A communication method, a communication device, and a chip system

Abstract

The application provides a communication method, a communication device and a chip system, relates to the technical field of communication, and the method can be applied to a scene of sending an early sounding reference signal (early SRS) for example. In the method, after a terminal device sends Msg3 to a network device, the network device estimates a first path loss based on the Msg3, and the network device sends Msg4 to the terminal device. The Msg4 carries first information used for determining a target transmission power, and the target transmission power is obtained by adjusting an initial transmission power of the early SRS based on the first path loss. After the terminal device receives the Msg4, determines the target transmission power based on the first information, and sends the early SRS to the network device by using the target transmission power. Therefore, under the premise that there is a lack of configuration before a radio resource control (RRC) connection is successfully established, the purpose of more accurately determining the transmission power of the early SRS is beneficial to improving the accuracy of channel estimation and the reliability of uplink data transmission.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a communication method, communication device, and chip system. Background Technology

[0002] In New Radio (NR) systems, an Early Sounding Reference Signal (Early SRS) mechanism is introduced. Before a Radio Resource Control (RRC) connection is successfully established between the terminal device and the network device, such as during the transition from an RRC idle state or an inactive RRC state to an connected RRC state, the terminal device sends an Early SRS to the network device. This allows the network device to obtain the uplink CSI in advance based on the received Early SRS before the terminal device completes the regular Channel State Information (CSI) configuration. This enables beam management, uplink scheduling, and accurate precoding of the first downlink transmission, thereby improving uplink transmission performance.

[0003] In order for network devices to receive early SRS sent by terminal devices, the terminal devices need to send early SRS with appropriate transmit power so that network devices can receive early SRS and perform relevant configurations based on the received early SRS to improve uplink transmission performance. Summary of the Invention

[0004] This application provides a communication method, communication device, and chip system that can more accurately determine the transmit power of early SRS in the absence of configuration before the successful establishment of an RRC connection, thereby improving the reliability of uplink data transmission.

[0005] Firstly, a communication method is provided. This method can be executed by a terminal device, or by a component (such as a circuit, chip, or chip system) configured in the terminal device, or by a logic module or software capable of implementing all or part of the functions of the terminal device. This application does not limit this approach. The following description uses a terminal device as an example.

[0006] The method includes: after a terminal device sends Msg3 to a network device, it receives Msg4 carrying first information from the network device; based on the first information, the terminal device sends an early detection reference signal to the network device using a target transmit power. The first information is used to determine the target transmit power, which is obtained by adjusting the initial transmit power of the early detection reference signal based on a first path loss. The first path loss is the path loss estimated based on Msg3.

[0007] Therefore, the path loss (or simply path loss) between network devices and terminal devices can be estimated based on the real-time transmission of Msg3. Since the time difference between Msg3 transmission and early SRS transmission is short, the channel characteristics corresponding to Msg3 transmission and early SRS transmission are similar or even the same within a short period of time. Thus, the path loss estimated based on Msg3 transmission is more suitable for the path loss during early SRS transmission, providing a power basis for determining the target transmit power of early SRS. In the absence of configuration before the successful establishment of RRC connection, more accurate determination of the transmit power of early SRS is beneficial to improving the accuracy of channel estimation and the reliability of uplink data transmission.

[0008] As one possible implementation, the first information is used to indicate the target's transmission power.

[0009] In this implementation, after receiving Msg4 from the network device, the terminal device can determine the target transmission power based on the first information carried by Msg4, without requiring the terminal device to perform any calculations, thus saving the terminal device's computing resources and power consumption.

[0010] As another possible implementation, the first information is used to indicate the adjustment step size. The target transmit power is obtained by adjusting the initial transmit power based on the adjustment step size. The initial transmit power can be calculated by the terminal device or the network device; there is no limitation on this.

[0011] In this implementation, after the terminal device receives Msg4 sent by the network device, it can determine the adjustment step size based on the first information carried by Msg4. Then, the terminal device adjusts the initial transmit power based on the adjustment step size to obtain the target transmit power, which achieves the purpose of more accurately determining the transmit power of early SRS, which is conducive to improving the accuracy of initial channel estimation and the reliability of uplink data transmission.

[0012] As another possible implementation, the first information is used not only to indicate the adjustment step size, but also to indicate the initial transmit power.

[0013] In this implementation, after receiving the first information, the terminal device can obtain the adjustment step size and initial transmit power indicated by the first information, without needing the terminal device to calculate the initial transmit power itself, which helps save the terminal device's computing resources and power consumption. Furthermore, the terminal device adjusts the received initial transmit power based on the adjustment step size to obtain the target transmit power, achieving a more accurate determination of the transmit power of the early SRS.

[0014] As another possible implementation, before the terminal device receives Msg4 from the network device, the method further includes: the terminal device receiving a system message from the network device. The system message carries parameters related to the initial transmit power. The parameters related to the initial transmit power include at least one of the following: nominal reference power, bandwidth adjustment term, or first path loss fading coefficient.

[0015] In this implementation, the network device sends system messages via broadcast, so that all terminal devices within the signal coverage area of ​​the network device can receive parameters related to the initial transmit power, enabling the terminal devices to obtain the necessary parameter configuration when calculating the target transmit power.

[0016] As another possible implementation, the initial transmit power is determined by the terminal device based on the nominal reference power, bandwidth adjustment term, first path loss fading coefficient, and first path loss.

[0017] In this implementation, since the first path loss is estimated by the network device based on Msg3, the initial transmit power calculated by the terminal device is more accurate, which helps to improve the accuracy of subsequent determination of the target transmit power.

[0018] As another possible implementation, the first path loss fading coefficient is a path loss fading coefficient that satisfies a first condition. The first condition includes: the first transmit power obtained based on the first path loss fading coefficient and the first path loss is less than or equal to the difference between the maximum transmit power and the power margin.

[0019] In this implementation, a first path loss fading coefficient that satisfies the first condition is selected from multiple available path loss fading systems. The reasonable selection of the first path loss provides a feasible basis for the reasonable design of the target transmit power of the early SRS.

[0020] As another possible implementation, the adjustment step size corresponds to the first energy difference; wherein the first energy difference is the absolute value of the difference between the expected received energy and the predicted received energy; the predicted received energy is determined based on the nominal reference power, the bandwidth adjustment term, the first path loss fading coefficient, and the first path loss.

[0021] In this implementation, there is a correspondence between the first energy difference and the adjustment step size. After the network device determines the first energy difference, the corresponding adjustment step size can be determined. Thus, after adjusting the initial transmit power of earlySRS based on the adjustment step size, the received energy predicted by the network device is as close as possible to the expected received energy.

[0022] As another possible implementation, the predicted received energy is the difference between the first transmit power and the first path loss. Based on this implementation, a feasible solution is provided for determining the predicted received energy. Furthermore, since the channel characteristics corresponding to the transmission of Msg3 and the transmission of early SRS are quite similar, and the first path loss is based on the path loss between the network device and the terminal device estimated from Msg3, the predicted received energy obtained based on the first transmit power and the first path loss is more accurate.

[0023] As another possible implementation, the first path loss is the ratio of a first value to a second value; wherein the first value is the difference between the pre-configured power control parameters and the measured received power of Msg3; and the second value is the difference between 1 and the path loss fading coefficient of Msg3.

[0024] In this implementation, since the time difference between the transmission of Msg3 and the transmission of early SRS is short, the channel characteristics corresponding to the transmission of Msg3 and the transmission of early SRS are relatively close within a short period of time. Therefore, the first path loss between the network device and the terminal device can be estimated based on Msg3, which helps to improve the accuracy of determining the transmission power of early SRS.

[0025] As another possible implementation, when the terminal device is one of multiple terminal devices that meets the second condition, the terminal device receives Msg4 from the network device carrying first information; wherein, the second condition includes at least one of the following: the cyclic redundancy check of Msg3 sent by the terminal device passes; the payload integrity level of the terminal device is the highest among the multiple terminal devices; the payload integrity level is determined based on whether the Msg3 sent by the terminal device contains the terminal device's identification information, and / or whether the terminal device has the ability to send an early probe reference signal; the channel quality of the physical uplink shared channel (PUSCH) carrying Msg3 is the highest among the multiple terminal devices; the arrival time of Msg3 at the network device is the earliest; and the preset configuration value of the terminal device is the largest.

[0026] In this implementation, during the contention-based random access process, when multiple terminal devices send Msg3 to the network device, the network device determines one terminal device from among the multiple terminal devices that meets the second condition for subsequent early SRS transmission, in order to maintain the principle that only one terminal device wins the contention.

[0027] As another possible implementation, if the power after adjusting the initial transmit power is greater than the maximum transmit power, the target transmit power is the maximum transmit power; if the power after adjusting the initial transmit power is less than the maximum transmit power, the target transmit power is the adjusted power.

[0028] In this implementation, the terminal device limits the transmission power of early SRS by comparing the adjusted power with the maximum transmission power, thus preventing the terminal device from sending early SRS to the network device at a high transmission power, which would interfere with other users and affect the communication quality of the entire cell.

[0029] Secondly, a communication method is provided, which can be executed by a network device, or by a component (such as a circuit, chip, or chip system) configured in the network device, or by a logic module or software capable of implementing all or part of the functions of the network device. This application does not limit this. The following description uses a network device as an example.

[0030] The method includes: after receiving Msg3 from multiple terminal devices, a network device sends Msg4 carrying first information to a target terminal device among the multiple terminal devices. The first information is used to determine the target transmit power. The network device receives an early detection reference signal transmitted by the target terminal device using the target transmit power. The target transmit power is obtained by adjusting the initial transmit power of the early detection reference signal based on a first path loss, and the first path loss is the path loss estimated based on Msg3.

[0031] In this method, the network device estimates the path loss between the network device and the terminal device based on the real-time transmitted Msg3. Since the time difference between the transmission of Msg3 and the transmission of early SRS is short, the channel characteristics corresponding to the transmission of Msg3 and the transmission of early SRS are similar or even the same within a short period of time. Thus, the path loss estimated based on the transmission of Msg3 is more suitable for the path loss during the transmission of early SRS, providing a power basis for determining the target transmit power of early SRS. In the absence of configuration before the successful establishment of RRC connection, the transmit power of early SRS can be determined more accurately, which is beneficial to improving the accuracy of channel estimation and the performance of uplink data transmission.

[0032] As one possible implementation, the first information is used to indicate the target's transmission power.

[0033] In this implementation, the network device sends Msg4, carrying first information, to the terminal device. Upon receiving Msg4, the terminal device can determine the target transmission power based on the first information carried in Msg4, without requiring any calculations from the terminal device, thus saving computing resources and power consumption. Furthermore, the network device sends the first information indicating the target transmission power in Msg4 to the terminal device, achieving the purpose of indicating the target transmission power to the terminal device without additional instructions, thereby reducing signaling interaction between the network device and the terminal device.

[0034] As another possible implementation, the first information is used to indicate the adjustment step size. The target transmit power is obtained by adjusting the initial transmit power based on the adjustment step size. The initial transmit power can be calculated by the terminal device or the network device; there is no limitation on this.

[0035] In this implementation, the network device sends Msg4 carrying first information to the terminal device. After the terminal device receives Msg4 sent by the network device, it can determine the adjustment step size based on the first information carried by Msg4. Then, the terminal device adjusts the initial transmit power based on the adjustment step size to obtain the target transmit power. This achieves the purpose of more accurately determining the transmit power of earlySRS, which is beneficial to improving the accuracy of channel estimation and the performance of uplink data transmission.

[0036] As another possible implementation, the first information is used not only to indicate the adjustment step size, but also to indicate the initial transmit power.

[0037] In this implementation, after the network device determines the initial transmit power, it indicates the initial transmit power to the target terminal device through the first information. The terminal device does not need to calculate the initial transmit power itself, which helps to save the terminal device's computing resources and power consumption.

[0038] As another possible implementation, before the network device sends Msg4 to the target terminal device among multiple terminal devices, the method further includes: the network device sending a system message to the multiple terminal devices, the system message carrying parameters related to the initial transmit power; the parameters related to the initial transmit power include at least one of the following: nominal reference power, bandwidth adjustment term or first path loss fading coefficient.

[0039] In this implementation, the network device sends system messages via broadcast, so that all terminal devices within the signal coverage area of ​​the network device can receive parameters related to the initial transmit power, enabling the terminal devices to obtain the necessary parameter configuration when calculating the target transmit power.

[0040] As another possible implementation, the initial transmit power is determined by the terminal device based on the nominal reference power, bandwidth adjustment term, first path loss fading coefficient, and first path loss.

[0041] In this implementation, since the first path loss is estimated by the network device based on Msg3, the initial transmit power calculated by the terminal device is more accurate, which is beneficial to the accuracy of subsequent determination of the target transmit power.

[0042] As another possible implementation, the first path loss fading coefficient is a path loss fading coefficient that satisfies a first condition; wherein the first condition includes: the first transmit power obtained based on the first path loss fading coefficient and the first path loss is less than or equal to the difference between the maximum transmit power and the power margin.

[0043] In this implementation, a first path loss fading coefficient that satisfies the first condition is selected from multiple available path loss fading systems. The reasonable selection of the first path loss provides a feasible basis for the reasonable design of the target transmit power of the early SRS.

[0044] As another possible implementation, the adjustment step size corresponds to the first energy difference; wherein the first energy difference is the absolute value of the difference between the expected received energy and the predicted received energy; the predicted received energy is determined based on the nominal reference power, the bandwidth adjustment term, the first path loss fading coefficient, and the first path loss.

[0045] In this implementation, the network device determines the adjustment step size corresponding to the first energy difference based on the mapping relationship between the adjustment step size and the energy difference. This ensures that after adjusting the initial transmit power of the early SRS based on the adjustment step size, the received energy predicted by the network device is as close as possible to the expected received energy.

[0046] As another possible implementation, the predicted received energy is the difference between the first transmit power and the first path loss.

[0047] Based on this implementation method, a feasible solution is provided for how to determine the predicted received energy. In addition, since the channel characteristics corresponding to the transmission of Msg3 and the transmission of early SRS are relatively close, and the first path loss is based on the path loss between the network device and the terminal device estimated based on Msg3, the predicted received energy obtained based on the first transmit power and the first path loss is more accurate.

[0048] As another possible implementation, the first path loss is the ratio of a first value to a second value; wherein the first value is the difference between the pre-configured power control parameters and the measured received power of Msg3; and the second value is the difference between 1 and the path loss fading coefficient of Msg3.

[0049] In this implementation, since the time difference between the transmission of Msg3 and the transmission of early SRS is short, the channel characteristics corresponding to the transmission of Msg3 and the transmission of early SRS are relatively close within a short period of time. Therefore, the first path loss between the network device and the terminal device can be estimated based on Msg3, which helps to improve the accuracy of determining the transmission power of early SRS.

[0050] As another possible implementation, the target terminal device satisfies the second condition, which includes at least one of the following: the cyclic redundancy check of the Msg3 sent by the terminal device passes; the payload integrity level of the terminal device is the highest among multiple terminal devices; the payload integrity level is determined based on whether the Msg3 sent by the terminal device contains the terminal device's identification information, and / or whether the terminal device has the ability to send an early probe reference signal; the channel quality of the uplink shared channel PUSCH carrying the Msg3 is the highest among multiple terminal devices; the arrival time of the Msg3 at the network device is the earliest; and the preset configuration value of the terminal device is the largest.

[0051] In this implementation, during the contention-based random access process, when multiple terminal devices send Msg3 to the network device, the network device determines one terminal device from among the multiple terminal devices that meets the second condition for subsequent early SRS transmission, in order to maintain the principle that only one terminal device wins the contention.

[0052] As another possible implementation, if the power after adjusting the initial transmit power is greater than the maximum transmit power, the target transmit power is the maximum transmit power; if the power after adjusting the initial transmit power is greater than the maximum transmit power, the target transmit power is the adjusted power.

[0053] In this implementation, the terminal device limits the transmission power of early SRS by comparing the adjusted power with the maximum transmission power, thus preventing the terminal device from sending early SRS to the network device at a high transmission power, which would interfere with other users and affect the communication quality of the entire cell.

[0054] The second aspect is the implementation on the network device side, which corresponds to the first aspect. The explanations, supplements, and descriptions of the beneficial effects of the first aspect also apply to the second aspect, and will not be repeated here.

[0055] Thirdly, a communication device is provided, comprising a processing module and a transceiver module. The transceiver module is used to send Msg3 to a network device; receive Msg4 from the network device, Msg4 carrying first information for determining a target transmission power, the target transmission power being obtained by adjusting the initial transmission power of an early detection reference signal based on a first path loss, the first path loss being the path loss estimated based on Msg3; and, based on the first information, sending an early detection reference signal to the network device using the target transmission power.

[0056] Fourthly, a communication device is provided, comprising a transceiver module and a processing module. The transceiver module is used to receive Msg3 transmitted by multiple terminal devices; to transmit Msg4 to a target terminal device among the multiple terminal devices, Msg4 carrying first information used to determine a target transmission power, the target transmission power being obtained by adjusting the initial transmission power of the early detection reference signal based on a first path loss, the first path loss being the path loss estimated based on Msg3; and to receive an early detection reference signal transmitted by the target terminal device using the target transmission power.

[0057] The third and fourth aspects are the implementation on the device side, which correspond to the first and second aspects. The explanations, supplements, and descriptions of the beneficial effects of the first and second aspects also apply to the third and fourth aspects, and will not be repeated here.

[0058] Fifthly, a communication device is provided, including a processor. The processor is coupled to a memory and can be used to execute instructions or data in the memory to implement the method in any possible implementation of the first aspect described above. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

[0059] In one implementation, the communication interface can be a transceiver, or an input / output interface.

[0060] In another implementation, the communication device is a chip configured in a terminal device. When the communication device is a chip configured in a terminal device, the communication interface can be an input / output interface.

[0061] In a sixth aspect, a communication device is provided, including a processor. The processor is coupled to a memory and can be used to execute instructions or data in the memory to implement the method in any possible implementation of the second aspect described above. Optionally, the communication device further includes a memory. Optionally, the communication device further includes a communication interface, and the processor is coupled to the communication interface.

[0062] In one implementation, the communication interface can be a transceiver, or an input / output interface.

[0063] In another implementation, the communication device is a chip configured in a network device. When the communication device is a chip configured in a network device, the communication interface can be an input / output interface.

[0064] In a seventh aspect, a processor is provided, comprising: an input circuit, an output circuit, and a processing circuit. The processing circuit is used to receive signals through the input circuit and transmit signals through the output circuit, causing the processor to execute a method in any possible implementation of any aspect.

[0065] In specific implementation, the processor can be one or more chips, the input circuit can be input pins, the output circuit can be output pins, and the processing circuit can be transistors, gate circuits, flip-flops, and various logic circuits. The input signal received by the input circuit can be received and input by, for example, but not limited to, a receiver, and the signal output by the output circuit can be, for example, but not limited to, output to and transmitted by a transmitter. Furthermore, the input circuit and the output circuit can be the same circuit, which is used as both the input circuit and the output circuit at different times. This application does not limit the specific implementation of the processor and various circuits.

[0066] Eighthly, a communication device is provided, including a processor and a memory. The processor is used to read instructions stored in the memory, receive signals via a receiver, and transmit signals via a transmitter to execute the method in any possible implementation of any of the preceding aspects.

[0067] Optionally, there may be one or more processors and one or more memories.

[0068] Ninthly, a computer program product is provided, comprising: a computer program (also referred to as code or instructions) that, when executed, causes a computer to perform a method in any possible implementation of any of the above aspects.

[0069] In a tenth aspect, a computer-readable storage medium is provided that stores a computer program (also referred to as code or instructions) that, when run on a computer, causes the computer to perform the methods in any possible implementation of any of the above aspects.

[0070] Eleventhly, embodiments of this application provide a chip system including one or more processors for calling and executing instructions stored in memory, causing the methods in any of the above aspects or possible implementations to be executed. The chip system may be composed of chips or may include chips and other discrete devices.

[0071] The chip system may include input circuits or interfaces for transmitting information or data, and output circuits or interfaces for receiving information or data.

[0072] In a twelfth aspect, a communication system is provided, including the aforementioned terminal device and network device. Optionally, the communication system may further include other devices that communicate with the terminal device and / or network device. Attached Figure Description

[0073] Figure 1 A schematic diagram of a communication system provided in an embodiment of this application;

[0074] Figure 2 A flowchart illustrating a communication method provided in an embodiment of this application;

[0075] Figure 3 A flowchart illustrating another communication method provided in an embodiment of this application;

[0076] Figure 4 A flowchart illustrating yet another communication method provided in an embodiment of this application;

[0077] Figure 5 A flowchart illustrating another communication method provided in an embodiment of this application;

[0078] Figure 6 A schematic block diagram of a communication device provided in an embodiment of this application;

[0079] Figure 7 A schematic block diagram of another communication device provided in an embodiment of this application. Detailed Implementation

[0080] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0081] The technical solutions provided in this application can be applied to various communication systems, such as: Global System for Mobile Communications (GSM) systems, General Packet Radio Service (GPRS), Wireless Local Area Network (WLAN), Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, sidelink communication systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, non-terrestrial network (NTN) communication systems, 5th generation (5G) mobile communication systems, or new radio access technology (NR). Among these, 5G mobile communication systems can include non-standalone (NSA) and / or standalone (SA) networking. The technical solutions provided in this application can also be applied to future communication systems. This application does not limit the scope of these applications.

[0082] Figure 1 This is a schematic diagram of a communication system provided in an embodiment of this application. The communication system 100 may include a network device 110 and a terminal device 120. The network device 110 and the terminal device 120 can communicate via a wireless link, for example, through the communication method provided in this application.

[0083] It should be understood that Figure 1 An exemplary network device 110 and a terminal device 120 are shown. Optionally, the communication system 100 may also include multiple network devices and / or multiple terminal devices.

[0084] The network equipment in this application can be network-side equipment such as access network equipment and core network equipment. Access network equipment is sometimes also called access node. Access network equipment has wireless transceiver capabilities and is used to communicate with terminals. Access network equipment includes, but is not limited to, base stations, evolved NodeBs (eNodeBs), transmission reception points (TRPs) in the above-mentioned communication systems, next-generation NodeBs (gNBs) in 5G mobile communication systems, access network equipment or modules of access network equipment in open RAN (ORAN) systems, satellites in NTN communication systems, base stations in future mobile communication systems, or access nodes in WiFi systems. Access network equipment can also be modules or units that can implement some of the functions of a base station. Access network equipment can be macro base stations, micro base stations or indoor stations, relay nodes or donor nodes, or wireless controllers in cloud radioaccess network (CRAN) scenarios. Optionally, access network equipment can also be servers, wearable devices, or vehicle-mounted equipment, etc. For example, the access network equipment in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). Multiple access network devices in a communication system can be base stations of the same type or different types. Base stations can communicate with terminals directly or via relay stations. Terminals can communicate with multiple base stations using different access technologies. The embodiments of this application do not limit the specific technology or device form used in the access network equipment. In this application, the access network equipment is referred to as a network device.

[0085] In this application, the means for implementing the functions of a network device can be a network device itself, or a means capable of supporting the network device in implementing those functions, such as a processor, circuit, chip, or chip system. This means can be installed in or connected to the network device. In the technical solutions provided in this application, the example of a network device being used to implement the functions of a network device is used to describe the technical solutions provided in this application.

[0086] The terminal device in this application can be a wireless terminal device capable of receiving network device scheduling and instruction information. The wireless terminal device can be a device providing voice and / or data connectivity to a user, a handheld device with wireless connectivity, or other processing devices connected to a wireless modem. For example, the terminal device can communicate with one or more core networks or the Internet via a radio access network (RAN). The terminal device can also be referred to as a terminal, user equipment (UE), mobile station, mobile terminal, etc. Terminal devices can be widely used in various scenarios, such as device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IoT), ultra-reliable low-latency communication (URLLC), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grids, smart furniture, smart offices, smart wearables, smart transportation, smart cities, or satellite communication, etc. The terminal can be a mobile phone, tablet computer, computer with wireless transceiver capabilities, wearable device, vehicle, aircraft (such as drone, helicopter, airplane), hot air balloon, ship, robot, robotic arm, or smart home device, etc. The embodiments of this application do not limit the form of the terminal device.

[0087] In this application, the apparatus for implementing the functions of a terminal device can be the terminal device itself, or any apparatus capable of supporting the terminal device in implementing those functions, such as a processor, circuit, chip, or chip system. This apparatus can be installed in or connected to the terminal device. In the technical solutions provided in this application, the example of a terminal device being used to implement the functions of a terminal device is used to describe the technical solutions provided in this application.

[0088] Taking network devices as access network devices and terminal devices as terminals as an example, access network devices and / or terminals can be fixed or mobile. Access network devices and / or terminals can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can be deployed in the air on airplanes, balloons, and artificial satellites. This application does not limit the application scenarios of access network devices and terminals. Access network devices and terminal devices can be deployed in the same or different scenarios. For example, access network devices and terminal devices can be deployed simultaneously on land; or, access network devices can be deployed on land and terminal devices can be deployed on water, etc., and so on.

[0089] In practical applications, multiple network devices can collaborate to assist terminals in achieving wireless access, with different network devices each implementing a portion of the base station's functions. For example, network devices can be central units (CUs), distributed units (DUs), CUs (control planes, CPs), CUs (user planes, UPs), or radio units (RUs), etc. CUs and DUs can be set up separately or included in the same network element, such as a baseband unit (BBU). RUs can be included in radio frequency equipment or radio frequency units, such as remote radio units (RRUs), active antenna units (AAUs), or remote radio heads (RRHs).

[0090] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (Open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software and hardware modules. CU (or CU-CP and CU-UP), DU, and RU can implement different protocol layer functions.

[0091] To facilitate understanding of the embodiments of this application, the terminology used in this application will be briefly explained first. Optionally, the explanation of some terms may also refer to the explanations in the 3rd Generation Partnership Project (3GPP) standard protocol.

[0092] 1. The random access procedure is an essential process for establishing a wireless link between a terminal device and a network device. Only after random access is completed can data transmission occur normally between the terminal device and the network device. Existing random access procedures include contention-free random access procedures and contention-based random access procedures.

[0093] The non-contention-based random access process is as follows: The terminal device receives the indication information from the network device and initiates random access using the random access preamble indicated by the indication information on the physical random access channel (PRACH) channel resources indicated by the indication information.

[0094] The contention-based random access process is as follows: (1) The terminal device can select a preamble to send a random access request message to the network device, also known as the first message (message 1, Msg1) or message 1. (2) After receiving Msg1 from the terminal device, the network device sends a random access response (RAR) message to the terminal device, also known as the second message (message 2, Msg2) or message 2. Msg2 includes uplink grant information and temporary cell radio network temporary identifier (TC-RNTI) and other information. The uplink grant information is used to instruct the terminal device to send the time and frequency domain resources, power control parameters, etc. of the third message (message 3, Msg3). (3) After receiving Msg2 from the network device, the terminal device sends a radio resource control (RRC) connection establishment request message (RRCConnectionRequest message) to the network device according to the uplink grant configuration, also known as Msg3 or message 3. (4) When Msg3 carries a competition resolution identity (CRI), after receiving the Msg3 message, the network device sends an RRC connection establishment success message to the terminal device, also known as the fourth message (message 4, Msg4) or message 4. Msg4 carries the competition resolution identity of the terminal device that sent Msg3, allowing all terminal devices receiving Msg4 to compare the competition resolution identity carried in Msg4 with the competition resolution identity carried in their own Msg3. If the terminal device determines that the competition resolution identity carried in the received Msg4 is the same as the competition resolution identity carried in its own Msg3, then the competition for access is resolved, and the random access procedure succeeds. Otherwise, the competition for access fails, and the terminal device needs to re-initiate the random access procedure.

[0095] If Msg3 does not carry a contention resolution identifier, the network device, upon receiving Msg3, determines the contention resolution identifier based on the terminal device's identity information carried in Msg3. This terminal device identity information includes at least one of the following: a 5G system temporary mobile subscriber identifier (5G-S-TMSI), a system architecture evolution (SAE) temporary mobile subscriber identifier (S-TMSI), or a random value. For example, the network device constructs a 48-bit contention resolution identifier based on the terminal device's 5G-S-TMSI.

[0096] For example, suppose the terminal device has a timer set (e.g., timer T300). In response to sending Msg3 to the network device, the terminal device starts timer T300. If the terminal device does not receive Msg4 before timer T300 times out, the terminal device determines that the current random access procedure has failed, releases the TC-RNTI, and may initiate a new random access procedure. If the terminal device receives an RRCSetup message or an RRCReject message before timer T300 times out, the terminal device stops running timer T300.

[0097] After the terminal device successfully accesses the network, the network device sends an RRCReconfiguration message (used to dynamically modify, enhance, or reconfigure RRC connection parameters) to the terminal device. Upon receiving the RRCReconfiguration message, the terminal device parses it and applies all configurations. The terminal device then sends an RRCReconfigurationComplete message to the network device on the uplink common control channel (UL-CCCH) to confirm configuration completion. At this point, the RRC connection between the terminal device and the network device is complete.

[0098] 2. Sounding Reference Signal (SRS): In wireless communication, a sounding reference signal is configured to measure the uplink channel. The terminal device can send the SRS to the network device via its transmit antenna (or transmit antenna port). After receiving the SRS, the network device can measure and estimate the uplink channel between the network device and the terminal based on the SRS, thereby obtaining the uplink channel information.

[0099] Early sounding reference signal (Early SRS) refers to the SRS signal sent by the terminal device to the network device before the successful establishment of the RRC connection between the terminal device and the network device. It provides the network device with uplink channel state information, allowing the network device to prepare for scheduling and beam management in advance, thereby optimizing the initial transmission. For example, any SRS signal transmitted by the terminal device to the network device before sending the RRC Reconfiguration Complete message can be considered an early SRS.

[0100] 3. Path loss refers to the power attenuation caused by the propagation environment (such as distance, obstacles, etc.) when transmitting signals between terminal devices and network devices. In wireless communication, without considering other gains and losses, path loss is the difference between the transmitted power and the received power of the signal.

[0101] 4. Nominal reference power is a reference power value used in a wireless system for unified measurement, standardized calculation, and coordination of device behavior. In this application, nominal reference power refers to the reference power value of early SRS, which is a reference value used to calculate the transmit power of early SRS, and not the actual transmit power of early SRS. Optionally, network devices can carry the nominal reference power in system information blocks (SIBs) for broadcasting, so that terminal devices within the signal coverage area of ​​the network devices can receive the nominal reference power, achieving the purpose of configuring a unified nominal reference power for terminal devices.

[0102] It should be understood that the technical terms used in this application are for illustrative purposes only and not as limiting. For example, as technology evolves, technical terms may also change, and other technical terms that have the same technical meaning should also apply to this application.

[0103] During the random access phase, existing transmit power control mechanisms primarily target Msg1 and Msg3, and are not applicable to early SRS. The design goal for Msg1 transmit power is to ensure that network devices can detect the random access preamble sent by the terminal device. The Msg1 transmit power control mechanism may include: if the network device does not detect the random access preamble sent by the terminal device, or if the terminal device does not receive a random access response message after sending the random access preamble, then the terminal device will increase the Msg1 transmit power in steps until the terminal device successfully transmits Msg1 or reaches the maximum number of retransmissions. Therefore, the Msg1 transmit power control mechanism employs a low-to-high power ramp-up mechanism to adapt to different path loss and coverage scenarios.

[0104] The design goal of Msg3 transmit power is to enable network devices to correctly decode Msg3. Power control for Msg3 is more focused on block error rate and coverage scenarios than on channel estimation accuracy.

[0105] Unlike the transmit power of Msg1 and Msg3, the core purpose of the transmit power of early SRS is to achieve high-precision channel estimation that can be used for beamforming and precoding design. The transmit power of early SRS sent by terminal equipment to network equipment must be sufficiently high to ensure the measurement accuracy and stability of channel estimation, while avoiding excessive uplink intra-cell or inter-cell interference that could disrupt the uplink transmission performance of other terminal equipment. If the control mechanism for early SRS transmit power simply follows that of Msg1 or Msg3, problems may arise such as insufficient signal-to-noise ratio (SNR) and difficulty in supporting fine beam management, or excessively high transmit power leading to uncontrolled interference. Therefore, early SRS differs fundamentally from Msg1 or Msg3 in terms of transmission target, signal structure, and impact on system interference patterns and overall performance; the control mechanism for early SRS transmit power cannot simply reuse the control mechanisms of Msg1 or Msg3.

[0106] Currently, when a terminal device is in the RRC idle state or RRC inactive state and has not yet completed the RRC connection establishment, there is usually no path loss reference signal associated with the transmission configuration indicator (TCI) status, nor are parameters related to the early SRS transmit power (such as the nominal reference power corresponding to the early SRS, path loss fading coefficient, etc.). This results in the terminal device lacking a basis for power setting when transmitting early SRS. Therefore, determining the early SRS transmit power without the configuration of early SRS transmit power is a technical problem that urgently needs to be solved.

[0107] In view of this, this application provides a communication method in which a terminal device sends Msg3 to a network device, the network device estimates a first path loss based on Msg3, and then sends Msg4 to the terminal device. Msg4 carries first information for determining a target transmit power, which is obtained by adjusting the initial transmit power of the early SRS based on the first path loss. After receiving Msg4, the terminal device determines the target transmit power based on the first information and then sends the early SRS to the network device using the target transmit power. Therefore, the network device estimates the path loss between the network device and the terminal device based on the real-time transmission of Msg3. Since the time difference between the transmission of Msg3 and the transmission of early SRS is short, the channel characteristics corresponding to the transmission of Msg3 and the transmission of early SRS are similar or even the same within a short period of time. Thus, the path loss estimated based on the transmission of Msg3 is more suitable for the path loss during the transmission of early SRS. By sending the first information for determining the target transmit power to the terminal device in Msg4, the purpose of more accurately determining the transmit power of early SRS is achieved in the absence of configuration before the successful establishment of RRC connection. This is beneficial to improving the accuracy of initial channel estimation and the reliability of uplink data transmission.

[0108] The solution provided in this application will be described in detail below with reference to the corresponding flowcharts. It is understood that the illustrative flowcharts provided in this application primarily use different devices (e.g., terminal devices, network devices) as examples of the execution subjects of this interactive illustration to illustrate the method, but this application does not limit the execution subjects of the interactive illustrations. For example, the devices (e.g., terminal devices, network devices) in the illustrative flowcharts can also be chips, chip systems, or processors that support the implementation of this method on the device, or logic modules or software that can implement all or part of the functions of the device.

[0109] As a general statement, the message or signaling interactions involved in the interaction process of this application embodiment can be standard messages or signaling or newly introduced messages or signaling. This application embodiment does not make specific limitations on this.

[0110] Figure 2 This is a flowchart illustrating a communication method provided in an embodiment of this application. It can be understood that... Figure 2 The terminal device in the middle can be Figure 1 Any terminal device in the context of network equipment can refer to any component within that terminal device (such as a processor, chip, or chip system). Network equipment can be... Figure 1 Any access network device, or a component within an access network device (such as a processor, chip, or chip system). Figure 2As shown, the method includes the following steps S210 to S230.

[0111] S210, the terminal device sends Msg3 to the network device, and the corresponding network device receives Msg3.

[0112] In this embodiment of the application, during the contention-based random access process, after the network device receives and successfully decodes Msg3 sent by the terminal device, the network device estimates the first path loss based on Msg3.

[0113] Specifically, the methods by which network devices estimate the first path loss include, but are not limited to, the following two:

[0114] In the first method, the network device uses the ratio of the calculated first value to the second value as the first path loss.

[0115] The first value is the difference between the pre-configured power control parameters and the measured received power of Msg3. The second value is the difference between 1 and the path loss fading coefficient of Msg3.

[0116] The pre-configured power control parameters are determined based on the bandwidth adjustment term of Msg3 and the reference power of Msg3. For example, the pre-configured power control parameters are the sum of the bandwidth adjustment term of Msg3 and the reference power of Msg3. That is, the first value can be understood as the difference between the sum of the bandwidth adjustment term of Msg3 and the reference power of Msg3 and the received power of Msg3.

[0117] In this application, the bandwidth adjustment term of Msg3 is a conversion term configured by the network device for the terminal device to convert the power spectral density into the total transmit power, so that when the terminal device is allocated different numbers of resource blocks, the power spectral density of each resource block arriving at the network device is relatively stable.

[0118] In this application, the transmit power of Msg3 is related to the bandwidth adjustment term, the first path loss, and the reference power of Msg3 by the following formula (1):

[0119] (1);

[0120] in, Transmit the Msg3 power to the terminal device; For the pre-configured bandwidth adjustment items for Msg3, The number of resource blocks pre-configured for transmitting Msg3; This is the reference power for Msg3; Here is the path loss fading coefficient for Msg3. The value of is not equal to 1; This represents the first path loss. for and sum.

[0121] In this application, in wireless communication, without considering other gains and losses, the first path loss is the difference between the transmit power of Msg3 and the receive power of Msg3. That is... , The transmit power for Msg3 sent by the terminal device, PL is the first path loss. The received power of Msg3 measured by the network device.

[0122] (2);

[0123] The process by which the network device measures the received power of Msg3 is as follows: The network device determines the location of Msg3 based on the uplink grant sent to the terminal device via Msg2. The uplink grant includes the time-domain resources, frequency-domain resources, and demodulation reference signal (DMRS) configuration information (DMRS type, location, etc.) for Msg3 sent by the terminal device. Based on the DMRS configuration information, the network device performs energy estimation and channel estimation on the DMRS signal, and then calculates the received power of Msg3 based on the energy and channel estimates.

[0124] Both formulas (1) and (2) above are formulas for calculating the transmission power of the terminal device transmitting Msg3. Therefore, Thus, the first path loss can be derived. That is, the network device can calculate the first path loss using the following formula (3).

[0125] (3);

[0126] The second method involves the network device calculating the first path loss based on the estimated transmit power of Msg3 sent by the terminal device and the measured receive power of Msg3.

[0127] For example, first path loss - .in, To estimate the transmission power of Msg3, To measure the received power of Msg3.

[0128] Optionally, the network device estimates the transmit power of Msg3 based on the following formula (4).

[0129] (4);

[0130] in, Downlink path loss estimated for terminal devices; , as well as For a detailed explanation, please refer to the explanations in formulas (1) and (2) above. They will not be repeated here.

[0131] Furthermore, the network device uses the estimated transmit power of Msg3 from the terminal device, the measured receive power of Msg3, and the formula... - The first path loss is calculated.

[0132] It should be noted that before the terminal device sends Msg3 to the network device, it has already sent Msg1 carrying the random access preamble to the network device, and the terminal device has successfully received Msg2 carrying the random access response from the network device. For a detailed explanation of the implementation process, please refer to the technical terminology section above; it will not be repeated here.

[0133] Furthermore, after receiving Msg3, the network device needs to parse Msg3 and determine the contention resolution identifier based on the terminal device's identity information carried in Msg3. After determining that the terminal device has successfully acquired the contention, S220 is executed to send a random access success message or Msg4 to the terminal device. Specifically, this process can be referred to existing technology and will not be elaborated upon here.

[0134] S220, the network device sends Msg4 to the terminal device, and the terminal device receives the Msg4.

[0135] In this application, Msg4 can carry not only the contention resolution identifier of the terminal device that sent Msg3, allowing the receiving terminal device to compare the contention resolution identifier carried in Msg4 with the contention resolution identifier carried in its own Msg3, thus determining whether its random access has been successful. In this application, Msg4 can also carry first information. That is, in this application, Msg4 carries first information in addition to its existing functions. Optionally, if the network device determines that the terminal device meets the second condition, the network device sends Msg4 to the terminal device carrying the first information. The specific implementation of the network device's determination of whether the terminal device meets the second condition will be described in subsequent embodiments and will not be detailed here.

[0136] In this application, the first information is used to determine the target transmit power. Alternatively, it can be understood as the first information being used to instruct / command the terminal device to transmit early SRS at the target transmit power, or to instruct / command the terminal device to correct the transmit power of early SRS to the target transmit power, etc. The target transmit power is determined based on the first path loss determined in step S210. For example, the network device or terminal device determines an adjustment step size based on the first path loss, and then adjusts the initial transmit power of early SRS based on the adjustment step size to obtain the target transmit power.

[0137] In this application, the adjustment step size refers to the step size used to adjust the initial transmit power. For example, the adjustment step size may be 2 dB, -4 dB, etc. The specific determination process for the adjustment step size, the first path loss, and the initial transmit power is detailed in the following embodiments. Figure 3 The details of this will not be discussed here.

[0138] Alternatively, the design of the first information can include, but is not limited to, the following implementation methods:

[0139] In the first implementation, the first piece of information is used to indicate the adjustment step size.

[0140] For example, after determining the adjustment step size based on the first path loss, the network device sends the first information indicating the adjustment step size in Msg4 to the terminal device. Upon receiving Msg4, the terminal device can obtain the adjustment step size. After calculating the initial transmit power, the terminal device adjusts the initial transmit power according to the adjustment step size to obtain the target transmit power.

[0141] Specifically, the implementation process of this method is described below. Figure 3 The description of that will not be detailed here.

[0142] In the second implementation, the first information is used to indicate the adjustment step size and the initial transmission power.

[0143] For example, after determining the adjustment step size based on the first path loss and calculating the initial transmit power, the network device sends the first information indicating the adjustment step size and the initial transmit power in Msg4 to the terminal device. Upon receiving Msg4, the terminal device determines the adjustment step size and the initial transmit power, and then adjusts the initial transmit power according to the adjustment step size to obtain the target transmit power. Specifically, the implementation process of this method is described below. Figure 4 The description of that will not be detailed here.

[0144] In this implementation, the terminal device does not need to calculate the initial transmit power. After receiving the adjustment step size and initial transmit power sent by the network device, it can adjust the initial transmit power according to the adjustment step size to determine the target transmit power, thereby reducing the computing resources of the terminal device and helping to reduce device power consumption.

[0145] In the third implementation method, the first information is used to indicate the target's transmission power.

[0146] For example, after determining the adjustment step size for adjusting the transmit power of the terminal device sending early SRS based on the first path loss, and calculating the initial transmit power, the network device adjusts the initial transmit power according to the adjustment step size to obtain the target transmit power. After determining the target transmit power, the network device sends first information including the target transmit power in Msg4 to the terminal device. Upon receiving Msg4, the terminal device can obtain the target transmit power. The specific implementation process is described below. Figure 5 The description of that will not be detailed here.

[0147] In this implementation, the network device carries the first information indicating the target transmit power in Msg4 and sends it to the terminal device. This achieves the purpose of instructing the terminal device on the target transmit power without additional commands, thereby reducing signaling interaction between the network device and the terminal device. The terminal device obtains the target transmit power directly from the network device without any calculations, which helps reduce device power consumption and save computing resources.

[0148] In this application, the network device carries the first information used to determine the target transmit power in Msg4 and sends it to the terminal device. Only a very small increase in signaling overhead is required to adjust the transmit power of early SRS, which has the advantages of high compatibility and high feasibility.

[0149] S230, the terminal device sends an early SRS to the network device using the target transmit power based on the first information, and the network device receives the early SRS accordingly.

[0150] In this embodiment, after determining the target transmit power, the terminal device sends an Early SRS to the network device using the target transmit power. Upon receiving the Early SRS, the network device can obtain uplink channel state information in advance and prepare resources (e.g., beams) to improve uplink data transmission performance. The network device's advance knowledge of the terminal device's channel quality enables more accurate initial scheduling.

[0151] In summary, in this embodiment, the terminal device sends Msg3 to the network device. After estimating the first path loss based on Msg3, the network device sends Msg4 carrying first information to the terminal device. This first information is used to determine the target transmit power. The target transmit power is obtained by adjusting the initial transmit power of the early SRS based on the first path loss. After determining the target transmit power based on the first information, the terminal device sends the early SRS to the network device using the target transmit power. Therefore, after random access is completed and before the RRC connection is successfully established, the network device estimates the first path loss between the network device and the terminal device based on the real-time transmission Msg3. Since the time difference between the transmission of Msg3 and the transmission of early SRS is short, the channel characteristics corresponding to the transmission of Msg3 and the transmission of early SRS are similar or even the same within a short period of time. Thus, the path loss estimated based on the transmission of Msg3 is more suitable for the path loss during the transmission of early SRS. Therefore, by sending the first information for determining the target transmit power to the terminal device in Msg4, the transmit power of early SRS can be determined more accurately in the absence of configuration before the successful establishment of the RRC connection, which is beneficial to improving the accuracy of channel estimation and the reliability of uplink transmission.

[0152] The following is in conjunction with the appendix Figure 3 - Appendix Figure 5 The following is a detailed introduction to several implementation methods for determining the target transmission power of the terminal device based on the specific content carried by the first information in S220 above.

[0153] Please see Figure 3 . Figure 3 This is a flowchart illustrating another communication method provided in an embodiment of this application. In this method, the first information is used to indicate the adjustment step size, such as... Figure 3 As shown, the process includes S310 to S370.

[0154] S310: The network device sends a system message to the terminal device, and the corresponding terminal device receives the system message.

[0155] The system message carries parameters related to the initial transmit power. These parameters include at least one of the following: nominal reference power and bandwidth adjustment item. The nominal reference power is the reference power value configured by the network device for the terminal device to transmit early SRS. The bandwidth adjustment item is a bandwidth-related power control item configured by the network device for the terminal device.

[0156] Optionally, the network device carries the nominal reference power in SIB1 and broadcasts SIB1 to terminal devices within its signal coverage area, enabling these devices to obtain the nominal reference power before initiating random access. Similarly, the network device carries the bandwidth adjustment term in SIBx and broadcasts SIB1 to terminal devices within its signal coverage area, allowing them to obtain the bandwidth adjustment term before initiating random access. Thus, terminal devices can obtain the necessary parameters for calculating the initial transmit power before successful random access, without needing to decode additional information.

[0157] It should be noted that the network device carries parameters related to the initial transmit power in the system message and broadcasts the system message. This allows terminal devices within the network device's signal coverage area to quickly obtain the parameters related to the initial transmit power based on the system message. This is just one example; the network device can also carry parameters related to the initial transmit power in other types of messages, without limitation. For example, the network device can carry parameters related to the initial transmit power in Msg4 and send it to the terminal device.

[0158] Furthermore, the terminal device initiates random access based on the received system message, such as the terminal device sending Msg1 to the network device, the network device sending Msg2 to the terminal device, and executing S320 as described below. For specific implementation details, please refer to the technical terminology section; they will not be elaborated upon here.

[0159] S320: The terminal device sends Msg3 to the network device, and the network device receives the corresponding Msg3.

[0160] S330, the network device estimates the first path loss based on the received Msg3.

[0161] In the embodiments of this application, the specific implementation of S320 to S330 is described in detail in the above-described S210, and will not be repeated here.

[0162] S340, the network device determines the first path loss fading coefficient and adjustment step size based on the first path loss.

[0163] The first path loss fading factor refers to the magnitude of power attenuation during the propagation of early SRS sent from the terminal device to the network device.

[0164] Optionally, the first path loss fading coefficient is a path loss fading coefficient that satisfies a first condition. The first condition includes: a first transmit power obtained based on the first path loss fading coefficient and the first path loss is less than or equal to the difference between the maximum transmit power and the power margin. Specifically, the network device can determine the first path loss fading coefficient that satisfies the first condition from a pre-configured pool of available path loss fading coefficients based on the first path loss.

[0165] In this application, the first transmit power calculated based on the first path loss fading coefficient and the first path loss can be obtained by referring to the above formula (1). For example, the transmit power can be the sum of the nominal reference power (or simply reference power), the bandwidth adjustment term, and the path loss adjusted by the path loss fading coefficient. The path loss adjusted by the path loss fading coefficient is the product of the first path loss and the first path loss fading coefficient. Similar to formula (1), the first transmit power can be calculated based on the following formula (5).

[0166] For example, the network device pre-configures a set of path loss fading coefficients, which includes all available path loss fading coefficients. This set can be {0, 0.6, 0.8, 1}. The network device selects a first path loss fading coefficient from the set of path loss fading coefficients that satisfies the following formulas (5) and (6).

[0167] (5);

[0168] (6);

[0169] in, The first transmission power, This represents the first path loss fading coefficient. The nominal reference power, The first path loss calculated in S330 above. For bandwidth adjustment items, these are known values ​​pre-configured for network devices. This refers to the maximum transmit power of the terminal device when sending early SRS to the network device. This is for power margin. and All of these are pre-configured on network devices.

[0170] In this embodiment, after determining the first path loss fading coefficient and the first path loss, the network device determines the predicted received energy based on the nominal reference power, bandwidth adjustment term, first path loss fading coefficient, and first path loss. Further, an adjustment step size is determined based on the predicted received energy and the expected received energy.

[0171] Optionally, the network device estimates the difference between the first transmit power and the first path loss based on the first path loss and the first path loss fading coefficient, i.e., the predicted receive energy. For example, the network device can calculate the predicted receive energy using the following formula (7).

[0172] (7);

[0173] in, To predict the received energy, , , as well as The description of is given in the above formula (5), and will not be repeated here.

[0174] Furthermore, the network device calculates the predicted received energy and the pre-configured expected received energy based on the above formula (7), and calculates the difference between the expected received energy and the predicted received energy, i.e. .in, The expected received energy refers to the energy that the network device expects to receive in the early SRS, which is pre-configured for the network device.

[0175] Then, after determining the absolute value of the difference between the expected received energy and the predicted received energy (i.e., the first energy difference), the network device determines the adjustment step size corresponding to the first energy difference based on the mapping relationship between the adjustment step size and the energy difference. Optionally, there is a direct proportional relationship between the adjustment step size and the energy difference. The larger the energy difference, the larger the adjustment step size; the smaller the energy difference, the smaller the adjustment step size. This can be understood as follows: when the received energy predicted by the network device does not reach the expected received energy, the network device can increase the adjustment step size to increase the transmit power of the early SRS, making the predicted received energy as close as possible to the expected received energy. When the received energy predicted by the network device exceeds the expected received energy, the network device can decrease the adjustment step size to reduce the transmit power of the early SRS. When the difference between the predicted received energy and the expected received energy is small, the network device can set the adjustment step size to 0, i.e., not adjust the transmit power of the early SRS.

[0176] For example, the mapping relationship between the adjustment step size and the energy difference is as follows:

[0177] ;

[0178] in, This is used to indicate the adjustment step size. For example, assuming the network device determines that the first energy difference is 2dB, the network device can determine the adjustment step size corresponding to the first energy difference based on the mapping relationship between the adjustment step size and the energy difference. It is 2dB or -2dB.

[0179] It should be noted that the above-mentioned mapping relationship between adjustment step size and energy difference is only a reference example, and is not limited in this embodiment.

[0180] S350: The network device sends Msg4 to the terminal device, and the terminal device receives the Msg4.

[0181] Msg4 carries first information and third information. The first information is used to indicate the adjustment step size. The third information includes the first path loss fading coefficient and the first path loss.

[0182] In this embodiment, the network device sends first information indicating the adjustment step size in Msg4 to the terminal device. After receiving Msg4, the terminal device determines the adjustment step size based on the content included in the first information. Optionally, the first information indicating the adjustment step size may include, but is not limited to, the following two methods.

[0183] Method 1: The first piece of information includes the specific value of the adjustment step size.

[0184] For example, assuming the adjustment step size is 2dB, after receiving Msg4, the terminal device determines the adjustment step size to be 2dB based on the content included in the first information.

[0185] Method 2: The first information is a bit in Msg4, and the value of this bit is mapped to the adjustment step size.

[0186] For example, a network device can assign a first bit value to the bit to indicate the adjustment step size corresponding to the first bit value.

[0187] Optionally, the network device pre-configures a mapping relationship between adjustment step size and bit values, and can broadcast this mapping relationship to the terminal device in a system message. Upon receiving Msg4, the terminal device can determine the adjustment step size indicated by the first information based on the bit values ​​in Msg4 and the mapping relationship between the adjustment step size and bit values. It should be understood that the mapping relationship between bit values ​​and step size can be predefined or configured, and there is no limitation on this.

[0188] For example, the first information consists of two bits in Msg4. When the value of these two bits is 00, the first information indicates an adjustment step size of 2dB; when the value of these two bits is 01, the first information indicates an adjustment step size of -2dB; when the value of these two bits is 10, the first information indicates an adjustment step size of 4dB; and when the value of these two bits is 11, the first information indicates an adjustment step size of -4dB.

[0189] Optionally, the first information carried in the Msg4 sent by the network device to the terminal device can be carried in the medium access control element (MAC CE) field, such as Early-SRS Control MAC CE; or it can be carried in DL-CCCH, without limitation. DL-CCCH is also used to send RRCSetup messages.

[0190] For example, the Early-SRS Control MAC CE carries an early SRS-trigger (occupying 1 bit), a first path loss fading coefficient (occupying 2 bits), an adjustment step size (occupying 2 bits), and a valid window (occupying 44 bits, in ms).

[0191] Optionally, when multiple terminal devices send a random access preamble and Msg3 to the network device, the Msg4 sent by the network device to the terminal device also carries a contention resolution identifier (e.g., UE Contention ResolutionIdentity MAC CE). This allows the terminal device to compare the contention resolution identifier carried in Msg4 with its own contention resolution identifier after receiving Msg4, in order to determine whether the random access initiated by the terminal device was successful.

[0192] It should be noted that this application does not limit the execution order of S350 and S360. For example, the network device may send the third information to the terminal device first, and then send Msg4 to the terminal device; or, the network device may send Msg4 to the terminal device first, and then send the third information to the terminal device; or, the network device may send the third information together with the first information in msg4 to the terminal device.

[0193] S360, the terminal device calculates the initial transmit power based on the parameters related to the initial transmit power carried in the system message in S310 and the first path loss fading coefficient and first path loss included in the third information in S350. Then, it adjusts the initial transmit power based on the adjustment step size to obtain the target transmit power.

[0194] Optionally, the terminal device calculates the initial transmit power based on the nominal reference power, the bandwidth adjustment term, the first path loss fading coefficient, and the first path loss. For example, the terminal device determines the initial transmit power by multiplying the first path loss fading coefficient and the first path loss, and then summing the product with the nominal reference power and the bandwidth adjustment term. For instance, the terminal device calculates the initial transmit power based on the following formula (8).

[0195] (8);

[0196] in, This is the initial transmit power. , , as well as The description of is given in the above formula (5), and will not be repeated here.

[0197] In one example, after calculating the initial transmit power, the terminal device can adjust the initial transmit power based on the received adjustment step size to obtain the target transmit power. For instance, suppose the terminal device calculates the initial transmit power and then determines the target transmit power by summing the initial transmit power with the adjustment step size.

[0198] Optionally, the network device pre-configures the maximum transmit power for early SRS transmission for the terminal device. If the power after adjusting the initial transmit power based on the adjustment step size is greater than the maximum transmit power, the terminal device determines the target transmit power as the maximum transmit power. If the power after adjusting the initial transmit power based on the adjustment step size is less than the maximum transmit power, the terminal device determines the target transmit power as the adjusted power. Thus, by comparing the adjusted power with the maximum transmit power, the terminal device limits the target transmit power for early SRS transmission, preventing the terminal device from using a high transmit power to send early SRS to the network device, interfering with other users, and affecting the overall communication quality of the cell.

[0199] For example, the terminal device can use the following formula (9) to determine the target transmit power.

[0200] Formula (9);

[0201] in, For the target transmission power, At maximum transmission power, To adjust the step size, , , as well as The description of is given in the introduction of formula (5), and will not be repeated here.

[0202] S370: The terminal device sends an early SRS to the network device using the target transmit power, and the network device receives the corresponding early SRS.

[0203] In the embodiments of this application, the specific implementation of S370 is described in detail in the above-described S230, and will not be repeated here.

[0204] In summary, in this embodiment, the terminal device sends Msg3 to the network device. The network device estimates the first path loss based on Msg3, determines an adjustment step size based on the first path loss, and then sends the adjustment step size to the terminal device. The terminal device calculates the initial transmit power, adjusts the initial transmit power based on the received adjustment step size to obtain the target transmit power, and then sends the early SRS to the network device using the target transmit power. Therefore, by estimating the first path loss based on Msg3 and determining the adjustment step size for the initial transmit power based on the first path loss, the network device achieves more precise control over the transmit power of the early SRS, thereby improving the accuracy of channel estimation and the performance of uplink data transmission.

[0205] Please see Figure 4 . Figure 4 This is a flowchart illustrating another communication method provided in an embodiment of this application. In this method, the first information is used to indicate the adjustment step size and the initial transmission power, such as... Figure 4 As shown, the process includes S410 to S470.

[0206] S410, the terminal device sends Msg3 to the network device, and the corresponding network device receives Msg3.

[0207] S420, the network device estimates the first path loss based on the received Msg3.

[0208] S430, the network device determines the first path loss fading coefficient and adjustment step size based on the first path loss.

[0209] In the embodiments of this application, the specific implementation of S410 to S430 is described in detail in the above-described S320 to S340, and will not be repeated here.

[0210] S440: The network device calculates the initial transmit power based on the nominal reference power, bandwidth adjustment term, first path loss fading coefficient, and first path loss.

[0211] In this embodiment, the specific implementation of the network device calculating the initial transmission power can be found in the specific implementation process of the terminal device calculating the initial transmission power in S370 above, and will not be repeated here.

[0212] S450: The network device sends Msg4 to the terminal device, and the terminal device receives the corresponding Msg4.

[0213] Msg4 carries first information, which is used to indicate the adjustment step size and the initial transmission power.

[0214] For example, the first information may directly include the value of the initial transmit power, or the first information may carry a second bit value, which has a mapping relationship with the initial transmit power. The method for indicating the initial transmit power in the first information is detailed in the specific implementation of indicating the adjustment step size in S350 above, and will not be repeated here.

[0215] For details on the specific implementation of the first information used to indicate the adjustment step size, please refer to the description in S350 above, which will not be repeated here.

[0216] In step S460, the terminal device adjusts the initial transmit power based on the adjustment step size received in step S450 above to obtain the target transmit power.

[0217] S470: The terminal device sends an early SRS to the network device using the target transmit power, and the network device receives the early SRS accordingly.

[0218] In the embodiments of this application, the specific implementation of S460 to S470 is described in detail in the above-described S360 to S370, and will not be repeated here.

[0219] In summary, in this embodiment, the terminal device sends Msg3 to the network device. After estimating the first path loss based on Msg3, the network device determines the adjustment step size and initial transmit power based on the first path loss, and then sends these to the terminal device. Upon receiving the adjustment step size and initial transmit power, the terminal device can adjust the initial transmit power based on the adjustment step size to determine the target transmit power. Then, the terminal device sends an early SRS to the network device using the target transmit power. It is evident that the terminal device does not need to calculate the initial transmit power, thereby reducing its computational resources and lowering power consumption. Therefore, by sending an early SRS to the network device with a more precise transmit power, the terminal device can better understand the channel quality of the terminal device in advance, enabling more accurate initial scheduling and resource preparation, which improves uplink data transmission performance.

[0220] Please see Figure 5 . Figure 5 This is a flowchart illustrating another communication method provided in an embodiment of this application. In this method, the first information is used to indicate the target transmission power, such as... Figure 5 As shown, the process includes S510 to S570.

[0221] S510: The terminal device sends Msg3 to the network device, and the network device receives the corresponding Msg3.

[0222] S520, the network device estimates the first path loss based on the received Msg3.

[0223] S530: The network device determines the first path loss fading coefficient and adjustment step size based on the first path loss.

[0224] S540: The network device calculates the initial transmit power based on the nominal reference power, bandwidth adjustment term, first path loss fading coefficient, and first path loss.

[0225] In the embodiments of this application, the specific implementation of S510 to S540 is described in detail in the above-described S410 to S440, and will not be repeated here.

[0226] In the S550 network device, the initial transmit power is adjusted based on the adjustment step size to obtain the target transmit power.

[0227] In this embodiment, the process by which the network device adjusts the initial transmit power based on the adjustment step size can be referred to the process by which the terminal device adjusts the initial transmit power based on the adjustment step size in S370 above, and will not be repeated here.

[0228] In S560, the network device sends Msg4 to the terminal device, and the terminal device receives the corresponding Msg4.

[0229] Msg4 carries first information, which is used to indicate the target's transmission power.

[0230] In this embodiment, the specific implementation of the first information indicating the target transmission power can be referred to the specific implementation of the first information indicating the initial transmission power in S450 above, which will not be repeated here.

[0231] As can be seen, the network device can send the first information indicating the target transmission power in Msg4 to the terminal device without sending additional instructions to the terminal device, thereby reducing the signaling interaction between the network device and the terminal device.

[0232] In step S570, the terminal device sends an early SRS to the network device using the target transmit power received in step S560 above, and the network device receives the early SRS accordingly.

[0233] In summary, in this embodiment, after the network device estimates the first path loss based on Msg3, it determines the adjustment step size and initial transmit power based on the first path loss, adjusts the initial transmit power using the adjustment step size, obtains the target transmit power, and then sends the target transmit power to the terminal device. This allows the terminal device to obtain the target transmit power for sending early SRS without performing additional calculations, which helps reduce device power consumption and save computing resources.

[0234] The following section will detail the specific implementation of how network devices determine whether a terminal device meets the second condition.

[0235] When multiple terminal devices send Msg3 to the network device (i.e., the network device receives Msg3 messages from multiple terminal devices), the network device does not estimate the path loss based on the received Msg3 messages. Instead, it selects one terminal device (hereinafter referred to as the target terminal device) that meets the second condition from among the multiple terminal devices and estimates the path loss based solely on the Msg3 message sent by the target terminal device. Further, the network device sends Msg4 to the target terminal device. After receiving Msg4, the target terminal device, based on the first information, sends an early SRS to the network device using the target transmit power.

[0236] The second condition includes at least one of the following: the cyclic redundancy check (CRC) of the Msg3 sent by the terminal device passes; the payload integrity level of the terminal device is the highest among multiple terminal devices; the channel quality of the physical uplink shared channel (PUSCH) carrying Msg3 is the highest among multiple terminal devices; the arrival time of Msg3 at the network device is the earliest; and the preset configuration value of the terminal device is the largest.

[0237] The payload integrity level is determined based on whether the Msg3 sent by the terminal device contains the terminal device's identification information, and / or whether the terminal device has the capability to send early SRS. For example, assume there are three payload integrity levels, ordered from highest to lowest: Level 1, Level 2, and Level 3. If the Msg3 sent by the terminal device includes the terminal device's identification information and the terminal device has the capability to send early SRS, the payload integrity level of the terminal device is Level 1. If the Msg3 sent by the terminal device does not include the terminal device's identification information or the terminal device does not have the capability to send early SRS, the payload integrity level of the terminal device is Level 2. If the Msg3 sent by the terminal device does not include the terminal device's identification information and the terminal device does not have the capability to send early SRS, the payload integrity level of the terminal device is Level 3.

[0238] The identification information of a terminal device refers to a unique identifier used to identify the terminal device. For example, the identification information of a terminal device can be a globally unique temporary identifier (GUTI), a subscription permanent identifier (SUPI), a permanent equipment identifier (PEI), etc. In this application embodiment, the identification information of the terminal device is not limited, and any identifier that can identify the terminal device is applicable to this application.

[0239] Whether a terminal device has the capability to send early SRS can be determined by its hardware, network configuration, or protocol specifications. For example, if the terminal device's hardware is insufficient to support early SRS transmission, then the terminal device does not have the capability to send early SRS. Alternatively, even if the terminal device's hardware is sufficient to support early SRS transmission by the network device, if the network device has not configured parameters for early SRS transmission for the terminal device, then the terminal device still does not have the capability to send early SRS.

[0240] The channel quality of PUSCH can be measured by metrics such as demodulated reference signal-to-noise ratio and block error rate.

[0241] The default configuration values ​​for terminal devices include the cell radio network temporary identifier (C-RNTI) or the DMRS scrambling ID. The C-RNTI is a temporary identifier assigned by the network device to uniquely identify the terminal device within the cell, typically any value between 1 and 65535. The DMRS scrambling ID is a numerical parameter used to generate the DMRS scrambling sequence; it is also a value configured by the network device and typically any value between 0 and 65535.

[0242] In this embodiment, the process by which the network device determines the target terminal device that meets the second condition from multiple terminal devices is as follows: After receiving and successfully decoding Msg3 sent by multiple terminal devices, the network device first performs a CRC check on Msg3. If the network device determines that there is no terminal device whose CRC check passes, the network device instructs the terminal device to follow a backoff retry rule, so that the terminal device waits for a period of time according to the backoff retry rule before initiating the random access procedure again. The backoff retry rule refers to the process by which the terminal device waits for a period of time according to a preset rule after a random access failure before re-initiating the random access procedure, thereby reducing the probability of consecutive conflicts by dispersing the retry opportunities.

[0243] If the network device determines that only one terminal device has passed the CRC check, then the network device determines that single terminal device as the target terminal device. If the network device determines that at least two terminal devices have passed the CRC check, then the network device sorts these two terminal devices in descending order of load integrity level. Then, the network device determines the target terminal device as the terminal device with the highest load integrity level. If the network device determines that at least two terminal devices have the highest load integrity level, then the network device sorts these two terminal devices in descending order of PUSCH channel quality, and determines the target terminal device as the terminal device with the highest PUSCH channel quality. If the network device determines that at least two terminal devices have the highest PUSCH channel quality, then the network device determines the terminal device that arrives at the network device earliest with Msg3 as the target terminal device. If the network device determines that at least two terminal devices arrive at the network device earliest with Msg3, then the network device determines the terminal device with the largest preset configuration value as the target terminal device.

[0244] Optionally, if the network device determines that the preset configuration value of the terminal device includes C-RNTI, the network device will determine the terminal device with the largest C-RNTI as the target device. If the network device determines that the preset configuration value of the terminal device includes the DMRS scrambling code identifier, the network device will determine the terminal device with the largest DMRS scrambling code identifier as the target device.

[0245] After the network device identifies the target terminal device from multiple terminal devices, if the Msg3 message received by the network device from the target terminal device carries a C-RNTI, the network device uses the C-RNTI as the contention resolution identifier for the target terminal device. If the Msg3 message received by the network device from the target terminal device does not carry a C-RNTI, the network device determines the contention resolution identifier based on the terminal device's identity information carried in the RRCConnectionRequest message. Subsequently, the network device sends the contention resolution identifier in Msg4 to the target terminal device, enabling the target terminal device to successfully initiate the random access procedure.

[0246] It should be noted that during random access, multiple terminal devices may use the same random access preamble and uplink resources, leading to resource conflicts during random access. To address this, the network device can include a contention resolution identifier in Msg4 and send it to the target terminal device. Upon receiving Msg4, the target terminal device compares the contention resolution identifier with its own C-RNTI or identity information to determine whether the random access initiated by the target terminal device was successful.

[0247] It should be understood that Figures 1 to 5 The flowcharts or scene diagrams shown are for illustrative purposes only and are not intended to limit the embodiments of this application to the examples illustrated. In fact, those skilled in the art can interpret the embodiments based on... Figures 1 to 5 The examples in the document can be transformed into equivalent ways to obtain more implementations.

[0248] The above text combined Figures 1 to 5 This document describes in detail the communication method provided in the embodiments of this application. The following will combine... Figures 6 to 7 The device embodiments of this application are described in detail below. It should be understood that the communication device of this application embodiment can execute the various communication methods of the foregoing embodiments of this application, that is, the specific working processes of the various products below can be referred to the corresponding processes in the foregoing method embodiments.

[0249] In the embodiments described above, the terminal device may execute some or all of the steps in each embodiment; the network device may execute some or all of the steps in each embodiment. These steps or operations are merely examples, and the embodiments of this application may also perform other operations or variations thereof. Furthermore, the steps may be executed in different orders as presented in the embodiments, and it is not necessary to execute all the operations in the embodiments of this application. Moreover, the sequence number of each step does not imply 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 this application.

[0250] Figure 6 This is a schematic block diagram of a communication device provided in an embodiment of this application. Figure 6 As shown, the communication device may include a communication module 620. The communication module 620 can implement corresponding communication functions, which can be internal communication functions of the communication device or communication functions between the communication device and other devices. Optionally, the communication module 620 may also be referred to as a communication interface or transceiver module. Optionally, the communication device further includes a processing module 610. The processing module 610 can implement corresponding processing functions.

[0251] Optionally, the communication device further includes a storage module, which can be used to store instructions and / or data; the processing module 610 can read the instructions and / or data in the storage module so that the communication device can implement the aforementioned method embodiments.

[0252] In one possible design, the communication device may correspond to the terminal device in the above method embodiments, or to a component (such as a circuit, chip, or chip system) configured in the terminal device. The communication device can be used to execute the steps or processes performed by the terminal device in any of the above method embodiments.

[0253] For example, the communication module 620 is used to send Msg3 to the network device.

[0254] The communication module 620 is used to receive Msg4 from the network device. Msg4 carries first information, which is used to determine the target transmission power. The target transmission power is obtained by adjusting the initial transmission power of the early detection reference signal based on the first path loss. The first path loss is the path loss estimated based on Msg3.

[0255] The communication module 620 is also used to send an early detection reference signal to the network device based on the first information and using the target transmit power.

[0256] The above are merely examples; for detailed steps or procedures, please refer to the descriptions in the foregoing embodiments.

[0257] In one possible design, the communication device may correspond to the network device in the above method embodiments, or to a component (such as a circuit, chip, or chip system) configured in the network device. The communication device can be used to perform the steps or processes executed by the network device in any of the above method embodiments.

[0258] For example, the communication module 620 is used to receive Msg3 sent by multiple terminal devices.

[0259] The communication module 620 is also used to send Msg4 to a target terminal device among multiple terminal devices. Msg4 carries first information, which is used to determine the target transmission power. The target transmission power is obtained by adjusting the initial transmission power of the early detection reference signal based on the first path loss. The first path loss is the path loss estimated based on Msg3.

[0260] The communication module 620 is also used to receive early detection reference signals transmitted by the target terminal equipment at the target transmit power.

[0261] The above are merely examples; for detailed steps or procedures, please refer to the descriptions in the foregoing embodiments.

[0262] Figure 7 This is a schematic block diagram of another communication device provided in an embodiment of this application. The communication device may be a chip, chip system, or processor, etc., in a terminal device or network device that implements the above-described method. This communication device can be used to implement the methods described in the above-described method embodiments; for details, please refer to the descriptions in the above-described method embodiments.

[0263] like Figure 7 As shown, the communication device may include one or more processors 710, which may also be referred to as processing units or processing modules, and can implement certain control functions. The processor 710 may be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, while the central processing unit can be used to control the communication device (e.g., base station, baseband chip, user, user chip), execute software programs, and process data from the software programs.

[0264] In an alternative design, the processor 710 may also store instructions and / or data, which can be executed by the processor 710 to cause the communication device to perform the methods described in the above method embodiments.

[0265] In another alternative design, the communication device may include a communication interface 720 for implementing receiving and transmitting functions. For example, the communication interface 720 may be a transceiver circuit, interface, interface circuit, or transceiver. The transceiver circuit, interface, interface circuit, or transceiver for implementing receiving and transmitting functions may be separate or integrated. The aforementioned transceiver circuit, interface, interface circuit, or transceiver may be used for reading and writing code / data, or it may be used for transmitting or relaying signals.

[0266] Optionally, the communication device may include one or more memories 730, which may store instructions that can be executed on the processor 710, causing the communication device to perform the methods described in the above method embodiments. Optionally, the memories 730 may also store data. Optionally, the processor 710 may also store instructions and / or data. The processor 710 and the memories 730 may be provided separately or integrated together.

[0267] It should be understood that, in one possible design, the steps in the method embodiments provided in this application can be implemented by integrated logic circuits in the processor's hardware or by instructions in software form. The steps of the methods disclosed in the embodiments of this application can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, detailed descriptions are not provided here.

[0268] In one implementation, the communication device may correspond to the terminal device in the above method embodiments and may be used to execute the various steps and / or processes executed by the terminal device in the above method embodiments. The processor 710 may be used to execute instructions stored in the memory 730, and when the processor 710 executes the instructions stored in the memory, the processor 710 is used to execute the various steps and / or processes of the above method embodiments corresponding to the terminal device.

[0269] In another implementation, the communication device may correspond to the network device in the above method embodiments and may be used to execute the various steps and / or processes executed by the network device in the above method embodiments. The processor 710 may be used to execute instructions stored in the memory 730, and when the processor 710 executes the instructions stored in the memory, the processor 710 is used to execute the various steps and / or processes of the above method embodiments corresponding to the network device.

[0270] It should be understood that the aforementioned processing device can be one or more chips. For example, the processing device can be a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system-on-chip (SoC), a central processor unit (CPU), a network processor (NP), a digital signal processor (DSP), a microcontroller unit (MCU), a programmable logic device (PLD), or other integrated chips.

[0271] It is understood that the memory in the embodiments of this application can be volatile memory or non-volatile memory, or may include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0272] According to the method provided in the embodiments of this application, this application also provides a chip system, which includes one or more processors for calling and executing instructions stored in memory, thereby causing the method described in the embodiments of this application to be executed. The chip system may be composed of chips or may include chips and other discrete devices.

[0273] The chip system may include input circuits or interfaces for transmitting information or data, and output circuits or interfaces for receiving information or data.

[0274] According to the method provided in the embodiments of this application, this application also provides a communication system, which includes the aforementioned network device and terminal device.

[0275] According to the method provided in the embodiments of this application, this application also provides a computer program product, which includes: computer program code, which, when run on a computer, causes the computer to execute the various steps or processes executed by the network device or terminal device in any of the foregoing method embodiments.

[0276] According to the method provided in the embodiments of this application, this application also provides a computer-readable storage medium storing program code, which, when run on a computer, causes the computer to execute the various steps or processes executed by the network device or terminal device in any of the foregoing method embodiments.

[0277] The computer-readable storage medium may be the aforementioned volatile memory or non-volatile memory, or it may include both volatile memory and non-volatile memory.

[0278] In the embodiments of this application, the terms and English abbreviations are exemplary examples given for ease of description and should not be construed as limiting the application in any way. This application does not preclude the possibility of defining other terms that can achieve the same or similar functions in existing or future agreements.

[0279] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as a computer program product. A computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated.

[0280] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0281] It should be understood that in the various embodiments of this application, the sequence number of each process does not imply 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 this application.

[0282] In summary, the above description is merely a preferred embodiment of the technical solution of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A communication method, characterized in that, Applied to a terminal device, the method includes: Send Msg3 to network devices; The network device receives Msg4, which carries first information for determining the target transmit power. The target transmit power is obtained by adjusting the initial transmit power of the early detection reference signal based on a first path loss. The first path loss is the path loss estimated based on Msg3. Based on the first information, the early detection reference signal is sent to the network device using the target transmission power.

2. The method according to claim 1, characterized in that, The first information is used to indicate the target's transmission power.

3. The method according to claim 1, characterized in that, The first information is used to indicate the adjustment step size; The target transmission power is obtained by adjusting the initial transmission power based on the adjustment step size.

4. The method according to claim 3, characterized in that, The first information is also used to indicate the initial transmit power.

5. The method according to claim 3, characterized in that, Before receiving Msg4 from the network device, the method further includes: Receive a system message from the network device, the system message carrying parameters related to the initial transmit power; the parameters related to the initial transmit power include at least one of the following: nominal reference power, bandwidth adjustment term, or first path loss fading coefficient.

6. The method according to claim 5, characterized in that, The initial transmit power is determined by the terminal device based on the nominal reference power, the bandwidth adjustment term, the first path loss fading coefficient, and the first path loss.

7. The method according to claim 6, characterized in that, The first path loss fading coefficient is the path loss fading coefficient that satisfies the first condition. The first condition includes: the first transmit power obtained based on the first path loss fading coefficient and the first path loss is less than or equal to the difference between the maximum transmit power and the power margin.

8. The method according to any one of claims 3-6, characterized in that, The adjustment step size corresponds to the first energy difference value; Wherein, the first energy difference is the absolute value of the difference between the expected received energy and the predicted received energy; The predicted received energy is determined based on the nominal reference power, bandwidth adjustment term, first path loss fading coefficient, and first path loss.

9. The method according to claim 8, characterized in that, The predicted received energy is the difference between the first transmit power and the first path loss, which is based on the first path loss fading coefficient and the first path loss.

10. The method according to any one of claims 1-7, characterized in that, The first path loss is the ratio of a first value to a second value; wherein the first value is the difference between the pre-configured power control parameters and the measured received power of Msg3; and the second value is the difference between 1 and the path loss fading coefficient of Msg3.

11. The method according to any one of claims 1-7, characterized in that, If the terminal device is one of a plurality of terminal devices that meets the second condition, the terminal device receives the first information carried in the Msg4 from the network device; The second condition includes at least one of the following: The cyclic redundancy check of Msg3 sent by the terminal device passed. The payload integrity level of the terminal device is the highest among the plurality of terminal devices; the payload integrity level is determined based on whether the Msg3 sent by the terminal device contains the identification information of the terminal device, and / or whether the terminal device has the ability to send an early detection reference signal; The uplink shared channel PUSCH carrying Msg3 has the highest channel quality among the multiple terminal devices; Msg3 arrives at the network device earliest; The preset configuration value of the terminal device is the maximum.

12. The method according to any one of claims 1-7, characterized in that, If the power after adjusting the initial transmission power is greater than the maximum transmission power, the target transmission power is the maximum transmission power; If the power after adjusting the initial transmit power is less than the maximum transmit power, the target transmit power is the adjusted power.

13. A communication method, characterized in that, Applied to network devices, the method includes: Receive Msg3 messages from multiple terminal devices; Msg4 is sent to the target terminal device among the plurality of terminal devices. The Msg4 carries first information, which is used to determine the target transmit power. The target transmit power is obtained by adjusting the initial transmit power of the early detection reference signal based on the first path loss. The first path loss is the path loss estimated based on the Msg3. Receive the early detection reference signal transmitted by the target terminal device using the target transmission power.

14. The method according to claim 13, characterized in that, The first information is used to indicate the target's transmission power.

15. The method according to claim 13, characterized in that, The first information is used to indicate the adjustment step size; The target transmission power is obtained by adjusting the initial transmission power based on the adjustment step size.

16. The method according to claim 15, characterized in that, The first information is used to indicate the initial transmit power.

17. The method according to claim 15, characterized in that, Before sending Msg4 to the target terminal device among the plurality of terminal devices, the method further includes: A system message is sent to the plurality of terminal devices, the system message carrying parameters related to the initial transmit power; the parameters related to the initial transmit power include at least one of the following: nominal reference power, bandwidth adjustment term, or first path loss fading coefficient.

18. The method according to claim 17, characterized in that, The initial transmit power is determined by the terminal device based on the nominal reference power, the bandwidth adjustment term, the first path loss fading coefficient, and the first path loss.

19. The method according to claim 18, characterized in that, The first path loss fading coefficient is a path loss fading coefficient that satisfies a first condition; wherein, the first condition includes: the first transmit power obtained based on the first path loss fading coefficient and the first path loss is less than or equal to the difference between the maximum transmit power and the power margin.

20. The method according to any one of claims 15-19, characterized in that, The adjustment step size corresponds to the first energy difference; wherein, the first energy difference is the absolute value of the difference between the expected received energy and the predicted received energy; The predicted received energy is determined based on the nominal reference power, bandwidth adjustment term, first path loss fading coefficient, and first path loss.

21. The method according to claim 20, characterized in that, The predicted received energy is the difference between the first transmit power and the first path loss, which is based on the first path loss fading coefficient and the first path loss.

22. The method according to any one of claims 13-19, characterized in that, The first path loss is the ratio of a first value to a second value; wherein the first value is the difference between the pre-configured power control parameters and the measured received power of Msg3; and the second value is the difference between 1 and the path loss fading coefficient of Msg3.

23. The method according to any one of claims 13-19, characterized in that, The target terminal device satisfies the second condition, wherein the second condition includes at least one of the following: The cyclic redundancy check of Msg3 sent by the terminal device passed. The payload integrity level of the terminal device is the highest among the plurality of terminal devices; the payload integrity level is determined based on whether the Msg3 sent by the terminal device contains the identification information of the terminal device, and / or whether the terminal device has the ability to send an early detection reference signal; The uplink shared channel PUSCH carrying Msg3 has the highest channel quality among the multiple terminal devices; Msg3 arrives at the network device earliest; The preset configuration value of the terminal device is the maximum.

24. The method according to any one of claims 13-19, characterized in that, If the power after adjusting the initial transmission power is greater than the maximum transmission power, the target transmission power is the maximum transmission power; If the power after adjusting the initial transmission power is greater than the maximum transmission power, the target transmission power is the adjusted power.

25. A communication device comprising one or more processors, a memory, and a computer program stored in the memory, characterized in that, The processor executes the computer program to implement the method of any one of claims 1-12, and / or to implement the method of any one of claims 13-24.

26. A chip system comprising a memory and a processor, characterized in that, When the program / instructions stored in the memory are executed by the processor, they implement the method of any one of claims 1-12, and / or the method of any one of claims 13-24.

27. A communication system, comprising terminal equipment and network equipment, characterized in that, The terminal device is used to implement the method according to any one of claims 1-12; The network device is used to implement the method of any one of claims 13-24.

28. A computer-readable storage medium having a computer program / instructions stored thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the method of any one of claims 1-12, and / or the method of any one of claims 13-24.

29. A computer program product, characterized in that, The computer program product includes: a computer program or instructions that, when run on a computer, cause the computer to perform the method of any one of claims 1-12, and / or implement the method of any one of claims 13-24.

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