WO2025256293A1 - 通信方法、终端、网络设备、计算机程序产品及存储介质 - Google Patents

通信方法、终端、网络设备、计算机程序产品及存储介质

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Publication number
WO2025256293A1
WO2025256293A1 PCT/CN2025/092492 CN2025092492W WO2025256293A1 WO 2025256293 A1 WO2025256293 A1 WO 2025256293A1 CN 2025092492 W CN2025092492 W CN 2025092492W WO 2025256293 A1 WO2025256293 A1 WO 2025256293A1
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WO
WIPO (PCT)
Prior art keywords
ltm
cho
information
communication method
timer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
PCT/CN2025/092492
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English (en)
French (fr)
Inventor
唐晓璇
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Honor Device Co Ltd
Original Assignee
Honor Device Co Ltd
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Filing date
Publication date
Application filed by Honor Device Co Ltd filed Critical Honor Device Co Ltd
Publication of WO2025256293A1 publication Critical patent/WO2025256293A1/zh
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a communication method, terminal, network device, computer program product, and storage medium.
  • a terminal when a terminal connects to a source cell, it can select a target cell from other candidate cells and switch from the source cell to the target cell. This handover process can be called cell handover or cell switching.
  • terminal cell handover schemes can include Layer 1/2 Triggered Mobility Management (LTM) and Conditional Handover (CHO).
  • LTM handover is based on Layer 1 and Layer 2 measurement results of the radio interface
  • CHO handover is based on Layer 3 measurement results.
  • the handover process (e.g., CHO and LTM) includes three phases: preparation, execution, and completion, with response sub-steps within each phase. Events are used to trigger measurement reporting or handover execution.
  • This application provides a communication method, terminal, network device, computer program product, and storage medium to solve the technical problem that when a terminal is configured with both LTM and CHO cell handover schemes, there may be a conflict between the two handover schemes, resulting in poor efficiency of cell handover for the terminal.
  • a communication method is provided, applied to a terminal (User Equipment, UE) or a functional module or chip within the UE.
  • This application uses the application of this communication method to a UE as an example for illustration.
  • the method includes: the UE acquiring first information, which instructs the terminal to perform a Layer 1/Layer 2 triggered Mobility Management (LTM) or Conditional Handover (CHO).
  • LTM Layer 1/Layer 2 triggered Mobility Management
  • CHO Conditional Handover
  • the communication method provided in this embodiment allows the UE to select to execute CHO or LTM based on the first information when CHO and LTM are configured, so as to select different handover schemes under different handover scenarios or service requirements, effectively avoid handover conflicts caused by the coexistence of two handover schemes, and improve cell handover efficiency.
  • the first information obtained by the UE can be sent to the UE by the network device, or it can be pre-configured within the UE's communication module or communication protocol, or it can be specified by the protocol, without restriction. Based on this possible design, multiple implementation forms of the first information are designed, which are flexible, diverse, and expand the application scenarios.
  • the first information can directly instruct the UE to perform LTM or directly instruct the UE to perform CHO.
  • the first information can also instruct the UE to perform handover selection-related information, such as priority, bias value, waiting time, handover selection rules, and basis parameters, thereby indirectly instructing the UE to perform LTM or CHO through these handover selection-related parameters.
  • the first information is designed to have the function of directly or indirectly instructing the handover method, offering flexibility and expanding application scenarios.
  • the LTM performed by the UE may include LTM based on network device indication, or it may include event-triggered LTM or Condition Layer 1/2 Triggered Mobility Management (CLTM).
  • LTM based on network device indication optimizes latency performance and improves service continuity.
  • Event-triggered CLTM reduces handover latency and improves handover efficiency.
  • the UE may also receive configuration information sent by the network device.
  • This configuration information is used to configure both CHO and LTM for the UE simultaneously.
  • the CHO and LTM configuration information may be sent simultaneously or separately, without restriction.
  • the UE configures CHO based on the CHO configuration parameters.
  • the UE configures LTM based on the LTM configuration parameters.
  • reconfiguration information includes the initial information, CHO configuration parameters, and LTM configuration parameters.
  • the UE can configure CHO based on the CHO configuration parameters in this reconfiguration information, and configure LTM based on the LTM configuration parameters.
  • the UE selects to execute either LTM or CHO based on the initial information, switching from the source cell to the target cell. This approach saves signaling overhead.
  • the method may further include: the UE reporting indication information, which may include or be used to indicate that the UE performs LTM or CHO, and/or a configuration index.
  • the event report may indicate that the cell handover performed by the UE is LTM or CHO
  • the configuration index may indicate that the UE is handovering to an LTM candidate cell included in the LTM configuration or a CHO candidate cell included in the CHO configuration.
  • the indication information reported by the UE may include event reporting of the UE performing the CHO and/or configuration index.
  • the indication information reported by the UE may include event reporting of the UE performing the LTM and/or configuration index.
  • the UE may report the indication information to the source access network device corresponding to the source cell when it starts handover and the connection with the source cell is not broken, or the UE may report the indication information to the target access network device corresponding to the target cell after the handover is successfully performed.
  • the UE can report the cell handover to the network-side equipment so as to synchronize the cell handover mode with the network-side equipment and ensure the accuracy of the cell handover.
  • the first information includes a first duration, which is the duration of a first timer.
  • the UE does not immediately trigger a measurement to determine whether the relevant entry conditions for LTM are met after receiving the L1 measurement result. Instead, it starts the first timer when the L1 measurement result is received, and waits for a period of time before selecting to trigger a measurement to determine whether the relevant entry conditions for LTM are met.
  • the UE when the UE assesses that the execution conditions for LTM are met, it will not immediately trigger the execution of LTM. Instead, it will start a first timer when the execution conditions for LTM are met. After the first timer runs for a period of time, that is, after waiting for a period of time or waiting for the first timer to expire, it will choose to execute LTM or CHO.
  • the UE when the UE assesses whether the execution conditions for LTM are met, it will not immediately trigger the execution of LTM. If the LTM candidate cell that meets the execution conditions for LTM is a CHO candidate cell, the UE will start a first timer first when assessing whether the execution conditions for LTM are met. After the first timer runs for a period of time, that is, after waiting for a period of time or waiting for the first timer to expire, the UE will choose between LTM and CHO.
  • LTM or CHO is executed depending on whether the execution conditions of CHO are met: if the execution conditions of CHO are met during the first timer operation, then CHO is executed; or, if the execution conditions of CHO are not met during the first timer operation, then LTM is executed.
  • This time period can be less than or equal to the first duration.
  • the first duration can be the trigger duration (Time To Trigger, TTT) of the LTM's trigger event.
  • the UE when the UE receives the L1 measurement result, it starts the first timer or runs the TTT of LTM. If the UE does not meet the execution conditions of CHO during the first timer's operation or during the TTT of LTM, the UE will execute LTM after the TTT expires. Alternatively, if the UE meets the execution conditions of CHO within the TTT of LTM, the UE will start executing CHO without waiting for the first timer to expire or executing LTM.
  • the UE can delay or postpone the execution of LTM by measuring the relevant entry conditions of LTM or delaying the execution of LTM, so as to achieve the purpose of prioritizing the execution of CHO.
  • the first information includes a second duration, which is the duration of a second timer.
  • the UE does not immediately begin executing LTM upon meeting the execution conditions of LTM and the relevant entry conditions of CHO. Instead, it starts the second timer first when the execution conditions of LTM are met, and waits for a period of time before selecting to execute either LTM or CHO.
  • LTM or CHO is executed based on whether the relevant exit conditions of CHO are met. If the relevant exit conditions of CHO are met during the second timer's operation, and the execution conditions of LTM are continuously met, LTM is executed when the relevant exit conditions of CHO are met. Alternatively, if the relevant exit conditions of CHO are not met during the second timer's operation, LTM is executed after the second timer expires.
  • the second duration can be less than the trigger duration TTT of the CHO trigger event.
  • the UE initiates the Time To Time (TTT) for the Choo (CHO) when the relevant entry conditions are met, and starts a second timer when the execution conditions for the LTM (Least Than Time) are met.
  • TTT Time To Time
  • LTM Least Than Time
  • the LTM is executed.
  • the LTM is executed after the second timer expires.
  • the UE can delay or postpone the execution of LTM by delaying the execution of LTM, thereby achieving the goal of prioritizing the execution of CHO.
  • the first information is used to indicate or include a cell change command, which instructs the terminal to perform LTM.
  • the cell change command may include a Media Access Control Element (MAC CE), a command sent by the network device to the UE.
  • MAC CE Media Access Control Element
  • the UE can determine whether it meets the execution conditions for a Choice of Health (CHO) based on its own measurement results and decide whether to execute the CHO. If the UE receives a cell change command from the network device while determining whether it meets the relevant entry conditions for the CHO, and the cell change command instructs the UE to execute Level Measure (LTM), the UE will not immediately execute LTM based on the cell change command, nor will it immediately determine whether it meets the relevant execution conditions for the CHO. Instead, it will first report a second piece of information to the network device to synchronize the UE's current status of meeting the relevant entry conditions for the CHO. After reporting the second piece of information to the network device, the UE waits for further instructions from the network device before choosing to execute LTM or the CHO.
  • LTM Choice of Health
  • the UE if it receives a cell handover command instructing to perform LTM within the TTT period that meets the relevant entry conditions of CHO, it will send a second message to the network device and wait for further instructions from the network device.
  • the UE can start a third timer when reporting the second information.
  • the UE Upon receiving a cell handover command instructing the UE to perform LTM, if the UE currently meets the relevant entry conditions for CHO, it reports the second information to the network device and starts the third timer. The UE can then begin performing LTM after the third timer expires.
  • the UE after reporting the second information, can receive a cell handover command or cell handover indication sent by the network device, and perform LTM or CHO based on the cell handover command or cell handover indication sent by the network device.
  • the UE receives a first instruction
  • the first instruction is used to instruct the execution of the CHO.
  • the UE can begin to assess whether the execution conditions of the CHO are met. If the relevant execution conditions of the CHO are met, the UE can begin to execute the CHO.
  • the second instruction is used to instruct the execution of LTM.
  • the UE can begin to assess whether the execution conditions of LTM are met. If the relevant execution conditions of LTM are met, the UE can begin to execute LTM.
  • the UE can also start another timer. During the timer's execution, if the UE receives the first indication, it executes a CHOD based on the first indication. Alternatively, if the UE receives the second indication during the timer's execution, it executes a LTM based on the second indication. Or, if the UE does not receive either the first or second indication during the timer's execution, it can execute an LTM after the timer expires.
  • the UE when the UE receives a cell handover command from the network device instructing the UE to execute LTM, the UE first reports the second information to the network device to synchronize the UE's status as meeting the relevant entry conditions for CHO, and then waits for further instructions from the network device. By delaying the execution of LTM as instructed by the cell handover command, the effect of prioritizing the triggering of CHO is achieved.
  • the first information is used to indicate or include a cell change command, which instructs the terminal to execute a CHO.
  • the cell change command may include a Media Access Control Element (MAC CE), a command sent by the network device to the UE.
  • MAC CE Media Access Control Element
  • the UE can determine whether it meets the LTM execution conditions based on its own measurement results and decide whether to execute LTM. If the UE receives a cell change command from the network device while determining whether it meets the relevant LTM entry conditions, and the cell change command instructs the UE to execute a CHO, the UE will not immediately execute the CHO based on the cell change command, nor will it immediately determine whether it meets the relevant LTM execution conditions. Instead, it will first report a second piece of information to the network device to synchronize the UE's current status of meeting the relevant LTM entry conditions with the network device. After reporting the second piece of information to the network device, the UE waits for further instructions from the network device before choosing to execute either a CHO or LTM.
  • the UE if it receives a cell handover command instructing to perform CHO during the TTT when the relevant entry conditions of LTM are met, it will send a second message to the network device and wait for further instructions from the network device.
  • the UE can start a third timer when reporting the second information.
  • a cell handover command instructing the UE to execute a CHO (Cell Handover Notice)
  • LTM Low-Terminal Memory
  • the UE can receive a cell handover command or cell handover indication sent by the network device, and perform CHO or LTM based on the cell handover command or cell handover indication sent by the network device.
  • the first indication is used to instruct the execution of LTM.
  • the UE can begin to assess whether the execution conditions of LTM are met. If the relevant execution conditions of LTM are met, the UE can begin to execute LTM.
  • the second instruction is used to instruct the execution of the CHO.
  • the UE can begin to assess whether the execution conditions of the CHO are met. If the relevant execution conditions of the CHO are met, the UE can begin to execute the CHO.
  • the UE can also start another timer. During the timer's execution, if the UE receives the first indication, it performs LTM based on the first indication. Alternatively, if the UE receives the second indication during the timer's execution, it performs CHO based on the second indication. Or, if the UE does not receive either the first or second indication during the timer's execution, it can perform CHO after the timer expires.
  • the UE when the UE receives a cell handover command from the network device instructing the UE to execute a Call for Handover (CHO), the UE first reports a second piece of information to the network device to synchronize the UE's status as meeting the relevant entry conditions for LTM, while awaiting further instructions from the network device. By delaying the execution of the CHO indicated by the cell handover command, the effect of prioritizing the triggering of LTM is achieved.
  • CHO Call for Handover
  • the UE when the UE measures that the execution conditions of CHO are met, it will not immediately trigger the execution of CHO. Instead, it will start a first timer when the execution conditions of CHO are met. After the first timer runs for a period of time, that is, after waiting for a period of time or waiting for the first timer to expire, it will choose to execute CHO or LTM.
  • the UE can delay or postpone the execution of the CHO by delaying the measurement of the relevant entry conditions of the CHO or delaying the execution of the CHO, so as to achieve the purpose of prioritizing the execution of LTM.
  • the first information includes a second duration, which is the duration of a second timer.
  • the UE does not immediately start executing CHO when the execution conditions of CHO and the relevant entry conditions of LTM are met. Instead, it starts the second timer first when the execution conditions of CHO are met, and waits for a period of time after the second timer runs before selecting to execute CHO or LTM.
  • the UE initiates the Time To Time (TTT) of LTM when the relevant entry conditions of LTM are met, and starts a second timer when the execution conditions of the Choice of Good (CHO) are met.
  • TTT Time To Time
  • CHO Choice of Good
  • the UE executes the CHO when the relevant exit conditions of LTM are met.
  • the CHO is executed after the second timer expires.
  • the first information includes or is used to indicate the priority of LTM and/or the priority of CHO, and the UE decides whether to perform LTM or CHO based on the priority.
  • the priorities of LTM and CHO indicated by the first information may be different to avoid handover conflicts caused by the UE performing LTM and CHO simultaneously.
  • the first message indicates that a high priority is configured for a CHO and a low priority is configured for an LTM.
  • the first message instructs the UE to execute the high-priority handover scheme or instructs the UE to execute the CHO.
  • the first message indicates that a first priority is configured for a CHO and a second priority is configured for an LTM, with the first priority being higher than the second priority.
  • the first message instructs the UE to execute the first-priority handover scheme or instructs the UE to execute the CHO.
  • the UE prioritizes executing the CHO, and the first message may only configure a priority for the CHO, without configuring a priority for the LTM. If the CHO has a priority, but the LTM does not, the first message may also instruct the UE to execute a handover scheme with a priority, or instruct the UE to execute the CHO.
  • the first message indicates that a low priority is configured for a CHO and a high priority is configured for an LTM.
  • the first message instructs the UE to execute the high-priority handover scheme or instructs the UE to execute LTM.
  • the first message indicates that the first priority is configured for LTM and the second priority is configured for CHO, with the first priority being higher than the second priority.
  • the first message instructs the UE to execute the first-priority handover scheme or instructs the UE to execute LTM.
  • the UE prioritizes LTM, and the first message may only configure a priority for LTM, without configuring a priority for CHO.
  • LTM may have a priority, while CHO may not.
  • the first message may also instruct the UE to execute a handover scheme with a priority, or instruct the UE to execute LTM.
  • the UE Based on the priority of LTM and the priority of CHO indicated by the first information, if the priority of LTM is higher than the priority of CHO, the UE assesses whether the execution conditions of LTM are met, or if the execution conditions of both CHO and LTM are met, the UE performs LTM and selects a low-latency, high-continuity cell handover scheme.
  • the first information includes or is used to indicate the bias value of LTM and/or the bias value of CHO.
  • the bias value associated with LTM is used by the terminal to measure whether the execution conditions of LTM are met.
  • the bias value associated with CHO is used by the terminal to measure whether the execution conditions of CHO are met. After the UE measures whether the corresponding execution conditions are met based on the bias value, it can select the preferred handover scheme according to the satisfaction of the execution conditions of these two types of handover schemes.
  • the LTM performed by the UE may include LTM based on network device indication or CLTM based on event triggering.
  • LTM based on network device indication optimizes latency performance and improves service continuity.
  • CLTM based on event triggering reduces handover latency and improves handover efficiency.
  • the network device may send configuration information to the UE, which is used to configure both CHO and LTM for the UE simultaneously.
  • the specific implementation scheme for the UE receiving the configuration information sent by the network device can be referred to the first aspect, and will not be repeated here.
  • the first information includes a first duration, which is the duration of a first timer.
  • the UE will not immediately trigger the measurement of whether the relevant entry conditions for a CHO are met.
  • the UE measures whether the execution conditions for a CHO are met it will not immediately trigger the execution of the CHO. Instead, it will first start the first timer, wait for a period of time, and then choose to trigger the measurement of whether the relevant entry conditions for a CHO are met, or wait for a period of time before choosing to execute the CHO or LTM.
  • the specific implementation scheme for the UE to trigger or start executing the CHO based on the first duration can be referred to the first aspect and will not be repeated here.
  • the first information includes a second duration, which is the duration of a second timer.
  • the UE is configured with a Call for Action (CHO) and a Time-Based Transaction (LTM).
  • CHO Call for Action
  • LTM Time-Based Transaction
  • the UE does not immediately begin executing the CHO. Instead, it first starts the second timer and waits for a period before selecting to execute either the CHO or the LTM. This delayed CHO trigger achieves the effect of prioritizing the LTM.
  • the specific implementation scheme for the UE to trigger or begin executing the CHO based on the second duration can be referred to in the first aspect and will not be elaborated further.
  • the first information is used to indicate or include a cell handover command.
  • the UE receives a cell handover command instructing the execution of a Call for Handover (CHO) if the relevant entry conditions for LTM are met, the UE sends the second information to the network device, waits for further instructions from the network device, and then chooses to execute either the CHO or LTM.
  • CHO Call for Handover
  • the UE achieves the effect of prioritizing the triggering of LTM.
  • the specific implementation scheme for the UE reporting the second information based on the cell handover command can be referred to the first aspect and will not be repeated here.
  • this application provides a communication method applied to a communication system, which includes a network device and a terminal.
  • the network device sends first information to the terminal; the first information is used to instruct the terminal to trigger a Layer 1 or Layer 2 Mobility Management (LTM) or Conditional Handover (CHO) event.
  • LTM Layer 1 or Layer 2 Mobility Management
  • CHO Conditional Handover
  • the terminal executes the LTM or CHO according to the first information.
  • this application provides a terminal, which includes a communication module, a memory, and a processor, both of which are coupled to the processor.
  • the memory stores computer-executable instructions
  • the processor executes the computer-executable instructions stored in the memory, causing the electronic device to perform the communication method as described in any of the first aspects.
  • this application provides a computer-readable storage medium storing a computer program that, when run on a computer, causes the computer to perform a communication method as described in any one of the first to third aspects.
  • Figure 1 is a schematic diagram of an architecture for a mobile communication system
  • Figure 2 is a layered diagram of the wireless protocol stack
  • Figure 3 is a signaling diagram of cell handover based on LTM
  • Figure 4 is a signaling diagram of cell handover based on CHO
  • FIG. 5 is a flowchart illustrating a communication method provided in an embodiment of this application.
  • Figure 7 is a schematic diagram of the UE performing LTM or CHO based on a first duration in the communication method provided in the embodiments of this application;
  • Figure 9 is another schematic diagram of the UE performing LTM or CHO based on a second duration in the communication method provided in the embodiments of this application;
  • Figure 11 is a schematic diagram of the UE performing LTM or CHO based on MAC CE, first indication and second indication in the communication method provided in the embodiments of this application;
  • Figure 12 is a schematic diagram of a communication device used in the communication method provided in the embodiments of this application.
  • Figure 13 is a schematic diagram of another structure of the communication device used in the communication method provided in the embodiments of this application.
  • Figure 14 is another structural schematic diagram of the communication device used in the communication method provided in the embodiments of this application.
  • a terminal is an entity on the user side used to receive or transmit signals, for sending uplink signals to network devices or receiving downlink signals from network devices.
  • a terminal can be a User Equipment (UE), Mobile Station (MS), or Mobile Terminal (MT), including handheld devices, in-vehicle devices, wearable devices, computing devices, or sensing devices with wireless communication capabilities.
  • UE User Equipment
  • MS Mobile Station
  • MT Mobile Terminal
  • a terminal can be a mobile phone, tablet computer, or computer with wireless transceiver capabilities; it can also be a Virtual Reality (VR) terminal, Augmented Reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a smart home (e.g., a smart speaker), an in-vehicle terminal, a train detector, etc.
  • VR Virtual Reality
  • AR Augmented Reality
  • a wireless terminal in industrial control e.g., a wireless terminal in autonomous driving
  • a wireless terminal in telemedicine e.g., a wireless terminal in a smart grid
  • a wireless terminal in a smart city e.g., a smart home (e.g., a smart speaker), an in-vehicle terminal, a train detector, etc.
  • the device used to implement the terminal's functions can be the terminal itself, or a device capable of supporting the terminal in implementing those functions, such as a chip system (e.g., a single chip, or a processing system composed of multiple chips) or a modem.
  • a chip system e.g., a single chip, or a processing system composed of multiple chips
  • a modem e.g., a modem
  • a network device is a network-side device that provides a mobile communication network. Within the coverage area of the mobile communication network provided by the network device, one or more UEs can access the mobile communication network and achieve communication.
  • the network device is used to receive uplink signals from the UE or send downlink signals to the UE to realize functions such as UE resource scheduling, radio resource management, and radio access control. It is a device in the Radio Access Network (RAN) that connects the UE to the wireless network.
  • the RAN can be connected to the core network (e.g., it can be the core network of LTE or the core network of 5G).
  • the network equipment can be an evolved Node B (eNB or eNodeB) in LTE, a base station in a 5G network or a future evolved Public Land Mobile Network (PLMN), a base station supporting unilateral transmission (e.g., an uplink-only TRP or Asymmetric TRP that supports uplink transmission but not downlink transmission), a Broadband Network Gateway (BNG), an aggregation switch, or a non-3GPP access device; or the network equipment in the embodiments of this application can also be a cloud radio access network.
  • eNB evolved Node B
  • PLMN Public Land Mobile Network
  • the wireless controller in a Cloud Radio Access Network (CRAN); or a Transmission and Reception Point (TRP), or a device including a TRP, etc. are not specifically limited in this application embodiment.
  • the network device in this application embodiment may include various forms of base stations, such as macro base stations, micro base stations (also known as small stations), relay stations, access points, etc., which are not specifically limited in this application embodiment.
  • the means for implementing the function of the network device may be the network device itself, or it may be a means that enables the network device to implement the function, such as a chip system (e.g., a chip, or a processing system composed of multiple chips) or a modem.
  • a chip system e.g., a chip, or a processing system composed of multiple chips
  • Mobile communication systems can primarily include Long Term Evolution (LTE) systems, Global System for Mobile Communication (GSM), 5th Generation (5G) systems, post-5G communication systems, and New Radio Access Technology (NR) systems.
  • LTE Long Term Evolution
  • GSM Global System for Mobile Communication
  • 5G 5th Generation
  • NR New Radio Access Technology
  • mobile communication systems can also include Universal Mobile Telecommunications System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) systems, UMTS Terrestrial Radio Access Network (UTRAN) systems, and GSM EDGE Radio Access Network (GERAN) systems.
  • UMTS Universal Mobile Telecommunications System
  • WiMAX Worldwide Interoperability for Microwave Access
  • UTRAN UMTS Terrestrial Radio Access Network
  • GERAN GSM EDGE Radio Access Network
  • the V2X system can include vehicle-to-network (V2N) systems, vehicle-to-vehicle (V2V) systems, vehicle-to-infrastructure (V2I) systems, vehicle-to-pedestrian (V2P) systems, Long Term Evolution-Vehicle (LTE-V) systems, vehicle-to-everything (V2X) systems, machine-type communication (MTC) systems, Internet of Things (IoT) systems, Long Term Evolution-Machine (LTE-M) systems, and machine-to-machine (M2M) systems, etc., without limitation.
  • V2N vehicle-to-network
  • V2V vehicle-to-vehicle
  • V2I vehicle-to-infrastructure
  • V2P vehicle-to-pedestrian
  • LTE-V Long Term Evolution-Vehicle
  • V2X vehicle-to-everything
  • MTC machine-type communication
  • IoT Internet of Things
  • LTE-M Long
  • FIG. 1 shows a schematic diagram of a mobile communication system architecture.
  • the mobile communication system can include access network equipment and UEs (User Equipment).
  • Access network equipment can include base stations, eNBs, and gNBs.
  • the following example primarily uses gNBs as the access network equipment.
  • ue1-ue5 are connected to gNB1, and ue6 and ue7 are connected to gNB2.
  • the mobile communication system shown in Figure 1 also includes cells Cell1, Cell2, and Cell3.
  • a cell also known as a cellular unit, refers to the area covered by one access network device or a portion of an access network device (sector antenna) in a cellular mobile communication system.
  • the UE can communicate with the access network device via a radio channel.
  • the access network device gNB1 covers Cell1 and Cell2, and gNB2 covers Cell3.
  • ue1 and ue2 can communicate with gNB1 via a radio channel.
  • Within Cell2, ue3, ue4, and ue5 can communicate with gNB1 via a radio channel.
  • Within Cell3, ue6 and ue7 can communicate with gNB2 via a radio channel.
  • the cell or access network device connected to the UE is not fixed.
  • the UE can perform cell handover to communicate with different cells and access network devices.
  • Cell handover can include intra-cell mobility and inter-cell mobility.
  • Intra-cell mobility refers to a connected UE switching from one cell of an access network device to another cell of the same access network device, with the entire handover process taking place within the same access network device.
  • Inter-cell mobility refers to a connected UE switching from one cell of one access network device to another cell of another access network device.
  • LTM Layer 1/2 Triggered Mobility Management
  • CHO Conditional Handover
  • Layer 1/2 also known as Layer 1/2, L1/L2, etc.
  • LTM, or LTM handover is based on measurements of Protocol Layer 1 and Protocol Layer 2 via the radio interface as shown in Figure 2.
  • CHO, or CHO handover is based on measurements of Protocol Layer 3.
  • the terms CHO and CHO handover can be used interchangeably, both referring to cell changes triggered by Protocol Layer 3 measurements.
  • LTM and LTM handover can refer to cell changes triggered by the UE based on Protocol Layer 1 and Protocol Layer 2 measurements, or cell changes triggered by UE network commands.
  • the wireless protocol stack is divided into two planes: the user plane (UP) and the control plane (CP).
  • the user plane protocol stack contains the protocol suite used for user data transmission, while the control plane protocol stack contains the protocol suite used for system control signaling transmission.
  • the user plane protocol stack from top to bottom, includes: Non-Access Stratum (NAS) layer, Packet Data Convergence Contocol (PDCP) layer, Broadcast/Multicast Control (BMC) layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer, and Physical (PHY) layer.
  • NAS Non-Access Stratum
  • PDCP Packet Data Convergence Contocol
  • BMC Broadcast/Multicast Control
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • the control plane protocol stack includes: Non-Access Stratum (NAS) layer, Radio Resource Contocol (RRC) layer, Packet Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, Medium Access Control (MAC) layer, and Physical (PHY) layer.
  • NAS Non-Access Stratum
  • RRC Radio Resource Contocol
  • PDCP Packet Data Convergence Protocol
  • RLC Radio Link Control
  • MAC Medium Access Control
  • PHY Physical
  • the control plane protocol stack is located within the UE on the UE side.
  • RRC, PDCP, RLC, MAC, and PHY are located within the access network devices, while NAS is located in the Access and Mobility Management Function (AMF) of the core network.
  • AMF Access and Mobility Management Function
  • L1 primarily includes the wireless physical channel used to provide transmission for higher-layer services, i.e., the Physical Layer (PHY).
  • L2 includes four layers: MAC, RLC, BMC, and PDCP.
  • L3 includes the RRC layer and NAS layer in the access layer, such as the CC (Call Control) and MM (Mobility Management) layers in NAS.
  • the UE's execution of LTM as instructed by the network device may include: based on multiple LTM candidate cells configured by the network device, the UE obtains measurement results for each LTM candidate cell (which can be referred to as the L1 measurement results for each LTM candidate cell) and reports them to the network device. Based on the L1 measurement results reported by the UE, the network device continuously triggers the mobility management mechanism using handover commands carried by MAC CE. The handover command can be used to instruct the UE to hand over from the source cell to the target cell. Optionally, before sending the handover command to the UE, the network device may also trigger the UE to perform downlink and uplink synchronization.
  • the execution conditions of LTM can include whether the relevant triggering events of LTM are met, such as whether the decision inequality corresponding to event A3 is satisfied.
  • the execution conditions of LTM can include: the relevant entry conditions of LTM and the relevant exit conditions of LTM.
  • the relevant entry condition for LTM refers to the trigger duration TTT of the triggering event that satisfies the inequality for entering the event and continues to LTM.
  • the inequality for the triggering event to enter LTM is: Mn + Ofn + Ocn - Hys > Ms + Ofs + Ocs + Off.
  • the UE satisfies the relevant leave conditions of LTM, meaning that the UE meets the inequality for the leave conditions of the triggering event.
  • the inequality for the leave conditions of the triggering event is: Mn + Ofn + Ocn + Hys ⁇ Ms + Ofs + Ocs + Off.
  • Mn represents the Reference Signal Received Power (RSRP) of the neighboring cell
  • Ofn represents the frequency offset of the neighboring cell, configured in the neighboring cell list of the serving cell, and its value is 0 during intra-frequency handover.
  • Ocn represents the Cell Individual Offset, which is set in the neighboring cell list of the serving cell.
  • Ms represents the RSRP of the serving cell.
  • Ofs represents the frequency offset of the serving cell, and its value is 0 during intra-frequency handover.
  • Hys represents the A3 event hysteresis value, which is in the serving cell parameters.
  • Ocs represents the Cell Specific Offset of the serving cell, defined in the cell attribute parameters as cellIndividualOffset(Ocs), generally used for load handover and usually not used.
  • Off is the A3 event offset value, which is in the serving cell parameters. Increasing the values of Hys and Off increases the handover difficulty, while decreasing them makes it easier.
  • the communication equipment involved in LTM includes UE and network equipment gNB.
  • the network equipment is divided into source cell gNB and candidate cell gNB.
  • the candidate cell gNB can be further divided into target cell gNB and access network equipment other than the access network equipment corresponding to the target cell, referred to as potential access network equipment or candidate access network equipment.
  • the source cell can also be called the serving cell, which refers to the cell where the UE is currently camped or the cell where it camped before the handover.
  • the access network equipment corresponding to the source cell can refer to the source access network equipment.
  • the target cell can be the cell where the UE camps after the cell handover, and the access network equipment corresponding to the target cell can refer to the target access network equipment.
  • the access network equipment mentioned in this application can be a base station or a next-generation base station (gNB), etc.
  • conditional LTM or event-based CLTM is introduced. This means that the UE performs LTM cell change based on an event trigger. The UE assesses whether the LTM execution conditions are met and decides to start LTM execution if the conditions are met.
  • LTM refers to the UE triggering cell handover based on the network device's indication, combined with the L1 measurement results
  • CLTM refers to the UE independently assessing whether the LTM execution conditions are met based on the L1 measurement results, and starting LTM execution when the LTM execution conditions are met.
  • Figure 3 shows the main signaling interactions for cell handover based on LTM.
  • Figure 3 only retains the main communication equipment (UE), source cell gNB, and target cell gNB; the signaling interactions of other network devices are relatively few, and are only illustrated in text.
  • the UE performing LTM mainly includes the following process:
  • S301 The UE sends a measurement report to the source cell gNB.
  • the UE is in RRC connected state (UE in RRC_Connected) and accesses the source cell.
  • the UE interacts with the source cell gNB via signaling to enable the UE to hand over from the source cell to the target cell.
  • the process of a UE switching from the source cell to the target cell is mainly divided into four stages: LTM preparation, early synchronization, LTM handover execution, and LTM handover completion.
  • the source cell gNB determines that the UE meets the LTM triggering conditions, it makes an LTM handover decision and configures LTM candidate cells and other information for the UE. Furthermore, the source cell gNB can also communicate with the access network equipment corresponding to the LTM candidate cells to prepare for the handover process, which may include resource reservation and context information switching.
  • the UE receives the RRC reconfiguration message.
  • the RRC reconfiguration message instructs the UE to switch to the target cell.
  • the RRC reconfiguration message may include LTM candidate cell configuration information, particularly the target cell's configuration information.
  • the RRC reconfiguration message sent by the source cell gNB to the UE may also include measurement configuration information, such as information about the reference signal (Synchronization Signal Block, SSB) to be measured, the measurement period, and the report triggering conditions.
  • measurement configuration information such as information about the reference signal (Synchronization Signal Block, SSB) to be measured, the measurement period, and the report triggering conditions.
  • SSB Synchronization Signal Block
  • S303 The UE sends an RRC reconfiguration complete message to the source cell gNB.
  • the UE receives the RRC reconfiguration message from the source cell gNB, retrieves the configuration information of the LTM candidate cell or target cell, and stores it. The UE then sends an RRC reconfiguration complete message to the source cell gNB. This completes the LTM preparation phase and enters the early synchronization phase.
  • S304 The UE sends uplink synchronization signal and downlink synchronization signal.
  • the UE After receiving the RRC reconfiguration message, the UE performs a handover action, such as disconnecting from the source cell and attempting to access the target cell.
  • the UE also performs uplink synchronization (UL synchronization with LTM candidate cells) and downlink synchronization (DL synchronization with LTM candidate cells) with the target cell gNB.
  • the UE can also perform uplink and downlink synchronization with other candidate cell gNBs to reduce information delay after cell handover and achieve information synchronization.
  • S305 The UE reports the L1 measurement results to the source cell gNB.
  • the UE After completing uplink and downlink synchronization, the UE enters the LTM cell handover phase.
  • the UE performs L1 measurements and obtains the L1 measurement results.
  • the source cell gNB evaluates the quality of the radio signal based on the L1 measurement results and uses this as the basis for network handover decisions and adjustments to transmission parameters.
  • the UE When the RRC reconfiguration message sent by the source cell gNB to the UE includes measurement configuration information, the UE periodically or event-basedly measures relevant indicators of the received reference signals according to the measurement configuration information. If the measurement results obtained by the UE meet the preset reporting conditions, such as reaching a specific threshold or a specific event occurring, the UE generates a measurement report carrying the L1 measurement results and reports the measurement report to the source cell gNB.
  • the source cell gNB sends an LTM handover command to the UE.
  • the source cell gNB When the source cell gNB receives the measurement report reported by the UE, it can measure whether the LTM candidate cell meets the LTM execution conditions based on the L1 measurement results. If the LTM execution conditions are met, it will make a decision to perform LTM handover and issue an LTM handover command to the UE through RRC signaling, instructing the UE to perform LTM handover and switch from the source cell to the target cell.
  • the source cell gNB can send LTM handover instructions to the UE via the Medium Access Control (MCA) CE.
  • MCA Medium Access Control
  • the source cell gNB can also send LTM handover instructions to the UE through other methods; there are no limitations.
  • S307 The UE receives the LTM handover instruction and initiates random access to the gNB network device of the target cell.
  • a UE When a UE receives an LTM handover command from the source cell gNB, it can perform the handover process. For example, the UE can start the operation of Detach from source and request to apply target configurations.
  • the UE initiates a Random Access Channel (RACH) request to the target cell gNB, enabling the gNB to receive the UE's connection establishment message and confirm whether to accept the connection request.
  • RACH Random Access Channel
  • the target cell gNB Upon accepting the UE's connection request, the target cell gNB sends a connection establishment confirmation message to the UE, along with the resources and configuration information allocated to the UE by the target cell gNB. For example, the target cell gNB may send a random access response via the Physical Downlink Control Channel (PDCCH), including synchronization information and uplink grant.
  • PDCCH Physical Downlink Control Channel
  • the UE initiates random access to the target cell gNB to complete registration and resource allocation in the target cell. This completes the LTM handover for the UE, switching from the source cell to the target cell. The UE then ends the LTM cell handover execution phase and enters the LTM cell handover completion phase.
  • S308 The UE sends an RRC reconfiguration complete message to the target cell gNB.
  • the UE disconnects from the source cell and hands over to the target cell. After completing the random access procedure in the target cell, the UE sends an RRC reconfiguration completion message (LTM Cell Switch Completion) to the target cell gNB, instructing the UE to complete the LTM handover. Specifically, the UE can send RRC reconfiguration completion information to the target cell gNB.
  • RRC reconfiguration completion message LTM Cell Switch Completion
  • the target cell gNB After receiving the RRC reconfiguration complete message from the UE, the target cell gNB confirms that the UE has successfully switched to the target cell and is ready to transmit data. The target cell gNB sends a handover request to the core network to switch the user plane data path to the target cell. After confirming the successful handover of the user plane data path, the core network notifies the target cell gNB. After disconnecting from the UE, the source cell gNB can release the resources previously occupied by the UE.
  • UEs performing LTM cell handover can reduce handover downtime and service interruptions, optimizing latency performance. By reducing interruptions during the handover process, the continuity of real-time services such as voice and video calls is improved. It is suitable for ultra-reliable low-latency communication scenarios and supports the performance requirements of mission-critical services.
  • UE execution of a CHO refers to the process of a UE deciding whether to perform a cell handover based on multiple CHO candidate cells configured by the network device and the conditions met.
  • the process of a UE performing an LTM (Low-Terminal Memory) cell handover mainly involves three types of conditions: CHO-related triggering conditions, CHO-related entry conditions, and CHO-related execution conditions.
  • the UE must sequentially meet the CHO-related triggering conditions, CHO-related entry conditions, and CHO-related execution conditions before the CHO can begin.
  • the execution conditions for CHO can be referred to the aforementioned execution conditions for LTM, or the relevant provisions of relevant standards or communication protocols, and will not be elaborated further.
  • the communication equipment involved in CHO includes UE and network equipment gNB.
  • the network equipment is divided into source cell gNB and candidate cell gNB.
  • the candidate cell gNB can be further divided into target cell gNB and cell network equipment other than the target cell, referred to as potential cell gNB.
  • Figure 4 shows the main signaling interactions for cell handover based on CHO.
  • Figure 4 only retains the main communication equipment (UE), source cell gNB, and target cell gNB; the signaling interactions of other network devices are relatively few, and are only illustrated in text.
  • the UE completing CHO handover mainly includes the following process:
  • S401 The UE sends a measurement report to the source cell via gNB.
  • the UE is in RRC connected state (UE in RRC_Connected) and accesses the source cell.
  • the UE interacts with the source cell gNB via signaling to enable the UE to hand over from the source cell to the target cell.
  • the UE performs measurements on the current serving cell and its neighboring cells, obtains measurement results such as RSRP and RSRQ, obtains a measurement report based on the measurement results, and sends the measurement report to the source cell gNB.
  • measurement results such as RSRP and RSRQ
  • the source cell gNB sends RRC reconfiguration information to the UE.
  • the source cell gNB determines whether the relevant triggering conditions for a handover decision (CHO) are met based on the measurement results and other relevant information reported by the UE (such as network load and service quality requirements). Once the source cell gNB determines that the UE meets the CHO triggering conditions, it makes a CHO decision and configures the CHO for the UE, including configuring the CHO candidate cell (CHO Candidate Preparation) and other information.
  • the source cell gNB communicates with the candidate cell network devices, including the target cell network devices, to prepare for the handover process, mainly including resource reservation and context information switching.
  • the source cell gNB sends an RRC reconfiguration message to the UE, instructing the UE to reconfigure the CHO.
  • the RRC reconfiguration includes the configuration information of the CHO candidate cells, especially the configuration information of the target cell.
  • S403 The UE sends an RRC reconfiguration complete message to the source cell gNB.
  • the UE receives the RRC reconfiguration message sent by the source cell gNB, retrieves the configuration information of the CHO candidate cells, and stores it. The UE then sends an RRC reconfiguration complete message to the source cell gNB. This completes the CHO preparation phase.
  • S404 UE measures whether the execution conditions of CHO are met.
  • RRC reconfiguration information may also include execution conditions that the UE needs to meet to execute a CHO.
  • the execution conditions of a CHO may include the triggering event of the CHO.
  • the UE After receiving the CHO configuration, the UE begins to evaluate the execution conditions of the CHO for candidate cells based on signal quality, signal strength, time alignment, or other custom parameters, and executes the CHO when the conditions are met.
  • UE can automatically assess whether the execution conditions of CHO are met based on parameters such as measurement results, and start performing CHO handover if the execution conditions of CHO are met.
  • S405 The UE initiates a random access request to the target cell gNB.
  • the target cell gNB responds to the UE's random access request, allocates resources to the UE, and completes the CHO handover.
  • the UE determines to perform a CHO handover, begins to leave the source cell, and requests the application of target configurations.
  • the UE initiates a Random Access Channel (RACH) request to the target cell gNB, enabling the gNB to receive the UE's connection establishment message and confirm whether to accept the connection request.
  • RACH Random Access Channel
  • the target cell gNB Upon accepting the UE's connection request, the target cell gNB sends a connection establishment confirmation message to the UE, along with the resources and configuration information allocated to the UE by the target cell gNB. For example, the target cell gNB may send a random access response via the Physical Downlink Control Channel (PDCCH), including synchronization information and uplink grant.
  • PDCCH Physical Downlink Control Channel
  • the UE initiates a random access request to the target cell gNB to complete registration and resource allocation in the target cell. This completes the CHO handover, switching from the source cell to the target cell. The UE then ends the CHO handover phase and enters the LTM handover phase.
  • S407 The UE sends an RRC reconfiguration complete message to the target cell gNB.
  • the target cell gNB After receiving the RRC reconfiguration complete message from the UE, the target cell gNB confirms that the UE has successfully switched to the target cell and is ready to transmit data. The target cell gNB sends a handover request to the core network to switch the user plane data path to the target cell. After confirming the successful handover of the user plane data path, the core network notifies the target cell gNB. After disconnecting from the UE, the source cell gNB can release the resources previously occupied by the UE.
  • a UE When a UE performs a CHO handover, it can quickly respond and execute the handover when specific conditions are met, reducing its reliance on network handover commands and thus reducing handover latency and improving handover success rate.
  • the CHO handover mechanism is particularly suitable for high-speed mobile scenarios or areas at the edge of network coverage, where signal conditions may change rapidly.
  • the UE performs a CHO (Cell-House-Operated) handover, allowing it to trigger a handover automatically when specific conditions are met, reducing latency from waiting for network handover commands.
  • the handover conditions adopted by the UE can more flexibly respond to changes in the radio environment, improving handover success rate and network efficiency.
  • the UE can quickly respond to signal changes, making it suitable for high-speed mobility scenarios such as trains or cars.
  • a UE can configure both LTM and CHO simultaneously.
  • LTM and CHO coexist, conflicts may arise in the UE's execution of LTM and CHO.
  • the UE can obtain LTM candidate cells configured by the source cell's gNB. Based on the network instructions from the source cell's gNB, the UE performs LTM to handover to a target cell, which is one of the candidate cells in the LTM list. Simultaneously, the UE can also obtain CHO candidate cells configured by the source cell's gNB. The UE independently assesses whether the handover conditions for the target cell are met.
  • the UE hands over to the target cell which is also one of the candidate cells in the CHO list.
  • the target cell the UE hands over to during LTM execution may be the same as or different from the target cell the UE hands over to during CHO execution. If the cells being handed over to are different, handover conflicts will occur, resulting in poor handover efficiency.
  • this application provides a communication method that, when a terminal is simultaneously configured with both CHO and LTM, allows the terminal to receive first information and execute either CHO or LTM based on the first information, effectively resolving the technical problem of handover conflict between the two coexisting handover methods.
  • the LTM mentioned in this embodiment can be an LTM triggered by a network indication, or an LTM or CLTM triggered by a UE-measured event, and is not limited thereto.
  • FIG. 5 is a flowchart illustrating a communication method provided in this application. As shown in Figure 5, the communication method may include the following steps:
  • S501 UE obtains first information.
  • the first piece of information can be used to instruct the UE to perform LTM or CHO.
  • the first information may be sent to the UE by the network device, or it may be pre-configured, such as being pre-configured within the UE's communication module or communication protocol, or it may be specified by the protocol, without limitation.
  • the UE may obtain the first information upon its first network connection after leaving the factory, or the UE may obtain the first information after each power-on.
  • the UE may obtain the first information sent by the source cell gNB when accessing the source cell, or the UE may obtain the first information sent by the source cell gNB when the source cell has poor quality and needs to be replaced with a better serving cell.
  • the first information can directly instruct the UE to perform LTM or directly instruct the UE to perform CHO; or, the first information can instruct handover selection related information, such as indicating waiting time, handover selection rules, handover selection based on parameters, etc., and indirectly instruct the UE to perform LTM or CHO through the handover selection related information indicated by the first information.
  • handover selection related information such as indicating waiting time, handover selection rules, handover selection based on parameters, etc.
  • S502 The UE executes LTM or CHO based on the first information.
  • the UE executes either LTM or CHO handover scheme to switch from the source cell to the target cell.
  • LTM the target cell is one of the LTM candidate cells.
  • CHO the target cell is one of the CHO candidate cells.
  • the candidate cell evaluated by the UE may be configured with both CHO and LTM execution conditions; that is, the candidate cell is simultaneously an LTM candidate cell and a CHO candidate cell.
  • the first information is used to instruct the UE to choose to execute LTM or CHO. This means that the UE starts executing LTM or CHO, or the UE starts to measure whether the execution conditions of LTM or CHO are met. It does not mean that the UE will definitely be able to successfully hand over to the target cell by executing LTM or CHO.
  • the first information instructing the UE to perform a CHO may mean that the UE begins to measure whether the CHO execution conditions are met, or begins to perform a CHO handover after measuring whether the CHO execution conditions are met, but it is not limited to the UE being able to successfully hand over to the target cell in the CHO candidate cells.
  • the terminal can acquire first information each time a target cell handover is required, immediately determine a handover plan based on the first information, and execute the determined handover plan.
  • the first information acquired by the terminal can be used only for handover decisions in the current cell handover scenario.
  • the terminal may not immediately perform a cell handover after receiving the first information. Instead, the terminal will execute LTM or CHO based on this first information each time a cell handover is required subsequently. In other words, the first information obtained by the terminal can be reused for handover decisions in multiple cell handover scenarios.
  • the UE uses CHO (Cell Handover Notice) for cell handover, allowing it to trigger handover automatically when specific conditions are met, reducing latency from waiting for network handover commands.
  • the UE uses LTM (Low-Temperature Notice) for cell handover, which reduces handover downtime and service interruptions, optimizing latency performance. By reducing interruptions during handover, the continuity of real-time services such as voice and video calls is improved.
  • Configuring CHO and LTM allows the UE to use different cell handover schemes in different scenarios, and the first information is used to select between CHO and LTM, avoiding potential handover conflicts.
  • the UE can also report indication information.
  • This indication information may include or be used to instruct the UE to perform LTM or CHO, including event reporting and/or configuration indexes.
  • Event reporting may indicate the type or identifier of the triggering event corresponding to LTM, or the type or identifier of the triggering event corresponding to CHO.
  • the configuration index may be the index or identifier of the LTM candidate cell configured for the LTM performed by the UE, or the index or identifier of the CHO candidate cell configured for the CHO performed by the UE.
  • the indication information reported by the UE may include event reporting of the UE performing the CHO and/or configuration index.
  • the indication information reported by the UE may include event reporting of the UE performing the LTM and/or configuration index.
  • the first information may also report event reports and/or indexes of handover schemes not executed by the UE.
  • the indication information reported by the UE may include event reports and/or configuration indexes of the UE not executing a LTM.
  • the indication information reported by the UE may include event reports and/or configuration indexes of the UE executing a CHO.
  • the UE may report indication information to the source cell gNB when handover begins and while the connection with the source cell remains open.
  • the UE may report indication information to the target cell gNB after successful handover.
  • the UE can also receive configuration information sent by the network device.
  • This configuration information is used to configure both CHO and LTM for the UE simultaneously.
  • a single configuration file can be used, including both CHO and LTM configuration parameters, thus saving signaling overhead.
  • multiple configuration files can be used, including both CHO and LTM configuration information, to differentiate configuration information for different handover methods.
  • the CHO and LTM configuration information can be sent simultaneously or separately, without restriction.
  • the UE configures the CHO based on its configuration parameters.
  • the UE configures the LTM based on its configuration parameters.
  • reconfiguration information includes the initial information, CHO configuration parameters, and LTM configuration parameters.
  • the UE can configure CHO based on the CHO configuration parameters in this reconfiguration information, and configure LTM based on the LTM configuration parameters.
  • the UE selects to execute either LTM or CHO based on the initial information, switching from the source cell to the target cell. This approach saves signaling overhead.
  • the communication method provided in this embodiment allows the UE to select different handover schemes under different handover scenarios or service requirements when both CHO and LTM are configured.
  • the UE selects to execute either CHO or LTM based on the first information, effectively avoiding handover conflicts caused by the coexistence of the two handover schemes and improving cell handover efficiency.
  • the communication devices involved may include the UE and the network device gNB.
  • the network device includes the source cell gNB, the target cell gNB corresponding to LTM, and the target cell gNB corresponding to CHO.
  • Figure 6 shows the main signaling interaction diagram for cell handover based on the first information.
  • the main interaction signaling is illustrated in text only.
  • the UE completing cell handover mainly includes the following process:
  • S601 The UE sends a measurement report to the source cell gNB.
  • the UE is in RRC connected state (UE in RRC_Connected) and accesses the source cell.
  • the UE interacts with the source cell gNB via signaling to enable the UE to hand over from the source cell to the target cell.
  • the UE performs measurements on the current serving cell and its neighboring cells, obtaining L1 measurement results for LTM candidate cells and L3 measurement results for CHO candidate cells.
  • the UE can also obtain parameters such as Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ), and include these measurement results in a measurement report, which is then sent to the source cell gNB.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • the source cell gNB receives the measurement report and sends reconfiguration information to the UE.
  • the source cell gNB can configure CHO candidate cells and LTM candidate cells for the UE based on the measurement results and other relevant information reported by the UE (such as network load, service quality requirements, etc.).
  • the source cell gNB sends reconfiguration information to the UE, which may include CHO configuration parameters and LTM configuration parameters. It may also include thresholds for performing CHO handover and LTM handover.
  • the configuration parameters for CHO include information about the CHO candidate cells, while the configuration parameters for LTM include information about the LTM candidate cells.
  • the descriptions of the CHO and LTM configuration parameters are as described above and will not be repeated here.
  • the first message instructs the UE to perform LTM or CHO.
  • the source cell gNB will also communicate with the CHO target cell gNB and the LTM target cell gNB to prepare for the UE to hand over the cell.
  • the preparation operations involved may mainly include resource reservation, context information switching, etc.
  • the source cell gNB may also send reconfiguration information, including CHO configuration parameters and LTM configuration parameters, to the UE separately, as well as send the first information separately.
  • the source cell gNB may also send reconfiguration information, including CHO configuration parameters, and LTM configuration parameters, to the UE separately, and send the first information separately.
  • the source cell gNB may also send reconfiguration information to the UE separately or in combination using other information combinations, without limitation.
  • S603 The UE receives the reconfiguration information and sends an RRC reconfiguration completion message to the source cell gNB.
  • the UE receives the RRC reconfiguration message from the source cell gNB, retrieves the LTM and CHO configuration parameters, and obtains and stores the configuration information of the candidate cells for LTM and CHO. The UE then sends an RRC reconfiguration complete message to the source cell gNB. This completes the CHO and LTM preparation phases.
  • S604 The UE decides whether to execute CHO or LTM based on the first information.
  • the UE decides to execute LTM, and executes S605A, S606A and S607A.
  • S605A The UE initiates a random access request to the LTM target cell gNB.
  • S606A The gNB of the LTM target cell responds to the UE's random access request, allocates resources to the UE, and completes the LTM handover.
  • S607A The UE sends an RRC reconfiguration complete message to the gNB of the LTM target cell.
  • the UE determines to perform LTM, begins the process of Detach from source, and applies target configurations.
  • the UE initiates a Random Access Channel (RACH) request to the LTM target cell gNB, enabling the gNB to receive the UE's connection establishment message and confirm whether to accept the connection request.
  • RACH Random Access Channel
  • the gNB Upon accepting the UE's connection request, the gNB sends a connection establishment confirmation message to the UE, carrying with it the resources and configuration information allocated to the UE by the gNB. For example, the gNB may send a random access response via the Physical Downlink Control Channel (PDCCH), including synchronization information and uplink grant.
  • PDCCH Physical Downlink Control Channel
  • the UE initiates random access to the LTM target cell gNB in order to complete registration and resource allocation in the target cell. In this way, the UE completes the LTM handover, switching from the source cell to the LTM target cell.
  • the UE decides to execute CHO, and executes S605B, S606B and S607B.
  • S605B The UE initiates a random access request to the target cell gNB of the CHO.
  • S606B The gNB of the target cell for CHO responds to the UE's random access request, allocates resources to the UE, and completes the CHO handover.
  • S607B The UE sends an RRC reconfiguration complete message to the gNB of the target cell CHO.
  • the UE determines to perform a CHO handover, begins to leave the source cell, and requests the application of CHO target configurations.
  • the UE initiates random access to the CHO target cell gNB, enabling the CHO target cell gNB to receive the UE's connection establishment message and confirm whether to accept the connection request.
  • the CHO target cell gNB Upon accepting the UE's connection request, the CHO target cell gNB sends a connection establishment confirmation message to the UE, carrying with it the resources and configuration information allocated to the UE by the CHO target cell gNB.
  • the CHO target cell gNB sends a random access response via the Physical Downlink Control Channel (PDCCH), including synchronization information and uplink grant.
  • PDCCH Physical Downlink Control Channel
  • the UE initiates random access to the gNB of the CHO target cell in order to complete registration and resource allocation in the target cell. In this way, the UE completes the CHO handover, switching from the source cell to the target cell.
  • the first information can directly instruct the UE to perform LTM or directly instruct the UE to perform CHO; or, the first information can instruct handover selection-related information, such as waiting time, handover selection rules, and handover selection-related information based on parameters, so as to indirectly instruct the UE to perform LTM or CHO through the handover selection-related information indicated by the first information.
  • handover selection-related information such as waiting time, handover selection rules, and handover selection-related information based on parameters, so as to indirectly instruct the UE to perform LTM or CHO through the handover selection-related information indicated by the first information.
  • This allows the UE to determine whether to perform LTM or CHO based on the instruction of the first information when CHO and LTM are configured for it, thereby avoiding potential handover conflicts and improving cell handover efficiency.
  • the following will describe the process of the UE performing LTM or CHO based on the first information, using several embodiments, focusing on the types of information that the first information may include:
  • the first information is used to indicate or include the duration of the timer.
  • the first information is used to indicate or include a duration that can be used to configure the duration of the timer.
  • the timer can be used to delay triggering one switching mode and prioritize triggering the other switching mode.
  • the timer can be used to delay triggering LTM and prioritize triggering CHO; or, the timer can be used to delay triggering CHO and prioritize LTM.
  • the specific function of the timer can be specified by the protocol or pre-configured and is not limited.
  • the UE communicates with network devices based on a communication protocol.
  • the communication protocol used by the UE specifies that the UE selects to execute either LTM or CHO based on the first piece of information.
  • the first information the UE receives includes the timer duration.
  • the communication protocol applied by the UE can specify the start and end conditions of the timer.
  • the relevant communication rules of the communication protocol can instruct the UE to prioritize triggering a Change-On (CHO). Based on this, the timer can be used to delay triggering a Stop-In-Time (LTM) to achieve priority triggering of the CHO. Alternatively, the relevant communication rules of the communication protocol can instruct the UE to prioritize triggering an LTM. Based on this, the timer can be used to delay the CHO to achieve priority triggering of the LTM.
  • the start and end conditions of the timer differ depending on the type of handover indicated by the communication protocol.
  • UE prioritizes executing CHO.
  • the UE prioritizes the execution of CHO, which can also be understood as the UE delaying the triggering of LTM.
  • the first information includes a first duration, which is the duration of a first timer.
  • the start conditions for the first timer include: the UE obtaining the L1 measurement result or the UE meeting the LTM execution conditions. That is, the first timer is started when the UE obtains the L1 measurement result or the UE meets the LTM execution conditions.
  • the UE is configured with LTM and CHO. After obtaining the L1 measurement result, the UE will not immediately trigger the measurement to determine whether the relevant entry conditions of LTM are met. Alternatively, when the UE measures whether the execution conditions of LTM are met, it will not immediately trigger the execution of LTM. Instead, it will start the first timer and wait for a period of time (which can be called the first waiting time). After that, it will end the wait and then choose to trigger the measurement to determine whether the relevant entry conditions of LTM are met, or choose to execute LTM or CHO.
  • the first timer is triggered when the UE meets the LTM execution conditions and the LTM candidate cell that meets the LTM execution conditions is a CHO candidate cell.
  • the UE can trigger the first timer when the LTM execution conditions are met, delaying the LTM trigger and starting a wait. After a waiting period (which can be called the first waiting time), the UE can then choose to trigger the evaluation to determine whether the relevant LTM entry conditions are met, or wait for a period of time before choosing to execute LTM or CHO.
  • the first waiting time can be less than or equal to the first duration, meaning the actual waiting time of the UE is not necessarily the first duration.
  • the UE's waiting time may be less than the duration of the first timer; the UE may end its waiting before the first timer expires (i.e., during the first timer's operation) and begin triggering the measurement of whether the relevant entry conditions for LTM are met, or begin selecting to execute LTM or CHO.
  • the UE's waiting time may be equal to the duration of the first timer; that is, the UE ends its waiting after the first timer expires and begins triggering the measurement of whether the relevant entry conditions for LTM are met, or begins selecting to execute LTM or CHO.
  • the UE can determine whether to end the waiting based on whether the end condition of the first timer is met.
  • the termination condition of the first timer includes: if the execution condition of CHO is met during the operation of the first timer, then CHO is executed to end/stop the timer; or, if the execution condition of CHO is not met during the operation of the first timer, then LTM is executed to end/stop the timer.
  • the UE After the UE starts the first timer, it begins to measure whether the execution conditions of the CHO are met. If, during the first timer's operation, the UE measures that the candidate cell meets the CHO execution conditions, then the CHO can be executed when the CHO execution conditions are met. In this case, the UE does not need to wait for the first timer to expire, and the UE's actual waiting time (e.g., the first waiting time) is less than the first duration.
  • the UE's actual waiting time e.g., the first waiting time
  • the UE can execute LTM. Specifically, the UE can start executing LTM after the first timer expires or at the time of expiration. In this case, the UE's actual waiting time is equal to the first timer duration.
  • the first duration indicated by the first information can be the trigger duration (Time To Trigger, TTT) of the LTM trigger event. That is, when the UE receives the L1 measurement result, it starts the first timer. If the UE does not meet the execution conditions of the Choo (Cancel) within the TTT of the LTM, the UE will execute the LTM after waiting for the TTT. If the UE meets the execution conditions of the Choo within the TTT of the LTM, the UE will start executing the Choo without waiting for the first timer to expire or executing the LTM.
  • TTT Time To Trigger
  • the UE when the UE performs L1 measurements corresponding to LTM, it measures that beam 1 of candidate cell cell 1 meets the execution conditions, but beam 1 of cell 1 is configured with L3 execution conditions corresponding to CHO. In this case, when the UE determines that the LTM execution conditions are met based on the L1 measurement results, it starts the first timer.
  • the first timer can be the target handover duration (TTT) within the CHO execution conditions, or a waiting time equal to the TTT.
  • TTT target handover duration
  • CHO is executed. If the UE's L3 measurement result still does not meet the execution conditions of CHO after the first timer expires, then LTM is executed.
  • Figure 7 illustrates the UE executing LTM or CHO based on a first duration.
  • the UE obtains the L1 measurement result at t0 or meets the execution conditions of LTM, it starts the first timer.
  • the duration of the first timer is the first duration T10, which can be the TTT of LTM.
  • the UE can start executing CHO.
  • the actual waiting time T11 of the UE is less than the first time T10.
  • LTM will be executed when the first timer expires (t2).
  • the actual waiting time T12 of the UE is equal to the first time T10.
  • the scheme provided in this example includes a first duration of a first timer, which can be the TTT (Time To Time) of LTM (Level 1 Module).
  • the UE starts the first timer when it receives the L1 measurement result or meets the LTM execution conditions. After waiting for a period of time, it executes either LTM or CHO (Confirmation of Hazardous Module) based on whether the CHO execution conditions are met. By delaying the triggering or initiation of LTM, the UE achieves the technical effect of prioritizing CHO execution.
  • the first information includes a second duration, which is the duration of a second timer.
  • the start conditions for the second timer include: the UE meeting the relevant entry conditions of CHO and the execution conditions of LTM.
  • the UE is configured with LTM and CHO.
  • the execution conditions of LTM and the relevant entry conditions of CHO are met, the UE does not immediately start executing LTM, but first starts a second timer, and waits for a period of time before choosing to execute LTM or CHO.
  • the UE can start a second timer when the relevant entry conditions of the CHO are met.
  • the duration of the second timer is the TTT of the CHO trigger event.
  • the UE measures whether the execution conditions of the LTM are met, and starts the second timer if the execution conditions of the LTM are met.
  • the second duration of the second timer can be less than the TTT of the CHO.
  • the UE starts a second timer to wait when the execution conditions of LTM are met.
  • the actual waiting time of the UE may or may not be equal to the second timer.
  • the UE determines whether to end the waiting based on whether the termination condition of the second timer is met.
  • the termination condition of the second timer includes: if the relevant exit condition of CHO and the execution condition of LTM are met during the operation of the second timer, then LTM is executed.
  • the UE configures a second timer T_w, the duration of which can be less than the TTT within the CHO execution conditions. If the UE meets the relevant CHO entry conditions and the LTM execution conditions, then T_w is started. If the relevant CHO exit conditions are met within T_w and the L1 measurement result still meets the LTM execution conditions, then LTM is executed. If the L1 measurement result consistently meets the LTM execution conditions within T_w, then LTM is executed after T_w times out.
  • the UE when the UE meets the relevant entry conditions of CHO at t0, it starts a timer with a duration equal to the TTT of CHO. During the TTT of CHO, the UE measures whether the execution conditions of LTM are met. If the UE meets the execution conditions of LTM at t1, the UE starts a second timer with a duration of T20, which is less than the TTT of CHO. The end time t3 of the second timer is earlier than the end time t4 of the TTT of CHO.
  • the UE measures whether the candidate cell meets the relevant leave conditions of CHO. If, before the second timer expires, the UE measures that it meets the relevant leave conditions of CHO at t2, and the UE also continues to meet the execution conditions of LTM, the UE stops waiting and begins to execute LTM. In this case, the actual waiting time of the UE is T21, and T21 is less than T20.
  • the UE measures whether the candidate cell meets the relevant leave conditions for CHO. If the UE still does not meet the relevant leave conditions for CHO when the second timer expires (t3), but continues to meet the execution conditions for LTM, the UE will execute LTM after the second timer expires. In this case, the UE's actual waiting time is T22, which is equal to T20.
  • the UE can start executing LTM (Low Time To Time) when the CHO's TTT expires.
  • LTM Low Time To Time
  • the UE can also wait for the second timer to expire before starting to execute LTM.
  • the communication method provided in this example allows the UE to start a second timer during TTT operation after satisfying the relevant entry conditions of CHO, after measuring whether the execution conditions of LTM are met, measure whether the relevant exit conditions of CHO are met during the operation of the second timer, and start executing LTM when the relevant exit conditions of CHO are met or when the second timer times out.
  • the termination condition of the second timer includes: if the execution condition of LTM is met during the operation of the second timer, LTM is executed after the second timer expires.
  • the UE measures whether the execution conditions of LTM are met. If the UE meets the execution conditions of LTM at t1, the UE starts a second timer.
  • the duration of the second timer T20 is less than the TTT of CHO, and the end time t2 of the second timer is earlier than the end time t3 of CHO's TTT.
  • the UE assesses whether the candidate cell meets the execution conditions for LTM. If the UE assesses that the candidate cell continuously meets the execution conditions for LTM during the second timer period, LTM will be executed after the second timer expires, i.e., t2. In this case, the UE's actual waiting time T22 is equal to T20.
  • the UE can start executing LTM when the TTT of the CHO expires.
  • the UE can also wait for the second timer to expire before starting to execute LTM.
  • the communication method provided in this example involves the UE starting a second timer during TTT operation after satisfying the CHO-related entry conditions, after measuring whether the LTM execution conditions are met, measuring whether the LTM execution conditions are continuously met during the operation of the second timer, and starting LTM execution when the second timer times out if the LTM execution conditions are continuously met.
  • the UE prioritizes LTM execution.
  • the UE prioritizes LTM, which can also be understood as the UE delaying the triggering of CHO.
  • the first information includes a first duration, which is the duration of a first timer.
  • the start conditions for the first timer include: the UE obtaining the L3 measurement result or the UE meeting the execution conditions of the CHO. That is, the first timer is started when the UE obtains the L3 measurement result or the UE meets the execution conditions of the CHO.
  • the UE is configured with CHO and LTM. After obtaining the L3 measurement result, the UE will not immediately trigger the measurement of whether the relevant entry conditions of CHO are met. Alternatively, when the UE measures whether the execution conditions of CHO are met, it will not immediately trigger the execution of CHO. Instead, it will start the first timer and wait for a period of time (which can be called the first waiting time). After that, it will end the wait and then choose to trigger the measurement of whether the relevant entry conditions of CHO are met, or choose to execute CHO or LTM.
  • the first timer is triggered when the UE meets the CHO execution conditions and the CHO candidate cell that meets the CHO execution conditions is also an LTM candidate cell.
  • the UE can trigger the first timer when the L3 measurement result meets the CHO execution conditions, delaying the CHO trigger and starting a wait. After a waiting period (which can be called the first waiting time), the UE can then choose to trigger a measurement to determine whether the relevant entry conditions for CHO are met, or wait for a period of time before choosing to execute CHO or LTM.
  • the first waiting time can be less than or equal to the first duration, meaning the actual waiting time of the UE is not necessarily the first duration.
  • the UE's waiting time may be less than the duration of the first timer; the UE may end its waiting before the first timer expires (i.e., during the first timer's operation) and begin triggering the assessment of whether the relevant entry conditions for a CHO are met, or begin selecting to execute a CHO or LTM.
  • the UE's waiting time may be equal to the duration of the first timer; that is, the UE ends its waiting after the first timer expires and begins triggering the assessment of whether the relevant entry conditions for a CHO are met, or begins selecting to execute a CHO or LTM.
  • the UE can determine whether to end the waiting based on whether the end condition of the first timer is met.
  • the termination condition of the first timer includes: if the execution condition of LTM is met during the operation of the first timer, then LTM is executed to end/stop the timer; or, if the execution condition of LTM is not met during the operation of the first timer, then CHO is executed to end/stop the timer.
  • the UE After the UE starts the first timer, it begins to measure whether the execution conditions for LTM are met. If, during the first timer's operation, the UE measures that the candidate cell meets the LTM execution conditions, then LTM can be executed when the LTM execution conditions are met. In this case, the UE does not need to wait for the first timer to time out, and the UE's actual waiting time (e.g., the first waiting time) is less than the first duration.
  • the UE's actual waiting time e.g., the first waiting time
  • the UE can execute a CHO. Specifically, the UE can start executing the CHO after the first timer expires or at the time of expiration. In this case, the UE's actual waiting time is equal to the first timer duration.
  • the first duration indicated by the first information can be the trigger duration (Time To Trigger, TTT) of the CHO trigger event. That is, when the UE receives the L3 measurement result, it starts the first timer. If the UE does not meet the LTM execution conditions within the CHO's TTT, the UE will execute the CHO after waiting for the TTT. If the UE meets the LTM execution conditions within the CHO's TTT, the UE will begin executing LTM without waiting for the first timer to expire or executing the CHO.
  • TTT Time To Trigger
  • the UE when the UE performs L3 measurements corresponding to a CHO (Common Hazard of Occurrence), it measures that beam 1 of candidate cell celL3 meets the execution conditions, but beam 1 of celL3 is configured with L1 execution conditions corresponding to LTM (Least Than Measure).
  • LTM Least Than Measure
  • the UE determines that the CHO execution conditions are met based on the L3 measurement results, it starts a first timer.
  • the first timer can be the target handover duration TTT within the LTM execution conditions, or a waiting duration equivalent to TTT.
  • LTM is executed. If the UE's L1 measurement result still does not meet the execution conditions of LTM after the first timer expires, then CHO is executed.
  • Figure 7 illustrates the UE executing CHO or LTM based on a first duration.
  • the UE obtains the L3 measurement result at t0 or meets the execution conditions of CHO, it starts the first timer.
  • the duration of the first timer is the first duration T10, which can be the TTT of CHO.
  • the UE can start executing LTM.
  • the actual waiting time T11 of the UE is less than the first time T10.
  • the scheme provided in this example includes a first duration of a first timer, which can be the TTT of a Chohack-on-the-Go (CHO).
  • the UE starts the first timer when it receives the L3 measurement result or meets the execution conditions of the Chohack-on-the-Go (CHO). After waiting for a period of time, it executes either the Chohack-on-the-Go (CHO) or the LTM based on whether the execution conditions of the LTM are met.
  • the UE achieves the technical effect of prioritizing the execution of the LTM.
  • the first information includes a second duration, which is the duration of a second timer.
  • the start conditions for the second timer include: the UE meeting the relevant entry conditions of LTM and the execution conditions of CHO.
  • the UE is configured with CHO and LTM.
  • the execution conditions of CHO and the relevant entry conditions of LTM are met, the UE does not immediately start executing CHO, but first starts a second timer, and waits for a period of time before choosing to execute CHO or LTM.
  • the UE can start a second timer when the relevant entry conditions of LTM are met.
  • the duration of the second timer is the TTT of the LTM trigger event.
  • the UE measures whether the execution conditions of CHO are met, and starts the second timer if the execution conditions of CHO are met.
  • the second duration of the second timer can be less than the TTT of LTM.
  • the UE starts a second timer to wait when the execution condition of the CHO is met.
  • the actual waiting time of the UE may or may not be equal to the second timer.
  • the UE determines whether to end the waiting based on whether the termination condition of the second timer is met.
  • the UE configures a second timer T_w, the duration of which can be less than the TTT within the LTM execution conditions. If the UE meets the relevant LTM entry conditions, and the subsequent L3 measurement result meets the CHO execution conditions, then T_w is initiated. If the relevant LTM exit conditions are met within T_w and the L3 measurement result still meets the CHO execution conditions, then CHO is executed. If the L3 measurement result consistently meets the CHO execution conditions within T_w, then CHO is executed after T_w times out.
  • the UE when the UE meets the relevant entry conditions of LTM at t0, it starts a timer with a duration equal to the TTT of LTM. During the TTT of LTM, the UE checks whether the execution conditions of CHO are met. If the UE meets the execution conditions of CHO at t1, the UE starts a second timer with a duration of T20, which is less than the TTT of LTM. The end time t3 of the second timer is earlier than the end time t4 of the TTT of LTM.
  • the UE measures whether the candidate cell meets the relevant leave conditions of LTM. If, before the second timer expires, the UE measures that it meets the relevant leave conditions of LTM at t2, and the UE also continues to meet the execution conditions of CHO, the UE stops waiting and begins to execute CHO. In this case, the actual waiting time of the UE is T21, and T21 is less than T20.
  • the UE determines that the candidate cell does not meet the relevant leave conditions of LTM. If the UE still does not meet the relevant leave conditions of LTM when the second timer expires (t3), but continues to meet the execution conditions of CHO, the UE will execute CHO after the second timer expires. In this case, the actual waiting time of the UE is T22, and T22 is equal to T20.
  • the communication method provided in this example is that during the TTT operation after the relevant entry conditions of LTM are met, the UE starts a second timer after measuring whether the execution conditions of CHO are met. During the operation of the second timer, it measures whether the relevant exit conditions of LTM are met, and starts to execute CHO when the relevant exit conditions of LTM are met or when the second timer times out.
  • the termination condition of the second timer includes: if the execution condition of CHO is met during the operation of the second timer, CHO is executed after the second timer expires.
  • the UE measures whether the execution conditions of CHO are met. If the UE meets the execution conditions of CHO at t1, the UE starts a second timer.
  • the duration of the second timer T20 is less than the TTT of LTM, and the end time t2 of the second timer is earlier than the end time t3 of the TTT of LTM.
  • the UE measures whether the candidate cell meets the execution conditions of the CHO. If the UE measures that the candidate cell continuously meets the execution conditions of the CHO during the second timer operation, the CHO will be executed after the second timer expires, i.e., t2. In this case, the UE's actual waiting time T22 is equal to T20.
  • the communication method provided in this example is that during the TTT operation after the LTM-related entry conditions are met, the UE starts a second timer after measuring whether the execution conditions of the CHO are met. During the operation of the second timer, it measures whether the execution conditions of the CHO are continuously met. If the execution conditions of the CHO are continuously met, the CHO is executed when the second timer expires.
  • Example 2 The first information is used to indicate or include a cell handover command, which is used to instruct the terminal to perform LTM or CHO.
  • the UE can select LTM or CHO based on the assessment that the candidate cell meets the entry conditions and the cell handover command sent by the network device.
  • the cell handover command may include MAC CE, which can instruct the UE to perform LTM or instruct the UE to perform CHO.
  • the UE can choose to perform LTM or CHO based on the handover method determined by its own measurement results and the handover method indicated by MAC CE. If the handover method determined by its own measurement results is the same as the handover method indicated by MAC CE, then that handover method is selected. Otherwise, if they are different, the handover method indicated by MAC CE is not directly followed, but information indicating the handover method currently met by the UE is fed back so that the network device can further indicate the handover method.
  • the UE can determine whether the relevant entry conditions for a Choll-Obtaining Decision (CHO) or an Execution Decision (LTM) are met based on its own measurement results, and then begin measuring the corresponding execution conditions. If the relevant entry conditions for a CHO are met, the UE can decide independently whether to begin measuring the execution conditions for that CHO, and execute the CHO if the execution conditions are met. Alternatively, the UE can also decide independently to begin measuring the LTM if the relevant entry conditions for the LTM are met.
  • CHO Choll-Obtaining Decision
  • LTM Execution Decision
  • the UE receives a MAC CE from the network device instructing it to perform LTM, but the UE currently meets the relevant entry conditions for CHO and is capable of performing CHO; or, if the UE receives a MAC CE from the network device instructing it to perform CHO, but the UE currently meets the execution conditions for LTM and is capable of performing LTM.
  • the UE can report a second piece of information to notify the network device of the handover type it currently meets.
  • UE prioritizes executing CHO.
  • the UE when the UE receives a MAC CE, if the relevant entry conditions or execution conditions of the CHO are met, it reports second information.
  • the second information is used to indicate or include that the terminal meets the relevant entry conditions or execution conditions of the CHO.
  • the UE When the UE receives a MAC CE instruction from the network device, instructing the UE to perform LTM, if the UE already meets the relevant entry or execution conditions of a CHO, the UE can first report a second piece of information to the network device to await further instructions from the network device before choosing to perform LTM or CHO, instead of directly starting LTM based on the MAC CE. If the UE does not meet the relevant entry or execution conditions of a CHO when receiving the MAC CE, it will perform LTM.
  • the UE meets the relevant entry conditions for CHO at t0 and initiates the TTT of CHO.
  • the UE receives an instruction from the network device to perform MAC CE of LTM, the UE can report the second information to the network device.
  • the network device can report to a second device to directly perform LTM.
  • the UE Upon receiving a MAC CE instruction from the network device to perform LTM, and after determining that the relevant entry conditions or execution conditions of the CHO are met, the UE reports a second device to the network device. Afterwards, the UE can perform LTM or CHO according to the relevant provisions of the communication protocol.
  • the UE can start a third timer when reporting the second information, and execute LTM after the third timer expires.
  • the UE receives a MAC CE indicating the execution of LTM at time t1 and starts a third timer.
  • the duration of the third timer is T30, and its timeout time t2 can be earlier than the end time of the TTT of the CHO.
  • the UE measures whether the execution conditions of LTM are continuously met. If the execution conditions of LTM are continuously met, the UE can start executing LTM at the timeout of the second timer, i.e., t2. In this case, the actual waiting time T31 of the UE is equal to the third duration T30. The UE waits for T31 before starting to execute LTM, thus achieving the effect of prioritizing the triggering of HCO.
  • the UE when the UE receives a MAC CE instructing it to perform LTM, it starts a third timer. If the UE currently meets the relevant entry conditions of CHO, the UE will wait for a third time period after receiving the MAC CE instructing it to perform LTM before starting to perform LTM.
  • the UE after reporting the second information, can also receive a MAC CE sent by the network device to perform LTM or CHO.
  • the UE receives a first instruction
  • the first instruction is used to instruct the execution of the CHO.
  • the UE can begin to assess whether the execution conditions of the CHO are met. If the relevant execution conditions of the CHO are met, the UE can begin to execute the CHO.
  • the second instruction is used to instruct the execution of LTM.
  • the UE can begin to assess whether the execution conditions of LTM are met. If the relevant execution conditions of LTM are met, the UE can begin to execute LTM.
  • the UE can also limit itself to receiving the first or second indication only within the TTT of the CHO or during the operation of the third timer before executing the corresponding handover scheme.
  • the UE within the TTT of the CHO, the UE starts a third timer at t1. During the operation of the third timer, if the UE receives the first instruction at t4, it directly begins executing the CHO. If the UE receives the second instruction at t5, it directly begins executing the LTM. If the UE does not receive either the first or second instruction during the operation of the third timer, it begins executing the LTM at t2. It should be noted that receiving the first instruction, receiving the second instruction, and not receiving either the first or second instruction are concurrent scenarios, and the UE will choose one to execute. Alternatively, the UE may not receive either the first or second instruction, or it may only execute the corresponding handover scheme based on the instruction received earlier.
  • the UE if it receives a MAC CE indicating to perform LTM within the TTT (Time To Time) that satisfies the relevant entry conditions of CHO (Confirmation of Hazardous Notice), it will first start a third timer to wait for further instructions from the network device.
  • the network device may issue a first instruction for the next step, and the UE will perform CHO based on the first instruction.
  • the network device may issue a second instruction, and the UE will perform LTM based on the second instruction.
  • the UE may start performing LTM after the third timer expires, so as to achieve the effect of prioritizing CHO by delaying the triggering of LTM.
  • the UE prioritizes LTM execution.
  • the UE when the UE receives a MAC CE, if the relevant entry conditions or execution conditions of LTM are met, it reports second information.
  • the second information is used to indicate or include that the terminal meets the relevant entry conditions or execution conditions of LTM.
  • the UE When the UE receives a MAC CE instruction from the network device to execute a CHO, if the UE has already met the relevant entry conditions or execution conditions for LTM, the UE can first report the second information to the network device to wait for further instructions from the network device before choosing to execute a CHO or LTM, instead of directly starting to execute a CHO based on the MAC CE.
  • the UE When the UE receives a MAC CE, if the relevant entry conditions or execution conditions of LTM are not met, it executes a CHO.
  • the UE enables LTM TTT (Time To-Time) when the relevant entry conditions for LTM are met.
  • LTM TTT Time To-Time
  • the UE if the UE receives a MAC CE (Continuous Action Message) instruction from the network device to perform a CHO (Confirmation of Hazard) operation, the UE can report the second information to the network device.
  • MAC CE Continuous Action Message
  • the network device can report to a second device to directly execute the CHO.
  • the UE Upon receiving a MAC CE from the network device instructing the UE to execute a CHO, and determining that the relevant entry conditions or execution conditions for LTM are met, the UE reports a second device to the network device. Afterward, the UE can execute either a CHO or LTM according to the relevant provisions of the communication protocol.
  • the UE can start a third timer when reporting the second information, and execute a CHO after the third timer expires.
  • the UE Upon receiving a MAC CE instructing the UE to execute the Choo (Continuous HCO), the UE starts a third timer.
  • the duration and timeout of the third timer can be earlier than the end of the Time To Time (TTT) of the LTM (Local Time Management).
  • TTT Time To Time
  • LTM Longer Time Management
  • the UE measures whether the Choo execution conditions are continuously met. If the Choo execution conditions are continuously met, the UE can start executing the Choo when the second timer expires. In this case, the actual waiting time of the UE is equal to the duration of the third timer.
  • the UE waits before starting to execute the Choo, thus achieving the effect of prioritizing the triggering of the HCO (Hardware Control Organization).
  • the UE when the UE receives a MAC CE instructing it to execute a CHO, it starts a third timer. If the UE currently meets the relevant entry conditions for LTM, the UE will wait for a third time period after receiving the MAC CE instructing it to execute a CHO before starting to execute the CHO.
  • the UE after reporting the second information, can also receive an instruction from the network device to perform a MAC CE of CHO or LTM.
  • the first indication is used to instruct the execution of LTM.
  • the UE can begin to assess whether the execution conditions of LTM are met. If the relevant execution conditions of LTM are met, the UE can begin to execute LTM.
  • the second instruction is used to instruct the execution of the CHO.
  • the UE can begin to assess whether the execution conditions of the CHO are met. If the relevant execution conditions of the CHO are met, the UE can begin to execute the CHO.
  • the UE can also limit itself to receiving the first or second indication only within the LTM's TTT or during the operation of the third timer before executing the corresponding handover scheme.
  • the UE starts a third timer. During the third timer's operation, if the UE receives the first indication, it immediately begins LTM execution. If the UE receives the second indication, it immediately begins Choreo (CHO) execution. If the UE does not receive either the first or second indication during the third timer's operation, it begins Choreo. It should be noted that receiving the first indication, receiving the second indication, or not receiving either the first or second indication are concurrent scenarios, and the UE will choose one to execute. If the UE does not receive either the first or second indication, or the UE will only execute the corresponding handover scheme based on the previously received indication.
  • the UE if it receives a MAC CE indicating the execution of a CHO within the TTT (Time To Watch) that satisfies the relevant entry conditions for LTM (Lower Time Management), it will first start a third timer to wait for further instructions from the network device.
  • the network device may issue a first instruction for the next step, and the UE executes LTM based on the first instruction.
  • the network device may issue a second instruction, and the UE executes the CHO based on the second instruction.
  • the UE may start executing the CHO after the third timer expires, thus achieving the effect of prioritizing LTM through delayed CHO triggering.
  • Example 3 after the UE measures that the L3 measurement result meets the relevant entry conditions of CHO, it stops measuring the L1 measurement result or the triggering event related to the L3 measurement result.
  • the UE can, based on the provisions of the first information or communication protocol, stop measuring the L1 measurement result or the triggering event related to the L3 measurement result after measuring that the L3 measurement result meets the relevant entry conditions of the CHO. Furthermore, the UE can also, when measuring that the L3 measurement result meets the relevant entry conditions of the CHO, measure whether the execution conditions of the CHO are met, and execute the CHO if the execution conditions of the CHO are met.
  • network devices can also provide a corresponding scheme to prioritize the execution of LTM.
  • the UE After the UE measures that the L1 measurement result meets the relevant entry conditions of LTM, it stops measuring the L3 measurement result or the triggering event related to the L1 measurement result.
  • the UE can, based on the provisions of the first information or communication protocol, stop measuring the L3 measurement result or the triggering event related to the L1 measurement result after measuring that the L1 measurement result meets the relevant entry conditions of LTM. Furthermore, the UE can also, when measuring that the L1 measurement result meets the relevant entry conditions of LTM, measure whether the execution conditions of LTM are met, and execute LTM if the execution conditions of LTM are met.
  • the communication method provided in this embodiment allows the UE to stop measuring the L1 measurement results after the L3 measurement result meets the relevant entry conditions for a Call for Handover (CHO), thus achieving the technical effect of not executing a Handover Decision Mechanism (LTM).
  • the UE can stop measuring the L3 measurement results after the L1 measurement result meets the relevant entry conditions for an LTM, achieving the technical effect of not executing a Call for Handover (CHO).
  • CHO Call for Handover
  • the first information includes or is used to indicate the priority of LTM and/or the priority of CHO.
  • the first information can be understood as indicating or including a priority that can be used to configure the bias values of LTM and/or CHO.
  • the first information may directly include the priority field corresponding to the LTM, or the first information may indicate the priority of the LTM through other referential methods.
  • the first information may directly include the priority field corresponding to the CHO, or the first information may indicate the priority of the CHO through other referential methods.
  • the first information may also include or be used to indicate that the priorities of LTM and CHO are different, in order to avoid handover conflicts caused by the UE performing LTM and CHO simultaneously. It should be noted that the first information may directly specify that the priorities of CHO and LTM are different, or the first information may not directly specify that the priorities of CHO and LTM are different, but rather indicate different priorities for CHO and LTM respectively.
  • the UE executes either LTM or CHO based on the priority of LTM and CHO. Specifically, the UE executes the handover scheme corresponding to the higher priority.
  • the first information can indicate the priority of LTM and CHO, and can also instruct the UE to execute the handover scheme corresponding to the higher priority.
  • the first information can indicate the priority of LTM and CHO, and the UE can execute the handover scheme corresponding to the higher priority based on the communication protocol or pre-configured rules.
  • the first information includes or is used to indicate the priority.
  • Different priority configuration schemes can also be provided according to the network device, protocol or user expectation of the UE to perform the handover scheme first. The following will introduce the two cases of UE prioritizing CHO and UE prioritizing LTM respectively.
  • UE prioritizes executing CHO.
  • the UE prioritizes the execution of CHO.
  • the first information can be to configure priorities for both CHO and LTM, with the priority configured for CHO being higher than that for LTM.
  • the first message indicates that a high priority is configured for a CHO and a low priority is configured for an LTM.
  • the first message instructs the UE to execute a high-priority handover scheme or instructs the UE to execute a CHO.
  • the first message indicates that a first priority is configured for a CHO and a second priority is configured for an LTM, with the first priority being higher than the second priority.
  • the first message instructs the UE to execute the handover scheme with the first priority, or instructs the UE to execute a CHO.
  • the UE prioritizes the CHO (Call for Handover) scheme.
  • the first message can also only configure priority for the CHO, without configuring priority for the LTM (Low Term Handover).
  • the CHO has priority, while the LTM does not.
  • the first message can also instruct the UE to execute a handover scheme with priority, or instruct the UE to execute the CHO.
  • the UE can also be instructed to prioritize the execution of the conditions that CHO needs to meet through the first indication information or communication protocol.
  • CHO execution conditions refer to the specific conditions that actually trigger the handover action after the UE has entered the CHO process. These conditions are usually handover conditions based on UE measurement results and network configuration. When the UE's measurement results meet these triggering conditions, the UE will decide to execute the handover itself without waiting for a handover command from the network device.
  • entry conditions typically refer to the initial conditions for initiating the CHO process, including whether the UE has received CHO configuration information, whether it is in an RRC connection state, and whether it has received measurement and control information from the network device. Only when these entry conditions are met can the UE begin executing the CHO.
  • the UE Before the UE starts executing the CHO, it may also need to measure whether the execution conditions of LTM or the relevant entry conditions of LTM are met.
  • the UE executes the CHO if both the execution conditions for CHO and the execution conditions for LTM are met.
  • the UE assesses whether the execution conditions for a Call for Handover (CHO) are met, and also meets the execution conditions for LTM (Local Time Management). In this case, the UE prioritizes executing the CHO to reduce network waiting latency and improve handover efficiency.
  • CHO Call for Handover
  • LTM Local Time Management
  • the UE assesses whether the execution conditions for LTM are met, it then assesses whether the execution conditions for CHO are met. If the UE meets the execution conditions for CHO, it executes CHO and stops assessing the execution conditions for LTM.
  • the UE measures whether the execution conditions of LTM are met, but does not execute LTM directly. Instead, the UE continues to measure whether the execution conditions of CHO are met. If the UE measures that the execution conditions of CHO are met, it executes CHO. After the UE starts executing CHO, it no longer needs to measure whether the execution conditions of LTM are met, and the UE stops measuring the execution conditions of LTM.
  • the UE executes the CHO and stops measuring the execution conditions of LTM.
  • the UE When the UE determines that the execution conditions for a CHO are met, it can directly begin executing the CHO. Once the UE begins executing the CHO, it no longer needs to measure whether the execution conditions for an LTM are met; the UE stops measuring the LTM execution conditions. Before executing a CHO, the UE can measure both the CHO's execution conditions and the LTM's execution conditions; once the CHO's execution conditions are met, it can begin executing the CHO.
  • the UE executes the communication method with priority if the execution conditions of CHO are met, or if the execution conditions of LTM and CHO are met.
  • the UE prioritizes LTM execution.
  • the UE prioritizes LTM.
  • the first information can be that both CHO and LTM are configured with priority, and the priority configured for CHO is lower than the priority of LTM, or the priority configured for LTM is higher than the priority of CHO.
  • the first message indicates that LTM is configured with high priority and CHO is configured with low priority.
  • the first message instructs the UE to execute a high-priority handover scheme or instructs the UE to execute LTM.
  • the first information indicates that LTM is configured with the first priority and CHO with the second priority, where the first priority is higher than the second priority.
  • the first information instructs the UE to execute the handover scheme with the first priority, or instructs the UE to execute LTM.
  • the UE prioritizes LTM.
  • the first message can also only configure priority for LTM and not for CHO. LTM has priority, while CHO does not.
  • the first message can also instruct the UE to execute a handover scheme with priority, or instruct the UE to execute LTM.
  • the UE can also be instructed to prioritize the execution of LTM based on the conditions that need to be met through the first indication information or communication protocol.
  • a UE typically execute LTM, it must at least meet the LTM execution conditions.
  • the UE executes LTM if both the execution conditions for LTM and the execution conditions for CHO are met.
  • the UE assesses whether the execution conditions for LTM and CHO are met. In this case, the UE prioritizes LTM to reduce network waiting latency and improve handover efficiency.
  • the UE determines that the execution conditions for the CHO are met, it then determines whether the execution conditions for the LTM are met. If the UE meets the execution conditions for the LTM, it executes the LTM and stops determining the execution conditions for the CHO.
  • the UE assesses whether the execution conditions of the CHO are met, but does not execute the CHO directly. Instead, the UE continues to assess whether the execution conditions of the LTM are met. If the UE determines that the execution conditions of the LTM are met, it executes the LTM. Once the UE starts executing the LTM, it no longer needs to assess whether the execution conditions of the CHO are met, and the UE stops assessing the execution conditions of the CHO.
  • the UE executes LTM and stops measuring the execution conditions of CHO.
  • the UE When the UE determines that the execution conditions for LTM are met, it can directly begin executing LTM. Once the UE starts executing LTM, it no longer needs to determine whether the execution conditions for CHO are met; the UE stops determining the execution conditions for CHO. Before executing LTM, the UE can determine the execution conditions for both LTM and CHO; once the execution conditions for LTM are met, LTM can begin execution.
  • the UE executes the communication method with priority if the UE meets the execution conditions of LTM, or if the UE meets both the execution conditions of CHO and LTM.
  • the UE determines whether to execute LTM or CHO based on the priority indicated or included in the first information.
  • the rules for the UE to determine the handover scheme are relatively simple, the UE requires less computation, and the handover efficiency is high.
  • the first information includes or is used to indicate the bias value associated with LTM and/or the bias value associated with CHO.
  • the first information can be understood as indicating or including bias values that can be configured as bias values associated with LTM and/or bias values associated with CHO.
  • the bias value associated with LTM is used by the terminal to determine whether the execution conditions of LTM are met.
  • the bias value associated with CHO is used by the terminal to determine whether the execution conditions of CHO are met. After determining whether the corresponding execution conditions are met based on the bias value, the UE can select the preferred handover scheme according to the satisfaction of the execution conditions of these two handover schemes. Alternatively, the UE can combine the satisfaction of the execution conditions of the two handover schemes with the schemes provided in the aforementioned embodiments 1-4 to comprehensively decide whether the UE should execute LTM or CHO.
  • the UE measures whether the candidate cell meets the execution conditions of the CHO based on the CHO bias value, and the UE measures whether the candidate cell meets the execution conditions of the LTM based on the LTM bias value. This applies to situations where the candidate cell is associated with the execution conditions of the LTM and the execution conditions of the CHO.
  • the first information can directly include the offset value field corresponding to the LTM, or the first information can also indicate the offset value of the LTM through other referential methods.
  • the first information can directly include the offset value field corresponding to the CHO, or the first information can also indicate the offset value of the CHO through other referential methods.
  • the first information includes or is used to indicate an offset value for LTM, which can be the offset value of an LTM trigger event.
  • the UE reuses the offset value of the LTM trigger event to measure whether the LTM candidate cell meets the LTM execution conditions.
  • the first information includes or is used to indicate an offset value for CHO, which can be the offset value of a CHO trigger event. The UE directly reuses the offset value of the CHO trigger event to measure whether the CHO candidate cell meets the CHO execution conditions.
  • the first information includes or is used to indicate the bias value for LTM, which can be a bias value configured separately by the network device; that is, the first information configures bias values for LTM and CHO respectively.
  • the UE can, based on the relevant provisions of the communication protocol, measure whether the execution conditions for LTM and CHO are met based on the configured bias values.
  • the measurement result corresponding to LTM is 15, the bias value is 1, and the pre-configuration condition is 20.
  • the measurement result corresponding to CHO is 8, the bias value is 2, and the pre-configuration condition is 15.
  • the UE can use the bias value 1 corresponding to LTM to measure whether the execution condition of LTM is met, and use the bias value 2 corresponding to CHO to measure whether the execution condition of CHO is met.
  • the first information can be configured with bias values for LTM and CHO, respectively.
  • the UE can, based on the relevant provisions of the communication protocol, measure whether the execution conditions for LTM and CHO are met based on the bias value of the triggering event and the configured bias value. For example, the UE uses the sum or product of the LTM configuration bias value and the LTM triggering event bias value as the LTM-associated bias value to measure whether the LTM candidate cell meets the LTM execution conditions. Similarly, the UE uses the sum or product of the CHO configuration bias value and the CHO triggering event bias value as the CHO-associated bias value to measure whether the CHO candidate cell meets the CHO execution conditions. The UE can execute LTM or CHO based on the comprehensively determined LTM-associated bias value and CHO-associated bias value.
  • the first information may also include or be used to indicate that the offset value of LTM and the offset value of CHO are different, in order to avoid handover conflicts caused by the UE notifying the execution of LTM and CHO. It should be noted that the first information may directly specify that the offset value of CHO and the offset value of LTM are different, or the first information may not directly specify that the offset value of CHO and the offset value of LTM are different, but instead configure different offset values for CHO and LTM respectively.
  • the UE measures the satisfaction of the execution conditions of the corresponding handover scheme based on the bias value indicated or included in the first information, so that the UE can choose to execute LTM or CHO according to the satisfaction of the execution conditions.
  • the rules for the UE to determine the handover scheme are relatively simple, the UE has less computational load, and the handover efficiency is high.
  • the methods and/or steps implemented by the UE in the above embodiments can also be implemented by components (e.g., processors, chips, chip systems, circuits, logic modules, or software) that can be used by the UE.
  • the chip system may consist of chips, or it may include chips and other discrete devices.
  • the UE includes corresponding hardware structures and/or software modules for executing each function.
  • this application can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can 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.
  • FIG 12 shows a schematic diagram of a communication device 1200.
  • the communication device 1200 includes a processing module 1201 and a transceiver module 1202. This communication device 1200 can be used to implement the functions of the aforementioned UE or network device gNB.
  • the communication device 1200 may further include a storage module (not shown in FIG12) for storing program instructions and data.
  • the transceiver module 1202 also referred to as a transceiver unit, is used to implement sending and/or receiving functions.
  • the transceiver module 1202 may consist of a transceiver circuit, a transceiver, a transceiver unit, or a communication interface.
  • the transceiver module 1202 may include a receiving module and a sending module, respectively configured to perform the receiving and sending steps performed by the UE or gNB in the above method embodiments, and/or other processes to support the technology described herein; the processing module 1201 may be configured to perform the processing steps (e.g., determination) performed by the UE or gNB in the above method embodiments, and/or other processes to support the technology described herein.
  • the transceiver module 1202 is used to acquire first information; the first information is used to instruct the UE to perform Mobility Management (LTM) or Conditional Handover (CHO) triggered by Layer 1 or Layer 2.
  • LTM Mobility Management
  • CHO Conditional Handover
  • Processing module 1201 is used to execute LTM or CHO based on the first information.
  • the communication device 1200 When the communication device 1200 is used to implement the functions of the network device gNB:
  • the transceiver module 1202 is used to send first information; the first information is used to instruct the terminal to perform mobility management (LTM) or conditional switching (CHO) triggered by layer 1 or layer 2.
  • LTM mobility management
  • CHO conditional switching
  • module can refer to an application-specific integrated circuit (ASIC), a circuit, a processor and memory that executes one or more software or firmware programs, integrated logic circuits, and/or other devices that can provide the above functions.
  • ASIC application-specific integrated circuit
  • the function/implementation process of the transceiver module 1202 can be implemented through the input/output interface (or communication interface) of the chip or chip system, and the function/implementation process of the processing module 1201 can be implemented through the processor (or processing circuit) of the chip or chip system.
  • the communication device 1200 provided in this embodiment can execute the above method, the technical effects it can achieve can be referred to the above method embodiment, and will not be repeated here.
  • the UE or gNB of the embodiments of this application can also be implemented using one or more Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (PLDs), controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.
  • FPGAs Field Programmable Gate Arrays
  • PLDs Programmable Logic Devices
  • controllers state machines
  • gate logic discrete hardware components
  • discrete hardware components any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.
  • the UE or gNB of this application embodiment can be implemented using a general bus architecture.
  • FIG13 is a schematic diagram of the structure of a communication device 1300 provided in an embodiment of this application.
  • the communication device 1300 includes a processor 1301 and a transceiver 1302.
  • the communication device 1300 can be a gNB, or a chip or chip system therein; or, the communication device 1300 can be a UE, or a chip or module therein.
  • FIG13 only shows the main components of the communication device 1300.
  • the communication device may further include a memory 1303 and input/output devices (not shown in the figure).
  • the processor 1301 is mainly used to process communication protocols and communication data, control the entire communication device, execute software programs, and process the data of the software programs.
  • the memory 1303 is mainly used to store software programs and data.
  • the transceiver 1302 may include radio frequency (RF) circuitry and an antenna.
  • the RF circuitry is mainly used for converting baseband signals to RF signals and processing RF signals.
  • the antenna is mainly used for transmitting and receiving RF signals in the form of electromagnetic waves.
  • Input/output devices such as touchscreens, displays, and keyboards, are mainly used to receive user input data and output data to the user.
  • the processor 1301, transceiver 1302, and memory 1303 can be connected via a communication bus.
  • the processor 1301 can read the software program in the memory 1303, interpret and execute the instructions of the software program, and process the data of the software program.
  • the processor 1301 performs baseband processing on the data to be transmitted and outputs the baseband signal to the radio frequency (RF) circuit.
  • the RF circuit then performs RF processing on the baseband signal and transmits the RF signal outward in the form of electromagnetic waves through the antenna.
  • the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 1301.
  • the processor 1301 converts the baseband signal into data and processes the data.
  • the radio frequency circuitry and antenna can be set up independently of the processor that performs baseband processing.
  • the radio frequency circuitry and antenna can be arranged remotely, independent of the communication device.
  • the function/implementation of the processing module 1201 in Figure 12 can be achieved by the processor 1301 in the communication device 1300 shown in Figure 13 calling computer execution instructions stored in the memory 1303.
  • the function/implementation of the transceiver module 1202 in Figure 12 can be achieved by the transceiver 1302 in the communication device 1300 shown in Figure 13.
  • the UE or gNB in this application can adopt the composition structure shown in FIG14, or include the components shown in FIG14.
  • FIG14 is a schematic diagram of the composition of a communication device 1400 provided in this application.
  • the communication device 1400 can be a terminal device or a chip or system-on-a-chip in a terminal device; or, it can be a module or chip or system-on-a-chip in a UE or gNB.
  • the communication device 1400 includes at least one processor 1401 and at least one communication interface ( Figure 14 is merely an example illustrating the inclusion of a communication interface 1404 and a processor 1401).
  • the communication device 1400 may also include a communication bus 1402 and a memory 1403.
  • Processor 1401 may be a general-purpose central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof.
  • processor 1401 may also be other devices with processing capabilities, such as circuits, devices, or software modules, without limitation.
  • Communication bus 1402 is used to connect different components in communication device 1400, enabling communication between them.
  • Communication bus 1402 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc.
  • PCI Peripheral Component Interconnect
  • EISA Extended Industry Standard Architecture
  • This bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 14, but this does not indicate that there is only one bus or one type of bus.
  • Communication interface 1404 is used for communicating with other devices or communication networks.
  • communication interface 1404 can be a module, circuit, transceiver, or any device capable of communication.
  • communication interface 1404 can also be an input/output interface located within processor 1401, used to implement signal input and signal output for the processor.
  • the memory 1403 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and/or instructions; it may also be a random access memory (RAM) or other type of dynamic storage device capable of storing information and/or instructions; it may also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.
  • ROM read-only memory
  • RAM random access memory
  • EEPROM electrically erasable programmable read-only memory
  • CD-ROM compact disc read-only memory
  • optical disc storage including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.
  • magnetic disk storage media or other magnetic storage devices etc., without limitation.
  • the memory 1403 may exist independently of the processor 1401 or may be integrated with the processor 1401.
  • the memory 1403 may be located within or outside the communication device 1400, without limitation.
  • the processor 1401 may be used to execute the instructions stored in the memory 1403 to implement the methods provided in the following embodiments of this application.
  • the communication device 1400 may also include an output device 1405 and an input device 1406.
  • the output device 1405 communicates with the processor 1401 and can display information in various ways.
  • the output device 1405 may be a liquid crystal display (LCD), a light-emitting diode (LED) display device, a cathode ray tube (CRT) display device, or a projector, etc.
  • the input device 1406 communicates with the processor 1401 and can receive user input in various ways.
  • the input device 1406 may be a mouse, keyboard, touchscreen device, or sensing device, etc.
  • the function/implementation process of the processing module 1201 in Figure 12 can be implemented by the processor 1401 in the communication device 1400 shown in Figure 14 calling computer execution instructions stored in the memory 1403.
  • the function/implementation process of the transceiver module 1202 in Figure 12 can be implemented by the communication interface 1404 in the communication device 1400 shown in Figure 14.
  • the structure shown in Figure 14 does not constitute a specific limitation on the UE or gNB.
  • the UE or gNB may include more or fewer components than shown in the figure, or combine some components, or split some components, or have different component arrangements.
  • the components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.
  • this application also provides a communication device, which includes a processor for implementing the methods in any of the above method embodiments.
  • the communication device also includes a communication interface for communicating with modules outside the communication device.
  • each functional unit can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.
  • the integrated unit can be implemented in hardware or as a software functional unit.

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Abstract

本申请提供一种通信方法、终端、网络设备、计算机程序产品及存储介质，涉及无线通信技术领域。终端获取第一信息；第一信息用于指示终端执行层1/层2触发的移动性管理LTM或条件切换CHO。终端根据第一信息，执行LTM或CHO。LTM可以是基于网络指示触发的LTM，也可以是基于事件触发的条件LTM。本实施例提供的通信方法，针对终端同时配置了CHO和LTM的情况下，终端接收第一信息，根据第一信息执行CHO或LTM，以有效解决CHO和LTM两种切换方式共存时存在切换冲突的技术问题。

Description

通信方法、终端、网络设备、计算机程序产品及存储介质
本申请要求于2024年06月12日提交国家知识产权局、申请号为202410756608.0、发明名称为“通信方法、终端、网络设备、计算机程序产品及存储介质”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请实施例涉及无线通信技术领域，尤其涉及一种通信方法、终端、网络设备、计算机程序产品及存储介质。
背景技术
无线通信中，终端在连接到源小区时，可以从其他候选小区中选择一个目标小区，从源小区切换到目标小区，该切换过程可以称为小区切换或切换小区。
目前，终端切换小区的方案可以包括涉及层1/层2触发的移动性管理(Layer 1/2 Triggered Mobility management，LTM)和条件切换(Conditional HandOver，CHO)。其中，LTM是基于无线接口的协议层1和协议层2的测量结果进行切换，CHO是基于协议层3测量结果进行切换。切换(例如CHO和LTM)过程包括准备、执行、完成三个阶段，在不同阶段中包括响应的子步骤。其中，事件用于触发测量上报或切换执行。在为终端同时配置CHO切换和LTM切换的情况下，如何协调两种切换方式成为亟待解决的问题。
发明内容
本申请实施例提供一种通信方法、终端、网络设备、计算机程序产品及存储介质，用于解决终端配置有LTM和CHO两种小区切换方案的情况下，可能存在两种切换方案冲突导致终端切换小区的效率较差的技术问题。
为达到上述目的，本申请的实施例采用如下技术方案：
第一方面，提供了一种通信方法，应用于终端(User Equipment，UE)或UE中的功能模块或芯片等。本申请以该通信方法应用于UE为例进行说明，所述方法包括：UE获取第一信息，第一信息用于指示终端执行层1/层2触发的移动性管理LTM或条件切换CHO。UE根据第一信息执行LTM，切换的目标小区为LTM候选小区中的某一个小区；或，UE根据第一信息执行CHO，切换的目标小区为CHO候选小区中的某一个小区。
本实施例提供的通信方法，UE在配置了CHO和LTM的情况下，UE可以根据第一信息选择执行CHO或LTM，以实现在不同的切换场景或业务需求下选择不同的切换方案，有效避免两种切换方案共存导致的切换冲突，提高小区切换效率。
一种可能的设计中，UE获取的第一信息可以是网络设备发送给UE，也可以是预配置在UE的通信模块内或通信协议内，或是协议规定的，不予限制。基于该可能的设计，设计了第一信息的多种实现形式，灵活多样且扩大应用场景。
一种可能的设计中，第一信息可以直接指示UE执行LTM或直接指示UE执行CHO。或，第一信息也可以指示切换选择相关的信息，例如指示优先级、偏置值、等待时长、切换选择规则、依据参数等切换选择相关的信息，以通过切换选择相关的参数间接指示UE执行LTM或CHO。基于该可能的设计，设计了第一信息具备直接指示或间接指示切换方式的功能，灵活多样且扩大应用场景。
在第一方面的一种可能实施方式中，UE所执行的LTM，可以包括基于网络设备指示的LTM，也可以包括基于事件触发的LTM或条件LTM(Condition Layer 1/2 Triggered Mobility management，CLTM)。UE基于网络设备指示的LTM，优化延迟性能，提高服务连续性。基于事件触发的CLTM，减少切换延迟，提高切换效率。
在第一方面的一种可能实施方式中，UE还可以接收网络设备发送的配置信息，配置信息用于为UE同时配置CHO和LTM。比如，配置信息为一个，该配置信息包括CHO的配置参数和LTM的配置参数，如此可以节省信令开销。或，配置信息为多个，该配置信息包括CHO的配置信息和LTM的配置信息，以区分不同的切换方式对应的配置信息，其中CHO的配置信息和LTM的配置信息可以同时发送，也可以不同时发送，不予限制。进一步的，UE基于CHO的配置参数配置CHO。UE基于LTM的配置参数配置LTM。
一种可能的设计，用于为UE同时配置CHO和LTM的配置信息和第一信息可以携带在同一消息中发送给UE，该消息可以称为重配置信息，该重配置信息包括了第一信息、CHO的配置参数和LTM的配置参数。UE可以基于该重配置信息中的CHO的配置参数，配置CHO。基于LTM的配置参数配置LTM。并在配置LTM和CHO后，基于第一信息选择执行LTM或CHO，从源小区切换至目标小区。如此可以节省信令开销。
一种可能的设计中，UE在基于第一信息，执行LTM或CHO之后，所述方法还可以包括：UE上报指示信息，该指示信息可以包括或用于指示UE执行LTM或CHO的事件上报和/或配置索引。事件上报可以指示UE执行的小区切换是LTM或CHO，配置索引可以指示UE切换的是LTM配置包括的LTM候选小区或CHO配置包括的CHO候选小区。
例如，UE根据第一信息执行CHO，UE上报的指示信息可以包括UE执行CHO的事件上报和/或配置索引。再例如，UE根据第一信息执行LTM，UE上报的指示信息可以包括UE执行LTM的事件上报和/或配置索引。
可选的，UE可以在开始执行切换时，且与源小区连接未断开的情况下，向源小区对应的源接入网设备上报该指示信息，或，UE也可以在执行切换成功后，向目标小区对应的目标接入网设备上报该指示信息。
基于该可能的设计，UE可以将执行的小区切换上报给网络侧设备，以便与网络测设备同步小区切换方式，保证小区切换的准确性。
在第一方面的一种可能实施方式中，第一信息包括第一时长，第一时长为第一定时器的时长。在为UE配置了LTM和CHO的情况下，UE在得到L1测量结果后不会立即触发衡量是否满足LTM的相关进入条件，而是在得到L1的测量结果时启动第一定时器，在第一定时器运行一段时间后，即等待一段时间后再选择触发衡量是否满足LTM的相关进入条件。
或，UE在衡量满足LTM的执行条件时不会立即触发执行LTM，而是在满足LTM的执行条件时先启动第一定时器，在第一定时器运行一段时间后，即在等待一段时间或等待第一定时器超时后再选择执行LTM或CHO。
或，UE在衡量满足LTM的执行条件时不会立即触发执行LTM，如果衡量的满足LTM的执行条件的LTM候选小区为CHO候选小区，UE会在衡量满足LTM的执行条件先启动第一定时器，在第一定时器运行一段时间后，即在等待一段时间或等待第一定时器超时后再选择还行LTM或CHO。
如在等待一段时间后，根据CHO的执行条件的满足情况，执行LTM或CHO：如果在第一定时器运行期间，满足CHO的执行条件，则执行CHO；或，如果第一定时器运行期间不满足CHO的执行条件，则执行LTM。
其中，该段时间可以小于或等于第一时长。第一时长可以为LTM的触发事件的触发时长(Time To Trigger，TTT)。
基于该可能的设计，UE在得到L1测量结果时，开启第一定时器或运行LTM的TTT。在第一定时器运行期间或在LTM的TTT期间，UE不满足CHO的执行条件，UE会在TTT超时后执行LTM。或，在LTM的TTT内如果UE满足CHO的执行条件，UE则开始执行CHO，不需要再等待第一定时器超时，也不需要执行LTM。
如此，UE可以通过延迟衡量LTM的相关进入条件或延迟执行LTM，实现LTM的延迟或推后LTM的执行，达到优先执行CHO的目的。
在第一方面的一种可能实施方式中，第一信息包括第二时长，第二时长为第二定时器的时长。在为UE配置了LTM和CHO的情况下，UE在满足LTM的执行条件和CHO的相关进入条件，不立即开始执行LTM，而是在满足LTM的执行条件时先启动第二定时器，在第二定时器运行一段时间后，即等待一段时间后再选择执行LTM或CHO。
如在等待一段时间后，根据CHO的相关离开条件的满足情况，执行LTM或CHO。如果在第二定时器运行期间，满足CHO的相关离开条件，且持续满足LTM的执行条件，在满足CHO的相关离开条件时执行LTM。或，如第二定时器运行期间不满足CHO的相关离开条件，在第二定时器超时后执行LTM。
其中，该第二时长可以小于CHO的触发事件的触发时长TTT。
基于该可能的设计，UE在满足CHO的相关进入条件时启动CHO的TTT，在满足LTM的执行条件时启动第二定时器。在第二定时器运行期间，UE满足CHO的相关离开条件时执行LTM。或，UE在第二定时器运行期间不满足CHO的相关离开条件，在第二定时器超时后执行LTM。
如此，UE可以通过延迟执行LTM，实现LTM的延迟或推后LTM的执行，达到优先执行CHO的目的。
在第一方面的一种可能实施方式中，第一信息用于指示或包括小区变更命令，小区变更命令用于指示终端执行LTM。小区变更命令可以包括介质访问控制元素(Media Access Control Control Element，MAC CE)，为网络设备发送给UE的命令。
UE可以基于自身的测量结果，衡量是否满足CHO的执行条件，自行决定执行CHO。如果UE在衡量满足CHO的相关进入条件时接收到网络设备发送的小区变更命令，小区变更命令指示UE执行LTM，UE不会基于小区变更指令立即执行LTM，也不会立即衡量是否满足CHO的相关执行条件，而是先上报第二信息给网络设备，向网络设备同步该UE当前满足CHO的相关进入条件的状态。UE向网络设备上报第二信息后，等待网络设备的进一步指示，再选择执行LTM或CHO。
可选的，UE在满足CHO的相关进入条件的TTT内，如果接收到指示执行LTM的小区切换命令，会向网络设备发送第二信息，等待网络设备的进一步指示。
一种可能的设计，UE可以在上报第二信息时启动第三定时器。UE在接收到指示执行LTM的小区切换命令，若UE当前已满足CHO的相关进入条件，向网络设备上报第二信息，并启动第三定时器。UE可以在第三定时器超时后开始执行LTM。
另一种可能的设计中，UE可以在上报第二信息后，接收网络设备发送的小区切换命令或小区切换指示，基于网络设备发送的小区切换命令或小区切换指示执行LTM或CHO。
例如，UE若接收到第一指示，第一指示用于指示执行CHO。UE在接收到第一指示时，可以开始衡量是否满足CHO的执行条件，在满足CHO的相关执行条件，开始执行CHO。
再例如，UE若接收到第二指示，第二指示用于指示执行LTM。UE在接收到第二指示时，可以开始衡量是否满足LTM的执行条件，在满足LTM的相关执行条件，开始执行LTM。
再例如，UE在向网络设备上报第二信息后，也可以再启动一个定时器。UE在定时器运行期间，如果接收到第一指示，UE基于第一指示执行CHO。或，UE在定时器运行期间，如果接收到第二指示，UE基于第二指示执行LTM。或，如果UE在定时器运行期间未接收到第一指示和第二指示，UE可以在定时器超时后执行LTM。
基于此，UE在接收到网络设备下发的小区切换指令指示UE执行LTM，UE先上报第二信息向网络设备同步UE满足CHO的相关进入条件的状态，以等待网络设备的进一步指示。通过延迟执行小区切换命令指示的LTM，达到优先触发CHO的效果。
在第一方面的一种可能实施方式中，第一信息用于指示或包括小区变更命令，小区变更命令用于指示终端执行CHO。小区变更命令可以包括介质访问控制元素MAC CE，为网络设备发送给UE的命令。
UE可以基于自身的测量结果，衡量是否满足LTM的执行条件，自行决定执行LTM。如果UE在衡量满足LTM的相关进入条件时接收到网络设备发送的小区变更命令，小区变更命令指示UE执行CHO，UE不会基于小区变更指令立即执行CHO，也不会立即衡量是否满足LTM的相关执行条件，而是先上报第二信息给网络设备，向网络设备同步该UE当前满足LTM的相关进入条件的状态。UE向网络设备上报第二信息后，等待网络设备的进一步指示，再选择执行CHO或LTM。
可选的，UE在满足LTM的相关进入条件的TTT内，如果接收到指示执行CHO的小区切换命令，会向网络设备发送第二信息，等待网络设备的进一步指示。
一种可能的设计，UE可以在上报第二信息时启动第三定时器。UE在接收到指示执行CHO的小区切换命令，若UE当前已满足LTM的相关进入条件，向网络设备上报第二信息，并启动第三定时器。UE可以在第三定时器超时后开始执行CHO。
另一种可能的设计中，UE可以在上报第二信息后，接收网络设备发送的小区切换命令或小区切换指示，基于网络设备发送的小区切换命令或小区切换指示执行CHO或LTM。
例如，UE若接收到第一指示，第一指示用于指示执行LTM。UE在接收到第一指示时，可以开始衡量是否满足LTM的执行条件，在满足LTM的相关执行条件，开始执行LTM。
再例如，UE若接收到第二指示，第二指示用于指示执行CHO。UE在接收到第二指示时，可以开始衡量是否满足CHO的执行条件，在满足CHO的相关执行条件，开始执行CHO。
再例如，UE在向网络设备上报第二信息后，也可以再启动一个定时器。UE在定时器运行期间，如果接收到第一指示，UE基于第一指示执行LTM。或，UE在定时器运行期间，如果接收到第二指示，UE基于第二指示执行CHO。或，如果UE在定时器运行期间未接收到第一指示和第二指示，UE可以在定时器超时后执行CHO。
基于此，UE在接收到网络设备下发的小区切换指令指示UE执行CHO，UE先上报第二信息向网络设备同步UE满足LTM的相关进入条件的状态，以等待网络设备的进一步指示。通过延迟执行小区切换命令指示的CHO，达到优先触发LTM的效果。
在第一方面的一种可能实施方式中，第一信息包括第一时长，第一时长为第一定时器的时长。在为UE配置了CHO和LTM的情况下，UE在得到L3测量结果后不会立即触发衡量是否满足CHO的相关进入条件，而是在得到L3的测量结果时启动第一定时器，在第一定时器运行一段时间后，即等待一段时间后再选择触发衡量是否满足CHO的相关进入条件。
或，UE在衡量满足CHO的执行条件时不会立即触发执行CHO，而是在满足CHO的执行条件时先启动第一定时器，在第一定时器运行一段时间后，即在等待一段时间或等待第一定时器超时后再选择执行CHO或LTM。
或，UE在衡量L3测量结果满足CHO的执行条件时不会立即触发执行CHO，如果衡量的满足CHO的执行条件的CHO候选小区为LTM候选小区，UE会在衡量满足CHO的执行条件先启动第一定时器，在第一定时器运行一段时间后，即在等待一段时间或等待第一定时器超时后再选择还行CHO或LTM。
如在等待一段时间后，根据LTM的执行条件的满足情况，执行CHO或LTM：如果在第一定时器运行期间，满足LTM的执行条件，则执行LTM；或，如果第一定时器运行期间不满足LTM的执行条件，则执行CHO。
其中，该段时间可以小于或等于第一时长。第一时长可以为CHO的触发事件的触发时长(Time To Trigger，TTT)。
基于该可能的设计，UE在得到L3测量结果时，开启第一定时器或运行CHO的TTT。在第一定时器运行期间或在CHO的TTT期间，UE不满足LTM的执行条件，UE会在TTT超时后执行CHO。或，在CHO的TTT内如果UE满足LTM的执行条件，UE则开始执行LTM，不需要再等待第一定时器超时，也不需要执行CHO。
如此，UE可以通过延迟衡量CHO的相关进入条件或延迟执行CHO，实现CHO的延迟或推后CHO的执行，达到优先执行LTM的目的。
在第一方面的一种可能实施方式中，第一信息包括第二时长，第二时长为第二定时器的时长。在为UE配置了CHO和LTM的情况下，UE在满足CHO的执行条件和LTM的相关进入条件，不立即开始执行CHO，而是在满足CHO的执行条件时先启动第二定时器，在第二定时器运行一段时间后，即等待一段时间后再选择执行CHO或LTM。
如在等待一段时间后，根据LTM的相关离开条件的满足情况，执行CHO或LTM。如果在第二定时器运行期间，满足LTM的相关离开条件，且持续满足CHO的执行条件，在满足LTM的相关离开条件时执行CHO。或，如第二定时器运行期间不满足LTM的相关离开条件，在第二定时器超时后执行CHO。
其中，该第二时长可以小于LTM的触发事件的触发时长TTT。
基于该可能的设计，UE在满足LTM的相关进入条件时启动LTM的TTT，在满足CHO的执行条件时启动第二定时器。在第二定时器运行期间，UE满足LTM的相关离开条件时执行CHO。或，UE在第二定时器运行期间不满足LTM的相关离开条件，在第二定时器超时后执行CHO。
如此，UE可以通过延迟执行CHO，实现CHO的延迟或推后CHO的执行，达到优先执行LTM的目的。
在第一方面的一种可能实施方式中，第一信息包括或用于指示LTM的优先级和/或CHO的优先级，UE根据优先级决定执行LTM或CHO。第一信息指示的LTM的优先级和CHO的优先级可以不同，以避免UE同时执行LTM和CHO导致切换冲突的情况。
在一种可能设计中，第一信息为CHO配置的优先级高于LTM的优先级。
例如，第一信息指示为CHO配置高优先级，为LTM配置低优先级。第一信息指示UE执行高优先级的切换方案，或指示UE执行CHO。再例如，第一信息指示为CHO配置第一优先级，为LTM配置第二优先级，第一优先级高于第二优先级。第一信息指示UE执行第一优先级的切换方案，或指示UE执行CHO。在其他情况下，UE优先执行CHO，第一信息也可以仅为CHO配置优先级，不为LTM配置优先级。CHO存在优先级，LTM不存在优先级。第一信息也可以指示UE执行存在优先级的切换方案，或指示UE执行CHO。
第一信息指示UE根据优先级，优先执行CHO的方案，可以包括以下几种情况：UE在CHO的执行条件和LTM的执行条件均满足的情况下，执行CHO；UE在LTM的执行条件满足之后，继续衡量CHO的执行条件，如果CHO的执行条件满足，则执行CHO，停止衡量LTM的执行条件；UE在CHO的执行条件满足的情况下，执行CHO，停止衡量LTM的执行条件。
UE根据第一信息指示的LTM的优先级和CHO的优先级，在CHO的优先级高于LTM的优先级的情况下，衡量满足CHO的执行条件，或衡量满足CHO和LTM的执行条件的情况下，UE执行CHO，选择响应更灵活、快速的小区切换方案。
在一种可能设计中，第一信息为CHO配置的优先级低于LTM的优先级。
例如，第一信息指示为CHO配置低优先级，为LTM配置高优先级。第一信息指示UE执行高优先级的切换方案，或指示UE执行LTM。再例如，第一信息指示为LTM配置第一优先级，为CHO配置第二优先级，第一优先级高于第二优先级。第一信息指示UE执行第一优先级的切换方案，或指示UE执行LTM。在其他情况下，UE优先执行LTM，第一信息也可以仅为LTM配置优先级，不为CHO配置优先级。LTM存在优先级，CHO不存在优先级。第一信息也可以指示UE执行存在优先级的切换方案，或指示UE执行LTM。
第一信息指示UE根据优先级，优先执行LTM的方案，可以包括以下几种情况：
UE在LTM的执行条件和CHO的执行条件均满足的情况下，执行CHO；UE在LTM的执行条件满足之后，继续衡量CHO的执行条件，如果CHO的执行条件满足，则执行CHO，停止衡量LTM的执行条件；UE在CHO的执行条件满足的情况下，执行CHO，停止衡量LTM的执行条件。
UE根据第一信息指示的LTM的优先级和CHO的优先级，在LTM的优先级高于CHO的优先级的情况下，衡量满足LTM的执行条件，或衡量满足CHO和LTM的执行条件的情况下，UE执行LTM，选择低延迟高连续性的小区切换方案。
在第一方面的一种可能实施方式中，第一信息包括或用于指示LTM的偏置值和/或CHO的偏置值。LTM关联的偏置值用于终端衡量是否满足LTM的执行条件。CHO关联的偏置值用于终端衡量是否满足CHO的执行条件。UE在基于偏置值衡量是否满足对应的执行条件后，可以根据这两类切换方案的执行条件的满足情况，选择优先满足的切换方案。
在一种可能设计中，UE根据CHO的偏置值衡量候选小区是否满足CHO的执行条件，以及，UE根据LTM的偏置值衡量候选小区是否满足LTM的执行条件，适用于候选小区关联LTM的执行条件和CHO的执行条件的情况。
第一信息包括或用于指示LTM的偏置值，可以为LTM的触发事件的偏置值。UE复用LTM的触发事件的偏置值，衡量LTM候选小区是否满足LTM的执行条件。或，第一信息包括或用于指示CHO的偏置值，可以为CHO的触发事件的偏置值。UE直接复用CHO的触发事件的偏置值，衡量CHO候选小区是否满足CHO的执行条件。
第一信息包括或用于指示LTM的偏置值，可以是网络设备额外配置的偏置值，即第一信息为LTM和CHO分别配置了偏置值。UE可以基于通信协议的相关规定，基于配置的偏置值衡量是否满足LTM的执行条件和CHO的执行条件。第一信息可以分别为LTM和CHO配置偏置值。UE可以基于通信协议的相关规定，基于触发事件的偏置值和配置的偏置值衡量是否满足LTM的执行条件和CHO的执行条件。
第二方面，本申请提供一种通信方法，应用于网络设备，例如源小区对应的接入网设备(或称为源接入网设备)，UE连接源小区对应的接入网设备。网络设备向UE发送第一信息；第一信息用于指示终端执行层1层2触发的移动性管理LTM或条件切换CHO。
本实施例提供的通信方法，网络设备与UE通信连接，网络设备向UE发送第一信息，UE在配置了CHO和LTM的情况下，可以在不同的切换场景或业务需求下选择不同的切换方案。UE根据第一信息选择执行CHO或LTM，有效避免两种切换方案共存导致的切换冲突，提高小区切换效率。
在第二面的一种可能实施方式中，UE所执行的LTM，可以包括基于网络设备指示的LTM，也可以包括基于事件触发的CLTM。UE基于网络设备指示的LTM，优化延迟性能，提高服务连续性。基于事件触发的CLTM，减少切换延迟，提高切换效率。
在第二方面的一种可能实施方式中，网络设备可以向UE发送配置信息，配置信息用于为UE同时配置CHO和LTM。UE接收网络设备发送的配置信息的具体实现方案可参照第一方面，不再赘述。
在第二面的一种可能实施方式中，第一信息包括第一时长，第一时长为第一定时器的时长。UE在得到L3测量结果后不会立即触发衡量是否满足CHO的相关进入条件，或，UE在衡量满足CHO的执行条件时不会立即触发执行CHO，而是先启动第一定时器，在等待一段时间后再选择触发衡量是否满足CHO的相关进入条件，或在等待一段时间后再选择执行CHO或LTM。UE基于第一时长触发或开始执行CHO的具体实现方案可参照第一方面，不再赘述。
在第二面的一种可能实施方式中，第一信息包括第二时长，第二时长为第二定时器的时长。UE配置了CHO和LTM，UE在满足CHO的执行条件和LTM的相关进入条件，不立即开始执行CHO，而是先启动第二定时器，在等待一段时间后再选择执行CHO或LTM，通过延迟触发CHO达到优先LTM的效果。UE基于第二时长触发或开始执行CHO的具体实现方案可参照第一方面，不再赘述。
在第二面的一种可能实施方式中，第一信息用于指示或包括小区切换命令。UE在满足CHO的相关进入条件的情况接收到指示执行LTM的小区切换命令，UE向网络设备发送第二信息，等待网络设备的进一步指示，再选择执行CHO或LTM。UE通过延迟执行小区切换命令指示的LTM，达到优先触发CHO的效果。UE基于小区切换命令上报第二信息的具体实现方案可参照第一方面，不再赘述。
在第二面的一种可能实施方式中，第一信息用于指示或包括小区切换命令。UE在满足LTM的相关进入条件的情况接收到指示执行CHO的小区切换命令，UE向网络设备发送第二信息，等待网络设备的进一步指示，再选择执行CHO或LTM。UE通过延迟执行小区切换命令指示的CHO，达到优先触发LTM的效果。UE基于小区切换命令上报第二信息的具体实现方案可参照第一方面，不再赘述。
在第二面的一种可能实施方式中，第一信息包括或用于指示LTM的优先级和/或CHO的优先级，UE根据优先级决定执行LTM或CHO。第一信息可以指示的LTM的优先级和CHO的优先级不同，以避免UE同时执行LTM和CHO导致切换冲突的情况。UE根据第一信息指示的LTM和/或CHO的优先级，执行LTM或CHO的具体实现方案可参照第一方面，不再赘述。
在第二方面的一种可能实施方式中，第一信息包括或用于指示LTM的偏置值和/或CHO的偏置值。UE在基于偏置值衡量是否满足对应的执行条件后，可以根据这两类切换方案的执行条件的满足情况，选择优先满足的切换方案。UE根据第一信息包括或用于指示LTM的偏置值和/或CHO的偏置值，执行LTM或CHO的具体实现方案可参照第一方面，不再赘述。
第三方面，本申请提供一种通信方法，应用于通信系统，通信系统包括网络设备和终端。网络设备向终端发送第一信息；第一信息用于指示终端触发层1层2触发的移动性管理LTM或条件切换CHO。终端根据第一信息，执行LTM或CHO。
本实施例提供的通信方法，网络设备与UE通信连接，网络设备向UE发送第一信息，UE在配置了CHO和LTM的情况下，可以在不同的切换场景或业务需求下选择不同的切换方案。UE根据第一信息选择执行CHO或LTM，有效避免两种切换方案共存导致的切换冲突，提高小区切换效率。
第四方面，本申请提供一种终端，终端包括通信模块、存储器和处理器，通信模块和存储器均与处理器耦合。存储器存储计算机执行指令，处理器执行存储器存储的计算机执行指令，使得电子设备执行如第一方面中任一项的通信方法。
第五方面，本申请提供一种网络设备，网络设备包括通信模块、存储器和处理器，通信模块和存储器均与处理器耦合。存储器存储计算机执行指令，处理器执行存储器存储的计算机执行指令，使得电子设备执行如第二方面的通信方法。
第六方面，本申请提供一种计算机可读存储介质，计算机可读存储介质中存储有计算机程序，当其在计算机上运行时，使得计算机执行如第一方面至第三方面中任一项的通信方法。
第七方面，本申请提供一种计算机程序产品，包括计算机程序，计算机程序被处理器执行时，实现如第一方面至第三方面中任一项的通信方法
其中，第二方面至第七方面中任一种设计方式所带来的技术效果可参见第一方面中不同设计方式所带来的技术效果，此处不再赘述。
附图说明
图1为移动通信系统的一种架构示意图；
图2为无线协议栈的分层示意图；
图3为基于LTM进行小区切换的信令示意图；
图4为基于CHO进行小区切换的信令示意图；
图5为本申请实施例提供的一种通信方法的流程示意图；
图6为本申请实施例提供的通信方法的信令交互图；
图7为本申请实施例提供的通信方法所涉及的UE基于第一时长执行LTM或CHO的示意图；
图8为本申请实施例提供的通信方法所涉及的UE基于第二时长执行LTM或CHO的示意图；
图9为本申请实施例提供的通信方法所涉及的UE基于第二时长执行LTM或CHO的另一示意图；
图10为本申请实施例提供的通信方法所涉及的UE基于MAC CE执行LTM或CHO的示意图；
图11为本申请实施例提供的通信方法所涉及的UE基于MAC CE、第一指示和第二指示执行LTM或CHO的示意图；
图12为本申请实施例提供的通信方法所应用的通信装置的一种结构示意图；
图13为本申请实施例提供的通信方法所应用的通信装置的另一种结构示意图；
图14为本申请实施例提供的通信方法所应用的通信装置的另一种结构示意图。
具体实施方式
以下结合附图对本申请的示范性实施例做出说明，其中包括本申请实施例的各种细节以助于理解，应当将它们认为仅仅是示范性的。因此，本领域普通技术人员应当认识到，可以对这里描述的实施例做出各种改变和修改，而不会背离本申请的范围和精神。同样，为了清楚和简明，以下的描述中省略了对公知功能和结构的描述。
为便于理解，先介绍本申请实施例涉及的部分技术常识。
终端为用户侧的一种用于接收或发射信号的实体，用于向网络设备发送上行信号，或从网络设备接收下行信号。终端可以为用户设备(User Equipment，UE)或移动台(Mobile Station，MS)或移动终端(Mobile terminal，MT)等，包括具有无线通信功能的手持式设备、车载设备、可穿戴设备、计算设备或传感设备。具体的，终端可以是手机(Mobile Phone)、平板电脑或带无线收发功能的电脑，还可以是虚拟现实(Virtual Reality，VR)终端、增强现实(Augmented Reality，AR)终端、工业控制中的无线终端、无人驾驶中的无线终端、远程医疗中的无线终端、智能电网中的无线终端、智慧城市(Smart City)中的无线终端、智能家居(例如智能音箱)、车载终端、火车探测器等。本申请实施例中，用于实现终端的功能的装置可以是终端，也可以是能够支持终端实现该功能的装置，例如芯片系统(例如一个芯片，或多个芯片组成的处理系统)或调制解调器。下面以用于实现终端的功能的装置是终端为例，描述本申请实施例提供的方法。
网络设备(Network Device，ND)是指提供移动通信网络的网络侧设备。在网络设备提供的移动通信网络的覆盖范围内，一个或多个UE可以接入移动通信网络，实现通信。网络设备用于接收来自UE的上行信号，或向UE发送下行信号，以实现UE的资源调度、无线资源管理、无线接入控制等功能，是无线接入网(Radio Access Network，RAN)中的一种将UE接入到无线网络的设备，RAN可以与核心网相连(例如可以是LTE的核心网，也可以是5G的核心网等)。网络设备可以是LTE中的演进型基站(Evolutional Node B，eNB或eNodeB)，或5G网络或未来演进的公共陆地移动网络(Public Land Mobile Network，PLMN)中的基站，或支持单侧传输的基站(例如，支持上行传输不支持下行传输的uplink only TRP或Asymmetric TRP)，或宽带网络业务网关(Broadband Network Gateway，BNG)，或汇聚交换机或非3GPP接入设备；或本申请实施例中的网络设备还可以是云无线接入网络
(Cloud Radio Access Network，CRAN)中的无线控制器；或传输接收节点(Transmission and Reception Point，TRP)，或包括TRP的设备等，本申请实施例对此不作具体限定。可选的，本申请实施例中的网络设备可以包括各种形式的基站，例如：宏基站，微基站(也称为小站)，中继站，接入点等，本申请实施例对此不作具体限定。本申请实施例中，用于实现网络设备的功能的装置可以是网络设备，也可以是能够支持网络设备实现该功能的装置，例如芯片系统(例如一个芯片，或多个芯片组成的处理系统)或调制解调器(modem)。下面以用于实现网络设备的功能的装置是网络设备为例，描述本申请实施例提供的方法。
多个UE与网络设备组成移动通信系统。移动通信系统可以主要包括长期演进(Long Term Evolution，LTE)系统、全球移动通信系统(Global System for Mobile Communication，GSM)、第五代(5th Generation，5G)通信系统、5G之后的通信系统、新无线接入技术(New Radio Access Technology，NR)系统等。当然，移动通信系统还可以包括通用移动通信系统(Universal Mobile Telecommunications System，UMTS)、全球互联微波接入(Worldwide Interoperability for Microwave Access，WiMAX)通信系统、陆地无线接入网(UMTS Terrestrial Radio Access Network，UTRAN)系统、增强型数据速率GSM演进(Enhanced Data Rate for GSM Evolution，EDGE)系统的无线接入网(GSM EDGE Radio Access Network，GERAN)系统。此外，本实施例提供的技术方案还可以应用于涉及多端的无线通信系统中，例如公共陆地移动网络(Public Land Mobile Network，PLMN)系统、车到其它设备(Vehicle-to-X，V2X)系统等。其中，V2X系统可以包括车到互联网(Vehicle to Network，V2N)系统、车到车(Vehicleto-Vehicle，V2V)系统、车到基础设施(Vehicle to Infrastructure，V2I)系统、车到行人(Vehicle to Pedestrian，V2P)系统、车间通信长期演进技术(Long Term Evolution-Vehicle，LTE-V)系统、车联网系统、机器类通信(Machine Type Communication，MTC)系统、物联网(Internet of Things，IoT)系统、机器间通信长期演进技术(Long Term Evolution-Machine，LTE-M)系统，机器到机器(Machine to Machine，M2M)系统等，不作限定。
如图1所示，为移动通信系统的一种架构示意图。移动通信系统可以包括接入网设备和UE，接入网设备可以包括基站、eNB、gNB。下面将主要以接入网设备为gNB举例。接入网设备的数量可以为多个，例如gNB1和gNB2等。UE的数量也可以包括多个，如ue1、ue2、ue3、ue4、ue5、ue6和ue7等。其中，ue1-ue5连接到gNB1，ue6和ue7连接到gNB2。图1所示的移动通信系统中还包括小区Cell1、Cell2和Cell3等。
小区(Cell)，又称蜂窝小区，是指在蜂窝移动通信系统中，其中的一个接入网设备或接入网设备的一部分(扇形天线)所覆盖的区域，在这个区域内UE可以通过无线信道与接入网设备进行通信。如图1所示，接入网设备gNB1覆盖的小区包括Cell1和Cell2，gNB2覆盖的小区包括Cell3。在Cell1内，ue1和ue2可以通过无线信道与gNB1通信。在Cell2内，ue3、ue4和ue5可以通过无线信道与gNB1进行通信。在Cell3内，ue6和ue7可以通过无线信道与gNB2进行通信。
图1所示的移动通信系统，UE对应连接的小区或接入网设备并不是固定不变的，UE可以进行小区切换，以切换至不同的小区与接入网设备进行通信。
小区切换(HandOver，HO)，是指移动通信系统内，UE在无线接入网的控制下完成从源小区(Source Cell)到目标小区(Target Cell)的无线链路连接的迁移，在不同小区无线的信道之间交换一个正在进行中的通话或数据传输，以保证通信的连续性。UE进行小区切换所涉及的切换流程通常包括切换准备、切换执行和切换完成三个阶段。UE与接入网设备配合实现小区切换。UE在从源小区切换到目标小区前，可能还会先确定多个可以切换的候选小区，从多个候选小区中选择一个候选小区作为目标小区。
小区切换可以包括站内小区切换(Intra-CU mobility)和站间小区切换(Inter-CU mobility)。站内小区切换是指连接态的UE从某接入网设备的一个小区切换至该接入网设备的另一个小区，整个切换过程在一个接入网设备内。站间小区切换是指连接态的UE从某接入网设备的一个小区切换至另一接入网设备的另一个小区。
继续如图1所示，ue3处于Cell2和Cell1的覆盖区域内，Cell2和Cell1对应同一个接入网设备gNB1。ue3可以从Cell2切换至Cell1，实现站内小区切换。ue5处于Cell2和Cell3的覆盖区域内，Cell2对应gNB2，Cell3对应gNB3。ue5可以从Cell2切换至Cell3，实现站间小区切换。
现行标准下，小区切换技术主要涉及到层1/层2(又称层1层2、第1/2层或L1/L2等)触发的移动性管理(Layer 1/2Triggered Mobility management，LTM)和条件切换(Conditional HandOver，CHO)。其中，LTM或说LTM切换是基于如图2所示无线接口的协议层1和协议层2的测量结果进行切换，CHO或说CHO切换是基于协议层3的测量结果进行切换。后面所提到的CHO与CHO切换可以为同一指代，均是基于协议层3的测量结果触发的小区变更。LTM与LTM切换可以为同一指代，可以是指UE基于协议层1和协议层2的测量结果触发的小区变更，也可以是指UE基于网络指令的小区变更。
下面对无线接口的协议栈进行解释：
无线协议栈分为两个平面，即用户面(User Plane，UP)和控制面(Control Plane，CP)。用户面协议栈即用户数据传输采用的协议簇，控制面协议栈即系统的控制信令传输采用的协议簇。如图2所示，用户面协议栈从上到下依次包括：非接入(Non-Access Stratum，NAS)层、分组数据汇聚协议(Packet Data Convergence Contocol，PDCP)层、广播组播控制层BMC(Broadcast/Multicast Control)、无线连接控制(Radio Link Control，RLC)层、介质访问控制(Medium Access Control，MAC)层、物理(Physical，PHY)层。控制面协议栈从上到下依次包括：非接入(Non-Access Stratum，NAS)层、无线资源控制(Radio Resource Contocol，RRC)层、分组数据汇聚协议(Packet Data Convergence Protocol，PDCP)层、无线连接控制(Radio Link Control，RLC)层、介质访问控制(Medium Access Control，MAC)、物理(Phycical，PHY)层。
如图2所示，为了实现UE与接入网设备、核心网设备(如接入和移动管理(Access and Mobility Management Function，AMF))的通信，在UE侧，控制面协议栈位于UE内。在网络侧，RRC、PDCP、RLC、MAC和PHY位于接入网设备内，NAS位于核心网的接入移动管理网元(Access and Mobility Management Function，AMF)。
如图2所示，从功能上，上述协议层又可以分为三大协议层：物理层(L1)、数据链路层(L2)和网络层(L3)。其中，L1主要包括用于为高层业务提供传输的无线物理通道，即物理层PHY。L2包括MAC、RLC、BMC和PDCP四个层。L3包括接入层中的RRC层和NAS层，如NAS的CC(Call Control，呼叫控制)和MM(Mobility Management，移动性管理)。
下面将分别介绍UE执行LTM和UE执行CHO的具体实现方案。
一、UE执行LTM。
其中，本申请中的可以指：基于网络设备指示的LTM，或基于事件触发的CLTM。
UE执行网络设备指示的LTM可以包括：UE基于网络设备为配置的多个LTM候选小区，UE获取针对每个LTM候选小区的测量结果(可以称为每个LTM候选小区的L1测量结果)后上报网络设备，网络设备基于UE上报的L1测量结果，连续用MAC CE承载的切换命令触发移动性管理机制。切换命令可以用于指示UE从源小区切换到目标小区。可选的，网络设备在向UE发送切换命令之前，还会触发UE进行下行、上行同步。
其中，UE执行LTM切换小区的过程主要涉及三类条件：LTM的相关离开条件(Leaving Conditions)、LTM的相关进入条件(Entry Conditions)和LTM的执行条件(Execution Conditions)。UE执行LTM切换小区的过程中，依次满足LTM的相关触发条件、LTM的相关进入条件和LTM的执行条件，才能开始执行LTM。
LTM的执行条件可以包括LTM的相关触发事件是否满足，例如A3事件对应的判决不等式是否满足。LTM的执行条件可以包括：LTM的相关进入条件和LTM的相关离开条件。
其中，LTM的相关进入条件是指满足进入该事件的不等式且持续LTM的触发事件的触发时长TTT，进入LTM的触发事件的不等式为：Mn+Ofn+Ocn-Hys>Ms+Ofs+Ocs+Off。
UE满足LTM的相关离开条件，是指UE满足进入该触发事件的离开条件的不等式。触发事件的离开条件的不等式为：Mn+Ofn+Ocn+Hys<Ms+Ofs+Ocs+Off。
其中，Mn表示邻小区测量值(Reference Signal Received Power，RSRP)，Ofn表示邻小区频率偏置，在服务小区的邻区列表中配置，同频切换时该值为0。Ocn表示小区偏移量Cell Individual Offset，该值在服务小区的邻区列表中设置。Ms表示服务小区测量值RSRP。Ofs表示服务小区频率偏置，同频切换时该值为0。Hys表示A3事件迟滞值，该值在服务小区参数中。Ocs表示服务小区偏置Cell Specific Offse，小区属性参数中定义小区切换偏置cellIndividualOffset(Ocs)，一般用于负荷切换，一般不用。Off为A3事件偏置值，该值在服务小区参数中。Hys与Off的值，都是调大切换难度加大，调小难度变容易。
LTM涉及到的通信设备包括UE和网络设备gNB，网络设备分为源小区gNB和候选小区gNB，候选小区gNB又可以分为目标小区gNB和除了目标小区对应的接入网设备之外的接入网设备，记为潜在接入网设备或候选接入网设备。
应理解，本申请中，源小区还可以称为服务小区，是指UE当前驻留的小区或切换前驻留的小区，源小区对应的接入网设备可以指源接入网设备。目标小区可以为UE执行小区切换后驻留的小区，目标小区对应的接入网设备可以指目标接入网设备。本申请中提及的接入网设备如上文所述，可以为基站或下一代基站gNB等。
在CHO和LTM切换的基础上，还引入条件LTM或事件即CLTM，即UE基于事件触发执行LTM小区变更，UE自行衡量是否满足LTM的执行条件，在满足LTM的执行条件的情况下自行决定开始执行LTM。
LTM和CLTM的区别可以包括：LTM是指UE结合L1测量结果，基于网络设备的指示触发小区切换；CLTM是指UE结合L1测量结果自行衡量是否满足LTM的执行条件，在衡量满足LTM的执行条件时开始执行LTM。
如图3所示为基于LTM切换实现小区切换的主要信令交互图，图3仅保留了主要的通信设备UE、源小区gNB和目标小区gNB，其他网络设备所涉及的信令交互相对较少，仅以文字示意主要交互信令。如图3所示，UE执行LTM主要包括以下流程：
S301：UE向源小区gNB发送测量报告。
UE处于RRC连接态(UE in RRC_Connected)，接入源小区。UE与源小区gNB进行信令交互，实现UE由源小区切换到目标小区。
如图3所示，UE由源小区切换到目标小区的流程，主要分为四个阶段：LTM准备、早期同步、执行LTM切换和完成LTM切换。
在LTM准备阶段，UE对当前服务小区及其相邻小区进行测量，获取测量结果，如L1测量结果、参考信号接收功率RSRP、参考信号接收质量(Reference Signal Received Quality，RSRQ)等，根据测量结果获取测量报告，向源小区gNB发送测量报告。
相应的，源小区gNB接收测量报告，源小区gNB根据UE上报的L1测量结果和其他相关信息(如网络负载、服务质量要求等)，确定UE是否满足LTM的相关触发条件。LTM的相关触发条件可以包括：UE识别到需要低延迟服务、L1测量结果显示源小区网络信号质量较差等。
在源小区gNB确定UE满足LTM的触发条件的情况下，做出LTM切换决定(LTM Decision)，为UE配置LTM候选小区(LTM Candidate Preparation)以及其他信息。进一步的，源小区gNB还可以与LTM候选小区对应的接入网设备通信，准备切换过程，该过程可以包括资源预留、上下文信息切换。
S302：源小区gNB向UE发送RRC重配置消息。
相应的，UE接收RRC重配置消息。
其中，RRC重配置消息指示UE切换到目标小区。RRC重配置消息可以包括LTM候选小区的配置信息(LTM Candidatie configuration)，尤其是目标小区的配置信息。
源小区gNB向UE下发的RRC重配置消息还可以包括测量配置信息，例如需要测量的参考信号(Synchronization Signal Block，SSB)的相关信息、测量周期、报告触发条件等。
S303：UE向源小区gNB发送RRC重配置完成消息。
UE接收到源小区gNB发送的RRC重配置消息，获取其中的LTM候选小区或说目标小区的配置信息并存储。UE向源小区gNB发送RRC重配置完成消息。这样，即完成了LTM准备阶段，进入早期同步阶段。
S304：UE发送上行同步信号和下行同步信号。
UE在接收到RRC重配置消息后，执行切换动作，例如断开与源小区的连接，并尝试接入目标小区。UE还会与目标小区gNB分别进行上行同步(UL synchronization with LTM candidate cells)和下行同步(DL synchronization with LTM candidate cells)。
此外，UE也可以向其他候选小区gNB进行上行同步和下行同步，以减少切换小区后的信息延时，实现信息同步。
S305：UE向源小区gNB上报L1测量结果。
UE完成上行同步和下行同步，进入执行LTM小区切换阶段。UE进行L1测量，得到L1测量结果。源小区gNB根据L1测量结果评估无线信号的质量，并作为网络切换决策和调整传输参数的依据。
在源小区gNB向UE下发的RRC重配置消息包括测量配置信息的情况下，UE根据测量配置信息，周期性地、或基于事件地测量其接收到的参考信号的相关指标。UE获取的测量结果满足预设的报告条件，例如达到特定的门限值或发生了特定的事件，生成携带L1测量结果的测量报告，将测量报告上报源小区gNB。
S306：源小区gNB向UE发送LTM切换指令。
源小区gNB接收到UE上报的测量报告，可以基于L1测量结果衡量LTM候选小区是否满足LTM的执行条件，在衡量满足LTM的执行条件时做出执行LTM切换的决定，通过RRC信令向UE下发执行LTM切换的指令(LTM Cell switch command)，指示UE执行LTM切换，从源小区切换到目标小区。
具体的，源小区gNB可以通过介质访问控制中的控制元素(Medium Access Control Control Element，MCA CE)携带LTM切换指令下发给UE。当然，源小区gNB也可以通过其他方式下发LTM切换指令给UE，不作限定。
S307：UE接收LTM切换指令，向目标小区gNB网络设备发起随机接入。
UE接收到源小区gNB下发的LTM切换指令，可以执行切换过程，例如，UE可以开始执行脱离源小区(Detach from source)，请求配置目标小区(Apply target configurations)的操作。
UE向目标小区gNB发起随机接入(Random Access Channel，RACH)，以使得目标小区gNB接收UE的连接建立消息，确认是否接受连接请求。目标小区gNB在确定接受UE的连接请求，发送连接建立确认消息给UE，同时携带目标小区gNB分配给UE的资源和配置信息。例如，目标小区gNB通过物理下行控制信道(Physical Downlink Control Channel，PDCCH)发送随机接入响应，包含同步信息和上行授权。
UE向目标小区gNB发起随机接入以便在目标小区完成注册和资源分配。这样，UE完成了LTM切换，从源小区切换到目标小区。UE结束执行LTM小区切换的阶段，进入完成LTM小区切换的阶段。
S308：UE向目标小区gNB发送RRC重配置完成消息。
UE根据源小区gNB下发的LTM切换指令，断开与源小区的连接，由源小区切换到目标小区。UE在目标小区完成随机接入过程，UE会向目标小区gNB发送RRC重配置完成消息(LTM Cell Switch Completion)，指示UE完成LTM切换。具体的，UE可以发送RRC重配置完成信息给目标小区gNB。
目标小区gNB接收到UE的RRC重配置完成消息后，确认UE已经成功切换到目标小区，并准备好进行数据传输。目标小区gNB会向核心网发送切换请求，以便将用户面数据路径切换到目标小区。核心网在确认用户面数据路径切换成功后，会通知目标小区gNB。源小区gNB在断开与UE连接后，可以释放UE之前占用的资源。
UE执行LTM切换小区，可以减少切换中断时间和服务中断，优化延迟性能。通过减少切换过程中的中断，提高了实时服务如语音和视频通话的连续性。适用于超可靠低延迟通信场景，支持关键任务型服务的性能要求。
二、UE执行CHO。
UE执行CHO是指基于网络设备配置的多个CHO候选小区，衡量在满足某些条件时自行决定是否执行小区切换。UE执行LTM切换小区的过程主要涉及三类条件：CHO的相关触发条件(Leaving Conditions)、CHO的相关进入条件(Entry Conditions)和CHO的执行条件(Execution Conditions)。UE执行CHO切换小区的过程中，依次满足CHO的相关触发条件、CHO的相关进入条件和CHO的执行条件，才能开始执行CHO。
CHO的执行条件可以参照前述LTM的执行条件，或相关标准或通信协议的相关规定，不作赘述。
CHO涉及到的通信设备包括UE和网络设备gNB，网络设备分为源小区gNB和候选小区gNB，候选小区gNB又可以分为目标小区gNB和除了目标小区之外的小区网络设备，记为潜在小区gNB。
如图4所示为基于CHO实现小区切换的主要信令交互图，图4中仅保留了主要的通信设备UE、源小区gNB和目标小区gNB，其他网络设备所涉及的信令交互相对较少，仅以文字示意主要交互信令。如图4所示，UE完成CHO切换主要包括以下流程：
S401：UE向源小区发送gNB发送测量报告。
UE处于RRC连接态(UE in RRC_Connected)，接入源小区。UE与源小区gNB进行信令交互，实现UE由源小区切换到目标小区。
在CHO准备阶段，UE对当前服务小区及其相邻小区进行测量，获取测量结果，如RSRP、RSRQ等，根据测量结果获取测量报告，向源小区gNB发送测量报告。
S402：源小区gNB向UE发送RRC重配置信息。
源小区gNB根据UE上报的测量结果和其他相关信息(如网络负载、服务质量要求等)，决定是否满足CHO的相关触发条件。源小区gNB确定UE满足CHO的相关触发条件，做出CHO切换决定(CHO Decision)，为UE配置CHO，包括配置CHO候选小区(CHO Candidate Preparation)及其他信息。源小区gNB会向包括目标小区网络设备的候选小区网络设备进行通信，准备切换过程，主要包括资源预留、上下文信息切换。
源小区gNB向UE发送RRC重配置消息，指示UE重配置CHO。RRC重配置包括CHO候选小区的配置信息(CHO Candidatie Configuration)，尤其是目标小区的配置信息。
S403：UE向源小区gNB发送RRC重配置完成消息。
UE接收到源小区gNB发送的RRC重配置消息，获取其中的CHO候选小区的配置信息并存储。UE向源小区gNB发送RRC重配置完成消息。这样，即完成了CHO准备阶段。
S404：UE衡量是否满足CHO的执行条件。
RRC重配置信息还可以包括UE执行CHO需要满足的执行条件，CHO的执行条件可以包括CHO的触发事件。UE在接收到CHO配置后，开始基于信号质量、信号强度、时间对准或其他自定义参数评估候选小区的CHO的执行条件，并在满足条件时执行CHO。
区别于LTM，UE可以根据测量结果等参数，自行衡量是否满足CHO的执行条件，并在衡量满足CHO的执行条件的情况下，开始执行CHO切换。
S405：UE向目标小区gNB发起随机接入请求。
S406：目标小区gNB响应UE的随机接入请求，为UE分配资源，完成CHO切换。
UE确定执行CHO切换，开始脱离源小区(Detach from source)，请求配置目标小区(Apply target configurations)的操作。
UE向目标小区gNB发起随机接入(Random Access Channel，RACH)，以使得目标小区gNB接收UE的连接建立消息，确认是否接受连接请求。目标小区gNB在确定接受UE的连接请求，发送连接建立确认消息给UE，同时携带目标小区gNB分配给UE的资源和配置信息。例如，目标小区gNB通过物理下行控制信道(Physical Downlink Control Channel，PDCCH)发送随机接入响应，包含同步信息和上行授权。
UE向目标小区gNB发起随机接入以便在目标小区完成注册和资源分配。这样，UE完成了CHO切换，从源小区切换到目标小区。UE结束执行CHO小区切换的阶段，进入完成LTM小区切换的阶段。
S407：UE向目标小区gNB发送RRC重配置完成消息。
UE衡量是否满足CHO的执行条件，在满足CHO自行条件时开始执行CHO切换。具体的，终端断开与源小区的连接，由源小区切换到目标小区。UE在目标小区完成随机接入过程，UE会向目标小区gNB发送RRC重配置完成消息，指示UE完成CHO切换(CHO Cell Switch Completion)。具体的，UE可以发送RRC重配置完成信息给目标小区gNB。
目标小区gNB接收到UE的RRC重配置完成消息后，确认UE已经成功切换到目标小区，并准备好进行数据传输。目标小区gNB会向核心网发送切换请求，以便将用户面数据路径切换到目标小区。核心网在确认用户面数据路径切换成功后，会通知目标小区gNB。源小区gNB在断开与UE连接后，可以释放UE之前占用的资源。
UE执行CHO切换，UE可以在满足特定条件时快速响应并执行切换，减少了对网络切换命令的依赖，从而可以减少切换时延和提高切换成功率。CHO切换机制特别适用于高速移动场景或网络覆盖边缘区域，其中信号条件可能迅速变化。
UE执行CHO切换小区，允许UE在满足特定条件时自行触发切换，减少了等待网络切换命令的延迟。UE所采用的切换条件可以更灵活地响应无线环境变化，提高切换的成功率和网络效率。UE可以快速响应信号变化，适用于高速移动性场景，如列车或汽车等。
目前，UE可以同时配置LTM和CHO，在LTM与CHO共存的情况下，UE可能会存在执行LTM和CHO的冲突情况，例如，UE与源小区建立RRC连接的情况下，UE可以获取源小区gNB配置的LTM候选小区，UE根据源小区gNB的网络指示，通过执行LTM，由源小区切换至一个目标小区，目标小区为LTM候选小区中的一个候选小区。同时，UE也可以获取源小区gNB配置的CHO候选小区，UE自行衡量是否满足切换至目标小区的执行条件，在满足执行条件的情况下，由源小区切换至目标小区，目标小区为CHO候选小区中的一个候选小区。UE执行LTM切换到的目标小区与UE执行CHO切换到的目标小区可能相同或不同，在切换到的小区是不同的情况下，会导致切换冲突，导致小区切换的效率较差。
基于此，本申请实施例提供一种通信方法，针对终端同时配置了CHO和LTM的情况下，终端接收第一信息，根据第一信息执行CHO或LTM，以有效解决共存的两种切换方式存在切换冲突的技术问题。需要说明的是，本实施例所提到的LTM，可以是基于网络指示触发的LTM，也可以是基于UE衡量事件触发的LTM或CLTM，不作限定。
下面以终端为UE，网络设备为UE配置LTM和CHO，UE可以支持LTM和CHO两种小区切换方案为例，结合图1所示通信系统对本申请所述的通信方法进行描述。图5为本申请提供的一种通信方法的流程示意图，如图5所示，所述通信方法可以包括以下步骤：
S501：UE获取第一信息。
其中，第一信息可以用于指示UE执行LTM或CHO。
本申请中，第一信息可以是网络设备发送给UE，也可以是预配置的，如预配置在UE的通信模块内或通信协议内，又可以是协议规定的，不作限定。
可选的，UE可以在出厂后首次连网时获取第一信息，或，UE也可以在每次开机后获取第一信息。或，UE也可以在接入源小区时获取源小区gNB发送的第一信息，或，UE也可以在源小区质量较差需要更换质量更好的服务小区时，获取源小区gNB发送的第一信息。
本申请中，第一信息可以直接指示UE执行LTM或直接指示UE执行CHO；或，第一信息指示切换选择相关的信息，例如指示等待时长、切换选择规则、依据参数等切换选择相关的信息，通过第一信息指示的切换选择相关的信息间接指示UE执行LTM或CHO。
S502：UE根据第一信息，执行LTM或CHO。
UE根据第一信息，执行LTM或CHO中的一种切换方案，由源小区切换至目标小区。UE根据第一信息执行LTM，切换的目标小区为LTM候选小区中的某一个小区。UE根据第一信息执行CHO，切换的目标小区为CHO候选小区中的某一个小区。在某些情况下，UE衡量的候选小区，可能同时配置有CHO的执行条件和LTM的执行条件，即该候选小区同时为LTM候选小区和CHO候选小区。
其中，UE执行LTM的过程、执行CHO的过程可以参照上文所述，在此不予赘述。
需要说明的是，第一信息用于指示UE选择执行LTM或CHO，是指UE开始执行LTM或CHO，或UE开始衡量是否满足LTM或CHO的执行条件，并不限定为UE一定能通过执行LTM或CHO成功切换至目标小区。
例如，第一信息指示UE执行CHO可以是指UE开始衡量是否满足CHO的执行条件，或在衡量满足CHO的执行条件后开始执行CHO切换，但并不限定为UE一定能成功切换至CHO候选小区中的目标小区。
在一种情况下，终端可以是在每次需要切换目标小区的情况下，获取第一信息，根据第一信息立即确定切换方案，并执行所确定的切换方案。也就是说，终端获取的第一信息，可以仅用于当前小区切换场景下的切换决策。
在另一种情况下，终端也可以在接收第一信息后，不立即执行小区切换。终端在后续每次需要执行小区切换时，根据该第一信息执行LTM或CHO。也就是说，终端所获取的第一信息，可以复用于多次小区切换场景下的切换决策。
UE采用CHO切换小区，允许UE在满足特定条件时自行触发切换，减少了等待网络切换命令的延迟。UE采用LTM切换小区，可以减少切换中断时间和服务中断，优化延迟性能。通过减少切换过程中的中断，提高了实时服务如语音和视频通话的连续性。UE配置CHO和LTM，可以在不同场景下采用不同的小区切换方案，且通过第一信息选择执行CHO和LTM中的一种，避免可能导致的切换冲突。
进一步的，UE在基于第一信息执行LTM或CHO之后，还可以上报指示信息，该指示信息可以包括或用于指示UE执行LTM或CHO的事件上报和/或配置索引。事件上报可以用于指示LTM对应的触发事件的类型或标识，或CHO对应的触发事件的类型或标识。配置索引可以为UE执行的LTM配置的LTM候选小区的索引或标识，或为UE执行的CHO配置的CHO候选小区的索引或标识。
例如，UE根据第一信息执行CHO，UE上报的指示信息可以包括UE执行CHO的事件上报和/或配置索引。再例如，UE根据第一信息执行LTM，UE上报的指示信息可以包括UE执行LTM的事件上报和/或配置索引。
在其他情况下，第一信息也可以上报UE未执行的切换方案的事件上报和/或索引。例如，UE根据第一信息执行CHO，UE上报的指示信息可以包括UE未执行LTM的事件上报和/或配置索引。再例如，UE根据第一信息执行LTM，UE上报的指示信息可以包括UE执行CHO的事件上报和/或配置索引。
可选的，UE可以在开始执行切换时且与源小区连接未断开的情况下，向源小区gNB上报指示信息。或，UE也可以在执行切换成功后，向目标小区gNB上报指示信息。
在上述实施方式的基础上，UE还可以接收网络设备发送的配置信息，配置信息用于为UE同时配置CHO和LTM。UE接收网络设备发送的配置信息的方式可以有多种。
比如，配置信息为一个，该配置信息包括CHO的配置参数和LTM的配置参数，如此可以节省信令开销。或，配置信息为多个，该配置信息包括CHO的配置信息和LTM的配置信息，以区分不同的切换方式对应的配置信息，其中CHO的配置信息和LTM的配置信息可以同时发送，也可以不同时发送，不予限制。进一步的，UE基于CHO的配置参数配置CHO。UE基于LTM的配置参数配置LTM。
一种可能的设计，用于为UE同时配置CHO和LTM的配置信息和第一信息可以携带在同一消息中发送给UE，该消息可以称为重配置信息，该重配置信息包括了第一信息、CHO的配置参数和LTM的配置参数。UE可以基于该重配置信息中的CHO的配置参数，配置CHO。基于LTM的配置参数配置LTM。并在配置LTM和CHO后，基于第一信息选择执行LTM或CHO，从源小区切换至目标小区。如此可以节省信令开销。
本实施例提供的通信方法，UE在配置了CHO和LTM的情况下，可以在不同的切换场景或业务需求下选择不同的切换方案。UE根据第一信息选择执行CHO或LTM，有效避免两种切换方案共存导致的切换冲突，提高小区切换效率。
下面将通过一个具体示例解释本实施例提供的通信方法的信令交互流程。如图6所示，所涉及到的通信设备可以包括UE和网络设备gNB，网络设备包括源小区gNB、LTM对应的目标小区gNB和CHO对应的目标小区gNB。如图6所示为基于第一信息实现小区切换的主要信令交互图，仅以文字示意主要交互信令。如图6所示，UE完成小区切换主要包括以下流程：
S601：UE向源小区gNB发送测量报告。
UE处于RRC连接态(UE in RRC_Connected)，接入源小区。UE与源小区gNB进行信令交互，实现UE由源小区切换到目标小区。
在CHO和LTM准备阶段，UE对当前服务小区及其相邻小区进行测量，获取LTM候选小区的L1测量结果和CHO候选小区的L3测量结果。此外，UE也可以获取如参考信号接收功率(Reference Signal Received Power，RSRP)、参考信号接收质量(Reference Signal Received Quality，RSRQ)等，将测量结果携带在测量报告中，向源小区gNB发送测量报告。
S602：源小区gNB接收测量报告，向UE发送重配置信息。
其中，源小区gNB可以根据UE上报的测量结果和其他相关信息(如网络负载、服务质量要求等)，并为UE配置CHO候选小区(CHO Candidate Preparation)和LTM候选小区。源小区gNB向UE发送重配置信息，重配置信息可以包括CHO的配置参数和LTM的配置参数。还可以包括执行CHO切换的阈值和LTM切换的阈值。
其中，CHO的配置参数包括CHO候选小区的相关信息，LTM的配置参数包括LTM的候选小区的相关信息。CHO的配置参数和LTM的配置参数的相关描述参照上文，不予赘述。
其中，第一信息指示UE执行LTM或CHO。
此外，源小区gNB还会向包括CHO目标小区gNB和LTM目标小区gNB进行通信，为UE切换小区作准备，所涉及的准备操作可以主要包括资源预留、上下文信息切换等。
可替换的，源小区gNB也可以单独向UE发送包括CHO的配置参数和LTM的配置参数的重配置信息，以及单独发送第一信息。或，源小区gNB也可以单独向UE发送包括CHO的配置参数的重配置信息，以及，单独发送包括LTM的配置参数的重配置信息，并单独发送第一信息。或，源小区gNB也可以通过其他的信息组合方式向UE单独发送或组合发送重配置信息，不作限定。
S603：UE接收重配置信息，向源小区gNB发送RRC重配置完成消息。
UE接收到源小区gNB发送的RRC重配置消息，获取其中的LTM的配置参数和CHO的配置参数，获取LTM的候选小区和CHO的候选小区的配置信息并存储。UE向源小区gNB发送RRC重配置完成消息。这样，即为完成了CHO和LTM准备阶段。
S604：UE根据第一信息决定执行CHO或LTM。
如图6所示，UE决定执行LTM，执行S605A、S606A和S607A。
S605A：UE向LTM目标小区gNB发起随机接入请求。
S606A：LTM目标小区gNB响应UE的随机接入请求，为UE分配资源，完成LTM切换。
S607A：UE向LTM目标小区gNB发送RRC重配置完成消息。
UE确定执行LTM，开始脱离源小区(Detach from source)，应用目标小区配置(Apply target configurations)的操作。
UE向LTM目标小区gNB发起随机接入(Random Access Channel，RACH)，以使得LTM目标小区gNB接收UE的连接建立消息，确认是否接受连接请求。LTM目标小区gNB在确定接受UE的连接请求，发送连接建立确认消息给UE，同时携带LTM目标小区gNB分配给UE的资源和配置信息。例如，LTM目标小区gNB通过物理下行控制信道(Physical Downlink Control Channel，PDCCH)发送随机接入响应，包含同步信息和上行授权。
UE向LTM目标小区gNB发起随机接入以便在目标小区完成注册和资源分配。这样，UE完成了LTM切换，从源小区切换到LTM目标小区。
如图6所示，UE决定执行CHO，执行S605B、S606B和S607B。
S605B：UE向CHO目标小区gNB发起随机接入请求。
S606B：CHO目标小区gNB响应UE的随机接入请求，为UE分配资源，完成CHO切换。
S607B：UE向CHO目标小区gNB发送RRC重配置完成消息。
UE确定执行CHO切换，开始脱离源小区(Detach from source)，请求配置CHO目标小区(Apply target configurations)的操作。
UE向CHO目标小区gNB发起随机接入，以使得CHO目标小区gNB接收UE的连接建立消息，确认是否接受连接请求。CHO目标小区gNB在确定接受UE的连接请求，发送连接建立确认消息给UE，同时携带CHO目标小区gNB分配给UE的资源和配置信息。例如，CHO目标小区gNB通过物理下行控制信道(Physical Downlink Control Channel，PDCCH)发送随机接入响应，包含同步信息和上行授权。
UE向CHO目标小区gNB发起随机接入以便在目标小区完成注册和资源分配。这样，UE完成了CHO切换，从源小区切换到目标小区。
如上所述，第一信息可以直接指示UE执行LTM或直接指示UE执行CHO；或，第一信息指示切换选择相关的信息，例如指示等待时长、切换选择规则、依据参数等切换选择相关的信息，以通过第一信息指示的切换选择相关的信息间接指示UE执行LTM或CHO，进而实现为UE配置CHO和LTM的情况下，UE可以基于第一信息的指示，判断执行LTM或CHO，以避免可能产生的切换冲突问题，提高了小区切换效率。下面将针对第一信息可能包括的信息类型，结合几个实施例介绍UE根据第一信息执行LTM或CHO的过程：
实施例1，第一信息用于指示或包括定时器的时长。或可以理解为第一信息用于指示或包括一个时长，该时长可以用于配置定时器的时长。
本申请中，定时器可以用于延迟触发其中一种切换方式，优先触发另一种切换方式。比如：定时器可以用于延迟触发LTM，优先触发CHO；或，定时器用于延迟触发CHO，优先触发LTM。具体的，采用定时器的哪种作用可以是协议规定或预先配置，不予限制。
UE基于通信协议与网络设备进行通信。本方案中，UE所应用的通信协议，约定UE基于第一信息，选择执行LTM或CHO的具体通信方法或通信规则。
UE获取的第一信息包括定时器的时长。UE所应用的通信协议可以规定定时器的启动条件和结束条件。通信协议的相关通信规则可以指示UE优先触发CHO，基于此，定时器可以用于延迟触发LTM，以实现优先触发CHO。或，通信协议的相关通信规则可以指示UE优先触发LTM，基于此，定时器用于延迟CHO，以实现优先触发LTM。通信协议指示优先触发的切换类型不同，定时器的启动条件和结束条件也不同。
下面对UE利用定时器优先执行CHO和UE利用定时器优先执行LTM进行介绍：
第一方面，UE优先执行CHO。
本申请中，UE优先执行CHO，也可以理解为UE延迟触发LTM。
在一种示例中，第一信息包括第一时长，第一时长为第一定时器(timer)的时长。
一种可能的设计中，第一定时器的启动条件包括：UE得到L1测量结果或UE满足LTM的执行条件。即UE得到L1测量结果或UE满足LTM的执行条件时，启动第一定时器。
即本方案中，UE配置了LTM和CHO，UE在得到L1测量结果后不会立即触发衡量是否满足LTM的相关进入条件，或，UE在衡量满足LTM的执行条件时不会立即触发执行LTM，而是先启动第一定时器，开始等待，在等待一段时间(可以称为第一等待时间)后，结束等待，再选择触发衡量是否满足LTM的相关进入条件，或再选择执行LTM或CHO。
又一种可能的设计中，第一定时器的启动条件包括：UE满足LTM的执行条件，且在满足LTM的执行条件的LTM候选小区为CHO候选小区的情况下，启动第一定时器。也就是说，UE当前衡量的候选小区若配置了CHO的执行条件和LTM的执行条件，UE则可以在满足LTM的执行条件时启动第一定时器，延迟触发LTM，开始等待，在等待一段时间(可以称为第一等待时间)后再选择触发衡量是否满足LTM的相关进入条件，或在等待一段时间后再选择执行LTM或CHO。
本申请中，第一等待时间可以小于或等于第一时长，即UE的实际等待时长不一定为第一时长。UE的等待时长可能小于第一定时器的时长，UE可能在第一定时器超时前(即第一定时器运行期间)结束等待，开始触发衡量是否满足LTM的相关进入条件，或开始选择执行LTM或CHO。或，UE的等待时长等于第一定时器的时长，即在第一定时器超时后结束等待，开始触发衡量是否满足LTM的相关进入条件，或开始选择执行LTM或CHO。
具体的，UE可以根据第一定时器的结束条件是否被满足，确定是否结束等待。
一种示例中，第一定时器的结束条件包括：如果在第一定时器运行期间，满足CHO的执行条件，则执行CHO，结束/停止运行定时器；或，如果第一定时器运行期间不满足CHO的执行条件，则执行LTM，结束/停止运行定时器。
例如，UE启动第一定时器后，开始衡量是否满足CHO的执行条件。如果在第一定时器运行期间，UE衡量候选小区满足CHO的执行条件，则可以在衡量满足CHO的执行条件时开始执行CHO。这种情况下，UE无需等待第一定时器超时，UE的实际等待时长(如第一等待时间)小于第一时长。
又例如，如果在第一定时器运行期间，UE衡量候选小区一直不满足CHO的执行条件，UE可以执行LTM。具体的，UE可以在第一定时器超时后或超时的时刻开始执行LTM。这种情况下，UE的实际等待时长等于第一时长。
第一方面中，第一信息指示的第一时长，可以为LTM的触发事件的触发时长(Time To Trigger，TTT)。也就是说，UE在得到L1测量结果时，开启第一定时器，在LTM的TTT内，UE不满足CHO的执行条件，UE会在等待TTT后执行LTM。在LTM的TTT内，UE满足CHO的执行条件，UE则开始执行CHO，不需要再等待第一定时器超时，也不需要执行LTM。
例如，UE在执行LTM对应的L1测量时，测得候选小区cell1的波束beam 1已满足执行条件，但cell1的beam1有配置对应CHO的L3执行条件。这种情况下，UE在基于L1测量结果确定满足LTM的执行条件时，启动第一定时器。例如，第一定时器可以为CHO的执行条件内的目标切换时长TTT，或与TTT等值的等待时长。
第一定时器超时前，若UE衡量L3测量结果满足CHO的执行条件，则执行CHO。第一定时器超时后，UE衡量L3测量结果仍未满足CHO的执行条件，则执行LTM。
如图7所示，为UE基于第一时长执行LTM或CHO的示意图。UE在t0得到L1测量结果或满足LTM的的执行条件时，启动第一定时器，第一定时器的时长为第一时长T10，第一时长可以为LTM的TTT。
在第一定时器运行期间，如果UE在t1满足CHO的执行条件，UE即可开始执行CHO。这种情况下，UE实际等待时长T11小于第一时长T10。
在第一定时器运行期间，UE不满足CHO的执行条件，则在第一定时器超时即t2执行LTM。UE的实际等待时长T12等于第一时长T10。
本示例提供的方案，UE接收的第一信息包括第一定时器的第一时长，第一时长可以为LTM的TTT。UE在得到L1的测量结果或满足LTM的执行条件时启动第一定时器，在等待一段时间后，根据CHO的执行条件的满足情况，执行LTM或CHO。UE通过延迟触发或开始执行LTM，达到优先执行CHO的技术效果。
在另一种示例中，第一信息包括第二时长，第二时长为第二定时器的时长。
一种可能的设计中，第二定时器的启动条件包括：UE满足CHO的相关进入条件和LTM的执行条件。
本方案中，UE配置了LTM和CHO。UE在满足LTM的执行条件和CHO的相关进入条件，不立即开始执行LTM，而是先启动第二定时器，在等待一段时间后再选择执行LTM或CHO。
例如，UE可以在满足CHO的相关进入条件时，启动第二定时器，第二定时器的时长为CHO的触发事件的TTT。在CHO的TTT内，UE衡量是否满足LTM的执行条件，在满足LTM的执行条件时启动第二定时器。第二定时器的第二时长可以小于CHO的TTT。
UE在CHO的TTT内，在满足LTM的执行条件时启动第二定时器开始等待，UE的实际等待时长可能等于第二时长，也可能不等于第二时长。UE根据第二定时器的结束条件是否满足，确定是否结束等待。
在一种示例中，第二定时器的结束条件包括：在第二定时器运行期间，如果满足CHO的相关离开条件和LTM的执行条件，则执行LTM。
UE配置第二定时器T_w，T_w的时长可以小于CHO的执行条件内的TTT。如果UE满足了CHO的相关进入条件，且满足LTM的执行条件，则启动T_w。若在T_w时间内满足CHO的相关离开条件且L1测量结果仍满足LTM的执行条件，则执行LTM。若L1测量结果在T_w里一直满足LTM的执行条件，则在T_w超时后执行LTM。
如图8所示，UE在t0满足CHO的相关进入条件，启动定时器，定时器的时长为CHO的TTT。UE在CHO的TTT运行期间，衡量是否满足LTM的执行条件。如果UE在t1满足LTM的执行条件，UE启动第二定时器，第二定时器的时长T20，T20小于CHO的TTT，第二定时器的结束时刻t3早于CHO的TTT的结束时刻t4。
在第二定时器运行期间，UE衡量候选小区是否满足CHO的相关离开条件，如果在第二定时器超时前，UE在t2衡量满足CHO的相关离开条件，且UE还持续满足LTM的执行条件，UE则停止等待，开始执行LTM。这种情况下，UE的实际等待时长T21，T21小于T20。
在第二定时器运行期间，UE衡量候选小区不满足CHO的相关离开条件。在第二定时器超时即t3，UE仍不满足CHO的相关离开条件，且UE持续满足LTM的执行条件，UE则在第二定时器超时后执行LTM。这种情况下，UE的实际等待时长T22，T22等于T20。
在其他实施方式中，还可能存在CHO的TTT的结束时刻早于第二定时器的超时时刻的情况。这种情况下，UE可以在CHO的TTT超时的时候，就开始执行LTM。当然，UE也可以等待第二定时器超时的时候，再开始执行LTM。
本示例提供的通信方法，UE在满足CHO的相关进入条件后的TTT运行期间，在衡量满足LTM的执行条件后启动第二定时器，在第二定时器运行期间衡量是否满足CHO的相关离开条件，并在满足CHO的相关离开条件时或在第二定时器超时的时候开始执行LTM。
在另一种示例中，第二定时器的结束条件包括：在第二定时器运行期间，如果满足LTM的执行条件，在第二定时器超时后执行LTM。
如图9所示，UE在CHO的TTT运行期间，衡量是否满足LTM的执行条件。如果UE在t1满足LTM的执行条件，EU启动第二定时器，第二定时器的时长T20小于CHO的TTT，第二定时器的结束时刻t2早于CHO的TTT的结束时刻t3。
在第二定时器运行期间，UE衡量候选小区是否满足LTM的执行条件。如果在第二定时器运行期间，UE衡量候选小区持续满足LTM的执行条件，则在第二定时器超时后即t2执行LTM。这种情况下，UE的实际等待时长T22等于T20。
在其他实施方式中，还可能存在CHO的TTT早于第二定时器的超时时刻的情况。这种情况下，UE可以在CHO的TTT超时的时候，就开始执行LTM。当然，UE也可以等待第二定时器超时的时候，再开始执行LTM。
本示例提供的通信方法，UE在满足CHO相关进入条件后的TTT运行期间，在衡量满足LTM的执行条件后启动第二定时器，在第二定时器运行期间衡量是否持续满足LTM的执行条件，并在持续满足LTM的执行条件的情况下，在第二定时器超时的时候开始执行LTM。
第二方面，UE优先执行LTM。
本申请中，UE优先执行LTM，也可以理解为UE延迟触发CHO。
在一种示例中，第一信息包括第一时长，第一时长为第一定时器(timer)的时长。
一种可能的设计中，第一定时器的启动条件包括：UE得到L3测量结果或UE满足CHO的执行条件。即UE得到L3测量结果或UE满足CHO的执行条件时，启动第一定时器。
即本方案中，UE配置了CHO和LTM，UE在得到L3测量结果后不会立即触发衡量是否满足CHO的相关进入条件，或，UE在衡量满足CHO的执行条件时不会立即触发执行CHO，而是先启动第一定时器，开始等待，在等待一段时间(可以称为第一等待时间)后，结束等待，再选择触发衡量是否满足CHO的相关进入条件，或再选择执行CHO或LTM。
又一种可能的设计中，第一定时器的启动条件包括：UE满足CHO的执行条件，且在满足CHO的执行条件的CHO候选小区为LTM候选小区的情况下，启动第一定时器。也就是说，UE当前衡量的候选小区若配置了LTM的执行条件和CHO的执行条件，UE则可以在L3测量结果满足CHO的执行条件时启动第一定时器，延迟触发CHO，开始等待，在等待一段时间(可以称为第一等待时间)后再选择触发衡量是否满足CHO的相关进入条件，或在等待一段时间后再选择执行CHO或LTM。
本申请中，第一等待时间可以小于或等于第一时长，即UE的实际等待时长不一定为第一时长。UE的等待时长可能小于第一定时器的时长，UE可能在第一定时器超时前(即第一定时器运行期间)结束等待，开始触发衡量是否满足CHO的相关进入条件，或开始选择执行CHO或LTM。或，UE的等待时长等于第一定时器的时长，即在第一定时器超时后结束等待，开始触发衡量是否满足CHO的相关进入条件，或开始选择执行CHO或LTM。
具体的，UE可以根据第一定时器的结束条件是否被满足，确定是否结束等待。
一种示例中，第一定时器的结束条件包括：如果在第一定时器运行期间，满足LTM的执行条件，则执行LTM，结束/停止运行定时器；或，如果第一定时器运行期间不满足LTM的执行条件，则执行CHO，结束/停止运行定时器。
例如，UE启动第一定时器后，开始衡量是否满足LTM的执行条件。如果在第一定时器运行期间，UE衡量候选小区满足LTM的执行条件，则可以在衡量满足LTM的执行条件时开始执行LTM。这种情况下，UE无需等待第一定时器超时，UE的实际等待时长(如第一等待时间)小于第一时长。
又例如，如果在第一定时器运行期间，UE衡量候选小区一直不满足LTM的执行条件，UE可以执行CHO。具体的，UE可以在第一定时器超时后或超时的时刻开始执行CHO。这种情况下，UE的实际等待时长等于第一时长。
第一方面中，第一信息指示的第一时长，可以为CHO的触发事件的触发时长(Time To Trigger，TTT)。也就是说，UE在得到L3测量结果时，开启第一定时器，在CHO的TTT内，UE不满足LTM的执行条件，UE会在等待TTT后执行CHO。在CHO的TTT内，UE满足LTM的执行条件，UE则开始执行LTM，不需要再等待第一定时器超时，也不需要执行CHO。
例如，UE在执行CHO对应的L3测量时，测得候选小区celL3的波束beam 1已满足执行条件，但celL3的beam1有配置对应LTM的L1执行条件。这种情况下，UE在基于L3测量结果确定满足CHO的执行条件时，启动第一定时器。例如，第一定时器可以为LTM的执行条件内的目标切换时长TTT，或与TTT等值的等待时长。
第一定时器超时前，若UE衡量L1测量结果满足LTM的执行条件，则执行LTM。第一定时器超时后，UE衡量L1测量结果仍未满足LTM的执行条件，则执行CHO。
如图7所示，为UE基于第一时长执行CHO或LTM的示意图。UE在t0得到L3测量结果或满足CHO的的执行条件时，启动第一定时器，第一定时器的时长为第一时长T10，第一时长可以为CHO的TTT。
在第一定时器运行期间，如果UE在t1满足LTM的执行条件，UE即可开始执行LTM。这种情况下，UE实际等待时长T11小于第一时长T10。
在第一定时器运行期间，UE不满足LTM的执行条件，则在第一定时器超时即t2执行CHO。UE的实际等待时长T12等于第一时长T10。
本示例提供的方案，UE接收的第一信息包括第一定时器的第一时长，第一时长可以为CHO的TTT。UE在得到L3的测量结果或满足CHO的执行条件时启动第一定时器，在等待一段时间后，根据LTM的执行条件的满足情况，执行CHO或LTM。UE通过延迟触发或开始执行CHO，达到优先执行LTM的技术效果。
在另一种示例中，第一信息包括第二时长，第二时长为第二定时器的时长。
一种可能的设计中，第二定时器的启动条件包括：UE满足LTM的相关进入条件和CHO的执行条件。
本方案中，UE配置了CHO和LTM。UE在满足CHO的执行条件和LTM的相关进入条件，不立即开始执行CHO，而是先启动第二定时器，在等待一段时间后再选择执行CHO或LTM。
例如，UE可以在满足LTM的相关进入条件时，启动第二定时器，第二定时器的时长为LTM的触发事件的TTT。在LTM的TTT内，UE衡量是否满足CHO的执行条件，在满足CHO的执行条件时启动第二定时器。第二定时器的第二时长可以小于LTM的TTT。
UE在LTM的TTT内，在满足CHO的执行条件时启动第二定时器开始等待，UE的实际等待时长可能等于第二时长，也可能不等于第二时长。UE根据第二定时器的结束条件是否满足，确定是否结束等待。
在一种示例中，第二定时器的结束条件包括：在第二定时器运行期间，如果满足LTM的相关离开条件和CHO的执行条件，则执行CHO。
UE配置第二定时器T_w，T_w的时长可以小于LTM的执行条件内的TTT。如果UE满足了LTM的相关进入条件，后L3测量结果满足CHO的执行条件，则启动T_w。若在T_w时间内满足LTM的相关离开条件且L3测量结果仍满足CHO的执行条件，则执行CHO。若L3测量结果在T_w里一直满足CHO的执行条件，则在T_w超时后执行CHO。
如图8所示，UE在t0满足LTM的相关进入条件，启动定时器，定时器的时长为LTM的TTT。UE在LTM的TTT运行期间，衡量是否满足CHO的执行条件。如果UE在t1满足CHO的执行条件，UE启动第二定时器，第二定时器的时长T20，T20小于LTM的TTT，第二定时器的结束时刻t3早于LTM的TTT的结束时刻t4。
在第二定时器运行期间，UE衡量候选小区是否满足LTM的相关离开条件，如果在第二定时器超时前，UE在t2衡量满足LTM的相关离开条件，且UE还持续满足CHO的执行条件，UE则停止等待，开始执行CHO。这种情况下，UE的实际等待时长T21，T21小于T20。
在第二定时器运行期间，UE衡量候选小区不满足LTM的相关离开条件。在第二定时器超时即t3，UE仍不满足LTM的相关离开条件，且UE持续满足CHO的执行条件，UE则在第二定时器超时后执行CHO。这种情况下，UE的实际等待时长T22，T22等于T20。
在其他实施方式中，还可能存在LTM的TTT的结束时刻早于第二定时器的超时时刻的情况。这种情况下，UE可以在LTM的TTT超时的时候，就开始执行CHO。当然，UE也可以等待第二定时器超时的时候，再开始执行CHO。
本示例提供的通信方法，UE在满足LTM的相关进入条件后的TTT运行期间，在衡量满足CHO的执行条件后启动第二定时器，在第二定时器运行期间衡量是否满足LTM的相关离开条件，并在满足LTM的相关离开条件时或在第二定时器超时的时候开始执行CHO。
在另一种示例中，第二定时器的结束条件包括：在第二定时器运行期间，如果满足CHO的执行条件，在第二定时器超时后执行CHO。
如图9所示，UE在LTM的TTT运行期间，衡量是否满足CHO的执行条件。如果UE在t1满足CHO的执行条件，EU启动第二定时器，第二定时器的时长T20小于LTM的TTT，第二定时器的结束时刻t2早于LTM的TTT的结束时刻t3。
在第二定时器运行期间，UE衡量候选小区是否满足CHO的执行条件。如果在第二定时器运行期间，UE衡量候选小区持续满足CHO的执行条件，则在第二定时器超时后即t2执行CHO。这种情况下，UE的实际等待时长T22等于T20。
在其他实施方式中，还可能存在LTM的TTT早于第二定时器的超时时刻的情况。这种情况下，UE可以在LTM的TTT超时的时候，就开始执行CHO。当然，UE也可以等待第二定时器超时的时候，再开始执行CHO。
本示例提供的通信方法，UE在满足LTM相关进入条件后的TTT运行期间，在衡量满足CHO的执行条件后启动第二定时器，在第二定时器运行期间衡量是否持续满足CHO的执行条件，并在持续满足CHO的执行条件的情况下，在第二定时器超时的时候开始执行CHO。
实施例2，第一信息用于指示或包括小区切换命令，小区切换命令用于指示终端执行LTM或CHO。
本实施例中，UE可以基于衡量候选小区满足进入条件的情况，以及网络设备发送的小区切换命令，选择LTM或CHO。小区切换命令可以包括MAC CE，MAC CE可以指示UE执行LTM或指示UE执行CHO。
在具体实施时，UE可以基于自身的测量结果确定的切换方式以及MAC CE指示的切换方式选择执行LTM或CHO。如果基于自身的测量结果确定的切换方式与MAC CE指示的切换方式相同，则选择该切换方式。反之，如果不同，则不直接按照MAC CE指示的切换方式，而是反馈指示UE当前满足的切换方式的信息，以便网络设备进一步指示切换方式。
比如UE可以基于自身的测量结果衡量是否满足CHO的相关进入条件或LTM的相关进入条件，开始衡量对应的执行条件。UE在满足CHO的相关进入条件自行决定开始衡量是否满足CHO的执行条件，在满足CHO的执行条件时执行CHO。或，UE也可以在满足LTM的相关进入条件时自行决定开始衡量LTM。
如果UE接收到网络设备发送的MAC CE指示UE执行LTM，但UE当前满足CHO的相关进入条件，具备执行CHO的能力。或，UE接收网络设备发送的MAC CE，MAC CE指示UE执行CHO，但UE当前满足LTM的执行条件，具备执行LTM的能力。也即是说，网络设备指示的切换类型和UE当前满足进入条件的切换类型不同，UE可以上报第二信息，以通知网络设备UE当前满足的切换类型。
基于上述方式，即使在MAC CE指示LTM的情况下，如果UE当前满足的切换方式不是LTM，也不会优选执行LTM，而是优选其他方式，比如CHO，反之，即使在MAC CE指示CHO的情况下，如果UE当前满足的切换方式不是CHO，也不会优先执行CHO。
下面将分别针对UE优先执行CHO和UE优先执行LTM这两种情况进行介绍。
第一方面，UE优先执行CHO。
在一种示例中，UE在接收MAC CE时，如果满足CHO的相关进入条件或CHO的执行条件，上报第二信息。第二信息用于指示或包括终端满足CHO的相关进入条件或CHO的执行条件。
UE在接收到网络设备发送的MAC CE指示UE执行LTM。此时UE如果已经满足CHO的相关进入条件或CHO的执行条件，UE即可先向网络设备上报第二信息，以等待网络设备的进一步指示再选择执行LTM或CHO，而不是直接基于MAC CE开始执行LTM。UE在接收MAC CE时，如果不满足CHO的相关进入条件或CHO的执行条件，执行LTM。
在具体实施时，如图10所示，UE在t0满足CHO的相关进入条件，开启CHO的TTT。在CHO的TTT运行期间，如果UE接收到网络设备指示执行LTM的MAC CE，UE即可向网络设备上报第二信息。
在其他实施方式中，如果UE在CHO的TTT超时后再接收到网络设备指示执行LTM的MAC CE，网络设备可以上报第二设备，直接执行LTM。
UE在接收到网络设备指示执行LTM的MAC CE，且衡量满足CHO的相关进入条件或CHO的执行条件，向网络设备上报第二设备。之后，UE即可根据通信协议的相关规定，执行LTM或CHO。
在一种具体实施方式中，UE可以在上报第二信息时启动第三定时器，在第三定时器超时后执行LTM。
继续如图10所示，UE在t1接收到指示执行LTM的MAC CE，启动第三定时器。第三定时器的时长T30，第三定时器的超时时刻t2可以早于CHO的TTT的结束时刻。UE在第三定时器运行期间衡量是否持续满足LTM的执行条件，如果持续满足LTM的执行条件，UE即可在第二定时器超时即t2开始执行LTM。这种情况下，UE实际等待时长T31等于第三时长T30，UE等待T31后才开始执行LTM，以达到了优先触发HCO的效果。
本实施方式提供的方案UE在接收到指示执行LTM的MAC CE，启动第三定时器。若UE当前已满足CHO的相关进入条件，UE在接收到指示执行LTM的MAC CE等待第三时长后，才开始执行LTM。
在另一种具体实施方式中，UE在上报第二信息后，还可以接收网络设备发送的指示执行LTM或CHO的MAC CE。
例如，UE若接收到第一指示，第一指示用于指示执行CHO。UE在接收到第一指示时，可以开始衡量是否满足CHO的执行条件，在满足CHO的相关执行条件，开始执行CHO。
再例如，UE若接收到第二指示，第二指示用于指示执行LTM。UE在接收到第二指示时，可以开始衡量是否满足LTM的执行条件，在满足LTM的相关执行条件，开始执行LTM。
进一步的，UE还可以限定在CHO的TTT内或在第三定时器运行期间接收到第一指示或第二指示，才执行对应的切换方案。
如图11所示，在CHO的TTT内，UE在t1启动第三定时器。在第三定时器运行期间，如果UE在t4接收到第一指示，则直接开始执行CHO。如果UE在t5接收到第二指示，则直接开始执行LTM。如果UE在第三定时器运行期间未接收到第一指示和第二指示，则在t2时开始执行LTM。需要说明的，UE接收到第一指示、接收到第二指示、未接收到第一指示和第二指示为并列方案，UE会择一执行。UE不会接收到第一指示和第二指示，或，UE仅会基于在先接收的指示执行对应的切换方案。
本实施方式提供的通信方法，UE在满足CHO的相关进入条件的TTT内，如果接收到指示执行LTM的MAC CE，会先启动第三定时器，等待网络设备的进一步指示。网络设备可以下发下一步的第一指示，UE基于第一指示执行CHO。或，网络设备也可以下发第二指示，UE基于第二指示执行LTM。或，UE也可以在第三定时器超时后再开始执行LTM，以通过延迟触发LTM达到优先CHO的效果。
第二方面，UE优先执行LTM。
在一种示例中，UE在接收MAC CE时，如果满足LTM的相关进入条件或LTM的执行条件，上报第二信息。第二信息用于指示或包括终端满足LTM的相关进入条件或LTM的执行条件。
UE在接收到网络设备发送的MAC CE指示UE执行CHO。此时UE如果已经满足LTM的相关进入条件或LTM的执行条件，UE即可先向网络设备上报第二信息，以等待网络设备的进一步指示再选择执行CHO或LTM，而不是直接基于MAC CE开始执行CHO。
UE在接收MAC CE时，如果不满足LTM的相关进入条件或LTM的执行条件，执行CHO。
在具体实施时，UE在满足LTM的相关进入条件，开启LTM的TTT。在LTM的TTT运行期间，如果UE接收到网络设备指示执行CHO的MAC CE，UE即可向网络设备上报第二信息。
在其他实施方式中，如果UE在LTM的TTT超时后再接收到网络设备指示执行CHO的MAC CE，网络设备可以上报第二设备，直接执行CHO。
UE在接收到网络设备指示执行CHO的MAC CE，且衡量满足LTM的相关进入条件或LTM的执行条件，向网络设备上报第二设备。之后，UE即可根据通信协议的相关规定，执行CHO或LTM。
在一种具体实施方式中，UE可以在上报第二信息时启动第三定时器，在第三定时器超时后执行CHO。
UE在接收到指示执行CHO的MAC CE，启动第三定时器。第三定时器的时长，第三定时器的超时时刻可以早于LTM的TTT的结束时刻。UE在第三定时器运行期间衡量是否持续满足CHO的执行条件，如果持续满足CHO的执行条件，UE即可在第二定时器超时开始执行CHO。这种情况下，UE实际等待时长等于第三时长，UE等待后才开始执行CHO，以达到了优先触发HCO的效果。
本实施方式提供的方案UE在接收到指示执行CHO的MAC CE，启动第三定时器。若UE当前已满足LTM的相关进入条件，UE在接收到指示执行CHO的MAC CE等待第三时长后，才开始执行CHO。
在另一种具体实施方式中，UE在上报第二信息后，还可以接收网络设备发送的指示执行CHO或LTM的MAC CE。
例如，UE若接收到第一指示，第一指示用于指示执行LTM。UE在接收到第一指示时，可以开始衡量是否满足LTM的执行条件，在满足LTM的相关执行条件，开始执行LTM。
再例如，UE若接收到第二指示，第二指示用于指示执行CHO。UE在接收到第二指示时，可以开始衡量是否满足CHO的执行条件，在满足CHO的相关执行条件，开始执行CHO。
进一步的，UE还可以限定在LTM的TTT内或在第三定时器运行期间接收到第一指示或第二指示，才执行对应的切换方案。
在LTM的TTT内，UE启动第三定时器。在第三定时器运行期间，如果UE接收到第一指示，则直接开始执行LTM。如果UE接收到第二指示，则直接开始执行CHO。如果UE在第三定时器运行期间未接收到第一指示和第二指示，则开始执行CHO。需要说明的，UE接收到第一指示、接收到第二指示、未接收到第一指示和第二指示为并列方案，UE会择一执行。UE不会接收到第一指示和第二指示，或，UE仅会基于在先接收的指示执行对应的切换方案。
本实施方式提供的通信方法，UE在满足LTM的相关进入条件的TTT内，如果接收到指示执行CHO的MAC CE，会先启动第三定时器，等待网络设备的进一步指示。网络设备可以下发下一步的第一指示，UE基于第一指示执行LTM。或，网络设备也可以下发第二指示，UE基于第二指示执行CHO。或，UE也可以在第三定时器超时后再开始执行CHO，以通过延迟触发CHO达到优先LTM的效果。
实施例3，UE在衡量L3测量结果满足CHO的相关进入条件后，停止衡量L1测量结果或L3测量结果相关的触发事件。
本实施例中，UE可以基于第一信息或通信协议的规定，在衡量L3测量结果满足CHO的相关进入条件后，停止衡量L1测量结果或L3测量结果相关的触发事件。以及，UE还可以在衡量L3测量结果满足CHO的相关进入条件时，衡量是否满足CHO的执行条件，在满足CHO的执行条件时执行CHO。
或，网络设备还可以提供优先执行LTM的对应方案。
具体的，UE在衡量L1测量结果满足LTM的相关进入条件后，停止衡量L3测量结果或L1测量结果相关的触发事件。
本实施例中，UE可以基于第一信息或通信协议的规定，在衡量L1测量结果满足LTM的相关进入条件后，停止衡量L3测量结果或L1测量结果相关的触发事件。以及，UE还可以在衡量L1测量结果满足LTM的相关进入条件时，衡量是否满足LTM的执行条件，在满足LTM的执行条件时执行LTM。
本实施例提供的通信方法，UE在衡量L3测量结果满足CHO的相关进入条件后，停止衡量L1测量结果，以达到不执行LTM的技术效果。或，UE在衡量L1测量结果满足LTM的相关进入条件后，停止衡量L3测量结果，以达到不执行CHO的技术效果。通过直接取消UE衡量另一种切换，有效解决切换方案共存导致的冲突问题。
实施例4，第一信息包括或用于指示LTM的优先级和/或CHO的优先级。或可以理解为第一信息用于指示或包括优先级，该优先级可以用于配置LTM和/或CHO的偏置值。
可选的，第一信息可以直接包括LTM对应的优先级字段(Priority)，或，第一信息也可以通过其他指代方式指示LTM的优先级。对应的，第一信息可以直接包括CHO对应的优先级字段，或，第一信息也可以通过其他指代方式指示CHO的优先级。
UE基于优先级执行LTM或CHO的方案中，第一信息还可以包括或用于指示的LTM的优先级和CHO的优先级不同，以避免UE同时执行LTM和CHO导致切换冲突的情况。需要说明的是，第一信息可以直接限定CHO和LTM的优先级不同，或，第一信息可以不直接限定CHO和LTM的优先级不同，而是分别为CHO和LTM指示不同的优先级。
UE基于LTM的优先级和CHO的优先级，执行LTM或CHO。具体的，UE执行较高的优先级对应的切换方案。在具体实施时，第一信息可以指示LTM的优先级和CHO的优先级，且第一信息还可以指示UE执行较高的优先级对应的切换方案。或，第一信息可以指示LTM的优先级和CHO的优先级，UE可以基于通信协议或预配置规则，执行较高的优先级对应的切换方案。
在此基础上，第一信息包括或用于指示的优先级，还可以根据网络设备、协议或用户期待UE优先执行的切换方案，提供不同的优先级配置方案，下面将分别针对UE优先执行CHO和UE优先执行LTM这两种情况进行介绍。
第一方面，UE优先执行CHO。
UE优先执行CHO，第一信息可以为CHO和LTM均配置优先级，且为CHO配置的优先级高于LTM的优先级。
例如，第一信息指示为CHO配置高优先级，为LTM配置低优先级。第一信息指示UE执行高优先级的切换方案，或指示UE执行CHO。
再例如，第一信息指示为CHO配置第一优先级，为LTM配置第二优先级，第一优先级高于第二优先级。第一信息指示UE执行第一优先级的切换方案，或指示UE执行CHO。
在其他情况下，UE优先执行CHO，第一信息也可以仅为CHO配置优先级，不为LTM配置优先级。CHO存在优先级，LTM不存在优先级。第一信息也可以指示UE执行存在优先级的切换方案，或指示UE执行CHO。
在CHO的优先级高于LTM的基础上，还可以通过第一指示信息或通信协议，指示UE优先执行CHO需要满足的条件。
通常的，UE执行CHO，至少需要满足CHO的执行条件(Execution Conditions)。CHO的执行条件是指UE已经进入CHO流程后，实际触发切换动作的具体条件。这些条件通常是基于UE测量结果和网络配置的切换条件。当UE的测量结果满足这些触发条件时，UE将自行决定执行切换，而不需要等待网络设备的切换命令。
UE衡量是否满足CHO的执行条件之前，还需要衡量是否满足CHO的相关进入条件(Entry condition)。CHO的相关进入条件通常指的是启动CHO流程的初始条件，包括UE是否已经接收到了CHO配置信息、是否已经处于RRC连接状态、以及是否已经收到了网络设备下发的测量控制信息等。只有当这些进入条件满足时，UE才可以开始执行CHO。
UE开始执行CHO之前，可能还需要衡量是否满足LTM的执行条件或LTM的相关进入条件。
下面将分几种情况，解释UE优先执行CHO需要满足的条件。
第一种情况，UE在CHO的执行条件和LTM的执行条件均满足的情况下，执行CHO。
UE衡量满足CHO的执行条件，且满足LTM的执行条件。这种情况下，UE优先执行CHO，以减少网络等待延时，提高切换效率。
第二种情况，UE在衡量LTM的执行条件满足的情况，继续衡量CHO的执行条件是否满足。如果UE满足CHO的执行条件，则执行CHO，停止衡量LTM的执行条件。
UE衡量满足LTM的执行条件，不直接执行LTM，UE继续衡量CHO的执行条件是否满足。UE衡量CHO的执行条件满足时，就执行CHO。UE开始执行CHO后，就无需继续衡量LTM的执行条件是否满足，UE停止衡量LTM的执行条件。
第三种情况，UE在CHO的执行条件满足的情况下，执行CHO，停止衡量LTM的执行条件。
UE在衡量CHO的执行条件满足时，可以直接开始执行CHO。UE开始执行CHO后，就无需继续衡量LTM的执行条件是否满足，UE停止衡量LTM的执行条件。UE在执行CHO之前，可以衡量CHO的执行条件和LTM的执行条件，一旦CHO的执行条件满足即可开始执行CHO。
上述几种情况下UE执行的通信方法，UE在满足CHO的执行条件的情况下，或UE在满足LTM的执行条件和CHO的执行条件的情况下，优先执行CHO。
第二方面，UE优先执行LTM。
UE优先执行LTM，第一信息可以为CHO和LTM均配置优先级，且为CHO配置的优先级低于LTM的优先级，或说为LTM配置的优先级高于CHO的优先级。
例如，第一信息指示为LTM配置高优先级，为CHO配置低优先级。第一信息指示UE执行高优先级的切换方案，或指示UE执行LTM。
再例如，第一信息指示为LTM配置第一优先级，为CHO配置第二优先级，第一优先级高于第二优先级。第一信息指示UE执行第一优先级的切换方案，或指示UE执行LTM。
在其他情况下，UE优先执行LTM，第一信息也可以仅为LTM配置优先级，不为CHO配置优先级。LTM存在优先级，CHO不存在优先级。第一信息也可以指示UE执行存在优先级的切换方案，或指示UE执行LTM。
在LTM的优先级高于CHO的基础上，还可以通过第一指示信息或通信协议，指示UE优先执行LTM需要满足的条件。
通常的，UE执行LTM，至少需要满足LTM的执行条件(Execution Conditions)。
下面将分几种情况，解释UE优先执行LTM需要满足的条件。
第一种情况，UE在LTM的执行条件和CHO的执行条件均满足的情况下，执行LTM。
UE衡量满足LTM的执行条件，且满足CHO的执行条件。这种情况下，UE优先执行LTM，以减少网络等待延时，提高切换效率。
第二种情况，UE在衡量CHO的执行条件满足的情况，继续衡量LTM的执行条件是否满足。如果UE满足LTM的执行条件，则执行LTM，停止衡量CHO的执行条件。
UE衡量满足CHO的执行条件，不直接执行CHO，UE继续衡量LTM的执行条件是否满足。UE衡量LTM的执行条件满足时，就执行LTM。UE开始执行LTM后，就无需继续衡量CHO的执行条件是否满足，UE停止衡量CHO的执行条件。
第三种情况，UE在LTM的执行条件满足的情况下，执行LTM，停止衡量CHO的执行条件。
UE在衡量LTM的执行条件满足时，可以直接开始执行LTM。UE开始执行LTM后，就无需继续衡量CHO的执行条件是否满足，UE停止衡量CHO的执行条件。UE在执行LTM之前，可以衡量LTM的执行条件和CHO的执行条件，一旦LTM的执行条件满足即可开始执行LTM。
上述几种情况下UE执行的通信方法，UE在满足LTM的执行条件的情况下，或UE在满足CHO的执行条件和LTM的执行条件的情况下，优先执行LTM。
上述本实施例提供的几种方案，UE基于第一信息指示或包括的优先级，确定执行LTM或CHO。UE确定执行切换方案的规则相对简单，UE计算量较少，切换效率较高。
实施例5，第一信息包括或用于指示LTM关联的偏置值和/或CHO关联的偏置值。或可以理解为第一信息用于指示或包括偏置值，偏置值可以用于配置为LTM关联的偏置值和/或CHO关联的偏置值。
其中，LTM关联的偏置值用于终端衡量是否满足LTM的执行条件。CHO关联的偏置值用于终端衡量是否满足CHO的执行条件。UE在基于偏置值衡量是否满足对应的执行条件后，可以根据这两类切换方案的执行条件的满足情况，选择优先满足的切换方案。或UE也可以结合着两类切换的执行条件的满足情况，以及前述实施例1-4所提供的方案，综合决定UE执行LTM或CHO。
在具体实施时，UE根据CHO的偏置值衡量候选小区是否满足CHO的执行条件，以及，UE根据LTM的偏置值衡量候选小区是否满足LTM的执行条件，适用于候选小区关联LTM的执行条件和CHO的执行条件的情况。
具体的，第一信息可以直接包括LTM对应的偏置值(offset value)字段，或，第一信息也可以通过其他指代方式指示LTM的偏置值。对应的，第一信息可以直接包括CHO对应的偏置值字段，或，第一信息也可以通过其他指代方式指示CHO的偏置值。
在一种具体实施方式中，第一信息包括或用于指示LTM的偏置值，可以为LTM的触发事件的偏置值。UE复用LTM的触发事件的偏置值，衡量LTM候选小区是否满足LTM的执行条件。或，第一信息包括或用于指示CHO的偏置值，可以为CHO的触发事件的偏置值。UE直接复用CHO的触发事件的偏置值，衡量CHO候选小区是否满足CHO的执行条件。
在另一种具体方式中，第一信息包括或用于指示LTM的偏置值，可以是网络设备单独配置的偏置值，即第一信息为LTM和CHO分别配置了偏置值。UE可以基于通信协议的相关规定，基于配置的偏置值衡量是否满足LTM的执行条件和CHO的执行条件。
在一种示例中，LTM对应的测量结果为15，偏置值为1，预配置条件为20。CHO对应的测量结果为8，偏置值为2，预配置条件为15。基于第一信息，UE可以LTM对应的偏置值1衡量是否满足LTM的执行条件，以及基于CHO对应的偏置值2衡量是否满足CHO的执行条件。
在其他实施方式中，第一信息可以分别为LTM和CHO配置偏置值。UE可以基于通信协议的相关规定，基于触发事件的偏置值和配置的偏置值衡量是否满足LTM的执行条件和CHO的执行条件。例如，UE将LTM的配置偏置值和LTM的触发事件的偏置值的和或乘积，作为LTM关联的偏置值，来衡量LTM候选小区是否满足LTM的执行条件。以及，UE将CHO的配置偏置值和CHO的触发事件的偏置值的和或乘积，作为CHO关联的偏置值，来衡量CHO候选小区是否满足CHO的执行条件。UE可以根据综合确定的LTM关联的偏置值和CHO关联的偏置值，执行LTM或CHO。
UE基于偏置值执行LTM或CHO的方案中，第一信息还可以包括或用于指示LTM的偏置值和CHO的偏置值不同，以避免UE通知执行LTM和CHO导致切换冲突的情况。需要说明的是，第一信息可以直接限定CHO的偏置值和LTM的偏置值不同，或，第一信息也可以不直接限定CHO的偏置值和LTM的偏置值不同，而是分别为CHO和LTM配置不同的偏置值。
上述本实施例提供的几种方案，UE基于第一信息指示或包括的偏置值，衡量对应切换方案的执行条件的满足情况，以使得UE可以根据执行条件的满足情况选择执行LTM或CHO。UE确定执行切换方案的规则相对简单，UE计算量较少，切换效率较高。
可以理解的是，以上各个实施例中，由UE实现的方法和/或步骤，也可以由可用于UE的部件(例如处理器、芯片、芯片系统、电路、逻辑模块、或软件)实现。其中，芯片系统可以由芯片构成，或，芯片系统可以包括芯片和其他分立器件。
可以理解的是，该UE为了实现上述功能，其包含了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
通信装置图12示出了一种通信装置1200的结构示意图。该通信装置1200包括处理模块1201和收发模块1202。该通信装置1200可以用于实现上述UE或网络设备gNB的功能。
在一些实施例中，该通信装置1200还可以包括存储模块(图12中未示出)，用于存储程序指令和数据。
在一些实施例中，收发模块1202，也可以称为收发单元用以实现发送和/或接收功能。该收发模块1202可以由收发电路、收发机、收发器或通信接口构成。
在一些实施例中，收发模块1202，可以包括接收模块和发送模块，分别用于执行上述方法实施例中由UE或gNB执行的接收和发送类的步骤，和/或用于支持本文所描述的技术的其它过程；处理模块1201，可以用于执行上述方法实施例中由UE或gNB执行的处理类(例如确定等)的步骤，和/或用于支持本文所描述的技术的其它过程。
在该通信装置1200用于实现UE的功能时：
收发模块1202，用于获取第一信息；第一信息用于指示UE执行层1层2触发的移动性管理LTM或条件切换CHO。
处理模块1201，用于根据第一信息，执行LTM或CHO。
在该通信装置1200用于实现网络设备gNB的功能时：
收发模块1202，用于发送第一信息；第一信息用于指示终端执行层1层2触发的移动性管理LTM或条件切换CHO。
其中，上述方法实施例涉及的各步骤的所有相关内容均可以援引到对应功能模块的功能描述，在此不再赘述。
在本申请中，该通信装置1200可以采用集成的方式划分各个功能模块的形式来呈现。这里的“模块”可以指特定专用集成电路(Application-Specific Integrated Circuit，ASIC)，电路，执行一个或多个软件或固件程序的处理器和存储器，集成逻辑电路，和/或其他可以提供上述功能的器件。
在一些实施例中，当图12中的通信装置1200是芯片或芯片系统时，收发模块1202的功能/实现过程可以通过芯片或芯片系统的输入输出接口(或通信接口)实现，处理模块1201的功能/实现过程可以通过芯片或芯片系统的处理器(或处理电路)实现。
由于本实施例提供的通信装置1200可执行上述方法，因此其所能获得的技术效果可参考上述方法实施例，在此不再赘述。
作为一种可能的产品形态，本申请实施例的UE或gNB，还可以使用下述来实现：一个或多个现场可编程门阵列(Field Programmable Gate Array，FPGA)、可编程逻辑器件(Programmable Logic Device，PLD)、控制器、状态机、门逻辑、分立硬件部件、任何其它适合的电路、或能够执行本申请通篇所描述的各种功能的电路的任意组合。
作为另一种可能的产品形态，本申请实施例的UE或gNB，可以由一般性的总线体系结构来实现。为了便于说明，参见图13，图13是本申请实施例提供的通信装置1300的结构示意图，该通信装置1300包括处理器1301和收发器1302。该通信装置1300可以为gNB，或其中的芯片或芯片系统；或，该通信装置1300可以为UE，或其中的芯片或模块。图13仅示出了通信装置1300的主要部件。除处理器1301和收发器1302之外，通信装置还可以进一步包括存储器1303、以及输入输出装置(图未示意)。
可选的，处理器1301主要用于对通信协议以及通信数据进行处理，以及对整个通信装置进行控制，执行软件程序，处理软件程序的数据。存储器1303主要用于存储软件程序和数据。收发器1302可以包括射频电路和天线，射频电路主要用于基带信号与射频信号的转换以及对射频信号的处理。天线主要用于收发电磁波形式的射频信号。输入输出装置，例如触摸屏、显示屏，键盘等主要用于接收用户输入的数据以及对用户输出数据。
可选的，处理器1301、收发器1302、以及存储器1303可以通过通信总线连接。
当通信装置开机后，处理器1301可以读取存储器1303中的软件程序，解释并执行软件程序的指令，处理软件程序的数据。当需要通过无线发送数据时，处理器1301对待发送的数据进行基带处理后，输出基带信号至射频电路，射频电路将基带信号进行射频处理后将射频信号通过天线以电磁波的形式向外发送。当有数据发送到通信装置时，射频电路通过天线接收到射频信号，将射频信号转换为基带信号，并将基带信号输出至处理器1301，处理器1301将基带信号转换为数据并对该数据进行处理。
在另一种实现中，射频电路和天线可以独立于进行基带处理的处理器而设置，例如在分布式场景中，射频电路和天线可以与独立于通信装置，呈拉远式的布置。
在一些实施例中，在硬件实现上，本领域的技术人员可以想到上述通信装置1200可以采用图13所示的通信装置1300的形式。
作为一种示例，图12中的处理模块1201的功能/实现过程可以通过图13所示的通信装置1300中的处理器1301调用存储器1303中存储的计算机执行指令来实现。图12中的收发模块1202的功能/实现过程可以通过图13所示的通信装置1300中的收发器1302来实现。
作为又一种可能的产品形态，本申请中的UE或gNB可以采用图14所示的组成结构，或包括图14所示的部件。图14为本申请提供的一种通信装置1400的组成示意图，该通信装置1400可以为终端设备或终端设备中的芯片或片上系统；或，可以为UE或gNB中的模块或芯片或片上系统。
如图14所示，该通信装置1400包括至少一个处理器1401，以及至少一个通信接口(图14中仅是示例性的以包括一个通信接口1404，以及一个处理器1401为例进行说明)。可选的，该通信装置1400还可以包括通信总线1402和存储器1403。
处理器1401可以是一个通用中央处理器(Central Processing Unit，CPU)、通用处理器、网络处理器(Network Processor，NP)、数字信号处理器(Digital Signal Processing，DSP)、微处理器、微控制器、可编程逻辑器件(Programmable Logic Device，PLD)或它们的任意组合。处理器1401还可以是其它具有处理功能的装置，例如电路、器件或软件模块，不予限制。
通信总线1402用于连接通信装置1400中的不同组件，使得不同组件可以通信。通信总线1402可以是外设部件互连标准(Peripheral Component Interconnect，PCI)总线或扩展工业标准结构(Extended Industry Standard Architecture，EISA)总线等。该总线可以分为地址总线、数据总线、控制总线等。为便于表示，图14中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。
通信接口1404，用于与其他设备或通信网络通信。示例性的，通信接口1404可以模块、电路、收发器或任何能够实现通信的装置。可选的，通信接口1404也可以是位于处理器1401内的输入输出接口，用以实现处理器的信号输入和信号输出。
存储器1403，可以是具有存储功能的装置，用于存储指令和/或数据。其中，指令可以是计算机程序。
示例性的，存储器1403可以是只读存储器(Read-Only Memory，ROM)或可存储静态信息和/或指令的其他类型的静态存储设备，也可以是随机存取存储器(Random Access Memory，RAM)或可存储信息和/或指令的其他类型的动态存储设备，还可以是电可擦可编程只读存储器(Electrically Erasable Programmable Read-Only Memory，EEPROM)、只读光盘(Compact Disc Read-Only Memory，CD-ROM)或其他光盘存储、光碟存储(包括压缩光碟、激光碟、光碟、数字通用光碟、蓝光光碟等)、磁盘存储介质或其他磁存储设备等，不予限制。
需要指出的是，存储器1403可以独立于处理器1401存在，也可以和处理器1401集成在一起。存储器1403可以位于通信装置1400内，也可以位于通信装置1400外，不予限制。处理器1401，可以用于执行存储器1403中存储的指令，以实现本申请下述实施例提供的方法。
作为一种可选的实现方式，通信装置1400还可以包括输出设备1405和输入设备1406。输出设备1405和处理器1401通信，可以以多种方式来显示信息。例如，输出设备1405可以是液晶显示器(Liquid Crystal Display，LCD)，发光二极管(Light Emitting Diode，LED)显示设备，阴极射线管(Cathode Ray Tube，CRT)显示设备，或投影仪(Projector)等。输入设备1406和处理器1401通信，可以以多种方式接收用户的输入。例如，输入设备1406可以是鼠标、键盘、触摸屏设备或传感设备等。
在一些实施例中，在硬件实现上，本领域的技术人员可以想到上述图12所示的通信装置1200可以采用图14所示的通信装置1400的形式。
作为一种示例，图12中的处理模块1201的功能/实现过程可以通过图14所示的通信装置1400中的处理器1401调用存储器1403中存储的计算机执行指令来实现。图12中的收发模块1202的功能/实现过程可以通过图14所示的通信装置1400中的通信接口1404来实现。
需要说明的是，图14所示的结构并不构成对UE或gNB的具体限定。比如，在本申请另一些实施例中，UE或gNB可以包括比图示更多或更少的部件，或组合某些部件，或拆分某些部件，或不同的部件布置。图示的部件可以以硬件，软件或软件和硬件的组合实现。
在一些实施例中，本申请实施例还提供一种通信装置，该通信装置包括处理器，用于实现上述任一方法实施例中的方法。
作为一种可能的实现方式，该通信装置还包括存储器。该存储器，用于保存必要的计算机程序和数据。该计算机程序可以包括指令，处理器可以调用存储器中存储的计算机程序中的指令以指令该通信装置执行上述任一方法实施例中的方法。当然，存储器也可以不在该通信装置中。
作为另一种可能的实现方式，该通信装置还包括接口电路，该接口电路为代码/数据读写接口电路，该接口电路用于接收计算机执行指令(计算机执行指令存储在存储器中，可能直接从存储器读取，或可能经过其他器件)并传输至该处理器。
作为又一种可能的实现方式，该通信装置还包括通信接口，该通信接口用于与该通信装置之外的模块通信。
可以理解的是，该通信装置可以是芯片或芯片系统，该通信装置是芯片系统时，可以由芯片构成，也可以包含芯片和其他分立器件，本申请实施例对此不作具体限定。
本申请还提供了一种计算机可读存储介质，其上存储有计算机程序或指令，该计算机程序或指令被计算机执行时实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
在一些实施例中，通过以上的实施方式的描述，所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，仅以上述各功能模块的划分进行举例说明，实际应用中，可以根据需要而将上述功能分配由不同的功能模块完成，即将装置的内部结构划分成不同的功能模块，以完成以上描述的全部或部分功能。在本申请实施例各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或说对现有技术做出贡献的部分或该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或网络设备等)或处理器执行本申请各个实施例所述方法的全部或部分步骤。
以上所述，仅为本申请实施例的具体实施方式，但本申请实施例的保护范围并不局限于此，任何在本申请实施例揭露的技术范围内的变化或替换，都应涵盖在本申请实施例的保护范围之内。因此，本申请实施例的保护范围应以所述权利要求的保护范围为准。

Claims (52)

  1. 一种通信方法，其特征在于，应用于终端，所述通信方法包括：
    获取第一信息；所述第一信息用于指示所述终端执行层1/层2触发的移动性管理LTM或条件切换CHO；
    根据所述第一信息，执行所述LTM或所述CHO。
  2. 根据权利要求1所述的通信方法，其特征在于，所述第一信息用于指示或包括第一时长，所述第一时长为第一定时器的时长；
    所述第一定时器的启动条件包括：所述终端得到L1测量结果或满足所述LTM的执行条件。
  3. 根据权利要求1所述的通信方法，其特征在于，所述第一定时器的启动条件包括：满足所述LTM的执行条件的情况下，满足所述LTM的执行条件的LTM候选小区为CHO候选小区。
  4. 根据权利要求2或3所述的通信方法，其特征在于，所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    启动所述第一定时器；
    如果在所述第一定时器运行期间，满足所述CHO的执行条件，则执行所述CHO；或，
    如果所述第一定时器运行期间不满足所述CHO的执行条件，则执行所述LTM。
  5. 根据权利要求2-4中任一项所述的通信方法，其特征在于，所述第一时长等于所述LTM的触发事件的触发时长TTT。
  6. 根据权利要求1所述的通信方法，其特征在于，所述第一信息用于指示或包括第二时长，所述第二时长为第二定时器的时长；
    所述第二定时器的启动条件包括：满足所述CHO的相关进入条件和所述LTM的执行条件。
  7. 根据权利要求6所述的通信方法，其特征在于，所述第二定时器的启动条件还包括：
    在所述CHO的触发事件的触发时长TTT运行期间，满足所述LTM的执行条件。
  8. 根据权利要求6或7所述的通信方法，其特征在于，所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    启动所述第二定时器；
    在所述第二定时器运行期间，如果满足所述CHO的相关离开条件和所述LTM的执行条件，则执行所述LTM。
  9. 根据权利要求6或7所述的通信方法，其特征在于，所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    启动所述第二定时器；
    在所述第二定时器运行期间，如果满足所述LTM的执行条件，在所述第二定时器超时后执行所述LTM。
  10. 根据权利要求1所述的通信方法，其特征在于，所述第一信息用于指示或包括小区变更命令，所述小区变更命令用于指示所述终端执行所述LTM；
    所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    在接收所述小区变更命令时，如果满足所述CHO的相关进入条件或所述CHO的执行条件，上报第二信息；其中，所述第二信息用于指示或包括所述终端满足所述CHO的相关进入条件或所述CHO的执行条件；或，
    在接收所述小区变更命令时，如果不满足所述CHO的相关进入条件或所述CHO的执行条件，执行所述LTM。
  11. 根据权利要求10所述的通信方法，其特征在于，所述通信方法还包括：
    在上报第二信息时启动第三定时器；
    在所述第三定时器超时后执行所述LTM。
  12. 根据权利要求10所述的通信方法，其特征在于，所述通信方法还包括：
    接收到第一指示；其中，所述第一指示用于指示执行所述CHO；
    接收第二指示；其中，所述第二指示用于指示执行所述LTM。
  13. 根据权利要求1所述的通信方法，其特征在于，所述第一信息包括或用于指示所述LTM的优先级和/或所述CHO的优先级；
    所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    基于所述LTM的优先级和/或所述CHO的优先级，执行所述LTM或所述CHO。
  14. 根据权利要求13所述的通信方法，其特征在于，所述基于所述LTM的优先级和/或所述CHO的优先级，执行所述LTM或所述CHO，包括以下任一：
    如果所述CHO的优先级高于所述LTM的优先级，则在满足所述CHO的执行条件和所述LTM的执行条件的情况下，执行所述CHO；
    如果所述CHO的优先级高于所述LTM的优先级，则在满足所述LTM的执行条件的过程中，如果满足所述CHO的执行条件，则执行所述CHO，并停止衡量是否满足所述LTM的执行条件；
    如果所述CHO的优先级高于所述LTM的优先级，则在满足所述CHO的执行条件的情况下，执行所述CHO，并停止衡量是否满足所述LTM的执行条件。
  15. 根据权利要求13或14所述的通信方法，其特征在于，所述基于所述LTM的优先级和/或所述CHO的优先级，执行所述LTM或所述CHO，包括以下任一：
    如果所述CHO的优先级低于所述LTM的优先级，则在满足所述CHO的执行条件和所述LTM的执行条件的情况下，执行所述LTM；
    如果所述CHO的优先级低于所述LTM的优先级，则在满足所述CHO的执行条件的过程中，如果满足所述LTM的执行条件，则执行所述LTM，并停止衡量是否满足所述CHO的执行条件；
    如果所述CHO的优先级低于所述LTM的优先级，则在满足所述LTM的执行条件的情况下，执行所述LTM，并停止衡量是否满足所述CHO的执行条件。
  16. 根据权利要求1所述的通信方法，其特征在于，所述第一信息包括或用于指示所述LTM关联的偏置值和/或所述CHO关联的偏置值；
    所述LTM关联的偏置值用于所述终端衡量是否满足所述LTM的执行条件；
    所述CHO关联的偏置值用于所述终端衡量是否满足所述CHO的执行条件。
  17. 根据权利要求16所述的通信方法，其特征在于，所述终端衡量的候选小区关联所述LTM的执行条件和所述CHO的执行条件。
  18. 根据权利要求1所述的通信方法，其特征在于，所述第一信息用于指示或包括第一时长，第一时长为第一定时器的时长；
    所述第一定时器的启动条件包括：所述终端得到L3测量结果或满足所述CHO的执行条件。
  19. 根据权利要求1所述的通信方法，其特征在于，所述第一定时器的启动条件包括：L3测量结果满足所述CHO的执行条件的情况下，满足所述CHO的执行条件的CHO候选小区为LTM候选小区。
  20. 根据权利要求18或19所述的通信方法，其特征在于，所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    在满足所述CHO的执行条件的情况下，启动所述第一定时器；
    如果在所述第一定时器运行期间，满足所述LTM的执行条件，则执行所述LTM；或，
    如果所述第一定时器运行期间不满足所述LTM的执行条件，则执行所述CHO。
  21. 根据权利要求18-20中任一项所述的通信方法，其特征在于，所述第一时长等于所述CHO的触发事件的触发时长TTT。
  22. 根据权利要求17所述的通信方法，其特征在于，所述第一信息用于指示或包括第二时长，所述第二时长为第二定时器的时长；
    所述第二定时器的启动条件包括：所述终端满足所述LTM的相关进入条件和所述CHO的执行条件。
  23. 根据权利要求22所述的通信方法，其特征在于，所述第二定时器的启动条件还包括：
    所述LTM的触发事件的触发时长TTT运行期间，满足所述CHO的执行条件。
  24. 根据权利要求22或23所述的通信方法，其特征在于，所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    在所述第二定时器运行期间，如果满足所述LTM的相关离开条件和所述CHO的执行条件，则执行所述CHO。
  25. 根据权利要求22或23所述的通信方法，其特征在于，所述根据所述第一信息，执行所述LTM或所述CHO，包括：
    在所述第二定时器运行期间，如果满足所述CHO的执行条件，在所述第二定时器超时后执行所述CHO。
  26. 根据权利要求1所述的通信方法，其特征在于，所述第一信息用于指示或包括小区变更命令，所述小区变更命令用于指示所述终端执行所述CHO；
    所述根据所述第一信息，执行所述CHO或所述LTM，包括：
    在接收所述小区变更命令时，如果满足所述LTM的相关进入条件或所述LTM的执行条件，上报第二信息；其中，所述第二信息用于指示或包括所述终端满足所述LTM的相关进入条件或所述LTM的执行条件；或，
    在接收所述小区变更命令时，如果不满足所述LTM的相关进入条件或所述LTM的执行条件，执行所述CHO。
  27. 根据权利要求26所述的通信方法，其特征在于，所述通信方法还包括：
    在上报第二信息时启动第三定时器；
    在所述第三定时器超时后执行所述CHO。
  28. 根据权利要求26所述的通信方法，其特征在于，所述通信方法还包括：
    接收到第一指示；其中，所述第一指示用于指示执行所述LTM；
    接收第二指示；其中，所述第二指示用于指示执行所述CHO。
  29. 根据权利要求1所述的通信方法，其特征在于，所述第一信息还包括CHO配置和LTM配置：
    所述终端在衡量L3测量结果满足所述CHO的相关进入条件后，停止衡量L1测量结果或所述L3测量结果相关的触发事件。
  30. 根据权利要求1-29中任一项所述的通信方法，其特征在于，
    所述第一信息为预定义的；或，
    所述第一信息为网络设备配置给所述终端的。
  31. 根据权利要求1-30中任一项所述的通信方法，其特征在于，所述LTM为基于网络信令或基于事件触发的LTM小区变更。
  32. 一种通信方法，其特征在于，应用于网络设备，所述通信方法包括：
    向终端发送第一信息；所述第一信息用于指示终端执行层1/层2触发的移动性管理LTM或条件切换CHO。
  33. 根据权利要求32所述的通信方法，其特征在于，所述第一信息用于指示或包括第一时长，第一时长为第一定时器的时长；
    所述第一定时器的启动条件包括：所述终端得到L1测量结果或满足所述LTM的执行条件。
  34. 根据权利要求33所述的通信方法，其特征在于，所述第一时长等于所述LTM的触发事件的触发时长TTT。
  35. 根据权利要求32所述的通信方法，其特征在于，所述第一信息用于指示或包括第二时长，所述第二时长为第二定时器的时长；
    所述第二定时器的启动条件包括：所述终端满足所述CHO的相关进入条件和所述LTM的执行条件。
  36. 根据权利要求32所述的通信方法，其特征在于，所述第一信息用于指示或包括小区变更命令，所述小区变更命令用于指示所述终端执行所述LTM；
    所述向终端发送第一信息之后，所述通信方法还包括：
    接收所述终端上报的第二信息；其中，所述所述第二信息用于指示或包括所述终端满足所述CHO的相关进入条件或所述CHO的执行条件。
  37. 根据权利要求36所述的通信方法，其特征在于，所述通信方法还包括：
    向所述终端发送第一指示；其中，所述第一指示用于指示所述终端执行所述CHO；或，
    向所述终端发送第二指示；其中，所述第二指示用于指示所述终端执行所述LTM。
  38. 根据权利要求32所述的通信方法，其特征在于，所述第一信息包括或用于指示所述LTM的优先级和/或所述CHO的优先级；
    所述第一信息用于指示所述终端基于所述LTM的优先级和/或所述CHO的优先级，执行所述LTM或所述CHO。
  39. 根据权利要求32所述的通信方法，其特征在于，所述第一信息包括或用于指示所述LTM关联的偏置值和/或所述CHO关联的偏置值；
    所述LTM关联的偏置值用于所述终端衡量是否满足所述LTM的执行条件；
    所述CHO关联的偏置值用于所述终端衡量是否满足所述CHO的执行条件。
  40. 根据权利要求39所述的通信方法，其特征在于，所述通信方法还包括：
    为所述终端配置所述LTM和所述CHO；所述终端衡量的候选小区关联所述LTM的执行条件和所述CHO的执行条件。
  41. 根据权利要求32所述的通信方法，其特征在于，所述第一信息用于指示或包括第一时长，第一时长为第一定时器的时长；
    所述第一定时器的启动条件包括：所述终端得到L3测量结果或满足所述CHO的执行条件。
  42. 根据权利要求41所述的通信方法，其特征在于，所述第一时长等于所述CHO的触发事件的触发时长TTT。
  43. 根据权利要求32所述的通信方法，其特征在于，所述第一信息用于指示或包括第二时长，所述第二时长为第二定时器的时长；
    所述第二定时器的启动条件包括：所述终端满足所述LTM的相关进入条件和所述CHO的执行条件。
  44. 根据权利要求32所述的通信方法，其特征在于，所述第一信息用于指示或包括小区变更命令，所述小区变更命令用于指示所述终端执行所述CHO；
    所述向终端发送第一信息之后，所述通信方法还包括：
    接收所述终端上报的第二信息；其中，所述第二信息用于指示或包括所述终端满足所述LTM的相关进入条件或所述LTM的执行条件。
  45. 根据权利要求44所述的通信方法，其特征在于，所述通信方法还包括：
    向所述终端发送第一指示；其中，所述第一指示用于指示所述终端执行所述CHO；或，
    向所述终端发送第二指示；其中，所述第二指示用于指示所述终端执行所述LTM。
  46. 根据权利要求1-45中任一项所述的通信方法，其特征在于，所述第一信息还包括CHO配置和LTM配置。
  47. 根据权利要求1-46中任一项所述的通信方法，其特征在于，所述LTM为基于网络信令或基于事件触发的LTM小区变更。
  48. 一种通信方法，其特征在于，应用于通信系统，所述通信系统包括网络设备和终端，所述通信方法包括：
    所述网络设备向所述终端发送第一信息；所述第一信息用于指示所述终端执行层1/层2触发的移动性管理LTM或条件切换CHO；
    所述终端接收所述第一信息，根据所述第一信息执行所述LTM或所述CHO。
  49. 一种终端，其特征在于，所述终端包括收发器、存储器和处理器，所述收发器和所述存储器均与所述处理器耦合；
    所述收发器收发计算机指令；
    所述存储器存储计算机执行指令；
    所述处理器执行所述存储器存储的计算机执行指令，使得电子设备执行如权利要求1-31中任一项所述的通信方法。
  50. 一种网络设备，其特征在于，所述网络设备包括收发器、存储器和处理器，所述收发器和所述存储器均与所述处理器耦合；
    所述收发器收发计算机指令；
    所述存储器存储计算机执行指令；
    所述处理器执行所述存储器存储的计算机执行指令，使得电子设备执行如权利要求32-47中任一项所述的通信方法。
  51. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质中存储有计算机程序，当其在计算机上运行时，使得计算机执行如权利要求1至48中任一项所述的通信方法。
  52. 一种计算机程序产品，其特征在于，包括计算机程序，所述计算机程序被处理器执行时，实现如权利要求1至48中任一项所述的通信方法。
PCT/CN2025/092492 2024-06-12 2025-04-30 通信方法、终端、网络设备、计算机程序产品及存储介质 Pending WO2025256293A1 (zh)

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