource utilization.

[0019] In combination with the first aspect, in some implementations of the first aspect, the method further includes: sending first configuration information to the terminal device, where the first configuration information indicates the time domain and / or frequency domain position of the DMRS in the second resource.

[0020] According to the solution of the present application, the network device can further reduce the transmission energy consumption of the terminal device and improve the energy saving effect by instructing the terminal device to send DMRS at part of the time domain and / or frequency domain positions.

[0021] On the second aspect, a data transmission method is provided, which can be executed by a terminal device, or by a module applied to the terminal device (such as a processor, chip, or chip system, etc.), or by a logical node, logical module or software that can realize all or part of the terminal device functions.

[0022] The method includes: sending a first buffer status report BSR to a network device, where the first BSR indicates that the amount of data to be transmitted by the terminal device is 0; receiving an uplink authorization from the network device, where the uplink authorization indicates a first resource and a second resource; sending a demodulation reference signal DMRS to the network device on the second resource; and turning off symbols or reducing power on the first resource.

[0023] It should be noted that symbol power-off refers to disabling RF hardware such as the power amplifier during time-domain symbols where no data is being transmitted, thereby reducing static power consumption. Power reduction refers to adjusting transmit power to reduce transmit power and thus power consumption. Therefore, powering off symbols or reducing power on a first resource can also mean not transmitting data on the first resource, or in other words, saving energy on the first resource.

[0024] Through the solution of the present application, when there is no data to be transmitted, the terminal device does not send padding data but sends pilot symbols, which can achieve energy saving.

[0025] When there is no data to be transmitted, the terminal device does not send padding data, but sends pilot symbols, which can be called the terminal device entering an energy-saving state. This state can be correctly detected and identified by the network device through the method provided by the above-mentioned first aspect and corresponding implementation method.

[0026] In combination with the second aspect, in some implementations of the second aspect, the method further includes: receiving first configuration information from a network device, where the first configuration information indicates a time domain and / or frequency domain position of the DMRS in the second resource.

[0027] In a possible implementation manner, the second resource includes at least one time domain symbol, and sending the pilot signal on the second resource includes: sending the pilot signal on one time domain symbol.

[0028] In a possible implementation, the second resource includes multiple frequency domain resources, and sending the pilot signal on the second resource includes: sending the pilot signal on some frequency domain resources.

[0029] In combination with the second aspect, in certain implementations of the second aspect, sending a demodulation reference signal DMRS to the network device on the second resource includes: when the number of uplink authorizations corresponding to the first BSR indicating that the amount of data to be transmitted is 0 is greater than a second threshold, sending the DMRS to the network device on the second resource.

[0030] It should be understood that since different second thresholds can be set, expressions where the quantity is greater than or equal to the second threshold also fall within the protection scope of this application.

[0031] That is, in combination with the second aspect, in certain implementations of the second aspect, sending a demodulation reference signal DMRS to the network device on the second resource includes: when the number of uplink authorizations corresponding to the first BSR indicating that the amount of data to be transmitted is 0 is greater than or equal to a second threshold, sending the DMRS to the network device on the second resource.

[0032] It should be noted that the uplink authorization corresponding to the first BSR indicating the amount of data to be transmitted is 0 in this application refers to the uplink authorization received when the BSR indicating the amount of data to be transmitted is 0 is sent, and will not be repeated later.

[0033] In other words, the terminal device counts the number of times it receives uplink authorization, and when the number of times no data is sent corresponding to the uplink authorization reaches a second threshold, the terminal device sends a DMRS.

[0034] In combination with the second aspect, in some implementations of the second aspect, the method further includes: receiving second configuration information from the network device, where the second configuration information indicates a second threshold.

[0035] On the third aspect, a data transmission method is provided, which can be executed by a network device, or by a module applied to the network device (such as a processor, chip, or chip system, etc.), or by a logical node, logical module or software that can realize all or part of the network device functions.

[0036] The method includes: receiving a second buffer status report BSR from a terminal device, the second BSR indicating that the amount of data to be transmitted of the terminal device is 0; sending scheduling information according to the second BSR, the scheduling information including indication information, the indication information indicating the sending of a sounding reference signal SRS on a third resource; detecting the SRS on the third resource, and determining whether the scheduling information is received.

[0037] The scheduling information may be an uplink grant UL Grant or a downlink resource scheduling DL Grant.

[0038] According to the solution of the present application, the network device can correctly determine that the terminal device is in an energy-saving state by detecting the triggered SRS, thereby reducing the complexity of network device detection.

[0039] In combination with the third aspect, in certain implementations of the third aspect, SRS is detected on the third resource, and it is determined whether the scheduling information is received, including: when SRS is detected on the third resource, determining that the scheduling information is received; when SRS is not detected on the third resource, determining that the scheduling information is not received.

[0040] According to the solution of the present application, when the network device detects that the terminal device receives an uplink authorization but does not send data, it can be determined that no data retransmission is required and no downlink control channel PDCCH aggregation level adjustment is required, thereby ensuring downlink spectrum resource utilization.

[0041] In the fourth aspect, a data transmission method is provided, which can be executed by a terminal device, or by a module applied to the terminal device (such as a processor, chip, or chip system, etc.), or by a logical node, logical module or software that can realize all or part of the terminal device functions.

[0042] The method includes: sending a second buffer status report BSR to a network device, the second BSR indicating that the amount of data to be transmitted of the terminal device is 0; receiving scheduling information from the network device, the scheduling information including indication information, the indication information indicating the sending of a sounding reference signal SRS on a third resource; and sending the SRS according to the indication information.

[0043] In a fifth aspect, a data transmission apparatus is provided, the apparatus comprising: an interface unit configured to receive a first buffer status report (BSR) from a terminal device, the first BSR indicating that the amount of data to be transmitted by the terminal device is 0; and send an uplink grant according to the first BSR, the uplink grant indicating a first resource and a second resource.

[0044] The device also includes: a processing unit, configured to detect a first power corresponding to a first resource; detect a second power corresponding to a second resource, and detect a demodulation reference signal DMRS on the second resource; and determine that the terminal device receives an uplink authorization based on the first power and the second power.

[0045] In combination with the fifth aspect, in certain implementations of the fifth aspect, the processing unit is specifically used to: determine a power difference based on the first power and the second power; and determine that the terminal device receives an uplink authorization based on the power difference.

[0046] In combination with the fifth aspect, in certain implementations of the fifth aspect, the processing unit is specifically used to: when the power difference is greater than a first threshold, determine that the terminal device receives an uplink authorization.

[0047] In combination with the fifth aspect, in certain implementations of the fifth aspect, the interface unit is further used to: send first configuration information to the terminal device, where the first configuration information indicates the time domain and / or frequency domain position of the DMRS in the second resource.

[0048] In the sixth aspect, a data transmission device is provided, which includes: an interface unit for sending a first buffer status report BSR to a network device, the first BSR indicating that the amount of data to be transmitted by the terminal device is 0; receiving an uplink authorization from the network device, the uplink authorization indicating a first resource and a second resource; sending a demodulation reference signal DMRS to the network device on the second resource; and a processing unit for turning off symbols or reducing power on the first resource.

[0049] In combination with the sixth aspect, in certain implementations of the sixth aspect, the interface unit is further used to: receive first configuration information from the network device, where the first configuration information indicates the time domain and / or frequency domain position of the DMRS in the second resource.

[0050] In combination with the sixth aspect, in certain implementations of the sixth aspect, the interface unit is specifically used to: when the number of uplink authorizations corresponding to the first BSR indicating that the amount of data to be transmitted is 0 is greater than the second threshold, send DMRS to the network device on the second resource.

[0051] In combination with the sixth aspect, in some implementations of the sixth aspect, the interface unit is further used to: receive second configuration information from the network device, where the second configuration information indicates a second threshold.

[0052] In the seventh aspect, a data transmission device is provided, which includes: an interface unit for receiving a second cache status report BSR from a terminal device, the second BSR indicating that the amount of data to be transmitted of the terminal device is 0; sending scheduling information according to the second BSR, the scheduling information including indication information, the indication information indicating the sending of a sounding reference signal SRS on a third resource; a processing unit for detecting the SRS on the third resource and determining whether the scheduling information is received.

[0053] In combination with the seventh aspect, in certain implementations of the seventh aspect, the processing unit is specifically used to: when SRS is detected on the third resource, determine that the scheduling information is received; when SRS is not detected on the third resource, determine that the scheduling information is not received.

[0054] In the eighth aspect, a data transmission device is provided, which includes: an interface unit for sending a second cache status report BSR to a network device, wherein the second BSR indicates that the amount of data to be transmitted of the terminal device is 0; receiving scheduling information from the network device, wherein the scheduling information includes indication information, and the indication information indicates the sending of a sounding reference signal SRS on a third resource; and sending the SRS according to the indication information.

[0055] In the ninth aspect, a device for data transmission is provided, which may be a network device, a component of a network device (such as a processor, a chip, or a chip system), or a logical node, a logical module, or software that can implement all or part of the functions of the network device. The device has the function of implementing the above-mentioned first aspect and various possible implementations of the first aspect or the third aspect and various possible implementations of the third aspect. The function can be implemented by hardware or by executing corresponding software implementations by hardware. The hardware or software includes one or more modules corresponding to the above-mentioned functions.

[0056] In one possible design, the device includes: an interface unit, which may be at least one of a transceiver, a receiver, and a transmitter, and the interface unit may include a radio frequency circuit or an antenna. Optionally, the device also includes a processing unit, which may be a processor. Optionally, the device also includes a storage unit, which may be, for example, a memory. When a storage unit is included, the storage unit is used to store programs or instructions. The processing unit is connected to the storage unit, and the processing unit may execute the programs, instructions, or instructions derived from other sources stored in the storage unit, so that the device executes the communication method of the above-mentioned first aspect and various possible implementations of the first aspect or the third aspect and various possible implementations of the third aspect. In this design, the device may be a network device.

[0057] In another possible design, when the device is a chip, the chip includes: an interface unit and a processing unit, and the interface unit can be, for example, an input / output interface, a pin or a circuit on the chip. The processing unit can be, for example, a processor. The processing unit can execute instructions so that the chip in the network device executes the communication method of the first aspect and any possible implementation of the first aspect or the third aspect and various possible implementations of the third aspect. Optionally, the processing unit can execute instructions in a storage unit, and the storage unit can be a storage module in the chip, such as a register, a cache, etc. The storage unit can also be located in the communication device but outside the chip, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0058] Among them, the processor mentioned in any of the above places can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the above-mentioned first or third aspect communication method.

[0059] In the tenth aspect, a device for data transmission is provided, which may be a terminal device, a component of a terminal device (such as a processor, a chip, or a chip system), or a logical node, a logical module, or software that can implement all or part of the functions of the terminal device. The device has the function of implementing the above-mentioned second aspect and various possible implementations of the second aspect or the fourth aspect and various possible implementations of the fourth aspect. The function can be implemented by hardware or by executing corresponding software implementations through hardware. The hardware or software includes one or more modules corresponding to the above-mentioned functions.

[0060] In one possible design, the device includes: an interface unit, which may be at least one of a transceiver, a receiver, and a transmitter, and the interface unit may include a radio frequency circuit or an antenna. Optionally, the device also includes a processing unit, which may be a processor. Optionally, the device also includes a storage unit, which may be, for example, a memory. When a storage unit is included, the storage unit is used to store programs or instructions. The processing unit is connected to the storage unit, and the processing unit may execute the programs, instructions, or instructions derived from other sources stored in the storage unit, so that the device executes the communication method of the above-mentioned second aspect and possible implementations of the second aspect or the fourth aspect and various possible implementations of the fourth aspect. In this design, the device may be a terminal device.

[0061] In another possible design, when the device is a chip, the chip includes: an interface unit and a processing unit, and the interface unit can be, for example, an input / output interface, a pin or a circuit on the chip. The processing unit can be, for example, a processor. The processing unit can execute instructions so that the chip in the network device executes the communication method of the second aspect and any possible implementation of the second aspect or the fourth aspect and various possible implementations of the fourth aspect. Optionally, the processing unit can execute instructions in a storage unit, and the storage unit can be a storage module in the chip, such as a register, a cache, etc. The storage unit can also be located in the communication device but outside the chip, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0062] Among them, the processor mentioned in any of the above places can be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the above-mentioned second or fourth aspect communication method.

[0063] In an eleventh aspect, a communication system is provided, comprising the communication device provided in the fifth or seventh aspect and the communication apparatus provided in the sixth or eighth aspect. The communication system can implement the data transmission method provided in any possible implementation of the first to fourth aspects or any of the first to fourth aspects.

[0064] In the twelfth aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is run on a computer, the computer is caused to execute instructions of the method of any possible implementation of the above-mentioned first to fourth aspects or the first to fourth aspects.

[0065] In the thirteenth aspect, a chip is provided, comprising: a processing unit, which can execute instructions to enable the method of any possible implementation of the above-mentioned first to fourth aspects or the first to fourth aspects to be executed.

[0066] In a fourteenth aspect, a computer program product is provided, which includes a computer program code, which, when the computer program code is run, is used to execute instructions of the method of any possible implementation of the above-mentioned first to fourth aspects or the first to fourth aspects.

[0067] In the fifteenth aspect, a chip system is provided, comprising a memory and a processor, wherein the memory is used to store instructions, and the processor is used to call and execute the instructions from the memory, so that the methods in the above-mentioned first to fourth aspects and their possible implementation methods are executed.

[0068] Among them, the chip system may include an input circuit or interface for sending information or data, and an output circuit or interface for receiving information or data.

[0069] Specifically, the beneficial effects of other aspects can refer to the beneficial effects described in the first and second aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] FIG1 is a schematic diagram of a possible system applicable to an embodiment of the present application;

[0071] FIG2 is a schematic diagram of a possible data transmission;

[0072] FIG3 is a schematic diagram of a possible data transmission scenario;

[0073] FIG4 is a flow chart of a data transmission method provided in an embodiment of the present application;

[0074] Figures 5-7 are schematic diagrams of several network device detection processes provided in embodiments of the present application;

[0075] FIG8 is a flow chart of another data transmission method provided in an embodiment of the present application;

[0076] FIG9 is a schematic diagram of another network device detection process provided in an embodiment of the present application;

[0077] 10-12 are schematic block diagrams of several communication devices provided in this application. DETAILED DESCRIPTION

[0078] The technical solution in this application will be described below with reference to the accompanying drawings.

[0079] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), LTE system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, universal mobile telecommunication system (UMTS), world-wide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR) and other evolved communication systems, vehicle-to-other devices (V2X), where V2X can include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2I), and vehicle to pedestrian (V2P), long term evolution-vehicle (LTE-V), Internet of Vehicles, machine type communication (MTC), Internet of Things (IoT), long term evolution-machine (LTE-M), machine to machine (M2M), device to device (D2D), etc.

[0080] The terminal device in the embodiments of the present application may refer to user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device may also be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a 5G network or a terminal device in an evolved public land mobile network (PLMN), etc., and the embodiments of the present application are not limited to this. For example, the terminal device can be an on-board device, a complete vehicle device, an on-board module, a vehicle, an on-board unit (OBU), a roadside unit (RSU), a telematics box (T-box), a chip or a system on chip (SOC), etc. The above chip or SOC can be installed in a vehicle, OBU, RSU or T-box.

[0081] The terminal devices involved in the embodiments of the present application also include at least one of user equipment, augmented reality AR / virtual reality VR / extended reality XR devices, wearable devices, smart home appliance terminals, terminal devices and communication modules of terminal devices, mobile phones and communication modules in mobile phones, vehicles and communication modules in vehicles, information processing equipment, display devices, network devices, base stations, TRPs, customer premise equipment (CPE), routers, network access devices, etc. Considering Uu (UTRAN-to-terminal equipment) air interface transmission, the two parties of wireless communication include network devices and user communication equipment; considering SL air interface transmission, the transceiver ends of wireless communication are both user communication equipment. The network device can be a traditional macro base station eNB in ​​a traditional UMTS / LTE wireless communication system, a micro base station eNB in ​​a heterogeneous network (HetNet) scenario, a baseband processing unit (BBU) and a remote radio unit (RRU) in a distributed base station scenario, a baseband pool BBU pool and a radio frequency unit RRU in a CRAN scenario, and a gNB in ​​a wireless communication system.

[0082] In the embodiment of the present application, the network device can be any device with wireless transceiver function. The device includes but is not limited to: an evolved Node B (eNB), a radio network controller (RNC), a Node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (e.g., a home evolved NodeB, or a home Node B, HNB), a baseband unit (BBU), an access point (AP) in a wireless fidelity (WiFi) system, a wireless relay node, a wireless backhaul node, a transmission point (TP) or a transmission and reception point (TRP), etc. It can also be a gNB in ​​a 5G, such as NR, system, or a transmission point (TRP or TP), one or a group of antenna panels (including multiple antenna panels) of a base station in a 5G system, or a network node constituting a gNB or a transmission point, such as a baseband unit (BBU) or a distributed unit (DU), etc.

[0083] In some deployments, a gNB may include a centralized unit (CU) and a DU. The gNB may also include an active antenna unit (AAU). The CU implements some gNB functions, while the DU implements some gNB functions. For example, the CU is responsible for processing non-real-time protocols and services, and implementing the functions of the radio resource control (RRC) and packet data convergence protocol (PDCP) layers. The DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC), medium access control (MAC), and physical (PHY) layers. The AAU implements some physical layer processing functions, RF processing, and active antenna-related functions. Because RRC layer information ultimately becomes PHY layer information, or is converted from PHY layer information, in this architecture, higher-layer signaling, such as RRC layer signaling, can also be considered to be sent by the DU, or by both the DU and the AAU. It is understood that a network device can be a device that includes one or more of a CU node, a DU node, or an AAU node. In addition, the CU may be classified as a network device in an access network (radio access network, RAN), or may be classified as a network device in a core network (core network, CN), which is not limited in this application.

[0084] Network equipment provides services for cells, and terminal devices communicate with cells through transmission resources allocated by the network equipment (for example, frequency domain resources, or spectrum resources). The cell can belong to a macro base station (for example, a macro eNB or macro gNB), or to a base station corresponding to a small cell. Small cells here can include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0085] FIG1 is a schematic diagram of a possible, non-limiting system suitable for embodiments of the present application.

[0086] As shown in Figure 1 , the communications system includes a radio access network (RAN) 100. RAN 100 includes at least one RAN node (e.g., 110a and 110b in Figure 1 , collectively referred to as 110) and at least one terminal device (e.g., 120a-120j in Figure 1 , collectively referred to as 120). RAN 100 may also include other RAN nodes, such as wireless relay devices and / or wireless backhaul devices (not shown in Figure 1 ). Terminal 120 is wirelessly connected to RAN node 110. RAN node 110 is wirelessly or wiredly connected to core network 200. The core network devices in core network 200 and RAN node 110 in RAN 100 may be separate physical devices, or they may be the same physical device that integrates core network logical functions and radio access network logical functions.

[0087] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a 4G or 5G mobile communication system, or a future-oriented evolutionary system (such as a 6G mobile communication system). The RAN 100 may also be an open access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. The RAN 100 may also be a communication system that integrates two or more of the above systems.

[0088] RAN node 110, sometimes also referred to as access network equipment, network equipment, RAN entity, or access node, constitutes part of a communication system and facilitates wireless access for terminals. Multiple RAN nodes 110 in a communication system can be of the same type or different types. In some scenarios, the roles of RAN node 110 and terminal 120 are relative. For example, network element 120i in Figure 1 can be a helicopter or drone, which can be configured as a mobile base station. For terminal 120j accessing RAN 100 via network element 120i, network element 120i is a base station; however, for base station 110a, network element 120i is a terminal. RAN node 110 and terminal 120 are sometimes referred to as communication devices. For example, network elements 110a and 110b in Figure 1 can be understood as communication devices with base station functionality, and network elements 120a-120j can be understood as communication devices with terminal functionality.

[0089] In one possible scenario, a RAN node may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next generation NodeB (gNB), a next generation base station in a sixth generation (6G) mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system. A RAN node may be a macro base station (such as 110a in FIG1 ), a micro base station or an indoor station (such as 110b in FIG1 ), a relay node or a donor node, or a wireless controller in a CRAN scenario. Optionally, a RAN node may also be a server, a wearable device, a vehicle or an onboard device. For example, an access network device in vehicle to everything (V2X) technology may be a road side unit (RSU). All or part of the functions of the RAN node in this application may also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform (such as a cloud platform). The RAN node in this application may also be a logical node, a logical module or software that can implement all or part of the RAN node functions.

[0090] In another possible scenario, multiple RAN nodes collaborate to assist the terminal in achieving wireless access, and different RAN nodes respectively implement part of the functions of the base station. For example, the RAN node can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or they can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0091] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0092] The RAN node can also be expressed in different ways. Unless otherwise specified in this application, the network device is used to express it.

[0093] It should be understood that Figure 1 is merely a schematic diagram and may include other devices not shown. In addition, the embodiments of the present application do not limit the number of terminal devices and network devices included in the communication system.

[0094] In an embodiment of the present application, a terminal device or a network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software. In addition, the present application does not specifically limit the specific structure of the execution subject of the method provided by the present application. As long as it is possible to communicate according to the method provided by the embodiment of the present application by running a program that records the code of the method provided by the present application, for example, the execution subject of the method provided by the embodiment of the present application can be a terminal device or a network device, or a functional module in a terminal device or a network device that can call a program and execute the program.

[0095] In addition, various aspects or features of the present application can be implemented as methods, apparatuses, or articles of manufacture using standard programming and / or engineering techniques. The term "article of manufacture" as used in this application covers computer programs that can be accessed from any computer-readable device, carrier, or medium. For example, computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes, etc.), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks, or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0096] In this application, "sending information to...(terminal)" can be understood as the destination of the information being the terminal. This can include sending information to the terminal directly or indirectly. "Receiving information from...(terminal)" can be understood as the source of the information being the terminal, which can include receiving information from the terminal directly or indirectly. The information may undergo necessary processing between the source and destination of the information, such as format changes, but the destination can understand the valid information from the source. Similar expressions in this application can be understood similarly and will not be repeated here.

[0097] To facilitate understanding of the embodiments of the present application, first, a brief introduction to the concepts and technologies involved in the embodiments of the application is given.

[0098] It should be understood that the relevant terms and explanations in the following text are common to all embodiments throughout the text. Different embodiments can be used independently or in combination based on certain internal or external connections. Different implementation methods in the embodiments can be used independently or in combination.

[0099] 1. Reference signal (RS)

[0100] A reference signal, also known as a pilot signal, is a known signal provided by a transmitting device to a receiving device for channel estimation, channel measurement, channel sounding, or channel demodulation. In embodiments of the present application, the reference signal can be applied to the physical layer and does not carry data information from higher layers. Furthermore, the reference signal can include a downlink reference signal and an uplink reference signal.

[0101] Among them, the downlink reference signal includes the cell-specific reference signal (CRS) for downlink, the terminal equipment specific reference signal (UE-RS) for downlink, the channel state information reference signal (CSI-RS) for downlink channel measurement, the group-specific reference signal (GRS) for downlink, the positioning reference signal (PRS) for downlink, the beam reference signal (BRS) for downlink, the beam refinement reference signal (BRRS) for downlink, or the phase compensation reference signal (PCRS) for downlink, etc. Among them, the UE-RS for downlink is also called the demodulation reference signal (DMRS) for downlink. The uplink reference signal includes the demodulation reference signal DMRS for uplink demodulation, the sounding reference signal (SRS) for uplink channel measurement, or the PCRS for uplink, etc. The DMRS used for demodulation of the physical uplink control channel (PUCCH) is called the PUCCH DMRS, and the DMRS used for demodulation of the physical uplink shared channel (PUSCH) is called the PUSCH DMRS. It should be understood that the reference signals listed above are only examples and should not constitute any limitation on this application. This application does not exclude the possibility of defining other reference signals in future protocols to achieve the same or similar functions.

[0102] 2. Padding

[0103] When a terminal device has no data to send but receives an uplink authorization, the terminal device will send padding byte data to enable the network device to correctly identify the status of the terminal device.

[0104] The ratio of uplink and downlink padding bytes in NR field traffic scenarios is relatively high, a phenomenon common across different equipment vendors, with a significant increase in gaming and voice scenarios. In downlink scenarios, such as FTP and large file downloads, the corresponding padding ratio is relatively low. For video services, the corresponding padding ratio is around 10% to 30%. In gaming, voice, and live streaming scenarios, the downlink padding ratio exceeds 60%.

[0105] In uplink scenarios, such as file transfer protocol (FTP) upload scenarios, the corresponding padding ratio is relatively low. In other scenarios, the corresponding uplink padding ratio is relatively high, and there are differences between different network devices.

[0106] The main reasons for the high padding bytes are:

[0107] (1) In small packet transmission scenarios, such as gaming and voice, there is a lot of pre-scheduling. For example, in gaming scenarios, there is a situation where a lot of padding is sent but the BSR is 0.

[0108] (2) There is a service with actual demand in the middle of a buffer state report (BSR). After reporting the gear, the network device actually configures more resources than the demand. For example, the terminal device actually requires 1879 bytes, sends a BSR of 17, and for bytes <= 2014 bytes, the actual corresponding network device configuration is 2754 bytes.

[0109] (3) There is no obvious modulation and coding scheme (MCS) degradation in the uplink. Even if the resource block (RB) is scheduled small, the corresponding transfer block size (TBsize) is still relatively large, resulting in more padding bits.

[0110] 3. Cyclic redundancy check (CRC)

[0111] After the network device receives the data sent by the terminal device, it needs to equalize and decode the data to restore the bit-level information. The network device uses cyclic redundancy check to determine whether the corresponding data is received correctly. If it is received correctly, the corresponding cyclic redundancy check bit is equal to 0 (ie, CRC = 0). If it is not received correctly, the corresponding cyclic redundancy check bit is equal to 1 (ie, CRC = 1).

[0112] Figure 2 is a schematic diagram of possible data transmission. As shown in Figure 2, when a terminal device sends data, if the number of resources allocated by the network device is greater than the actual amount of data to be transmitted, the terminal device can send PUSCH using the number of resources corresponding to the actual amount of data, which can achieve some energy saving effects.

[0113] It should be understood that in the above transmission scheme, when the terminal device has no data to send, if no data is sent, the network device side will think that the terminal device has not correctly detected the uplink authorization UL-Grant, thereby causing the network device to adjust the PDCCH aggregation level and reduce the downlink spectrum resource utilization.

[0114] As shown in Figure 3, the terminal device has no data to send, but the network device will still send a UL-Grant to the terminal in order to minimize the uplink scheduling delay.

[0115] Based on the above scenario, the present application provides a data transmission method, in which the terminal device saves energy by choosing not to send data but to send pilot symbols. The network device can correctly identify that the terminal device has no data to send rather than that it has not correctly received the UL-Grant.

[0116] It is understood that the schematic diagrams of the methods in this application use network devices and terminal devices as examples of the execution entities of the interactive diagrams to illustrate the methods, but this application does not limit the execution entities of the interactive diagrams. For example, the network device in the figure can also be a module applied to the network device (such as a chip, a chip system, or a processor), or a logical node, a logical module, or software that can implement all or part of the functions of the network device; the terminal device in the figure can also be a module applied to the terminal device (such as a chip, a chip system, or a processor), or a logical node, a logical module, or software that can implement all or part of the functions of the terminal device.

[0117] FIG4 is a schematic diagram of a data transmission method 200 provided in an embodiment of the present application. As shown in FIG4 , the method 200 includes at least the following steps:

[0118] S210, the terminal device sends a first buffer status report BSR to the network device; correspondingly, the network device receives the first BSR.

[0119] The BSR is used to report the amount of data to be transmitted in the uplink buffer of the terminal device to the network device.

[0120] The first BSR indicates that the amount of data to be transmitted of the terminal device is 0, that is, the terminal device has no data to be transmitted.

[0121] S220, the network device sends an uplink grant UL Grant to the terminal device according to the first BSR; correspondingly, the terminal device receives the uplink grant.

[0122] It should be understood that in order to minimize the uplink scheduling delay, the network device will still send an uplink grant to the terminal.

[0123] The network device determines whether the terminal device has uplink data to transmit based on the BSR sent by the terminal device. The uplink grant is used to indicate the uplink transmission resources that the terminal device can use.

[0124] The uplink grant may indicate a first resource and a second resource.

[0125] The first resource is a resource that the terminal device can use for uplink transmission of data or padding data, and the second resource is a resource that the terminal device uses for uplink transmission of a pilot signal.

[0126] It should be understood that the resources in this application may refer to time domain resources, frequency domain resources, or time-frequency resources. Among them, time domain resources include symbols, slots, mini-slots, partial slots, sub-frames, radio frames, sensing slots, etc. Frequency domain resources include resource elements (REs), resource blocks (RBs), RB sets, subchannels, bandwidth parts (BWPs), carriers, channels, interlaces, etc.

[0127] S230: The terminal device turns off the symbol or reduces the power in the first resource.

[0128] In other words, the terminal device does not send data on the first resource that originally sends padding data, but turns off symbols or reduces power, thereby effectively reducing the power consumption of the terminal device and achieving energy saving.

[0129] S240, the terminal device sends a demodulation reference signal DMRS on the second resource.

[0130] When the first BSR indicates that the number of pending transmissions of the terminal device is 0, the terminal device sends a DMRS on the second resource instead of sending data.

[0131] After receiving the uplink grant from the network device, if the terminal device has no service data to send, it sends one or more pilot resource elements. The pilot resource element includes one or more pilot OFDM symbols, or the pilot resource element includes one or more pilot frequency domain subcarriers on one or more OFDM symbols.

[0132] Optionally, the method 200 may further include 221, where the network device sends first configuration information, and correspondingly, the terminal device receives the first configuration information.

[0133] The first configuration information indicates a time domain and / or frequency domain position of the DMRS in the second resource.

[0134] The network device may configure the position in the time domain and / or frequency domain at which the terminal device sends the DMRS, or the network device and the terminal device may also specify the position at which the DMRS is sent through a protocol.

[0135] In a possible implementation, the terminal device sends a pilot symbol in the allocated frequency domain bandwidth.

[0136] In one possible implementation, the second resource includes multiple frequency domain resources, and the terminal device sends the pilot signal on some of the frequency domain resources. Exemplarily, the terminal device sends the pilot resource element on some resource blocks or subcarriers of the allocated frequency domain bandwidth.

[0137] In a possible implementation, when the number of received uplink grants corresponding to the first BSR indicating that the amount of data to be transmitted is 0 is greater than a second threshold, a DMRS is sent to the network device on the second resource.

[0138] When the terminal device receives an uplink authorization sent by the network device, it counts the number of times it receives an uplink authorization corresponding to the first BSR indicating that the amount of data to be transmitted is 0, that is, the terminal device has no data to send and has received the uplink authorization sent by the network device. Only when the number is greater than or equal to the second threshold, does it send DMRS.

[0139] In the above implementation, the terminal device may further receive second configuration information sent by the network device, where the second configuration information is used to indicate a second threshold.

[0140] The second threshold value may be configured for the terminal device through the network device, or may be specified through a protocol.

[0141] S250: The network device detects the first power and the second power.

[0142] The first resource corresponds to a first power, the second resource corresponds to a second power, and a DMRS is detected on the second resource.

[0143] When the DMRS is detected on the second resource, it can be determined that the terminal device has sent the DMRS.

[0144] The network device can determine that the terminal device has received the uplink authorization based on the first power and the second power.

[0145] Exemplarily, when the first power is less than a threshold value and the second power is greater than a threshold value, it can be determined that the terminal device has received an uplink authorization.

[0146] As another example, when the ratio of the second power to the first power is greater than a threshold value, it can be determined that the terminal device has received an uplink authorization.

[0147] In a possible implementation, the network device determines a power difference based on the first power and the second power; and determines that the terminal device receives an uplink authorization based on the power difference.

[0148] When the power difference is greater than the first threshold, it is determined that the terminal device receives the uplink authorization.

[0149] The first threshold may be (pre-)configured or specified by a protocol.

[0150] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0151] It should be understood that the network device cannot know in advance whether the terminal device has data to transmit during detection. In order to correctly identify whether the terminal device has data to send or whether it has correctly received the uplink authorization, the network device can detect the data and pilot signals according to the following methods.

[0152] Method 1

[0153] As shown in Figure 5, after the network device sends an uplink authorization to the corresponding terminal device, if the BSR feedback sent by the terminal device most recently does not contain data to be transmitted, then when the network device receives the data time slot sent by the terminal device, it first detects whether the terminal device has sent DMRS. If the terminal device has not sent DMRS, it can be determined that the terminal device has not detected the uplink authorization, that is, the terminal device is in a discrete transmission DTX state.

[0154] When it is determined based on the signal to interference plus noise ratio SINR that the terminal device has sent a DMRS, a first power for transmitting data and a second power for transmitting the DMRS are determined; and a power difference is determined based on the first power and the second power.

[0155] When the difference between the average power of the first resource and the average power of the second resource is greater than (or equal to) the first threshold, it is determined that the terminal device has no data to send and the terminal device has received an uplink authorization, that is, the terminal device is in an energy-saving state, so data balancing and decoding are not required.

[0156] When the difference between the average power of the first resource and the average power of the second resource is less than (or equal to) a first threshold, the data is equalized and decoded; and whether the data is correctly received is determined according to a cyclic redundancy check code CRC.

[0157] When the check bit is detected to be correct (ie, CRC=0), it is determined that the data is received correctly, and the corresponding data and results are reported to the data link layer L2.

[0158] When a check bit error is detected (ie, CRC=1), it is determined that the network device detects data error, and triggers the terminal device to retransmit.

[0159] According to the above method, the power difference between the pilot and data domains can be used to determine whether the terminal device has sent data, which can reduce the complexity of network equipment detecting data and further determine whether the terminal device is in an energy-saving state.

[0160] Method 2

[0161] As shown in FIG6 , after the network device sends an uplink authorization to the corresponding terminal device, it balances and decodes the data in the first resource and determines whether the data is received correctly based on the cyclic redundancy check code CRC.

[0162] When the check bit is detected to be correct (ie, CRC=0), it is determined that the data is received correctly, and the corresponding data and results are reported to the data link layer L2.

[0163] When a check bit error is detected (i.e., CRC=1), the network device further detects whether the terminal device has sent DMRS based on SINR (including PostSINR / PreSINR). When it is determined that the terminal device has not sent DMRS, it is determined that the terminal device has not detected the uplink authorization, that is, the terminal device is in a discrete transmission DTX state.

[0164] When it is determined that the terminal device has sent a DMRS, a first power corresponding to the first resource and a second power corresponding to the second resource are determined; and a power difference is determined according to the first power and the second power.

[0165] When the difference between the average power of DMRS and the average power of data resources is greater than (or equal to) the first threshold, it is determined that the terminal device has no data to send and the terminal device has received an uplink authorization, that is, the terminal device is in an energy-saving state, and thus data retransmission and PDCCH CCE adjustment are not required.

[0166] When the difference between the average power of the DMRS and the average power of the data resource is less than (or equal to) the first threshold, it is determined that the network device detects a data error, triggering the terminal device to retransmit.

[0167] Through the above method, the data detection results, pilot detection results and the power difference between the pilot and data can be used to further determine the three states of network device detection data error, terminal device not receiving uplink authorization and terminal device energy saving.

[0168] Method 3

[0169] As shown in FIG7 , after the network device sends an uplink authorization to the corresponding terminal device, it balances and decodes the data in the first resource and determines whether the data is received correctly based on the cyclic redundancy check code CRC.

[0170] When the check bit is detected to be correct (ie, CRC=0), it is determined that the data is received correctly, and the corresponding data and results are reported to the data link layer L2.

[0171] When a check bit error is detected (i.e., CRC=1), the network device further detects whether the terminal device has sent DMRS based on SINR (including PostSINR / PreSINR). When it is determined that the terminal device has not sent DMRS, it is determined that the terminal device has not detected the uplink authorization, that is, the terminal device is in a discrete transmission DTX state.

[0172] When it is determined that the terminal device has sent a DMRS, a first power corresponding to the first resource and a second power corresponding to the second resource are determined; and a power difference is determined according to the first power and the second power.

[0173] When the difference between the average power of DMRS and the average power of data resources is greater than (or equal to) the first threshold and the BSR sent by the terminal device most recently indicates that the data to be transmitted by the terminal device is 0, it is determined that the terminal device has no data to send and the terminal device has received an uplink authorization, that is, the terminal device is in an energy-saving state, and there is no need for data retransmission and PDCCH CCE adjustment.

[0174] When the difference between the average power of DMRS and the average power of data resources is less than (or equal to) the first threshold or the BSR sent by the terminal device most recently indicates that the data to be transmitted by the terminal device is 0, it is determined that the network device detects a data error and triggers the terminal device to retransmit.

[0175] Through the above method, using the data detection results, pilot detection results, and the power difference between the pilot and data, and further combining whether the BSR is 0, it is possible to determine the three states of network device detection data error, terminal device failure to receive uplink authorization, and terminal device energy saving, thereby reducing the probability of misjudgment.

[0176] Through the solution of this application, the minimum delay scheduling of terminal devices can be supported, and when the terminal device has no business transmission, the power consumption of the terminal device is guaranteed to be reduced, and energy consumption can be saved by up to 93%.

[0177] FIG8 is a flow chart of a data transmission method 300 provided in an embodiment of the present application.

[0178] As shown in FIG8 , the method includes at least the following steps:

[0179] S310, the terminal device sends a second buffer status report BSR to the network device; correspondingly, the network device receives the second BSR.

[0180] The second BSR indicates that the amount of data to be transmitted by the terminal device is 0.

[0181] S320, the network device sends scheduling information to the terminal device according to the BSR; correspondingly, the terminal device receives the scheduling information.

[0182] The scheduling information may be an uplink grant UL Grant or a downlink resource scheduling DL Grant.

[0183] The scheduling information includes indication information, which indicates that the sounding reference signal SRS is sent on the third resource, that is, the scheduling information includes indication information for triggering the terminal device to send the SRS, and the SRS is sent on the third resource.

[0184] S330, the terminal device sends an SRS according to the scheduling information.

[0185] S340: The network device detects the SRS on the third resource and determines whether the scheduling information is received.

[0186] The network device detects an SRS on the third resource, and when the SRS is detected on the third resource, determines that the scheduling information is received; when the SRS is not detected on the third resource, determines that the scheduling information is not received.

[0187] Generally speaking, UL Grant and DL Grant are usually sent on the same or adjacent time resources, so the channel quality of the two is the same or similar. Therefore, the indication information can be carried in the UL Grant or in the DL Grant. For example, when the indication information is carried in the DL Grant, the terminal device receives the DL Grant and sends the SRS according to the indication information therein. When the network device detects the SRS, it can be determined that the terminal device has received the DL Grant, and it can also be considered that the terminal device has also received the UL Grant.

[0188] It should be understood that in the various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0189] It should be understood that the network device cannot know in advance whether the terminal device has data to transmit during detection. In order to correctly identify whether the terminal device has data to send or whether the UL Grant has been correctly received, the network device can detect the data and pilot signals according to the following method.

[0190] Method 4

[0191] As shown in Figure 9, the network device includes indication information in the scheduling information sent to the terminal device. This indication information triggers the terminal device to send an aperiodic SRS. The network device detects the data sent by the terminal device on the first resource and performs channel estimation, equalization, and decoding. The cyclic redundancy check code (CRC) is used to determine whether the data is received correctly.

[0192] When the check bit is detected to be correct (ie, CRC=0), it is determined that the data is received correctly, and the corresponding data and results are reported to the data link layer L2.

[0193] When a check bit error is detected (i.e., CRC=1), the network device needs to further detect whether the terminal device has sent DMRS based on SINR (including PostSINR / PreSINR). When it is determined that the terminal device has sent data and DMRS, the network device determines that the terminal device data has not been demodulated correctly and triggers the terminal device to retransmit.

[0194] When it is determined that the terminal device has not sent data and DMRS, the network device further detects whether the terminal device has sent a non-periodic SRS pilot. If it is detected that the terminal device has sent a non-periodic SRS pilot, it is determined that the terminal device has no data to send and the terminal device has received scheduling information including uplink authorization, and there is no need for data retransmission and PDCCH CCE adjustment.

[0195] If it is detected that the terminal device does not send the non-periodic SRS pilot, it is determined that the terminal device does not detect the scheduling information including the uplink authorization, that is, the terminal device is in the discrete transmission DTX state.

[0196] According to the above method, by triggering SRS signaling and detecting SRS signals, it is possible to determine three states: network device detection data error, terminal device failure to receive uplink authorization, and terminal energy saving.

[0197] According to the aforementioned method, FIG10 is a schematic diagram of a wireless communication apparatus 400 provided in an embodiment of the present application.

[0198] As shown in FIG. 10 , the communication device 400 may include an interface unit 410 and a processing unit 420 .

[0199] In one possible design, the communication device 400 may correspond to the network device in the above method embodiment.

[0200] Exemplarily, the communication device 400 may correspond to the network device (or base station or gNB) in the method 200 according to an embodiment of the present application, and the interface unit 410 in the communication device 400 is configured to receive a first buffer status report BSR from a terminal device, where the first BSR indicates that the amount of data to be transmitted of the terminal device is 0; and send an uplink grant according to the first BSR, where the uplink grant indicates a first resource and a second resource;

[0201] The processing unit 420 in the communication device 400 is used to detect a first power corresponding to a first resource; detect a second power corresponding to a second resource, and detect a demodulation reference signal DMRS on the second resource; and determine whether the terminal device has received an uplink authorization based on the first power and the second power.

[0202] In a possible implementation, the processing unit 420 is specifically configured to: determine a power difference according to the first power and the second power; and determine, according to the power difference, that the terminal device has received an uplink authorization.

[0203] In a possible implementation, the processing unit 420 is specifically configured to: when the power difference is greater than a first threshold, determine that the terminal device has received an uplink authorization.

[0204] In a possible implementation, the interface unit 410 is further configured to: send first configuration information to the terminal device, where the first configuration information indicates a time domain and / or frequency domain position of the DMRS in the second resource.

[0205] The interface unit 410 in the communication device 400 performs the receiving and sending operations performed by the network device in the above-mentioned method embodiments, and the processing unit 420 performs operations other than the receiving and sending operations.

[0206] Exemplarily, the communication device 400 may correspond to the network device in the method 300 according to an embodiment of the present application, and the interface unit 410 in the communication device 400 is configured to receive a second buffer status report BSR from a terminal device, where the second BSR indicates that the amount of data to be transmitted of the terminal device is 0; and send scheduling information according to the second BSR, where the scheduling information includes indication information, where the indication information indicates that a sounding reference signal SRS is sent on a third resource;

[0207] The processing unit 420 in the communication device 400 is configured to detect the SRS on the third resource and determine whether the scheduling information is received.

[0208] In a possible implementation, the processing unit 420 is specifically configured to: determine that the scheduling information is received when an SRS is detected on the third resource; and determine that the scheduling information is not received when no SRS is detected on the third resource.

[0209] The interface unit 410 in the communication device 400 performs the receiving and sending operations performed by the network device (or base station or gNB) in the above-mentioned method embodiments, and the processing unit 420 performs operations other than the receiving and sending operations.

[0210] In another possible design, the communication device 400 may also correspond to the terminal device in the above method embodiment.

[0211] Exemplarily, the communication device 400 may correspond to the terminal device in the method 200 according to an embodiment of the present application, and the interface unit in the communication device 400 may include a sending unit, and the interface unit 410 in the communication device 400 is used to send a first buffer status report BSR to the network device, and the first BSR indicates that the amount of data to be transmitted of the terminal device is 0; receive an uplink authorization from the network device, and the uplink authorization indicates a first resource and a second resource; send a demodulation reference signal DMRS to the network device on the second resource; a processing unit is used to turn off symbols or reduce power on the first resource.

[0212] In a possible implementation, the interface unit 410 is further configured to: receive first configuration information from the network device, where the first configuration information indicates a time domain and / or frequency domain position of the DMRS in the second resource.

[0213] In a possible implementation, the interface unit 410 is specifically configured to: when the number of received uplink grants corresponding to the first BSR indicating that the amount of data to be transmitted is 0 is greater than a second threshold, send a DMRS to the network device on the second resource.

[0214] In a possible implementation, the interface unit 410 is further configured to: receive second configuration information from the network device, where the second configuration information indicates a second threshold.

[0215] The interface unit 410 in the communication device 400 performs the receiving and sending operations performed by the terminal device in the above-mentioned method embodiments, and the processing unit 420 performs operations other than the receiving and sending operations.

[0216] According to the aforementioned method, Figure 11 is a schematic diagram of a communication device 500 provided in an embodiment of the present application. As shown in Figure 11, the device 500 can be a terminal device or a network device.

[0217] The apparatus 500 may include a processor 510 (i.e., an example of a processing unit) and a memory 520. The memory 520 is used to store instructions, and the processor 510 is used to execute the instructions stored in the memory 520, so that the apparatus 500 implements the steps performed by the terminal device or network device in method 200 or method 300.

[0218] Furthermore, the apparatus 500 may also include an interface 530 (i.e., an example of a receiving unit module). Furthermore, the processor 510, memory 520, and interface 530 may communicate with each other through an internal connection path to transmit control and / or data signals. The memory 520 is used to store a computer program, and the processor 510 may be used to call and execute the computer program from the memory 520 to control the interface 530 to receive or send signals, thereby completing the steps of the terminal device or network device in the above method. The memory 520 may be integrated into the processor 510 or may be provided separately from the processor 510.

[0219] In one possible implementation, if the communication apparatus 500 is a communication device, the interface 530 is a receiver or a transmitter. The receiver and the transmitter may be the same or different physical entities. When they are the same physical entity, they may be collectively referred to as a transceiver.

[0220] In a possible implementation, if the communication device 500 is a chip or a circuit, the interface 530 is an input interface or the interface 530 is an output interface.

[0221] As an implementation method, the function of the interface 530 may be implemented by a transceiver circuit or a dedicated transceiver chip. The processor 510 may be implemented by a dedicated processing chip, a processing circuit, a processor, or a general-purpose chip.

[0222] As another implementation, it is possible to use a general-purpose computer to implement the communication device provided in the embodiments of the present application. That is, the program code that implements the functions of the processor 510 and the interface 530 is stored in the memory 520, and the general-purpose processor implements the functions of the processor 510 and the interface 530 by executing the code in the memory 520.

[0223] For the concepts, explanations, detailed descriptions and other steps involved in the device 500 and related to the technical solutions provided in the embodiments of the present application, please refer to the descriptions of these contents in the aforementioned methods or other embodiments, and will not be repeated here.

[0224] Figure 12 is a schematic diagram of the structure of a terminal device 60 provided by this application. For ease of illustration, Figure 12 only shows the main components of the communication device. As shown in Figure 12, the terminal device 60 includes a processor, memory, control circuit, antenna, and input and output devices.

[0225] The processor is primarily used to process communication protocols and communication data, control the entire terminal device, execute software programs, and process software program data, such as supporting the terminal device in executing the actions described in the embodiment of the method for indicating a transmission precoding matrix. The memory is primarily used to store software programs and data, such as the codebook described in the above embodiment. The control circuit is primarily used to convert baseband signals into radio frequency signals and process radio frequency signals. The control circuit and antenna together are also called a transceiver, which is primarily used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, displays, and keyboards, are primarily used to receive user input and output data to the user.

[0226] When the communication device is powered on, the processor reads the software program stored in the storage unit, interprets and executes the software program's instructions, and processes the software program's data. When data needs to be sent wirelessly, the processor performs baseband processing on the data to be transmitted and outputs the baseband signal to the RF circuit. The RF circuit then performs RF processing on the baseband signal and transmits it outward in the form of electromagnetic waves via the antenna. When data is sent to a terminal device, the RF circuit receives the RF signal via the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data.

[0227] Those skilled in the art will appreciate that, for ease of explanation, FIG12 shows only one memory and processor. In an actual terminal device, multiple processors and memories may exist. The memory may also be referred to as a storage medium or storage device, etc., which is not limited in the present embodiment.

[0228] As an optional implementation, the processor may include a baseband processor and a central processing unit (CPU). The baseband processor is primarily responsible for processing communication protocols and communication data, while the CPU is primarily responsible for controlling the entire terminal device, executing software programs, and processing data from these programs. The processor in Figure 12 integrates the functions of both the baseband processor and the CPU. Those skilled in the art will appreciate that the baseband processor and the CPU may also be independent processors interconnected via a bus or other technology. Those skilled in the art will appreciate that a terminal device may include multiple baseband processors to accommodate different network standards, multiple CPUs to enhance its processing capabilities, and that the various components of the terminal device may be connected via various buses. The baseband processor may also be referred to as a baseband processing circuit or a baseband processing chip. The CPU may also be referred to as a central processing circuit or a central processing chip. The functionality for processing communication protocols and communication data may be built into the processor or stored as a software program in a storage unit, with the processor executing the software program to implement the baseband processing functionality.

[0229] As shown in Figure 12, terminal device 60 includes an interface unit 61 and a processing unit 62. The interface unit may also be referred to as a transceiver, transceiver, or transceiver device. Alternatively, the device in interface unit 61 that implements the receiving function may be considered a receiving unit, and the device in interface unit 61 that implements the transmitting function may be considered a transmitting unit. That is, interface unit 61 includes a receiving unit and a transmitting unit. For example, the receiving unit may also be referred to as a receiver, a receiver, or a receiving circuit, and the transmitting unit may be referred to as a transmitter, a transmitter, or a transmitting circuit.

[0230] The terminal device shown in FIG12 can execute each action executed by the terminal device in method 200 or method 300. Here, in order to avoid redundancy, a detailed description thereof is omitted.

[0231] An embodiment of the present application also provides a computer-readable storage medium on which computer instructions for implementing the method executed by the network device or terminal device in the above method embodiment are stored.

[0232] For example, when the computer program is executed by a computer, the computer can implement the method performed by the network device or the terminal device in the above method embodiment.

[0233] An embodiment of the present application also provides a computer program product comprising instructions, which, when executed by a computer, enables the computer to implement the method executed by the terminal device in the above method embodiment, or the method executed by the network device or the terminal device.

[0234] An embodiment of the present application further provides a communication system, which includes the network device and terminal device in the above embodiment.

[0235] The explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can be referred to the corresponding method embodiments provided above, which will not be repeated here.

[0236] It should be understood that in the embodiments of the present application, the processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0237] It should also be understood that the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memories. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of random access memory (RAM) are available, such as static RAM (SRAM), dynamic random access memory (DRAM), synchronous DRAM (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0238] The above embodiments can be implemented in whole or in part by software, hardware, firmware or any other combination. When implemented using software, the above embodiments 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 or computer programs. When the computer instructions or computer program are loaded or executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can 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 can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that contains one or more available media sets. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium. The semiconductor medium can be a solid-state drive.

[0239] It should be understood that the term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0240] Those skilled 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. Those skilled in the art will clearly understand that for the convenience and simplicity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here. In the several embodiments provided in this 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 the units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. On the other hand, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, which may be electrical, mechanical or other forms.

[0241] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment. In addition, the functional units in the various embodiments of the present application may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. If the functions are implemented in the form of software functional units and sold or used as independent products, they may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the portion that contributes to the prior art, or the portion of the technical solution, may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard drive, a read-only memory, a random access memory, a magnetic disk, or an optical disk.

[0242] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A data transmission method, characterized in that: include: Receiving a first buffer status report BSR from a terminal device, wherein the first BSR indicates that the amount of data to be transmitted of the terminal device is 0; Sending an uplink grant according to the first BSR, where the uplink grant indicates a first resource and a second resource; detecting a first power corresponding to the first resource; detecting a second power corresponding to the second resource, and detecting a demodulation reference signal DMRS on the second resource; It is determined that the terminal device has received the uplink authorization based on the first power and the second power.

2. The method according to claim 1, characterized in that Determining, according to the first power and the second power, that the terminal device receives the uplink authorization includes: determining a power difference according to the first power and the second power; It is determined based on the power difference that the terminal device has received the uplink authorization.

3. The method according to claim 2, characterized in that Determining, according to the power difference, that the terminal device receives the uplink authorization includes: When the power difference is greater than a first threshold, it is determined that the terminal device has received the uplink authorization.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: Send first configuration information to the terminal device, where the first configuration information indicates the time domain and / or frequency domain position of the DMRS in the second resource.

5. A data transmission method, the method being applied to a terminal device, characterized in that: include: Sending a first buffer status report BSR to the network device, where the first BSR indicates that the amount of data to be transmitted of the terminal device is 0; receiving an uplink grant from the network device, the uplink grant indicating a first resource and a second resource; Sending a demodulation reference signal DMRS to the network device on the second resource; Symbols are turned off or power is reduced on the first resource.

6. The method according to claim 5, characterized in that The method further comprises: First configuration information is received from the network device, where the first configuration information indicates a time domain and / or frequency domain position of the DMRS in the second resource.

7. The method according to claim 5 or 6, characterized in that: Sending a DMRS to the network device on the second resource includes: When the number of received uplink grants corresponding to the first BSR indicating that the amount of data to be transmitted is 0 is greater than a second threshold, a DMRS is sent to the network device on the second resource.

8. The method according to claim 7, characterized in that The method further includes receiving second configuration information from the network device, wherein the second configuration information indicates the second threshold.

9. A data transmission method, characterized in that: include: Receiving a second buffer status report BSR from a terminal device, where the second BSR indicates that the amount of data to be transmitted of the terminal device is 0; Send scheduling information according to the second BSR, where the scheduling information includes indication information, where the indication information indicates sending of a sounding reference signal SRS on a third resource; The SRS is detected on the third resource, and it is determined whether the scheduling information is received.

10. The method according to claim 9, characterized in that Detecting the SRS on the third resource and determining whether the scheduling information is received includes: When the SRS is detected on the third resource, determining that the scheduling information is received; When the SRS is not detected on the third resource, it is determined that the scheduling information is not received.

11. A data transmission device, characterized in that: include: An interface unit, configured to receive a first buffer status report BSR from a terminal device, wherein the first BSR indicates that the amount of data to be transmitted of the terminal device is 0; Sending an uplink grant according to the first BSR, where the uplink grant indicates a first resource and a second resource; a processing unit, configured to detect a first power corresponding to the first resource; A second power corresponding to the second resource is detected, and a demodulation reference signal DMRS is detected on the second resource; and it is determined that the terminal device has received the uplink authorization based on the first power and the second power.

12. The device according to claim 11, characterized in that The processing unit is specifically used for: determining a power difference according to the first power and the second power; It is determined based on the power difference that the terminal device has received the uplink authorization.

13. The device according to claim 12, characterized in that The processing unit is specifically used for: When the power difference is greater than a first threshold, it is determined that the terminal device has received the uplink authorization.

14. The device according to any one of claims 11 to 13, characterized in that The interface unit is also used for: Send first configuration information to the terminal device, where the first configuration information indicates the time domain and / or frequency domain position of the DMRS in the second resource.

15. A data transmission device, characterized in that: include: An interface unit, configured to send a first buffer status report BSR to a network device, wherein the first BSR indicates that the amount of data to be transmitted of the terminal device is 0; receiving an uplink grant from the network device, the uplink grant indicating a first resource and a second resource; sending a demodulation reference signal DMRS to the network device on the second resource; A processing unit is configured to turn off symbols or reduce power on the first resource.

16. The device according to claim 15, characterized in that The interface unit is also used for: First configuration information is received from the network device, where the first configuration information indicates a time domain and / or frequency domain position of the DMRS in the second resource.

17. The device according to claim 15 or 16, characterized in that The interface unit is specifically used for: When the number of received uplink grants corresponding to the first BSR indicating that the amount of data to be transmitted is 0 is greater than a second threshold, a DMRS is sent to the network device on the second resource.

18. The device according to claim 17, characterized in that The interface unit is also used for: Second configuration information is received from the network device, where the second configuration information indicates the second threshold.

19. A data transmission device, characterized in that: include: An interface unit, configured to receive a second buffer status report BSR from a terminal device, wherein the second BSR indicates that the amount of data to be transmitted of the terminal device is 0; Send scheduling information according to the second BSR, where the scheduling information includes indication information, where the indication information indicates sending of a sounding reference signal SRS on a third resource; A processing unit is used to detect the SRS on the third resource and determine whether the scheduling information is received.

20. The device according to claim 19, characterized in that The processing unit is specifically used for: When the SRS is detected on the third resource, determining that the scheduling information is received; When the SRS is not detected on the third resource, it is determined that the scheduling information is not received.

21. A communication device, characterized in that: include: A processor, wherein the processor is configured to execute a program or an instruction so that the apparatus executes the method according to any one of claims 1 to 4, or the apparatus executes the method according to claim 9 or 10.

22. A communication device, characterized in that: include: A processor, wherein the processor is configured to execute a program or an instruction so that the apparatus executes the method according to any one of claims 5 to 8.

23. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 4, or the method according to any one of claims 5 to 8, or the method according to claim 9 or 10.

24. A computer program product, characterized in that The method comprises a computer program code, and when the computer program code is executed, the method according to any one of claims 1 to 4, or the method according to any one of claims 5 to 8, or the method according to claim 9 or 10 is implemented.

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