Information transmission method, terminal device, first network device, and second network device

Abstract

The present application relates to an information transmission method, a terminal device, a first network device, a second network device, a chip, a computer-readable storage medium, a computer program product, a computer program, and a communication system. The method comprises: a terminal device sending first information to a network device of a first cell, the first information being used by the network device of the first cell to determine to send second information to a network device of a second cell, and the second information being used for triggering the network device of the second cell to send a discovery signal. Embodiments of the present application can improve a network energy saving effect.

Description

Information transmission method, terminal equipment, first network equipment and second network equipment Technical Field

[0001] This application relates to the field of communications, and more specifically, to an information transmission method, a terminal device, a first network device, a second network device, a chip, a computer-readable storage medium, a computer program product, a computer program, and a communication system. Background Technology

[0002] Network energy saving (NES) is crucial for environmental sustainability, reducing environmental impact (greenhouse gas emissions), and saving operating costs. With the proliferation of 5G systems across industries and geographic regions, it is handling more advanced services and applications requiring extremely high data rates, leading to denser networks using more antennas, wider bandwidths, and more frequency bands. The environmental impact of 5G needs to be controlled, necessitating the development of new solutions to improve network energy efficiency.

[0003] Summary of the Invention

[0004] This application provides an information transmission method that can improve network energy efficiency.

[0005] This application provides an information transmission method, including:

[0006] The terminal device sends first information to the network device of the first cell; wherein, the first information is used by the network device of the first cell to determine to send second information to the network device of the second cell, and the second information is used to trigger the network device of the second cell to send a discovery signal.

[0007] This application provides an information transmission method, including:

[0008] In response to the first information from the terminal device, the network device of the first cell sends the second information to the network device of the second cell; wherein the second information is used to trigger the network device of the second cell to send a discovery signal.

[0009] This application provides an information transmission method, including:

[0010] In response to the second information from the network device in the first cell, the network device in the second cell sends a discovery signal; wherein the discovery signal is used by the terminal device to perform cell measurements.

[0011] This application provides a terminal device, including:

[0012] The first communication module is used to send first information to the network device of the first cell; wherein, the first information is used by the network device of the first cell to determine to send second information to the network device of the second cell, and the second information is used to trigger the network device of the second cell to send a discovery signal.

[0013] This application provides a first network device, which is a network device for a first cell. The first network device includes:

[0014] The second communication module is used to send second information to the network device of the second cell in response to the first information from the terminal device; wherein the second information is used to trigger the network device of the second cell to send a discovery signal.

[0015] This application provides a second network device, which is a network device for a second cell. The second network device includes:

[0016] The third communication module is used to send a discovery signal in response to the second information from the network device of the first cell; wherein the discovery signal is used by the terminal device to perform cell measurement.

[0017] This application provides a terminal device, including a transceiver, a processor, and a memory. The memory stores a computer program, the transceiver communicates with other devices, and the processor calls and runs the computer program stored in the memory to enable the terminal device to perform the aforementioned information transmission method.

[0018] This application provides a first network device, including a transceiver, a processor, and a memory. The memory stores a computer program, the transceiver communicates with other devices, and the processor calls and runs the computer program stored in the memory to enable the first network device to perform the aforementioned information transmission method.

[0019] This application provides a second network device, including a transceiver, a processor, and a memory. The memory stores a computer program, the transceiver communicates with other devices, and the processor calls and runs the computer program stored in the memory to enable the second network device to perform the aforementioned information transmission method.

[0020] This application provides a chip for implementing the above-described information transmission method.

[0021] Specifically, the chip includes a processor for retrieving and running a computer program from memory, causing a device equipped with the chip to perform the aforementioned information transmission method.

[0022] This application provides a computer-readable storage medium for storing a computer program, which, when run by a device, causes the device to perform the aforementioned information transmission method.

[0023] This application provides a computer program product, including computer program instructions that cause a computer to execute the above-described information transmission method.

[0024] This application provides a computer program that, when run on a computer, causes the computer to perform the information transmission method described above.

[0025] This application provides a communication system including a terminal device, a first network device, and a second network device; wherein the terminal device is used to execute the above-described information transmission method; the first network device includes a network device of a first cell used to execute the above-described information transmission method; and the second network device includes a network device of a second cell used to execute the above-described information transmission method.

[0026] In this embodiment, the terminal device sends first information to the network device of the first cell, which triggers the network device of the first cell to send second information to the network device of the second cell, thereby triggering the network device of the second cell to send a discovery signal. Therefore, the network device of the second cell can reduce the sending of discovery signals and only send discovery signals when the terminal device needs them, thereby improving the network energy saving effect. Attached Figure Description

[0027] Figure 1 is a schematic diagram of a communication system according to an embodiment of this application.

[0028] Figure 2 is a schematic diagram illustrating an example of SMTC usage.

[0029] Figure 3 is a schematic diagram of the low mobility criterion.

[0030] Figure 4 is a schematic flowchart of an information transmission method according to an embodiment of this application.

[0031] Figure 5 is a schematic flowchart of an information transmission method according to another embodiment of this application.

[0032] Figure 6 is a schematic diagram of an application example of the information transmission method according to an embodiment of this application.

[0033] Figure 7 is a schematic diagram of the resources of the channel or signal carrying the first information in the information transmission method of this application embodiment.

[0034] Figure 8 is a schematic diagram of another application example of the information transmission method according to an embodiment of this application.

[0035] Figure 9 is a schematic diagram of another application example of the information transmission method according to an embodiment of this application.

[0036] Figure 10 is a schematic flowchart of an information transmission method according to another embodiment of this application.

[0037] Figure 11 is a schematic block diagram of a terminal device according to an embodiment of the present application.

[0038] Figure 12 is a schematic block diagram of a first network device according to an embodiment of the present application.

[0039] Figure 13 is a schematic block diagram of a first network device according to another embodiment of this application.

[0040] Figure 14 is a schematic block diagram of a second network device according to an embodiment of the present application.

[0041] Figure 15 is a schematic block diagram of a communication device according to an embodiment of this application.

[0042] Figure 16 is a schematic block diagram of a chip according to an embodiment of this application.

[0043] Figure 17 is a schematic block diagram of a communication system according to an embodiment of this application. Detailed Implementation

[0044] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0045] The technical solutions of this application embodiment can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, Advanced Long Term Evolution (LTE-A) systems, New Radio (NR) systems, evolution systems of NR systems, LTE-based access to unlicensed spectrum (LTE-U) systems, NR-based access to unlicensed spectrum (NR-U) systems, Non-Terrestrial Networks (NTN) systems, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), 5G, 6th-Generation (6G) systems, or other communication systems.

[0046] Traditional communication systems typically support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communication but also, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication. The embodiments of this application can also be applied to these communication systems.

[0047] In one implementation, the communication system in this application embodiment can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, or a standalone (SA) network deployment scenario.

[0048] In one embodiment, the communication system in this application can be applied to unlicensed spectrum, wherein the unlicensed spectrum can also be considered as shared spectrum; or, the communication system in this application can also be applied to licensed spectrum, wherein the licensed spectrum can also be considered as non-shared spectrum.

[0049] This application describes various embodiments in conjunction with network devices and terminal devices. The terminal device may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device, etc.

[0050] Terminal devices can be stations (STAION, ST) in WLANs, cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistant (PDA) devices, handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in next-generation communication systems such as NR networks, or terminal devices in future evolved Public Land Mobile Network (PLMN) networks, etc.

[0051] In the embodiments of this application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (such as ships); and it can also be deployed in the air (such as airplanes, balloons and satellites).

[0052] In the embodiments of this application, the terminal device may be a mobile phone, a tablet computer, a computer with wireless transceiver capabilities, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical care, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc.

[0053] By way of example and not limitation, in this embodiment, 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. Wearable devices are not merely hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are feature-rich, large in size, and can achieve complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses, as well as those that focus on a specific type of application function and require the use of other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0054] In the embodiments of this application, the network device can be a device for communicating with mobile devices, such as an access point (AP) in a WLAN, an evolved Node B (eNB or eNodeB) in LTE, a relay station or access point, or a vehicle-mounted device, a wearable device, a network device (gNB) in an NR network, or a network device in a future evolved PLMN network or an NTN network, etc.

[0055] By way of example and not limitation, in this embodiment, the network device may have mobility characteristics; for example, the network device may be a mobile device. Optionally, the network device may be a satellite or a balloon station. For example, the satellite may be a low Earth orbit (LEO) satellite, a medium Earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. Optionally, the network device may also be a base station located on land, water, or other similar locations.

[0056] In this embodiment, the network device can provide services to a cell. The terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell can be the cell corresponding to the network device (e.g., a base station). The cell can belong to a macro base station or to a base station corresponding to a small cell. The small cell can include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0057] Figure 1 illustrates an exemplary communication system 100. The communication system includes a network device 110 and two terminal devices 120. In one embodiment, the communication system 100 may include multiple network devices 110, and the coverage area of ​​each network device 110 may include other numbers of terminal devices 120; this embodiment does not limit the scope of the present application.

[0058] It should be understood that devices with communication functions in the network / system of this application embodiment can be referred to as communication devices. Taking the communication system shown in Figure 1 as an example, the communication device may include network devices and terminal devices with communication functions. The network devices and terminal devices can be specific devices in this application embodiment, which will not be described in detail here. The communication device may also include other devices in the communication system, such as network controllers, mobility management entities, and other network entities. This application embodiment does not limit this.

[0059] It should be understood that the terms "system" and "network" are often used interchangeably in this document. The term "and / or" in this document merely describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0060] It should be understood that the term "instruction" mentioned in the embodiments of this application can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0061] In the description of the embodiments of this application, the term "correspondence" may indicate that there is a direct or indirect correspondence between two things, or that there is an association between two things, or that there is a relationship of instruction and being instructed, configuration and being configured, etc.

[0062] To facilitate understanding of the technical solutions of the embodiments of this application, the relevant technologies of the embodiments of this application are described below. The following relevant technologies are optional solutions and can be combined with the technical solutions of the embodiments of this application in any way, and they all fall within the protection scope of the embodiments of this application.

[0063] (I) Network energy-saving technology

[0064] Network energy efficiency is crucial for environmental sustainability, reducing environmental impact (greenhouse gas emissions), and saving operating costs. As 5G becomes more widespread across industries and geographic regions, it is handling more advanced services and applications requiring extremely high data rates, such as Extended Reality (XR). Networks are becoming denser, using more antennas, wider bandwidths, and more frequency bands. The environmental impact of 5G needs to be controlled, necessitating the development of new solutions to improve network energy efficiency.

[0065] Energy consumption has become a key component of operators' operating expenses (OPEX). The majority of energy consumption comes from the wireless access network, particularly the active antenna unit (AAU), with data centers and fiber optic transmission accounting for a smaller share. Wireless access power consumption can be divided into two parts: a dynamic component, consumed only during data transmission / reception; and a static component, consumed continuously even when data transmission / reception is not in progress to maintain the necessary operation of the wireless access equipment.

[0066] Network power-saving technologies include those categorized by time, frequency, spatial, and power domains, and their impact on legacy UEs and specifications. Techniques in the time and frequency domains primarily aim to reduce power consumption in the dynamic portion by attempting to disable more symbols on one or more carriers to achieve base station micro-sleep, or even reduce power consumption in the static portion by increasing the intervals between consecutive active transmission / reception events to achieve base station light / deep sleep. Techniques in the spatial and power domains primarily aim to reduce power consumption in transceiver (TRX) links and PAs by attempting to disable more spatial elements and / or reduce transmit power / power spectral density, or improve power amplifier (PA) efficiency.

[0067] Currently, work projects addressing NR network power saving have introduced protocol-based network power saving technologies. These technologies are primarily used for Radio Resource Control (RRC) connection status, user-specific signals and channels, and low-load scenarios. These technologies include:

[0068] Operations for cross-band carrier aggregation (CA) and secondary cell (SCell) without synchronization signal block (SPB) in co-located cells for FR1;

[0069] This includes enhancements to the cell DTX / DRX mechanism, which aligns cell discontinuous transmission (DTX) / discontinuous reception (DRX) with UE DRX in RRC_CONNECTED mode.

[0070] Information exchange between nodes of the community's DTX / DRX;

[0071] Techniques in the spatial and power domains to achieve efficient adaptation of spatial elements and efficient adaptation of power offset values ​​between the Physical Downlink Shared Channel (PDSCH) and the Channel State Information-Reference Signal (CSI-RS);

[0072] Mechanism to prevent traditional UEs from camping in cells using Rel-18 NES technology;

[0073] Enhanced connection establishment optimization (CHO) procedure;

[0074] Inter-node beam activation and enhanced paging capabilities confined to limited areas;

[0075] The corresponding core requirements for Radio Resource Management (RRM) / Radio Frequency (RF).

[0076] These technologies aim to improve the energy efficiency of 5G networks, particularly under connected and low-load conditions, by optimizing signal and channel usage, improving cell energy management, and reducing unnecessary energy consumption. Through these measures, operators can reduce operating costs while minimizing their environmental impact.

[0077] Further enhancements to network energy-saving technologies may include:

[0078] For UEs configured with carrier aggregation, the process and signaling method for activating the synchronization signal block of the auxiliary carrier on-demand in connected mode;

[0079] Define triggering methods, including sending wake-up signals via the UE's existing uplink signals / channels, via the returned cell on / off indication, or SCell activation / deactivation signaling;

[0080] On-demand SSB can be used for SCell time / frequency synchronization, L1 / L3 measurement, and SCell activation;

[0081] For UEs in idle or inactive mode, the on-demand process and signaling method for receiving System Information Block 1 (SIB1) includes the triggering method of uplink wake-up signal using existing signals / channels and the provision of wake-up signal configuration to the UE through information exchange between gNBs;

[0082] It supports adaptation for specified common signal / channel transmission, including: adaptation of SSB in the time domain (e.g., adaptive period), adaptation of PRACH (Physical Random Access Channel) in the time domain, adaptation of PRACH in the spatial domain (e.g., non-uniform PRACH resources for each SSB, and specifying them when beneficial), and adaptation for limiting paging timing in the time domain.

[0083] (II) Cell search process of NR system

[0084] The cell search process in the NR system is a crucial step in the UE's process of finding and accessing a suitable serving cell in the network when it powers on or needs to re-establish a connection. The following is the NR cell search process:

[0085] Frequency tuning: The UE first adjusts to a specific frequency according to the synchronization grid of the specified frequency band, and attempts to detect the synchronization signal block SSB on that frequency grid.

[0086] PSS / SSS Detection: The UE attempts to detect the Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS) in the SSB. These signals have fixed positions in the time-frequency resources of an SSB. By detecting the PSS and SSS, the UE can obtain symbol synchronization and frame synchronization with the base station, and at the same time obtain the Physical Cell Identity (PCI) information.

[0087] PBCH (Physical Broadcast Channel) Decoding: After successful synchronization, the UE attempts to decode the Physical Broadcast Channel (PBCH) using information provided by the PSS and SSS. The PBCH carries the Master Information Block (MIB), which the UE obtains by decoding the PBCH. The MIB contains key parameters needed to decode other system information.

[0088] SIB1 Configuration Acquisition: Based on the Control Resource Set 0 (CORESET0) and Search Space 0 information in the MIB message, determine the relevant configuration of the Physical Downlink Control Channel (PDCCH) of System Information Block Type 1 (SIB1).

[0089] Search space blind detection of downlink control information (DCI): In the search space indicated by MIB, the UE blindly detects the DCI of format 1_0 (DCI 1_0), which is the DCI used for scheduling SIB1.

[0090] Verifying and obtaining DCI 1_0: Once DCI 1_0 is detected, the UE will use the System Information-Radio Network Temporary Identifier (SI-RNTI) to further verify and obtain the specific content of DCI 1_0.

[0091] Detection and decoding of SIB1 messages on the Physical Downlink Shared Channel (PDSCH): Using the information provided in DCI 1_0, the UE is able to find and decode SIB1 messages carried on the Physical Downlink Shared Channel (PDSCH).

[0092] Decoding SIB1 and other SIB messages: SIB1 contains the key parameters needed to decode other System Information Blocks (SIBs). The UE will continue to decode other SIB messages to obtain complete network configuration and access information.

[0093] These steps together form the core of the 5G NR cell search and initial access process. After successfully completing these steps, the UE will be able to access the network and begin normal data transmission and communication.

[0094] (III) Radio Resource Management (RRM) Measurement

[0095] For wireless mobile communication systems, accurate measurement of cell quality and beam quality is fundamental to the effective execution of radio resource management and mobility management. For 5G NR, two main types of reference signals are currently considered as measurement reference signals: SSB and Channel-State Information Reference Signal (CSI-RS).

[0096] SSB Measurement Timing Configuration (SMTC) is the time-domain resource configuration information for SSB measurements and an important new concept introduced in 5G NR measurement configuration. It is primarily used to configure a set of measurement time windows based on SSB measurements, and parameters such as the size, position, and period of these windows can be adjusted through configuration parameters. Figure 2 is a schematic diagram illustrating an example of SMTC usage. As shown in Figure 2, SMTC can be used to configure the SMTC window period, SMTC window size, SSB burst set, SSB transmission period, etc.

[0097] It is important to note that the SMTC is configured separately for each frequency point. When a UE performs measurements, it has one set of SMTCs for each measurement frequency point to indicate the available measurement window information for that frequency point. However, this restriction has been gradually relaxed in protocol discussions. In Release 15, to match the different synchronization signal block periods of different cells, it was allowed to configure two sets of SMTC parameters for a given cell measurement during connected-mode co-frequency measurements. For example, in addition to the basic SMTC configuration, a more dense measurement window could be configured for the serving cell and cells indicated in a specific cell list. In the subsequent Release 16, the maximum number of SMTC configurations on each frequency point was also increased to two for idle-mode measurements to further meet the flexibility of network operation.

[0098] Furthermore, higher-layer signaling can use the ReferenceSignalConfig parameter to indicate specific configuration information for the measurement reference signal. For SSB-based measurements, the SSB-ToMeasure indicator uses a bitmap to indicate the location information of the actually transmitted SSBs in the SSB burst set. The UE can use ssb-ToMeasure to clearly know which SSB candidate locations have actually transmitted SSBs and which have not. In locations where no SSBs have been transmitted, the UE does not need to perform measurements, thus achieving energy saving for the UE.

[0099] For CSI-RS-based measurements, the base station can configure one or more CSI-RS resources for the UE to perform measurements via higher-layer signaling. Firstly, on a cell-by-cell basis, higher-layer signaling can provide cell-level CSI-RS configuration parameters, such as cell ID, cell measurement bandwidth, and resource density. Furthermore, since each cell can be configured with multiple CSI-RS resources, further parameter configuration will provide configuration information at the individual CSI-RS resource level, such as the specific CSI-RS index, the time-domain and frequency-domain location information occupied by the CSI-RS resource, and the sequence generation method.

[0100] In the NR system, UE mobility management mainly includes cell selection and cell reselection processes in RRC idle (RRC_IDLE) or RRC inactive (RRC_INACTIVE) states, as well as the handover process for connected UEs. Specifically, it includes:

[0101] 1. RRC_IDLE or RRC_INACTIVE state mobility management

[0102] For UEs in RRC_IDLE or RRC_INACTIVE states, the prerequisite for camping on a cell is that the cell's signal quality meets the cell selection S criterion. Signal quality includes measurements of Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ). After selecting a suitable cell, the UE will continuously evaluate cell reselection. The measurements performed for cell reselection are divided and performed according to the reselection priority of each frequency point. Specifically:

[0103] For high-priority frequency points, neighbor cell measurements are always performed;

[0104] For co-frequency points, when the RSRP and RSRQ values ​​of the serving cell are both higher than the co-frequency measurement threshold configured by the network, the UE can stop co-frequency neighbor cell measurement; otherwise, measurement must be performed.

[0105] For frequency points of the same and lower priorities, when the RSRP and RSRQ values ​​of the serving cell are both higher than the inter-frequency measurement threshold configured by the network, the UE can stop the neighbor cell measurement of the same and lower priorities frequency points; otherwise, the measurement must be performed.

[0106] After obtaining multiple candidate cells through measurement, the process of determining the target cell for cell reselection is basically the same as in the LTE system, adopting the principle of prioritizing cells on high-priority frequency points for reselection. Specifically:

[0107] For cell reselection on high-priority frequency points, the signal quality must be higher than a certain threshold and last for a specified duration, and the UE must remain in the source cell for no less than 1 second.

[0108] For cell reselection on the same frequency and priority frequency points, the R criterion (ordered according to RSRP) must be met: the signal quality of the new cell is better than that of the current cell and lasts for a specified duration, and the UE camps on the source cell for no less than 1 second.

[0109] For cell reselection on low-priority frequency points, there must be no high-priority or same-priority frequency point cells meeting the requirements, the source cell signal quality must be below a certain threshold, the cell signal quality on the low-priority frequency point must be above a certain threshold and last for a specified duration, and the UE must camp on the source cell for no less than 1 second.

[0110] During cell reselection on the same frequency and priority frequency points, when multiple candidate cells meet the requirements, the LTE system selects the best cell as the target cell using the RSRP (Resource Response Point Ranking) method. Considering that UEs access cells via beams in the NR system, to increase the probability of successful access through a good beam, the target cell selection needs to consider both cell signal quality and the number of good beams. To achieve this, the NR system first selects the best few cells with similar signal quality before choosing the target cell, and then selects the cell with the most good beams as the target cell.

[0111] 2. Connected Mobility Management

[0112] Mobility management of connected UEs is mainly achieved through the handover process controlled by the network. The NR system inherits the handover process of the LTE system, which mainly includes three stages: handover preparation, handover execution, and handover completion.

[0113] During the handover preparation phase, after receiving the measurement report sent by the UE, the source base station will make a handover decision and initiate a handover request to the target base station. If the target cell accepts the request, it will send a handover response message to the source base station through the inter-base station interface. This message contains the configuration information of the target cell, i.e., the handover command.

[0114] During the handover execution phase, the source base station sends a handover command to the UE. Upon receiving the handover command, the UE disconnects from the source cell, begins establishing downlink synchronization with the target cell, and then initiates a random access procedure to the target cell using the random access resources configured in the handover command. Upon completion of the random access procedure, the UE reports a handover completion message. During the UE's access to the target cell, the source base station forwards data packets from the User Plane Function (UPF) to the target base station and sends the uplink and downlink data packet transmission and reception status information from the source cell before forwarding to the target base station.

[0115] During the handover completion phase, the target base station sends a path transition request to the Access and Mobility Management Function (AMF), requesting the AMF to switch the data packet transmission path from the UPF to the access network to the target base station. Once the AMF responds to the request, it indicates that the path transition was successful, and the target base station can instruct the source base station to release the UE's context information. At this point, the UE's connection has been switched to the target cell.

[0116] (iv) Relaxation mechanism of RRM measurement

[0117] Terminals in a disconnected state need to perform RRM measurements on the serving cell and other neighboring cells based on network configuration to support mobility operations, such as cell reselection. In the NR R15 standard, for energy-saving purposes, when the channel quality of the serving cell is good, the terminal may not initiate RRM measurements for co-frequency points or inter-frequency / inter-technology points of equal or lower priority. Simultaneously, the measurement interval can be increased for high-priority inter-frequency / inter-technology frequency points. Specifically:

[0118] When the terminal's RSRP on the serving cell is higher than the configured threshold parameter SIntraSearchP and the terminal's RSRQ on the serving cell is higher than the threshold parameter SIntraSearchQ, the terminal may not initiate RRM measurement for neighboring cells at the same frequency point.

[0119] When the terminal's RSRP on the serving cell is higher than the threshold parameter SnonIntraSearchP and the terminal's RSRQ on the serving cell is higher than the threshold parameter SnonIntraSearchQ, the terminal may not initiate RRM measurements for neighboring cells of low priority and equal priority frequencies in different frequencies and systems. At the same time, for high priority frequencies in different frequencies and systems, the terminal may initiate relaxed RRM measurements.

[0120] For terminals that need to perform neighbor cell RRM measurements, it is necessary to introduce a set of neighbor cell RRM measurement relaxation mechanisms to further meet the terminal's power saving needs.

[0121] The NR R16 standard introduces two sets of relaxed measurement criteria for RRM measurements of non-connected terminals: the "terminal not located at the cell edge" criterion and the "low mobility" criterion. Both criteria are based on "cell-level" measurements of the terminal in the serving cell. These two criteria are described below.

[0122] 1. The "Terminal is not located at the cell edge" rule

[0123] To meet this criterion, the network will configure an RSRP threshold and an RSRQ threshold. When the terminal's RSRP on the serving cell is greater than the RSRP threshold, and the terminal's RSRQ on the serving cell is greater than the RSRQ threshold when the network has configured an RSRQ threshold, then the terminal is considered to meet the "terminal is not located at the cell edge" criterion.

[0124] The RSRP threshold configured in the network for the "terminal is not located at the cell edge" criterion must be less than SIntraSearchP and SnonIntraSearchP. If the network also configures an RSRQ threshold for the "terminal is not located at the cell edge" criterion, then the RSRQ threshold used for the "terminal is not located at the cell edge" criterion must be less than SIntraSearchQ and SnonIntraSearchQ.

[0125] 2. "Low Mobility" Criterion

[0126] For this criterion, the network will configure the evaluation period for RSRP changes, TSearchDeltaP, and the RSRP change value threshold, SSearchDeltaP. Figure 3 is a schematic diagram of the low mobility criterion. As shown in Figure 3, when the change in RSRP of a terminal on the serving cell is less than SSearchDeltaP within a period of time, TSearchDeltaP, the terminal is considered to meet the "low mobility" criterion.

[0127] It should be noted that the NR R17 standard further enhances the "low mobility" criterion introduced in R16. The main change is the introduction of a second SSearchDeltaP and a second TSearchDeltaP to support further relaxation of measurements for low mobility scenarios (such as stationary or quasi-stationary terminals) (reflected in a larger scaling factor).

[0128] After completing cell selection / reselection, the terminal needs to perform normal RRM measurements within at least a certain period of TSearchDeltaP.

[0129] For RRM measurements at frequencies of equal or low priority, different RRM measurement relaxation criteria are defined for different RRM measurement relaxation methods. Specifically:

[0130] When a terminal meets the "low mobility" criterion, it uses a longer measurement interval when performing RRM measurements on neighboring cells. A fixed scaling factor is used to increase the measurement interval.

[0131] When the terminal meets the criterion of "the terminal is not located at the cell edge", the terminal uses a longer measurement interval when performing RRM measurements on neighboring cells. A fixed scaling factor is used to increase the measurement interval.

[0132] When a terminal simultaneously meets the "low mobility" criterion and the "terminal is not located at the cell edge" criterion, the measurement interval for the terminal at the same frequency point, different frequency point, and different technology frequency point is increased to 1 hour.

[0133] Currently, network energy saving is a key issue in the field of communications. It's necessary to consider how to achieve network energy saving while still fulfilling basic network functions, such as initial access, cell search, and RRM measurement. Even a primary cell (PCell) needs to achieve network energy saving, which means that a cell in a network-saving state will affect the UE's cell search and RRM measurement, thus impacting the UE's initial access and mobility. Specifically, for UEs in an idle or inactive state, an NES cell can be used as a cell for cell selection; for UEs undergoing initial access, the NES cell can be used as an accessible cell. Therefore, an NES cell is a cell in an energy-saving state, but it can still be used as an accessible cell, and can possess the functions of a non-NES cell when needed. The embodiments of this application enable NES cells to support UE identification, camping, and access while achieving network energy saving.

[0134] Figure 4 is a schematic flowchart of an information transmission method according to an embodiment of this application. This method can optionally be applied to the system shown in Figure 1, but is not limited thereto. The method includes at least a portion of the following:

[0135] S410, The terminal device sends first information to the network device of the first cell; wherein, the first information is used by the network device of the first cell to determine to send second information to the network device of the second cell, and the second information is used to trigger the network device of the second cell to send a discovery signal.

[0136] Optionally, the first cell is the serving cell that establishes an RRC connection with the terminal device, or the cell where the terminal device is camped. For example, for a terminal device in a connected state, the first cell can be the primary cell that establishes an RRC connection with the terminal device; for a cell in an idle or inactive state, the first cell can be the cell where the terminal device is camped.

[0137] For example, step S410 may include: when the terminal device is in a connected state, the terminal device sends first information to the network device of the serving cell; and / or, when the terminal device is in an idle state or an inactive state, the terminal device sends first information to the network device of the cell where it is camped.

[0138] In this embodiment, the first information is used by the network device of the first cell to determine whether to send second information to the network device of the second cell, and the second information is used to trigger the network device of the second cell to send a discovery signal. In other words, the first information is used to trigger the network device of the first cell to send the second information to the network device of the second cell, thereby triggering the network device of the second cell to send a discovery signal.

[0139] The discovery signal is used to discover and / or measure a cell. Optionally, the second cell is a neighboring cell of the first cell. When the network equipment in the second cell sends a discovery signal, terminal devices within the coverage area of ​​the second cell can discover and / or measure the second cell, thereby enabling terminal devices to identify, camp on, and access the second cell.

[0140] Specifically, the purpose of RRM measurement for terminal devices is to measure neighboring cells on the same or different frequencies and, according to certain criteria, perform cell handover, cell selection, and cell reselection to meet the mobility management requirements of terminal devices, ensuring they maintain network connectivity while moving. For example, when a network device in a second cell sends a discovery signal, the terminal device can determine whether to perform cell handover, cell selection, or cell reselection based on the measured RSRP, RSRQ, and other measurement results. For instance, a terminal device in a connected state can determine whether to perform cell handover based on the measurement results corresponding to the discovery signal, while a terminal device in an idle or inactive state can determine whether to perform cell selection or cell reselection based on the measurement results corresponding to the discovery signal.

[0141] Optionally, the second cell is an NES cell, or the second cell is a cell in NES / energy-saving state.

[0142] For example, in this embodiment, a cell may include two states: a normal state and an NES state (network energy-saving state, also known as an energy-saving state). For a cell in the normal state, the network device can send synchronization signals, broadcast messages, and system messages. These messages can be used by the UE to identify the cell and obtain system messages, thereby camping on or accessing the cell. For example, in a cell in the normal state, the network sends a cell-defining SSB. The PBCH in the SSB carries broadcast messages, and resource information for the PDCCH used to schedule system message SIB1 can be obtained based on the broadcast messages, thereby detecting the PDCCH reception of SIB1. For a cell in the NES state, the network device can reduce the transmission of common signals, such as synchronization signals and system messages. For example, in this embodiment, the discovery signal is sent in an on-demand (OD) manner, triggered by first information and second information. This discovery signal can also be called an OD discovery signal. If the terminal device does not send the first information, the network device of the second cell does not send a discovery signal, thereby improving energy saving.

[0143] Optionally, the discovery signal can be the same signal used for cell search; for example, the discovery signal can be an SSB. It is understood that the discovery signal can also be other signals. For example, for a cell in NES state, the network device sends a signal different from the signal used for cell search as the discovery signal. This application does not limit the signal type of the discovery signal.

[0144] Corresponding to the above method, FIG5 is a schematic flowchart of an information transmission method performed by a network device of a first cell according to an embodiment of the present application, the method including:

[0145] S510. In response to the first information from the terminal device, the network device of the first cell sends the second information to the network device of the second cell; wherein the second information is used to trigger the network device of the second cell to send a discovery signal.

[0146] According to the method described in the embodiments of this application, the terminal device sends first information to the network device of the first cell, triggering the network device of the first cell to send second information to the network device of the second cell, thereby triggering the network device of the second cell to send a discovery signal. Therefore, the network device of the second cell can reduce the sending of discovery signals and send discovery signals only when the terminal device needs them, thereby improving the network energy saving effect.

[0147] In some embodiments, the first information is transmitted when a first condition is met. Specifically, sending the first information from a terminal device to a network device in a first cell may include: the terminal device sending the first information to the network device in the first cell when the first condition is met.

[0148] In related technologies, when the channel quality of the terminal device in the first cell is good, RRM measurements for frequency points of the same frequency or frequency points of equal or low priority but different frequencies / technologies can be omitted. Meanwhile, the measurement interval can be increased for RRM measurements of high-priority frequency points of different frequencies / technologies. In this embodiment, when the channel quality of the terminal device in the first cell is good, the transmission of the discovery signal for the second cell can be omitted. One implementation is to pre-set a first condition related to the channel quality of the first cell. When the first condition is met, the terminal device sends first information to trigger the transmission of the discovery signal for the second cell; when the first condition is not met, the transmission of the discovery signal for the second cell is not triggered. Optionally, the first condition may indicate that the channel quality of the first cell does not meet the requirements, or the first condition may be one of the triggering conditions for cell handover, cell selection, or cell reselection.

[0149] In some embodiments, the first condition includes one or more of the following:

[0150] The measurement result of the downlink signal of the first cell is lower than the first threshold value;

[0151] The duration during which the measurement result is below the first threshold value is greater than or equal to the first duration.

[0152] For example, the first condition includes the measurement result of the downlink signal of the first cell being lower than a first threshold. When the measurement result (e.g., the measured values ​​of RSRP and / or RSRQ) is lower than the first threshold, the first condition is met, and the terminal device triggers the transmission of the discovery signal of the second cell by sending first information.

[0153] For example, the first condition includes the measurement result of the downlink signal of the first cell being lower than a first threshold and the duration of the measurement result being lower than the first threshold being greater than or equal to a first duration. This example, by setting a first duration, ensures that when the measurement result of the downlink signal of the first cell remains lower than the first threshold for the first duration, the first condition is met. The terminal device then triggers the transmission of a discovery signal for the second cell by sending first information, thus reducing the ping-pong effect.

[0154] In some embodiments, the first threshold value and / or the first duration are configured by the network device of the first cell. Optionally, for terminal devices in idle or inactive states, the network device can configure the first threshold value and / or the first duration via system messages.

[0155] In some embodiments, the first information includes one or more of the following:

[0156] Measurement results of the downlink signal in the first cell;

[0157] Information used to indicate that the measurement result meets the first condition.

[0158] For example, the first information includes the measurement results of the downlink signal of the first cell. That is, the terminal device reports the measurement results of the downlink signal of the first cell to the network device of the first cell through the first information. Optionally, the terminal device may periodically or based on pre-configured resources report the measurement results of the downlink signal. Based on this, the network device of the first cell may decide whether to trigger the transmission of the discovery signal of the second cell. For example, the network device of the first cell may determine whether to send the second information to the network device of the second cell based on the measurement results of the downlink signal of the first cell. For example, when the measurement results meet the conditions for triggering the transmission of the discovery signal of the second cell (e.g., the first condition), the network device of the first cell determines to trigger the transmission of the discovery signal of the second cell.

[0159] For example, the first information includes information indicating that the measurement result of the downlink signal of the first cell meets a first condition. Optionally, the terminal device can determine whether the first condition for triggering the transmission of a discovery signal of the second cell is met based on the measurement result of the downlink signal of the first cell and a configured threshold value. When the first condition is met, the terminal device can send indication information to the network device of the first cell, indicating that the measurement result meets the first condition. Upon receiving the indication information, the network device of the first cell sends second information to the network device of the second cell, triggering the transmission of a discovery signal of the second cell. It is understood that the network device of the first cell may also choose not to send the second information; this can be implemented by the network device of the first cell itself.

[0160] For example, the first information includes the measurement result of the downlink signal of the first cell and information indicating that the measurement result meets a first condition. Optionally, the terminal device may report the measurement result of the downlink signal to the network device of the first cell when the first condition is met, and simultaneously indicate that the measurement result meets the first condition. Based on this, the network device of the first cell can decide whether to trigger the transmission of the discovery signal of the second cell, and send the first information if necessary, which can reduce the transmission overhead of the first information.

[0161] Optionally, the downlink signal of the first cell is a measurement reference signal (or measurement signal). For example, the downlink signal may include SSB and / or CSI-RS, etc.

[0162] Figure 6 is a schematic diagram of an application example of the information transmission method according to an embodiment of this application. When the network device of the first cell receives the first information (including measurement results and / or indication information) reported by the terminal device, it can carry the second information through the backhaul link between the network devices to trigger the neighboring cell to send a discovery signal. As shown in Figure 6, cell 1 is the serving cell of UE1, i.e., the first cell; UE1 measures the downlink signal, and when the measurement result meets the conditions for triggering the transmission of the neighboring cell's discovery signal, it reports it to the serving cell. The network device of the serving cell sends the second information to the neighboring cell through the backhaul with the neighboring cell, controlling the neighboring cell to send a discovery signal. Among them, cells 2-7 are the neighboring cells of cell 1 and are in NES state. When neighboring cells 2-7 receive the second information from cell 1, they send a discovery signal. UE1 can measure the discovery signal of the neighboring cell.

[0163] In some embodiments, the second cell includes cells in the neighbor cell list of the first cell, that is, the target cell for the network device of the first cell to send the second information, which may be a cell in the neighbor cell list of the first cell. Optionally, the neighbor cell list may include a co-frequency neighbor cell list and / or a different-frequency neighbor cell list. For example, the co-frequency neighbor cell list may be the intraFreqNeighCellList indicated by the network device through SIB information; the different-frequency neighbor cell list may be the InterFreqNeighCellList indicated by the network device through SIB. By triggering cells in the neighbor cell list to send discovery signals, the terminal device can easily perform cell selection and cell reselection.

[0164] In some embodiments, the second cell is determined based on frequency priority. For example, the network device of the first cell can trigger neighboring cells to send discovery signals based on frequency priority, from high to low.

[0165] In some embodiments, the frequency of the second cell has a higher priority than the frequency of the first cell. That is, the target cell for the first cell to send the second information can be a cell with a high priority frequency in the first cell's neighbor cell list.

[0166] For example, network devices indicate cell reselection priority information (e.g., the parameter CellReselectionPriority) through SIB information. This priority information indicates the priority of the cell's carrier frequency when the terminal device performs cell reselection. Priorities range from 0 to 7, where 0 is the lowest priority and 7 is the highest priority. Therefore, the target cell for the network device of the first cell to send the second information can be a cell on a frequency with a higher priority than the frequency of the first cell.

[0167] In some embodiments, the information transmission method further includes: if the terminal device does not measure a discovery signal that satisfies the second condition, the terminal device sends third information to the network device of the first cell; wherein the third information is used by the network device of the first cell to determine to send fourth information to the network device of the third cell; the fourth information is used to trigger the network device of the third cell to send a discovery signal.

[0168] Accordingly, in some embodiments, for the network devices of the first cell, the information transmission method further includes:

[0169] In response to the third information from the terminal device, the network device of the first cell sends a fourth information to the network device of the third cell; wherein the fourth information is used to trigger the network device of the third cell to send a discovery signal.

[0170] For example, the third information can be used to indicate that the terminal device has not measured a discovery signal that meets the second condition. Optionally, the second condition may include that the discovery signal meets quality requirements, or that the quality of the discovery signal meets the requirements for cell handover / cell selection or cell reselection, for example, the measurement result of the discovery signal (such as the measured value of RSRP and / or RSRQ) is greater than or equal to a second threshold value. When the terminal device does not measure a discovery signal that meets the quality requirements, that is, the terminal device has not measured a cell that meets the quality requirements, it can indicate this to the network device of the first cell through the third information. The network device of the first cell can trigger more cells (including the third cell) to send discovery signals.

[0171] In some embodiments, the third cell is determined based on frequency priority.

[0172] For example, when the priority of the frequency point where the second cell is located is higher than the priority of the frequency point where the first cell is located, the third cell can be a cell on the same frequency point or with the same priority as the frequency point where the first cell is located; when the second cell is a cell on the same frequency point or with the same priority as the frequency point where the first cell is located, the third cell can be a cell on a frequency point with a lower priority than the frequency point where the first cell is located.

[0173] Alternatively, the frequency of the second cell has a higher priority than that of the first cell, and the third cell is a cell on the same frequency or with the same priority as the first cell. If the terminal device still fails to measure a discovery signal that meets the second condition, the terminal device may send the third information again to cause the first network device to send the sixth information to the network device of the fourth cell. The sixth information is used to trigger the network device of the fourth cell to send a discovery signal.

[0174] For example, if the network device of the first cell triggers the transmission of a discovery signal for a neighboring cell on a high-priority frequency, but the terminal device still cannot measure a cell that meets the quality requirements, it can send a third message to the first cell. The first cell can then send a fourth message to cells on the same frequency and with the same priority, triggering the transmission of discovery signals for these cells. Similarly, the terminal device can further send a third message to the first cell, requesting the first cell to trigger cells on low-priority frequencies to transmit discovery signals.

[0175] In some embodiments, the first information is further used to indicate beam information or downlink signal index information corresponding to the measurement result associated with the first information, the beam information or downlink signal index information being used by the network device of the first cell to determine the second cell. Here, the measurement result associated with the first information may include the measurement result in the first information; or, when the first information includes information indicating that the measurement result satisfies a first condition, the measurement result associated with the first information includes the measurement result that satisfies the first condition.

[0176] Accordingly, for the network equipment in the first cell, the network equipment in the first cell determines the second cell based on the beam information or downlink signal index information corresponding to the measurement result. For example, the first information includes the measurement results of multiple beams and the beam information or downlink signal index information corresponding to each measurement result; the network equipment in the first cell determines whether to trigger a neighboring cell to send a discovery signal based on the measurement results of multiple beams. When triggering is determined, the target cell (i.e., the second cell) to be triggered is determined based on the beam information or downlink signal index information corresponding to the better measurement result. Alternatively, the first information includes information indicating that the measurement results of one or more beams meet a first condition and the beam information or downlink signal index information corresponding to the measurement result. Upon receiving the first information, the network equipment in the first cell determines to trigger a neighboring cell to send a discovery signal, and determines the target cell (i.e., the second cell) to be triggered based on the beam information or downlink signal index information corresponding to the measurement result.

[0177] This embodiment achieves further energy savings by more accurately identifying the second cell and triggering the transmission of a discovery signal with better quality for the terminal device, thereby reducing the transmission of discovery signals from other cells.

[0178] For example, the network equipment in the first cell can trigger neighboring cells to send discovery signals according to priority. However, the selection of neighboring cells to trigger the discovery signal is still relatively random. As shown in Figure 6, UE1 is located close to cells 3 and 4. If cell reselection is performed through measurement, it is highly likely that it will choose to camp on these two cells. However, since the network equipment in the first cell (cell 1) does not know the specific location of UE1, it can only trigger all neighboring cells 2-7 of cell 1 to start sending discovery signals. Considering that downlink signals can be transmitted in a beam scanning manner, the downlink signals measured by UE1 have spatial attributes. Beams have a certain directionality. When UE1 measures the downlink signals of different beams in cell 1, there will be different measurement quality results for different beams. Often, the downlink signal with better measurement results corresponds to the beam that covers UE1. The coverage direction of this beam is also the orientation of UE1 within the coverage area of ​​the serving cell. When UE1 sends the first information to the serving cell, it can report the beam information or downlink signal index information corresponding to the measurement result, such as the SSB index information, to cell 1. Cell 1 can use this information to determine the neighboring cells that are close in the direction of the downlink signal beam and trigger these neighboring cells to send discovery signals through indication information.

[0179] Optionally, the beam used by the downlink signal is associated with the downlink signal index information. Therefore, the first information may include either the beam information corresponding to the measurement result or the downlink signal index information. The first cell may determine the corresponding coverage direction based on the beam information or the downlink signal index information, thereby determining the second cell.

[0180] In some embodiments, the beam information or downlink signal index information reported by the terminal device can be indicated explicitly, for example, as described in the above example, by including the beam information or downlink signal index information in the first information.

[0181] In some embodiments, beam information or downlink signal index information may also be implicitly indicated by the resources of the channel or signal carrying the first information. For example, the resources of the channel or signal carrying the first information are associated with the beam information or downlink signal index information.

[0182] For example, in a 5G system, Physical Random Access Channel (PRACH) resources are associated with SSB indexes. Terminal devices can select the PRACH resource associated with the index of a high-quality SSB based on the measurement results of the serving cell (first cell)'s SSBs, and transmit the PRACH carrying initial information.

[0183] In other words, if the resources of the channel or signal that report the first information on the terminal device correspond to the beam or index information of the downlink signal, the beam or index information of the downlink signal can be implicitly indicated by the resources of the signal or channel carrying the first information.

[0184] Specifically, the resource carrying the first information, the channel or signal, is associated with the SSB index. This association can be one-to-one, many-to-one, or many-to-many. When the resource has a one-to-one or many-to-one association with the SSB index (i.e., one or more resources correspond to one SSB index), each SSB index is associated with the time-domain resource location, frequency-domain resource location, or a set of time-domain resource locations or a set of resource locations for the channel or signal. For example, the resource location of the channel or signal has a certain time-domain offset and / or frequency-domain offset from the resource location of the SSB corresponding to the SSB index. The resource location of the channel or signal can be predefined, determined according to preset rules, or indicated by the MIB. For example, similar to the MIB indicating the resource location of Type 0-PDCCH, the MIB can indicate information such as the listening time, number of symbols, number of RBs, and frequency offset of the resource associated with the SSB. The above process can be indicated through system information or MIB information.

[0185] Figure 7 is a schematic diagram of the resources carrying the first information channel or signal. As shown in Figure 7, there are 4 SSBs transmitting in the cell. SSBs 0-3 are associated with channel or signal resources, namely resources 1-4. There are time-domain and frequency-domain offsets between the SSBs and the associated resources. Optionally, the time-domain and frequency-domain offsets can be determined according to preset rules or MIB indications.

[0186] In some embodiments, the resources of the channel or signal carrying the first information can also be configured through the RRC signaling of the first cell.

[0187] Figure 8 is a schematic diagram of another application example of the information transmission method according to an embodiment of this application. As shown in Figure 8, cell 1 is the serving cell of UE1 and UE2. UE1 and UE2 measure downlink signal 1 and downlink signal 2 respectively. When the measurement results meet the conditions for triggering the transmission of the OD discovery signal of a neighboring cell, they report first information to the serving cell. In the coverage direction of downlink signal 1, neighboring cells 3 and 4 are relatively close. In the coverage direction of downlink signal 2, neighboring cells 6 and 7 are relatively close. When the first information reported by UE1 and UE2 to the serving cell contains the index information of the downlink signal, the serving cell can determine the target cell that needs to be triggered to send the discovery signal. For UE1, the serving cell needs to trigger the transmission of cell 3 and 4 discovery signals. For UE2, the serving cell needs to trigger the transmission of cell 6 and 7 discovery signals. The network device of the serving cell sends second information to the neighboring cells through backhaul with the neighboring cells, controlling the neighboring cells to send discovery signals.

[0188] In some embodiments, the aforementioned beam information or downlink signal index information is further used by the network device of the first cell to determine the beam or index information of the discovery signal transmitted by the network device of the second cell. For example, the network device of the first cell can determine the beam of the discovery signal transmitted by the network device of the second cell based on the beam information or downlink signal index information in the first information; or, the network device of the second cell can determine the index information of the discovery signal based on the beam information or downlink signal index information in the first information.

[0189] In some embodiments, the network device of the first cell can indicate to the network device of the second cell, via second indication information, the beam to be used for the discovery signal or the index of the discovery signal. That is, the second information is also used to indicate the beam for transmitting the discovery signal or the index information of the discovery signal; wherein the beam or the index information of the discovery signal is determined based on the beam information or the index information of the downlink signal.

[0190] The first cell determines the downlink beam of a neighboring cell that is closer in the direction of the downlink signal coverage by the downlink signal based on the index information of the beam or downlink signal reported by the terminal device. Then, it triggers these neighboring cells to send discovery signals on the corresponding downlink beams through the second information, which can reduce the transmission of discovery signals of other beams and achieve further energy saving of the network.

[0191] Figure 9 is a schematic diagram of another application example of the information transmission method according to an embodiment of this application. As shown in Figure 9, UE1 and UE2 measure downlink signal 1 and downlink signal 2 respectively. When the measurement results meet the conditions for triggering the transmission of the OD discovery signal of the neighboring cell, they report to the serving cell. In the coverage direction of downlink signal 1, some downlink beams are relatively close to neighboring cells 3 and 4. In the coverage direction of downlink signal 2, some downlink beams are relatively close to neighboring cells 6 and 7. When the first information reported by UE1 and UE2 to the serving cell includes the index information of the downlink signal, the serving cell can determine the target cell that needs to trigger the transmission of the discovery signal and the beam on which the discovery signal is transmitted. For UE1, the serving cell needs to trigger cells 3 and 4 to transmit discovery signals on one beam respectively. For UE2, the serving cell needs to trigger cells 6 and 7 to transmit discovery signals on one beam respectively. Furthermore, the serving cell can also trigger the target cell to transmit discovery signals on multiple beams to improve the reliability of the measurement.

[0192] In some embodiments, the information transmission method further includes: if the terminal device does not measure a discovery signal that satisfies the second condition, the terminal device sends third information to the network device of the first cell; wherein the third information is used by the network device of the first cell to determine to send fifth information to the network device of the second cell; the fifth information is used to trigger the network device of the second cell to increase the beam for transmitting the discovery signal.

[0193] Accordingly, in some embodiments, for the network device of the first cell, the information transmission method further includes: in response to third information from the terminal device, the network device of the first cell sends fifth information to the network device of the second cell; the fifth information is used to trigger the network device of the second cell to increase the beam for transmitting the discovery signal.

[0194] For example, the third information can be used to indicate that the terminal device has not measured a discovery signal that meets the second condition. Optionally, the second condition may include that the discovery signal meets quality requirements, or that the quality of the discovery signal meets the requirements for cell handover / cell selection or cell reselection, for example, the measurement result of the discovery signal (such as the measured value of RSRP and / or RSRQ) is greater than or equal to a second threshold value. When the terminal device does not measure a discovery signal that meets the quality requirements, that is, the terminal device has not measured a cell that meets the quality requirements, it can indicate this to the network device of the first cell through the third information. The network device of the first cell can trigger the second cell to increase the number of beams transmitting the discovery signal through the fifth information. For example, the network device of the first cell can instruct the second cell to open more beams to transmit the discovery signal based on the correlation between the downlink signal and the coverage of each beam of the second cell.

[0195] Optionally, the above embodiments can also be combined with the aforementioned embodiments that trigger a third cell to send a discovery signal. Specifically, if the terminal device does not measure a discovery signal that meets the second condition, the terminal device sends third information to the network device of the first cell; wherein, the third information is used by the network device of the first cell to determine to send fourth information to the network device of the third cell, and / or to send fifth information to the network device of the second cell; the fourth information is used to trigger the network device of the third cell to send a discovery signal; the fifth information is used to trigger the network device of the second cell to increase the beam for sending the discovery signal.

[0196] Accordingly, in some embodiments, for the network device of the first cell, the information transmission method further includes: in response to third information from the terminal device, the network device of the first cell sends fourth information to the network device of the third cell, and / or sends fifth information to the network device of the second cell; wherein the fourth information is used to trigger the network device of the third cell to send a discovery signal; and the fifth information is used to trigger the network device of the second cell to increase the beam for sending the discovery signal.

[0197] That is, after the discovery signal triggering process of the second cell is completed, if the terminal equipment measures that the signal quality of the neighboring cells does not meet the requirements for handover, cell selection, or cell reselection, it can report third information to the first cell. The first cell can trigger more cells (including the third cell) and / or trigger the second cell to use more beams to send discovery signals.

[0198] For example, the third cell is determined based on one or more of the following: frequency priority; beam information or downlink signal index information corresponding to the measurement results associated with the first information.

[0199] For example, the network equipment in the first cell can start sending discovery signals to more cells according to the priority of the cell frequency, or according to the correlation of the coverage of neighboring cells.

[0200] In some embodiments, the information transmission method further includes:

[0201] If the third condition is met, the terminal device sends a trigger signal; wherein the trigger signal is used to trigger the network device that receives the trigger signal to send a discovery signal.

[0202] Optionally, the third condition may be that the terminal device fails to successfully report the first information to the network device of the first cell. If the third condition is met, the terminal device actively sends a trigger signal, such as an OD signal, to trigger the network device that can receive the trigger signal to send a discovery signal, that is, a neighboring cell that can detect the trigger signal can send a discovery signal.

[0203] In some embodiments, the third condition includes one or more of the following:

[0204] The terminal device experienced a link failure with the first cell;

[0205] The terminal device did not receive any confirmation or feedback information regarding the first information;

[0206] The terminal device did not measure a detection signal that met the second condition.

[0207] For example, when a radio link failure occurs between the terminal device and the first cell, the terminal device cannot successfully report the first information. In this case, the terminal device can actively send a trigger signal.

[0208] For example, even if the signal quality of the first cell is acceptable, if the terminal does not receive confirmation or feedback from the first cell after reporting the first information, the terminal device can actively send a trigger signal.

[0209] For example, if the terminal device successfully reports the first information to the first cell and receives a response from the first cell, but the measured quality of the neighboring cell's discovery signal does not meet the requirements for handover, cell selection, or cell reselection, the terminal device can actively send a trigger signal.

[0210] Optionally, the resources for triggering the signal are pre-configured or configured by the network equipment of the first cell.

[0211] Accordingly, for the network equipment in the first cell, the information transmission methods also include:

[0212] The network equipment in the first cell configures resources for the terminal device to send a trigger signal when a third condition is met; wherein the third condition includes one or more of the following:

[0213] The terminal device experienced a link failure with the first cell;

[0214] The terminal device did not receive any confirmation or feedback information regarding the first information;

[0215] The terminal device did not measure a detection signal that met the second condition.

[0216] For example, the network equipment in the first cell configures the resources for triggering signals through system information and RRC signaling. Furthermore, the resources for triggering signals can also be preset; for instance, terminal equipment can send trigger signals on preset frequency resources, facilitating detection by other cells.

[0217] Corresponding to the above method, FIG10 is a schematic flowchart of an information transmission method performed by a network device of a second cell according to another embodiment of the present application, the method comprising:

[0218] S1010, In response to the second information from the network device of the first cell, the network device of the second cell sends a discovery signal; wherein the discovery signal is used by the terminal device to perform cell measurement.

[0219] In some embodiments, the second information is further used to indicate the beam transmitting the discovery signal or the index information of the discovery signal. The network device of the second cell can determine the beam transmitting the discovery signal or the index information of the discovery signal based on the second information.

[0220] In some embodiments, the information transmission method further includes:

[0221] The network device of the second cell receives fifth information from the network device of the first cell; wherein, the fifth information is used to trigger the network device of the second cell to increase the beam for transmitting the discovery signal.

[0222] In some embodiments, the information transmission method further includes:

[0223] In response to a trigger signal from a terminal device, the network device of the second cell sends the discovery signal.

[0224] Specific examples of the methods executed by the network device of the second cell in some embodiments of this application can be found in the relevant descriptions of the network device of the second cell in any of the foregoing embodiments, which will not be repeated here for the sake of brevity.

[0225] Figure 11 is a schematic block diagram of a terminal device 1100 according to an embodiment of the present application. The terminal device 1100 may include:

[0226] The first communication module 1110 is used to send first information to the network device of the first cell; wherein, the first information is used by the network device of the first cell to determine to send second information to the network device of the second cell, and the second information is used to trigger the network device of the second cell to send a discovery signal.

[0227] In some embodiments, the first information includes one or more of the following:

[0228] Measurement results of downlink signal in the first cell;

[0229] Information used to indicate that the measurement result meets the first condition.

[0230] In some embodiments, the first communication module 1110 is further configured to:

[0231] If the first condition is met, send the first information to the network device of the first cell.

[0232] In some embodiments, the first condition includes one of the following:

[0233] The measurement result of the downlink signal in the first cell is lower than the first threshold value;

[0234] The duration during which the measurement result is below the first threshold is greater than or equal to the first duration.

[0235] In some embodiments, the first threshold value and / or the first duration are configured by the network equipment of the first cell.

[0236] In some embodiments, the second cell includes cells in the neighbor list of the first cell.

[0237] In some embodiments, the second cell is determined based on frequency priority.

[0238] In some embodiments, the frequency of the second cell has a higher priority than the frequency of the first cell.

[0239] In some embodiments, the first information is further used to indicate the beam information or downlink signal index information corresponding to the measurement result associated with the first information, and the beam information or downlink signal index information is used by the network device of the first cell to determine the second cell.

[0240] In some embodiments, the resources of the channel or signal carrying the first information are associated with beam information or downlink signal index information.

[0241] In some embodiments, the beam information or downlink signal index information is also used by the network device of the first cell to determine the beam or index information of the discovery signal sent by the network device of the second cell.

[0242] In some embodiments, the first communication module 1110 is further configured to:

[0243] If no detection signal meeting the second condition is measured, the third information is sent to the network equipment of the first cell;

[0244] The third information is used by the network device of the first cell to determine whether to send the fourth information to the network device of the third cell, and / or send the fifth information to the network device of the second cell; the fourth information is used to trigger the network device of the third cell to send a discovery signal; and the fifth information is used to trigger the network device of the second cell to increase the beam for sending the discovery signal.

[0245] In some embodiments, the third cell is determined based on one or more of the following:

[0246] Frequency priority;

[0247] The first piece of information is the beam information or downlink signal index information corresponding to the measurement results associated with the measurement results.

[0248] In some embodiments, the first communication module 1110 is further configured to:

[0249] If the third condition is met, a trigger signal is sent; wherein, the trigger signal is used to trigger the network device that receives the trigger signal to send a discovery signal.

[0250] In some embodiments, the third condition includes one or more of the following:

[0251] The terminal device experienced a link failure with the first cell;

[0252] The terminal device did not receive any confirmation or feedback information regarding the first piece of information;

[0253] The terminal device did not measure a detection signal that meets the second condition.

[0254] In some embodiments, the resources for triggering the signal are pre-configured or configured by the network equipment of the first cell.

[0255] In some embodiments, the first cell includes:

[0256] The primary cell that establishes a Radio Resource Control (RRC) connection with the terminal equipment; or,

[0257] The residential area where the terminal equipment is located.

[0258] The terminal device 1100 of this application embodiment can realize the corresponding functions of the terminal device in the foregoing method embodiments. The processes, functions, implementation methods, and beneficial effects of each module (sub-module, unit, or component, etc.) in the terminal device 1100 can be found in the corresponding descriptions in the above method embodiments, and will not be repeated here. It should be noted that the functions described for each module (sub-module, unit, or component, etc.) in the terminal device 1100 of the application embodiment can be implemented by different modules (sub-modules, units, or components, etc.) or by the same module (sub-module, unit, or component, etc.).

[0259] Figure 12 is a schematic block diagram of a first network device 1200 according to an embodiment of the present application. The first network device 1200 may include:

[0260] The second communication module 1210 is used to send second information to the network device of the second cell in response to the first information from the terminal device; wherein the second information is used to trigger the network device of the second cell to send a discovery signal.

[0261] In some embodiments, the first information includes one or more of the following:

[0262] Measurement results of downlink signal in the first cell;

[0263] Information used to indicate that the measurement result meets the first condition.

[0264] In some embodiments, the first information is transmitted when a first condition is met.

[0265] In some embodiments, the first condition includes one of the following:

[0266] The measurement result of the downlink signal in the first cell is lower than the first threshold value;

[0267] The duration during which the measurement result is below the first threshold is greater than or equal to the first duration.

[0268] In some embodiments, the first threshold value and / or the first duration are configured by the network equipment of the first cell.

[0269] In some embodiments, the second cell includes cells in the neighbor list of the first cell.

[0270] In some embodiments, the second cell is determined based on frequency priority.

[0271] In some embodiments, the frequency of the second cell has a higher priority than the frequency of the first cell.

[0272] In some embodiments, the first information is further used to indicate the beam information or downlink signal index information corresponding to the measurement result associated with the first information, and the beam information or downlink signal index information is used by the network device of the first cell to determine the second cell.

[0273] In some embodiments, the resources of the channel or signal carrying the first information are associated with beam information or downlink signal index information.

[0274] In some embodiments, the second information is further used to indicate the beam that transmits the discovery signal or the index information of the discovery signal; wherein the beam or the index information of the discovery signal is determined based on the beam information or the index information of the downlink signal.

[0275] In some embodiments, the second communication module 1210 is further configured to:

[0276] In response to the third information from the terminal device, a fourth information is sent to the network device of the third cell, and / or a fifth information is sent to the network device of the second cell;

[0277] The fourth piece of information is used to trigger the network equipment in the third cell to send a discovery signal; the fifth piece of information is used to trigger the network equipment in the second cell to increase the beam used to send the discovery signal.

[0278] In some embodiments, the third cell is determined based on one or more of the following:

[0279] Frequency priority;

[0280] The first piece of information is the beam information or downlink signal index information corresponding to the measurement results associated with the measurement results.

[0281] In some embodiments, as shown in FIG13, the first network device 1200 may further include a first processing module 1310, the first processing module 1310 being used for:

[0282] Configure resources for the terminal device to send a trigger signal when a third condition is met; wherein the third condition includes one or more of the following:

[0283] The terminal device experienced a link failure with the first cell;

[0284] The terminal device did not receive any confirmation or feedback information regarding the first piece of information;

[0285] The terminal device did not measure a detection signal that meets the second condition.

[0286] In some embodiments, the first cell includes:

[0287] The primary cell that establishes an RRC connection with the terminal equipment; or,

[0288] The residential area where the terminal equipment is located.

[0289] The first network device 1200 of this application embodiment can realize the corresponding functions of the network device of the first cell in the aforementioned method embodiment. The processes, functions, implementation methods, and beneficial effects of each module (sub-module, unit, or component, etc.) in the first network device 1200 can be found in the corresponding descriptions in the above method embodiments, and will not be repeated here. It should be noted that the functions described for each module (sub-module, unit, or component, etc.) in the first network device 1200 of the application embodiment can be implemented by different modules (sub-modules, units, or components, etc.) or by the same module (sub-module, unit, or component, etc.).

[0290] Figure 14 is a schematic block diagram of a second network device 1400 according to an embodiment of the present application. The second network device 1400 may include:

[0291] The third communication module 1410 is used to send a discovery signal in response to second information from the network device of the first cell; wherein the discovery signal is used by the terminal device to perform cell measurement.

[0292] In some embodiments, the second information is used to indicate the beam from which the discovery signal is transmitted or the index information of the discovery signal.

[0293] In some embodiments, the third communication module 1410 is further configured to:

[0294] The fifth message is received from the network device of the first cell; wherein the fifth message is used to trigger the network device of the second cell to increase the beam for transmitting the discovery signal.

[0295] In some embodiments, the third communication module 1410 is further configured to:

[0296] In response to a trigger signal from a terminal device, a discovery signal is sent.

[0297] The second network device 1400 in this application embodiment can implement the corresponding functions of the network device of the second cell in the aforementioned method embodiment. The processes, functions, implementation methods, and beneficial effects of each module (sub-module, unit, or component, etc.) in the second network device 1400 can be found in the corresponding descriptions in the above method embodiments, and will not be repeated here. It should be noted that the functions described for each module (sub-module, unit, or component, etc.) in the second network device 1400 of this application embodiment can be implemented by different modules (sub-modules, units, or components, etc.) or by the same module (sub-module, unit, or component, etc.).

[0298] Figure 15 is a schematic structural diagram of a communication device 1500 according to an embodiment of this application. The communication device 1500 includes a processor 1510, which can call and run computer programs from memory to enable the communication device 1500 to implement the methods in the embodiments of this application.

[0299] In one embodiment, the communication device 1500 may further include a memory 1520. The processor 1510 can retrieve and run computer programs from the memory 1520 to enable the communication device 1500 to implement the methods described in the embodiments of this application.

[0300] The memory 1520 can be a separate device independent of the processor 1510, or it can be integrated into the processor 1510.

[0301] In one embodiment, the communication device 1500 may further include a transceiver 1530, and the processor 1510 may control the transceiver 1530 to communicate with other devices. Specifically, it may send information or data to other devices or receive information or data sent by other devices.

[0302] The transceiver 1530 may include a transmitter and a receiver. The transceiver 1530 may further include an antenna, and the number of antennas may be one or more.

[0303] In one embodiment, the communication device 1500 may be a terminal device in the embodiments of this application, and the communication device 1500 may implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0304] In one embodiment, the communication device 1500 may be the first network device in the embodiments of this application, and the communication device 1500 may implement the corresponding processes implemented by the network device of the first cell in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0305] In one embodiment, the communication device 1500 may be the second network device in the embodiments of this application, and the communication device 1500 may implement the corresponding processes implemented by the network device of the second cell in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0306] Figure 16 is a schematic structural diagram of a chip 1600 according to an embodiment of this application. The chip 1600 includes a processor 1610, which can call and run computer programs from memory to implement the methods in the embodiments of this application.

[0307] In one embodiment, chip 1600 may further include memory 1620. Processor 1610 can retrieve and run computer programs from memory 1620 to implement the methods executed by the terminal device, the first network device, or the second network device in this embodiment.

[0308] The memory 1620 can be a separate device independent of the processor 1610, or it can be integrated into the processor 1610.

[0309] In one embodiment, the chip 1600 may further include an input interface 1630. The processor 1610 can control the input interface 1630 to communicate with other devices or chips; specifically, it can acquire information or data sent by other devices or chips.

[0310] In one embodiment, the chip 1600 may further include an output interface 1640. The processor 1610 can control the output interface 1640 to communicate with other devices or chips; specifically, it can output information or data to other devices or chips.

[0311] In one embodiment, the chip can be applied to the terminal device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the terminal device in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0312] In one implementation, the chip can be applied to the first network device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the network device of the first cell in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0313] In one implementation, the chip can be applied to the second network device in the embodiments of this application, and the chip can implement the corresponding processes implemented by the network device of the second cell in the various methods of the embodiments of this application. For the sake of brevity, it will not be described in detail here.

[0314] The chips used in the terminal equipment, the first network equipment, and the second network equipment can be the same chip or different chips.

[0315] It should be understood that the chip mentioned in the embodiments of this application may also be referred to as a system-on-a-chip, system chip, chip system, or system-on-a-chip, etc.

[0316] The processors mentioned above can be general-purpose processors, digital signal processors (DSPs), field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), or other programmable logic devices, transistor logic devices, discrete hardware components, etc. Among them, the general-purpose processors mentioned above can be microprocessors or any conventional processor.

[0317] The aforementioned memory can be volatile memory or non-volatile memory, or a combination of both. Non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. Volatile memory can be random access memory (RAM).

[0318] It should be understood that the above-described memory is exemplary and not a limiting description. For example, the memory in the embodiments of this application may also be static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct memory bus RAM (DR RAM), etc. That is to say, the memory in the embodiments of this application is intended to include, but is not limited to, these and any other suitable types of memory.

[0319] Figure 17 is a schematic block diagram of a communication system 1700 according to an embodiment of this application. The communication system 1700 includes a terminal device 1710, a first network device 1720, and a second network device 1730. The first network device 1720 is a network device for a first cell; the second network device 1730 is a network device for a second cell.

[0320] Terminal device 1710 is used to send first information to first network device 1720; wherein, the first information is used by first network device 1720 to determine to send second information to second network device 1730, and the second information is used to trigger second network device 1730 to send a discovery signal.

[0321] The first network device 1720 is used to send a second message to the second network device 1730 in response to a first message from the terminal device 1710.

[0322] The second network device 1730 is used to send a discovery signal in response to a second message from the first network device 1720; wherein the discovery signal is used by the terminal device 1710 to perform cell measurement.

[0323] Specifically, the terminal device 1710 can be used to implement the corresponding functions implemented by the terminal device in the above method, the first network device 1720 can be used to implement the corresponding functions implemented by the network device of the first cell in the above method, and the second network device 1730 can be used to implement the corresponding functions implemented by the network device of the second cell in the above method. For the sake of brevity, further details are omitted here.

[0324] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented, in whole or in part, as a computer program product. This computer program product includes one or more computer instructions. When these computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., DVDs), or semiconductor media (e.g., solid-state drives (SSDs)).

[0325] It should be understood that in the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0326] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0327] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An information transmission method, comprising: The terminal device sends first information to the network device of the first cell; wherein, the first information is used by the network device of the first cell to determine to send second information to the network device of the second cell, and the second information is used to trigger the network device of the second cell to send a discovery signal.

2. The method according to claim 1, wherein, The first information includes one or more of the following: Measurement results of the downlink signal in the first cell; Information used to indicate that the measurement result meets the first condition.

3. The method according to claim 1 or 2, wherein, The terminal device sends first information to the network device of the first cell, including: If the first condition is met, the terminal device sends the first information to the network device of the first cell.

4. The method according to claim 2 or 3, wherein, The first condition includes one of the following: The measurement result of the downlink signal of the first cell is lower than the first threshold value; The duration during which the measurement result is below the first threshold is greater than or equal to the first duration.

5. The method according to claim 4, wherein, The first threshold value and / or the first duration are configured by the network equipment of the first cell.

6. The method according to any one of claims 1-5, wherein, The second cell includes cells in the neighbor cell list of the first cell.

7. The method according to any one of claims 1-6, wherein, The second cell is determined based on frequency priority.

8. The method according to any one of claims 1-7, wherein, The frequency of the second cell has a higher priority than the frequency of the first cell.

9. The method according to any one of claims 1-8, wherein, The first information is also used to indicate the beam information or downlink signal index information corresponding to the measurement result associated with the first information, and the beam information or downlink signal index information is used by the network device of the first cell to determine the second cell.

10. The method according to claim 9, wherein, The resources of the channel or signal carrying the first information are related to the beam information or downlink signal index information.

11. The method according to claim 9 or 10, wherein, The beam information or downlink signal index information is also used by the network device of the first cell to determine the beam or index information of the discovery signal sent by the network device of the second cell.

12. The method according to any one of claims 1-11, wherein, The method further includes: If the terminal device does not detect a discovery signal that meets the second condition, the terminal device sends third information to the network device of the first cell; Wherein, the third information is used by the network device of the first cell to determine to send the fourth information to the network device of the third cell, and / or to send the fifth information to the network device of the second cell; the fourth information is used to trigger the network device of the third cell to send a discovery signal; the fifth information is used to trigger the network device of the second cell to increase the beam for sending the discovery signal.

13. The method according to claim 12, wherein, The third cell is determined based on one or more of the following: Frequency priority; The beam information or downlink signal index information corresponding to the measurement results associated with the first information.

14. The method according to any one of claims 1-13, wherein, The method further includes: If the third condition is met, the terminal device sends a trigger signal; wherein the trigger signal is used to trigger the network device that receives the trigger signal to send a discovery signal.

15. The method according to claim 14, wherein, The third condition includes one or more of the following: The terminal device experienced a link failure with the first cell; The terminal device did not receive any confirmation or feedback information regarding the first information; The terminal device did not measure a detection signal that met the second condition.

16. The method according to claim 14 or 15, wherein, The resources for the trigger signal are pre-configured or configured by the network equipment of the first cell.

17. The method according to any one of claims 1-16, wherein, The first cell includes: The primary cell that establishes a Radio Resource Control (RRC) connection with the terminal device; or, The cell where the terminal device is located.

18. An information transmission method, comprising: In response to the first information from the terminal device, the network device in the first cell sends a second information to the network device in the second cell; wherein... The second information is used to trigger the network device of the second cell to send a discovery signal.

19. The method according to claim 18, wherein, The first information includes one or more of the following: Measurement results of the downlink signal in the first cell; Information used to indicate that the measurement result meets the first condition.

20. The method according to claim 18 or 19, wherein, The first information is transmitted when the first condition is met.

21. The method according to claim 19 or 20, wherein, The first condition includes one of the following: The measurement result of the downlink signal of the first cell is lower than the first threshold value; The duration during which the measurement result is below the first threshold is greater than or equal to the first duration.

22. The method according to claim 21, wherein, The first threshold value and / or the first duration are configured by the network equipment of the first cell.

23. The method according to any one of claims 18-22, wherein, The second cell includes cells in the neighbor cell list of the first cell.

24. The method according to any one of claims 18-23, wherein, The second cell is determined based on frequency priority.

25. The method according to any one of claims 18-24, wherein, The frequency of the second cell has a higher priority than the frequency of the first cell.

26. The method according to any one of claims 18-25, wherein, The first information is also used to indicate the beam information or downlink signal index information corresponding to the measurement result associated with the first information, and the beam information or downlink signal index information is used by the network device of the first cell to determine the second cell.

27. The method according to claim 26, wherein, The resources of the channel or signal carrying the first information are related to the beam information or downlink signal index information.

28. The method according to claim 26 or 27, wherein, The second information is also used to indicate the beam that transmits the discovery signal or the index information of the discovery signal; wherein the beam or the index information of the discovery signal is determined based on the beam information or the index information of the downlink signal.

29. The method according to any one of claims 18-28, wherein, The method further includes: In response to the third information from the terminal device, the network device of the first cell sends a fourth information to the network device of the third cell, and / or sends a fifth information to the network device of the second cell; The fourth information is used to trigger the network device of the third cell to send a discovery signal; the fifth information is used to trigger the network device of the second cell to increase the beam used to send the discovery signal.

30. The method according to claim 29, wherein, The third cell is determined based on one or more of the following: Frequency priority; The beam information or downlink signal index information corresponding to the measurement results associated with the first information.

31. The method according to any one of claims 18-30, wherein, The method further includes: The network equipment in the first cell configures resources for the terminal device to send a trigger signal when a third condition is met; wherein the third condition includes one or more of the following: The terminal device experienced a link failure with the first cell; The terminal device did not receive any confirmation or feedback information regarding the first information; The terminal device did not measure a detection signal that met the second condition.

32. The method according to any one of claims 18-31, wherein, The first cell includes: The primary cell that establishes an RRC connection with the terminal device; or, The cell where the terminal device is located.

33. A method for transmitting information, comprising: In response to a second message from the network device of the first cell, the network device of the second cell sends a discovery signal; wherein the discovery signal is used by the terminal device to perform cell measurement.

34. The method according to claim 33, wherein, The second information is used to indicate the beam that sent the discovery signal or the index information of the discovery signal.

35. The method according to claim 33 or 34, wherein, The method further includes: The network device of the second cell receives fifth information from the network device of the first cell; wherein the fifth information is used to trigger the network device of the second cell to increase the beam for transmitting the discovery signal.

36. The method according to any one of claims 33-35, wherein, The method further includes: In response to a trigger signal from a terminal device, the network device of the second cell sends the discovery signal.

37. A terminal device, comprising: A first communication module is configured to send first information to the network equipment of a first cell; wherein the first information is used by the first cell. The network device determines to send a second message to the network device in the second cell, the second message being used to trigger the network device in the second cell to send a discovery signal.

38. The terminal device according to claim 37, wherein, The first information includes one or more of the following: Measurement results of the downlink signal in the first cell; Information used to indicate that the measurement result meets the first condition.

39. The terminal device according to claim 37 or 38, wherein, The first communication module is further configured to: If the first condition is met, the first information is sent to the network device of the first cell.

40. The terminal device according to claim 38 or 39, wherein, The first condition includes one of the following: The measurement result of the downlink signal of the first cell is lower than the first threshold value; The duration during which the measurement result is below the first threshold is greater than or equal to the first duration.

41. The terminal device according to claim 40, wherein, The first threshold value and / or the first duration are configured by the network equipment of the first cell.

42. The terminal device according to any one of claims 37-41, wherein, The second cell includes cells in the neighbor cell list of the first cell.

43. The terminal device according to any one of claims 37-42, wherein, The second cell is determined based on frequency priority.

44. The terminal device according to any one of claims 37-43, wherein, The frequency of the second cell has a higher priority than the frequency of the first cell.

45. The terminal device according to any one of claims 37-44, wherein, The first information is also used to indicate the beam information or downlink signal index information corresponding to the measurement result associated with the first information, and the beam information or downlink signal index information is used by the network device of the first cell to determine the second cell.

46. ​​The terminal device according to claim 45, wherein, The resources of the channel or signal carrying the first information are related to the beam information or downlink signal index information.

47. The terminal device according to claim 45 or 46, wherein, The beam information or downlink signal index information is also used by the network device of the first cell to determine the beam or index information of the discovery signal sent by the network device of the second cell.

48. The terminal device according to any one of claims 37-47, wherein, The first communication module is further configured to: If no detection signal meeting the second condition is measured, the third information is sent to the network device of the first cell; Wherein, the third information is used by the network device of the first cell to determine to send the fourth information to the network device of the third cell, and / or to send the fifth information to the network device of the second cell; the fourth information is used to trigger the network device of the third cell to send a discovery signal; the fifth information is used to trigger the network device of the second cell to increase the beam for sending the discovery signal.

49. The terminal device according to claim 48, wherein, The third cell is determined based on one or more of the following: Frequency priority; The beam information or downlink signal index information corresponding to the measurement results associated with the first information.

50. The terminal device according to any one of claims 37-49, wherein, The first communication module is further configured to: If the third condition is met, a trigger signal is sent; wherein the trigger signal is used to trigger the network device that receives the trigger signal to send a discovery signal.

51. The terminal device according to claim 50, wherein, The third condition includes one or more of the following: The terminal device experienced a link failure with the first cell; The terminal device did not receive any confirmation or feedback information regarding the first information; The terminal device did not measure a detection signal that met the second condition.

52. The terminal device according to claim 50 or 51, wherein, The resources for the trigger signal are pre-configured or configured by the network equipment of the first cell.

53. The terminal device according to any one of claims 37-52, wherein, The first cell includes: The primary cell that establishes a Radio Resource Control (RRC) connection with the terminal device; or, The cell where the terminal device is located.

54. A first network device, wherein the first network device is a network device for a first cell, the first network device comprising: The second communication module is used to send second information to the network device of the second cell in response to the first information from the terminal device; wherein the second information is used to trigger the network device of the second cell to send a discovery signal.

55. The first network device according to claim 54, wherein, The first information includes one or more of the following: Measurement results of the downlink signal in the first cell; Information used to indicate that the measurement result meets the first condition.

56. The first network device according to claim 54 or 55, wherein, The first information is transmitted when the first condition is met.

57. The first network device according to claim 55 or 56, wherein, The first condition includes one of the following: The measurement result of the downlink signal of the first cell is lower than the first threshold value; The duration during which the measurement result is below the first threshold is greater than or equal to the first duration.

58. The first network device according to claim 57, wherein, The first threshold value and / or the first duration are configured by the network equipment of the first cell.

59. The first network device according to any one of claims 54-58, wherein, The second cell includes cells in the neighbor cell list of the first cell.

60. The first network device according to any one of claims 54-59, wherein, The second cell is determined based on frequency priority.

61. The first network device according to any one of claims 54-60, wherein, The frequency of the second cell has a higher priority than the frequency of the first cell.

62. The first network device according to any one of claims 54-61, wherein, The first information is also used to indicate the beam information or downlink signal index information corresponding to the measurement result associated with the first information, and the beam information or downlink signal index information is used by the network device of the first cell to determine the second cell.

63. The first network device according to claim 62, wherein, The resources of the channel or signal carrying the first information are related to the beam information or downlink signal index information.

64. The first network device according to claim 62 or 63, wherein, The second information is also used to indicate the beam that transmits the discovery signal or the index information of the discovery signal; wherein the beam or the index information of the discovery signal is determined based on the beam information or the index information of the downlink signal.

65. The first network device according to any one of claims 54-64, wherein, The second communication module is also used for: In response to the third information from the terminal device, a fourth information is sent to the network device of the third cell, and / or a fifth information is sent to the network device of the second cell; The fourth information is used to trigger the network device of the third cell to send a discovery signal; the fifth information is used to trigger the network device of the second cell to increase the beam used to send the discovery signal.

66. The first network device according to claim 65, wherein, The third cell is determined based on one or more of the following: Frequency priority; The beam information or downlink signal index information corresponding to the measurement results associated with the first information.

67. The first network device according to any one of claims 54-66, wherein, The first network device further includes a first processing module, which is used to: Configure the terminal device with resources for sending a trigger signal when a third condition is met; wherein the third condition includes one or more of the following: The terminal device experienced a link failure with the first cell; The terminal device did not receive any confirmation or feedback information regarding the first information; The terminal device did not measure a detection signal that met the second condition.

68. The first network device according to any one of claims 54-67, wherein, The first cell includes: The primary cell that establishes an RRC connection with the terminal device; or, The cell where the terminal device is located.

69. A second network device, the second network device being a network device for a second cell, the second network device comprising: The third communication module is used to send a discovery signal in response to second information from the network device of the first cell; wherein the discovery signal is used by the terminal device to perform cell measurement.

70. The second network device according to claim 69, wherein, The second information is used to indicate the beam that sent the discovery signal or the index information of the discovery signal.

71. The second network device according to claim 69 or 70, wherein, The third communication module is also used for: The network device of the first cell receives a fifth message; wherein the fifth message is used to trigger the network device of the second cell to increase the beam for transmitting the discovery signal.

72. The second network device according to any one of claims 69-71, wherein, The third communication module is also used for: The discovery signal is sent in response to a trigger signal from the terminal device.

73. A terminal device, comprising: A transceiver, a processor, and a memory, wherein the memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to invoke the computer program stored in the memory to cause the terminal device to perform the method as described in any one of claims 1 to 17.

74. A first network device, comprising: A transceiver, a processor, and a memory, wherein the memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to invoke the computer program stored in the memory to cause the first network device to perform the method as described in any one of claims 18 to 32.

75. A second network device, comprising: A transceiver, a processor, and a memory, wherein the memory is used to store a computer program, the transceiver is used to communicate with other devices, and the processor is used to invoke the computer program stored in the memory to cause the second network device to perform the method as described in any one of claims 33 to 36.

76. A chip, comprising: A processor for retrieving and running a computer program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1 to 17.

77. A chip, comprising: A processor for retrieving and running a computer program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 18 to 32.

78. A chip, comprising: A processor for retrieving and running a computer program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 33 to 36.

79. A computer-readable storage medium for storing a computer program that, when run by a device, causes the device to perform the method as claimed in any one of claims 1 to 17.

80. A computer-readable storage medium for storing a computer program that, when run by a device, causes the device to perform the method as described in any one of claims 18 to 32.

81. A computer-readable storage medium for storing a computer program that, when run by a device, causes the device to perform the method as described in any one of claims 33 to 36.

82. A computer program product comprising computer program instructions that cause a computer to perform the method as claimed in any one of claims 1 to 17.

83. A computer program product comprising computer program instructions that cause a computer to perform the method as described in any one of claims 18 to 32.

84. A computer program product comprising computer program instructions that cause a computer to perform the method as described in any one of claims 33 to 36.

85. A computer program that causes a computer to perform the method as claimed in any one of claims 1 to 17.

86. A computer program that causes a computer to perform the method as described in any one of claims 18 to 32.

87. A computer program that causes a computer to perform the method as described in any one of claims 33 to 36.

88. A communication system, comprising a terminal device, a first network device, and a second network device; wherein, The terminal device is used to perform the method as described in any one of claims 1 to 17; The first network device includes network devices for a first cell, configured to perform the method as described in any one of claims 18 to 32; The second network device includes the network device of the second cell, for performing the method as described in any one of claims 33 to 36.

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