Communication method and apparatus

Abstract

A communication method and apparatus. The method comprises: when a user equipment is in a first state, determining that a first condition is met, wherein the first state is a camped-normally state or a camped-on-any-cell state or an any-cell-selection state; and the user equipment entering a second state, in which the user equipment can detect a first synchronization signal and an alert signal, wherein the first synchronization signal is used by the user equipment to synchronize with a network device in the second state, and the alert signal is used for prompting the occurrence of service missing or service arrival. The embodiments of the present application provide a user equipment with a second state which can support an alert signal, such that the alert signal can be applied, thereby increasing the probability of the user equipment being successfully paged. Moreover, switching between the second state and a first state can also be achieved, such that the user equipment can enter different states under different conditions, so as to adapt to operating conditions of the user equipment.

Description

Communication method and apparatus

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese Patent Application No. 202411314115.8, filed on September 19, 2024, and entitled "A communication method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of communication technology, and in particular to a communication method and apparatus. BACKGROUND

[0004] In satellite communication technology, a user equipment (UE) can not receive a paging message from a network due to no satellite-to-satellite. For this reason, a technology for enhancing paging, called alert technology, is proposed. For example, the network can find the UE through an alert signal.

[0005] Currently, several states are defined for the UE, including a camped normally state, a camped on any cell state, and an any cell selection state. The UE can work in one of the states, and can also be converted from one state to another. However, none of the states introduces an alert signal, that is, the UE cannot support the alert signal in any of the states, which leads to the fact that the alert signal cannot be applied. SUMMARY

[0006] Embodiments of the present application provide a communication method and apparatus, which enable a terminal to support an alert signal.

[0007] In a first aspect, a first communication method is provided, which can be applied to a first device. The first device is, for example, a terminal-side device, which is also referred to as a terminal device or a terminal. The terminal device is, for example, a terminal apparatus, or another apparatus including a terminal apparatus function, or a circuit, or a chip system (or a chip, such as a modem chip, also referred to as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip including a modem core, or another functional module capable of realizing the function of a terminal apparatus, which is, for example, arranged in a terminal apparatus). The method comprises: determining that a first condition is met in a first state, the first state being a camped normal state, or a camped on any cell state, or an any cell selected state; and entering a second state, wherein in the second state, the terminal is capable of detecting a first synchronization signal and an alarm signal, the first synchronization signal being used for the terminal to synchronize with a network device in the second state, and the alarm signal being used to prompt a missed service or to prompt an arrival of a service.

[0008] The embodiments of the present application provide a new state, for example, a second state, for a terminal. In the second state, the terminal is capable of detecting an alarm signal. In other words, the embodiments of the present application provide a state capable of supporting an alarm signal for a terminal, so that the alarm signal can be applied, and the probability of successful paging of the terminal is improved. Moreover, the second state and the first state can be converted, so that the terminal can enter different states in different situations, to adapt to the working situation of the terminal.

[0009] In an optional implementation, the method further comprises: in the second state, performing one or more of the following: not detecting a second synchronization signal, the second synchronization signal being used for the terminal to synchronize with the network device in the camped normal state or the camped on any cell state; not detecting a paging message; not detecting a short message; not detecting system information; not performing cell reselection; or performing cell reselection evaluation periodically. In the second state, the channel quality between the terminal and the network device can be poor, and cannot support too much communication activity between the terminal and the network device. Therefore, the terminal can not perform one or more communication behaviors in the second state, to save the power consumption of the terminal.

[0010] In an optional implementation, the first state is the camped normal state, and the first condition includes: a measurement result of a first cell is less than or equal to a first threshold, the first cell being a cell in which the terminal camps; and / or a measurement result of the first synchronization signal is greater than or equal to a second threshold. If the measurement result of the first cell is less than or equal to the first threshold, it indicates that the terminal can not obtain better service or even can not obtain service if the terminal continues to be in the camped normal state. If the terminal can search for the first synchronization signal and / or the measurement result of the first synchronization signal is greater than or equal to the second threshold, it indicates that the terminal can enter the second state. Therefore, in the case where the first condition is met, the terminal can enter the second state from the camped normal state to maintain communication with the network device.

[0011] In an optional implementation, the first state is the camped normal state or the camped arbitrary cell state or the arbitrary cell selection state, and the first condition includes: system information from a second cell is detected, and a camped condition of the second cell is not met, and the first synchronization signal is detected according to first configuration information included in the system information, and a measurement result of the first synchronization signal is greater than or equal to a second threshold; or the first synchronization signal is detected according to pre-defined first configuration information, and the measurement result of the first synchronization signal is greater than or equal to the second threshold. If the terminal can detect the first synchronization signal and the measurement result of the first synchronization signal is greater than or equal to the second threshold, it indicates that the terminal can enter the second state. Therefore, in the case where the first condition is met, the terminal can enter the second state from the camped normal state or the camped arbitrary cell state or the arbitrary cell selection state to maintain communication with the network device.

[0012] In a second aspect, a second communication method is provided, which can be applied to a second device. The second device is, for example, a terminal-side device, which is also referred to as a terminal device or a terminal. The terminal device can be introduced with reference to the first aspect. The method includes: in a second state, determining that a second condition is met, wherein in the second state, the terminal can detect a first synchronization signal and an alarm signal, the first synchronization signal being used for the terminal to synchronize with a network device in the second state, and the alarm signal being used to prompt that a service is missed or a service arrives; and entering a first state, the first state being a camped normal state, a camped arbitrary cell state or an arbitrary cell selection state.

[0013] The embodiment of the present application provides a new state, for example, a second state, for a terminal. In the second state, the terminal can detect an alarm signal. In other words, the embodiment of the present application provides a state capable of supporting an alarm state for the terminal, so that the alarm signal can be applied, and the probability of successful paging of the terminal is improved. Moreover, the second state and the first state can be converted, so that the second state and the first state can coexist, and the terminal can enter different states in different cases, so as to adapt to the working condition of the terminal.

[0014] In an optional implementation, the method further includes: in the second state, performing one or more of the following: not detecting a second synchronization signal, the second synchronization signal being used for the terminal to synchronize with the network device in the normal camping state or the arbitrary cell camping state; not detecting a paging message; not detecting a short message; not detecting system information; not performing cell reselection; or, periodically performing cell reselection evaluation. In the second state, the channel quality between the terminal and the network device can be poor, and cannot support too much communication activity between the terminal and the network device. Therefore, the terminal can not perform one or more communication behaviors in the second state, so as to save the power consumption of the terminal.

[0015] In an optional implementation, the first state is a normal camping state, and the second condition includes: periodically performing cell reselection evaluation, and searching for a suitable cell in the cell reselection evaluation; or, a measurement result of the first synchronization signal is greater than or equal to a third threshold, triggering cell reselection evaluation, and searching for a suitable cell in the cell reselection evaluation. If the terminal searches for a suitable cell in the cell reselection evaluation, the terminal can camp on the suitable cell, enter the normal camping state, and thus can normally communicate with the network device, improving the communication quality of the terminal.

[0016] In an optional implementation, the first state is an arbitrary cell selection state, and the second condition includes: the measurement result of the first synchronization signal is less than or equal to a fourth threshold. If the measurement result of the first synchronization signal of the terminal is poor, the terminal can enter the arbitrary cell selection state. In the state, the terminal can search for a suitable cell or accept a cell, so as to obtain the service of the network device.

[0017] In a third aspect, a third communication method is provided, which can be applied to a third device. The third device is, for example, a terminal-side device, which is also referred to as a terminal device or a terminal. The terminal device can be introduced in the first aspect. The method comprises: receiving first system information in a third cell, the first system information comprising configuration information of first synchronization signals of the third cell and at least one cell, wherein the third cell covers a first geographical area, the at least one cell is a cell covering the first geographical area after the third cell, and the first synchronization signals are used for synchronization between a terminal and a network device in a second state, in which the terminal can detect the first synchronization signals and an alarm signal used for prompting a missed service or an arrival of a service; and detecting the first synchronization signals in a fourth cell according to the first system information when a third condition is met, wherein the fourth cell belongs to the at least one cell.

[0018] In the embodiments of the present application, the configuration information of the first synchronization signals of the multiple cells covering the same geographical area is known to the terminal, so that even if the cell changes, the terminal can detect the first synchronization signals in the new cell according to the configuration information of the first synchronization signals in the original cell, thereby synchronizing with the network device to normally use the alarm-related services. Moreover, the third condition is provided in the embodiments of the present application, so that the terminal in the second state can be equivalent to determining the change of the cell even if the cell reselection is not performed, thereby detecting the first synchronization signals in the new cell in time.

[0019] In an optional embodiment, the third cell and the at least one cell belong to the same tracking area. For example, the configuration information of the first synchronization signals of the cells in the same tracking area can be the same, so that the terminal only needs to obtain one piece of configuration information, thereby simplifying the steps of obtaining information by the terminal.

[0020] In an optional embodiment, the first system information comprises the configuration information of the first synchronization signals of the third cell and the at least one cell, which comprises: the first system information comprises first configuration information, wherein the configuration information of the first synchronization signals of the third cell and the at least one cell is the same and is the first configuration information. The configuration information of the first synchronization signals of the third cell and the at least one cell can be the same, so that the network device only needs to send one piece of configuration information (the first configuration information), thereby saving the transmission cost.

[0021] In an optional implementation, the first system information further comprises time domain information and / or frequency domain information of the first synchronization signal of the at least one cell. The time domain information and / or the frequency domain information of the first synchronization signal in different cells can be the same or different, and the network device can further indicate the time domain information and / or the frequency domain information of the first synchronization signal of each cell, so that the terminal can detect the first synchronization signal in the corresponding cell.

[0022] In an optional implementation, the first system information is received in the third cell, comprising: receiving the first system information in the third cell in a first state, the first state being a camped normal state or a camped arbitrary cell state; or, receiving the first system information in the third cell in the second state. The terminal can receive the first system information in the first state, or can also receive the first system information in the second state, which is not limited.

[0023] In an optional implementation, the third condition comprises one or more of the following: determining, according to Doppler information of the third cell, that a distance between a satellite corresponding to the third cell and the terminal is greater than or equal to a fifth threshold; determining, according to ephemeris information of the satellite corresponding to the third cell and position information of the terminal, that a distance between the satellite and the terminal is greater than or equal to the fifth threshold; or, a measurement result of the first synchronization signal in the third cell is less than or equal to a sixth threshold. For the terminal in the second state, the cell reselection process can not be performed, and therefore the terminal can not perceive the change of the cell. Therefore, the third condition is provided in the embodiments of the present application, and the terminal can detect the first synchronization signal based on the judgment of the third condition. When the third condition is met, the terminal can detect the first synchronization signal according to the related information of the first synchronization signal in the next cell indicated by the first system information, but at this time, the terminal can not perceive the change of the cell. That is, the terminal can perform detection according to the first system information when the third condition is met, even if the terminal does not perceive which cell the first synchronization signal is detected in, thereby improving the success rate of detection of the first synchronization signal by the terminal.

[0024] In a fourth aspect, a fourth communication method is provided, which can be applied to a fourth apparatus. The fourth apparatus is, for example, a network-side apparatus, which is also referred to as a network apparatus. The network apparatus is, for example, a network device, or another device including the function of the network device, or a circuit, or a chip system (or chip) or another functional module capable of implementing the function of the network device, which is, for example, arranged in the network device. The network device can be a non-ORAN architecture or an ORAN architecture; or the network device can be a CU, a DU or a RU under the ORAN architecture. The network device is, for example, located on the ground, or the network device is, for example, a non-ground device such as a satellite or an aerial vehicle, or is located on a non-ground device such as a satellite or an aerial vehicle. The method comprises: transmitting, by a third cell, first system information, the first system information comprising configuration information of a first synchronization signal of the third cell and at least one cell, wherein the third cell covers a first geographical area, the at least one cell is a cell covering the first geographical area after the third cell, and the first synchronization signal is used for synchronization between a terminal and a network device in a second state, in which the terminal can detect the first synchronization signal and an alarm signal, and the alarm signal is used to prompt that a service is missed or a service arrives.

[0025] In an optional implementation, the third cell and the at least one cell belong to a same tracking area.

[0026] In an optional implementation, the first system information comprises the configuration information of the first synchronization signal of the third cell and the at least one cell, which comprises: the first system information comprises first configuration information, wherein the configuration information of the first synchronization signal of the third cell and the first synchronization signal of the at least one cell is the same and is the first configuration information.

[0027] In an optional implementation, the first system information further comprises time domain information and / or frequency domain information of the first synchronization signal of the at least one cell.

[0028] In an optional implementation, the transmitting, by a third cell, first system information comprises: transmitting, by the third cell, the first system information corresponding to a first state of the terminal, the first state being a camped normal state or a camped on any cell state; or transmitting, by the third cell, the first system information corresponding to the second state.

[0029] For the technical effects brought by the fourth aspect or the various optional implementations of the fourth aspect, reference can be made to the introduction of the technical effects of the third aspect or the corresponding implementation.

[0030] In a fifth aspect, an apparatus is provided. The apparatus can be a terminal-side apparatus as described in any of the first aspect to the third aspect. The apparatus has the functions of the terminal-side apparatus described above. For example, the apparatus has the functions as described in any of the first aspect to the third aspect, for example, the apparatus includes modules or units or means corresponding to the operations of any of the first aspect to the third aspect, which can be implemented by software, or by hardware, or by a combination of software and hardware. The apparatus is, for example, a terminal device, or another device including the functions of the terminal device, or a chip system (or a chip or a circuit) or another functional module, which can implement the functions of the terminal device, and which is, for example, arranged in the terminal device. In an optional implementation, the apparatus includes a baseband apparatus and a radio frequency apparatus. In another optional implementation, the apparatus includes a processing unit (sometimes also referred to as a processing module) and a transceiving unit (sometimes also referred to as a transceiving module). The transceiving unit can implement a transmitting function and a receiving function. When the transceiving unit implements the transmitting function, it can be referred to as a transmitting unit (sometimes also referred to as a transmitting module). When the transceiving unit implements the receiving function, it can be referred to as a receiving unit (sometimes also referred to as a receiving module). The transmitting unit and the receiving unit can be the same functional module, which is referred to as a transceiving unit and can implement the transmitting function and the receiving function. Alternatively, the transmitting unit and the receiving unit can be different functional modules, and the transceiving unit is a general term for these functional modules.

[0031] In an optional implementation, the processing unit is configured to determine, in a first state, that a first condition is met, the first state being a camped normal state, or a camped on any cell state, or an any cell selected state; and the processing unit is further configured to enter a second state, in which, in the second state, the terminal is capable of detecting a first synchronization signal and an alarm signal, the first synchronization signal being used for the terminal to synchronize with a network device in the second state, and the alarm signal being used to prompt a missed service or to prompt an arrival of a service.

[0032] In an optional implementation, the processing unit is configured to determine, in a second state, that a second condition is met, in which, in the second state, the terminal is capable of detecting a first synchronization signal and an alarm signal, the first synchronization signal being used for the terminal to synchronize with a network device in the second state, and the alarm signal being used to prompt a missed service or to prompt an arrival of a service; and the processing unit is further configured to enter a first state, the first state being a camped normal state, or a camped on any cell state, or an any cell selected state.

[0033] In an optional implementation, the transceiver unit (or the receiving unit) is configured to receive first system information in the third cell, the first system information comprising configuration information of first synchronization signals of the third cell and at least one cell, wherein the third cell covers a first geographical area, the at least one cell is a cell covering the first geographical area after the third cell, and the first synchronization signals are used for synchronization between the terminal and the network device in a second state, in which the terminal can detect the first synchronization signals and an alarm signal used for prompting a missed service or an arrival of a service; and the transceiver unit (or the receiving unit) is further configured to detect the first synchronization signals in a fourth cell according to the first system information when a third condition is met, the fourth cell belonging to the at least one cell.

[0034] In an optional implementation, the apparatus further comprises a storage unit (sometimes also referred to as a storage module), and the processing unit is coupled to the storage unit and is configured to execute programs or instructions in the storage unit to enable the apparatus to perform the functions of the terminal-side apparatus in any of the first aspect to the third aspect.

[0035] In a sixth aspect, an apparatus is provided. The apparatus can be the network-side apparatus in the fourth aspect. The apparatus has the functions of the network-side apparatus. For example, the apparatus has the functions of the fourth aspect, e.g., the apparatus comprises modules or units or means corresponding to the operations of the fourth aspect. The modules or units or means can be implemented in software, hardware or a combination of software and hardware. The apparatus can be a network device, or another device having the functions of a network device, or a chip system (or a chip or a circuit) or another functional module, which can implement the functions of a network device, e.g., in a network device. In an optional implementation, the apparatus comprises a baseband apparatus and a radio frequency apparatus. In another optional implementation, the apparatus comprises a processing unit (sometimes also referred to as a processing module) and a transceiver unit (sometimes also referred to as a transceiver module). The transceiver unit can be implemented as described in the fifth aspect.

[0036] In an optional implementation, the transceiver (or the transmitter) is configured to transmit first system information in the third cell, the first system information comprising configuration information of first synchronization signals of the third cell and at least one cell, wherein the third cell covers a first geographical area, the at least one cell is a cell covering the first geographical area after the third cell, and the first synchronization signals are used for synchronization between the terminal and the network device in a second state, in which the terminal is capable of detecting the first synchronization signals and an alarm signal used for prompting a missed service or an arrival of a service.

[0037] In an optional implementation, the apparatus further comprises a storage unit (also referred to as a storage module), and the processing unit is configured to be coupled with the storage unit and execute programs or instructions in the storage unit to enable the apparatus to perform the functions of the network-side apparatus in the fourth aspect.

[0038] In a seventh aspect, an apparatus is provided, which comprises a memory and one or more processors. The memory is configured to store part or all of the computer programs or instructions necessary for implementing the functions in any of the first aspect to the third aspect. The one or more processors are configured to execute the computer programs or instructions, which, when executed, cause the apparatus to implement the method in any possible design or implementation manner in any of the first aspect to the third aspect.

[0039] In a possible design, the apparatus can further include an interface circuit, and the processor is configured to communicate with other apparatuses or components through the interface circuit.

[0040] In a possible design, the apparatus can further include the memory.

[0041] The apparatus can be a terminal, a communication module in the terminal, or a chip responsible for communication functions such as a modem chip (also referred to as a baseband chip) or an SoC or SIP chip including a modem module.

[0042] In an eighth aspect, an apparatus is provided, which comprises a memory and one or more processors. The memory is configured to store part or all of the computer programs or instructions necessary for implementing the functions in the fourth aspect. The one or more processors are configured to execute the computer programs or instructions, which, when executed, cause the apparatus to implement the method in any possible design or implementation manner in the fourth aspect.

[0043] In a possible design, the apparatus can further include an interface circuit, and the processor is configured to communicate with other apparatuses or components through the interface circuit.

[0044] In a possible design, the apparatus can further include the memory.

[0045] The apparatus can be a network device, a communication module in a network device, or a chip responsible for communication functions in a network device, such as a modem chip (also referred to as a baseband chip) or a SoC or SIP chip including a modem module.

[0046] In a ninth aspect, a communication system is provided, including a network device, where the network device is configured to perform the method performed by the network-side apparatus in the fourth aspect. For example, the network-side apparatus can be implemented by the apparatus in the sixth aspect or the eighth aspect.

[0047] Optionally, the communication system further includes a terminal device, where the terminal device is configured to perform the method performed by the terminal apparatus in any one of the first aspect to the third aspect. For example, the terminal device can be implemented by the apparatus in the fifth aspect or the seventh aspect.

[0048] In a tenth aspect, a computer-readable storage medium is provided, configured to store a computer program or instructions, which, when executed, cause the method performed by the network-side apparatus or the terminal-side apparatus in the aspects to be implemented.

[0049] In an eleventh aspect, a computer program product is provided, including instructions, which, when executed on a computer, cause the method in the aspects to be implemented.

[0050] In a twelfth aspect, a chip system is provided, including a processor and an interface, where the processor is configured to invoke and execute instructions from the interface, so that the chip system implements the method in the aspects. BRIEF DESCRIPTION OF DRAWINGS

[0051] FIG. 1A is a schematic diagram of an access network device structure under an ORAN architecture;

[0052] FIG. 1B is a schematic diagram of a structure of a RAN chip;

[0053] FIGS. 2, 3A-3C are schematic diagrams of several application scenarios of embodiments of the present application;

[0054] FIGS. 4, 6, and 8 are flowcharts of several communication methods provided by embodiments of the present application;

[0055] FIG. 5 is a schematic diagram of a transition of a UE from a first state to a second state in embodiments of the present application;

[0056] FIG. 7 is a schematic diagram of a transition of a UE from a second state to a first state in embodiments of the present application;

[0057] FIG. 9 is a schematic diagram of an apparatus according to an embodiment of the present application;

[0058] FIG. 10 is a schematic diagram of another apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the drawings.

[0060] In the embodiments of the present application, the number of a noun, unless otherwise specified, represents "a singular noun or a plural noun", that is, "one or more". "At least one" means one or more, and "multiple" means two or more than two. "And / or" describes the association relationship of the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone, where A and B can be singular or plural. The character " / " generally represents that the associated objects before and after it are in an "or" relationship. For example, A / B means A or B. "At least one of the following" or similar expressions means any combination of these items, including any combination of single item or multiple items. For example, at least one of a, b, or c means a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0061] The ordinal numbers "first", "second", and the like mentioned in the embodiments of the present application are used to distinguish a plurality of objects, and are not used to limit the size, content, order, time sequence, priority, or importance of the plurality of objects. In addition, the numbering of the steps in each embodiment introduced in the present application is only for distinguishing different steps, and is not used to limit the order of the steps.

[0062] In the following, some terms or concepts in the embodiments of the present application are explained and described, so as to facilitate the understanding of the skilled in the art.

[0063] In the embodiments of the present application, the terminal device is a device with wireless transceiving function, which can be a fixed device, a mobile device, a handheld device (for example, a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device (for example, a communication module, a modem, or a chip system, etc.) built in the above devices. The terminal device is used to connect people, things, machines, etc., and can be widely used in various scenarios, for example, including but not limited to the following scenarios: satellite communication scenarios, sensing scenarios, cellular communication, device-to-device communication (D2D), vehicle-to-everything (V2X), machine-to-machine / machine-type communication (M2M / MTC), internet of things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self driving, remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, unmanned aerial vehicle, robot, indoor commercial scenarios (such as mobile phone screen projection, file sharing, mobile phone video transmission to VR glasses), etc. When the terminal device is applied to V2X, it can also be referred to as a V2X device, for example, a smart car, a digital car, an unmanned car, a self-driving car, a pure EV, a hybrid electric vehicle (HEV), a range extended EV (REEV), a plug-in HEV (PHEV), a new energy vehicle, a road site unit (RSU), etc. The terminal device can also be a device in D2D communication, for example, a water meter, a gas meter, etc.

[0064] In addition, in the embodiments of the present application, the terminal device can also be a terminal device in an internet of things (IoT) system. The IoT is an important part of future information technology development. Its main technical feature is to connect objects to a network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-object interconnection.

[0065] As introduced above, various terminal devices can be considered as vehicle-mounted terminal devices if they are located on a vehicle (e.g., placed in or installed in a vehicle), which are also called on-board units (OBU). The terminal device of the present application can also be an on-board module, on-board module group, on-board component, on-board chip or on-board unit built in a vehicle as one or more components or units, and the vehicle can implement the method of the present application through the built-in on-board module, on-board module group, on-board component, on-board chip or on-board unit.

[0066] The terminal device can also be referred to as a UE, terminal, access station, UE station, remote station, wireless communication device, or user equipment, etc.

[0067] In the embodiments of the present application, the device for implementing the function of the terminal device can be a terminal device, which can be a terminal device or a device capable of supporting the terminal device to implement the function, such as a chip system, which can be installed in the terminal device. In the technical solutions provided in the embodiments of the present application, the device for implementing the function of the terminal device is taken as an example to describe the technical solutions provided in the embodiments of the present application.

[0068] The network device in the embodiments of the present application, for example, includes an access network device (or an access network network element) and / or a core network device (or a core network network element). The access network device is a device with wireless transceiving function, used for communicating with the terminal device. The access network device includes but is not limited to a base station (a base transceiver station (BTS), a Node B, an evolved Node B (eNodeB) / eNB, or a next generation Node B (gNodeB) / gNB), a transmission reception point (TRP), a base station evolved in the future of the 3rd generation partnership project (3GPP), an access node in a wireless fidelity (Wi-Fi) system, a wireless relay node, a wireless backhaul node, and the like. The base station can be a macro base station, a micro base station, a pico base station, a small station, a relay station, and the like. A plurality of base stations can support a network of the same access technology or a network of different access technologies. A base station can include one or more co-sited or non-co-sited transmission reception points. The access network device can also be a wireless controller, a centralized unit (CU), and / or a distributed unit (DU) in a cloud radio access network (CRAN) scenario. The access network device can also be a server and the like. For example, the network device in the V2X technology can be a road side unit (RSU). The access network device is described below by taking a base station as an example. The base station can communicate with the terminal device or communicate with the terminal device through a relay station. The terminal device can communicate with a plurality of base stations in different access technologies. The core network device is used to implement mobile management, data processing, session management, policy and charging, and the like. The names of devices implementing core network functions in systems of different access technologies can be different, and the embodiments of the present application do not limit this.Taking a 5th generation (5G) system as an example, the core network device includes, for example, an access and mobility management function (AMF), a session management function (SMF), a policy control function (PCF), a user plane function (UPF), and the like.

[0069] In the CU-DU architecture, or in an open RAN (ORAN) system, the access network device can include one or more of a central unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), and the like. The CU and the DU can be separately arranged, or can be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). For a structure of the access network device, refer to FIG. 1A. The core network device and the access network device can communicate through a backhaul link; the CU and the DU in the access network device can communicate through a middlehaul link, and the DU and the RU can communicate through a front-haul link.

[0070] Alternatively, another structure of the access network device can refer to FIG. 1B, which takes the example of the access network device being implemented by a chip, for example, referred to as a RAN chip. The RAN chip can include a CU, a DU, and a RU. The CU can perform L2 functions, L3 functions, and the like. The DU can perform L1 functions, part of L2 functions, and the like. The RU can perform calculation of L1 and radio frequency (RF) digital part functions, and the like. The CU communicates with the core network device through a backhaul interface, which carries traffic between the CU and the core network device. The CU can include a central processing unit (CPU) of an X86 architecture or an ARM architecture, and an accelerator including a field programmable gate array (FPGA), a graphics processing unit (GPU), or other accelerators, and the like. The CPU and the FPGA, GPU, or other accelerators can communicate through a peripheral component interconnect express (PCIe) interface.

[0071] The CU communicates with the DU through a midhaul interface, which carries traffic between the CU and the DU. The DU can include a CPU of an X86 architecture or an ARM architecture, and an accelerator including an FPGA, a GPU, or other accelerators, and the like. The CPU and the FPGA, GPU, or other accelerators can communicate through a PCIe interface.

[0072] The DU communicates with the RU through a fronthaul interface, which carries traffic between the DU and the RU. If the access network device adopts an integrated DU, the integrated DU can include the functions of the DU and the RU described above, and the RAN can no longer separately include the RU. The RU can include a RAN fronthaul processing unit (RAN FH processing unit), a digital processing unit, and a radio frequency processing unit (RF processing unit). The RAN FH processing unit is implemented by, for example, an FPGA or an application specific integrated circuit (ASIC). The digital processing unit is implemented by, for example, an FPGA or an ASIC.

[0073] The RU can be connected with an antenna to communicate with the UE through the antenna.

[0074] The CU (or CU-CP and CU-UP), DU or RU can also have different names in different systems, but those skilled in the art can understand their meanings. For example, in an ORAN system, the CU can also be referred to as an open CU (O-CU), the DU can also be referred to as an open DU (O-DU), the CU-CP can also be referred to as an open CU-CP (O-CU-CP), the CU-UP can also be referred to as an open CU-UP (O-CU-UP), and the RU can also be referred to as an open RU (O-RU). For the convenience of description, the CU, CU-CP, CU-UP, DU and RU are taken as examples for description in the embodiments of the present application. Any one of the CU (or CU-CP, CU-UP), DU and RU in the embodiments of the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0075] The CU and the DU can be configured according to the protocol layer functions of the wireless network they implement. For example, the CU is configured to implement the functions of the packet data convergence protocol (PDCP) layer and the protocol layers above the PDCP layer (such as the radio resource control (RRC) layer and / or the service data adaption protocol (SDAP) layer, etc.); the DU is configured to implement the functions of the protocol layers below the PDCP layer (such as one or more of the radio link control (RLC) layer, the media access control (MAC) layer, or the physical (PHY) layer). For another example, the CU is configured to implement the functions of the PDCP layer and the protocol layers above the PDCP layer (such as the RRC layer and / or the SDAP layer), and the DU is configured to implement the functions of the protocol layers below the PDCP layer (such as one or more of the RLC layer, the MAC layer, or the PHY layer).

[0076] The above configuration of the CU and the DU is merely an example, and the CU and the DU can be configured to have functions as needed. For example, the CU or the DU can be configured to have functions of more protocol layers, or the CU or the DU can be configured to have partial processing functions of the protocol layers. For example, partial functions of the RLC layer and functions of protocol layers above the RLC layer are arranged in the CU, and the remaining functions of the RLC layer and functions of protocol layers below the RLC layer are arranged in the DU. For another example, the functions of the CU or the DU can be divided according to a service type or other system requirements, for example, according to a delay requirement. For example, functions that require to meet a relatively low delay requirement are arranged in the DU, and functions that do not require to meet the delay requirement are arranged in the CU.

[0077] The DU and the RU can cooperate to implement the functions of the PHY layer. One DU can be connected to one or more RUs. The functions of the DU and the RU can be configured in various manners according to design. For example, the DU is configured to implement baseband functions, and the RU is configured to implement intermediate radio frequency functions. For another example, the DU is configured to implement high-layer functions in the PHY layer, and the RU is configured to implement low-layer functions in the PHY layer or implement the low-layer functions and radio frequency functions. The high-layer functions in the PHY layer can include a part of functions of the PHY layer that are closer to the MAC layer, and the low-layer functions in the PHY layer can include another part of functions of the PHY layer that are closer to the intermediate radio frequency side.

[0078] In the embodiments of the present application, the device for implementing the function of the network device can be referred to as a network device, which can be a network element or a network device, or a device capable of supporting the network device or the network element to implement the function, such as a chip system, which can be installed in the network device. In the technical solutions provided in the embodiments of the present application, the device for implementing the function of the network device is taken as an example (for example, the device for implementing the function of the access network device is an access network device, and the device for implementing the function of the core network device is a core network device), and the technical solutions provided in the embodiments of the present application are described.

[0079] The technical features related to the embodiments of the present application are described below.

[0080] Currently, several states are defined for the UE, and the UE is in one of the states at a certain moment. For example, the states of the UE include a camped normally state, a camped on any cell state, and an any cell selection state.

[0081] The camped normally state can be applicable to a UE in a radio resource control (RRC) idle state or an RRC inactive state. The UE in the camped normally state can camp on a suitable cell. The UE can obtain normal service in the suitable cell, and thus the normal service corresponds to the camped normally state. The suitable cell belongs to a public land mobile network (PLMN) that is a selectable PLMN or a registered PLMN for the UE, or a PLMN on an equivalent PLMN list. The UE also satisfies a cell selection condition for the suitable cell. It can be understood that the suitable cell has a signal quality that is good enough to satisfy a threshold configured in system information (SI).

[0082] When the UE cannot find a suitable cell, the UE can search for an acceptable cell. The UE camps on the acceptable cell for a short time, and the UE can obtain limited service in the acceptable cell, such as initiating an emergency call or receiving an emergency broadcast (earthquake and tsunami warning system (ETWS) and commercial mobile alert system (CMAS)). The state of the UE camped on the acceptable cell can be a camped on any cell state, and thus the limited service corresponds to the camped on any cell state. The camped on any cell state can be applicable to a UE in an RRC idle state. The acceptable cell only needs to satisfy a condition for camping, and there is no limitation on a PLMN to which the acceptable cell belongs.

[0083] When the UE cannot camp on either a suitable cell or an acceptable cell, the UE is in an any cell selection state. In the any cell selection state, the UE can continuously search for a suitable cell or an acceptable cell.

[0084] In addition, in satellite communication technology, a UE can not receive a paging message from a network due to no satellite alignment. Therefore, a technology for notifying the UE is proposed, which can be understood as a technology for enhancing paging, or a technology for informing the UE after a service is missed (e.g., after paging fails), which can be referred to as an alert technology, or can have other names, such as resilient notification, etc. The other names can be replaced with "alert" and vice versa, which is not limited herein. For example, the network can search for the UE through an alert service or a resilient notification service. The service can notify the UE by sending an alert message or a resilient notification. Hereinafter, the name "alert" is taken as an example. The alert message can carry the identity of the UE, so as to search for a specific UE; the UE can determine whether the message is for the UE according to the identity in the alert message. Alternatively, the alert message can not carry the identity of the UE, and the alert message can not be used to search for a specific UE; however, in order for all UEs to receive the alert message, the alert message can be similar to system information. In order to ensure that the network can notify the UE, the UE needs to be synchronized with the network to receive the alert message, and therefore the network needs to provide a synchronization signal for the UE to receive the alert message. In the embodiments of the present application, the synchronization signal for the UE to receive the alert message and the alert message (or, the "alert message" can be replaced with "a signal carrying the alert message". Hereinafter, the "alert message" is taken as an example) are collectively referred to as an alert signal, that is, the alert signal can refer to the synchronization signal for the UE to receive the alert message, or refer to the alert message, or refer to both signals.

[0085] The alert technology can improve the coverage of the alert signal. For example, by reducing the coding rate of the alert signal, or by repeatedly transmitting the alert signal or increasing the transmission power of the alert signal, etc., so that the alert signal can be received by the UE. For the UE, when the signal is poor (for example, the UE cannot normally receive the service, such as cannot normally receive the normal paging), the UE can receive information from the network by receiving the alert signal.

[0086] However, according to the above introduction, the current UE does not introduce detection and reception of the alert signal in several states, that is, the UE cannot support the alert signal in any of the several states, which leads to the non-application of the alert signal.

[0087] Therefore, the embodiments of the present application provide a new state for the UE, for example, called the second state. In the second state, the UE can detect the alert signal. That is, the embodiments of the present application provide a state for the UE that can support the alert signal, so that the alert signal can be applied, and the probability of successful paging of the UE is improved. Moreover, the second state and the first state can be converted, so that the UE can enter different states under different conditions to adapt to the working condition of the UE.

[0088] The communication method provided by the embodiments of the present application can be applied to a fourth generation (4th generation, 4G) communication system, such as a long term evolution (long term evolution, LTE) communication system, and can also be applied to a fifth generation (5th generation, 5G) communication system, such as a 5G new radio (new radio, NR) communication system, or to various communication systems evolved after 5G, such as a future communication system. The method provided by the embodiments of the present application can also be applied to a bluetooth system, a wireless fidelity (wireless fidelity, Wifi) system, a long range radio (long range radio, LoRa) system or a vehicle networking system. The method provided by the embodiments of the present application can also be applied to a terrestrial network (terrestrial network, TN), for example, to a scenario in which the UE is in weak coverage in the terrestrial network; or, the method provided by the embodiments of the present application can also be applied to a non-terrestrial network (non-terrestrial network, NTN), such as a satellite communication system, for example, can be applied to a transparent satellite architecture, a backhaul satellite architecture or a regenerative satellite architecture, etc., without limitation.

[0089] Please refer to FIG. 2, which is a schematic diagram of an application scenario of an embodiment of the present application. FIG. 2 includes a first device and a second device. The second device can send a synchronization signal (for example, a first synchronization signal and / or a second synchronization signal) and / or an alert signal, and the first device can receive a signal from the first device. The first device is, for example, a UE, and the second device is, for example, a network device (for example, an access network device, a core network device, an RSU, or a control node). Alternatively, the first device and the second device are two different UEs. Alternatively, the first device and the second device can be two different network devices, for example, the first device is an RSU or a control node, and the second device is an access network device or a core network device.

[0090] Please refer to FIGS. 3A-3C, which are schematic diagrams of several network architectures of NTN and are schematic diagrams of several application scenarios of embodiments of the present application. For the architecture in which a UE is connected to a ground access network through a satellite, it can be referred to as a transparent satellite architecture (for example, FIG. 3A). For the architecture in which an access network device is arranged on a satellite (or the satellite has the function of an access network device), it can be referred to as a regenerative satellite architecture or a regenerative star architecture (for example, FIG. 3B). For the architecture in which a UE is connected to a ground access network and then connected to a ground network through a satellite, it can be referred to as a satellite backhaul architecture (for example, FIG. 3C).

[0091] In FIG. 3A, network elements (for example, an access network device and / or a core network device) for transmitting services are all located on the ground. A UE accesses an access network device located on the ground through a satellite, thereby accessing a network. The satellite has a transparent function.

[0092] In FIG. 3B, an access network device is arranged on a satellite, or a bottom layer processing module of an access network element is arranged on the satellite, or the satellite has part or all of the functions of an access network device. In addition to the access network device, other network elements (for example, a core network device) for transmitting services are located on the ground. Alternatively, part or all of the network elements in the core network can also be arranged on the satellite, or the satellite can have the functions of part or all of the network elements in the core network.

[0093] In FIG. 3C, an access network device is located on the ground. A UE communicates with a satellite through an access network on the ground and then connects to a ground network through the satellite.

[0094] Optionally, the satellite in FIG. 3A, FIG. 3B, or FIG. 3C can be replaced by an unmanned aerial vehicle or a high-altitude aerial vehicle or other aerial device.

[0095] The method provided by the embodiments of the present application is described below with reference to the drawings. In various embodiments of the present application, the alert signal can also be referred to as a robust notification signal, or can also be referred to as a resilient notification, or can also have other names, and the alert signal is taken as an example herein. The alert signal can be sent in a broadcast manner. The function of the alert signal is to notify a UE, similar to paging, and can be used to transmit information to a specific UE. For example, the alert signal can be used to prompt a missed service (for example, a missed called service), or to indicate information of a missed called service, or can be used to page a UE, or to prompt arrival of a service, or to prompt a change in an environment in which the UE is located, or to prompt the UE to be aligned with a satellite, or to prompt the UE to move to a line of sight (LoS) path between the UE and the satellite, or to prompt improvement of channel quality of the UE, and the like. Optionally, coverage enhancement can be set for the alert signal, for example, the alert signal can satisfy one or more of the following: a lower coding rate, can be sent multiple times, or is sent using higher power (for example, higher than the transmission power of a paging message, and / or higher than a certain power threshold). By satisfying one or more of the above, the success rate of reception of the alert signal by the UE can be improved. After receiving the alert signal, the UE can enter an RRC connected state, or can output prompt information to prompt a user to change the environment in which the UE is located, or to prompt the user to align the UE with a satellite, or to prompt the user to move the UE to a LoS path between the UE and the satellite, or to prompt the user to improve channel quality of the UE, or to remind the user of a called service, or to remind the user of a missed called service, and the like.

[0096] For example, a network device (for example, a core network device and / or an access network device) can no longer send a paging message, but instead uses the alert signal to replace the paging message. For example, when the network device needs to page a UE, the UE can be paged by sending an alert signal. Alternatively, a paging message can still be sent, and if a paging message sent by a network device (for example, a core network device and / or an access network device) does not receive a response from the UE, the network device (for example, a core network device and / or an access network device) can send an alert signal, and because the alert signal is subjected to coverage enhancement processing, the success rate of reception of the alert signal by the UE is relatively high. Alternatively, the alert signal can also be sent in other scenarios, and the embodiments of the present application do not limit this.

[0097] The optional steps represented by the dashed lines in the drawings corresponding to various embodiments of the present application are optional steps. The various embodiments herein can be applied to the network architecture shown in any one of FIG. 2, FIG. 3A-FIG. 3C. For example, the UE described in the various embodiments herein can be the first device shown in FIG. 2, and the network device described in the various embodiments herein can be the second device shown in FIG. 2. It can be understood that the various embodiments herein are taken as an example that the first device is a UE and the second device is a network device, but are not limited thereto. For another example, the UE described in the various embodiments herein can be the UE or a functional module in the UE shown in any one of FIG. 3A-FIG. 3C, and the network device described in the various embodiments herein can be the access network device or a functional module in the access network device shown in any one of FIG. 3A-FIG. 3C.

[0098] The embodiment of the present application provides a communication method, please refer to FIG. 4, which is a flowchart of the method.

[0099] S401, the UE determines that a first condition is met in a first state.

[0100] S402, the UE enters a second state. The S401 and S402 are uniformly introduced as follows.

[0101] The first state is, for example, a camped normally state, a camped on any cell state, or an any cell selection state. The first condition can be understood as a transition condition for entering the second state from the first state, and the first condition can be different according to the different first states.

[0102] Optionally, if the first state is the camped normally state, the first condition can include one or more of the following: a measurement result of a first cell is less than or equal to a first threshold, an alert signal can be detected (for example, a first synchronization signal for receiving the alert signal can be detected), or a measurement result of the alert signal (for example, the first synchronization signal) is greater than or equal to a second threshold. The first cell is a cell currently camped by the UE. The configuration information of the first synchronization signal can be predefined by a protocol, or configured by a network device, or preconfigured in the UE, and the UE can detect the first synchronization signal according to the configuration information. If configured by the network device, for example, the network device can send the configuration information of the first synchronization signal through system information or other messages. The configuration information of the first synchronization signal includes, for example, one or more of the following: time domain resources occupied by the first synchronization signal, frequency domain resources occupied by the first synchronization signal, a sequence corresponding to the first synchronization signal, or a period in which the first synchronization signal appears.

[0103] The first threshold and / or the second threshold can be configured by the network device, or predefined by a protocol, or pre-configured in the UE. If configured by the network device, the network device can configure the first threshold and / or the second threshold through system information or other messages. Optionally, the first threshold can be a threshold for camping (e.g., camping on the first cell) broadcast by the network device through system information; or the first threshold can be a threshold for camping with a first offset added thereto; or the first threshold can be a threshold for triggering cell reselection; or the first threshold can be a newly defined threshold, e.g., a threshold for determining the first condition, which is not limited herein.

[0104] The measurement result of the first cell is, for example, a measurement result of a signal from the first cell, which includes, for example, a synchronization signal of the first cell, which can be referred to as a second synchronization signal. The second synchronization signal can be used for the UE to synchronize with the network device in the camped normally state or the camped on any cell state, e.g., the UE can detect the second synchronization signal when in the camped normally state or the camped on any cell state. The second synchronization signal includes, for example, a synchronization signal and a physical broadcast channel (PBCH) block (SSB), or other signals for synchronization. If the measurement result of the UE on the second synchronization signal does not satisfy the first threshold, the UE can determine that the channel quality of the first cell has deteriorated, the UE cannot normally camp on the first cell, or the UE needs to start detecting the alert signal, e.g., the first synchronization signal.

[0105] The first synchronization signal can be used for the UE to synchronize with the network device in the second state. The second state can be a state newly introduced in the embodiments of the present application, and the second state can correspond to the UE obtaining an alert service or a resilient service. In the second state, the UE needs to detect the first synchronization signal for receiving an alert message and the alert message. In other words, the embodiments of the present application newly define a second state for the UE, so that the UE can detect the alert signal in the second state, that is, so that the UE can support the reception of the alert signal, so that the alert signal can be applied, and the probability of successful paging of the UE is improved, or the success rate of information transmission of the network in a low coverage situation is improved. The second state can also be referred to as a camped on alert (resilient) state, or an alert state, and the name is not limited. In the second state, the UE does not need to detect the second synchronization signal. The UE also has the need to synchronize with the network in the second state, so the embodiments of the present application introduce the first synchronization signal, so that the UE can also synchronize with the network device according to the first synchronization signal in the second state. The first synchronization signal can be a newly designed synchronization signal for receiving the alert message; or the first synchronization signal can also be an enhanced signal of the current SSB; or the first synchronization signal can also reuse part or all of the current SSB, which is not limited here. For example, the structure of the first synchronization signal is the same as that of the SSB, for example, the first synchronization signal can be referred to as SSB X. Or the first synchronization signal can also adopt other structures and / or other names, which are not limited.

[0106] The measurement of the UE on the alert signal can be the measurement on the first synchronization signal, or the measurement on the alert message, which is not limited here. The first condition can include that the measurement result of the UE on the alert signal is greater than or equal to a second threshold. Optionally, the second threshold can be a cell (for example, the first cell) threshold for camping on the network, which is reduced by a second offset; or the second threshold can also be a newly defined threshold. For example, it is a threshold for determining the first condition. The measurement result of the alert signal satisfying the second threshold is mainly to ensure that the channel quality of the UE can support the UE to normally receive the alert message.

[0107] The measurement result, for example, includes a reference signal receiving power (RSRP), or includes other parameters that can measure the signal quality, whether it is the measurement result of the first cell or the measurement result of the first synchronization signal.

[0108] If the measurement result of the first cell is less than or equal to the first threshold, it indicates that the UE, if continuing to be in the camped normally state, can not obtain better service, or even can not obtain service, or needs to start detecting the alert signal. The first synchronization signal can be searched and / or the measurement result of the first synchronization signal is greater than or equal to the second threshold, which indicates that the UE can enter the second state. Therefore, under the condition of satisfying the first condition as above, the UE can enter the second state from the camped normally state.

[0109] Taking the first condition including the measurement result of the first cell being less than or equal to the first threshold, the first synchronization signal being detected, and the measurement result of the first synchronization signal being greater than or equal to the second threshold as an example. Optionally, for the first condition, it can be understood that if the measurement result of the first cell by the UE is less than or equal to the first threshold (for example, the first threshold is less than or equal to the threshold for triggering cell reselection), the UE can be triggered to perform cell reselection. In the cell reselection, if a suitable cell is selected, the UE can reselect to the suitable cell, in which case the UE can continue to be in the camped normally state and not enter the second state. Or, in the cell reselection, if a suitable cell is not selected, in which case, if the UE can detect the first synchronization signal and the measurement result of the first synchronization signal is greater than or equal to the second threshold, the UE can enter the second state; and if the UE cannot detect the first synchronization signal, or although the first synchronization signal is detected, the measurement result of the first synchronization signal is less than the second threshold, the UE can not enter the second state, for example, the UE can enter the any cell selection state, or the UE can continue to perform cell reselection to select an acceptable cell, thereby entering the camped on any cell state.

[0110] Optionally, if the first state is the camped on any cell state or the any cell selection state, the first condition can include: detecting system information from the second cell and not satisfying the camping condition of the second cell, and the measurement result of the first synchronization signal detected according to the first configuration information included in the system information being greater than or equal to the second threshold; or, the first synchronization signal is detected according to the predefined first configuration information, and the measurement result of the first synchronization signal is greater than or equal to the second threshold.

[0111] For example, the UE in the camped on any cell state or the any cell selection state can periodically search for a suitable cell. For example, the UE finds system information from a second cell, which includes configuration information for receiving the alert signal, e.g., configuration information of the first synchronization signal (first configuration information), but the UE does not meet the camping condition of the second cell and cannot camp on the second cell. In addition, the UE detects the first synchronization signal according to the first configuration information, and the measurement result of the UE on the first synchronization signal is greater than or equal to the second threshold, then the UE can enter the second state from the camped on any cell state or the any cell selection state.

[0112] For another example, the configuration information of the first synchronization signal (first configuration information) can also not be obtained through system information, but be predefined by a protocol or preconfigured in the UE, and then the UE can detect the first synchronization signal according to the predefined or preconfigured first configuration information. For example, the time domain resource of the first synchronization signal configured by the first configuration information is periodic, and then the UE can periodically detect the first synchronization signal. If the UE detects the first synchronization signal, and the measurement result of the UE on the first synchronization signal is greater than or equal to the second threshold, then the UE can enter the second state from the camped on any cell state or the any cell selection state.

[0113] In the second state, the UE can perform one or more of the following: not detecting the second synchronization signal, not detecting the paging message, not detecting the short message, not detecting the system information, not performing cell reselection, or periodically performing cell reselection evaluation. Alternatively, the UE can perform one or more of the following when the signal strength of the alert signal meets the condition: not detecting the second synchronization signal, not detecting the paging message, not detecting the short message, not detecting the system information, not performing cell reselection, or periodically performing cell reselection evaluation.

[0114] For example, in the second state, the UE can no longer perform part or all of the detection behavior of the UE in the first state, so that the UE can reduce or reduce the detection of unnecessary signals in the second state, saving the UE power consumption. For example, the detection behavior of the UE in the first state includes one or more of the following: detecting the second synchronization signal, detecting the paging message, detecting the short message, detecting the system information, or performing cell reselection evaluation.

[0115] For example, in the second state, the UE can only periodically detect the second synchronization signal. When a suitable cell is found, the UE can reselect to the suitable cell in time, so as to make the UE return to the camped normally state more quickly, and perform normal communication. For another example, the UE can perform the detection behavior in the first state of the UE only when the signal strength of the alert signal meets a condition, for example, the signal strength of the first synchronization signal meets a condition, so that the UE can determine that there is a suitable cell, for example, there is a potential condition for the second synchronization signal, according to the signal strength of the first synchronization signal, and thus can start searching or detecting the second synchronization signal. Optionally, if the UE does not detect a suitable cell in the second state, the UE still stays in the second state.

[0116] For example, in the second state, the UE can only periodically detect the second synchronization signal. When a suitable cell is found, the UE can reselect to the suitable cell in time, so as to make the UE return to the camped normally state more quickly, and perform normal communication. For another example, the UE can perform the detection behavior in the first state of the UE only when the signal strength of the alert signal meets a condition, for example, the signal strength of the first synchronization signal meets a condition, so that the UE can determine that there is a suitable cell, for example, there is a potential condition for the second synchronization signal, according to the signal strength of the first synchronization signal, and thus can start searching or detecting the second synchronization signal. Optionally, if the UE does not detect a suitable cell in the second state, the UE still stays in the second state.

[0117] In the embodiments of the present application, the first state is, for example, the camped normally state, the camped on any cell state, or the any cell selection state. For example, no matter which state the first state is, the UE can enter the second state through the first condition in the state, that is, the embodiments of the present application can support entering the second state from the camped normally state, or support entering the second state from the camped on any cell state, or support entering the second state from the any cell selection state. When the embodiments of the present application support entering the second state from multiple states, the state conversion can be more flexible.

[0118] Alternatively, embodiments of the present application can only support the transition between certain or several first states and the second state. For example, embodiments of the present application only support the transition from the camped normally state to the second state, but do not support the transition from the camped on any cell state to the second state, nor the transition from the any cell selection state to the second state. For another example, embodiments of the present application only support the transition from the camped on any cell state to the second state, but do not support the transition from the camped normally state to the second state, nor the transition from the any cell selection state to the second state. For another example, embodiments of the present application only support the transition from the any cell selection state to the second state, but do not support the transition from the camped on any cell state to the second state, nor the transition from the camped normally state to the second state. For another example, embodiments of the present application support the transition from the any cell selection state to the second state, and support the transition from the camped on any cell state to the second state, but do not support the transition from the camped normally state to the second state. When embodiments of the present application only support the transition from the camped normally state to the second state, since the UE always needs to transit from the state of camping on a normal cell to the second state, the UE can acquire the configuration information through the camped cell and maintain synchronization, which can avoid the blind search of the UE without indication information, and help to save the energy consumption of the UE.

[0119] If embodiments of the present application do not support the transition between certain first states and the second state of the UE, the behavior of the UE in the first state can refer to the prior art, i.e., the behavior is not affected by embodiments of the present application, or is understood as not affected by the alert signal. For example, if embodiments of the present application only support the transition from the camped normally state to the second state, but do not support the transition from the camped on any cell state to the second state, nor the transition from the any cell selection state to the second state, the behavior of the UE in the camped on any cell state can completely refer to the prior art, and the behavior of the UE in the any cell selection state can also completely refer to the prior art.

[0120] The embodiment of the present application provides a new state, for example, a second state, for the UE. In the second state, the UE can detect the alert signal. In other words, the embodiment of the present application provides a state that can support the alert state, so that the alert signal can be applied, and the probability of UE being notified successfully is improved. Moreover, the second state can be converted into the first state, and the UE can enter different states in different cases, so as to adapt to the working condition of the UE.

[0121] The embodiment of the present application provides another communication method, and reference can be made to FIG. 6 for a flowchart of the method.

[0122] S601. In the second state, the UE determines that a second condition is met.

[0123] S602. The UE enters the first state. The S601 and S602 are uniformly introduced as follows.

[0124] The first state is for example a camped normally state, a camped on any cell state, or an any cell selection state. The second condition can be understood as a conversion condition for entering the first state from the second state, and the second condition can be different according to the first state.

[0125] Optionally, the first state is the camped normally state, and the second condition can include: performing a cell reselection evaluation periodically, and searching for a suitable cell in the cell reselection evaluation; or a measurement result of the first synchronization signal or the alert signal is greater than or equal to a third threshold, triggering the cell reselection evaluation, and searching for a suitable cell in the cell reselection evaluation. Alternatively, the second condition can include that the UE searches for a suitable cell in the cell reselection evaluation, and the cell reselection evaluation can be periodic, or can be triggered according to the measurement result of the first synchronization signal, for example, the measurement result of the first synchronization signal or the alert signal of the UE is greater than or equal to the third threshold, and the cell reselection evaluation process can be triggered. The measurement result of the first synchronization signal or the alert signal includes for example an RSRP, or other parameters that can measure signal quality.

[0126] Alternatively, the first state is the camped normally state, and the second condition can include: searching for a suitable cell through the cell reselection evaluation. In the first state, the UE can perform the cell reselection evaluation periodically, and when a suitable cell is searched in the cell reselection evaluation, the UE can enter the first state.

[0127] Alternatively, the first state is a camped normally state. The UE in the second state can trigger a cell reselection evaluation when the measurement result of the alert signal (e.g., the first synchronization signal and / or the alert message) is greater than or equal to a third threshold; and the UE can enter the first state when a suitable cell is found in the cell reselection evaluation.

[0128] In the cell reselection evaluation, the UE can find a suitable cell or can not find a suitable cell. If the UE can find a suitable cell, the UE can determine that there is a selectable cell; or if the UE can not find a suitable cell, the UE can determine that there is no selectable cell. If the UE can find a suitable cell, the UE can reselect to the suitable cell, and the UE can enter the camped normally state in the suitable cell. Thus, finding a suitable cell in the cell reselection evaluation can be used as a condition for the UE to transition to the camped normally state. If the UE can not find a suitable cell, the UE can continue to stay in the second state.

[0129] The third threshold can be configured by a network device, or predefined by a protocol, or preconfigured in the UE. If configured by the network device, the network device can configure the third threshold through system information or other messages.

[0130] For the alert signal (e.g., the first synchronization signal) and the second state, refer to the description of the embodiment shown in FIG. 4.

[0131] Alternatively, if the first state is the any cell selection state, the second condition can include that the measurement result of the first synchronization signal or the alert signal is less than or equal to a fourth threshold. The fourth threshold can be configured by a network device, or predefined by a protocol, or preconfigured in the UE. If configured by the network device, the network device can configure the fourth threshold through system information or other messages.

[0132] If the measurement result of the UE on the first synchronization signal or the alert signal is poor, it indicates that the UE can not normally receive even for the first synchronization signal or the alert signal. In this case, the UE can enter an any cell selection state. In the any cell selection state, the UE can constantly search for a suitable cell or an acceptable cell to obtain the service of the network.

[0133] In the second state, the UE can perform one or more of the following: not detect the second synchronization signal, not detect the paging message, not detect the short message, not detect the system information, not perform cell reselection, or periodically perform cell reselection evaluation. For more information about this part, please refer to the description of the embodiment shown in FIG. 4.

[0134] Optionally, the method can further include S603, in the case where the fourth condition is met, the UE initiates a tracking area update (TAU).

[0135] For example, the second state is a camped on alert state, and the first state is a camped normally state. When the UE enters the camped normally state from the camped on alert state, if the fourth condition is met, the UE can initiate a TAU.

[0136] Optionally, the fourth condition can include one or more of the following: every time the UE enters or enters after the first state from the second state; every time the UE enters or enters after the first state from the second state, and the periodic TAU timer has timed out when the UE is in the second state; or every time the UE enters or enters after the first state from the second state, and the UE receives an alert message in the second state.

[0137] As an optional implementation, the UE can initiate the TAU each time when the UE enters the first state from the second state or after entering the first state. The UE can not support uplink transmission when in the second state, and thus can not perform the TAU. Therefore, when the UE enters the first state and can initiate the TAU, the UE can trigger the TAU to reduce the probability of expiration of the periodic TAU timer of the UE. If the UE does not perform the TAU for multiple times, for example, the periodic TAU timer of the UE expires for multiple times, the network can deregister the UE. If the UE is deregistered, the network will not search for the UE through the alert signal any more. Even if the UE is still monitoring the alert signal, the network will not send the alert signal to the UE. Therefore, the embodiments of the present application enable the UE to perform the TAU in time, and can reduce the probability of expiration of the periodic TAU timer, thereby reducing the probability of deregistration of the UE.

[0138] As another optional implementation, if the periodic TAU timer of the UE expires when the UE is in the second state, the UE can initiate the TAU each time when the UE enters the first state from the second state or after entering the first state, which is equivalent to that the UE initiates the TAU after recovering to the state in which the UE can normally communicate with the network from the state in which the UE has the TAU problem in the second state. The UE can initiate the TAU only when the periodic TAU timer expires when the UE is in the second state, which can reduce the probability of deregistration of the UE by the network, reduce the transmission resources occupied by the UE due to initiation of the TAU when the UE has frequent state switching, and save the power consumption of the UE due to initiation of the TAU.

[0139] As another optional implementation, if the UE receives the alert message in the second state, the UE can initiate the TAU each time when the UE enters the first state from the second state or after entering the first state. The alert message is, for example, a message for notifying the UE, for example, a message for notifying the UE of missing paging or missing service, and the description of the alert message can be referred to the foregoing. This implementation can be understood as that the UE has the situation in which the network device searches for the UE and the UE does not respond in the second state, and the UE can initiate the TAU when or after the UE recovers to the state in which the UE can normally communicate with the network. For example, the UE can initiate the TAU only when the UE receives the alert message in the second state, which can enable the network to learn in time that the UE recovers to the normal state after the network notifies the UE of no response, and save the power consumption of the UE due to frequent initiation of the TAU.

[0140] Referring to FIG. 7, an example of the embodiment shown in FIG. 6 is provided. According to FIG. 7, when the UE is in the second state, if the second condition corresponding to the any cell selection state is met, the UE can enter the first state, for example, enter the any cell selection state. Alternatively, when the UE is in the second state, if the second condition corresponding to the camped normally state is met, the UE can enter the first state, for example, enter the camped normally state.

[0141] The embodiment of the present application provides a new state, for example, the second state, for the UE. In the second state, the UE can detect the alert signal. In other words, the embodiment of the present application provides a state that can support the alert state, so that the alert signal can be applied, and the probability of successful paging of the UE is improved. Moreover, the second state and the first state can also be converted to each other, and the UE can enter different states in different situations, so as to adapt to the working condition of the UE.

[0142] In the embodiment of the present application, the first state is, for example, the camped normally state, the camped on any cell state, or the any cell selection state. For example, no matter which state the first state is, the UE in the second state can enter the first state through the second condition, that is, the embodiment of the present application can support entering the camped normally state from the second state, or support entering the camped on any cell state from the second state, or support entering the any cell selection state from the second state.

[0143] Alternatively, embodiments of the present application can only support the transition between certain or several first states and the second state. For example, embodiments of the present application only support the transition from the second state to the camped normally state, but do not support the transition from the second state to the camped on any cell state, nor the transition from the second state to the any cell selection state. For another example, embodiments of the present application only support the transition from the second state to the camped on any cell state, but do not support the transition from the second state to the camped normally state, nor the transition from the second state to the any cell selection state. For another example, embodiments of the present application only support the transition from the second state to the any cell selection state, but do not support the transition from the second state to the camped on any cell state, nor the transition from the second state to the camped normally state. For another example, embodiments of the present application support the transition from the second state to the camped normally state, and support the transition from the second state to the any cell selection state, but do not support the transition from the second state to the camped on any cell state.

[0144] If embodiments of the present application do not support the transition of the UE between the second state and a certain first state, the behavior of the UE in the first state can refer to the prior art, i.e., the behavior is not affected by embodiments of the present application, or is understood as not affected by the alert signal. For example, if embodiments of the present application support the transition from the second state to the camped normally state, and support the transition from the second state to the any cell selection state, but do not support the transition from the second state to the camped on any cell state, the behavior of the UE in the camped on any cell state can completely refer to the prior art.

[0145] The embodiment shown in FIG. 4 can be combined with the embodiment shown in FIG. 6. For example, the UE can enter the second state from the first state according to the embodiment shown in FIG. 4, and can enter the first state from the second state according to the embodiment shown in FIG. 6. For example, one solution of the combination of the embodiment shown in FIG. 4 and the embodiment shown in FIG. 6 includes that, in the scenario of entering the second state from the first state, the embodiment of the present application only supports entering the second state from the camped normally state, does not support entering the second state from the camped on any cell state, and does not support entering the second state from the any cell selection state; in the scenario of entering the first state from the second state, the embodiment of the present application supports entering the camped normally state from the second state, and supports entering the any cell selection state from the second state, but does not support entering the camped on any cell state from the second state.

[0146] For another example, another solution of the combination of the embodiment shown in FIG. 4 and the embodiment shown in FIG. 6 includes that, in the scenario of entering the second state from the first state, the embodiment of the present application only supports entering the second state from the camped normally state, does not support entering the second state from the camped on any cell state, and does not support entering the second state from the any cell selection state; in the scenario of entering the first state from the second state, the embodiment of the present application only supports entering the camped normally state from the second state, does not support entering the any cell selection state from the second state, and does not support entering the camped on any cell state from the second state.

[0147] Alternatively, the embodiment shown in FIG. 4 and the embodiment shown in FIG. 6 can not be combined, but are applied separately.

[0148] The embodiment of the present application provides another communication method. Please refer to FIG. 8, which is a flowchart of the method.

[0149] S801, the network device sends the second system information in the third cell. Correspondingly, the UE receives the second system information in the third cell.

[0150] The second system information can comprise configuration information of alert signals of the third cell and the at least one cell, for example, configuration information of the first synchronization signal. The first synchronization signal can refer to the embodiment shown in FIG. 4. The third cell and the at least one cell can be cells covering the first geographical area in sequence. The UE is located in the first geographical area. For example, the third cell covers the first geographical area first. After the satellite providing the third cell moves, the first geographical area changes to be covered by the fourth cell. After the satellite providing the fourth cell moves, the first geographical area changes to be covered by the fifth cell, and so on. The fourth cell and the fifth cell belong to the at least one cell. Optionally, the third cell and the at least one cell can belong to the same tracking area (TA). For example, the second system information can comprise configuration information of alert signals of part or all of the cells in the TA, for example, configuration information of the first synchronization signal.

[0151] Optionally, for the third cell and the at least one cell, the configuration information of the alert signals in different cells can be completely the same or partially the same. For example, the configuration information of the first synchronization signal in different cells is completely the same (for example, the configuration information of the first synchronization signal of all cells in the same TA is the same), for example, the first configuration information. The second system information can comprise the first configuration information. That is, the second system information comprises one piece of configuration information, and does not need to comprise the configuration information of the first synchronization signal in each cell. Alternatively, for the third cell and the at least one cell, the configuration information of the first synchronization signal in different cells can be the same or different (for example, the configuration information of the first synchronization signal of different cells in the same TA is the same or different). The second system information can comprise the configuration information of the first synchronization signal in each cell of the third cell and the at least one cell. The configuration information of the first synchronization signal in a cell can comprise, for example, a sequence corresponding to the first synchronization signal in the cell, and / or structure information of the first synchronization signal in the cell (for example, fields included in the first synchronization signal, etc.).

[0152] In a satellite scenario (e.g., a low earth orbit satellite scenario), since the satellite is in a moving state, the cells covering the same geographical area can also be moving. At time 1, the geographical area 1 can be covered by the cell 1; and at time 2, the geographical area 1 can be covered by the cell 2. For example, the UE is located in the geographical area 1, if the UE is in the second state (the second state can be referred to the embodiment shown in FIG. 4), after the cell changes, the UE needs to detect the alert signal (e.g., the first synchronization signal) in the new cell after the cell changes, so as to perform synchronization with the new cell to detect the alert message in the new cell. The embodiments of the present application make the second system information include the configuration information of the alert signal in the third cell and at least one cell, for example, the configuration information of the first synchronization signal, so that the UE can obtain the configuration information of the first synchronization signal in each cell covering the first geographical area. Thus, even if the cell covering the first geographical area changes, the UE can receive the first synchronization signal in the new cell according to the configuration information of the first synchronization signal, so as to realize synchronization with the network device.

[0153] Optionally, the second system information can further include the frequency domain information and / or time domain information of the first synchronization signal in the at least one cell. The frequency domain information and / or time domain information of the first synchronization signal in a cell can be used by the UE to detect the first synchronization signal in the cell.

[0154] Optionally, the second system information includes the frequency domain information of the first synchronization signal in any cell of the at least one cell, for example, the frequency of the first synchronization signal in the cell. For example, the at least one cell includes the cell 1, the cell 2, and the cell 3, and the second system information can include f1→f2→f3, f1 represents the frequency of the first synchronization signal in the cell 1, f2 represents the frequency of the first synchronization signal in the cell 2, and f3 represents the frequency of the first synchronization signal in the cell 3. The arrow represents the moving order of the cells, or represents the change order of the cells covering the first geographical area.

[0155] Alternatively, the second system information comprises frequency domain information of the first synchronization signal of any one of the at least one cell, which can also be a frequency offset between the frequency of the first synchronization signal of the cell and a reference frequency. Optionally, the reference frequency is, for example, the frequency of the third cell, or the frequency of the first synchronization signal of the third cell, or can also be other frequency. For example, the at least one cell comprises cell 1, cell 2, and cell 3, and the second system information can comprise frequency offset 1→ frequency offset 2→ frequency offset 3, where frequency offset 1 represents the frequency offset between the frequency of the first synchronization signal of cell 1 and a reference frequency, frequency offset 2 represents the frequency offset between the frequency of the first synchronization signal of cell 2 and the reference frequency, and frequency offset 3 represents the frequency offset between the frequency of the first synchronization signal of cell 3 and the reference frequency, and the arrow represents the moving order of the cells, or represents the changing order of the cells covering the first geographical area.

[0156] Alternatively, the second system information can also comprise a frequency pattern, which can embody the frequency domain information of the first synchronization signal of the at least one cell.

[0157] Alternatively, the second system information can not comprise the frequency domain information of the first synchronization signal of the at least one cell. For example, the second system information comprises first indication information, which can indicate that the frequency of the first synchronization signal of the third cell and the at least one cell is the same. Then, the UE can detect the first synchronization signal at the same frequency no matter in which cell of the third cell and the at least one cell, which can reduce the detection complexity of the UE. Moreover, since the second system information does not have to indicate the frequency domain information of the first synchronization signal of the at least one cell, the overhead of the second system information can also be reduced.

[0158] Optionally, the second system information comprises time domain information of the first synchronization signal of any one of the at least one cell, for example, the time variation information of the first synchronization signal of the cell. The variation of the first synchronization signal in time can be caused by the misalignment of the frame numbers between satellites or cells, or by the different resource locations of the first synchronization signal. Therefore, the second system information can provide the time variation information of the first synchronization signal of different cells, so that the UE can determine the time domain location of the first synchronization signal in the new cell.

[0159] Optionally, the second system information includes time domain information of the first synchronization signal of any one of the at least one cell, for example, time information of the first synchronization signal in the cell. For example, the at least one cell includes cell 1, cell 2, and cell 3, and the second system information can include t1→t2→t3, t1 represents time of the first synchronization signal in cell 1, t2 represents time of the first synchronization signal in cell 2, and t3 represents time of the first synchronization signal in cell 3, and the arrow represents the moving order of the cells or the order of the cells covering the first geographical area.

[0160] Alternatively, the second system information includes time domain information of the first synchronization signal of any one of the at least one cell, which can also be the time offset between the time of the first synchronization signal in the cell and a reference time. Optionally, the reference time is, for example, the time of the first synchronization signal in a third cell, or the time of a system frame corresponding to a system frame number (SFN), or other time. Optionally, the unit of the time offset can be frame, facilitating the UE to determine the frame boundary of the new cell. For example, the at least one cell includes cell 1, cell 2, and cell 3, and the second system information can include timeoffset1→timeoffset2→timeoffset3, timeoffset1 represents the time offset between the time of the first synchronization signal in cell 1 and the reference time, timeoffset2 represents the time offset between the time of the first synchronization signal in cell 2 and the reference time, and timeoffset3 represents the time offset between the time of the first synchronization signal in cell 3 and the reference time, and the arrow represents the moving order of the cells or the order of the cells covering the first geographical area.

[0161] Alternatively, the time domain information of the first synchronization signal of any one of the at least one cell included in the second system information can also be a range of time offset between the time of the first synchronization signal in the cell and the reference time, which can be referred to as a time offset range or a time window or a measurement window, etc. Optionally, the time offset range can include at least one time offset, which can be continuous or discontinuous in the time domain. The unit of the time offset can be frame, which is convenient for the UE to determine the frame boundary of the new cell. For example, the at least one cell includes cell 1, cell 2 and cell 3, and the second system information can include time offset range 1→time offset range 2→time offset range 3, time offset range 1 represents the range of time offset between the time of the first synchronization signal in cell 1 and the reference time, time offset range 2 represents the range of time offset between the time of the first synchronization signal in cell 2 and the reference time, and time offset range 3 represents the range of time offset between the time of the first synchronization signal in cell 3 and the reference time. The arrow represents the moving order of the cells or the changing order of the cells covering the first geographical area. If the second system information includes the time offset range, the UE in the new cell can determine the time domain position of the first synchronization signal according to part or all of the time offset in the time offset range corresponding to the new cell.

[0162] Optionally, the UE can be in the first state when receiving the second system information, and the first state is, for example, camped normally state or camped on any cell state.

[0163] S802, when the third condition is met, the UE detects the first synchronization signal in the fourth cell. The fourth cell belongs to the at least one cell.

[0164] For example, after receiving the second system information, the UE enters the second state, and the UE can perform S802 in the second state. The second state can be introduced with reference to the embodiment shown in FIG. 4.

[0165] Optionally, after entering the second state, the UE can receive third system information. For example, the network device sends the third system information in the third cell, and the UE receives the third system information in the third cell. This step can be referred to as S803. S803 can occur before S802, for example. The third system information is, for example, system information that the UE can receive in the second state. The second system information corresponds to the first state, and the UE can not be able to receive the second system information in the second state. To this end, the embodiments of the present application provide the third system information, which corresponds to the second state, so that the UE can also receive system information in the second state. The third system information can assist the UE in performing synchronization with the network device in the second state. Optionally, the third system information can be sent through an alert signal, for example, included in an alert message or included in the first synchronization signal.

[0166] Optionally, the third system information can include one or more of the following: TA identification information, configuration information of the alert signal in at least one cell (for example, configuration information of the first synchronization signal), time domain information of the first synchronization signal in at least one cell, or frequency domain information of the first synchronization signal in at least one cell. For the features of the configuration information, the time domain information, and the frequency domain information of the first synchronization signal, refer to the foregoing.

[0167] For example, the third system information can include TA identification information, which includes, for example, a TAC and / or an index of the TA, to help the UE determine the TA in which the UE currently resides. When the UE moves out of the TA in which the UE currently resides, the UE can also identify whether TAU is needed for communication with the network.

[0168] For example, if the second system information includes the related information (for example, one or more of the configuration information, the time domain information, or the frequency domain information) of the first synchronization signal in at least one cell, the third system information can not include the related information of the first synchronization signal in at least one cell, or the network device can not send the third system information. Alternatively, if the third system information includes the related information of the first synchronization signal in at least one cell, the second system information can not include the related information of the first synchronization signal in at least one cell, or the network device can not send the second system information. Therefore, S801 and S803 are optional steps.

[0169] Alternatively, the second system information includes the related information (e.g., one or more of configuration information, time domain information, or frequency domain information, or multiple sets of configurations) of the first synchronization signal in at least one cell, and the third system information can indicate the index of the configuration used by the current network device to assist the UE to determine the currently used configuration. In this regard, S801 and S803 can be used in combination or separately. In this regard, S801 and S803 are both optional steps.

[0170] In addition, if the third system information includes the related information of the first synchronization signal in all cells in the at least one cell, the network device can only send the third system information in one cell (e.g., the third cell), and the third system information can no longer be sent in the at least one cell. Alternatively, if the third system information includes the related information of the first synchronization signal in part of the cells in the at least one cell, the network device can send the third system information in part or all of the cells in the at least one cell in addition to the third cell. For example, the third system information sent by the network device in one cell can include the related information of the first synchronization signal in the next cell of the cell. The next cell of the cell can refer to the next cell covering the first geographic area after the cell.

[0171] The UE originally detects the first synchronization signal in the third cell. When the third condition is met, the UE can detect the first synchronization signal according to the related information of the first synchronization signal in the next cell indicated by the first system information (e.g., the first system information is the second system information and / or the third system information). The next cell refers to the next cell covering the first geographic area after the third cell, e.g., the fourth cell, which belongs to the at least one cell.

[0172] If the UE is in the first state, the UE can perform a cell reselection or the like, i.e., the UE can perceive the change of the cell, and the UE can detect the first synchronization signal in the fourth cell according to the first system information when the cell changes, and the third condition at this time includes the change of the cell or the UE reselects to the fourth cell, for example. But for the UE in the second state, the UE can not perform the cell reselection or the like, and thus the UE can not perceive the change of the cell, or does not need to perceive the change of the cell, or does not need to know the information of the cell after the change. Therefore, the third condition is provided in the embodiments of the present application, and the UE can detect the first synchronization signal based on the judgment of the third condition. When the third condition is met, the UE can detect the first synchronization signal according to the related information of the first synchronization signal in the next cell indicated by the first system information, but at this time, the UE can not perceive the change of the cell, or does not need to perceive the information of the cell after the change. Therefore, S802 can also be replaced by that the UE detects the first synchronization signal according to the first system information when the third condition is met. That is, the UE can not perceive in which cell the first synchronization signal is detected, but only performs the detection according to the first system information.

[0173] Optionally, the third condition can include one or more of the following: determining, according to the Doppler information of the third cell, that the distance between the satellite corresponding to the third cell and the UE is greater than or equal to a fifth threshold; or, determining, according to the ephemeris information of the satellite corresponding to the third cell and the position information of the UE, that the distance between the satellite and the UE is greater than or equal to the fifth threshold; or, the measurement result of the first synchronization signal in the third cell is less than or equal to a sixth threshold; or, the UE periodically detects the first synchronization signal according to the indication of the first system information.

[0174] For example, the UE can determine whether the satellite corresponding to the third cell has moved away from the UE according to the Doppler information corresponding to the first synchronization signal received in the third cell. The Doppler information includes a Doppler frequency offset, for example, and the Doppler frequency offset can correspond to the distance, so the UE can determine the distance between the satellite corresponding to the third cell and the UE according to the Doppler offset. If the distance is greater than or equal to the fifth threshold, the quality of the first synchronization signal received by the UE in the third cell can be poor, or the first synchronization signal can not be received, and thus the UE can detect the first synchronization signal in the next cell (e.g., the fourth cell) according to the first system information. The fifth threshold can be configured by the network device, or predefined by the protocol, or preconfigured in the UE. If configured by the network device, the network device can configure the fifth threshold through system information or other messages, for example.

[0175] For example, the UE has obtained the ephemeris information of the satellite corresponding to the third cell, the UE can determine whether the satellite corresponding to the third cell has moved away from the UE according to the ephemeris information and the location information of the UE. The ephemeris information indicates the correspondence between the location of the satellite and time, for example, the UE can determine the location of the satellite at a certain time according to the ephemeris information. In addition, the UE can determine the location information of the UE through positioning, so that the UE can determine the distance between the satellite and the UE according to the location of the satellite and the location of the UE. If the distance is greater than or equal to the fifth threshold, the quality of the first synchronization signal received by the UE in the third cell can be poor, or the first synchronization signal can not be received, so the UE can detect the first synchronization signal in the next cell (for example, the fourth cell) according to the first system information.

[0176] For example, if the measurement result of the UE on the first synchronization signal in the third cell is poor, for example, less than or equal to the sixth threshold, it indicates that the UE cannot obtain a first synchronization signal with good quality in the third cell, so the UE can detect the first synchronization signal in the nearby cell (for example, the fourth cell) according to the first system information to improve the reception quality of the first synchronization signal. The sixth threshold can be configured by the network device, or predefined by the protocol, or preconfigured in the UE. If it is configured by the network device, for example, the network device can configure the sixth threshold through system information or other messages.

[0177] For example, the UE can periodically detect the first synchronization signal according to the indication of the first system information. If the signal quality of the first synchronization signal detected by the UE is good, the UE can receive the first system information corresponding to the first synchronization signal, so as to obtain the information of other first synchronization signals.

[0178] Alternatively, the UE can not need to determine the third condition, that is, the UE can not perform S802, but perform blind detection. For example, the UE can perform blind detection in the first frequency range, which can be predefined by the protocol, or configured by the network device, or determined by the UE itself (for example, according to the capability of the UE and other factors). If the first synchronization signal is searched through blind detection, the UE can perform synchronization with the network device according to the first synchronization signal.

[0179] In the embodiments of the present application, the configuration information of the first synchronization signal of all cells in the same TA can be the same. In this scheme, if the UE detects that the first synchronization signal has changed, or the UE receives the third system information carrying the TA information through the alert signal, the UE can determine that the TA has changed. For example, the UE receives the first synchronization signal, if the sequence corresponding to the first synchronization signal is the same as the sequence corresponding to the first synchronization signal received by the UE in the last cell, or the sequence corresponding to the first synchronization signal is the same as the sequence corresponding to the first synchronization signal in the TA corresponding to the UE originally, the UE determines that the TA has not changed, or determines that the UE has not moved out of the TA originally corresponding to the UE; or, if the sequence corresponding to the first synchronization signal is different from the sequence corresponding to the first synchronization signal received by the UE in the last cell, or the sequence corresponding to the first synchronization signal is different from the sequence corresponding to the first synchronization signal in the TA corresponding to the UE originally, the UE determines that the TA has changed, or determines that the UE has moved out of the TA originally corresponding to the UE.

[0180] For another example, the UE receives the first synchronization signal, and the first synchronization signal can carry indication information A, which can indicate the TA corresponding to the first synchronization signal. If the TA corresponding to the first synchronization signal is the TA originally corresponding to the UE, the UE determines that the TA has not changed, or determines that the UE has not moved out of the TA originally corresponding to the UE; or, if the TA corresponding to the first synchronization signal is not the TA originally corresponding to the UE, the UE determines that the TA has changed, or determines that the UE has moved out of the TA originally corresponding to the UE. Optionally, the indication information A includes a tracking area code (TAC), which can indicate the TA corresponding to the first synchronization signal.

[0181] For another example, the UE receives the third system information, and the third system information includes TA information, for example, carries indication information A, and the description of the indication information A can be referred to the above. If the TA information does not correspond to (for example, is not the same as) the TA information stored by the UE, the UE can determine that the TA has changed; or, if the TA information corresponds to (for example, is the same as) the TA information stored by the UE, the UE can determine that the TA has not changed.

[0182] If the UE determines that the UE has moved out of the TA originally corresponding to the UE, or determines that the TA has changed, the UE can output prompt information. For example, the UE can output the prompt information through a ring and / or a user interface (UI), and the prompt information can prompt the user to align the UE with the satellite. If the user aligns the UE with the satellite, the channel condition between the UE and the network device can be better. Optionally, the UE can enter the camped normally state and communicate normally with the network device.

[0183] In the embodiments of the present application, the configuration information of the first synchronization signal of each cell in the same TA can be the same, so that even if the cell changes, the UE can detect the first synchronization signal according to the configuration information of the first synchronization signal in the original cell in the new cell, thereby synchronizing with the network device to normally use the alert-related service. Moreover, the third condition provided in the embodiments of the present application enables the UE in the second state to determine the change of the cell even if the cell reselection is not performed, so that the first synchronization signal in the new cell can be detected in time.

[0184] The embodiments shown in FIG. 8 can be applied in combination with the embodiments shown in FIG. 4. For example, in the embodiments shown in FIG. 8, the UE enters the second state, for example, the UE can enter the second state from the first state according to the method provided in the embodiments shown in FIG. 4. Alternatively, the embodiments shown in FIG. 8 can not be combined with the embodiments shown in FIG. 4, but are applied independently, and in the embodiments shown in FIG. 8, the UE can enter the second state in other manners.

[0185] The embodiments shown in FIG. 8 can be applied in combination with the embodiments shown in FIG. 6. For example, in the embodiments shown in FIG. 8, the UE can be in the first state when receiving the second system information, for example, the UE can enter the first state from the second state and receive the second system information in the first state according to the method provided in the embodiments shown in FIG. 6. For another example, the embodiments shown in FIG. 8 mention that the UE enters the second state, and optionally, the UE can also enter the first state from the second state, for example, the UE can enter the first state from the second state according to the method provided in the embodiments shown in FIG. 6. Alternatively, the embodiments shown in FIG. 8 can not be combined with the embodiments shown in FIG. 6, but are applied independently, and in the embodiments shown in FIG. 8, the UE can enter the first state or the second state in other manners.

[0186] FIG. 9 shows a structural schematic diagram of an apparatus provided in the embodiments of the present application. The communication apparatus 900 can be the UE or the circuitry of the UE in the embodiments shown in any one of FIG. 4, FIG. 6, or FIG. 8, for implementing the method corresponding to the UE in the above method embodiments. Alternatively, the communication apparatus 900 can be the network device or the circuitry of the network device in the embodiments shown in any one of FIG. 4, FIG. 6, or FIG. 8, for implementing the method corresponding to the network device in the above method embodiments. For example, one of the circuitry can be a chip system.

[0187] The communication apparatus 900 includes at least one processor 901. The processor 901 can be configured to perform internal processing of the apparatus, and implement certain control processing functions. Optionally, the processor 901 includes instructions. Optionally, the processor 901 can store data. Optionally, different processors can be independent devices, can be located at different physical locations, and can be located on different integrated circuits. Optionally, different processors can be integrated in one or more processors, for example, integrated on one or more integrated circuits.

[0188] Optionally, the communication apparatus 900 includes one or more memories 903 configured to store instructions. Optionally, the memories 903 can also store data. The processor and the memory can be separately arranged, or integrated together.

[0189] Optionally, the communication apparatus 900 includes a communication line 902 and at least one communication interface 904. Since the memory 903, the communication line 902 and the communication interface 904 are optional, they are all represented by dashed lines in FIG. 9.

[0190] Optionally, the communication apparatus 900 can also include a transceiver and / or an antenna. The transceiver can be configured to send information to other apparatuses or receive information from other apparatuses. The transceiver can be referred to as a transceiver, a transceiver circuit, an input / output interface, etc., and is configured to realize the transceiving function of the communication apparatus 900 through the antenna. Optionally, the transceiver includes a transmitter and a receiver. Illustratively, the transmitter can be configured to generate a radio frequency signal from a baseband signal, and the receiver can be configured to convert a radio frequency signal into a baseband signal.

[0191] The processor 901 can include a general central processing unit (CPU), a microprocessor, an application specific integrated circuit (ASIC), or one or more integrated circuits configured to control the execution of programs of the solutions of the present application.

[0192] The communication line 902 can include a path for transmitting information between the above-mentioned components.

[0193] The communication interface 904 uses any transceiver-like device for communicating with other devices or communication networks, such as an Ethernet, a radio access network (RAN), a wireless local area networks (WLAN), a wired access network, etc.

[0194] The memory 903 can be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), or other type of dynamic storage device that can store information and instructions for execution by the processor 901, and can be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM), or other optical disc storage, a magnetic disk storage or other magnetic storage devices, or any other medium capable of storing instructions or data that can be accessed by a computer, but is not limited to this. The memory 903 can exist independently, and be connected to the processor 901 through the communication line 902. Alternatively, the memory 903 can be integrated with the processor 901.

[0195] The memory 903 is configured to store computer-executable instructions for implementing the solutions of the present application, and the processor 901 is configured to control the execution of the computer-executable instructions stored in the memory 903. The processor 901 is configured to execute the steps performed by the network device or the UE in the embodiments shown in any one of FIG. 4, FIG. 6, or FIG. 8, by executing the computer-executable instructions stored in the memory 903.

[0196] Optionally, the computer-executable instructions in the embodiments of the present application can also be referred to as application program codes, and the embodiments of the present application are not limited in this regard.

[0197] In a specific implementation, as an example, the processor 901 can include one or more CPUs, such as CPU0 and CPU1 in FIG. 9.

[0198] In a specific implementation, as an example, the communication apparatus 900 can include multiple processors, such as the processor 901 and the processor 905 in FIG. 9. Each of these processors can be a single-CPU processor or a multi-CPU processor. The processor herein can refer to one or more devices, circuits, and / or processing cores for processing data (for example, computer program instructions).

[0199] When the apparatus shown in FIG. 9 is a chip, for example, a chip of a UE or a chip of a network device, the chip includes the processor 901 (and can also include the processor 905), the communication line 902, and the communication interface 904, and optionally, the chip can include the memory 903. Specifically, the communication interface 904 can be an input interface, a pin, or a circuit, etc. The memory 903 can be a register, a cache, etc. The processor 901 and the processor 905 can be a general-purpose CPU, a microprocessor, an ASIC, or one or more integrated circuits for executing programs for controlling the communication method of any of the above embodiments.

[0200] The embodiments of the present application can divide the functions of the apparatus according to the above method examples, for example, each function module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be realized in the form of hardware or in the form of a software function module. In the embodiments of the present application, the division of the module is illustrative and is only a logical function division. In actual implementation, another division manner can be used. For example, in the case of dividing each function module according to each function, FIG. 10 is a schematic diagram of an apparatus 1000. The apparatus 1000 can be a UE or a network device involved in each of the above method embodiments, or a chip in the UE or a chip in the network device. The apparatus 1000 includes a processing unit 1002 and a transceiver unit 1001.

[0201] It should be understood that the apparatus 1000 can be used to implement the steps performed by the UE or the network device in the communication method of the embodiments of the present application. The related features can be referred to the embodiments shown in any of FIG. 4, FIG. 6, or FIG. 8, which will not be described herein again.

[0202] Optionally, the functions / implementation processes of the transceiver unit 1001 and the processing unit 1002 in FIG. 10 can be realized by the processor 901 in FIG. 9 invoking computer-executable instructions stored in the memory 903. Alternatively, the functions / implementation processes of the processing unit 1002 in FIG. 10 can be realized by the processor 901 in FIG. 9 invoking computer-executable instructions stored in the memory 903, and the functions / implementation processes of the transceiver unit 1001 in FIG. 10 can be realized by the communication interface 904 in FIG. 9.

[0203] Optionally, when the apparatus 1000 is a chip or a circuit, the functions / implementation processes of the transceiver unit 1001 can also be realized by a pin or a circuit, etc. Optionally, the transceiver unit 1001 can include a sending unit and / or a receiving unit, the sending unit is used to realize the sending function, and the receiving unit is used to realize the receiving function; or the transceiver unit 1001 can be an integral module, which can realize the sending function and / or the receiving function. Optionally, the transceiver unit 1001 can be realized by a transceiver.

[0204] The application further provides a computer readable storage medium storing a computer program or instructions, which, when executed, implement the method performed by the UE or the network device in the foregoing method embodiments. Thus, the functions described in the foregoing embodiments can be implemented in the form of software function units and sold or used as independent products. Based on this understanding, the technical solutions of the application can essentially or in part be embodied in the form of a software product and stored in a storage medium, including a plurality of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the application. The storage medium includes a U disk, a mobile hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, and various other media that can store program codes.

[0205] The application further provides a computer program product, which includes computer program codes, which, when executed on a computer, cause the computer to perform the method performed by the UE or the network device in any of the foregoing method embodiments.

[0206] The embodiments of the application further provide a processing device, including a processor and an interface; the processor is configured to execute the method performed by the UE or the network device related to any of the foregoing method embodiments.

[0207] In the embodiments described above, all or some of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or some of the embodiments can be implemented by one or more computer program products. The computer program product includes one or more computer instructions. When loaded and executed by a computer, the computer program instructions cause the computer to perform all or some of the processes or functions described in the embodiments of the present application. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatuses. The computer instructions can be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another computer readable storage medium, for example, the computer instructions can be transmitted from one website site, computer, server or data center to another website site, computer, server or data center through wired (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) manner. The computer readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media sets. The available medium can be a magnetic medium (for example, floppy disk, hard disk, magnetic tape), an optical medium (for example, DVD), or a semiconductor medium (for example, solid state disk (SSD)) and the like.

[0208] The various illustrative logical blocks, modules, circuits, and algorithms described in connection with the embodiments disclosed herein can be implemented or performed by a general purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processor can be a microprocessor, optionally, the general purpose processor can also be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented by a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

[0209] The steps of methods or algorithms described in the embodiments of the present application can be directly embedded in hardware, a software unit executed by a processor, or a combination of the two. The software unit can be stored in a RAM, a flash memory, a ROM, an erasable programmable read-only memory (EPROM), an EEPROM, a register, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium in the art. The storage medium can be connected to the processor, so that the processor can read information from the storage medium and write information to the storage medium. Alternatively, the storage medium can also be integrated into the processor. The processor and the storage medium can be located in an ASIC, which can be located in the terminal device. Alternatively, the processor and the storage medium can also be located in different components of the terminal device.

[0210] These computer program instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operations to be performed on the computer or other programmable data processing device to generate a computer implemented process, so that the instructions executed on the computer or other programmable data processing device provide steps for implementing the functions specified in one or more flows of the flowchart and / or one or more blocks of the block diagram.

[0211] The contents of various embodiments of the present application can be mutually referred to, and the terms and / or descriptions between different embodiments are consistent and can be mutually referred to if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0212] It can be understood that, in the embodiments of the present application, the UE and / or the network device can perform part or all of the steps in the embodiments of the present application, and these steps or operations are only examples, and other operations or variations of various operations can also be performed in the embodiments of the present application. In addition, each step can be performed in a different order from that presented in the embodiments of the present application, and it is possible that not all the operations in the embodiments of the present application are performed.

Claims

1. A communication method characterized by comprising: The method comprises: in a first state, determining that a first condition is met, the first state being a camped normal state, or a camped arbitrary cell state, or an arbitrary cell selection state; entering a second state, wherein in the second state, the terminal is capable of detecting a first synchronization signal and an alarm signal, the first synchronization signal being used for the terminal to synchronize with a network device in the second state, and the alarm signal being used to prompt a missed service or arrival of a service.

2. The method of claim 1, wherein, The method further comprises, in the second state, performing one or more of the following: not detecting a second synchronization signal, the second synchronization signal being used for the terminal to synchronize with the network device in the camped normal state or the camped arbitrary cell state; not detecting a paging message; not detecting a short message; not detecting system information; not performing cell reselection; or periodically performing cell reselection evaluation.

3. The method according to claim 1 or 2, characterized in that, The first state is the camped normal state, wherein the first condition comprises: a measurement result for a first cell being less than or equal to a first threshold, the first cell being a cell in which the terminal camps; and / or a measurement result for the first synchronization signal being greater than or equal to a second threshold.

4. The method according to claim 1 or 2, characterized in that, The first state is the camped arbitrary cell state or the arbitrary cell selection state, wherein the first condition comprises: detecting system information from a second cell and not meeting a camp condition of the second cell, and detecting the first synchronization signal according to first configuration information included in the system information and a measurement result for the first synchronization signal being greater than or equal to a second threshold; or detecting the first synchronization signal according to predefined first configuration information and a measurement result for the first synchronization signal being greater than or equal to a second threshold.

5. A communication method characterized by comprising: The method comprises: in a second state, determining that a second condition is met, wherein in the second state, the terminal is capable of detecting a first synchronization signal and an alarm signal, the first synchronization signal being used for the terminal to synchronize with a network device in the second state, and the alarm signal being used to prompt a missed service or arrival of a service; entering a first state, the first state being a camped normal state, or a camped arbitrary cell state, or an arbitrary cell selection state.

6. The method of claim 5, wherein, The method further comprises, in the second state, performing one or more of the following: not detecting a second synchronization signal, the second synchronization signal being used for the terminal to synchronize with the network device in the camped normal state or the camped arbitrary cell state; not detecting a paging message; not detecting a short message; not detecting system information; not performing cell reselection; or periodically performing cell reselection evaluation.

7. The method according to claim 5 or 6, characterized in that, The first state is the camped normal state, wherein the second condition comprises: periodically performing cell reselection evaluation and searching for a suitable cell in the cell reselection evaluation process; or a measurement result for the first synchronization signal being greater than or equal to a third threshold, triggering cell reselection evaluation, and searching for a suitable cell in the cell reselection evaluation process.

8. The method according to claim 5 or 6, characterized in that, The first state is the arbitrary cell selection state, wherein the second condition comprises: a measurement result for the first synchronization signal being less than or equal to a fourth threshold.

9. A communication method characterized by comprising: The method comprises: receiving first system information in a third cell, the first system information comprising configuration information of first synchronization signals of the third cell and at least one cell, wherein the third cell covers a first geographical area, the at least one cell is a cell covering the first geographical area after the third cell, and the first synchronization signals are used for synchronization between a terminal and a network device in a second state, in which the terminal can detect the first synchronization signals and an alarm signal used for prompting a missed service or arrival of a service; when a third condition is met, detecting the first synchronization signals in a fourth cell according to the first system information, the fourth cell belonging to the at least one cell.

10. The method of claim 9, wherein, The third cell and the at least one cell belong to a same tracking area.

11. The method according to claim 9 or 10, characterized in that, The first system information comprises configuration information of the first synchronization signals of the third cell and the at least one cell, comprising: The first system information comprises first configuration information, wherein the configuration information of the first synchronization signals of the third cell and the at least one cell is the same and is the first configuration information.

12. The method according to any one of claims 9 to 11, characterized in that, The first system information further comprises time domain information and / or frequency domain information of the first synchronization signals of the at least one cell.

13. The method according to any one of claims 9 to 12, characterized in that, receiving first system information in a third cell, comprising: receiving the first system information in the third cell in a first state, the first state being a camped normal state or a camped anywhere state; or receiving the first system information in the third cell in a second state.

14. The method according to any one of claims 9 to 13, characterized in that, The third condition comprises one or more of the following: determining, according to Doppler information of the third cell, that a distance between a satellite corresponding to the third cell and the terminal is greater than or equal to a fifth threshold; determining, according to ephemeris information of the satellite corresponding to the third cell and position information of the terminal, that a distance between the satellite and the terminal is greater than or equal to a fifth threshold; or a measurement result of the first synchronization signals in the third cell is less than or equal to a sixth threshold. The method comprises:

15. A method of communication, comprising: sending first system information in a third cell, the first system information comprising configuration information of first synchronization signals of the third cell and at least one cell, wherein the third cell covers a first geographical area, the at least one cell is a cell covering the first geographical area after the third cell, and the first synchronization signals are used for synchronization between a terminal and a network device in a second state, in which the terminal can detect the first synchronization signals and an alarm signal used for prompting a missed service or arrival of a service. The third cell and the at least one cell belong to a same tracking area.

16. The method of claim 15, wherein, The first system information comprises configuration information of the first synchronization signals of the third cell and the at least one cell, comprising:

17. The method according to claim 15 or 16, characterized in that, The first system information comprises first configuration information, wherein the configuration information of the first synchronization signals of the third cell and the at least one cell is the same and is the first configuration information. ​ 18. The method according to any one of claims 15 to 17, characterized in that, The first system information further comprises time domain information and / or frequency domain information of the first synchronization signal of the at least one cell.

19. The method according to any one of claims 15 to 18, characterized in that, The first system information is transmitted by a third cell, comprising: The first system information corresponding to the first state of the terminal is transmitted by the third cell, the first state being a camped normal state, or a camped arbitrary cell state; or The first system information corresponding to the second state is transmitted by the third cell.

20. An apparatus comprising: The apparatus comprises a module for performing the method of any one of claims 1-4, or a module for performing the method of any one of claims 5-8, or a module for performing the method of any one of claims 9-14, or a module for performing the method of any one of claims 15-19.

21. An apparatus, comprising: The apparatus comprises a processor for performing the method of any one of claims 1-4, or performing the method of any one of claims 5-8, or performing the method of any one of claims 9-14, or performing the method of any one of claims 15-19.

22. A computer-readable storage medium, characterized in that, The computer readable storage medium is configured to store a computer program, which, when executed on a computer, causes the method of any one of claims 1-4 to be performed, or causes the method of any one of claims 5-8 to be performed, or causes the method of any one of claims 9-14 to be performed, or causes the method of any one of claims 15-19 to be performed.

23. A computer program product, characterised in that, The computer program product comprises a computer program, which, when executed on a computer, causes the computer to perform the method of any one of claims 1-4, or causes the computer to perform the method of any one of claims 5-8, or causes the computer to perform the method of any one of claims 9-14, or causes the computer to perform the method of any one of claims 15-19.

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