Communication method and apparatus

Abstract

The embodiment of the application provides a communication method and device, and relates to the technical field of communication. In the case that a terminal device is in a connected state, a network device can pre-configure a reference signal for the terminal device, so that in the case that the terminal device is in a non-connected state (such as an idle state), channel measurement can be performed based on the reference signal, which replaces the mode of performing channel measurement through broadcast SSB, and significantly reduces the broadcast energy consumption of the network device side and the measurement energy consumption of the terminal device.

Description

Technical Field

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

[0002] In the field of communications, networks operate in high-frequency or ultra-high-frequency bands (such as millimeter waves or terahertz bands), and network equipment employs massive MIMO antenna arrays to achieve spatial coverage through numerous narrow beams. Network deployment is becoming increasingly dense, requiring the simultaneous maintenance of beam resources in multiple directions within a single cell. Simultaneously, terminal devices in the network exhibit service characteristics of "long periods of idle time and short periods of activation," such as standby for mobile terminals, periodic reporting by IoT terminals, and inactive phases for extended reality (XR) terminals. Against this backdrop, network design faces multiple challenges. Ensuring that terminal devices can be promptly woken up, quickly restore connections, and support mobility while meeting the requirements of green low-power consumption, on-demand transmission, and high energy efficiency operation has become a pressing issue.

[0003] Under normal circumstances, terminal devices in idle state can periodically perform tasks such as data synchronization, signal quality assessment, and beam availability maintenance. However, performing these tasks in idle state may result in significant device power consumption. Summary of the Invention

[0004] This application provides a communication method and apparatus, which are applied in the field of communication technology. The terminal device can pre-configure a reference signal in the connected state and perform channel measurement based on the reference signal after switching to the disconnected state, so as to save device power consumption.

[0005] In a first aspect, embodiments of this application propose a communication method. When the terminal device is in a connected state, the terminal device can receive a reference signal from the network device. When the terminal device is in a disconnected state, the terminal device can also receive a first SSB from the network device. The terminal device performs time and frequency synchronization based on the first SSB, and the terminal device can also perform channel measurement based on a pre-configured reference signal.

[0006] The non-connected state may include the idle state and the inactive state described in the embodiments of this application.

[0007] This method replaces the channel measurement method via broadcast SSB, significantly reducing the broadcast power consumption on the network device side and the measurement power consumption on the terminal device.

[0008] The first SSB includes: a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a beam identifier. The beam identifier is used to identify the beam associated with the first SSB. The first SSB does not contain a physical broadcast channel (PBCH).

[0009] It is understood that the embodiments of this application involve a simplified first SSB, which removes the PBCH and its associated DMRS reference signal. This allows for basic time and frequency synchronization based on the first SSB, while reducing the power consumption caused by transmitting and receiving the first SSB, thereby improving the synchronization detection speed of the terminal device.

[0010] In one possible implementation, the reference signal includes a Channel State Information Reference Signal (CSI-RS) resource set, with N beams corresponding to the CSI-RS resource set and M beams between the terminal device and the network device, where N is less than M and both N and M are positive integers.

[0011] Terminal devices can reduce measurement power consumption by measuring a small number of CSI-RS resource sets. At the same time, the narrow beam characteristics of CSI-RS result in a higher signal-to-noise ratio and improved beam management accuracy.

[0012] In one possible implementation, the method further includes: when the terminal device is in a connected state, receiving first information, the first information indicating uplink resources, the uplink resources being used for data reporting when the terminal device is in a disconnected state.

[0013] By pre-configuring uplink resources, terminal devices in non-connected states can report data without having to perform the traditional random access procedure, thereby reducing the latency and additional energy consumption caused by multiple signal interactions during the random access process.

[0014] In one possible implementation, the beams corresponding to the CSI-RS resource set include serving beams and non-serving beams. When the terminal device is in a connected state, the terminal device receives second information from the network device. The second information indicates one or more of the following: a first threshold value for measuring the reference signal received power RSRP of the serving beam, a second threshold value for measuring the signal fluctuation between the serving beam and the non-serving beam, or a third threshold value, wherein the third threshold value is the duration of the measurement.

[0015] Network devices can configure threshold values ​​when terminal devices are in a connected state, enabling terminal devices to autonomously determine the beam after transitioning from a connected state to a disconnected state, thereby reducing unnecessary measurement reporting and signaling interactions with network devices.

[0016] In one possible implementation, the method further includes: when a triggering condition is detected, sending third information based on uplink resources, so that the terminal device in the non-connected state can report the third information based on uplink resources without going through a random access procedure.

[0017] In one possible implementation, the triggering condition includes one or more of the following: the RSRP of the serving beam is less than a first threshold, the difference between the RSRP of the serving beam and the RSRP of the non-serving beam is greater than a second threshold, or the duration for which the RSRP of the serving beam is less than the first threshold is greater than a third threshold, or the duration for which the difference is greater than the second threshold is greater than the third threshold.

[0018] Secondly, embodiments of this application propose a communication method. When the terminal device is in a connected state, the network device sends a reference signal to the terminal device. The reference signal is used to perform channel measurement when the terminal device switches from a connected state to a disconnected state. When the terminal device is in a disconnected state, the network device sends a first SSB to the terminal device.

[0019] Using a reference signal instead of broadcasting the SSB for channel measurement significantly reduces the broadcast power consumption on the network device side and the measurement power consumption on the terminal device side.

[0020] The first SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a beam identifier. The beam identifier identifies the beam associated with the first SSB. The first SSB does not contain the physical broadcast channel (PBCH). Simplifying the first SSB effectively reduces the broadcast duty cycle of network devices and reduces broadcast overhead.

[0021] In one possible implementation, the reference signal is the Channel State Information Reference Signal (CSI-RS) resource set, with N beams corresponding to the CSI-RS resource set, and M beams between the terminal device and the network device, where N is less than M and both N and M are positive integers.

[0022] Network devices replace the traditional whole-cell broadcast mode by sending N beams of CSI-RS resource sets to terminal devices in a targeted manner, thereby reducing the resource overhead caused by transmitting CSI-RS resource sets on invalid beams.

[0023] In one possible implementation, when the terminal device is in a connected state, the network device sends first information to the terminal device, the first information indicating uplink resources, which are used for data reporting when the terminal device is in a disconnected state.

[0024] Network devices reduce energy consumption caused by frequent signal interactions between terminal devices and network devices when the terminal devices are in a disconnected state by pre-configuring uplink resources for terminal devices.

[0025] In one possible implementation, the beams corresponding to the CSI-RS resource set include serving beams and non-serving beams. When the terminal device is in a connected state, it sends second information indicating one or more of the following: a first threshold value for measuring the reference signal received power RSRP of the serving beam, a second threshold value for measuring the signal fluctuation between the serving beam and the non-serving beam, or a third threshold value, wherein the third threshold value is the duration of the measurement.

[0026] Network devices can configure threshold values ​​when terminal devices are in a connected state, enabling terminal devices to autonomously determine the beam after transitioning from a connected state to a disconnected state, thereby reducing unnecessary measurement reporting and signaling interactions with network devices.

[0027] In one possible implementation, the method further includes: the network device receiving third information from the terminal device, wherein the third information is received when the triggering condition is met.

[0028] In one possible implementation, the triggering condition includes one or more of the following: the RSRP of the serving beam is less than a first threshold, the difference between the RSRP of the serving beam and the RSRP of the non-serving beam is greater than a second threshold, or the duration for which the RSRP of the serving beam is less than the first threshold is greater than a third threshold, or the duration for which the difference is greater than the second threshold is greater than the third threshold.

[0029] Thirdly, embodiments of this application propose a communication system, including: a network device and a terminal device, wherein the terminal device is used to execute the method described in the first aspect or any possible implementation of the first aspect, and the network device is used to execute the method described in the second aspect or any possible implementation of the second aspect.

[0030] Fourthly, embodiments of this application provide a communication device, which may be an electronic device, or a chip or chip system within an electronic device. The communication device may include a display unit and a processing unit. When the communication device is an electronic device, the display unit may be a display screen. The display unit is used to perform display steps to enable the electronic device to implement a communication method described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. When the communication device is an electronic device, the processing unit may be a processor. The communication device may further include a storage unit, which may be a memory. The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit to enable the electronic device to implement a communication method described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. When the communication device is a chip or chip system within an electronic device, the processing unit may be a processor. The processing unit executes the instructions stored in the storage unit to enable the electronic device to implement a communication method described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. The storage unit can be a storage unit inside the chip (e.g., a register, cache, etc.) or a storage unit located outside the chip within the electronic device (e.g., a read-only memory, random access memory, etc.).

[0031] Fifthly, embodiments of this application provide an electronic device including a processor and a memory, wherein the memory is used to store computer execution instructions, and the processor is used to run the computer execution instructions stored in the memory to perform the methods described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect.

[0032] Sixthly, embodiments of this application provide a computer-readable storage medium storing a computer program or instructions that, when executed on a computer, cause the computer to perform the methods described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect.

[0033] In a seventh aspect, embodiments of this application provide a computer program product including a computer program, which, when run, causes the computer to perform the methods described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect.

[0034] Eighthly, this application provides a chip or chip system including at least one processor and a communication interface. The communication interface and the at least one processor are interconnected via a circuit. The at least one processor is used to run computer programs or instructions to perform the methods described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. The communication interface in the chip can be an input / output interface, pins, or circuits, etc.

[0035] In one possible implementation, the chip or chip system described above in this application further includes at least one memory storing instructions. The memory can be an internal storage unit of the chip, such as a register or cache, or it can be a storage unit of the chip itself (e.g., read-only memory, random access memory, etc.).

[0036] It should be understood that the third to eighth aspects of this application correspond to the technical solutions of the first and second aspects of this application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation are similar, and will not be repeated here. Attached Figure Description

[0037] Figure 1 A scenario diagram provided for an embodiment of this application;

[0038] Figure 2 This is a flowchart illustrating a communication method.

[0039] Figure 3 A flowchart illustrating a communication method provided in an embodiment of this application;

[0040] Figure 4 A flowchart illustrating another communication method provided in an embodiment of this application;

[0041] Figure 5 This is a schematic diagram of another scenario provided for an embodiment of this application. Detailed Implementation

[0042] To facilitate a clear description of the technical solutions in the embodiments of this application, some terms and technologies involved in the embodiments of this application will be briefly introduced below:

[0043] 1. Mobile communication system

[0044] Mobile communication systems can be simply referred to as communication systems. The technical solutions of the embodiments in this application can be applied to various communication systems. Communication systems include, for example: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, 5th Generation (5G) systems, 6G systems, New Radio (NR) systems, or future evolution communication systems, etc.

[0045] A communication system may include network devices and terminal devices. Terminal devices and network devices are connected via an air interface, which can be understood as the wireless transmission medium connecting the terminal devices and the network devices. Network devices can transmit data or control signaling to the terminals through the air interface.

[0046] 2. Network equipment

[0047] Network equipment can be access network equipment, radio access network (RAN) equipment, RAN base station controllers, or core network-side equipment. For example, network equipment can be a base station, transmission reception point (TRP), evolved NodeB (eNB or eNodeB) in an LTE system, home base station (e.g., home evolved NodeB, or home Node B, HNB), base band unit (BBU), radio controller, relay station, access point, vehicle-mounted equipment, wearable devices in cloud radio access networks (CRAN) scenarios, and network equipment in 5G networks, future evolved PLMN networks, access points (APs) in WLANs, or next-generation NodeBs (gNBs) in new radio (NR) systems. Base stations can be city base stations, micro base stations, pico base stations, femtobase stations, etc., and this application embodiment does not limit this.

[0048] In this embodiment of the application, the network device can support beam transmission and coverage capabilities, and can send synchronization signal blocks (SSBs) to the coverage area to maintain the synchronization and reachability of terminal devices, and supports radio resource control state management and the switching of terminal devices between connected and idle states.

[0049] For example, during the phase when a terminal device accesses a network device, the network device transmits SSBs for cell discovery and coarse orientation awareness, including SSBs transmitted using wide beams and SSBs transmitted using narrow beams, to support the terminal device in completing processes such as initial synchronization, coarse orientation positioning, and random access.

[0050] After the terminal device enters the connected state, the network device no longer relies on the full-featured SSB for continuous broadcasting. Instead, it uses a simplified SSB (or first SSB) as the beam direction anchor point in the connected state. The simplified SSB retains at least the synchronization sequence (such as the primary synchronization signal (PSS) and the secondary synchronization signal (SSS)) and carries the beam identifier to provide the terminal device with fine synchronization and beam identifier reference, while reducing broadcast overhead.

[0051] When a terminal device transitions from a connected state to an idle state, the network device sends pre-configuration parameters required for idle state operation to the terminal device via connection release signaling (such as radio resource control release, or RRC release for short). These pre-configuration parameters may include reference signals, such as the channel state information reference signal (CSI-RS) resource set.

[0052] When the terminal device is in an idle state, the network device no longer continuously broadcasts a large number of narrow beam SSBs. Instead, the network device sends simplified SSBs in a long-period manner to maintain the basic synchronization capability of the terminal device.

[0053] 3. Terminal equipment

[0054] Terminal devices may include handheld devices with communication functions, vehicle-mounted devices, etc. For example, some terminal devices include: mobile phones, tablets, PDAs, laptops, mobile internet devices (MIDs), virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, terminal devices in 5G networks, or future public land mobile communication networks. Terminal devices in a network (PLMN), etc., are not limited to this in the embodiments of this application.

[0055] As an example and not a limitation, the terminal device can also be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for devices that utilize wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothing or accessories.

[0056] In addition, terminal devices can also be terminal devices in Internet of Things (IoT) systems. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.

[0057] Terminal devices can also be vehicles (as described in Scenario 2), drones, or satellites.

[0058] The terminal device in this application embodiment may also be referred to as: terminal, user equipment (UE), mobile station (MS), mobile terminal (MT), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication equipment, user agent, or user device, etc.

[0059] In this embodiment, the terminal device supports different RRC states such as idle state and connected state, and can periodically wake up in the idle state to detect and measure downlink signals, and initiate access or connection recovery requests to the network device when communication is needed.

[0060] After the terminal completes initial access and enters the connected state, the terminal device can receive and utilize the simplified SSB sent by the network device for beam measurement and direction maintenance. When the terminal device is about to enter the idle state, it receives pre-configuration parameters from the network device via RRCrelease and stores these parameters as the idle state operating rules.

[0061] During the idle state, the terminal device periodically wakes up in a low-power manner according to pre-configured parameters. During wake-up, the terminal device receives a simplified SSB to maintain time and frequency synchronization and confirms the corresponding cell and beam (including serving and non-serving beams). Additionally, the terminal device measures the CSI-RS resource set in the pre-configured parameters.

[0062] The terminal device compares the measurement results obtained with multiple threshold values ​​in the pre-configured parameters and autonomously determines whether to trigger an uplink. When the triggering conditions are met, the terminal device directly uses the uplink resources in the pre-configured parameters to report to the network device, thereby avoiding the execution of a random access procedure.

[0063] Furthermore, after receiving a response from the network device, the terminal device can continue to operate in an idle state, or quickly enter a connected state to resume communication as needed.

[0064] In this embodiment, the network device and the terminal device form a collaborative working relationship through a connection-state pre-configuration and idle-state on-demand signal transmission mechanism.

[0065] It is understood that the products and systems involved in the embodiments of this application mainly include network equipment, terminal equipment, and cellular communication systems and related air interface protocol mechanisms constituted therefrom. Among them, the cellular communication system and its air interface protocol mechanisms include idle-state synchronization mechanisms, beam management mechanisms, and connection recovery mechanisms, involving downlink synchronization signal design, channel measurement, and uplink access procedures, etc.

[0066] The electronic device in the embodiments of this application can be a terminal device or a network device.

[0067] 4. RRC status of terminal equipment

[0068] RRC states can include: connected state, idle state, and inactive state.

[0069] The connected state can be identified by RRC_IDLE.

[0070] The connected state can be understood as a state in which an active context has been established with the network device, its mobility is controlled by the network device, and it can be directly scheduled by the network device at the cell / beam level for efficient data transmission. The network device maintains a complete context for the terminal device, which may include: security keys, bearer configuration, UE capability information, etc.

[0071] The idle state can be identified by RRC_CONNECTED.

[0072] The idle state can be understood as a low-power state in which network registration has been completed, there is no active context in the network device, the terminal device performs cell selection / reselection and mobility management autonomously, and receives network calls by periodically detecting paging.

[0073] The inactive state can be identified by RRC_INACTIVE.

[0074] The inactive state can be understood as: an intermediate state in which the connection is maintained in the core network, the context is suspended and retained in the network device, the terminal device autonomously performs mobility management in the notification area of ​​the network device, and it can be woken up by paging in the network device and supports fast connection recovery or small data transmission.

[0075] The idle state and the inactive state can also be collectively referred to as the non-connected state.

[0076] In the communication method described in the embodiments of this application, the disconnected state is taken as an example of the idle state, and this example does not constitute a limitation on the embodiments of this application.

[0077] 5. Other terms

[0078] In the embodiments of this application, terms such as "first" and "second" are used to distinguish identical or similar items with substantially the same function and purpose. For example, "first chip" and "second chip" are used only to distinguish different chips and do not limit their order of execution. Those skilled in the art will understand that terms such as "first" and "second" do not limit the quantity or execution order, and that "first" and "second" do not necessarily imply that they are different.

[0079] It should be noted that, in the embodiments of this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design scheme described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design schemes. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0080] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, a--c, bc, or abc, where a, b, and c can be single or multiple.

[0081] In the embodiments of this application, pre-configuration can be understood as preset, pre-defined, defined, pre-defined, stored, pre-stored, pre-negotiated, pre-made, or preset, etc.

[0082] In the embodiments of this application, "sending" and "receiving" indicate the direction of signal transmission. For example, "sending information to a network device" can be understood as the destination of the information being the network device. This can include sending directly through the air interface, or sending indirectly through the air interface by other units or modules. It can also include the baseband chip sending information to the radio frequency module through pins or interface circuits / modules, and finally the radio frequency module sending the information to the base station. "Receiving information from a terminal device" can be understood as the source of the information being the terminal device. This can include receiving directly from the terminal device through the air interface, or receiving indirectly from the terminal device through the air interface by other units or modules. It can also include the radio frequency unit receiving information from the base station, and the baseband chip receiving this information from the radio frequency module through pins or interface circuits / modules. "Sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface.

[0083] In other words, sending and receiving can occur between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules, or hardware modules within the device via buses, wiring, or interfaces.

[0084] It is understandable that information may undergo necessary processing, such as encoding and modulation, between the source and destination, but the destination can understand the valid information from the source. Similar statements in this application can be interpreted in a similar way and will not be elaborated further.

[0085] In the embodiments of this application, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, an apparatus, system, product or device that includes a series of modules, units or units is not necessarily limited to those modules, units or units that are explicitly listed, but may include other modules, units or units that are not explicitly listed or that are inherent to such apparatus, system, product or device.

[0086] "Instruction" can include direct instruction, indirect instruction, explicit instruction, and implicit instruction. When describing a certain instruction information to indicate A, it can be understood that the instruction information carries A, directly indicates A, or indirectly indicates A.

[0087] In this embodiment, the terminal device or various network devices include a hardware layer, an operating system layer running on top of the hardware layer, and an application layer running on top of the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as Linux, Unix, Android, iOS, or Windows. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software.

[0088] like Figure 1 As shown, a communication system may include network devices (such as gNB) and terminal devices (such as UE). The synchronization, cell selection, and beam-related management operations of idle-state terminal devices mainly rely on the SSB periodically broadcast by the network devices.

[0089] For example, network devices periodically broadcast SSBs (including SSB1, SSB2 to SSBN) in different directions. Idle terminal devices, after periodically waking up, can scan and detect multiple SSBs, such as SSB1, SSB2 to SSBN, thereby achieving time and frequency synchronization and performing cell selection and channel measurement based on the measurement results of multiple SSBs. When a terminal device needs to restore communication, it typically needs to re-execute the random access procedure.

[0090] For specific communication methods, please refer to Figure 2The description in the document is as follows. It is understood that the communication method may include the connection establishment process shown in stage 1, referring to the steps shown in S201-S210, and the beam maintenance and fault recovery process shown in stage 2, referring to the steps shown in S211-S214.

[0091] S201. Network equipment uses wide-beam transmission SSB.

[0092] Network devices continuously broadcast SSBs, such as periodically broadcasting SSBs in different directions. This continuous broadcasting incurs high overhead.

[0093] S202. The terminal equipment uses a narrow beam to receive SSB.

[0094] S203. The terminal device sends a message (MSG) to the network device.

[0095] In MSG1, the terminal device sends the preamble via the physical random access channel (PRACH).

[0096] S204. The network device sends MSG2 to the terminal device.

[0097] MSG2 can be understood as the response message received by the network device from MSG1, or as a random access response.

[0098] S205, The terminal device sends MSG3 to the network device.

[0099] MSG3 can be used to establish a connection. For example, MSG3 is an RRC message, and it can include the identifier of the terminal device.

[0100] S206. The network device sends MSG4 to the terminal device.

[0101] MSG4 can be understood as a race-resolved message.

[0102] Understandably, the core of MSG4 is to allow the terminal device to determine whether its random access attempt is successful or failed by receiving and decoding MSG4. For a successful terminal device, MSG4 carries the command to establish an RRC connection; for a failed terminal device, MSG4 can be understood as notifying the terminal device that it needs to exit and retry.

[0103] S203-S206 are random access procedures. Based on the random access procedure, the terminal device establishes a connection with the network device, and the terminal device enters the connected state.

[0104] When the terminal device is in a connected state, the terminal device periodically performs channel measurement and time and frequency synchronization based on the SSB in S201.

[0105] S207. The terminal device sends the SSB identifier (identity, ID) to the network device.

[0106] The terminal device periodically performs time and frequency synchronization and channel measurement based on the SSB in S201, detects the signal quality of the beam, and indicates the optimal beam direction by sending the SSB ID.

[0107] S208. Network devices use narrow beams to transmit channel state information reference signals (CSI-RS).

[0108] The CSI-RS transmitted by the network device is a reference signal transmitted based on the optimal beam direction in S207.

[0109] Network devices periodically transmit CSI-RS for more accurate beam measurements.

[0110] S209. The terminal device sends the Channel State Information Reference Signal Resource Indicator (CSI - RSresource Indicator, CRI) and Reference Signal Received Power (RSRP) to the network device.

[0111] After performing channel measurements, the terminal device reports the optimal CSI-RS resource set, i.e., the identifier of the optimal beam, and the RSRP corresponding to the optimal beam to the network device via CRI.

[0112] S210. The network device sends a receive quasi-colocation (RXQCL) to the terminal device.

[0113] RX QCL can be used to help terminal devices properly demodulate beam signals.

[0114] S211. The terminal equipment uses a narrow beam to receive SSB.

[0115] The terminal device continuously monitors beam quality based on the SSB in S201. If a quality degradation is detected, beam fault detection is triggered.

[0116] S212. When the network device detects that the signal quality of the beam does not meet the preset conditions, a narrow beam is used to transmit the SSB.

[0117] S213. The terminal device sends a beam failure recovery request (BFRQ) to the network device.

[0118] BFRQ can be used to recover beams. For example, a terminal device can send a BFRQ to a network device and recommend new candidate beams.

[0119] S214. The network device sends a beam failure recovery response (BFRR) to the terminal device.

[0120] BFRR can be understood as a response message to BFRQ, indicating that beam recovery is complete. For example, network devices can use BFRR to confirm the beam recovery process and configure new serving beams for terminal devices.

[0121] It is understandable that even when the terminal device is in an idle state, it can still periodically perform channel measurements and time and frequency synchronization based on the SSB in S201.

[0122] based on Figure 2 The communication method shown can meet basic communication needs in low-to-medium frequency scenarios with a limited number of beams, but it has certain limitations in future high-frequency, multi-beam communication environments.

[0123] From the perspective of the terminal device, in the idle state, the terminal device needs to be periodically woken up to scan and measure multiple SSBs from different directions to complete time and frequency synchronization and channel quality measurement. The scanning and measurement process usually requires the terminal device to repeatedly activate the RF receiving link and perform multiple measurement operations. Under high-frequency and narrow-beam conditions, in order to obtain reliable measurement results, the terminal device often needs to measure more beam directions, which increases the measurement time and the number of measurements. This makes it difficult to effectively reduce the power consumption of the terminal device in the idle state. In long standby scenarios, the battery consumption of the terminal device is significantly accelerated, reducing the terminal device's battery life, which is particularly detrimental to power-sensitive IoT terminal devices and wearable devices.

[0124] From the perspective of network equipment operation, in order to ensure that terminal devices in any direction within the coverage area can complete synchronization and cell detection in idle state, network equipment needs to continuously (e.g., periodically) broadcast SSBs in multiple directions. Even if there are no idle terminal devices in certain time periods or spatial areas, or only a very small number of terminal devices exist, the network equipment still needs to maintain the transmission of SSBs in all beam directions. It is difficult for network equipment to dynamically adjust according to the actual distribution of terminal devices. In high-frequency, multi-beam communication scenarios, the number of SSBs increases significantly with the increase in antenna array size and beam accuracy, leading to a continuous increase in the proportion of radio resources occupied by SSBs and a continuous increase in the transmission power consumption of network equipment, thus creating a significant contradiction between system coverage capability and energy efficiency.

[0125] In existing idle-state mechanisms, the Signal Segment Bus (SSB) typically needs to simultaneously perform multiple functions, including time and frequency synchronization, cell detection, channel measurement, and beam-related management, resulting in high coupling between these functions. Because the SSB must meet basic requirements for full coverage and detectability, its transmission method is often primarily broadcast, making it difficult to fine-tune configurations to meet the actual needs of terminal devices. This functionally coupled design makes it difficult for the system to perform on-demand measurement or targeted maintenance of beam states in the idle state, limiting the network's capabilities in energy efficiency optimization and flexible scheduling.

[0126] Regarding state coordination, the mechanisms between connected and idle states in existing systems are relatively independent. Beam information, channel status, and related configuration information acquired by the terminal device during the connected state often cannot be effectively retained or reused after entering the idle state. The terminal device needs to rely on the SSB again for scanning and measurement. This lack of coordination between states causes the terminal device to repeatedly perform similar measurement processes in different states, increasing not only the terminal device's power consumption but also the burden of transmitting synchronization signals for the network equipment.

[0127] In view of this, embodiments of this application provide a communication method in which, when the terminal device is in a connected state, the network device can pre-configure a reference signal for the terminal device. In this way, when the terminal device is in a disconnected state (such as an idle state), channel measurement can be performed based on the reference signal, which replaces the method of channel measurement by broadcasting SSB, and significantly reduces the broadcast power consumption on the network device side and the measurement power consumption of the terminal device.

[0128] In this embodiment, when the terminal device is in a connected state, the network device can configure pre-configured parameters for the terminal device. These pre-configured parameters may include one or more of the following: a reference signal, at least one threshold value for measuring channel quality, and uplink resources. Thus, when the terminal device is in a disconnected state, it can perform channel measurements and data reporting based on the pre-configured parameters.

[0129] Figure 3 This is a flowchart illustrating a communication method provided in an embodiment of this application. Figure 3 The example provided illustrates the communication method using a reference signal included in the pre-configured parameters; however, this example does not constitute a limitation on the embodiments of this application. Figure 3 As shown, the communication method may include the following steps:

[0130] S301. When the terminal device is in a connected state, the network device sends a reference signal to the terminal device.

[0131] Adaptably, the terminal device can store the reference signal after receiving it.

[0132] Reference signals can be carried in the RRCrelease message.

[0133] The reference signals may include: a Channel State Information Reference Signal (CSI-RS) resource set, with N beams corresponding to the CSI-RS resource set, and M beams between the terminal device and the network device, where N is less than M, and both N and M are positive integers. By selecting N beams from the M beams for measurement, the traditional full-beam measurement is replaced, thus reducing invalid beam broadcasting.

[0134] The CSI-RS resource set may include: a first CSI-RS resource set corresponding to the serving beam, and a second CSI-RS resource set corresponding to the non-serving beam.

[0135] The first CSI-RS resource set can be used to enable the detection of the serving beam.

[0136] The first CSI-RS resource set may include: the first CSI-RS resource ID (e.g., 1), the beam type being a serving beam, and the serving beam ID.

[0137] For example, the CSI-RS resources associated with the first CSI-RS resource ID may include: time-frequency parameters, power parameters, and TCI status ID, etc.

[0138] Time-frequency parameters and power parameters can be used to perform channel measurements, and the TCI state ID can be used to indicate the uniquely associated beam direction. The beam indicated by the currently active TCI state ID of the terminal device is the serving beam, and the number of serving beams is 1.

[0139] The second CSI-RS resource set can be used to detect non-serving beams. Non-serving beams may also be referred to as neighboring beams or candidate beams. If there is at least one non-serving beam, then there is at least one second CSI-RS resource set.

[0140] The second CSI-RS resource set may include: a second CSI-RS resource ID (e.g., 2), a beam type of non-serving beam, and a non-serving beam ID. The content associated with the second CSI-RS resource ID can be similar to the content associated with the first CSI-RS resource ID, and will not be repeated here.

[0141] The beam indicated by the TCI status ID that is currently not activated on the terminal device is a non-serving beam.

[0142] When the number of non-serving beams is 2, the non-serving beams may include the primary non-serving beam, or the non-serving beam most likely to be switched, and the secondary non-serving beam, or the non-serving beam that is less likely to be switched.

[0143] Optionally, the network device may send a group ID at the same time as sending a reference signal.

[0144] For example, network devices can group geographically adjacent and similarly mobile terminal devices into a group and assign a group ID. All terminal devices within a group share the same group ID and pre-configured parameters (such as reference signals). The network device sends reference signals based on the group ID, and the terminal devices determine whether the reference signal belongs to their group by identifying the group ID.

[0145] Understandably, when a terminal device performs channel measurements based on a reference signal and reports them to the network device, it needs to carry a demodulation reference signal (DMRS) sequence. The DMRS sequence is used to distinguish terminal devices. Although the reference signal is shared by group, terminal devices must differentiate between them when reporting: multiple terminal devices within a group may trigger reporting simultaneously. In this case, different DMRS sequences can be used (e.g., distinguished by the dmrsSequenceID field). For example, if the reported UE dmrsSequenceID = f(GroupID, UE ID), and all terminal devices within the group use the same uplink resource block (RB), the network device can identify the terminal device's identity through the DMRS sequence, achieving intra-group differentiation.

[0146] In this way, by grouping terminal devices, network devices can share pre-configured parameters, which can be reused among multiple terminal devices, significantly improving the resource utilization of network devices.

[0147] Optionally, the network device may also carry one or more of the following pre-configured parameters when sending the reference signal: long-period SSB configuration parameters, idle state measurement period, time-domain configuration parameters, or frequency-domain configuration parameters.

[0148] Long-cycle SSB configuration parameters may include one or more of the following: SSB transmission period, SSB subcarrier spacing, and wake-up alignment indicator.

[0149] The SSB transmission period can be used to indicate the transmission period of the first SSB, which can be a simplified SSB. The contents of the first SSB can be described in Table 1 below. The SSB transmission period can be identified by the longSSBPeriodicityMs field, and the value of the SSB transmission period can be 160ms.

[0150] The SSB subcarrier spacing can be identified by the ssbSubcarrierSpacing field, and the SSB transmission period can be 15kHz, 30kHz, or 60kHz.

[0151] The wakeup alignment indicator can be used to indicate whether the wakeup cycle of a terminal device needs to be adjusted. The wakeup alignment indicator can be identified by the wakeupAlignmentindicator field, and its value can be true or false.

[0152] The idle state measurement period can be understood as the period during which the terminal device performs channel measurements when it is in an idle state. For example, the idle state measurement period can be set to 80ms.

[0153] Time-domain configuration parameters can be identified through the TimeDomainConfig field. These parameters can be used to indicate the symbol position and transmission period of the reference signal.

[0154] Time-domain configuration parameters may include: reference signal transmission period and / or reference signal measurement window.

[0155] When the reference signal is a CSI-RS resource set, the reference signal transmission period can also be called the CSI-RS transmission period, which can be 40ms or 80ms, etc. The reference signal measurement window can also be called the CSI-RS measurement window. The duration of the CSI-RS measurement window is 5 symbols, including: the duration for stabilizing the radio frequency (e.g., 2 symbols), the duration for receiving the reference signal (e.g., 2 symbols), and the duration for channel measurement (e.g., 1 symbol).

[0156] Frequency domain configuration parameters can be used to indicate the specific position of the reference signal in the frequency domain of the terminal device, enabling the terminal device to perform accurate measurements without full bandwidth scanning.

[0157] Frequency domain configuration parameters may include the starting resource block and the number of resource blocks.

[0158] The start resource block can be used to indicate the starting position of the reference signal within the carrier bandwidth, such as setting it to 100.

[0159] The resource block count can be used to indicate the number of consecutive resource blocks occupied by the reference signal, such as setting it to 24.

[0160] In this way, network devices can assign a fixed frequency domain location to each group ID by fixing the starting resource location. Unified planning on the network side avoids resource conflicts. By selecting a suitable bandwidth of 24 resource blocks (approximately 4.32MHz), a stable measurement reference can be provided.

[0161] S302. When the terminal device is in a disconnected state, the network device sends the first SSB to the terminal device.

[0162] The non-connected state can include the idle state and the inactive state.

[0163] The first SSB includes: PSS, SSS, and beam identifier. The beam identifier is used to identify the beam associated with the first SSB.

[0164] The first SSB does not include the physical broadcast channel (PBCH) or the master information block (MIB) data carried by the PBCH. The MIB data may include the system frame number and the physical downlink control channel (PDCCH) configuration, such as the PDCCH configuration used to schedule system information block type 1 (SIB1).

[0165] The first SSB uses a structure of four orthogonal frequency division multiplexing (OFDM) symbols, with the same symbol positions as the standard SSB, retaining only the synchronization function and adding beam identification. The differences in OFDM symbol indices between the standard SSB and the first SSB are illustrated below with reference to Table 1.

[0166] Table 1. Analysis of OFDM Symbol Index Differences between the First SSB and the Standard SSB

[0167]

[0168] As shown in Table 1, the standard SSB includes PSS, SSS, and PBCH. This application's embodiments, designed for terminals that have completed initial access, present a simplified first SSB, removing the PBCH and its associated DMRS reference signal, retaining only the synchronization pulse and a simplified beam identifier. Furthermore, the SSB structure is simplified to four OFDM symbols: symbol 0 is the PSS, symbol 1 is empty, symbol 2 is the SSS, and symbol 3 is the beam identifier. This beam identifier directly serves as an anchor point, guiding the terminal to quickly match the pre-configured parameters transmitted by RRCrelease, eliminating the need for complex channel decoding.

[0169] This solves the problem of wasted air interface resources caused by synchronized terminals repeatedly receiving and decoding static system information (such as MIB) that has already been acquired and remains unchanged for a long time, even when in connected or idle states. It also addresses the constant power consumption burden on base stations due to continuous high-power transmission of the PBCH. The broadcast duty cycle on the network equipment side is significantly reduced, and the normalized broadcast power overhead per station is reduced by approximately 15%-20%. Due to the extremely simplified signal structure, the synchronization detection speed of the terminal is faster, providing solid physical layer support for achieving "zero-point energy efficiency" for the base station and "instant wake-up" for the terminal.

[0170] The following example illustrates the configuration differences between the first SSB and the standard SSB, using Table 2 as an example.

[0171] Table 2. Analysis of Configuration Differences between the First SSB and the Standard SSB

[0172]

[0173] As shown in Table 2, network devices can reduce continuous energy consumption in beam directions where there is no terminal demand by reducing the number of beams corresponding to the first SSB, extending the transmission period of the first SSB, or transmitting the first SSB in the beam direction of the connected terminal device.

[0174] By combining the pre-configuration of the reference signal in S301, this embodiment of the application can form a decoupled architecture of "coarse synchronization + fine measurement" by combining the reference signal with the first SSB. For example, this embodiment of the application uses the first SSB with a long period of 160ms to handle the simplified frequency / time synchronization, while beam management is handled by the CSI-RS resource set pre-configured in the connection state. The network device can directionally transmit 1-2 CSI-RS resource sets (associated with the serving beam and neighboring beams) only within the UE's measurement window, replacing the traditional whole-cell broadcast mode. The measurement window of the terminal device is reduced from multiple consecutive time slots to only 5 OFDM symbols (approximately 0.36ms). The measurement power consumption of the terminal in the idle state can be reduced by more than 70%, while the narrow beam characteristics of CSI-RS result in a higher signal-to-noise ratio (SNR), and the beam management accuracy is improved by approximately 30%, achieving true dual-sided green energy efficiency.

[0175] S303, The terminal equipment synchronizes time and frequency based on the first SSB.

[0176] S304. The terminal equipment performs channel measurements based on the reference signal.

[0177] For example, upon receiving an RRCrelease message, the terminal device can determine whether it needs to switch from a connected state to a disconnected state and perform channel measurements based on the reference signal in the RRCrelease message.

[0178] based on Figure 3 As described, the terminal device can perform channel measurements based on reference signals to determine beam quality. If the measurement results corresponding to the serving beam meet the triggering conditions, the terminal device can select a more suitable beam from at least one non-serving beam to replace the existing serving beam. Thus, by configuring reference signals associated with the serving beam (such as a first CSI-RS resource set) and reference signals associated with non-serving beams (a second CSI-RS resource set) in the reference signals, the terminal can perform beam quality detection and beam switching determination.

[0179] Furthermore, the CSI-RS resource set can be understood as a dedicated downlink reference signal for a specific UE, and its configuration is usually individualized and only valid in Connected Mode. This application's embodiments break the limitation that idle-state measurements can only rely on SSBs, and design a multicast-based CSI-RS configuration architecture based on GroupID, extending the fine-grained channel state measurement mechanism, originally belonging to the unicast domain, to group-based management of idle-state conditions.

[0180] This GroupID approach addresses the resource constraints caused by the positive correlation between downlink reference signal overhead and terminal scale in 6G high-frequency multi-beam scenarios. With massive terminal access, allocating a separate CSI-RS port to each idle terminal leads to a significant decrease in physical resource block (PRB) utilization, crowding out data channel capacity. In this application's embodiment, during the RRC release phase, terminal devices are grouped based on spatial geographic consistency and channel correlation. The base station pre-configures a shared CSI-RS resource set (including symbol shift, subcarrier spacing, and measurement window period) for all UEs under the same GroupID, enabling a single transmission to cover the entire group of terminals.

[0181] This reduces the signaling plane physical overhead required for network-side beam maintenance by more than 80%, significantly optimizing the system's spectral efficiency in narrow-beam measurement environments. Since the CSI-RS resource set has a higher spatial directivity gain than the SSB, the solution improves the RSRP measurement accuracy of beam management while reducing overhead. Combined with orthogonally derived DMRS sequences, the base station can achieve spatial diversity reception of concurrent handover reporting requests, greatly reducing the probability of access collisions and stabilizing connection recovery latency in the millisecond range.

[0182] In one possible implementation, when the terminal device is in a connected state, the terminal device receives second information from the network device, the second information indicating one or more of the following: a first threshold value for measuring the RSRP of the serving beam, a second threshold value for measuring the signal fluctuation between the serving beam and the non-serving beam, or a third threshold value, the third threshold value being the duration of the measurement.

[0183] The first threshold value can be identified through the thresholdRSRP field. For example, the first threshold value can also be set to a value such as -110dBm. If the signal quality of the serving beam is lower than -110dBm, the serving beam connection is determined to have failed.

[0184] The second threshold value can be identified through the hysteresis field. For example, the second threshold value can be set to a value such as 3dB. When the signal quality difference between the non-serving beam and the serving beam is greater than 3dB, it is determined that the serving beam can be switched to the non-serving beam. Setting the second threshold value can reduce beam switching caused by weak signal fluctuations.

[0185] The third threshold can be identified through the `timeToTrigger` field. For example, the third threshold can be set to a value such as 160ms. If the signal quality of the serving beam is lower than the first threshold for more than 160ms, and / or the signal quality difference between the non-serving beam and the serving beam is greater than the second threshold for more than 160ms, then it is determined that the serving beam can be switched to the non-serving beam. This configuration of the third threshold can reduce beam switching caused by instantaneous channel fluctuations.

[0186] For example, when the second information is an RRCrelease message, the RRCrelease message carries at least one pre-configured parameter, such as a first threshold value, a second threshold value, or a third threshold value. Alternatively, the second information can be other types of messages, which are not limited in this embodiment.

[0187] It is understandable that network devices can configure threshold values ​​when terminal devices are in a connected state, enabling terminal devices to autonomously determine the beam after transitioning from a connected state to a disconnected state, thereby reducing unnecessary measurement reporting and signaling interactions with network devices.

[0188] In one possible implementation, when the terminal device is in a connected state, it receives first information from the network device. This first information indicates uplink resources, which are used for data reporting when the terminal device is in a disconnected state.

[0189] Upstream resources can be identified through the ulResource field.

[0190] Network devices can also carry the following pre-configured parameters when sending uplink resources: parameters indicating time-frequency location and / or modulation and coding scheme (MCS).

[0191] For example, the uplink resources are fixed at 4 resources * 2 symbols. The MCS can be set to low-order quadrature phase shift keying (QPSK) modulation. This allows the uplink resources to use low-order modulation to improve the reliability of the reporting process.

[0192] Optionally, the network device can also pre-configure DMRS sequences for the terminal device. The DMRS sequence is identified by the dmrsSequenceID field and is derived from the groupID.

[0193] In situations where multiple terminal devices share the same uplink resources, network devices can differentiate and identify the reports from terminal devices by configuring different DMRS sequences for different terminal devices or by using a combination of UE ID and groupID, thereby reducing the probability of resource conflicts when multiple terminal devices trigger reports simultaneously.

[0194] Optionally, network devices can also pre-configure timers for terminal devices, which can be used to detect whether the pre-configured parameters have become invalid.

[0195] Pre-configured parameters can be identified via the validityTimer field. The timer can be set to 10 seconds. If the terminal device detects that the timer has exceeded 10 seconds, it determines that the pre-configured parameters have expired. At this time, the terminal device will automatically switch to the measurement and random access procedure based on the standard SSB as a built-in security fallback mechanism to ensure communication between the terminal device and the network device.

[0196] In this way, the timer is used to limit the effective time range of the pre-configured parameters. When the timer expires, or when the terminal device fails to successfully complete the measurement or reporting operation of the CSI-RS resource set based on the pre-configured parameters within the predetermined time, the terminal will automatically terminate the use of the pre-configured uplink resources and switch to the measurement and access mode based on the standard SSB.

[0197] For example, when the first message is an RRCrelease message, the pre-configuration parameters carried in the RRCrelease message may include: uplink resources, and the pre-configuration parameters may also include at least one of MCS, DMRS sequence or timer.

[0198] By pre-configuring the aforementioned uplink resources and the corresponding timers, this embodiment of the application achieves low latency and low power consumption reporting in idle state while ensuring that the terminal can still re-establish the connection by relying on the standard SSB in abnormal situations, thereby improving the overall robustness and reliability of the system.

[0199] In response to a message from a network device, a terminal device can switch from a connected state to an idle state.

[0200] When the terminal device is in an idle state, it can send third information based on uplink resources if it detects that the triggering conditions are met.

[0201] The triggering conditions include one or more of the following: the RSRP of the serving beam is less than a first threshold, the difference between the RSRP of the serving beam and the RSRP of the non-serving beam is greater than a second threshold, or the duration for which the RSRP of the serving beam is less than the first threshold is greater than a third threshold, or the duration for which the difference is greater than the second threshold is greater than the third threshold.

[0202] The third piece of information can be used to indicate a switch from a serving beam to a non-serving beam.

[0203] Therefore, when the terminal device is in an idle state, it can send measurement reporting information or connection recovery requests via uplink resources, provided that the measurement results meet the triggering conditions. By pre-configuring the aforementioned uplink resources, the terminal device can complete data reporting without executing the traditional random access procedure during the idle state, thereby avoiding the latency and additional energy consumption caused by multiple signal interactions during random access.

[0204] It is understood that the communication method described in the embodiments of this application may include three stages: the first stage is the initial discovery and access stage, the second stage is the pre-configuration stage in the connected state, and the third stage is the operation and maintenance stage in the idle state.

[0205] Phase 1: Initial Discovery and Access Phase.

[0206] In the first phase, network devices broadcast using a standard SSB with a wide coverage area. Through continuous broadcasting of the wide-beam SSB, terminal devices can complete initial cell search and synchronization establishment in any direction without needing any prior cell or beam information. After detecting the standard SSB, the terminal device performs time and frequency synchronization based on the standard SSB and acquires basic cell-related information, thus establishing a preliminary understanding of the network's presence. Based on this, the terminal device can execute subsequent random access and connection establishment procedures according to the coarse-grained directional information indicated by the standard SSB, achieving precise, fine-grained access with the network devices.

[0207] By retaining the traditional wide-beam SSB design in the first phase, disruption to the existing access mechanism was reduced, providing a stable and reliable access foundation for the energy-saving optimization mechanisms introduced in subsequent phases.

[0208] The specific implementation process of the first stage can be found in the description of stage 1 in S201-S210, and will not be repeated here.

[0209] The second stage is the pre-configuration stage of the connected state.

[0210] After the terminal device completes the initial access and establishes a wireless connection, the terminal device enters the connected operation phase.

[0211] The connected state is not only the data transmission phase, but also a crucial phase for preparing the terminal device for beam management and maintenance when it enters the idle state.

[0212] In the second phase, while maintaining basic communication capabilities in the connected state, the network device reconstructs the function and transmission mode of the SSB, and sends all the pre-configuration parameters required for the idle state to the terminal device before the terminal device releases the connection, thereby establishing a continuous and controllable configuration relationship between the connected state and the idle state.

[0213] While the terminal device is in the connected state, the network device no longer treats this phase solely as a data transmission phase, but rather as a critical configuration window before entering the idle state. The network device configures a simplified first SSB, which primarily performs synchronization and beam direction reference functions, and sends the pre-configuration parameters required for the idle state to the terminal device via an RRCrelease message.

[0214] The pre-configured parameters include at least one or more of the following: reference signal, at least one threshold value, and uplink resources, thereby providing a clear basis for the terminal device to perform low-power, high-precision beam management during idle state.

[0215] 2.1 Pre-configured reference signal in connected state

[0216] The reference signal may include a set of CSI-RS resources used for idle-state channel measurements.

[0217] Optionally, the network device may carry one or more of the following pre-configured parameters while configuring the reference signal: long-period SSB configuration parameters, idle state measurement period, time-domain configuration parameters, or frequency-domain configuration parameters.

[0218] 2.2 In connected state, at least one threshold value is pre-configured.

[0219] At least one threshold value in the pre-configured parameters may include one or more of the following: a first threshold value, a second threshold value, or a third threshold value.

[0220] 2.3 Pre-configuring uplink resources in connected state

[0221] Network devices can carry one or more of the following pre-configured parameters when configuring uplink resources, including: parameters for indicating time-frequency location, MCS, DMRS sequence or timer, etc.

[0222] It should be noted that at least one pre-configuration parameter described in the second stage can be carried in the same RRCrelease message or in different messages. This application embodiment does not limit this.

[0223] The third stage is the idle state maintenance stage.

[0224] After the terminal device enters the idle state, it performs idle state operation and maintenance operations, including beam management operations, based on the pre-configured parameters received in the second phase.

[0225] Specifically, the terminal device can wake up from a low-power state according to a pre-configured idle-state measurement cycle (see description in 3.1 below). It uses a long-cycle first SSB to acquire necessary time-frequency synchronization information and measures one or more pre-configured CSI-RS resource sets, instead of blindly scanning all possible standard SSBs (see description in 3.2 below). The terminal device performs beam quality assessment based on the measurement results and pre-configured trigger conditions (see description in 3.3 below); it only initiates a report or connection recovery request to the network device when the trigger conditions are detected (see description in 3.4 below). This enables the terminal device to have an abnormal fallback mechanism, allowing it to re-establish a connection under any circumstances (see description in 3.5 below).

[0226] 3.1 Low-power wake-up in idle state

[0227] After entering the idle state, the terminal operates in a low-power mode. In low-power mode, the terminal device disables all RF and baseband processing modules except for timed wake-up, power management, and minimum synchronization detection functions to minimize static power consumption. The terminal device periodically wakes up according to the idle state measurement cycle pre-configured in the second stage. The idle state measurement cycle is used to uniformly constrain the active frequency of the terminal device during the idle state.

[0228] Unlike the frequent measurements in standard SSB scenarios, this application embodiment extends the idle-state measurement cycle and strictly limits the wake-up time, ensuring that the terminal device is active only within a necessary time window during an idle-state measurement cycle. After completing the predetermined measurement task (such as channel measurement based on CSI-RS resource set), the terminal device immediately re-enters a low-power sleep state, thereby avoiding the additional energy consumption caused by keeping the RF link on for a long time.

[0229] 3.2 Synchronization based on the first SSB and measurement based on the CSI-RS resource set

[0230] During each idle-state measurement cycle, the terminal device receives the first SSB transmitted by the network device after waking up, which is used to restore time and frequency synchronization. The first SSB has a significantly longer transmission period than the standard SSB. Its design purpose is not to support high-frequency cell search or beam scanning, but to provide a low-frequency, stable synchronization anchor point for the idle-state terminal device.

[0231] After synchronization is complete, the terminal device enters the CSI-RS measurement window according to the pre-configured timing relationship. Within the CSI-RS measurement window, the terminal only receives and processes the CSI-RS resource set pre-configured in the second stage, without performing detection operations on other SSBs, reference signals, or unknown beam directions. By decoupling the synchronization function from the measurement function, with the synchronization function handled by the first SSB and the measurement function handled by the CSI-RS resource set, this embodiment of the application avoids the high energy consumption problem caused by using a standard SSB to simultaneously handle synchronization and beam measurement.

[0232] 3.3 Beam Quality Assessment

[0233] After completing the measurement of the CSI-RS resource set, the terminal device performs a unified evaluation of the beam signal quality corresponding to each CSI-RS resource set. This evaluation includes not only determining whether the signal quality of the serving beam meets basic communication requirements, but also analyzing the changing trends of the signal quality of non-serving beams (such as neighboring beams) relative to the serving beam. This enables the terminal device to continuously perceive the stability of the current beam environment during idle periods.

[0234] During trigger determination, the terminal device executes the judgment logic based on at least one threshold value pre-configured in the second stage. The terminal device can determine that the trigger condition is valid when it is continuously met within multiple consecutive measurement cycles. In this way, by comprehensively judging multiple threshold values, frequent triggering and invalid reporting caused by transient fading or short-term occlusion can be effectively avoided.

[0235] 3.4 Idle State Reporting, Network Response and Beam Adjustment

[0236] When the terminal device determines that the triggering condition is met, it no longer executes the traditional random access procedure, but instead directly uses the uplink resources pre-configured in the second phase to send uplink information to the network device. The uplink information includes at least the terminal device's identification information (such as the DMRS sequence), the triggering reason, and the measurement results related to the triggering condition, so that the network device can accurately understand the current wireless environment status of the terminal device.

[0237] After receiving the reported information, the network device executes corresponding beam management decisions based on the measurement results provided by the terminal device. Beam management decisions may include, but are not limited to: maintaining the current serving beam, switching to a non-serving beam with better signal quality, or triggering the terminal device to resume connection. This allows the network device to effectively manage the beam status of idle terminals without maintaining a continuous connection.

[0238] 3.5 Abnormal rollback mechanism

[0239] After the network device completes its response, the terminal device can decide whether to continue operating in the idle state or enter the connected state based on the network device's instructions and its own service needs. If the terminal device is not instructed to restore the connection and the current beam signal quality does not meet the triggering conditions, the terminal device can continue to perform the idle state operation and maintenance phase according to the idle state measurement cycle (see the description in 3.1-3.4).

[0240] If the terminal device fails to detect the pre-configured CSI-RS resource set during idle state, or if the pre-configured parameters become invalid (such as pre-configured parameter timeout), preventing the continuation of steps 3.1-3.4 above, the terminal device will automatically terminate the operation and maintenance phase based on the CSI-RS resource set and the first SSB, and revert to the measurement and access method based on the standard SSB. Through this fallback mechanism, this embodiment of the application can achieve energy-saving operation and maintenance while ensuring that the terminal device has the ability to re-establish a connection under any circumstances.

[0241] Based on the description in the third phase, the embodiments of this application can strictly decouple and constrain synchronization, measurement, and triggering behaviors during idle state, enabling the terminal device to perform limited measurement operations only within the necessary time window, thereby significantly reducing terminal power consumption. Simultaneously, the network device also avoids continuously broadcasting a large number of SSBs or performing invalid beam scans when there is no terminal demand. Thus, an idle state beam management scheme that balances energy efficiency, reliability, and feasibility is achieved in high-frequency, multi-beam communication systems.

[0242] Through the above three-stage description, this application embodiment, without disrupting the existing access mechanism and basic synchronization framework, evolves the idle-state beam management method that relies on the broadcast standard SSB into an energy-saving management method that combines connected-state pre-configuration with precise measurement of idle-state CSI-RS resource sets. This achieves bidirectional energy saving for network devices and terminal devices, and provides a scalable and feasible technical solution for idle-state operation and maintenance in high-frequency, multi-beam communication systems.

[0243] The following example illustrates the communication method using a terminal device (such as a smartphone) that supports millimeter-wave communication. This example does not constitute a limitation on the embodiments of this application. For instance, the terminal device's communication system operates in the 28 GHz frequency band, with a system bandwidth of 400 MHz and a subcarrier spacing of 120 kHz. The network device is a base station that supports multi-beam transmission, maintaining a serving beam and multiple neighboring beams for the terminal device. The serving beam is identified by Beam ID = 3, and the non-serving beams are identified by Beam IDs = 5, 7, and 9, respectively.

[0244] like Figure 4 As shown, the disconnected state can include the idle state, and the communication method can also include the following steps:

[0245] S403. When the terminal device is in a connected state, the network device sends the first SSB to the terminal device.

[0246] The first SSB includes: PSS, SSS, and beam identifier. The beam identifier is used to identify the beam associated with the first SSB.

[0247] The network device sets the transmission period of the first SSB to 160ms.

[0248] Understandably, network devices can periodically send the first SSB to the terminal device.

[0249] S402. When the terminal device is in an idle state, the terminal device performs time and frequency synchronization based on the first SSB.

[0250] S403. The terminal device sends an RRCrelease message to the network device.

[0251] The RRCrelease message may carry pre-configured parameters, including one or more of the following: reference signal, at least one threshold value, and uplink resources.

[0252] The reference signal may include a CSI-RS resource set, which includes a first CSI-RS resource set corresponding to the serving beam and a second CSI-RS resource set corresponding to at least one non-serving beam, as described in S301, and will not be repeated here.

[0253] While transmitting the reference signal, one or more of the following pre-configured parameters may also be carried: long-period SSB configuration parameters (including SSB transmission period), idle state measurement period, and time-domain configuration parameters (including CSI-RS transmission period and CSI-RS measurement period).

[0254] At least one threshold value may include: a first threshold value, a second threshold value, or a third threshold value.

[0255] The following examples illustrate the key parameters in the pre-configured parameters, using Table 3 as an example.

[0256] Table 3. Schematic diagram of pre-configured parameters

[0257]

[0258] S404, The terminal device receives and stores the pre-configured parameters.

[0259] S405. When the terminal device is in an idle state, the network device sends the first SSB to the terminal device.

[0260] The meaning of the first SSB can be found in the description in S401, and will not be repeated here.

[0261] Adaptably, after the terminal device enters the idle state, it can be periodically woken up according to the idle state measurement cycle in the pre-configured parameters, and the terminal device can be indicated to be in a low-power operation mode.

[0262] S406. The terminal equipment synchronizes time and frequency based on the first SSB.

[0263] Understandably, the terminal device can prioritize receiving the first SSB transmitted on the serving beam and complete time and frequency synchronization based on the first SSB within approximately 1 ms. The terminal device can then continue to receive the first SSB transmitted on non-serving beams.

[0264] S407. In the CSI-RS measurement window, the terminal device performs channel measurements based on the CSI-RS resource set and obtains the measurement results.

[0265] For example, the measurement results based on the CSI-RS resource set within a measurement period can be shown in Table 4 below.

[0266] Table 4. Schematic diagram of channel measurement results for serving beam and non-serving beam.

[0267]

[0268] Understandably, the terminal device enters the pre-configured CSI-RS measurement window, receives and measures the pre-configured CSI-RS resource set in the connected state, without performing blind scanning on other SSBs or unconfigured beam directions. Within the CSI-RS measurement window, the terminal device performs channel measurements on the CSI-RS resource set corresponding to the serving beam and the CSI-RS resource set corresponding to the non-serving beam, and caches the measurement results for subsequent judgment.

[0269] S408. When the measurement result is detected to meet the triggering conditions, the terminal device sends measurement reporting information to the network device based on uplink resources.

[0270] Taking a first threshold value of -95dBm, a second threshold value of 3dB, and a third threshold value of 160ms as an example, the measurement result is detected if it meets at least one of the following triggering conditions: the RSRP of the serving beam (e.g., beam ID 3) is less than -95dBm; the duration of the serving beam's RSRP being less than -95dBm is greater than 160ms; the difference between the RSRP of the serving beam and the RSRP of the non-serving beam (e.g., beam ID 5 or 7) is greater than 3dB; or the duration of the difference being greater than 3dB is greater than 160ms.

[0271] The measurement reporting information includes: the identification information of the terminal device (such as the DMRS sequence), the triggering reason, and the measurement results related to the triggering conditions (i.e., the quality of the beam).

[0272] When the triggering cause is poor serving beam quality, the measurement results related to the triggering conditions can be: the RSRP of the serving beam is less than -95 dBm and / or the duration of the RSRP of the serving beam being less than -95 dBm is greater than 80 ms. When the triggering cause is a large difference in signal quality between the serving beam and the non-serving beam, the measurement results related to the triggering conditions can be: the difference between the RSRP of the serving beam and the RSRP of the non-serving beam (such as beam ID 5 or 7) is greater than 3 dB, and / or the duration of the difference being greater than 3 dB is greater than 80 ms.

[0273] For example, when the measurement result is detected to meet the triggering condition, the terminal device does not need to re-establish the connection. Instead, it reports the measurement result to the network device based on the uplink resources, so that the network device can obtain the idle beam quality change without frequently waking up the terminal.

[0274] S409. Network devices determine response strategies based on measurement and reporting information.

[0275] When a network device receives measurement reporting information from a terminal, it parses and evaluates the information and determines whether to select the beam with the best signal quality from the non-serving beams as the new serving beam.

[0276] Based on the measurement and reporting information, it can be seen that the network device determines that the signal quality of Beam ID=5 is better than the current serving beam. Therefore, the network device can record Beam ID=5 and determine it as the preferred beam for subsequent connection restoration.

[0277] If the network device does not trigger connection recovery, the terminal device can continue to operate in an idle state and repeat the operation and maintenance process in 3.1-3.4 according to the established measurement cycle.

[0278] If the terminal fails to detect the pre-configured CSI-RS resource set within multiple consecutive idle state measurement cycles, the terminal device will automatically fall back to the channel measurement and access method based on the standard SSB to ensure the reliability of the communication system.

[0279] It should be noted that the communication method provided in this application embodiment can also be adapted to the following various scenarios. The following scenarios are only examples and do not constitute a limitation on the embodiments of this application.

[0280] Scenario 1: Large sports stadiums and high-density indoor areas

[0281] Scenario Overview: In large stadiums, convention centers, or major transportation hubs (such as high-speed rail stations), the user density per unit area is extremely high. These scenarios exhibit strong spatiotemporal focus and group consistency, meaning that thousands of users gather within a specific timeframe (e.g., spectators in the stands), and their movement trajectories and geographical distribution are relatively fixed. During non-business activities (e.g., breaks in matches, waiting for trains), a massive number of mobile terminal devices are idle. Typically, base stations can be deployed at high density within the venue using small cells and continuously broadcast standard SSBs, resulting in an extremely complex indoor wireless environment.

[0282] like Figure 5 As shown, in Scenario 1, this embodiment of the application achieves terminal operation and maintenance in idle state through the use of multicast CSI-RS resource sets and the first SSB. Specifically, the base station can pre-divide thousands of geographically close idle terminal devices into specific groups based on the physical partitions of the grandstand sectors or waiting halls, and use RRRCRelease messages to send a unified multicast resource configuration (such as a CSI-RS resource set). The base station significantly extends the period of the standard SSB in the venue and removes the PBCH, retaining only the necessary synchronization pulse and beam ID to form the first SSB. Subsequently, the base station only transmits narrow-beam CSI-RS resource sets for specific areas within a preset multicast window, enabling all terminal devices in that area to complete accurate beam quality assessment based on the same CSI-RS resource set.

[0283] Based on this, the solution addresses the spectrum resource efficiency bottleneck and severe self-interference issues caused by dense base station deployment in high-density scenarios, and purifies the indoor electromagnetic environment by removing redundant PBCH information. It effectively alleviates conflicts in physical resource management and avoids PRB resource depletion caused by configuring dedicated measurement signals for a massive number of idle terminal devices. Simultaneously, the solution also resolves physical random access channel congestion caused by a large number of terminal devices simultaneously attempting random access during periods of service disruption, ensuring an orderly and efficient access process through a pre-configured conflict resolution algorithm.

[0284] The communication method provided in this application reduces the normal broadcast power consumption of large venue base stations by approximately 15%-25%, significantly improving the green energy efficiency of venue operations. On the terminal side, due to the implementation of "one downlink transmission, precise measurement of the entire group," the power consumption of terminal devices during invalid scanning is reduced by more than 70%, greatly alleviating the problem of rapid battery drain for users' mobile phones during large events. More importantly, the orthogonal DMRS sequence design based on group identifiers increases the idle-state connection density supported by the venue system by 3-5 times, ensuring "instantaneous wake-up" and stable reconnection of communication services in extremely dense environments.

[0285] Scenario 2: Intelligent Transportation and Autonomous Driving (V2X)

[0286] In future intelligent transportation systems, vehicles and roadside units (RSUs) will primarily establish narrow-beam connections via extremely high frequency bands (such as millimeter waves or terahertz) to support ultra-reliable and low-latency communications (URLLC). In typical urban traffic environments, when vehicles are stopped at traffic lights, cruising slowly in parking lots, or in traffic congestion, their onboard communication modules typically switch to an idle state to save power. However, due to the strong directionality and susceptibility to blockage of high-frequency signals, even in the idle state, vehicles must maintain high-precision beam alignment with the RSU in real time to ensure instantaneous reception of traffic emergencies or safety warnings from the roadside.

[0287] like Figure 5 As shown, in Scenario 2, this embodiment effectively supports efficient operation and maintenance in a V2X environment through the concepts of "synchronization and measurement decoupling" and "cross-state pre-configuration" mechanism. The RSU, acting as a network anchor point, periodically sends a long-cycle first SSB to maintain basic time-frequency calibration. Simultaneously, the base station or RSU divides vehicles into different groups based on their travel path, real-time speed, and spatial orientation, and pre-deploys multicast CSI-RS resource configurations based on groupID via RRCrelease messages. These configurations include resource information for the serving beam and potential neighbor beams. Idle vehicle terminal equipment only measures the multicast CSI-RS resource set within a preset measurement window and maintains a dynamic logical association with network devices based on uplink resources in the pre-configured parameters.

[0288] Based on this, the problem of sudden interruption of non-line-of-sight (NLoS) links caused by the movement of large vehicles (such as buses and trucks) or buildings obstructing the view of high-frequency narrow beams in complex and dynamic urban environments is solved. In traditional solutions, beam loss means that the terminal device must re-perform a complex full-beam scan and a four-step random access procedure, which will generate a delay of tens of milliseconds, failing to meet the real-time requirements of autonomous driving for safety signaling. The embodiments of this application utilize the fast recovery mechanism of the random access channel (RACH) to solve the problem of high reconnection latency caused by beam failure during movement of idle terminal devices, ensuring deterministic latency in reporting safety warning information.

[0289] The communication method provided in this application significantly shortens the RF chain activation time of the vehicle communication module in idle state, reduces overall power consumption by more than 70%, and extends the energy efficiency cycle of the electric vehicle communication system. In extreme scenarios with obstruction, the vehicle can seamlessly switch from the failed beam to the backup reflected beam within 5ms using a reserved fast channel. This millisecond-level response capability not only greatly improves the communication robustness of autonomous driving services in dynamic and complex scenarios, but also provides a standardized technical path for optimizing the spectrum efficiency of V2X networks under ultra-high connection density.

[0290] It should be noted that the module names involved in the embodiments of this application can all be defined as other names, as long as they can achieve the function of each module, and no specific restrictions are placed on the module names.

[0291] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in the embodiments of this application are all information and data authorized by the user or fully authorized by all parties. Furthermore, the collection, use and processing of related data must comply with the relevant laws, regulations and standards of the relevant countries and regions, and corresponding operation entry points are provided for users to choose to authorize or refuse.

[0292] The communication method of the embodiments of this application has been described above. The apparatus for executing the above method provided in the embodiments of this application is described below. Those skilled in the art will understand that the methods and apparatus can be combined and referenced with each other, and the related apparatus provided in the embodiments of this application can execute the steps in the above list sorting method.

[0293] This application provides a communication device, which can be an electronic device, or a chip or chip system within an electronic device. The communication device may include a display unit and a processing unit. When the communication device is an electronic device, the display unit may be a display screen. The display unit is used to perform display steps to enable the electronic device to implement a communication method described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. When the communication device is an electronic device, the processing unit may be a processor. The communication device may also include a storage unit, which may be a memory. The storage unit is used to store instructions, and the processing unit executes the instructions stored in the storage unit to enable the electronic device to implement a communication method described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. When the communication device is a chip or chip system within an electronic device, the processing unit may be a processor. The processing unit executes the instructions stored in the storage unit to enable the electronic device to implement a communication method described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. The storage unit can be a storage unit inside the chip (e.g., a register, cache, etc.) or a storage unit located outside the chip within the electronic device (e.g., a read-only memory, random access memory, etc.).

[0294] This application provides a chip or chip system including at least one processor and a communication interface. The communication interface and the at least one processor are interconnected via a circuit. The at least one processor is used to run computer programs or instructions to perform the methods described in the first aspect, any possible implementation of the first aspect, the second aspect, or any possible implementation of the second aspect. The communication interface in the chip can be an input / output interface, pins, or circuits, etc.

[0295] In one possible implementation, the chip or chip system described above in this application further includes at least one memory storing instructions. The memory can be an internal storage unit of the chip, such as a register or cache, or it can be a storage unit of the chip itself (e.g., read-only memory, random access memory, etc.).

[0296] The communication method provided in this application can be applied to electronic devices with communication functions. Electronic devices include terminal devices, and the specific device form of the terminal device can be referred to the above-described related descriptions, which will not be repeated here.

[0297] This application provides an electronic device, including: a processor and a memory; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory, causing the electronic device to perform the above-described method.

[0298] This application provides a chip. The chip includes a processor, which is used to call a computer program in memory to execute the technical solutions in the above embodiments. Its implementation principle and technical effects are similar to those in the related embodiments described above, and will not be repeated here.

[0299] This application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program. When the computer program is executed by a processor, it implements the methods described above. The methods described in the above embodiments can be implemented wholly or partially by software, hardware, firmware, or any combination thereof. If implemented in software, the functionality can be stored as one or more instructions or code on or transmitted over the computer-readable medium. The computer-readable medium can include computer storage media and communication media, and can also include any medium that can transfer a computer program from one place to another. The storage medium can be any target medium accessible by a computer.

[0300] In one possible implementation, a computer-readable medium may include RAM, ROM, compact disc read-only memory (CD-ROM) or other optical disc storage, disk storage or other magnetic storage devices, or any other medium targeted to carry or to store the required program code in the form of instructions or data structures, and accessible by a computer. Furthermore, any connection is appropriately referred to as a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. As used herein, disks and optical discs include laser discs, Digital Versatile Discs (DVDs), floppy disks, and Blu-ray discs, where disks typically reproduce data magnetically, while optical discs optically reproduce data using lasers. Combinations of the above should also be included within the scope of computer-readable media.

[0301] This application provides a computer program product, which includes a computer program that, when run, causes a computer to perform the above-described method.

[0302] This application describes embodiments with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processing unit of a general-purpose computer, special-purpose computer, embedded processor, or other programmable device to produce a machine, such that the instructions, which execute via the processing unit of the computer or other programmable data processing device, generate instructions for implementing the flowchart. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0303] The above detailed embodiments further illustrate the purpose, technical solution, and beneficial effects of the embodiments of this application. It should be understood that the above are merely specific embodiments of the embodiments of this application and are not intended to limit the protection scope of the embodiments of this application. Any modifications, equivalent substitutions, improvements, etc., made on the basis of the technical solutions of the embodiments of this application should be included within the protection scope of the embodiments of this application.

Claims

1. A communication method, characterized in that, The method includes: When the terminal device is in a connected state, it receives pre-configured parameters via connection release signaling. These pre-configured parameters include a reference signal, first information, and second information. The reference signal includes a channel state information reference signal resource set, which corresponds to N beams, including serving beams and non-serving beams. The number of beams between the terminal device and the network device is M, where N is less than M, and both N and M are positive integers. The first information indicates uplink resources used for data reporting when the terminal device is in a disconnected state and triggering conditions are met. The second information indicates one or more of the following: a first threshold value for measuring the reference signal received power (RSRP) of the serving beam, a second threshold value for measuring signal fluctuations between the serving beam and the non-serving beam, or a third threshold value, where the third threshold value is the measurement duration. When the terminal device is in a disconnected state, it receives a first synchronization signal block, which includes a primary synchronization signal PSS, a secondary synchronization signal SSS, and a beam identifier. The beam identifier is used to identify the beam associated with the first synchronization signal block. The first synchronization signal block does not contain a physical broadcast channel PBCH. Time and frequency synchronization are performed based on the first synchronization signal block, and channel measurement is performed based on the reference signal.

2. The method according to claim 1, characterized in that, The method further includes: If the triggering condition is detected, third information is sent based on the uplink resources.

3. The method according to claim 2, characterized in that, The triggering conditions include one or more of the following: the RSRP of the serving beam is less than the first threshold value; the difference between the RSRP of the serving beam and the RSRP of the non-serving beam is greater than the second threshold value; or the duration for which the RSRP of the serving beam is less than the first threshold value is greater than the third threshold value; or the duration for which the difference is greater than the second threshold value is greater than the third threshold value.

4. A communication method applied to a network device, characterized in that, The method includes: When the terminal device is in a connected state, pre-configuration parameters are sent to the terminal device. These pre-configuration parameters include a reference signal, first information, and second information. The reference signal is a channel state information reference signal resource set, used for channel measurement when the terminal device switches from the connected state to the disconnected state. The channel state information reference signal resource set corresponds to N beams, including serving beams and non-serving beams. There are M beams between the terminal device and the network device, where N is less than M, and both N and M are positive integers. The first information indicates uplink resources, used for data reporting when the terminal device is in the disconnected state and trigger conditions are met. The second information indicates one or more of the following: a first threshold value for measuring the reference signal received power (RSRP) of the serving beam, a second threshold value for measuring signal fluctuations between the serving beam and the non-serving beam, or a third threshold value, where the third threshold value is the measurement duration. When the terminal device is in a disconnected state, a first synchronization signal block is sent to the terminal device. The first synchronization signal block includes: PSS, SSS and beam identifier. The beam identifier is used to identify the beam associated with the first synchronization signal block. The first synchronization signal block does not contain the physical broadcast channel PBCH.

5. The method according to claim 4, characterized in that, The method further includes: Receive third information, which is received when the triggering condition is met.

6. The method according to claim 5, characterized in that, The triggering conditions include one or more of the following: the RSRP of the serving beam is less than the first threshold value; the difference between the RSRP of the serving beam and the RSRP of the non-serving beam is greater than the second threshold value; or the duration for which the RSRP of the serving beam is less than the first threshold value is greater than the third threshold value; or the duration for which the difference is greater than the second threshold value is greater than the third threshold value.

7. A communication system, characterized in that, include: A network device and a terminal device, wherein the terminal device is configured to perform the method as described in any one of claims 1-3, and the network device is configured to perform the method as described in any one of claims 4-6.

8. An electronic device, characterized in that, include: Processor and memory; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory, causing the terminal device to perform the method as described in any one of claims 1-3, or to perform the method as described in any one of claims 4-6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-3, or performs the method as described in any one of claims 4-6.

10. A chip system, characterized in that, It includes at least one processor and a communication interface, the communication interface and the at least one processor being interconnected via a line, the at least one processor being configured to run a computer program or instructions to perform the method as described in any one of claims 1-3, or to perform the method as described in any one of claims 4-6.

11. A computer program product, characterized in that, Includes a computer program that, when run, causes a computer to perform the method as described in any one of claims 1-3, or to perform the method as described in any one of claims 4-6.

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