Communication method and apparatus

Abstract

The present application provides a communication method and apparatus, which can be applied to the field of communications. The method comprises: a terminal device receives first configuration information from a first access network device, the first configuration information comprising at least one of a prediction quantity, a starting condition for predicting the prediction quantity, at least one time period for predicting the prediction quantity, a trigger condition for the prediction quantity, or a trigger condition for handover, and the prediction quantity comprising one of the following abnormal events: an RLF in a serving cell, an HOF in at least one neighboring cell, an RLF in the at least one neighboring cell, a ping-pong handover in the at least one neighboring cell, or an unnecessary handover in the at least one neighboring cell; and the terminal device predicts a first prediction result on the basis of the first configuration information. In the solution, a target cell can be determined on the basis of a first prediction result, so that the probability of occurrence of an abnormal event can be reduced during mobility management, thereby improving user experience and network performance.

Description

Communication method and device

[0001] This application claims priority to the Chinese patent application filed with the Intellectual Property Office of the People's Republic of China on November 30, 2023, with application number 202311637331.1 and invention name "Communication Method and Apparatus", the entire contents of which are incorporated by reference into this application. Technical Field

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

[0003] Mobility management enables terminal devices to move within the network coverage area and enjoy uninterrupted service by changing their serving cell. Mobility management of terminal devices in the radio resource control (RRC) connected state is called handover, while mobility management of terminal devices in the RRC idle or RRC inactive state is called cell reselection.

[0004] During the handover process, the target cell can be determined based on the measurement results. In the basic handover process, the terminal device evaluates that the reporting conditions for the measurement report are met and reports the measurement report to the network side; the network side makes a handover decision based on the measurement report reported by the terminal device to determine the target cell, and requests access to the target cell from the target base station to which the target cell belongs; the target base station performs access control, allowing the terminal device to access the target cell and allocates wireless resources to the terminal device; the network side includes the configuration information of the target cell returned by the target base station in the handover command and sends it to the terminal device, and the terminal device accesses the target cell according to the handover command. In the conditional handover process, the network side sends a handover command to the terminal device in advance. The handover command includes the configuration information of one or more candidate cells and the triggering conditions for handover execution. The terminal device determines the target cell based on whether the measurement results of the candidate cells meet the triggering conditions for handover execution.

[0005] The current solution for determining the target cell based on measurement results cannot avoid radio link failure (RLF) in the serving cell before the handover is executed, nor can it guarantee that the terminal device successfully accesses the target cell / cannot guarantee that there will be no handover failure during the handover process, and it cannot guarantee that after successfully accessing the target cell, there will be no abnormal events such as RLF, ping-pong handover, or unnecessary handover.

[0006] Summary of the Invention

[0007] The present application provides a communication method and apparatus that can reduce the probability of abnormal events occurring during mobility management, thereby improving user experience and network performance.

[0008] In a first aspect, a communication method is provided, which can be executed by a terminal device or a chip or chip system in the terminal device. The method includes: the terminal device receives first configuration information from a first access network device, the first configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, and the predicted quantity includes one of the following abnormal events: a radio link failure RLF in a serving cell, a handover failure HOF in at least one neighboring cell, an RLF in the at least one neighboring cell, a ping-pong handover in the at least one neighboring cell, or an unnecessary handover in the at least one neighboring cell; the terminal device predicts a first prediction result based on the first configuration information.

[0009] Based on the above technical solution, the terminal device can predict a first prediction result (whether an abnormal event will occur in at least one time period in the future or the probability of an abnormal event occurring or the probability of non-occurrence of an abnormal event, or the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to at least one first candidate cell, or the identifier of at least one second candidate cell that meets the trigger condition of switching and the time period that meets the trigger condition of switching corresponding to at least one second candidate cell) according to the first configuration information from the first access network device; the target cell for switching can be determined according to the first prediction result, which can reduce the probability of occurrence of abnormal events in the mobility management process, thereby improving the success rate of switching, user experience and network performance.

[0010] In conjunction with the first aspect, in certain implementations of the first aspect, the method further includes: the terminal device sending the first prediction result to the first access network device; the terminal device receiving a handover command from the first access network device, the handover command instructing handover to a target cell during a target time period, the at least one neighboring cell including the target cell, and the at least one time period including the target time period; and the terminal device handing over from the serving cell to the target cell during the target time period according to the handover command. This implementation is applicable to a basic handover process.

[0011] In conjunction with the first aspect, in certain implementations of the first aspect, the method further includes: the terminal device determining, based on the first prediction result, a target cell that satisfies the trigger condition of the predicted quantity and a target time period corresponding to the target cell that satisfies the trigger condition of the predicted quantity; or determining a target cell that satisfies the trigger condition of the handover and a target time period corresponding to the target cell that satisfies the trigger condition of the handover; and the terminal device switching from the serving cell to the target cell during the target time period. This implementation is applicable to a conditional handover process.

[0012] In combination with the first aspect, in certain implementations of the first aspect, the first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching corresponding to the at least one second candidate cell, wherein the at least one neighboring cell includes the at least one first candidate cell.

[0013] Exemplarily, the first configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, and at least one time period for predicting the predicted quantity, and the first prediction result includes whether an abnormal event occurs, or the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event in at least one time period in the serving cell and / or at least one neighboring cell.

[0014] Exemplarily, the first configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, at least one time period for predicting the predicted quantity, and the triggering conditions for the predicted quantity. The first prediction result includes the identifier of at least one first candidate cell that meets the triggering conditions of the predicted quantity and the time period that meets the triggering conditions of the predicted quantity corresponding to at least one first candidate cell.

[0015] Exemplarily, the first configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, at least one time period for predicting the predicted quantity, the triggering conditions for the predicted quantity, and the triggering conditions for switching. The first prediction result includes the identifier of at least one second candidate cell that meets the triggering conditions for switching and the time period that meets the triggering conditions for switching corresponding to at least one second candidate cell.

[0016] In combination with the first aspect, in certain implementations of the first aspect, the starting conditions for predicting the predicted quantity include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

[0017] In combination with the first aspect, in certain implementations of the first aspect, the triggering conditions of the predicted quantity include: the abnormal event does not occur, or the probability of occurrence of the abnormal event is less than or equal to a first threshold, or the probability of non-occurrence of the abnormal event is greater than or equal to a second threshold.

[0018] In combination with the first aspect, in certain implementations of the first aspect, the triggering condition for the switching includes: a combination of the triggering conditions that satisfy the predicted quantities corresponding to one or more of the predicted quantities, or the weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or the weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

[0019] In a second aspect, a communication method is provided, which can be executed by a first access network device or a chip or chip system in the first access network device. The method includes: the first access network device sends first configuration information to the terminal device, the first configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, the predicted quantity includes one of the following abnormal events: RLF in the serving cell, HOF in at least one neighboring cell, RLF in the at least one neighboring cell, ping-pong switching in the at least one neighboring cell, or unnecessary switching in the at least one neighboring cell; the first access network device receives a first prediction result from the terminal device, the first prediction result is predicted based on the first configuration information; the first access network device sends a switching command to the terminal device based on the first prediction result, the switching command instructing switching to the target cell in the target time period.

[0020] The method provided in the second aspect is a method on the first access network device side corresponding to the first aspect, and its beneficial effects can refer to the first aspect.

[0021] In combination with the second aspect, in certain implementations of the second aspect, sending a switching command to the terminal device based on the first prediction result includes: sending a switching request message to the second access network device, the switching request message including part or all of the first prediction result, wherein part or all of the first prediction result may include at least one of the following: at least one predicted target cell, at least one time period corresponding to the predicted target cell, and a predicted probability of at least one abnormal event occurring or not occurring within the time period corresponding to the target cell; receiving a switching request confirmation message from the second access network device; sending the switching command to the terminal device, the switching command including indication information for instructing switching to the target cell within the target time period;.

[0022] In combination with the second aspect, in certain implementations of the second aspect, the first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

[0023] In combination with the second aspect, in certain implementations of the second aspect, the starting conditions for predicting the predicted quantity include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

[0024] In combination with the second aspect, in certain implementations of the second aspect, the triggering conditions of the predicted quantity include: the abnormal event does not occur, or the probability of occurrence of the abnormal event is less than or equal to a first threshold, or the probability of non-occurrence of the abnormal event is greater than or equal to a second threshold.

[0025] In combination with the second aspect, in certain implementations of the second aspect, the triggering condition for the switching includes: a combination of the triggering conditions that satisfy the predicted quantities corresponding to one or more of the predicted quantities, or the weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or the weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

[0026] In a third aspect, a communication method is provided, which can be executed by a terminal device or a chip or chip system in the terminal device. The method includes: the terminal device receives second configuration information from a first access network device, the second configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for cell reselection, and the predicted quantity includes one of the following abnormal events: failure to establish a radio resource control RRC connection in a serving cell, failure to recover an RRC connection in the serving cell, RLF after establishing an RRC connection with the serving cell, failure to establish an RRC connection in at least one neighboring cell, failure to recover an RRC connection in at least one neighboring cell, or RLF after establishing an RRC connection with the at least one neighboring cell; the terminal device predicts a second prediction result based on the second configuration information.

[0027] Based on the above technical solution, the terminal device can predict the second prediction result (whether an abnormal event will occur in at least one time period in the future or the probability of an abnormal event occurring or the probability of non-occurrence of an abnormal event, or the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to at least one first candidate cell, or the identifier of at least one second candidate cell that meets the trigger condition of cell reselection and the time period that meets the trigger condition of cell reselection corresponding to at least one second candidate cell) according to the second configuration information from the second access network device; according to the second prediction result, the target cell for cell reselection can be determined, which can reduce the probability of occurrence of abnormal events in the mobility management process, thereby improving the success rate of RRC connection establishment / RRC connection recovery, user experience and network performance.

[0028] In combination with the third aspect, in certain implementations of the third aspect, the method further includes: the terminal device determines, based on the second prediction result, a target cell that meets the trigger conditions of the predicted quantity and a target time period corresponding to the target cell that meets the trigger conditions of the predicted quantity; or, determines a target cell that meets the trigger conditions for cell reselection and a target time period corresponding to the target cell that meets the trigger conditions for cell reselection; and the terminal device reselects from the serving cell to the target cell during the target time period.

[0029] In combination with the third aspect, in certain implementations of the third aspect, the second prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the cell reselection and the time period that meets the trigger condition of the cell reselection corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

[0030] Exemplarily, the second configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, and at least one time period for predicting the predicted quantity, and the second prediction result includes whether the abnormal event occurs or the probability of the abnormal event occurring or the probability of the abnormal event not occurring in at least one time period of the serving cell and / or at least one neighboring cell.

[0031] Exemplarily, the second configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, at least one time period for predicting the predicted quantity, and the triggering conditions for the predicted quantity, and the second prediction result includes the identifier of at least one first candidate cell that meets the triggering conditions of the predicted quantity and the time period that meets the triggering conditions of the predicted quantity corresponding to at least one first candidate cell.

[0032] Exemplarily, the second configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, at least one time period for predicting the predicted quantity, the triggering conditions for the predicted quantity, and the triggering conditions for cell reselection, and the second prediction result includes the identifier of at least one second candidate cell that meets the triggering conditions for cell reselection and the time period corresponding to at least one second candidate cell that meets the triggering conditions for cell reselection.

[0033] In combination with the third aspect, in certain implementations of the third aspect, the starting conditions for predicting the predicted amount include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

[0034] In combination with the third aspect, in certain implementations of the third aspect, the triggering conditions of the predicted quantity include: the abnormal event does not occur, or the probability of occurrence of the abnormal event is less than or equal to a first threshold, or the probability of non-occurrence of the abnormal event is greater than or equal to a second threshold.

[0035] In combination with the third aspect, in certain implementations of the third aspect, the triggering conditions for cell reselection include: a combination of the triggering conditions that satisfy the predicted quantities corresponding to one or more of the predicted quantities, or a weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or a weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold, or the weighted sum of the occurrence probabilities or non-occurrence probabilities corresponding to multiple of the predicted quantities is considered when calculating the R criterion / S criterion for cell reselection.

[0036] In a fourth aspect, a communication method is provided, which can be executed by a first access network device or a chip or chip system in the first access network device. The method includes: the first access network device sends second configuration information to the terminal device, the second configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for cell reselection, and the predicted quantity includes one of the following abnormal events: failure to establish an RRC connection in the serving cell, failure to recover the RRC connection in the serving cell, RLF after establishing an RRC connection with the serving cell, failure to establish an RRC connection in at least one neighboring cell, failure to recover the RRC connection in at least one neighboring cell, or RLF after establishing an RRC connection with the at least one neighboring cell.

[0037] The method provided in the fourth aspect is a method on the first access network device side corresponding to the third aspect, and its beneficial effects can refer to the third aspect.

[0038] In the fifth aspect, a communication device is provided, which can be applied to the terminal device described in the first aspect. The device includes: a transceiver unit for implementing the receiving function and the sending function of the method described in the first aspect; a processing unit for implementing the prediction function of the method described in the first aspect, etc.

[0039] In a sixth aspect, a communication device is provided, which can be applied to the first access network device described in the second aspect. The device includes: a transceiver unit, which is used to implement the receiving function and the sending function of the method described in the second aspect.

[0040] In the seventh aspect, a communication device is provided, which can be applied to the terminal equipment described in the third aspect. The device includes: a transceiver unit for implementing the receiving function and the sending function of the method described in the third aspect; a processing unit for implementing the prediction function of the method described in the third aspect, etc.

[0041] In an eighth aspect, a communication device is provided, which can be applied to the first access network device described in the fourth aspect. The device includes: a transceiver unit, which is used to implement the receiving function and the sending function of the method described in the fourth aspect.

[0042] In the ninth aspect, a communication device is provided, comprising: a processor and a memory, wherein the memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory, so that the communication device executes the method in any possible implementation of the above-mentioned first to fourth aspects or the first to fourth aspects.

[0043] In the tenth aspect, a communication device is provided, comprising: an input and output interface and a logic circuit, wherein the input and output interface is used to obtain input information and / or output information; the logic circuit is used to execute the method described in the first to fourth aspects or any possible implementation method of the first to fourth aspects above, and process and / or generate output information based on the input information.

[0044] In the eleventh aspect, a communication system is provided, comprising: a terminal device and a first access network device, wherein the terminal device is used to implement the method of the above-mentioned first aspect (third aspect) or any possible implementation of the first aspect (third aspect), and the first access network device is used to implement the method of the above-mentioned second aspect (fourth aspect) or any possible implementation of the second aspect (fourth aspect).

[0045] In the twelfth aspect, a computer-readable storage medium is provided, wherein the computer-readable medium stores a computer program; when the computer program runs on a computer, the computer executes the method in any possible implementation of the above-mentioned first to fourth aspects or the first to fourth aspects.

[0046] In the thirteenth aspect, a computer program product comprising instructions is provided, wherein when the instructions are executed by a computer, the communication device implements the method in any possible implementation of the above-mentioned first to fourth aspects or the first to fourth aspects.

[0047] The solutions provided in the above-mentioned fifth to thirteenth aspects are used to implement or cooperate with the methods provided in the above-mentioned first, second, third or fourth aspects, and therefore can achieve the same or corresponding beneficial effects as the first, second, third or fourth aspects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic diagram of the architecture of a communication system to which an embodiment of the present application is applicable.

[0049] Figure 2 is a schematic diagram of the CU-DU architecture.

[0050] FIG3 is a schematic diagram of access network equipment in an ORAN system.

[0051] Figure 4 is a schematic diagram of the framework for applying AI / ML in NR.

[0052] FIG5 is a schematic diagram of an abnormal event occurring during a measurement-based handover process.

[0053] FIG6 is a schematic diagram of an abnormal event occurring during measurement-based cell reselection.

[0054] FIG7 is a schematic flow diagram of a communication method provided in an embodiment of the present application.

[0055] FIG8 is a schematic flow diagram of another communication method provided in an embodiment of the present application.

[0056] FIG9 is a schematic block diagram of a communication device according to an embodiment of the present application.

[0057] FIG10 is a schematic block diagram of another communication device according to an embodiment of the present application.

[0058] FIG11 is a schematic block diagram of another communication device according to an embodiment of the present application.

[0059] FIG12 is a schematic block diagram of another communication device according to an embodiment of the present application.

[0060] FIG13 is a schematic block diagram of another communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0061] The technical solution in this application will be described below with reference to the accompanying drawings.

[0062] The embodiments of the present application can be applied to various communication systems, such as wireless local area network (WLAN), narrowband Internet of Things (NB-IoT), global system for mobile communications (GSM), enhanced data rate for GSM evolution (EDGE), wideband code division multiple access (WCDMA), code division multiple access 2000 (CDMA2000), time division-synchronization code division multiple access (TD-SCDMA), LTE, satellite communication, 5G communication system, sixth-generation (6G) communication system or new communication systems that will appear in the future.

[0063] FIG1 is a schematic diagram of the architecture of a communication system applicable to an embodiment of the present application. The communication system includes a radio access network (RAN) 100 and a core network (CN) 200. The RAN 100 includes at least one RAN node (such as 110a and 110b in FIG1 , collectively referred to as 110) and at least one terminal (such as 120a-120j in FIG1 , collectively referred to as 120). The RAN may also include other RAN nodes, such as wireless relay equipment and / or wireless backhaul equipment (not shown in FIG1 ). The terminal 120 is connected to the RAN node 110 wirelessly. The RAN node 110 is connected to the core network 200 wirelessly or by wire. The core network equipment in the core network 200 and the RAN node 110 in the RAN 100 can be different physical devices, or they can be the same physical device that integrates the core network logical functions and the radio access network logical functions.

[0064] The RAN 100 may be a cellular system related to the Third Generation Partnership Project (3GPP), such as a 4G or 5G mobile communication system, a non-terrestrial network (NTN) system, or a future-oriented evolution system (such as a 6G mobile communication system). The RAN 100 may also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system, or a communication system that integrates two or more of the above systems.

[0065] The terminal 120 involved in the embodiments of the present application may also be referred to as a terminal device, user equipment (UE), mobile station, mobile terminal, etc. The terminal can be widely used in various scenarios, for example, device-to-device (D2D), vehicle-to-everything (V2X) communication, machine-type communication (MTC), Internet of Things (IOT), virtual reality, augmented reality, industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city, etc. The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a wearable device, a vehicle, a drone, a helicopter, an airplane, a ship, a robot, a robotic arm, a smart home device, etc. The embodiments of the present application do not limit the device form of the terminal.

[0066] The RAN node 110 involved in the embodiments of the present application may also sometimes be referred to as an access network device, a RAN entity, or an access node, etc., and constitutes a part of a communication system to facilitate wireless access for terminals. The multiple RAN nodes 110 in the communication system 1000 may be nodes of the same type or different types. In some scenarios, the roles of the RAN node 110 and the terminal 120 are relative. For example, the network element 120i in Figure 1 may be a helicopter or a drone, which may be configured as a mobile base station. For the terminal 120j that accesses the RAN 100 through the network element 120i, the network element 120i is a base station; however, for the base station 110a, the network element 120i is a terminal. The RAN node 110 and the terminal 120 are sometimes referred to as communication devices. For example, the network elements 110a and 110b in Figure 1 may be understood as communication devices with base station functions, and the network elements 120a-120j may be understood as communication devices with terminal functions.

[0067] In one possible scenario, a RAN node may be a base station, an evolved NodeB (eNodeB), an access point (AP), a transmission reception point (TRP), a next-generation NodeB (gNB), a next-generation base station in a 6G communication system, a base station in a future mobile communication system, or an access node in a WiFi system. A RAN node may be a macro base station (such as 110a in Figure 1 ), a micro base station or an indoor station (such as 110b in Figure 1 ), a relay node or a donor node, or a wireless controller in a CRAN scenario. Optionally, a RAN node may also be a server, a wearable device, a vehicle, or an onboard device. For example, the access network device in vehicle-to-everything (V2X) technology may be a roadside unit (RSU).

[0068] In another possible scenario, multiple RAN nodes collaborate to assist terminals in achieving wireless access, with different RAN nodes implementing portions of the base station's functionality. For example, a RAN node can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be separate or included in the same network element, such as the baseband unit (BBU). The CU and DU nodes split the gNB's protocol layers, centrally controlling some protocol layer functions within the CU and distributing some or all of the remaining protocol layer functions within the DU, which is then centrally controlled by the CU. As an implementation method, the CU is deployed with the RRC layer, the packet data convergence protocol (PDCP) layer, and the service data adaptation protocol (SDAP) layer in the protocol stack; the DU is deployed with the radio link control (RLC) layer, the media access control (MAC) layer, and the physical layer (PHY) in the protocol stack. Thus, the CU has the processing capabilities of RRC, PDCP, and SDAP. The DU has the processing capabilities of RLC, MAC, and PHY. It will be understood that the above functional division is only an example and does not constitute a limitation on the CU and DU. The RU may be included in a radio frequency device or a radio frequency unit, for example, in a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH).

[0069] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0070] The core network equipment involved in the embodiments of the present application refers to the equipment in the core network (CN) that provides service support for the terminal. At present, some examples of core network equipment are: access and mobility management function (AMF) entity, session management function (SMF) entity, user plane function (UPF) entity, etc., which are not listed here one by one. Among them, the AMF entity can be responsible for the access management and mobility management of the terminal; the SMF entity can be responsible for session management, such as user session establishment, etc.; the UPF entity can be a functional entity of the user plane, mainly responsible for connecting to the external network. It should be noted that the entities in this application can also be referred to as network elements or functional entities. For example, the AMF entity can also be referred to as an AMF network element or an AMF functional entity. For another example, the SMF entity can also be referred to as an SMF network element or an SMF functional entity, etc.

[0071] Figure 2 shows the CU-DU architecture. The CU and DU are connected via the F1 interface. The CU, representing the gNB, is connected to the core network via the Ng interface.

[0072] Figure 3 is a schematic diagram of an access network device in an ORAN system. The access network device includes one or more CUs, DUs, and RUs.

[0073] The correspondence between the access network devices (network element modules) in the ORAN system and the protocol layer functions they can implement can be found in Table 1.

[0074] Table 1

[0075] To facilitate understanding of the embodiments of the present application, the following briefly introduces the technical solutions related to the embodiments of the present application.

[0076] 1. Artificial intelligence (AI) / machine learning (ML)

[0077] Artificial intelligence uses computers to simulate and extend human consciousness, thought processes, and intelligent behaviors (such as learning, reasoning, thinking, and planning), enabling computers to achieve higher-level applications. Machine learning involves extracting recognizable features from a set of raw data, then learning from these features to ultimately generate a model. Currently, there are proposals to apply AI / ML to new radio (NR) networks, using intelligent data collection and analysis to improve network performance and user experience. Figure 4 illustrates the framework for applying AI / ML in NR.

[0078] The data collection function stores measurements from various network entities, including gNBs, gNB-CUs, gNB-DUs, operations administration and maintenance (OAM) elements, and terminal devices, as well as feedback from actors. This data provides data for the model training and model inference functions. This data may require data preparation, such as preprocessing, cleaning, formatting, and conversion. The model training function performs AI / ML model training, model validation, and model testing on the data provided by the data collection function. Model testing may generate model performance metrics. The model training function provides an initial or updated AI / ML model to the model inference function through the model application / update mechanism. The model inference function uses the AI / ML model to provide model inference outputs, such as predictions or decisions, based on the data provided by the data collection function. These outputs are used to guide network policy adjustments and provide model performance feedback to the model training function. Actors receive the outputs from the model inference function and are responsible for executing relevant policy adjustments. Actors can be the network entities listed above or a single entity. At the same time, after applying the relevant strategies, the specific performance of the network, such as various performance parameters, will be input into the data collection function again to evaluate the performance of training data, inference data or AI / ML models and their related impacts.

[0079] Artificial intelligence systems have various applications and functions in NR, such as energy saving, load balancing, and mobility parameter optimization.

[0080] 2. Traditional handover, conditional handover (CHO), dual active protocol stack (DAPS) handover, and multi-radio dual connectivity (MR-DC)

[0081] 1. Traditional switching

[0082] In the traditional handover process of mobile communication systems, the mobility management of connected terminal devices is controlled by network equipment. The source base station sends an RRC reconfiguration message including a handover command to instruct the terminal device which target cell to switch to and how to perform the handover. Specifically, upon receiving the RRC reconfiguration message including the handover command, the terminal device immediately releases the source cell, stops uplink / downlink data transmission with the source cell, and accesses the target cell according to the content of the handover command. Therefore, the successful transmission of the handover command is a necessary condition for ensuring a successful handover under the traditional handover mechanism.

[0083] 2. Conditional switching

[0084] The existing technology proposes a conditional switching mechanism to improve the success rate of switching. Specifically, when the quality of the source link is good, the source base station sends an RRC reconfiguration message including CHO configuration information to the terminal device. The CHO configuration information may include the configuration information of one or more candidate cells, execution trigger conditions, measurement configuration, etc.; after receiving the CHO configuration information, the terminal device will not immediately initiate a switching action to any candidate cell, but will continue to maintain connection and data transmission with the source base station. After the terminal device finds a candidate cell that meets the execution trigger conditions among the candidate cells, it can independently determine the target cell and perform the switching. Under the traditional NR switching, after receiving the switching command, the terminal device will immediately perform the switching to the target cell indicated by the switching command.

[0085] 3. DAPS switching

[0086] The prior art proposes a DAPS switching mechanism to reduce the switching interruption time. The switching interruption time can be understood as the period of time during which the terminal device cannot transmit data with any base station during the switching. Specifically, the source base station indicates the target cell to the terminal device through an RRC reconfiguration message including a switching command, and the terminal device accesses the target cell according to the content included in the switching command. The difference from the traditional NR switching is that during the execution of the DAPS switching (during access to the target cell), the terminal device will continue to transmit data with the source cell until the terminal device establishes a connection with the target cell and transmits data. Specifically, the terminal device can receive data from the source cell and the target cell at the same time in a short period of time, and can also send data to the source cell and the target cell at the same time:

[0087] The terminal device continues to receive downlink data from the source cell until the target cell instructs the terminal device to release the source cell; or,

[0088] The terminal device continues to send uplink data to the source cell until it successfully randomly accesses the target cell.

[0089] DAPS handover places high demands on terminal device capabilities. From the terminal device's perspective, two protocol stacks are internally activated during the DAPS handover process. One active protocol stack is used for transmitting and receiving user-plane data in the target cell; the other is used for transmitting and receiving user-plane data in the source cell. The source and target user-plane protocol stacks use a common PDCP entity, enabling both sides to share common reordering and deduplication functions.

[0090] 4. Multi-port dual connection

[0091] In a wireless network, a terminal device may communicate with multiple base stations, which is called dual-connectivity (DC), also known as multi-air interface dual connectivity MR-DC. These multiple base stations may be base stations belonging to the same radio access technology (RAT) (for example, all 4G base stations, or all 5G base stations), or they may be base stations belonging to different RATs (for example, one is a 4G base station and the other is a 5G base station). The network side can use the resources of multiple base stations to provide communication services for the terminal device, thereby providing high-speed transmission for the terminal device. The base station in DC that has control plane signaling interaction with the core network is called the master node (MN), and the other base stations are called secondary nodes (SN). In MR-DC, there is a primary cell (Pcell) in the master base station and a primary secondary cell (PSCell) in the secondary base station. The primary cell refers to the cell deployed at the primary frequency point, and the terminal device indicates it as the primary cell during the initial connection establishment process or connection re-establishment process initiated by the cell, or during the handover process. The primary and secondary cells refer to the cells where the terminal device initiates a random access process in the secondary base station, or the cells where the terminal device skips the random access process to initiate data transmission during the secondary base station change process, or the cells of the secondary base station where the terminal device initiates random access during the synchronization reconfiguration process.

[0092] Traditional addition / change of primary and secondary cells: When the terminal device is single-connected (PSCell is not configured), the network side will trigger the addition of PSCell. The network side directly indicates a target PSCell cell to the terminal device, and the terminal device adds the target PSCell cell. The network side configures MR-DC for the terminal device, and the addition of PSCell can only be triggered by MN; when the terminal device is configured with PSCell, due to the mobility of the terminal device, the network side will trigger the change of PSCell, which can be MN triggered or SN triggered. The network side directly indicates a target PSCell cell to the terminal device, and the terminal device switches from the current PSCell to the target PSCell.

[0093] The CHO mechanism is combined with the addition / change scenario of primary and secondary cells, and a conditional primary and secondary cell addition / change mechanism (CPAC) is introduced. The corresponding trigger node (MN / SN) will prepare multiple candidate PSCell cells in advance. The network side sends the CPAC configuration information to the terminal device. The CPAC configuration information includes candidate cell information, measurement configuration and switching trigger conditions. The candidate cell information may include the identification information of the candidate PSCell cell and the configuration parameter information of the candidate PSCell cell; wherein the cell identification information may be a global cell identifier (CGI) or a physical cell identifier (PCI) and frequency information. After the terminal device receives the CAPC configuration information, if it finds that the signal quality of a candidate cell meets the switching trigger condition, it will use the candidate cell as the target cell and access it, executing the PSCell addition or change process.

[0094] 3. Mobility Management

[0095] Mobility management changes the serving cell of a terminal device, allowing the terminal device to move within the network coverage area and enjoy uninterrupted service. Mobility management is based on the RRC state of the terminal device. Mobility management in different RRC states is divided into:

[0096] Mobility management in RRC connected state: handover;

[0097] Mobility management in RRC idle state: cell reselection;

[0098] Mobility management in RRC inactive state: cell reselection.

[0099] In the RRC connected state, the terminal device and the base station have established an RRC connection. In the RRC idle state, the terminal device and the base station have not established an RRC connection. In the RRC inactive state, the terminal device suspends data processing, but the base station still maintains the context information of the terminal device. In simple terms, the air interface state of the terminal device in the RRC inactive state is similar to that in the RRC idle state, but from the core network side, the terminal device in the RRC inactive state is still in the connection management (CM) connection state.

[0100] 4. Measurement-based switching mechanism

[0101] Mobility management in the RRC connected state is called handover, which includes primary cell handover and addition / change of primary and secondary cells. During the handover process, the target cell can be determined based on the measurement report of the terminal device, or it can be determined not based on the measurement report of the terminal device. The handover mechanism not based on the measurement report of the terminal device is generally not adopted due to the high risk of access failure caused by the uncertainty of the target cell signal quality. Therefore, only the measurement-based handover mechanism is discussed. The method of executing handover to access the target cell can be based on random access, or random access can be skipped (free) for uplink / downlink data transmission.

[0102] In the basic switching process (including traditional switching, DAPS, and addition / change of primary and secondary cells), the terminal device evaluates that the reporting conditions of the measurement report are met and reports the measurement report to the network side; the network side makes a switching decision based on the measurement report reported by the terminal device to determine the target cell, and requests access to the target base station to which the target cell belongs; the target base station performs admission control, allows the terminal device to access the target cell and allocates wireless resources (configuration information of the target cell) to the terminal device; the network side includes the configuration information of the target cell returned by the target base station in the switching command and sends it to the terminal device, and the terminal device accesses the target cell according to the switching command.

[0103] In the conditional handover process (including CHO and CPAC), the network side sends a handover command to the terminal device in advance. The handover command includes the configuration information of one or more candidate cells and the triggering conditions for handover execution. The terminal device determines the target cell based on whether the measurement results of the candidate cells meet the triggering conditions for handover execution. After the terminal device evaluates whether the measurement results meet the entry threshold of a certain measurement event and lasts for a period of time / delay time (time to trigger, TTT), it determines that the triggering conditions are met. The triggering conditions correspond to the reporting conditions of the above-mentioned measurement report or the triggering conditions for handover execution of the candidate cell; wherein TTT represents the duration of time that the event entry conditions are continuously met.

[0104] The meaning of each measurement event can be found in Table 2.

[0105] Table 2

[0106] Among them, Ms and Mn represent the measurement results of the signal quality corresponding to the serving cell and the neighboring cell respectively; Hys represents the amplitude hysteresis of the measurement result; Thresh, Thresh1, and Thresh2 represent the threshold values; Ofs and Ofn represent the frequency offsets of the serving cell and the neighboring cell respectively; Ocs and Ocn represent the cell offsets of the serving cell and the neighboring cell respectively; Off represents the offset of the measurement result.

[0107] Signal quality can be characterized by reference signal receiving power (RSRP), received signal strength indication (RSSI), reference signal receiving quality (RSRQ), or signal to interference plus noise ratio (SINR). RSRP reflects the received strength of the reference signal; RSSI reflects the total signal strength of the current channel; RSRQ reflects the signal-to-noise ratio and interference level of the current channel quality, which is approximately the ratio of RSRP to RSSI; and SINR reflects the signal-to-interference ratio of the current channel and is an important indicator for measuring the performance of terminal devices.

[0108] 5. Abnormal events in RRC connected state

[0109] In order to reduce the problems of premature switching, late switching / radio link failure of the source cell, switching to the wrong cell, unnecessary handover, and ping-pong switching in intra-frequency switching, inter-frequency switching, inter-system switching, etc. caused by unreasonable network parameter settings, the system currently supports the mobility robustness optimization (MRO) mechanism. MRO is an important mechanism for network self-optimization. It will perform autonomous analysis and optimize network parameters based on the reports reported by the terminal device to the network side and the reports sent by the network device. Specifically, when a mobility abnormality event occurs in the terminal device (such as wireless link failure or handover failure, etc.), the abnormal parameters related to mobility are reported to the network device, and the network device can adjust the mobility parameters according to the information reported by the terminal device; in addition, when the network device detects that a mobility abnormality event occurs in the terminal device (such as unnecessary handover or ping-pong handover), it will send relevant information to other network devices so that other network devices can decide whether to adjust the parameters and / or how to adjust the parameters, such as the parameters that trigger the handover. Mobility abnormality events include but are not limited to the following:

[0110] Premature handover: RLF occurs shortly after a successful handover from the source cell to the target cell, or a handover failure (HOF) occurs during the handover process, and the terminal device attempts to reestablish the radio link connection in the source cell;

[0111] Late handover: After the terminal device stays in the source cell for a long time, an RLF occurs and the terminal device attempts to reestablish the radio link connection in a different cell.

[0112] Handover to wrong cell: RLF occurs shortly after a successful handover from the source cell to the target cell, or the handover fails during the handover process, and the terminal device attempts to reestablish the radio link connection in a cell other than the source cell and the target cell;

[0113] Unnecessary handover: Even if the service quality within the NR coverage area is sufficient to meet the service requirements of the terminal device, the terminal device may switch from the NR system to the evolved universal terrestrial radio access network (E-UTRAN) system or the evolved packet system (EPS). Therefore, the handover may be considered unnecessary (also known as unnecessary inter-system handover or premature inter-system handover without connection failure). Alternatively, the terminal device switches from the source cell to the target cell if the service quality within the coverage area of ​​the source cell is sufficient to meet the service requirements of the terminal device.

[0114] Ping-pong switching: The terminal device switches from a cell of a source system (such as a 5G system) to a cell in a target system that is different from the source system (such as EPS), and then switches back to the cell in the source system within a predefined limited time, and the service quality within the coverage area of ​​the source system is sufficient to meet the business needs of the terminal device; or, the terminal device switches from the source cell to the target cell, and within a predefined limited time, the terminal device switches back to the source cell, and the service quality within the coverage area of ​​the source cell is sufficient to meet the business needs of the terminal device.

[0115] 6. Measurement-based cell reselection mechanism

[0116] Handover is a process in which the terminal device is in the RRC connected state, initiated by the network side; cell reselection is a process in which the terminal device is in the RRC idle state and RRC inactive state, initiated by the terminal device. Specifically, when the terminal device successfully resides in a cell and does not perform any data services, the terminal device will be in the RRC idle state / RRC inactive state. The terminal device in the RRC idle state / RRC inactive state will measure the signal quality of the serving cell and the neighboring cell. If the signal quality of the serving cell is poor, and the signal quality of the neighboring cell is good, the terminal device will actively select a cell with a higher priority or better signal quality as the serving cell. This process is called cell reselection. The overall process of cell reselection includes: initiating neighboring cell measurement, reselection evaluation and decision, and cell reselection execution.

[0117] Start neighboring cell measurement: The terminal device determines whether to start neighboring cell measurement based on the measurement start conditions. After the determination is made, the terminal device measures the signal quality of the current serving cell and neighboring cells.

[0118] Reselection evaluation judgment: The terminal device judges whether the signal quality of the neighboring cell is continuously within T reselection During this period (a period of time), the cell reselection criteria are always met, including the R / S criteria. If the cell reselection criteria are met, cell reselection is performed; if the cell reselection criteria are not met, the cell remains in the current serving cell.

[0119] Cell reselection execution: The terminal device performs cell reselection and starts receiving system messages of the new cell. If there is no access restriction, the terminal device in the RRC idle state initiates RRC connection establishment, and the terminal device in the RRC Inactive state initiates RRC recovery to reside in the new cell.

[0120] Figure 5 is a schematic diagram of abnormal events occurring during measurement-based handover. In the RRC connected state, measurement-based handover may have the following problems: (1) The handover is too late, and the terminal device has a poor service experience in the source cell during the time period t1 to t2, or even detects RLF in the source cell; (2) The target cell is determined based on the measurement results. For example, the target cell is determined and the handover is performed based on the measurement results during the time period t0 to t1, but there is no guarantee that the target cell will be successfully accessed (HOF may occur), and there is no guarantee that the terminal device will not experience abnormal events such as RLF, ping-pong handover, or unnecessary handover after successfully accessing the target cell.

[0121] Figure 6 is a schematic diagram of an abnormal event occurring during measurement-based cell reselection. In the RRC Idle / RRC Inactive state, measurement-based cell reselection may have the following problems: based on the measurement results between t1 and t2, the terminal device performs cell reselection and cannot ensure that an RRC connection is established with the reselected cell to enter the RRC Connected state. For example, RRC connection establishment (RRC setup) fails in the RRC Idle state, RRC connection recovery (RRC resume) fails in the RRC Inactive state, or RLF occurs soon after entering the RRC Connected state.

[0122] To this end, an embodiment of the present application proposes a communication method that can reduce the probability of abnormal events during mobility management, thereby improving the success rate of switching, user experience and network performance.

[0123] Figure 7 is a schematic flow diagram of a communication method 700 provided in an embodiment of the present application. The terminal device in the embodiment of the present application is in an RRC connected state, the first access network device can be understood as a source base station, and the second access network device can be understood as a target base station.

[0124] S710, the first access network device sends first configuration information to the terminal device, the first configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching. The first configuration information may include one or more predicted quantities, and the predicted quantity includes one of the following abnormal events: RLF in the serving cell, HOF in at least one neighboring cell, RLF in at least one neighboring cell / fast RLF in at least one neighboring cell, ping-pong switching in at least one neighboring cell, unnecessary switching in at least one neighboring cell, or other customized events. The occurrence of the above-mentioned abnormal events (the occurrence of unintended events) can be used as the predicted quantity, and the avoidance of unintended events can also be used as the predicted quantity. Correspondingly, the terminal device receives the first configuration information from the first access network device. The serving cell can be understood as the source cell, and the neighboring cell can be understood as other cells except the serving cell. Accordingly, the terminal device uses these cells as potential switching target cells to infer relevant predicted quantities.

[0125] It should be noted that the RLF in the serving cell can be understood as the RLF in the source cell when the terminal device does not perform switching. The abnormal event in the neighboring cell can be understood as the abnormal event that may occur when the terminal device uses the neighboring cell as the switching target cell during the switching process to the neighboring cell or within a period of time after successfully switching to the neighboring cell. The HOF in the neighboring cell can be understood as the HOF in the process of the terminal device switching from the serving cell to the neighboring cell. The (very fast) RLF in the neighboring cell can be understood as the RLF within a preset period of time after the terminal device successfully switches to the neighboring cell. The ping-pong switching in the neighboring cell can be understood as the ping-pong switching within a preset period of time after the terminal device successfully switches to the neighboring cell. The unnecessary switching in the neighboring cell can be understood as the unnecessary switching within a preset period of time after the terminal device successfully switches to the neighboring cell.

[0126] Exemplarily, other customized events include the situation where the signal quality of the serving cell is less than or equal to the fifth threshold, the situation where the signal quality of the neighboring cell is greater than or equal to the sixth threshold, or the situation where the signal quality of the serving cell is less than or equal to the fifth threshold and the signal quality of the neighboring cell is greater than or equal to the sixth threshold; this application does not limit other customized events. Among them, the fifth threshold and the sixth threshold can be configured to the terminal device by the first access network device, such as being configured to the terminal device through the first configuration information, and can be predefined or determined by the terminal device itself, and there is no limitation on this. The signal quality in the embodiment of the present application can be characterized by RSRP, RSSI, RSRQ, or SINR, and can also be characterized by the result calculated by the S criterion calculation formula / R criterion calculation formula based on the RSRP, RSSI, RSRQ, or SINR measured by the terminal device.

[0127] Exemplarily, the neighboring cell may be all or part of the neighboring cell measured by the terminal device, or all or part of the neighboring cell that meets the triggering conditions of the predicted measurement, or at least one cell indicated by the first configuration information, or a cell determined by the terminal device based on the cell or number of neighboring cells indicated by the first configuration information.

[0128] Optionally, the starting conditions for predicting the predicted quantity include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction triggered by a non-event. The event can be an event corresponding to a certain event type among the above-mentioned event types A1 to A6 and event types B1 to B2, or it can be an entry condition that only refers to the above-mentioned event type without requiring the entry condition to be continuously satisfied for a period of time (time hysteresis), such as the signal quality meeting the threshold condition but not requiring it to be continuously satisfied for a period of time; the event can also be that the priority of the neighboring cell is higher than the priority of the serving cell, and the priority can be the priority of the measurement object, the priority of the frequency point, or the priority of the cell; the event can also be other events, which are not limited in this application and are specifically indicated to the terminal device by the network side (first access network device).

[0129] (1) Event-triggered prediction: The corresponding prediction type is "event", "prediction type" = "event triggered"; the prediction amount is one: "prediction amount" = 1; regardless of the prediction interval value, the terminal device will ignore it. For example, if the signal quality of the serving cell or neighboring cell meets the entry threshold of a certain event, or the priority of the neighboring cell is higher than that of the serving cell, the terminal device will be triggered to make a prediction.

[0130] (2) Event-triggered periodic prediction: The corresponding prediction type is "event", "prediction type" = "event triggered"; the number of predictions is multiple: "prediction amount" > 1; reporting interval: set "prediction interval" as required. For example, if the signal quality of the serving cell or neighboring cell meets the entry threshold of a certain event, or the priority of the neighboring cell is higher than that of the serving cell, the terminal device will be triggered to periodically perform multiple predictions. Specifically, when the prediction is triggered, the terminal device will start the timers corresponding to the multiple predictions and the prediction count counter. The prediction process will not end until the prediction count reaches the upper limit. If the prediction count is set to unlimited, the terminal device will continue to perform predictions periodically.

[0131] (3) Non-event-triggered periodic prediction: The corresponding prediction type is "periodic", "prediction type" = "periodical", the number of predictions is multiple: "prediction amount" > 1, and the reporting interval is set as required. The terminal device makes predictions according to the specified prediction interval (period).

[0132] Optionally, for predicting at least one time period of the predicted quantity, the first access network device may indicate the time interval of the time period and the number of time periods to the terminal device through the first configuration information. The first access network device may also indicate the terminal device through the first configuration information indicating a time period list, in which the start and end points of each time period may be indicated. The first access network device may also indicate the terminal device through the first configuration information indicating the range of the time period and the granularity of the time interval of the time period. It should be noted that when the time period is divided by the range of the time period and the granularity of the time interval of the time period, if the length of the tail time period (the last time period) after the division is less than the time interval, it can be flexibly handled according to the implementation, and the prediction may be made in the tail time period or not. The at least one time period of the predicted quantity may also be replaced by the earliest or latest time point / time period in which the abnormal event is predicted to occur, or by the earliest or latest time point / time period in which the abnormal event is predicted not to occur. The earliest time point may be the starting point of the earliest time period, and the latest time point may be the end point of the latest time period.

[0133] Exemplarily, when the terminal device performs a single prediction, it can predict RLF in the serving cell, HOF in at least one neighboring cell, RLF in at least one neighboring cell, ping-pong switching in at least one neighboring cell, and unnecessary switching in at least one neighboring cell within one or more time periods, or other custom events in the serving cell and / or neighboring cell.

[0134] Optionally, the triggering condition for the pre-measurement includes: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold. The first threshold and the second threshold may be configured by the first access network device for the terminal device, may be predefined, or may be determined independently by the terminal device, and are not limited thereto.

[0135] For example, taking the predicted quantity as ping-pong switching in neighboring area 1, the first threshold is 30% and the second threshold is 70% as an example, if it is predicted that no ping-pong event will occur in neighboring area 1 within time period 1, or the probability of a ping-pong event occurring in neighboring area 1 within time period 1 is less than or equal to 30%, or the probability of a ping-pong event not occurring in neighboring area 1 within time period 1 is greater than or equal to 70%, then the trigger condition of the predicted quantity is met; wherein the above-mentioned at least one neighboring area includes neighboring area 1, and the above-mentioned at least one time period includes time period 1.

[0136] Optionally, the triggering condition for switching includes: a combination of one or more predicted quantities satisfying the triggering conditions of the predicted quantities, or a combination of one or more predicted quantities satisfying the triggering conditions of these predicted quantities, or a weighted sum of the occurrence probabilities corresponding to the multiple predicted quantities is less than or equal to a third threshold, or a weighted sum of the non-occurrence probabilities corresponding to the multiple predicted quantities is greater than or equal to a fourth threshold. The third threshold and the fourth threshold may be configured for the terminal device by the first access network device, may be predefined, or may be determined by the terminal device itself, and this is not limited.

[0137] For example, if a predicted quantity satisfies the trigger condition of the predicted quantity, then the trigger condition for handover is considered to be met. For example, taking the predicted quantity as HOF in neighboring cell 1 as an example, if it is predicted that HOF does not occur in neighboring cell 1 within time period 1, then neighboring cell 1 is considered to meet the trigger condition for handover within time period 1.

[0138] Exemplarily, if multiple predicted quantities satisfy the trigger conditions of the predicted quantities respectively, then the trigger conditions for handover are considered to be satisfied. For example, taking the multiple predicted quantities as RLF in the serving cell and HOF in neighboring cell 1 as an example, if it is predicted that RLF does not occur within time period 1 of the serving cell and HOF does not occur within time period 1 of neighboring cell 1, then it is considered that neighboring cell 1 satisfies the trigger conditions for handover within time period 1. For another example, taking the predicted quantities as including RLF in the serving cell and very fast RLF in neighboring cell 1 as an example, if it is predicted that RLF does not occur within time period 1 of the serving cell and very fast RLF does not occur within time period 1 of neighboring cell 1, then it is considered that neighboring cell 1 satisfies the trigger conditions for handover within time period 1.

[0139] Exemplarily, if the weighted sum of the occurrence probabilities corresponding to the multiple predicted quantities is less than or equal to the third threshold, it is considered that the trigger condition for handover is met, wherein the weighted sum is multiplied by the weight coefficient and then summed. For example, taking the multiple predicted quantities of RLF in the serving cell, HOF in neighboring cell 1, very fast RLF in neighboring cell 1, and ping-pong handover in neighboring cell 1 as an example; if it is predicted that within time period 1, the weighted sum of the occurrence probability *w1 of RLF in the serving cell, the occurrence probability *w2 of HOF in neighboring cell 1, the occurrence probability *w3 of very fast RLF in neighboring cell 1, and the occurrence probability *w4 of ping-pong handover in neighboring cell 1 is less than or equal to the third threshold, it is considered that neighboring cell 1 meets the trigger condition for handover within time period 1, wherein the weight coefficient can be a percentage value or a numerical value, which is not limited.

[0140] Exemplarily, if the weighted sum of the non-occurrence probabilities corresponding to the multiple predicted quantities is greater than or equal to the fourth threshold, it is considered that the triggering condition for handover is met. For example, taking the multiple predicted quantities of RLF in the serving cell, HOF in neighboring cell 1, very fast RLF in neighboring cell 1, and ping-pong handover in neighboring cell 1 as an example, if it is predicted that within time period 1, the non-occurrence probability of RLF in the serving cell *w5 + the non-occurrence probability of HOF in neighboring cell 1 *w6 + the non-occurrence probability of very fast RLF in neighboring cell 1 *w7 + the non-occurrence probability of ping-pong handover in neighboring cell 1 *w8 is greater than or equal to the fourth threshold, it is considered that neighboring cell 1 meets the triggering condition for handover within time period 1, where the weight coefficient can be a percentage value or a numerical value, and is not limited.

[0141] Optionally, the first configuration information may be sent by the first access network device to the terminal device through a dedicated RRC message, such as an RRC reconfiguration message or an RRC recovery message; the first configuration information may also be sent or indicated to the terminal device by the first access network device through a public RRC message, for example, the first configuration information may be sent by the first access network device to the terminal device through a system information block (SIB) message.

[0142] S720: The terminal device predicts a first prediction result based on the first configuration information. Specifically, if the first configuration information includes a start condition for predicting the predicted quantity, the terminal device predicts the first prediction result when the start condition for predicting the predicted quantity is met. If the first configuration information does not include a start condition for predicting the predicted quantity, the terminal device may directly predict the first prediction result based on the first configuration information.

[0143] Exemplarily, the terminal device predicts a first prediction result based on the first configuration information and the input information; the input information includes one or more of the historical first prediction result, the historical location information of the terminal device, the historical speed information of the terminal device, the historical movement path information of the terminal device, or the historical main neighboring area ephemeris information. Among them, the input information specifically includes which information can be configured to the terminal device by the network side (first access network device), can be predefined, or can be determined by the terminal device itself, and this application does not limit this. For example, the terminal device predicts the first prediction result through AI / ML reasoning based on the first configuration information and the input information.

[0144] Optionally, the first prediction result includes at least one of the following: whether an abnormal event occurs within at least one time period of the serving cell and / or at least one neighboring cell, the probability of occurrence of the abnormal event, and the probability of non-occurrence of the abnormal event, wherein the first prediction result may include at least one of the following: the identifier of the serving cell and / or at least one neighboring cell, indication information of whether at least one abnormal event corresponding to the cell occurs, and the probability of occurrence / non-occurrence of at least one abnormal event corresponding to the cell; the identifier of at least one first candidate cell that meets the triggering condition of the predicted quantity, and at least one time period that corresponds to the at least one first candidate cell and meets the triggering condition of the predicted quantity; the identifier of at least one second candidate cell that meets the triggering condition of switching, and at least one time period that corresponds to the at least one second candidate cell and meets the triggering condition of switching, wherein the serving cell and at least one neighboring cell include at least one first candidate cell. Optionally, the time period included in the first prediction result may also be replaced by the earliest or latest time period / time point in which the abnormal event occurs / does not occur.

[0145] It should be understood that there are three ways to predict "yes" in this application: one is to predict "yes" and the other is to predict "no". For example, a terminal device predicts whether an abnormal event will occur. In one way, the terminal device predicts whether the abnormal event will occur. If it does occur, it is true; if it does not occur, it is false. In another way, the terminal device predicts whether the abnormal event will not occur. If it does not occur, it is true; if it does occur, it is false. For other content in this article that predicts "yes", please refer to the explanation here.

[0146] Exemplarily, the first configuration information includes a predicted quantity, a starting condition for predicting the predicted quantity, and at least one time period for predicting the predicted quantity, and the first prediction result includes at least one of the following: whether an abnormal event occurs, or the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event within at least one time period in the serving cell and / or at least one neighboring cell.

[0147] Exemplarily, the first configuration information includes a predicted quantity, a starting condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, and a triggering condition for the predicted quantity, and the first prediction result includes at least one of the following: an identifier of at least one first candidate cell that meets the triggering condition for the predicted quantity, a time period that meets the triggering condition for the predicted quantity corresponding to at least one first candidate cell, and a probability of occurrence / non-occurrence of an abnormal event indicated by the predicted quantity in at least one time period that meets the triggering condition for the predicted quantity in the serving cell and / or at least one first candidate cell.

[0148] Exemplarily, the first configuration information includes a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, and a trigger condition for switching. The first prediction result includes at least one of the following: whether an abnormal event occurs in at least one time period of the serving cell and / or at least one neighboring cell, or the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event, the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity, and the time period that meets the trigger condition of the predicted quantity corresponding to at least one first candidate cell.

[0149] Exemplarily, the first configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, at least one time period for predicting the predicted quantity, the triggering conditions for the predicted quantity, and the triggering conditions for switching, and the first prediction result includes at least one of the following: the identifier of at least one second candidate cell that meets the triggering conditions for switching, and the time period corresponding to at least one second candidate cell that meets the triggering conditions for switching.

[0150] In the technical solution provided in the embodiment of the present application, the terminal device can predict a first prediction result (whether an abnormal event will occur in at least one time period in the future or the probability of an abnormal event occurring or the probability of non-occurrence of an abnormal event, or the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to at least one first candidate cell, or the identifier of at least one second candidate cell that meets the trigger condition of switching and the time period that meets the trigger condition of switching corresponding to at least one second candidate cell) based on the first configuration information from the first access network device; the target cell for switching can be determined based on the first prediction result, which can reduce the probability of occurrence of abnormal events in the mobility management process, thereby improving the success rate of switching, user experience and network performance.

[0151] Optionally, after S720, in the basic handover process, the terminal device needs to report the first prediction result to the first access network device. The first access network device sends a handover command to the terminal device based on the first prediction result. The handover command instructs handover to the target cell during the target time period. The terminal device switches from the serving cell to the target cell during the target time period according to the handover command. The following is an exemplary description with reference to S730 to S750.

[0152] S730, the terminal device sends the first prediction result to the first access network device; correspondingly, the first access network device receives the first prediction result from the terminal device.

[0153] S740, the first access network device sends a handover command to the terminal device based on the first prediction result, and the handover command includes instruction information for instructing handover to the target cell in the target time period. The target cell in the handover command may be one of the at least one neighboring cell included in the first prediction result, and the target time period in the handover command may be one of the at least one time period included in the first prediction result. Correspondingly, the terminal device receives the handover command from the first access network device. Exemplarily, the handover command may instruct the terminal device to access the target cell in the target time period. As above, the target time period may be a target time point, and further, may be the earliest target time point or the latest target time point.

[0154] Optionally, the first access network device determines, based on the first prediction result, that the current service cell of the terminal device can continue to serve as a service cell and does not switch for the terminal device.

[0155] Optionally, the first access network device sends a handover request message to the second access network device based on the first prediction result, and the handover request message includes part or all of the first prediction result; correspondingly, the second access network device receives the handover request message from the first access network device. The second access network device performs access admission control based on part or all of the first prediction result to determine the resources of the target cell allocated to the terminal device, and sends a handover request confirmation message to the first access network device, and the handover request confirmation message may include parameter information required to indicate handover to the target cell in the target time period; correspondingly, the first access network device receives the handover request confirmation message from the second access network device. The first access network device sends a handover command to the terminal device based on the handover request confirmation message, and the handover command includes instruction information for indicating handover to the target cell in the target time period; correspondingly, the terminal device receives the handover command from the first access network device.

[0156] Exemplarily, the first prediction result sent by the terminal device to the first access network device may include the identifier of at least one second candidate cell that meets the triggering condition for switching, the time period that meets the triggering condition for switching corresponding to at least one second candidate cell, and at least one item of the probability of occurrence / non-occurrence of an abnormal event indicated by the predicted quantity in at least one time period that meets the triggering condition for switching in the serving cell and / or at least one second candidate cell; after the first access network device receives the first prediction result, it sends a switching request message to the second access network device, and the switching request message includes one or more of the following: the identifier of at least one predicted second candidate cell, at least one time period corresponding to at least one predicted second candidate cell, and the probability of occurrence / non-occurrence of at least one abnormal event in the serving cell and / or at least one second candidate cell in the time period; based on the switching request message, the second access network device determines the target cell allowed to be accessed by the terminal device and the target time period for accessing the target cell from at least one second candidate cell; the second access network device sends a switching request confirmation message to the first access network device, and the switching request confirmation message includes the parameter information required to indicate switching to the target cell in the target time period; correspondingly, the first access network device receives the switching request confirmation message from the second access network device. The first access network device sends a handover command to the terminal device based on the handover request confirmation message. The handover command includes instruction information for instructing handover to the target cell during the target time period. In response, the terminal device receives the handover command from the first access network device. In this example, the first configuration information includes a predicted quantity, a condition for starting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, and a handover trigger condition.

[0157] Optionally, the first prediction result sent by the terminal device to the first access network device may include whether an abnormal event occurs, or the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event in at least one time period in the serving cell and / or at least one neighboring cell; the first access network device is based on the received first prediction result, and further, according to the triggering condition of the predicted quantity, determines the identifier of at least one first candidate cell that meets the triggering condition of the predicted quantity and the time period that meets the triggering condition of the predicted quantity corresponding to the at least one first candidate cell; or, the first access network device determines the identifier of at least one second candidate cell that meets the triggering condition of the switching and the time period that meets the triggering condition of the switching corresponding to the at least one second candidate cell based on the first prediction result and the triggering condition of the switching; the first access network device sends a switching request message to the second access network device, and the switching request The message may include at least one of the following: an identifier of at least one second candidate cell that meets the handover triggering condition, a time period corresponding to each of the at least one second candidate cell that meets the handover triggering condition, and a probability of occurrence / non-occurrence of at least one abnormal event in the at least one second candidate cell within the above-mentioned time period; based on the handover request message, the second access network device determines a target cell and a target time period for accessing the target cell from the at least one second candidate cell, wherein the time period corresponding to the target cell that meets the handover triggering condition includes the target time period; the second access network device sends a handover request confirmation message to the first access network device, the handover request confirmation message including parameter information required to instruct handover to the target cell during the target time period; correspondingly, the first access network device receives the handover request confirmation message from the second access network device. Based on the handover request confirmation message, the first access network device sends a handover command to the terminal device, the handover command including instruction information for instructing handover to the target cell during the target time period; correspondingly, the terminal device receives the handover command from the first access network device. In this example, the first configuration information includes a predicted quantity, a condition for starting the predicted quantity, and at least one time period for predicting the predicted quantity.

[0158] Optionally, the first prediction result sent by the terminal device to the first access network device may include the identifier of at least one first candidate cell that meets the triggering condition of the predicted quantity, the time period that meets the triggering condition of the predicted quantity corresponding to at least one first candidate cell, and the probability that at least one abnormal event occurs / does not occur in the above-mentioned event period in at least one first candidate cell; based on the received first prediction result, the first access network device further determines the identifier of at least one second candidate cell that meets the triggering condition of the switching and the time period that meets the triggering condition of the switching corresponding to at least one second candidate cell according to the triggering condition of the switching; the first access network device sends a switching request message to the second access network device, and the switching request message includes at least one second candidate cell that meets the triggering condition of the switching. The first access network device receives the handover request confirmation message from the second access network device. The first access network device sends a handover request confirmation message to the first access network device, and the handover request confirmation message includes parameter information required to indicate handover to the target cell in the target time period. Correspondingly, the first access network device receives the handover request confirmation message from the second access network device. The first access network device sends a handover command to the terminal device based on the handover request confirmation message, and the handover command indicates handover to the target cell in the target time period. Correspondingly, the terminal device receives the handover command from the first access network device. In this example, the first configuration information includes the predicted amount, the start condition for predicting the predicted amount, at least one time period for predicting the predicted amount, and the trigger condition for predicting the predicted amount.

[0159] Optionally, the first prediction result received by the first access network device may include at least one of the following: an identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity; a time period that meets the trigger condition of the predicted quantity corresponding to at least one first candidate cell; a probability of occurrence / non-occurrence of at least one abnormal event in the corresponding time period of at least one first candidate cell; an identifier of at least one second candidate cell that meets the trigger condition of switching; a time period that meets the trigger condition of switching corresponding to at least one second candidate cell; a probability of occurrence / non-occurrence of at least one abnormal event in the corresponding time period of at least one second candidate cell, whether an abnormal event occurs, or the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event in at least one time period of the serving cell and / or at least one neighboring cell. This application does not make specific limitations on this.

[0160] S750: The terminal device switches from the serving cell to the target cell in the target time period according to the switching command.

[0161] Optionally, the handover command may indicate handover to the target cell in the target time period, or may only indicate handover to the target cell.

[0162] Exemplarily, the second access network device sends a handover request confirmation message to the first access network device, and the handover request confirmation message includes information required to indicate access to the target cell. Correspondingly, the first access network device receives the handover request confirmation message from the second access network device. The target time period obtained by the first access network device can be the target time period indicated by the second access network device obtained from the handover request confirmation message, or it can be the target time period determined by the first access network device itself. In one implementation, the first access network device sends a handover command to the terminal device in an adjacent target time period, and the handover command indicates handover to the target cell; correspondingly, the terminal device receives the handover command from the first access network device and switches from the serving cell to the target cell. In another implementation, the first access network device switches to the target cell in the target time period indicated by the handover command; correspondingly, the terminal device receives the handover command from the first access network device and switches from the serving cell to the target cell in the indicated target time period.

[0163] Optionally, after S720, in the conditional handover process, the terminal device may determine a target cell for handover and a target time period corresponding to the target cell based on the first prediction result, and handover to the target cell during the target time period.

[0164] S760, the terminal device determines the target cell that meets the trigger conditions of the predicted quantity and the target time period that meets the trigger conditions of the predicted quantity corresponding to the target cell based on the first prediction result; or determines the target cell that meets the trigger conditions of switching and the target time period that meets the trigger conditions of switching corresponding to the target cell.

[0165] S770, the terminal device switches from the serving cell to the target cell during the target time period.

[0166] Optionally, if the target cell determined by the terminal device is a serving cell, the terminal device continues to stay in the serving cell during the target time period and does not perform switching.

[0167] Exemplarily, the terminal device predicts a first prediction result including whether an abnormal event occurs, or the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event in at least one time period of a serving cell and / or at least one neighboring cell based on the predicted quantity, the starting conditions for the predicted predicted quantity, at least one time period of the predicted predicted quantity, the triggering conditions for the predicted quantity, and at least one item of the triggering conditions for switching included in the first configuration information; the terminal device determines the target cell that meets the triggering conditions of the predicted quantity and the target time period corresponding to the target cell that meets the triggering conditions of the predicted quantity based on the first prediction result and the triggering conditions of the predicted quantity; the terminal device switches from the serving cell to the target cell during the target time period.

[0168] Exemplarily, the terminal device predicts a first prediction result including an identifier of at least one first candidate cell that meets the triggering condition of the predicted quantity and a time period that meets the triggering condition of the predicted quantity, corresponding to at least one first candidate cell, based on the predicted quantity, the start condition of the predicted predicted quantity, at least one time period of the predicted predicted quantity, and the triggering condition of the predicted quantity included in the first configuration information; the terminal device determines a target cell and a target time period that meets the triggering condition of the predicted quantity from at least one first candidate cell based on the first prediction result; the terminal device switches from the serving cell to the target cell during the target time period.

[0169] Exemplarily, the terminal device predicts a first prediction result including the identifier of at least one second candidate cell that meets the triggering condition for switching and the time period that meets the triggering condition for switching corresponding to at least one second candidate cell based on the predicted quantity, the starting condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, the triggering condition for the predicted quantity, and the triggering condition for switching included in the first configuration information; the terminal device determines the target cell and the target time period that meets the triggering condition for switching from at least one second candidate cell based on the first prediction result; the terminal device switches from the serving cell to the target cell during the target time period.

[0170] The predicted amount in the embodiment of the present application is based on an abnormal event as an example. Optionally, the predicted amount may also be that no abnormal event occurs, such as RLF does not occur in the serving cell, switching is successful in the neighboring cell, RLF does not occur in the neighboring cell, ping-pong switching does not occur in the neighboring cell, unnecessary switching does not occur in the neighboring cell, or other customized events do not occur; this application does not limit this.

[0171] The embodiment of the present application proposes another communication method, which can reduce the probability of abnormal events during mobility management, thereby improving the success rate of RRC connection establishment / RRC connection recovery, user experience and network performance.

[0172] Figure 8 is a schematic flow diagram of another communication method 800 provided in an embodiment of the present application. The terminal device in the embodiment of the present application is in an RRC idle state or an RRC inactive state.

[0173] S810, the first access network device sends second configuration information to the terminal device, the second configuration information includes at least one of the predicted quantity, the start condition of the predicted predicted quantity, at least one time period of the predicted predicted quantity, the trigger condition of the predicted quantity, or the trigger condition of the cell reselection, and the predicted quantity includes one of the following abnormal events: failure to establish an RRC connection in the serving cell, failure to recover the RRC connection in the serving cell, RLF after establishing an RRC connection with the serving cell / RLF soon after establishing an RRC connection with the serving cell, failure to establish an RRC connection in at least one neighboring cell, failure to recover the RRC connection in at least one neighboring cell, RLF after establishing an RRC connection with at least one neighboring cell / RLF soon after establishing an RRC connection with at least one neighboring cell, or other customized events. Correspondingly, the terminal device receives the second configuration information from the first access network device.

[0174] It should be noted that the failure to establish the RRC connection in the serving cell (neighboring cell) can be understood as that, after the terminal device in the RRC idle state sends an RRC connection establishment request to the serving cell (neighboring cell), it does not receive a response message from the serving cell (neighboring cell) within a period of time. The response message includes a radio link control establishment (RRC setup) message or a radio link control rejection (RRC reject) message sent by the network side; in other words, the failure to establish the RRC connection in the serving cell (neighboring cell) can be understood as the failure of the terminal device in the RRC idle state to initiate RRC connection establishment to the serving cell (neighboring cell).

[0175] The failure of RRC connection recovery in the serving cell (neighboring cell) can be understood as that, after the terminal device in the RRC-inactivated state sends an RRC connection recovery request to the serving cell (neighboring cell), it does not receive a response message from the serving cell (neighboring cell) within a period of time. The response message includes a radio link control recovery (RRC resume) message, an RRC setup message, or a radio link control release (RRC release) message sent by the network side; in other words, the failure of RRC connection recovery in the serving cell (neighboring cell) can be understood as the failure of the terminal device in the RRC-inactivated state to initiate RRC connection recovery to the serving cell (neighboring cell).

[0176] The RLF after establishing an RRC connection with the serving cell (neighboring cell) can be understood as the RLF in the serving cell (neighboring cell) within a preset period of time after the terminal device in the RRC idle state initiates the RRC connection establishment process to the serving cell (neighboring cell) or the terminal device in the RRC inactive state initiates the RRC connection recovery process to the serving cell (neighboring cell) and enters the RRC connection state.

[0177] Exemplarily, other customized events include the situation where the signal quality of the serving cell is less than or equal to the fifth threshold, the situation where the signal quality of the neighboring cell is greater than or equal to the sixth threshold, or the situation where the signal quality of the serving cell is less than or equal to the fifth threshold and the signal quality of the neighboring cell is greater than or equal to the sixth threshold; this application does not limit other customized events. Among them, the fifth threshold and the sixth threshold can be configured to the terminal device by the first access network device, can be predefined, or can be determined by the terminal device itself, and there is no limitation on this. The signal quality in the embodiment of the present application can be characterized by RSRP, RSSI, RSRQ, or SINR, and can also be characterized by the result calculated by the S criterion calculation formula / R criterion calculation formula based on the RSRP, RSSI, RSRQ, or SINR measured by the terminal device.

[0178] Exemplarily, the neighboring cell may be all or part of the neighboring cell measured by the terminal device, or may be all or part of the neighboring cell that meets the triggering condition of the predicted measurement.

[0179] Optionally, the starting conditions for predicting the predicted quantity include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction triggered by a non-event. The event can be an event corresponding to a certain event type among the above-mentioned event types A1 to A6 and event types B1 to B2, or it can be an entry condition that only refers to the above-mentioned event type without requiring the entry condition to be continuously satisfied for a period of time (time hysteresis), such as the signal quality meeting the threshold condition but not requiring it to be continuously satisfied for a period of time; the event can also be that the priority of the neighboring cell is higher than the priority of the serving cell, and the priority can be the priority of the measurement object, the priority of the frequency point, or the priority of the cell; the event can also be other events, which are not limited in this application and are specifically indicated to the terminal device by the network side (first access network device).

[0180] (1) Event-triggered prediction: The corresponding prediction type is "event", "prediction type" = "event triggered"; the prediction amount is one: "prediction amount" = 1; regardless of the prediction interval value, the terminal device will ignore it. For example, if the signal quality of the serving cell or neighboring cell meets the entry threshold of a certain event, or the priority of the neighboring cell is higher than that of the serving cell, the terminal device will be triggered to make a prediction.

[0181] (2) Event-triggered periodic prediction: The corresponding prediction type is "event", "prediction type" = "event triggered"; the number of predictions is multiple: "prediction amount" > 1; reporting interval: set "prediction interval" as required. For example, if the signal quality of the serving cell or neighboring cell meets the entry threshold of a certain event, or the priority of the neighboring cell is higher than that of the serving cell, the terminal device will be triggered to periodically perform multiple predictions. Specifically, when the prediction is triggered, the terminal device will start the timers corresponding to the multiple predictions and the prediction count counter. The prediction process will not end until the prediction count reaches the upper limit. If the prediction count is set to unlimited, the terminal device will continue to perform predictions periodically.

[0182] (3) Non-event-triggered periodic prediction: The corresponding prediction type is "periodic", "prediction type" = "periodical", the number of predictions is multiple: "prediction amount" > 1, and the reporting interval is set as required. The terminal device makes predictions according to the specified prediction interval (period).

[0183] Optionally, for predicting at least one time period of the predicted quantity, the first access network device may indicate the time interval of the time period and the number of time periods to the terminal device through the second configuration information. The first access network device may also indicate the time period list to the terminal device through the second configuration information. The start and end points of each time period may be indicated in the time period list. The first access network device may also indicate the range of the time period and the granularity of the time interval of the time period to the terminal device through the second configuration information. It should be noted that when the time periods are divided by the range of the time period and the granularity of the time interval of the time period, if the length of the tail time period (the last time period) after the division is less than the time interval, it can be flexibly handled according to the implementation. It can be predicted or not in the tail time period. The at least one time period of the predicted quantity can also be replaced by the earliest or latest time point / time period in which the abnormal event is predicted to occur, or it can be replaced by the earliest or latest time point / time period in which the abnormal event is predicted not to occur. The earliest time point can be the starting point of the earliest time period, and the latest time point can be the end point of the latest time period.

[0184] Exemplarily, when the terminal device performs a single prediction, it can predict the failure of RRC connection establishment in the serving cell, RLF after establishing an RRC connection with the serving cell, failure of RRC connection establishment in at least one neighboring cell, and RLF after establishing an RRC connection with at least one neighboring cell within one or more time periods. Exemplarily, when the terminal device performs a single prediction, it can predict the failure of RRC connection recovery in the serving cell, RLF after establishing an RRC connection with the serving cell, failure of RRC connection recovery in at least one neighboring cell, RLF after establishing an RRC connection with at least one neighboring cell, or other custom events of the serving cell and / or neighboring cell within one or more time periods.

[0185] Optionally, the triggering condition for the pre-measurement includes: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold. The first threshold and the second threshold may be configured by the first access network device for the terminal device, may be predefined, or may be determined independently by the terminal device, and are not limited thereto.

[0186] For example, taking the predicted quantity as the failure of RRC connection establishment in neighboring cell 1, the first threshold is 30% and the second threshold is 70% as an example, if it is predicted that there will be no RRC connection establishment failure in neighboring cell 1 within time period 1, or the predicted probability of RRC connection establishment failure in neighboring cell 1 within time period 1 is less than or equal to 30%, or the predicted probability of RRC connection establishment failure in neighboring cell 1 within time period 1 is greater than or equal to 70%, then the triggering condition of the predicted quantity is met; wherein, the above-mentioned at least one neighboring cell includes neighboring cell 1, and the above-mentioned at least one time period includes time period 1.

[0187] Optionally, the triggering conditions for cell reselection include: a combination of one or more predicted quantities corresponding to the triggering conditions of the predicted quantities / a combination of one or more predicted quantities satisfying the triggering conditions of these predicted quantities, or, the weighted sum of the occurrence probabilities corresponding to multiple predicted quantities is less than or equal to a third threshold, or, the weighted sum of the non-occurrence probabilities corresponding to multiple predicted quantities is greater than or equal to a fourth threshold, or, the weighted sum of the occurrence probabilities or non-occurrence probabilities corresponding to multiple predicted quantities is considered when calculating the R criterion / S criterion for cell reselection.

[0188] Exemplarily, if a predicted quantity satisfies the triggering condition of the predicted quantity, then the triggering condition for cell reselection is considered to be met. For example, taking the predicted quantity as RRC connection establishment failure in neighboring cell 1 as an example, if it is predicted that no RRC connection establishment failure occurs in time period 1 of neighboring cell 1, then neighboring cell 1 is considered to meet the triggering condition for cell reselection in time period 1.

[0189] Exemplarily, if multiple predicted quantities respectively satisfy the triggering conditions of the predicted quantities, it is considered that the triggering conditions for cell reselection are satisfied. For example, taking the multiple predicted quantities as an example of RRC connection establishment failure in neighboring cell 1 and RLF after establishing RRC connection with neighboring cell 1, if it is predicted that RRC connection establishment failure does not occur within time period 1 of neighboring cell 1, and RLF after establishing RRC connection with neighboring cell 1 does not occur within time period 1 of neighboring cell 1, then it is considered that neighboring cell 1 satisfies the triggering conditions for cell reselection within time period 1. For another example, taking the predicted quantities including RRC connection recovery failure in neighboring cell 1 and RLF after establishing RRC connection with neighboring cell 1 as an example, if it is predicted that RRC connection recovery failure does not occur within time period 1 of neighboring cell 1, and RLF after establishing RRC connection with neighboring cell 1 does not occur within time period 1 of neighboring cell 1, then it is considered that neighboring cell 1 satisfies the triggering conditions for cell reselection within time period 1.

[0190] Exemplarily, if the weighted sum of the occurrence probabilities corresponding to the multiple predicted quantities is less than or equal to the third threshold, it is considered that the triggering condition for cell reselection is met, and the weighted sum is multiplied by the weight coefficient and then added. For example, take the multiple predicted quantities of RRC connection establishment failure in neighboring cell 1 and RLF after establishing an RRC connection with neighboring cell 1 as an example; if it is predicted that within time period 1, the weighted sum of the occurrence probability *w1 of RRC connection establishment failure in neighboring cell 1 and the occurrence probability *w2 of RLF after establishing an RRC connection with neighboring cell 1 is less than or equal to the third threshold, it is considered that neighboring cell 1 meets the triggering condition for cell reselection within time period 1; if it is predicted that within time period 1, the weighted sum of the occurrence probability *w1 of RRC connection establishment failure in neighboring cell 1 and the occurrence probability *w2 of RLF after establishing an RRC connection with neighboring cell 1 is greater than the third threshold, it is considered that neighboring cell 1 does not meet the triggering condition for cell reselection within time period 1. The weight coefficient can be a percentage value or a numerical value, and is not limited.

[0191] Exemplarily, if the weighted sum of the non-occurrence probabilities corresponding to the multiple predicted quantities is greater than or equal to the fourth threshold, it is considered that the triggering condition for cell reselection is met. For example, taking the multiple predicted quantities of RRC connection establishment failure in neighboring cell 1 and RLF after establishing an RRC connection with neighboring cell 1 as an example; if it is predicted that within time period 1, the weighted sum of the non-occurrence probability *w3 of RRC connection establishment failure in neighboring cell 1 and the non-occurrence probability *w4 of RLF after establishing an RRC connection with neighboring cell 1 is greater than or equal to the fourth threshold, it is considered that neighboring cell 1 meets the triggering condition for cell reselection within time period 1; if it is predicted that within time period 1, the weighted sum of the non-occurrence probability *w3 of RRC connection establishment failure in neighboring cell 1 and the non-occurrence probability *w4 of RLF after establishing an RRC connection with neighboring cell 1 is less than the fourth threshold, it is considered that neighboring cell 1 does not meet the triggering condition for cell reselection within time period 1. The weight coefficient can be a percentage value or a numerical value, and is not limited.

[0192] Exemplarily, when calculating the R criterion for cell reselection, that is, when calculating the R criterion based on the reselection frequency priority information and the signal quality of the cell measured or predicted by the terminal device, the weighted sum of the occurrence probabilities or non-occurrence probabilities corresponding to multiple predicted quantities (for example, the probability of failure to establish the RRC connection of cell 1 in time period 1 * w1 + the probability of occurrence of RLF after establishing an RRC connection with cell 1 in time period 1 * w2) or the weighted sum of the non-occurrence probabilities corresponding to multiple predicted quantities (for example, the probability of non-occurrence of failure to establish the RRC connection of cell 1 in time period 1 * w3 + the probability of non-occurrence of RLF after establishing an RRC connection with cell 1 in time period 1 * w4) is considered to make an evaluation decision on cell reselection.

[0193] Optionally, the second configuration information may be sent or indicated to the terminal device by the first access network device through a dedicated RRC message. For example, the second configuration information may be sent to the terminal device by the first access network device through an RRC release message or an RRC release with suspend condig message, wherein the RRC release message is used to instruct the terminal device to enter the RRC idle state, and the RRC release with suspend condig message is used to instruct the terminal device to enter the RRC inactive state. The second configuration information may also be sent or indicated to the terminal device by the first access network device through a public RRC message. For example, the second configuration information may be sent to the terminal device by the first access network device through an SIB message.

[0194] S820: The terminal device predicts a second prediction result based on the second configuration information. Specifically, if the second configuration information includes a start-up condition for predicting the predicted quantity, the terminal device predicts the second prediction result when the start-up condition for predicting the predicted quantity is met. If the second configuration information does not include the start-up condition for predicting the predicted quantity, the terminal device may directly predict the second prediction result based on the second configuration information.

[0195] Exemplarily, the terminal device predicts the second prediction result based on the second configuration information and the input information; the input information includes one or more of the historical second prediction result, the historical location information of the terminal device, the historical speed information of the terminal device, the historical movement path information of the terminal device, or the historical main neighboring area ephemeris information. Among them, the input information specifically includes which information can be configured to the terminal device by the network side (first access network device), can be predefined, or can be determined by the terminal device itself, and this application does not limit this. For example, the terminal device predicts the second prediction result through AI / ML reasoning based on the second configuration information and the input information.

[0196] Optionally, the second prediction result includes at least one of the following: whether an abnormal event occurs or the probability of an abnormal event occurring or the probability of non-occurrence of an abnormal event within at least one time period in the serving cell and / or at least one neighboring cell; the identifier of at least one first candidate cell that meets the triggering conditions of the predicted quantity, and the time period that meets the triggering conditions of the predicted quantity corresponding to at least one first candidate cell; the identifier of at least one second candidate cell that meets the triggering conditions of cell reselection, and the time period that meets the triggering conditions of cell reselection corresponding to at least one second candidate cell, wherein the serving cell and at least one neighboring cell include at least one first candidate cell. Optionally, the time period included in the second prediction result can also be replaced by the earliest or latest time period / time point in which the abnormal event occurs / does not occur.

[0197] Exemplarily, the second configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, and at least one time period for predicting the predicted quantity, and the second prediction result includes at least one of the following: whether an abnormal event occurs, the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event in at least one time period of the serving cell and / or at least one neighboring cell.

[0198] Exemplarily, the second configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, at least one time period for predicting the predicted quantity, and the triggering conditions for the predicted quantity, and the second prediction result includes at least one of the following: the identifier of at least one first candidate cell that meets the triggering conditions of the predicted quantity, and the time period that meets the triggering conditions of the predicted quantity corresponding to at least one first candidate cell.

[0199] Exemplarily, the second configuration information includes the predicted quantity, the starting conditions for predicting the predicted quantity, at least one time period for predicting the predicted quantity, the triggering conditions for the predicted quantity, and the triggering conditions for cell reselection, and the second prediction result includes at least one of the following: the identifier of at least one second candidate cell that meets the triggering conditions for cell reselection, and the time period corresponding to at least one second candidate cell that meets the triggering conditions for cell reselection.

[0200] In the technical solution provided in the embodiment of the present application, the terminal device can predict a second prediction result (whether an abnormal event will occur in at least one time period in the future or the probability of an abnormal event occurring or the probability of non-occurrence of an abnormal event, or the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to at least one first candidate cell, or the identifier of at least one second candidate cell that meets the trigger condition of cell reselection and the time period that meets the trigger condition of cell reselection corresponding to at least one second candidate cell) based on the second configuration information from the second access network device; the target cell for cell reselection can be determined according to the second prediction result, which can reduce the probability of occurrence of abnormal events in the mobility management process, thereby improving the success rate of RRC connection establishment / RRC connection recovery, user experience and network performance.

[0201] Optionally, after S820, the terminal device may determine a target cell for cell reselection and a target time period corresponding to the target cell based on the second prediction result, and reselect to the target cell during the target time period.

[0202] S830, the terminal device determines the target cell that meets the trigger conditions of the predicted quantity and the target time period that meets the trigger conditions of the predicted quantity corresponding to the target cell based on the second prediction result; or, determines the target cell that meets the trigger conditions of cell reselection and the target time period that meets the trigger conditions of cell reselection corresponding to the target cell.

[0203] S840, the terminal device reselects from the serving cell to the target cell during the target time period.

[0204] Optionally, if the target cell determined by the terminal device is the serving cell, the terminal device continues to reside in the serving cell during the target time period and does not reselect to other cells.

[0205] Exemplarily, the terminal device predicts a second prediction result including whether an abnormal event occurs, or the probability of occurrence of an abnormal event, or the probability of non-occurrence of an abnormal event in at least one time period of the serving cell and / or at least one neighboring cell based on the predicted quantity, the starting condition of the predicted predicted quantity, at least one time period of the predicted predicted quantity, the triggering condition of the predicted quantity, and at least one of the triggering conditions for cell reselection included in the second configuration information; the terminal device determines the target cell that meets the triggering condition of the predicted quantity and the target time period corresponding to the target cell that meets the triggering condition of the predicted quantity based on the second prediction result and the triggering condition of the predicted quantity; the terminal device reselects from the serving cell to the target cell during the target time period.

[0206] Exemplarily, the terminal device predicts a second prediction result including the identifier of at least one first candidate cell that meets the triggering condition of the predicted quantity and the time period that meets the triggering condition of the predicted quantity corresponding to at least one first candidate cell based on the predicted quantity, the starting condition of the predicted predicted quantity, at least one time period of the predicted predicted quantity, and the triggering condition of the predicted quantity included in the second configuration information; the terminal device determines the target cell and the target time period that meets the triggering condition of the predicted quantity corresponding to the target cell from the at least one first candidate cell based on the second prediction result; the terminal device reselects from the serving cell to the target cell during the target time period.

[0207] Exemplarily, the terminal device predicts a second prediction result including the identifier of at least one second candidate cell that meets the triggering condition for cell reselection and the time period that meets the triggering condition for cell reselection corresponding to at least one second candidate cell based on the predicted quantity, the starting condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, the triggering condition for the predicted quantity, and the triggering condition for cell reselection included in the second configuration information; the terminal device determines the target cell and the target time period that meets the triggering condition for cell reselection corresponding to the target cell from the at least one second candidate cell based on the second prediction result; the terminal device reselects from the serving cell to the target cell during the target time period.

[0208] The predicted amount in the embodiment of the present application takes an abnormal event as an example. Optionally, the predicted amount may also be that no abnormal event occurs, such as no RRC connection establishment failure occurs in the serving cell, no RRC connection recovery failure occurs in the serving cell, no RLF occurs after establishing an RRC connection with the serving cell / no RLF occurs quickly after establishing an RRC connection with the serving cell, no RRC connection establishment failure occurs in the neighboring area, no RRC connection recovery failure occurs in the neighboring area, no RLF occurs after establishing an RRC connection with the neighboring area / no RLF occurs quickly after establishing an RRC connection with the neighboring area, or other custom events do not occur; this application does not limit this.

[0209] The above describes the communication method provided in the embodiment of the present application. The following describes the execution entity used to execute the above communication method.

[0210] FIG9 is a schematic block diagram of a communication device 900 according to an embodiment of the present application. The device can be applied to a terminal device according to an embodiment of the present application. The communication device 900 includes:

[0211] The transceiver unit 910 is configured to receive first configuration information from a first access network device, where the first configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, where the predicted quantity includes one of the following abnormal events: a radio link failure RLF in a serving cell, a handover failure HOF in at least one neighboring cell, an RLF in the at least one neighboring cell, a ping-pong handover in the at least one neighboring cell, or an unnecessary handover in the at least one neighboring cell;

[0212] The processing unit 920 is configured to predict a first prediction result according to the first configuration information.

[0213] Optionally, the transceiver unit 910 is also used to send the first prediction result to the first access network device; the transceiver unit 910 is also used to receive a switching command from the first access network device, the switching command indicating switching to the target cell within a target time period, the at least one neighboring cell includes the target cell, and the at least one time period includes the target time period; the processing unit 920 is also used to switch from the serving cell to the target cell within the target time period according to the switching command.

[0214] Optionally, the processing unit 920 is further configured to:

[0215] Determine, based on the first prediction result, a target cell that satisfies the trigger condition of the predicted quantity and a target time period corresponding to the target cell that satisfies the trigger condition of the predicted quantity; or determine a target cell that satisfies the trigger condition of the handover and a target time period corresponding to the target cell that satisfies the trigger condition of the handover;

[0216] Handover is performed from the serving cell to the target cell within the target time period.

[0217] Optionally, the first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

[0218] Optionally, the starting conditions for predicting the predicted amount include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

[0219] Optionally, the triggering conditions for the predicted measurement include: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold.

[0220] Optionally, the triggering conditions for the switching include: a combination of the triggering conditions that satisfy the predicted quantities corresponding to one or more of the predicted quantities, or the weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or the weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

[0221] FIG10 is a schematic block diagram of a communication device 1000 according to an embodiment of the present application. The device can be applied to a first access network device according to an embodiment of the present application. The communication device 1000 includes:

[0222] The transceiver unit 1010 is configured to send first configuration information to the terminal device, where the first configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, where the predicted quantity includes one of the following abnormal events: RLF in the serving cell, HOF in at least one neighboring cell, RLF in the at least one neighboring cell, ping-pong switching in the at least one neighboring cell, or unnecessary switching in the at least one neighboring cell;

[0223] The transceiver unit 1010 is further configured to receive a first prediction result from the terminal device, where the first prediction result is predicted based on the first configuration information;

[0224] The transceiver unit 1010 is also used to send a switching command to the terminal device based on the first prediction result, where the switching command indicates switching to the target cell in a target time period, the at least one neighboring cell includes the target cell, and the at least one time period includes the target time period.

[0225] Optionally, the transceiver unit 1010 is specifically configured to:

[0226] Sending a handover request message to the second access network device, where the handover request message includes part or all of the first prediction result;

[0227] receiving a handover request confirmation message from the second access network device;

[0228] The switching command is sent to the terminal device, where the switching command includes indication information for instructing switching to the target cell within the target time period.

[0229] Optionally, the first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

[0230] Optionally, the starting conditions for predicting the predicted amount include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

[0231] Optionally, the triggering conditions for the predicted measurement include: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold.

[0232] Optionally, the triggering conditions for the switching include: a combination of the triggering conditions that satisfy the predicted quantities corresponding to one or more of the predicted quantities, or the weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or the weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

[0233] FIG11 is a schematic block diagram of a communication device 1100 according to an embodiment of the present application. The device can be applied to a terminal device according to an embodiment of the present application. The communication device 1100 includes:

[0234] The transceiver unit 1110 is configured to receive second configuration information from the first access network device, where the second configuration information includes at least one of a predicted amount, a start condition for predicting the predicted amount, at least one time period for predicting the predicted amount, a trigger condition for the predicted amount, or a trigger condition for cell reselection, and the predicted amount includes one of the following abnormal events: failure to establish a radio resource control RRC connection in a serving cell, failure to recover an RRC connection in the serving cell, RLF after establishing an RRC connection with the serving cell, failure to establish an RRC connection in at least one neighboring cell, failure to recover an RRC connection in at least one neighboring cell, or RLF after establishing an RRC connection with the at least one neighboring cell;

[0235] The processing unit 1120 predicts a second prediction result according to the second configuration information.

[0236] Optionally, the processing unit 1120 is further configured to:

[0237] Determining, based on the second prediction result, a target cell that satisfies the trigger condition of the predicted quantity and a target time period corresponding to the target cell that satisfies the trigger condition of the predicted quantity; or determining a target cell that satisfies the trigger condition of cell reselection and a target time period corresponding to the target cell that satisfies the trigger condition of cell reselection;

[0238] Reselect from the serving cell to the target cell within the target time period.

[0239] Optionally, the second prediction result includes: whether the abnormal event occurs or the probability of the abnormal event occurring or the probability of the abnormal event not occurring in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the cell reselection and the time period that meets the trigger condition of the cell reselection corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

[0240] Optionally, the starting conditions for predicting the predicted quantity include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

[0241] Optionally, the triggering conditions for the predicted measurement include: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold.

[0242] Optionally, the triggering conditions for cell reselection include: a combination of the triggering conditions satisfying the predicted quantities corresponding to one or more of the predicted quantities, or a weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or a weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold, or the weighted sum of the occurrence probabilities or non-occurrence probabilities corresponding to multiple of the predicted quantities is considered when calculating the R criterion / S criterion for cell reselection.

[0243] FIG12 is a schematic block diagram of a communication device 1200 according to an embodiment of the present application. The device can be applied to a first access network device according to an embodiment of the present application. The communication device 1200 includes:

[0244] The transceiver unit 1210 is used to send second configuration information to the terminal device, wherein the second configuration information includes a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or at least one of a trigger condition for cell reselection, and the predicted quantity includes one of the following abnormal events: failure to establish an RRC connection in the serving cell, failure to recover the RRC connection in the serving cell, RLF after establishing an RRC connection with the serving cell, failure to establish an RRC connection in at least one neighboring cell, failure to recover the RRC connection in at least one neighboring cell, or RLF after establishing an RRC connection with the at least one neighboring cell.

[0245] FIG13 is a schematic block diagram of another communication device 1300 according to an embodiment of the present application. The communication device 1300 includes: a processor 1310, a memory 1320, and a communication interface 1330;

[0246] The memory 1320 is used to store executable instructions;

[0247] The processor 1310 is coupled to the memory 1320 via the communication interface 1330. The processor 1310 is configured to call and execute the executable instructions in the memory 1320 to implement the method in the embodiment of the present application. The communication device can be applied to the first access network device or the second access network device in the embodiment of the present application. Optionally, the processor 1310 and the memory 1320 are integrated together.

[0248] The processor 1310 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the method embodiment described above may be completed by hardware integrated logic circuits within the processor or by software instructions. The processor may be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component. The methods, steps, and logic block diagrams disclosed in the embodiments of this application may be implemented or executed. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of this application may be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules within the decoding processor. The software module may be located in a storage medium known in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. The storage medium is located in a memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the method described above.

[0249] Optionally, an embodiment of the present application also provides a communication device, which includes an input and output interface and a logic circuit, wherein the input and output interface is used to obtain input information and / or output information; the logic circuit is used to execute the method in any of the above method embodiments, and process and / or generate output information based on the input information.

[0250] An embodiment of the present application also provides a communication system, comprising the terminal device and the first access network device in the above method embodiment.

[0251] The present application also provides a computer-readable storage medium storing a computer program for implementing the method in the above method embodiment. When the computer program is executed on a computer, the computer can implement the method in the above method embodiment.

[0252] An embodiment of the present application further provides a computer program product, which includes computer program code. When the computer program code runs on a computer, the method in the above method embodiment is executed.

[0253] An embodiment of the present application also provides a chip, including a processor, wherein the processor is connected to a memory, the memory is used to store computer programs, and the processor is used to execute the computer programs stored in the memory, so that the chip executes the method in the above method embodiment.

[0254] It should be understood that in the embodiments of the present application, the numbers "first", "second"... are only for distinguishing different objects, such as to distinguish different configuration information or different thresholds, and do not constitute a limitation on the scope of the embodiments of the present application. The embodiments of the present application are not limited to this.

[0255] In addition, the term "and / or" in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the previous and next associated objects are in an "or" relationship; the term "at least one" in this application can mean "one" and "two or more". For example, A, B and C can represent seven situations: A exists alone, B exists alone, C exists alone, A and B exist at the same time, A and C exist at the same time, C and B exist at the same time, and A, B and C exist at the same time.

[0256] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0257] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0258] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0259] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0260] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0261] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0262] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that: Applied to a terminal device, the method comprises: Receive first configuration information from a first access network device, the first configuration information including at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, the predicted quantity including one of the following abnormal events: a radio link failure RLF in a serving cell, a handover failure HOF in at least one neighboring cell, an RLF in the at least one neighboring cell, a ping-pong handover in the at least one neighboring cell, or an unnecessary handover in the at least one neighboring cell; A first prediction result is predicted according to the first configuration information.

2. The method according to claim 1, characterized in that The method further comprises: Sending the first prediction result to the first access network device; receiving a handover command from the first access network device, the handover command instructing handover to a target cell in a target time period, the at least one neighboring cell including the target cell, and the at least one time period including the target time period; According to the handover command, the serving cell is switched to the target cell in the target time period.

3. The method according to claim 1, characterized in that The method further comprises: Determine, according to the first prediction result, a target cell that satisfies the trigger condition of the predicted quantity and a target time period that satisfies the trigger condition of the predicted quantity corresponding to the target cell; or determine a target cell that satisfies the trigger condition of the switching and a target time period that satisfies the trigger condition of the switching corresponding to the target cell; Switching from the serving cell to the target cell during the target time period.

4. The method according to any one of claims 1 to 3, characterized in that The first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity respectively corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching respectively corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

5. The method according to any one of claims 1 to 4, characterized in that The starting conditions for predicting the predicted amount include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

6. The method according to any one of claims 1 to 5, characterized in that The triggering conditions for the predicted quantity include: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold.

7. The method according to any one of claims 1 to 6, characterized in that The triggering conditions for the switching include: a combination of the triggering conditions satisfying the predicted quantities corresponding to one or more of the predicted quantities, or a weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or a weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

8. A communication method, characterized in that: Applied to a first access network device, the method includes: Sending first configuration information to a terminal device, the first configuration information including at least one of a predicted quantity, a start condition for predicting the predicted quantity, predicting at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, wherein the predicted quantity includes one of the following abnormal events: RLF in a serving cell, HOF in at least one neighboring cell, RLF in the at least one neighboring cell, ping-pong switching in the at least one neighboring cell, or non-essential switching in the at least one neighboring cell; receiving a first prediction result from the terminal device, where the first prediction result is predicted according to the first configuration information; According to the first prediction result, a switching command is sent to the terminal device, where the switching command indicates switching to the target cell in a target time period.

9. The method according to claim 8, characterized in that The sending a switching command to the terminal device according to the first prediction result includes: Sending a handover request message to the second access network device, where the handover request message includes part or all of the first prediction result; Receiving a handover request confirmation message from the second access network device; The switching command is sent to the terminal device, where the switching command includes indication information for indicating switching to the target cell in the target time period.

10. The method according to claim 8 or 9, characterized in that: The first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity respectively corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching respectively corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

11. The method according to any one of claims 8 to 10, characterized in that The starting conditions for predicting the predicted amount include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

12. The method according to any one of claims 8 to 11, characterized in that The triggering conditions for the predicted quantity include: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold.

13. The method according to any one of claims 8 to 12, characterized in that The triggering conditions for the switching include: a combination of the triggering conditions satisfying the predicted quantities corresponding to one or more of the predicted quantities, or a weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or a weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

14. A communication device, characterized in that: include: A transceiver unit, configured to receive first configuration information from a first access network device, wherein the first configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, wherein the predicted quantity includes one of the following abnormal events: a radio link failure RLF in a serving cell, a handover failure HOF in at least one neighboring cell, an RLF in the at least one neighboring cell, a ping-pong handover in the at least one neighboring cell, or an unnecessary handover in the at least one neighboring cell; A processing unit is used to predict a first prediction result according to the first configuration information.

15. The device according to claim 14, characterized in that The transceiver unit is further configured to send the first prediction result to the first access network device; The transceiver unit is further configured to receive a handover command from the first access network device, wherein the handover command indicates handover to a target cell in a target time period; The processing unit is further configured to, according to the switching command, switch from the serving cell to the target cell in the target time period.

16. The device according to claim 14, characterized in that The processing unit is also used for: Determine, according to the first prediction result, a target cell that satisfies the trigger condition of the predicted quantity and a target time period that satisfies the trigger condition of the predicted quantity corresponding to the target cell; or determine a target cell that satisfies the trigger condition of the switching and a target time period that satisfies the trigger condition of the switching corresponding to the target cell; Switching from the serving cell to the target cell during the target time period.

17. The device according to any one of claims 14 to 16, characterized in that The first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity respectively corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching respectively corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

18. The device according to any one of claims 14 to 17, characterized in that The starting conditions for predicting the predicted amount include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

19. The device according to any one of claims 14 to 18, characterized in that The triggering conditions for the predicted quantity include: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold.

20. The device according to any one of claims 14 to 19, characterized in that The triggering conditions for the switching include: a combination of the triggering conditions satisfying the predicted quantities corresponding to one or more of the predicted quantities, or a weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or a weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

21. A communication device, characterized in that: include: A transceiver unit, configured to send first configuration information to a terminal device, wherein the first configuration information includes at least one of a predicted quantity, a start condition for predicting the predicted quantity, at least one time period for predicting the predicted quantity, a trigger condition for the predicted quantity, or a trigger condition for switching, wherein the predicted quantity includes one of the following abnormal events: RLF in a serving cell, HOF in at least one neighboring cell, RLF in the at least one neighboring cell, ping-pong switching in the at least one neighboring cell, or non-essential switching in the at least one neighboring cell; The transceiver unit is further configured to receive a first prediction result from the terminal device, where the first prediction result is predicted based on the first configuration information; The transceiver unit is further used to send a switching command to the terminal device according to the first prediction result, wherein the switching command indicates switching to the target cell in a target time period.

22. The device according to claim 21, characterized in that The transceiver unit is specifically used for: Sending a handover request message to the second access network device, where the handover request message includes part or all of the first prediction result; receiving a handover request confirmation message from the second access network device, The switching command is sent to the terminal device, where the switching command includes indication information for indicating switching to the target cell in the target time period.

23. The device according to claim 21 or 22, characterized in that The first prediction result includes: whether the abnormal event occurs or the probability of occurrence of the abnormal event or the probability of non-occurrence of the abnormal event in the at least one time period of the service cell and / or the at least one neighboring cell; or; the identifier of at least one first candidate cell that meets the trigger condition of the predicted quantity and the time period that meets the trigger condition of the predicted quantity respectively corresponding to the at least one first candidate cell; or; the identifier of at least one second candidate cell that meets the trigger condition of the switching and the time period that meets the trigger condition of the switching respectively corresponding to the at least one second candidate cell, wherein the service cell and the at least one neighboring cell include the at least one first candidate cell.

24. The device according to any one of claims 21 to 23, characterized in that The starting conditions for predicting the predicted amount include: a one-time prediction triggered by an event, a periodic prediction triggered by an event, or a periodic prediction not triggered by an event.

25. The device according to any one of claims 21 to 24, characterized in that The triggering conditions for the predicted quantity include: the abnormal event does not occur, or the probability of the abnormal event occurring is less than or equal to a first threshold, or the probability of the abnormal event not occurring is greater than or equal to a second threshold.

26. The device according to any one of claims 21 to 25, characterized in that The triggering conditions for the switching include: a combination of the triggering conditions satisfying the predicted quantities corresponding to one or more of the predicted quantities, or a weighted sum of the occurrence probabilities corresponding to multiple of the predicted quantities is less than or equal to a third threshold, or a weighted sum of the non-occurrence probabilities corresponding to multiple of the predicted quantities is greater than or equal to a fourth threshold.

27. A communication device, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to execute the computer program stored in the memory, so that the communication device executes the method according to any one of claims 1 to 13.

28. A communication device, characterized in that: include: Input-output interfaces and logic circuits; The input and output interface is used to obtain input information and / or output information; The logic circuit is used to execute the method according to any one of claims 1 to 13, and to process and / or generate the output information according to the input information.

29. A communication system, characterized in that: include: A terminal device and a first access network device, wherein the terminal device is used to implement the method described in any one of claims 1 to 7, and the first access network device is used to implement the method described in any one of claims 8 to 13.

30. A computer-readable storage medium, characterized in that: include: The computer readable medium stores a computer program; When the computer program is executed on a computer, the computer is caused to execute the method according to any one of claims 1 to 13.

31. A computer program product, characterized in that A computer program is included which, when executed, enables the method according to any one of claims 1 to 13 to be implemented.

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