Information acquisition method and apparatus, information sending method and apparatus, and communication system

Abstract

Provided in the present application are an information acquisition method and apparatus, an information sending method and apparatus, and a communication system. The information acquisition method comprises: a terminal device receives first indication information related to a change of system information of a first cell, and / or returns to the first cell, and / or reselects to the first cell; and the terminal device acquires on the first cell a system information block type 1 (on-demand SIB1) of the first cell.

Description

Information acquisition methods, information transmission methods, devices and communication systems Technical Field

[0001] The embodiments of this application relate to the field of wireless communication technology. Background Technology

[0002] In the standardized 5G network developed under the 3rd Generation Partnership Project (3GPP), a large number of NR (New Radio) base stations have been deployed. NR base stations need to operate with a large bandwidth (e.g., 100MHz), require a large number of ports (64T / 64R), and have a shorter TTI (1ms). The energy consumption of NR base stations in baseband processing, digital front-end, and other functions is significantly higher than that of LTE base stations.

[0003] According to operator statistics, the average energy consumption of an NR base station is more than three times that of an LTE base station. Electricity costs account for nearly half of the cost of deploying 5G networks. More importantly, NR base stations still consume a significant amount of energy even during periods without service traffic. This is because NR base stations still need to transmit common signals, such as the Synchronization Singular Block (SSB), System Information Block (SIB, e.g., SIB1), System Information (SI), and paging, significantly reducing their energy efficiency. Energy saving in NR networks is a pressing issue that needs to be addressed. Furthermore, energy saving will also be a crucial problem to solve in future networks (such as 6G and beyond).

[0004] It should be noted that the above introduction to the technical background is only for the purpose of providing a clear and complete explanation of the technical solutions of this application and facilitating understanding by those skilled in the art. It should not be assumed that these technical solutions are known to those skilled in the art simply because they have been described in the background section of this application.

[0005] Summary of the Invention

[0006] The inventors discovered that the research procedures and signaling methods in 3GPP Release 19 support on-demand System Information Block Type 1 (SIB1) for terminal devices in idle or inactive modes. Therefore, cells that support or use on-demand SIB1, unlike traditional cells, have emerged. However, it is currently unclear how a terminal device obtains the on-demand SIB1 of a cell when the system information of a cell supporting or using on-demand SIB1 changes, or when it needs to re-acquire the system information of that cell.

[0007] To address the aforementioned or other similar problems, embodiments of this application provide an information acquisition method, an information transmission method, an apparatus, and a communication system.

[0008] According to one aspect of the embodiments of this application, an information acquisition device is provided, applied / configured on a terminal device, the device comprising:

[0009] The first processing unit is configured to receive first indication information related to a change in system information of the first cell, and / or return to the first cell, and / or reselect to the first cell;

[0010] The first acquisition unit is used by the terminal device to acquire the system information block type one (on-demand SIB1) of the first cell.

[0011] According to another aspect of the embodiments of this application, an information transmitting apparatus is provided, applied / configured in a network device, the apparatus comprising:

[0012] The second sending unit is used to send to the terminal device first indication information related to the system information change of the first cell, and system information block type one (on-demand SIB1) of the first cell.

[0013] According to another aspect of the embodiments of this application, an information acquisition method is provided, applied to a terminal device, the method comprising:

[0014] The terminal device receives a first indication related to a change in system information of the first cell, and / or returns to the first cell, and / or reselects to the first cell;

[0015] The terminal device obtains the system information block type one (on-demand SIB1) of the first cell.

[0016] According to another aspect of the embodiments of this application, an information transmission method is provided, applied to a network device, the method comprising:

[0017] The network device sends a first indication message related to the change of system information of the first cell, and the first cell's system information block type one (on-demand SIB1) to the terminal device.

[0018] According to another aspect of the embodiments of this application, a terminal device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to implement the above-described information acquisition method on the terminal device side.

[0019] According to another aspect of the embodiments of this application, a network device is provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to execute the computer program to implement the above-described information transmission method on the network device side.

[0020] According to another aspect of the embodiments of this application, a communication system is provided, comprising:

[0021] A network device configured to perform the aforementioned information transmission method on the network device side;

[0022] A terminal device, which is configured to execute the aforementioned terminal device-side information acquisition method.

[0023] The beneficial effects of the embodiments of this application include:

[0024] The terminal device receives a first indication message related to a change in system information of the first cell, and / or returns to the first cell, and / or reselects to the first cell. Thus, when the terminal device receives the first indication message and / or returns to the first cell and / or reselects to the first cell, it can obtain the system information block type one (on-demand SIB1) of the first cell. This helps the terminal device obtain the on-demand SIB1 of the first cell at the correct time, enabling the terminal device and the first cell to have consistent system information. This avoids the terminal device failing to receive public information of the first cell or failing to access the first cell due to inconsistent system information.

[0025] Specific embodiments of this application are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of this application can be adopted. It should be understood that the embodiments of this application are not limited in scope. Within the scope of the appended claims, embodiments of this application include many changes, modifications, and equivalents.

[0026] Features described and / or illustrated for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments.

[0027] It should be emphasized that the term "including / comprises" as used herein refers to the presence of a feature, whole, step, or component, but does not exclude the presence or addition of one or more other features, wholes, steps, or components. Attached Figure Description

[0028] The elements and features described in one drawing or embodiment of this application may be combined with elements and features shown in one or more other drawings or embodiments. Furthermore, in the drawings, similar reference numerals denote corresponding parts in several drawings and can be used to indicate corresponding parts used in more than one embodiment.

[0029] The accompanying drawings, which form part of the specification, are used to provide a further understanding of the embodiments of this application and illustrate the implementation methods of this application, together with the textual description, to explain the principles of this application. Obviously, the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings:

[0030] Figure 1 is a schematic diagram of a communication system according to an embodiment of this application;

[0031] Figure 2 is a deployment scenario of an NES cell according to an embodiment of this application;

[0032] Figure 3 is a scenario of on-demand SIB1 according to an embodiment of this application;

[0033] Figure 4 is a schematic diagram of an information acquisition method according to an embodiment of this application;

[0034] Figure 5 is a schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0035] Figure 6 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0036] Figure 7 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0037] Figure 8 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0038] Figure 9 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0039] Figure 10 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0040] Figure 11 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0041] Figure 12 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application;

[0042] Figure 13 is a schematic diagram of an information sending method according to an embodiment of this application;

[0043] Figure 14 is a schematic diagram of an information acquisition device according to an embodiment of this application;

[0044] Figure 15 is a schematic diagram of an information transmission device according to an embodiment of this application;

[0045] Figure 16 is a schematic diagram of the configuration of a terminal device according to an embodiment of this application;

[0046] Figure 17 is a schematic diagram of the network device configuration according to an embodiment of this application. Detailed Implementation

[0047] Referring to the accompanying drawings, the foregoing and other features of this application will become apparent from the following description. Specific embodiments of this application are specifically disclosed in the description and drawings, illustrating partial implementations in which the principles of this application can be adopted. It should be understood that this application is not limited to the described embodiments; rather, it includes all modifications, variations, and equivalents falling within the scope of the appended claims. Various embodiments of this application are described below with reference to the accompanying drawings. These embodiments are merely exemplary and not intended to limit the scope of this application.

[0048] In the embodiments of this application, the terms "first," "second," etc., are used to distinguish different elements by name, but do not indicate the spatial arrangement or chronological order of these elements, and these elements should not be limited by these terms. The term "and / or" includes any one or more of the terms listed in association and all combinations thereof. The terms "comprising," "including," "having," etc., refer to the presence of the stated features, elements, components, or assemblies, but do not exclude the presence or addition of one or more other features, elements, components, or assemblies.

[0049] In the embodiments of this application, the singular forms "a," "the," etc., including the plural forms, should be broadly understood as "a kind" or "a class" rather than limited to the meaning of "an." Furthermore, the term "the" should be understood to include both the singular and plural forms, unless the context explicitly indicates otherwise. Additionally, the term "according to" should be understood as "at least partially based on…," and the term "based on" should be understood as "at least partially based on…," unless the context explicitly indicates otherwise.

[0050] In the embodiments of this application, the term "communication network" or "wireless communication network" may refer to a network that conforms to any of the following communication standards, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed ​​Packet Access (HSPA), etc.

[0051] Furthermore, communication between devices in a communication system can be carried out according to communication protocols at any stage, including but not limited to the following communication protocols: 1G (generation), 2G, 2.5G, 2.75G, 3G, 4G, 4.5G and 5G, New Radio (NR), 6G and future communication, and / or other currently known or future communication protocols.

[0052] In the embodiments of this application, the term "network device" refers, for example, to a device in a communication system that connects a terminal device to a communication network and provides services to that terminal device. Network devices may include, but are not limited to, the following devices: base station (BS), access point (AP), transmission reception point (TRP), broadcast transmitter, mobile management entity (MME), gateway, server, radio network controller (RNC), base station controller (BSC), etc.

[0053] The term "base station" can include, but is not limited to, NodeBs (or NBs), evolved NodeBs (eNodeBs or eNBs), 5G base stations (gNBs), 6G base stations, and future base stations, etc. It can also include Remote Radio Heads (RRHs), Remote Radio Units (RRUs), relays, or low-power nodes (e.g., femto, pico, etc.). The term "base station" can encompass some or all of its functions, and each base station can provide communication coverage to a specific geographic area. The term "cell" can refer to a base station and / or its coverage area, depending on the context in which the term is used.

[0054] In the embodiments of this application, the terms "User Equipment" (UE) or "Terminal Equipment" (TE) refer, for example, to a device that accesses a communication network and receives network services through a network device. User equipment can be fixed or mobile, and may also be referred to as a mobile station (MS), terminal, subscriber station (SS), access terminal (AT), station, etc.

[0055] The terminal device may include, but is not limited to, the following devices: cellular phone, personal digital assistant (PDA), wireless modem, wireless communication device, handheld device, machine-type communication device, laptop computer, cordless phone, smartphone, smartwatch, digital camera, XR device, etc.

[0056] For example, in scenarios such as the Internet of Things (IoT), user devices can also be machines or devices used for monitoring or measurement, including but not limited to: machine-type communication (MTC) terminals, vehicle-mounted communication terminals, device-to-device (D2D) terminals, machine-to-machine (M2M) terminals, terminals supporting sidelink communication, terminals supporting XR services, and so on.

[0057] Furthermore, the terms "network side" or "network equipment side" refer to one side of the network, which can be a base station or include one or more network devices as described above. The terms "user side," "terminal side," or "terminal equipment side" refer to the side of the user or terminal, which can be a UE or include one or more terminal devices as described above. Unless otherwise specified, "equipment" can refer to either network equipment or terminal equipment.

[0058] Without causing confusion, the terms “uplink control signal” and “uplink control information (UCI)” or “physical uplink control channel (PUCCH)” are interchangeable, as are the terms “uplink data signal” and “uplink data information (PUSCH)”.

[0059] The terms “downlink control signal” and “downlink control information (DCI)” or “physical downlink control channel (PDCCH)” are interchangeable, as are the terms “downlink data signal” and “downlink data information (PDSCH)” or “physical downlink shared channel (PDSCH)”.

[0060] Additionally, uplink signals can include uplink data signals and / or uplink control signals and / or PRACH and / or SRS, etc., and can also be referred to as uplink transmission (UL transmission), uplink information, or uplink channel. Sending / receiving uplink transmission on uplink resources can be understood as using that uplink resource to send / receive the uplink transmission. Downlink signals can include downlink data signals and / or downlink control signals and / or synchronization signals (SS, such as PSS / SSS) and / or broadcast channel (PBCH) and / or SSB (SS / PBCH block, including PSS, SSS, and PBCH and their DMRS) and / or CSI-RS, etc., and can also be referred to as downlink transmission (DL transmission), downlink information, or downlink channel. Sending / receiving downlink transmission on downlink resources can be understood as using that downlink resource to send / receive the downlink transmission. In the embodiments of this application, higher-layer signaling may be, for example, Radio Resource Control (RRC) signaling; RRC signaling may include, for example, RRC messages, such as broadcast / public RRC messages / signaling (e.g., Master Indication Block (MIB), system information (SI), private RRC messages / signaling; or RRC information element (RRC IE); or information fields (or information fields included in information fields) included in RRC messages or RRC information elements. Higher-layer signaling may also be, for example, Medium Access Control (MAC) signaling; or referred to as MAC control element (MAC CE). However, this application is not limited to this.

[0061] In the embodiments of this application, "at least one" and "one or more" can be used interchangeably, and "multiple" and "more than one" can be used interchangeably. "Multiple" means at least two, or two or more.

[0062] In this application embodiment, "predefined" refers to what is specified by the protocol or determined according to the rules specified by the protocol, and does not require additional configuration. "Configuration / instruction" refers to what the network device directly or indirectly configures / instructs through higher-layer signaling and / or physical layer signaling. Configuration / instruction can be achieved by introducing higher-layer parameters into the higher-layer signaling. Higher-layer parameters refer to information fields and / or information elements / information units / information cells (IEs) in the higher-layer signaling. Physical layer signaling refers to, for example, control information (DCI) carried by the physical downlink control channel or control information carried by the sequence, but is not limited to these.

[0063] In this embodiment of the application, network device configuration includes, for example, network device pre-configuration and network device dynamic indication. Network device pre-configuration is performed, for example, through higher-layer signaling (e.g., RRC signaling); network device dynamic indication is performed, for example, through physical layer signaling (e.g., DCI and / or MAC CE).

[0064] In the embodiments of this application, a cell that supports or uses on-demand SIB1 may also be referred to as a Network Energy Saving (NES) cell, a power-saving cell, a special cell, a cell that transmits simplified signals, or a specific type of energy-saving cell, or similar names. Similarly, a cell that supports or uses on-demand SIB1 may also be referred to as an NES cell, a power-saving cell, a special cell, a cell that transmits simplified signals, a specific type of energy-saving cell, or a cell that has entered energy-saving mode (or energy-saving state, etc.).

[0065] In the embodiments of this application, cells that do not support or use on-demand SIB1 may also be referred to as traditional (e.g., legacy) cells, normal cells, non-NES cells, or similar names. Similarly, cells that do not support or use on-demand SIB1 may also be referred to as cells that are not NES cells, cells that are not power-saving cells, cells that are not special cells, cells that do not transmit simplified signals, cells that are not specific types of energy-saving cells, or cells that have not entered energy-saving mode (or energy-saving state, etc.).

[0066] In the embodiments of this application, the terminal device that supports on-demand SIB1 may also be referred to as a network energy saving (NES) terminal device, a terminal device that supports network power saving, a terminal device with NES capability, a special terminal device, a terminal device that receives simplified signals, or a specific type of terminal device, or similar names.

[0067] In this application embodiment, terminal devices that do not support on-demand SIB1 may also be referred to as legacy terminal devices, ordinary terminal devices, normal terminal devices, terminal devices prior to Release 19, non-NES terminal devices, or terminal devices without NES capabilities, or similar names.

[0068] In the embodiments of this application, "residing in a cell" can also be described as residing normally in the cell, or temporarily residing in the cell, or selecting the cell, or reselecting the cell, or considering the cell as a suitable cell, or considering the cell as an acceptable cell, etc.

[0069] In the embodiments of this application, the "Wake Up Signal (WUS)" may also be referred to as "Uplink Wake Up Signal (UL WUS)", "Uplink Request Signal", "Uplink Activation Signal", "UE Wake Up Signal", "Physical Random Access Channel (PRACH)", "Random Access Channel", "Random Access Preamble", "Random Access Message 3 (Msg 3)" and similar names.

[0070] In the embodiments of this application, "sending / receiving on the first cell" can also be understood as "sending / receiving by the network device to which the first cell belongs," or it can be simply referred to as "sending / receiving in the first cell." "Receiving," "acquiring," and "detecting" can be used interchangeably. Overlapping indicates partial or complete overlap, while non-overlapping indicates no overlap at all.

[0071] In some embodiments, the start and end positions of the time windows involved in this application (e.g., the first time window, the second time window, and the third time window hereinafter) can be absolute time positions or relative time positions. A time window can be represented by its start position and length, for example, by its start absolute time position and length, or its start relative time position and length; a time window can also be represented by its start and end positions, and this application is not limited to this. Furthermore, the length of the time window can be in units such as milliseconds (ms), the number of radio frames (e.g., 10 ms per radio frame), the number of subframes, the number of slots, or the number of symbols, etc.

[0072] For ease of description, the following description uses a base station as an example of an access network device. In the following description, without causing confusion, "if...", "in the case of...", and "when..." can be used interchangeably.

[0073] The following examples illustrate the scenarios of embodiments of this application, but this application is not limited thereto.

[0074] Figure 1 is a schematic diagram of a communication system according to an embodiment of this application, illustrating the case of a terminal device and a network device as examples. As shown in Figure 1, the communication system 100 may include a network device 101, a terminal device 102, and a terminal device 103. For simplicity, Figure 1 only illustrates the case of two terminal devices and one network device, but the embodiments of this application are not limited to this.

[0075] In this embodiment, network device 101, terminal device 102, and terminal device 103 can transmit existing services or services that may be implemented in the future. For example, these services may include, but are not limited to: enhanced mobile broadband (eMBB), massive machine-type communication (mMTC), ultra-reliable and low-latency communication (URLLC), Internet of Things (IoT) communication, and related communication of terminal devices with reduced capabilities, etc.

[0076] Terminal devices 102 and 103 can communicate with network device 101. For example, taking terminal device 102 as an example, terminal device 102 can send data to network device 101, such as using dynamic authorization or configured authorization transmission methods. Network device 101 can receive data sent by one or more terminal devices 102 and provide feedback or uplink scheduling information to terminal device 102, such as ACK / NACK confirmation information or uplink new transmission or retransmission scheduling information. Based on the feedback or uplink scheduling information, terminal device 102 can confirm the end of the transmission process, or can initiate new data transmission, or can retransmit data. Network device 101 can also send data to terminal device 102, and terminal device 102 can receive data sent by network device 101. In addition, different terminal devices can also communicate with each other; for example, terminal device 102 and terminal device 103 can exchange data.

[0077] It is worth noting that Figure 1 shows that both terminal device 102 and terminal device 103 are within the coverage area of ​​network device 101, but this application is not limited to this. Terminal device 102 and terminal device 103 may both be outside the coverage area of ​​network device 101, or one of terminal device 102 and terminal device 103 may be within the coverage area of ​​network device 101 while the other is outside the coverage area of ​​network device 101.

[0078] Figure 2 illustrates a deployment scenario of an NES cell according to an embodiment of this application. As shown in Figure 2, for example, an NES cell is co-deployed with a coverage-providing cell, which can also be referred to as an anchor cell, Cell A, an auxiliary cell, or a neighboring cell, to assist the on-demand SIB1 process of the NES cell. The NES cell can provide network capacity. As another example, an NES cell is co-deployed with its neighboring cells, and these cells can have completely overlapping, partially overlapping, or non-overlapping coverage areas. In Figure 2, communication can occur between the NES cell and the anchor cell, between the NES cell and its neighboring cells, and between the anchor cell and its neighboring cells, for example, through the X2 interface or the F1 interface.

[0079] It is worth noting that Figure 2 shows one terminal device in an NES cell, but this application is not limited to this; there can be more than one terminal device (UE) in an NES cell. Furthermore, Figure 2 shows the terminal device within the coverage area of ​​the NES cell, but this application is not limited to this; the terminal device can also be outside the coverage area of ​​the NES cell. In addition, in Figure 2, the anchor cell can also be deployed co-located with one or more NES cells, and one or more anchor cells can provide auxiliary information to an NES cell. An NES cell can have one or more neighboring NES cells, or it can have no neighboring NES cells; this application does not impose any restrictions on this.

[0080] In another deployment scenario of NES cells, the NES cell is deployed independently, and there can be more than one terminal device (UE) in the NES cell. The terminal device can be within or outside the coverage area of ​​the NES cell, but this application is not limited to this.

[0081] One of the working objectives of 3GPP Release 19, as shown in Table 1 below, is to study the process and signaling methods to support on-demand SIB1 for UEs in idle / inactive mode, including: triggering methods for uplink wake-up signals using existing signals / channels; providing the UE with the configuration of the wake-up signal; and exchanging wake-up signal configuration information between gNBs (if necessary).

[0082] Table 1

[0083] Currently, 3GPP RAN2 has agreed on relevant scenarios regarding on-demand SIB1. Figure 3 illustrates one scenario of on-demand SIB1 according to an embodiment of this application, specifically scenario 1a. As shown in Figure 3, in scenario 1a, the terminal device obtains the WUS configuration from the anchor cell, sends the WUS to the NES cell, and receives on-demand SIB1 from the NES cell. The agreed-upon details are shown in Table 2 below:

[0084] Table 2

[0085] In addition, 3GPP RAN1 agrees to continue studying on-demand SIB1 for UEs in idle / inactive mode under the following three cases:

[0086] Case 1: The UE obtains the WUS configuration from the NES cell, sends the WUS to the NES cell, and receives on-demand SIB1 from the NES cell;

[0087] Case 2: The UE obtains the WUS configuration from the anchor cell, sends the WUS to the NES cell, and receives on-demand SIB1 from the NES cell, corresponding to scenario 1a where RAN2 agrees;

[0088] Case 3: The UE obtains the WUS configuration from the anchor cell, sends the WUS to the anchor cell, and receives the on-demand SIB1 from the anchor cell.

[0089] However, in the above-mentioned scenario regarding on-demand SIB1, it is unclear how the terminal device obtains the on-demand SIB1 of the cell if the system information of the NES cell changes, or if it is necessary to re-obtain the system information of the NES cell.

[0090] If the UE receives a system information change indication and / or Earthquake and Tsunami Warning System (ETWS) and Commercial Mobile Alert System (CMAS) notification from an NES cell (or if the UE reselects to an NES cell or returns to the service area of ​​an NES cell after cell reselection), the UE needs to obtain the system information of that NES cell, including the MIB and SIB1. This MIB and / or SIB1 may differ from the contents of the MIB and / or SIB1 previously stored by the UE for that NES cell (e.g., it may be updated or changed system information). Therefore, further discussion of the above issues is necessary.

[0091] To address at least one of the above-mentioned problems, embodiments of this application provide an information acquisition method, an information transmission method, an apparatus, and a communication system.

[0092] First aspect of the embodiments

[0093] This application provides an information acquisition method, which will be described from the perspective of a terminal device.

[0094] Figure 4 is a schematic diagram of an information acquisition method according to an embodiment of this application. The method is applied to a terminal device. As shown in Figure 4, the method includes:

[0095] 401, the terminal device receives first indication information related to the system information change of the first cell, and / or returns to the first cell, and / or reselects to the first cell;

[0096] 402, the terminal device obtains the system information block type one (on-demand SIB1) of the first cell on the first cell.

[0097] According to the above embodiments, the terminal device receives first indication information related to the system information change of the first cell, and / or returns to the first cell, and / or reselects to the first cell. Thus, when the terminal device receives the first indication information and / or returns to the first cell and / or reselects to the first cell, it can obtain the system information block type one (on-demand SIB1) of the first cell on the first cell. This helps the terminal device to obtain the on-demand SIB1 of the first cell at the correct time, and enables the terminal device and the first cell to have consistent system information. This avoids the terminal device failing to receive the public information of the first cell or failing to access the first cell due to inconsistent system information.

[0098] It is worth noting that Figure 4 above is only an illustrative description of the embodiments of this application, but this application is not limited thereto. For example, the execution order between various operations can be appropriately adjusted, and other operations can be added or some operations can be removed. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description in Figure 4 above.

[0099] In some embodiments, the terminal device includes a terminal device in an RRC idle (RRC_Idle) state or an RRC inactive (RRC_Inactive) state.

[0100] In some embodiments, the first cell is a cell that supports or uses on-demand SIB1, and may also be referred to as an NES cell or other similar names. Since the first cell is an NES cell, the System Information Block #1 (SIB1) of the first cell may also be referred to as the on-demand SIB1 of the first cell or other names.

[0101] In some embodiments, the first indication information is sent by the network device to which the first cell belongs on the first cell, and the first indication information includes at least one of the following:

[0102] The first information indicating a change in system information;

[0103] The second message indicating the change of on-demand SIB1;

[0104] ETWS and CMAS notification information.

[0105] In some embodiments, the first indication information is carried by the downlink control information (DCI) corresponding to a short message or paging early indication (PEI).

[0106] Taking the first indication information carried by a short message as an example, Table 3 is a definition of a short message. As shown in Table 3, a short message includes Bits 1 to 8, where Bit 1 is the most significant bit. Bit 1 (systemInfoModification) in Table 3 can be used as the first information to indicate whether the system information has changed. For example, when Bit 1 is 1, it indicates that the system information (system information carried by BCCH excluding SIB6, SIB7, SIB8, and the positioning SIB) has changed. Any one of Bits 5 to 8 in Table 3 can be used as the second information to indicate whether the on-demand SIB1 has changed. For example, when Bit 5 is 1, it indicates that the on-demand SIB1 has changed. Bit 2 (etwsAndCMasIndication) in Table 3 can be used as ETWS and CMAS notification information. For example, when Bit 2 is 1, it indicates that ETWS and CMAS notification information have been sent.

[0107] Table 3: short message

[0108] In some embodiments, a short message may be transmitted on a PDCCH using a Paging Radio Network Temporary Identity (P-RNTI). The short message may be associated with a paging message or may not be associated with a paging message. For example, a short message may use the Short Message field in DCI format 1_0.

[0109] In some embodiments, the terminal device resides in the first cell. When the terminal device receives first indication information related to a change in system information of the first cell, and / or returns to the first cell, and / or reselects to the first cell, the terminal device obtains the system information of the first cell on the first cell, including system information block type one (on-demand SIB1), or in other words, the terminal device expects to receive the on-demand SIB1 of the first cell.

[0110] In some embodiments, the terminal device acquiring the on-demand SIB1 of the first cell includes: listening to the PDCCH that schedules the on-demand SIB1 of the first cell, and / or receiving the on-demand SIB1 of the first cell carried on the PDSCH scheduled by the PDCCH; the terminal device stopping acquiring the on-demand SIB1 of the first cell includes: stopping listening to the PDCCH that schedules the on-demand SIB1 of the first cell, and / or stopping receiving the on-demand SIB1 of the first cell carried on the PDSCH scheduled by the PDCCH.

[0111] In some embodiments, the search space and / or coreset of the PDCCH for scheduling the on-demand SIB1 of the first cell are configured or predefined by the network device. For example, when configured by the network device, the configuration information of the search space and / or coreset of the PDCCH for scheduling the on-demand SIB1 of the first cell may be included in the updated or changed MIB of the first cell, or may be included in the WUS configuration. This embodiment of the application does not limit this.

[0112] In some embodiments, if the MIB of the first cell changes or remains unchanged, while SIB1 and other SIs remain unchanged, the terminal device does not need to obtain the on-demand SIB1 of the first cell, and the terminal device continues to use the stored version or valid version of the SIB1 of the first cell. If the SIB1 of the first cell or other SIs related to SIB1 changes, the terminal device can obtain the on-demand SIB1 on the first cell.

[0113] In some embodiments, the first cell may send on-demand SIB1 autonomously (or proactively), or it may send on-demand SIB1 upon request from the terminal device.

[0114] In some embodiments, when or after the first cell sends the first indication information, the first cell, regardless of whether it receives a WUS sent by the terminal device, autonomously (or proactively) sends on-demand SIB1. In this case, after receiving the first indication information, or after returning to the first cell, or after reselecting to the first cell, the terminal device does not trigger or send a WUS related to the on-demand SIB1 of the first cell, but directly executes step 402 to obtain the on-demand SIB1 of the first cell. Alternatively, the terminal device may send a WUS related to the on-demand SIB1 of the first cell to request the first cell to send on-demand SIB1. These will be explained separately below.

[0115] (a) Cases where the terminal device does not trigger or send WUS

[0116] The following describes an embodiment of a terminal device obtaining the on-demand SIB1 of a first cell in a first cell, where the first instruction information includes first information and / or second information.

[0117] As one implementation, in step 402, the terminal device acquires the on-demand SIB1 of the first cell either in the next modification period or at the beginning of the next modification period. In this case, the terminal device expects the on-demand SIB1 of the first cell to be sent in the next modification period.

[0118] Figure 5 is a schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application. As shown in Figure 5, the terminal device receives the first indication information in the current modification period (Modification period n) and obtains the on-demand SIB1 of the first cell in the next modification period (Modification period n+1) or from the beginning of the next modification period.

[0119] In some embodiments, the terminal device begins acquiring the on-demand SIB1 of the first cell at a first specific moment in the next modification cycle.

[0120] For example, the first specific moment is the first moment t1 at the start of the next modification cycle, or it is the second moment t2 corresponding to the first offset time T1 after the start of the next modification cycle, i.e., t2 = t1 + T1.

[0121] In some embodiments, after obtaining the on-demand SIB1 of the first cell, the terminal device stops obtaining the on-demand SIB1 of the first cell.

[0122] In some embodiments, the terminal device stops acquiring the on-demand SIB1 of the first cell at a second specific time. For example, if the terminal device fails to acquire the on-demand SIB1 of the first cell, it may stop acquiring the on-demand SIB1 of the first cell at the second specific time. The failure of the terminal device to acquire the on-demand SIB1 of the first cell can also be considered as a failure or unsuccessful acquisition of the on-demand SIB1.

[0123] For example, the second specific time is the third time t3 at the end of the next modification cycle, or the fourth time t4 corresponding to the second offset time T2 before the end of the next modification cycle, i.e., t4 = t3 - T2, or the fifth time t5 corresponding to the third offset time T3 after the end of the next modification cycle, i.e., t5 = t3 + T3.

[0124] In some embodiments, the first offset time T1, the second offset time T2, and the third offset time T3 are predefined.

[0125] In some embodiments, the first offset time T1, the second offset time T2, and the third offset time T3 are configured by the network device, for example, by the first cell (NES cell) or the anchor cell (Cell A). For example, the first offset time T1, the second offset time T2, and the third offset time T3 may be included in the WUS configuration of the first cell or in the first indication information.

[0126] In some embodiments, the on-demand SIB1 of the first cell obtained by the terminal device in the next modification cycle is the updated on-demand SIB1 of the first cell. In the embodiments of this application, the updated on-demand SIB1 may also be referred to as the updated on-demand SIB1, the latest on-demand SIB1, or the changed on-demand SIB, etc.

[0127] As one implementation, in step 402, the terminal device acquires the on-demand SIB1 of the first cell within a first time window. In this case, the terminal device expects the on-demand SIB1 of the first cell to be transmitted within the first time window.

[0128] In some embodiments, the first time window is a time window for the monitoring occasion of PDCCH (e.g., type 0 PDCCH or PDCCH scheduled for SIB1); and / or, the first time window is a time window for receiving on-demand SIB1 from the first cell.

[0129] In some embodiments, the start position and / or length and / or end position of the first time window are predefined.

[0130] In some embodiments, the start position and / or length and / or end position of the first time window are configured by the network device, for example, by the first cell (NES cell) or the anchor cell (Cell A). For example, the start position and / or length and / or end position of the first time window may be included in the WUS configuration of the first cell or in the first indication information.

[0131] In some embodiments, the relationship between the first time window and the modification period includes:

[0132] The first time window overlaps with the current modification cycle; or

[0133] The first time window does not overlap with the current modification period; or

[0134] The first time window overlaps with the next modification cycle; or

[0135] The first time window does not overlap with the next modification cycle; or

[0136] The first time window spans different modification cycles; for example, the first time window overlaps with both the current modification cycle and the next modification cycle.

[0137] In some embodiments, the first time window is independent of the modification period, that is, the modification period does not need to be considered when the terminal device obtains the updated demand SIB1.

[0138] In some embodiments, after obtaining the on-demand SIB1 of the first cell, the terminal device stops obtaining the on-demand SIB1 of the first cell.

[0139] In some embodiments, the terminal device stops acquiring the on-demand SIB1 of the first cell at the end of the first time window. For example, if the terminal device fails to acquire the on-demand SIB1 of the first cell, it may stop acquiring the on-demand SIB1 of the first cell at the end of the first time window. The failure of the terminal device to acquire the on-demand SIB1 of the first cell can also be considered as a failure or unsuccessful acquisition of the on-demand SIB1.

[0140] Figure 6 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application. Figure 6 shows the case where the first time window overlaps with both the current modification period (Modification period n) and the next modification period (Modification period n+1). As shown in Figure 6, the terminal device receives the first indication information in the current modification period and obtains the on-demand SIB1 of the first cell in the first time window.

[0141] In some embodiments, the terminal device does not consider the modification period when acquiring on-demand SIB1 on the first cell. For example, the terminal device acquires the updated on-demand SIB1 of the first cell within a first time window, as shown in Figure 6, where the dark squares within the first time window indicate that the terminal device acquires the updated on-demand SIB1 of the first cell. That is, the first cell sends the updated on-demand SIB1 within the first time window. In this case, the relationship between the first time window and the modification period does not need to be considered.

[0142] In some embodiments, the terminal device considers the modification period when acquiring on-demand SIB1 on the first cell. For example, the terminal device acquires the on-demand SIB1 before the update during the time when the first time window overlaps with the current modification period, and acquires the updated on-demand SIB1 during the time when the first time window overlaps with the next modification period. For example, FIG7 is another schematic diagram of acquiring on-demand SIB1 according to an embodiment of the present application. As shown in FIG7, the light-colored square in the first time window indicates that the terminal device acquires the on-demand SIB1 before the update of the first cell, and the dark-colored square in the first time window indicates that the terminal device acquires the updated on-demand SIB1 of the first cell. That is, the first cell sends the on-demand SIB1 before the update during the time when the first time window overlaps with the current modification period, and the first cell sends the updated on-demand SIB1 during the time when the first time window overlaps with the next modification period.

[0143] In some embodiments, the terminal device considers the modification period when acquiring on-demand SIB1 on the first cell. For example, the terminal device acquires the updated on-demand SIB1 during the time when the first time window overlaps with the next modification period, and may not acquire on-demand SIB1 during the time when the first time window overlaps with the current modification period. For example, the first cell may send the on-demand SIB1 before the update or not send on-demand SIB1 during the time when the first time window overlaps with the current modification period, and send the updated on-demand SIB1 during the time when the first time window overlaps with the next modification period.

[0144] As one implementation, in step 402, the terminal device begins acquiring the on-demand SIB1 of the first cell at a predetermined start time. In this case, the terminal device anticipates that the on-demand SIB1 of the first cell has a specific start time (i.e., a predetermined start time).

[0145] In some embodiments, after obtaining the on-demand SIB1 of the first cell, the terminal device stops obtaining the on-demand SIB1 of the first cell.

[0146] In some embodiments, the method further includes:

[0147] The terminal device stops acquiring on-demand SIB1 of the first cell at the predetermined end time. In this case, the terminal device expects that on-demand SIB1 of the first cell will stop transmitting at a certain point (i.e., the predetermined end time).

[0148] For example, the terminal device obtains the on-demand SIB1 of the first cell between the predetermined start time and the predetermined stop time. That is, the first cell sends on-demand SIB1 between the predetermined start time and the predetermined stop time. In other words, the time period between the predetermined start time and the predetermined stop time is the time when on-demand SIB1 is sent on the first cell.

[0149] For example, if the terminal device fails to acquire the on-demand SIB1 of the first cell, it can stop acquiring the on-demand SIB1 of the first cell at the predetermined end time. The failure of the terminal device to acquire the on-demand SIB1 of the first cell can also be regarded as a failure to acquire on-demand SIB1 or an unsuccessful acquisition of on-demand SIB1.

[0150] In some embodiments, the predetermined start time and / or the predetermined stop time are predefined.

[0151] In some embodiments, the predetermined start time and / or the predetermined stop time is configured by the network device, for example, by the first cell (NES cell) or the anchor cell (Cell A). For example, the start position and / or length and / or end position of the first time window may be included in the WUS configuration of the first cell or in the first indication information.

[0152] In some embodiments, the network device dynamically indicates the predetermined start time and / or the predetermined stop time. For example, the network device dynamically indicates the predetermined start time and / or the predetermined stop time through Downlink Control Information (DCI) and / or Media Access Control (MAC CE). The DCI may be, for example, a paging short message or a paging advance indication (PEI).

[0153] In some embodiments, the relationship between the predetermined start time, the predetermined stop time, and the modification period includes:

[0154] The predetermined start time and predetermined stop time are within the same modification period, for example, both within the current modification period, or both within the next modification period or a subsequent modification period; in this case, the time when the terminal device obtains the on-demand SIB1 of the first cell or the time when it sends the on-demand SIB1 on the first cell overlaps with a modification period; or

[0155] The predetermined start time and predetermined stop time are in different modification periods. For example, the predetermined start time is in the current modification period, and the predetermined stop time is in the next modification period. In this case, the terminal device obtains the on-demand SIB1 time of the first cell or transmits the on-demand SIB1 on the first cell across different modification periods.

[0156] In some embodiments, the terminal device does not consider the modification period when acquiring on-demand SIB1 on the first cell. For example, the terminal device acquires the updated on-demand SIB1 between a predetermined start time and a predetermined stop time, i.e., during the time when on-demand SIB1 is transmitted on the first cell.

[0157] Figure 8 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application. Figure 8 shows that the predetermined start time is in the current modification period (Modification period n), and the predetermined stop time is in the next modification period (Modification period n+1). That is, the time when the terminal device obtains the on-demand SIB1 of the first cell or the time when it sends the on-demand SIB1 on the first cell overlaps with both the current modification period and the next modification period. As shown in Figure 8, the terminal device receives the first indication information in the current modification period, starts obtaining the on-demand SIB1 of the first cell at the predetermined start time, and stops obtaining the on-demand SIB1 of the first cell at the predetermined stop time. As shown in Figure 8, the dark square between the predetermined start time and the predetermined stop time indicates that the terminal device obtains the updated on-demand SIB1 of the first cell. That is, the first cell sends the updated on-demand SIB1 between the predetermined start time and the predetermined stop time. In this case, it is not necessary to consider the relationship between the predetermined start time, the predetermined stop time, and the modification period.

[0158] In some embodiments, the terminal device considers the modification period when acquiring on-demand SIB1 on the first cell. For example, the terminal device acquires the unupdated (not updated) on-demand SIB1 during the time when the time of transmitting on-demand SIB1 on the first cell overlaps with the current modification period, and acquires the updated on-demand SIB1 during the time when the time of transmitting on-demand SIB1 on the first cell overlaps with the next modification period. For example, FIG9 is another schematic diagram of acquiring on-demand SIB1 according to an embodiment of this application. As shown in FIG9, during the time when on-demand SIB1 is transmitted on the first cell, light-colored squares indicate that the terminal device acquires the on-demand SIB1 before the update of the first cell, and dark-colored squares indicate that the terminal device acquires the updated on-demand SIB1 of the first cell. That is, the first cell transmits the unupdated on-demand SIB1 during the time when the time of transmitting on-demand SIB1 overlaps with the current modification period, and the first cell transmits the updated on-demand SIB1 during the time when the time of transmitting on-demand SIB1 overlaps with the next modification period.

[0159] In some embodiments, the terminal device acquires the updated on-demand SIB1 of the first cell during the period when the time of transmitting on-demand SIB1 on the first cell overlaps with the next modification period, and may not acquire the on-demand SIB1 of the first cell during the period when the time of transmitting on-demand SIB1 on the first cell overlaps with the current modification period. For example, the first cell may transmit the on-demand SIB1 before the update during the period when the time of transmitting on-demand SIB1 overlaps with the current modification period, or it may not transmit on-demand SIB1 at all. The first cell may transmit the updated on-demand SIB1 during the period when the time of transmitting on-demand SIB1 overlaps with the next modification period.

[0160] The following describes an embodiment of a terminal device obtaining the on-demand SIB1 of the first cell in the case where the first instruction information includes ETWS and CMAS notification information.

[0161] In some embodiments, in step 402, when the terminal device receives the ETWS and CMAS notification information, it immediately obtains the on-demand SIB1 of the first cell.

[0162] In some embodiments, the terminal device acquires the on-demand SIB1 of the first cell starting from a sixth time t6, a seventh time t7 at a specific time offset before the sixth time t6, or an eighth time t8 at a specific time offset after the sixth time t6, after receiving the first indication information containing the ETWS and CMAS notification information sent by the first cell. In this case, the terminal device expects the on-demand SIB1 of the first cell to be transmitted starting from the sixth time t6, the seventh time t7, or the eighth time t8.

[0163] In some embodiments, the terminal device acquires the on-demand SIB1 of the first cell in a second time window. In this case, the terminal device expects the on-demand SIB1 of the first cell to be transmitted in the second time window.

[0164] In some embodiments, the start time of the second time window may be, for example, the sixth time t6 when the first indication information containing the ETWS and CMAS notification information is received from the first cell, or the seventh time t7 with a specific time offset before the sixth time t6, or the eighth time t8 with a specific time offset after the sixth time t6, and this application is not limited thereto.

[0165] In some embodiments, the length of the second time window is, for example, an integer multiple of the paging DRX cycle or the modification cycle, but this application is not limited thereto.

[0166] In some embodiments, the end time of the second time window is, for example, the end time of any modification period after the current modification period (Modification period n), such as the end time of the next modification period (Modification period n+1), or the end time of the m-th modification period (Modification period n+m) after the current modification period, but this application is not limited thereto.

[0167] In some embodiments, the specific time offset and / or the seventh time and / or the eighth time and / or the length and / or end time of the second time window are predefined.

[0168] In some embodiments, the specific time offset and / or the seventh time and / or the eighth time and / or the length and / or end time of the second time window are configured by the network device, for example, by the first cell (NES cell) or the anchor cell (Cell A). For example, the seventh time and / or the eighth time and / or the length and / or end time of the second time window may be included in the WUS configuration of the first cell or in the first indication information.

[0169] In some embodiments, the network device dynamically indicates the length and / or end time of the second time window. For example, the network device dynamically indicates the length and / or end time of the second time window through Downlink Control Information (DCI) and / or Media Access Control (MAC CE). The DCI may be, for example, a paging short message or a paging advance indication (PEI).

[0170] In some embodiments, the terminal device acquires the updated on-demand SIB1 of the first cell in a second time window. For example, FIG10 is another schematic diagram of acquiring on-demand SIB1 according to an embodiment of this application. As shown in FIG10, the terminal device receives first indication information in the current modification period n and acquires the on-demand SIB1 of the first cell in the second time window. In FIG10, the dark squares in the second time window indicate that the terminal device acquires the updated on-demand SIB1 of the first cell. That is, the first cell sends the updated on-demand SIB1 in the second time window.

[0171] In some embodiments, the implementation of obtaining the on-demand SIB1 of the first cell on the first cell when the terminal device returns to and / or reselects to the first cell is similar to the implementation of obtaining the on-demand SIB1 of the first cell on the first cell when the terminal device receives the first indication information. The difference is that when the terminal device returns to and / or reselects to the first cell, the "first indication information" in Figures 6 to 10 may not appear. For details, please refer to the relevant embodiments of this application, which will not be repeated here.

[0172] (ii) Situations where the terminal device triggers or sends WUS

[0173] In some embodiments, where the first indication information includes first information or second information or ETWS and CMAS notification information, the terminal device further sends a wake-up signal (WUS) related to the on-demand SIB1 of the first cell to obtain the on-demand SIB1 of the first cell.

[0174] For example, after receiving the first instruction information, or after returning to the first cell, or after reselecting to the first cell, the terminal device triggers or sends a WUS related to the on-demand SIB1 of the first cell, and then executes step 402 to obtain the on-demand SIB1 of the first cell.

[0175] In some embodiments, the terminal device triggers or sends the WUS when it receives the first indication information, and / or returns to the first cell, and / or reselects to the first cell.

[0176] In some embodiments, the relationship between the time when the terminal device triggers or sends WUS and the modification period is as follows:

[0177] The terminal device triggers or sends the WUS during the current modification cycle; or

[0178] The terminal device triggers or sends the WUS in the next modification cycle.

[0179] In some embodiments, after the terminal device receives the first indication information and / or returns to the first cell and / or reselects to the first cell, before triggering or sending WUS, the terminal device acquires the on-demand SIB1 in the first cell;

[0180] Furthermore, the terminal device triggers or sends the WUS without obtaining the on-demand SIB1 in the first cell.

[0181] In some embodiments, after the terminal device receives the first indication information and / or returns to the first cell and / or reselects to the first cell, before triggering or sending WUS, the terminal device acquires the on-demand SIB1 in the first cell starting from the next modification cycle;

[0182] Furthermore, the terminal device triggers or sends the WUS without obtaining the on-demand SIB1 in the first cell.

[0183] Before the terminal device triggers or sends WUS to the first cell, the first cell may have already sent on-demand SIB1 at the request of other terminal devices. Therefore, the terminal device first obtains the on-demand SIB1 of the first cell. If it does not obtain the on-demand SIB1 of the first cell, it then triggers or sends WUS. This can further save power consumption of the terminal device and the first cell.

[0184] In some embodiments, if the terminal device obtains the on-demand SIB1 in the current modification cycle, it may also trigger or send the WUS.

[0185] In some embodiments, after the terminal device triggers or sends the WUS, in 402, the terminal device acquires the on-demand SIB1 of the first cell in a third time window.

[0186] In some embodiments, the third time window is, for example, the time window for listening to PDCCH (e.g., type 0 PDCCH or PDCCH scheduled for SIB1).

[0187] In some embodiments, the start position and / or length and / or end position of the third time window are predefined.

[0188] In some embodiments, the start position and / or length and / or end position of the third time window are configured by the network device, for example, by the first cell (NES cell) or the anchor cell (Cell A). For example, the start position and / or length and / or end position of the third time window may be included in the WUS configuration of the first cell or in the first indication information; or the start position and / or length and / or end position of the third time window may also be included, for example, in the confirmation information for WUS, such as a RAR message.

[0189] In some embodiments, the relationship between the third time window and the modification period includes:

[0190] The third time window overlaps with the current modification cycle; or

[0191] The third time window does not overlap with the current modification period; or

[0192] The third time window overlaps with the next modification cycle; or

[0193] The third time window does not overlap with the next modification cycle; or

[0194] The third time window spans different modification cycles; for example, the third time window overlaps with both the current modification cycle and the next modification cycle.

[0195] Figure 11 is another schematic diagram of obtaining on-demand SIB1 according to an embodiment of this application. Figure 11 shows the case where the third time window overlaps with both the current modification period (Modification period n) and the next modification period (Modification period n+1). As shown in Figure 11, the terminal device receives the first indication information in the current modification period and obtains the on-demand SIB1 of the first cell in the third time window.

[0196] In some embodiments, the terminal device acquires the updated on-demand SIB1 of the first cell within a third time window. For example, as shown in Figure 11, the dark square within the third time window indicates that the terminal device acquires the updated on-demand SIB1 of the first cell. That is, the first cell sends the updated on-demand SIB1 within the third time window, meaning the first cell can send the updated on-demand SIB1 within the third time window without considering the modification cycle.

[0197] In some embodiments, the terminal device acquires the unupdated (non-updated) on-demand SIB1 during the time when the third time window overlaps with the current modification period, and acquires the updated on-demand SIB1 during the time when the third time window overlaps with the next modification period. For example, FIG12 is another schematic diagram of acquiring on-demand SIB1 according to an embodiment of this application. As shown in FIG12, the light-colored square in the third time window indicates that the terminal device acquires the on-demand SIB1 before the update of the first cell, and the dark-colored square in the third time window indicates that the terminal device acquires the updated on-demand SIB1 of the first cell. That is, the first cell sends the unupdated on-demand SIB1 during the time when the third time window overlaps with the current modification period, and the first cell sends the updated on-demand SIB1 during the time when the third time window overlaps with the next modification period.

[0198] In some embodiments, the terminal device acquires the updated on-demand SIB1 of the first cell during the period when the third time window overlaps with the next modification period, and may not acquire the on-demand SIB1 of the first cell during the period when the third time window overlaps with the current modification period. For example, the first cell may send the on-demand SIB1 before the update or not send on-demand SIB1 during the period when the third time window overlaps with the current modification period, and the first cell may send the updated on-demand SIB1 during the period when the third time window overlaps with the next modification period.

[0199] Figures 11 and 12 illustrate the case where the terminal device sends WUS after receiving the first indication information. The case where the terminal device returns to the first cell, reselects to the first cell, and then sends WUS is similar. However, the first indication information in Figures 11 and 12 may not appear. For specific details, please refer to the relevant embodiments, which will not be repeated here.

[0200] In some embodiments, in a first cell with on-demand SIB1, if a terminal device camps on the first cell and deletes the stored version of on-demand SIB1 3 hours after obtaining a valid version of SIB1, the terminal device, lacking a valid version of SIB1, will send WUS to request on-demand SIB1 from the first cell. Since different terminal devices may obtain a valid version of SIB1 at different times, the timeout for the stored version of on-demand SIB1 may also differ for different terminal devices. This could result in multiple UEs in the first cell sending WUS to request on-demand SIB1, causing the first cell to frequently send on-demand SIB1, consuming significant radio resources and hindering network energy conservation.

[0201] Therefore, in some embodiments, after the terminal device obtains the on-demand SIB1 of the first cell, the method further includes:

[0202] The terminal device deletes the stored version of the system information block after a first preset time period starting from the moment when the system information block other than on-demand SIB1 of the first cell is confirmed to be valid.

[0203] Therefore, for system information blocks other than on-demand SIB1, after their validity period expires, the terminal device deletes the stored version of the system information block, but does not delete the stored version of on-demand SIB1. The stored version of on-demand SIB1 is used to receive the common channel of the first cell (e.g., paging and / or random access response and / or system information) or to perform access in the first cell (e.g., random access procedure and / or initial access procedure), thereby reducing the number of times on-demand SIB1 is requested from the first cell, that is, reducing the number of times the terminal device sends WUS, and also reducing the number of times the first cell sends on-demand SIB1.

[0204] In some embodiments, the first preset duration is configured or predefined by the network, and the first effective duration is, for example, 3 hours.

[0205] The modifications to the protocol are shown in Table 4 below:

[0206] Table 4: Example of Protocol Modification 1

[0207] In some embodiments, after the terminal device obtains the on-demand SIB1 of the first cell, the method further includes:

[0208] The system information block of the first cell has a first valid duration, and the on-demand SIB1 of the first cell has a second valid duration, which is longer than the first valid duration.

[0209] In some embodiments, the first valid duration and / or the second valid duration are predefined. For example, the first valid duration is 3 hours, and the second valid duration is a time greater than 3 hours, such as 4 to 8 hours.

[0210] In some embodiments, the first effective duration and / or the second effective duration are configured by the network device. For example, the network device configures the values ​​of the first effective duration and / or the second effective duration through a first cell and / or an anchor cell. For instance, the network device can configure the first effective duration and / or the second effective duration for terminal devices in the RRC_Idle state or RRC_Inactive state through system information (including MIB and / or SIB), and / or the network device can configure the first effective duration and / or the second effective duration for terminal devices in the RRC_CONNECTED state through RRC dedicated signaling. After the terminal device enters the RRC_Idle state or RRC_Inactive state, it uses the configured first effective duration and / or the second effective duration.

[0211] In some embodiments, the system information blocks of the first cell other than on-demand SIB1 have a first validity period, and the on-demand SIB1 of the first cell has a second validity period, the second validity period being longer than the first validity period.

[0212] In some embodiments, all system information blocks including on-demand SIB1 of the first cell have a first valid duration, and the on-demand SIB1 of the first cell also has a second valid duration, the second valid duration being longer than the first valid duration, and the priority of the second valid duration being higher than the priority of the first valid duration.

[0213] In some embodiments, starting from obtaining on-demand SIB1 or a valid on-demand SIB1 from the terminal device, the on-demand SIB1 is considered invalid or no longer valid after a second valid duration is reached.

[0214] In some embodiments, the terminal device re-times when it receives an updated on-demand SIB1 or an updated valid on-demand SIB1.

[0215] In some embodiments, when the terminal device obtains on-demand SIB1 or obtains a valid on-demand SIB1, it starts a timer whose length or value is set to the second valid duration. When the timer expires, the terminal device considers the stored version of on-demand SIB1 to be invalid or no longer valid. Furthermore, the terminal device may also restart the timer when it obtains an updated on-demand SIB1 or obtains an updated valid on-demand SIB1.

[0216] Therefore, the validity period of on-demand SIB1 in the first cell is longer than the first validity period of system information blocks other than on-demand SIB1 in the system information blocks. Thus, after the validity period of system information blocks other than on-demand SIB1 expires, on-demand SIB1 in the first cell is still valid. Only the stored version of system information blocks other than on-demand SIB1 can be deleted, without deleting the stored version of on-demand SIB1. The stored version of on-demand SIB1 can be used to receive the common channel (e.g., paging and / or random access response and / or system information) of the first cell or to perform access (e.g., random access procedure and / or initial access procedure) in the first cell, thereby reducing the number of times on-demand SIB1 is requested from the first cell, that is, reducing the number of times the terminal device sends WUS, and also reducing the number of times the first cell sends on-demand SIB1.

[0217] In some embodiments, the first valid duration, the second valid duration, the priority of the first valid duration, and the priority of the second valid duration are network-configured or predefined. For example, the first valid duration is 3 hours, and the second valid duration is a duration greater than 3 hours, such as 4 to 8 hours.

[0218] In some embodiments, after the terminal device obtains the on-demand SIB1 of the first cell, the method further includes:

[0219] After the terminal device receives the on-demand SIB1 from the first cell,

[0220] If the terminal device does not receive the first indication information, the on-demand SIB1 of the first cell is considered valid; and / or

[0221] If the terminal device receives the first indication information, it considers the on-demand SIB1 of the first cell to be invalid.

[0222] Therefore, after the terminal device receives the on-demand SIB1 from the first cell, it considers the stored version of the on-demand SIB1 of the first cell to be valid until it receives the first indication information related to the change of system information of the first cell. Thus, before receiving the first indication information, the terminal device considers the stored version of the on-demand SIB1 of the first cell to be valid, does not delete the stored version of the on-demand SIB1, and uses the stored version of the on-demand SIB1 to receive the common channel (e.g., paging and / or random access response and / or system information) of the first cell or to perform access (e.g., random access procedure and / or initial access procedure) in the first cell, thereby reducing the number of times the terminal device requests the on-demand SIB1 of the first cell, i.e., reducing the number of times the terminal device sends WUS, and also reducing the number of times the first cell sends the on-demand SIB1.

[0223] The implementation of the validity of on-demand SIB1 can be implemented independently of or in combination with the aforementioned implementation of obtaining on-demand SIB1, and the embodiments of this application are not intended to limit it.

[0224] As can be seen from the above embodiments, in the information acquisition method of this application embodiment, the terminal device receives first indication information related to the system information change of the first cell, and / or returns to the first cell, and / or reselects to the first cell. Thus, when the terminal device receives the first indication information and / or returns to the first cell and / or reselects to the first cell, it can acquire the system information block type one (on-demand SIB1) of the first cell on the first cell. This helps the terminal device to acquire the on-demand SIB1 of the first cell at the correct time, and enables the terminal device and the first cell to have consistent system information, thereby avoiding the failure of the terminal device to receive the public information of the first cell or the failure of the terminal device to access the first cell due to inconsistent system information.

[0225] Furthermore, after the validity period of system information blocks other than on-demand SIB1 in the first cell expires, the terminal device does not delete the stored version of on-demand SIB1, or configures the validity period of on-demand SIB1 in the first cell to be longer than the validity period of system information blocks other than on-demand SIB1, or considers the on-demand SIB1 of the first cell to be valid before receiving the first indication information, and uses the stored version of on-demand SIB1 to receive the common channel (e.g., paging and / or random access response and / or system information) of the first cell or to perform access (e.g., random access procedure and / or initial access procedure) in the first cell, thereby reducing the number of times the terminal device requests on-demand SIB1 of the first cell, that is, reducing the number of times the terminal device sends WUS, and also reducing the number of times the first cell sends on-demand SIB1.

[0226] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0227] It is worth noting that the above description only covers the steps relevant to this application, but this application is not limited thereto. The information acquisition method of this application may also include other steps, and for details of these steps, please refer to relevant technologies.

[0228] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0229] Second aspect of the embodiments

[0230] This application provides an information transmission method, which is described from the perspective of a network device.

[0231] Figure 13 is a schematic diagram of an information sending method according to an embodiment of this application. The method is applied to a network device. As shown in Figure 13, the method includes:

[0232] 1301, The network device sends a first indication message related to the change of system information of the first cell to the terminal device, as well as the system information block type one (on-demand SIB1) of the first cell.

[0233] According to the above embodiments, the network device sends a first indication message related to a change in system information of the first cell to the terminal device, so that the terminal device, upon receiving the first indication message and / or returning to the first cell and / or reselecting to the first cell, can obtain the on-demand SIB1 of the first cell. Thus, the terminal device can obtain the system information block type one (on-demand SIB1) of the first cell upon receiving the first indication message and / or returning to the first cell and / or reselecting to the first cell. This helps the terminal device obtain the on-demand SIB1 of the first cell at the correct time, ensuring that the terminal device and the first cell have consistent system information, thereby avoiding the terminal device's failure to receive public information from the first cell or the terminal device's failure to access the first cell due to inconsistent system information.

[0234] It is worth noting that Figure 13 above is only an illustrative description of the embodiments of this application, but this application is not limited thereto. For example, the execution order between various operations can be appropriately adjusted, and other operations can be added or some operations can be removed. Those skilled in the art can make appropriate modifications based on the above content, and are not limited to the description in Figure 13 above.

[0235] In some embodiments, the implementation and terminology of 1301 in this embodiment are similar to those of 401 and 402 in the embodiments of the first aspect of this application. The above related content is incorporated herein and will not be repeated here.

[0236] In some embodiments, the first indication information includes at least one of the following:

[0237] The first information indicating a change in system information;

[0238] The second message indicating the change of on-demand SIB1;

[0239] ETWS and CMAS notification information.

[0240] In some embodiments, when the first indication information includes the first information or the second information or the ETWS and CMAS notification information, the specific method by which the terminal device obtains the on-demand SIB1 of the first cell on the first cell is described in the embodiments of the first aspect, and will not be repeated here.

[0241] In some embodiments, regarding the method by which the first cell sends on-demand SIB1, the first cell may send on-demand SIB1 autonomously (or proactively), or it may send on-demand SIB1 according to the request of the terminal device.

[0242] In some embodiments, the first cell may send on-demand SIB1 autonomously (or proactively) regardless of whether it receives WUS sent by the terminal device.

[0243] In some embodiments, the method further includes:

[0244] The network device receives a wake-up signal (WUS) related to the on-demand SIB1 of the first cell sent by the terminal device.

[0245] In some embodiments, the specific method by which the terminal device sends a wake-up signal (WUS) related to the on-demand SIB1 of the first cell is described in the embodiments of the first aspect, and will not be repeated here.

[0246] According to the above embodiments, the network device sends a first indication message related to the system information change of the first cell to the terminal device. As a result, the terminal device can obtain the system information block type one (on-demand SIB1) of the first cell when it receives the first indication message and / or returns to the first cell and / or reselects to the first cell. This helps the terminal device to obtain the on-demand SIB1 of the first cell at the correct time, and enables the terminal device and the first cell to have consistent system information. This avoids the terminal device failing to receive public information of the first cell or failing to access the first cell due to inconsistent system information.

[0247] The implementation and terminology of this embodiment are similar to those of the embodiment of the first aspect of this application. The relevant content above is incorporated herein and will not be repeated here.

[0248] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0249] It is worth noting that the above description only covers the steps relevant to this application, but this application is not limited thereto. The information transmission method of this application may also include other steps, and for details of these steps, please refer to relevant technologies.

[0250] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0251] Third aspect of the embodiments

[0252] This application provides an information acquisition device, applied / configured on a terminal device. This information acquisition device and the information acquisition method in the first aspect of this application are based on the same inventive concept and have similar problem-solving principles. Therefore, the implementation of the information acquisition device is the same as the implementation of the information acquisition method in the first aspect of this application, and repeated details will not be described again. As used below, the terms "unit" or "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0253] Figure 14 is a schematic diagram of an information acquisition device according to an embodiment of this application. As shown in Figure 14, the information acquisition device 1400 includes:

[0254] The first processing unit 1401 is configured to receive first indication information related to a change in system information of the first cell, and / or return to the first cell, and / or reselect to the first cell;

[0255] The first acquisition unit 1402 is used by the terminal device to acquire the system information block type one (on-demand SIB1) of the first cell.

[0256] According to the above embodiments, the terminal device receives first indication information related to the system information change of the first cell, and / or returns to the first cell, and / or reselects to the first cell. Thus, when the terminal device receives the first indication information and / or returns to the first cell and / or reselects to the first cell, it can obtain the system information block type one (on-demand SIB1) of the first cell on the first cell. This helps the terminal device to obtain the on-demand SIB1 of the first cell at the correct time, and enables the terminal device and the first cell to have consistent system information. This avoids the terminal device failing to receive the public information of the first cell or failing to access the first cell due to inconsistent system information.

[0257] In some embodiments, the first indication information includes at least one of the following:

[0258] The first information indicating a change in system information;

[0259] The second message indicating the change of on-demand SIB1;

[0260] ETWS and CMAS notification information.

[0261] In some embodiments, the first indication information includes either the first information or the second information;

[0262] The first acquisition unit 1402 acquires the updated on-demand SIB1 in the next modification cycle or in the first time window; or,

[0263] The first acquisition unit 1402 begins acquiring the updated on-demand SIB1 at a predetermined start time; or,

[0264] The first acquisition unit 1402 stops acquiring the updated on-demand SIB1 at a predetermined end time.

[0265] In some embodiments, the first acquisition unit 1402 begins to acquire the updated on-demand SIB1 at a first moment at the start of the next modification cycle, or at a second moment corresponding to a first offset time T1 after the start of the next modification cycle.

[0266] The first offset time T1 is configured or predefined by the network device.

[0267] In some embodiments, the first acquisition unit 1402 is further configured to:

[0268] At the third moment after the end of the next modification cycle, or at the fourth moment corresponding to the second offset time T2 before the end of the next modification cycle, or at the fifth moment corresponding to the third offset time T3 after the end of the next modification cycle, the acquisition of updated on-demand SIB1 is stopped.

[0269] The second offset time T2 and the third offset time T3 are configured or predefined by the network device.

[0270] In some embodiments, the first time window is a time window for PDCCH monitoring; and / or

[0271] The first time window is the time window for receiving the on-demand SIB1 of the first cell.

[0272] In some embodiments, the first time window overlaps with the current modification period; or

[0273] The first time window does not overlap with the current modification period; or

[0274] The first time window overlaps with the next modification cycle; or

[0275] The first time window does not overlap with the next modification cycle; or

[0276] The first time window overlaps with both the current modification cycle and the next modification cycle.

[0277] In some embodiments, the first acquisition unit 1402 is further configured to:

[0278] Obtain the on-demand SIB1 before the update during the time window that overlaps with the current modification cycle, and obtain the updated on-demand SIB1 during the time window that overlaps with the next modification cycle; or

[0279] Obtain the updated on-demand SIB1 within the first time window.

[0280] In some embodiments, the start position and / or length and / or end position of the first time window are configured or predefined by the network device.

[0281] In some embodiments, the predetermined start time and / or the predetermined stop time are pre-configured or predefined by the network device, or dynamically indicated by the network device.

[0282] In some embodiments, the first acquisition unit 1402 is further configured to:

[0283] Obtain the on-demand SIB1 before the update during the time when the on-demand SIB1 is sent on the first cell and overlaps with the current modification period; obtain the updated on-demand SIB1 during the time when the on-demand SIB1 is sent on the first cell and overlaps with the next modification period; or

[0284] The updated on-demand SIB1 is obtained during the time when the on-demand SIB1 is sent on the first cell.

[0285] In some embodiments, the first indication information includes the ETWS and CMAS notifications.

[0286] Upon receiving the ETWS and CMAS notification information, the first acquisition unit immediately acquires the on-demand SIB1 of the first cell.

[0287] In some embodiments, the first acquisition unit 1402 acquires the on-demand SIB1 of the first cell in a third time window;

[0288] The start time of the third time window is the sixth moment when the first indication information containing the ETWS and CMAS notification information sent by the first cell is received, or the seventh moment before the sixth moment or the eighth moment after the sixth moment;

[0289] The length of the seventh time point and / or the eighth time point and / or the third time window is pre-configured or predefined by the network device; and / or

[0290] The end time of the third time window is either pre-configured or pre-defined by the network device, or dynamically indicated by the network device.

[0291] In some embodiments, the device 1400 further includes:

[0292] A first transmitting unit (not shown) is used to transmit a wake-up signal (WUS) associated with the on-demand SIB1 of the first cell in order to obtain the on-demand SIB1 of the first cell.

[0293] In some embodiments, the first sending unit sends the WUS upon receiving the first indication information.

[0294] In some embodiments, the first sending unit sends the WUS during the current modification period; or

[0295] The first sending unit sends the WUS in the next modification cycle; or

[0296] The first transmitting unit transmits the WUS without detecting or acquiring the on-demand SIB1 in the first cell.

[0297] In some embodiments, the first acquisition unit acquires the on-demand SIB1 in a second time window.

[0298] In some embodiments, the second time window overlaps with the current modification period; or

[0299] The second time window does not overlap with the current modification period; or

[0300] The second time window overlaps with the next modification cycle; or

[0301] The second time window does not overlap with the next modification cycle; or

[0302] The second time window overlaps with both the current modification cycle and the next modification cycle.

[0303] In some embodiments, the first acquisition unit 1402 is further configured to:

[0304] Obtain the on-demand SIB1 before the update during the time window that overlaps with the current modification cycle, and obtain the on-demand SIB1 after the update during the time window that overlaps with the next modification cycle.

[0305] In some embodiments, the search space and / or coreset for scheduling the PDCCH of the on-demand SIB1 are configured or predefined by the network device.

[0306] In some embodiments, the device 1400 further includes:

[0307] The second processing unit (not shown) is used to delete the stored version of the system information block after a first preset time period from the moment when the validity of the system information block other than on-demand SIB1 of the first cell is confirmed.

[0308] In some embodiments, the system information block of the first cell has a first validity period, and the on-demand SIB1 of the first cell has a second validity period, the second validity period being longer than the first validity period.

[0309] In some embodiments, the device 1400 further includes:

[0310] A third processing unit (not shown) is configured to, after the terminal device receives the on-demand SIB1 of the first cell, consider the on-demand SIB1 of the first cell to be valid if the terminal device does not receive the first indication information; and / or, if the terminal device receives the first indication information, consider the on-demand SIB1 of the first cell to be invalid.

[0311] According to the above embodiments, the terminal device receives first indication information related to the system information change of the first cell, and / or returns to the first cell, and / or reselects to the first cell. Thus, when the terminal device receives the first indication information and / or returns to the first cell and / or reselects to the first cell, it can obtain the system information block type one (on-demand SIB1) of the first cell on the first cell. This helps the terminal device to obtain the on-demand SIB1 of the first cell at the correct time, and enables the terminal device and the first cell to have consistent system information. This avoids the terminal device failing to receive the public information of the first cell or failing to access the first cell due to inconsistent system information.

[0312] The implementation and terminology of this embodiment are similar to those of the embodiment of the first aspect of this application. The relevant content above is incorporated herein and will not be repeated here.

[0313] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0314] It is worth noting that the above description only covers the steps relevant to this application, but this application is not limited thereto. The information acquisition device of this application may also include other units / modules, and for details regarding these units / modules, please refer to related technologies.

[0315] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0316] Fourth aspect of the embodiment

[0317] This application provides an information sending device, applied / configured in a network device. This information sending device is based on the same inventive concept as the information acquisition method in the first aspect and the information sending method in the second aspect of this application, and the principle of solving the problem is similar. Therefore, the implementation of the information sending device is the same as the implementation of the information acquisition method in the first aspect and the information sending method in the second aspect of this application, and repeated details will not be described again. The terms "unit" or "module" used below can refer to a combination of software and / or hardware that implements a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0318] Figure 15 is a schematic diagram of an information transmission device according to an embodiment of this application. As shown in Figure 15, the device 1500 includes:

[0319] The second sending unit 1501 is used to send to the terminal device first indication information related to the system information change of the first cell, and the system information block type one (on-demand SIB1) of the first cell.

[0320] As can be seen from the above embodiments, the network device sends a first indication information related to the change of system information of the first cell to the terminal device. As a result, the terminal device can obtain the system information block type one (on-demand SIB1) of the first cell when it receives the first indication information and / or returns to the first cell and / or reselects to the first cell. This helps the terminal device to obtain the on-demand SIB1 of the first cell at the correct time, and enables the terminal device and the first cell to have consistent system information. This avoids the terminal device failing to receive the public information of the first cell or failing to access the first cell due to inconsistent system information.

[0321] For details related to the operations performed by the second sending unit 1501, please refer to the embodiments of the first and second aspects. The implementation and terminology of this embodiment are similar to those of the embodiments of the first and second aspects of this application. The above content is incorporated herein and will not be repeated here.

[0322] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0323] It is worth noting that the above description only covers the steps relevant to this application, but this application is not limited thereto. The information transmission device of this application may also include other units / modules, and for details regarding the content of these units / modules, please refer to related technologies.

[0324] The above embodiments are merely illustrative examples of embodiments of this application, but this application is not limited thereto, and appropriate modifications can be made based on the above embodiments. For example, the above embodiments can be used alone, or one or more of the above embodiments can be combined.

[0325] Fifth aspect of the embodiment

[0326] This application provides a communication system, which, as shown in FIG1, includes a network device 101, a terminal device 102, and a terminal device 103.

[0327] In this embodiment of the application, terminal device 102 and / or terminal device 103 are configured to perform the information acquisition method in the first aspect of the application. For example, terminal device 102 and / or terminal device 103 receive first indication information related to the system information change of the first cell, and / or return to the first cell, and / or reselect to the first cell; and the terminal device acquires the system information block type one (on-demand SIB1) of the first cell on the first cell. The above related content is incorporated into this and will not be repeated here.

[0328] In this embodiment of the application, network device 101 is configured to execute the information transmission method in the second aspect of the application. For example, network device 101 sends a first indication information related to the system information change of the first cell and the system information block type one (on-demand SIB1) of the first cell to the terminal device. The above related content is incorporated here and will not be repeated here.

[0329] Implementation of the sixth aspect

[0330] This application provides a terminal device.

[0331] Figure 16 is a schematic diagram of the configuration of a terminal device according to an embodiment of this application. The terminal device may be a remote terminal device. As shown in Figure 16, the terminal device 1600 may include a processor 1601 and a memory 1602; the memory 1602 stores data and programs and is coupled to the processor 1601. It is worth noting that this figure is exemplary; other types of structures may also be used to supplement or replace this structure to implement telecommunications functions or other functions.

[0332] For example, processor 1601 may be configured to execute a program to implement the information acquisition method as described in the first aspect of the embodiment. For example, processor 1601 may be configured to perform the following operations: receive first indication information related to a change in system information of a first cell, and / or return to the first cell, and / or reselect to the first cell; and the terminal device acquires the system information block type one (on-demand SIB1) of the first cell on the first cell.

[0333] As shown in Figure 16, the terminal device 1600 may further include: a communication module 1603, an input unit 1604, a display 1605, and a power supply 1606. The functions of these components are similar to those in the prior art and will not be described in detail here. It is worth noting that the terminal device 1600 does not necessarily include all the components shown in Figure 16; these components are not essential. Furthermore, the terminal device 1600 may also include components not shown in Figure 16, which can be referred to in related technologies.

[0334] This application provides a network device, such as a base station, but this application is not limited to this and may also include other network devices.

[0335] Figure 17 is a schematic diagram of the network device according to an embodiment of this application. As shown in Figure 17, the network device 1700 may include: a processor 1710 (e.g., a central processing unit CPU) and a memory 1720; the memory 1720 is coupled to the processor 1710. The memory 1720 can store various data; in addition, it also stores an information processing program 1730, and executes the program 1730 under the control of the processor 1710.

[0336] For example, processor 1710 may be configured to execute a program to implement the information transmission method as described in the second aspect of the embodiment. For example, processor 1710 may be configured to perform the following control: send to a terminal device first indication information related to a change in system information of a first cell, and system information block type one (on-demand SIB1) of the first cell.

[0337] In addition, as shown in Figure 17, network device 1700 may also include: transceiver 1740 and antenna 1750, etc.; the functions of the above components are similar to those in the prior art, and will not be described in detail here. It is worth noting that network device 1700 does not necessarily have to include all the components shown in Figure 17; in addition, network device 1700 may also include components not shown in Figure 17, which can be referred to in the prior art.

[0338] This application also provides a computer-readable program, wherein when the program is executed in a terminal device, the program causes the computer to perform the information acquisition method described in the first aspect embodiment of this application in the terminal device.

[0339] This application also provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the information acquisition method described in the first aspect of this application in a terminal device.

[0340] This application also provides a computer-readable program, wherein when the program is executed in a network device, the program causes the computer to perform the information sending method described in the second aspect embodiment of this application in the network device.

[0341] This application also provides a storage medium storing a computer-readable program, wherein the computer-readable program causes a computer to execute the information transmission method described in the second aspect of this application in a network device.

[0342] The apparatus and methods described above in this application can be implemented in hardware or in combination with software. This application relates to a computer-readable program that, when executed by a logic component, enables the logic component to implement the apparatus or components described above, or to implement the various methods or steps described above. This application also relates to storage media for storing the above programs, such as hard disks, magnetic disks, optical disks, DVDs, flash memory, etc.

[0343] The methods / apparatus described in conjunction with the embodiments of this application can be directly embodied in hardware, software modules executed by a processor, or a combination of both. For example, one or more and / or combinations of one or more functional block diagrams shown in the figures can correspond to various software modules in a computer program flow, or to various hardware modules. These software modules can correspond to the various steps shown in the figures, respectively. These hardware modules can be implemented, for example, using a field-programmable gate array (FPGA) to embed these software modules.

[0344] The software module can reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art. A storage medium can be coupled to the processor, enabling the processor to read information from and write information to the storage medium; or the storage medium can be an integral part of the processor. The processor and storage medium can reside in an ASIC. The software module can be stored in the memory of a mobile terminal or in a memory card that can be inserted into the mobile terminal. For example, if the device (such as a mobile terminal) uses a high-capacity MEGA-SIM card or a high-capacity flash memory device, the software module can be stored in the MEGA-SIM card or the high-capacity flash memory device.

[0345] One or more and / or one or more combinations of functional blocks described in the accompanying drawings can be implemented as a general-purpose processor, digital signal processor (DSP), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, or any suitable combination thereof for performing the functions described herein. One or more and / or one or more combinations of functional blocks described in the accompanying drawings can also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in communication with a DSP, or any other such configuration.

[0346] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.

[0347] Regarding the implementation methods including the above embodiments, the following notes are also disclosed:

[0348] 1. An information processing method applied to a terminal device, wherein the method includes:

[0349] The terminal device deletes the stored version of the system information block after a first preset time period starting from the moment when the system information block other than on-demand SIB1 of the first cell is confirmed to be valid.

[0350] 2. An information processing method applied to a terminal device, wherein the method includes:

[0351] The terminal device receives the system information block of the first cell;

[0352] The system information block of the first cell has a first valid duration, and the on-demand SIB1 of the first cell has a second valid duration, which is longer than the first valid duration.

[0353] 3. An information processing method applied to a terminal device, wherein the method includes:

[0354] After the terminal device receives the on-demand SIB1 from the first cell,

[0355] If the terminal device does not receive the first indication information related to the system information change of the first cell, the on-demand SIB1 of the first cell is considered valid; and / or

[0356] If the terminal device receives the first indication information, it considers the on-demand SIB1 of the first cell to be invalid.

[0357] 4. An information acquisition method, applied to a terminal device, the method comprising:

[0358] The terminal device camps in the first cell that supports or uses on-demand system information block type one (on-demand SIB1);

[0359] The terminal device receives first information related to the wake-up signal (WUS) configuration of the first cell on the first cell.

[0360] 5. According to the method described in Appendix 4, wherein,

[0361] The first information includes the WUS configuration information of the first cell;

[0362] The first information is contained in the System Information Block (SIB) of the first cell.

[0363] 6. According to the method described in Appendix 5, wherein,

[0364] The first information is contained in the on-demand SIB1 of the first cell;

[0365] The terminal device acquires on-demand SIB1, which includes the first information, on the first cell during the next modification cycle or the first time period.

[0366] The start time and / or length and / or end time of the first time period are configured by the network device or predefined.

[0367] 7. According to the method described in Appendix 5, wherein,

[0368] The first information is contained in the second system information block of the first cell, which is different from on-demand SIB1;

[0369] The terminal device receives second information on the first cell during the current modification period or the second time period, and the second information includes system information change indication information of the first cell.

[0370] Send WUS to the first cell;

[0371] On the first cell, obtain the on-demand SIB1 of the first cell during the current modification period or the second time period;

[0372] Based on the scheduling information in the on-demand SIB1, a second information block including the first information is acquired on the first cell starting from the modification period after the current modification period.

[0373] 8. According to the method described in Appendix 1, wherein,

[0374] The first information includes indication information, which indicates whether the WUS configuration information of the first cell has changed.

[0375] 9. According to the method described in Appendix 8, wherein,

[0376] The first information is contained in the Download Control Information (DCI) of the short message used for paging, or in the DCI corresponding to the Paging Early Indication (PEI), or in the paging message.

[0377] 10. The method according to Appendix 9, wherein,

[0378] Different values ​​of the indication information indicate whether the WUS configuration information of the first cell has changed;

[0379] The presence or absence of the indicated information indicates whether the WUS configuration information of the first cell has changed.

Claims

1. An information acquisition device, configured in a terminal device, the device comprising: The first processing unit is configured to receive first indication information related to a change in system information of the first cell, and / or return to the first cell, and / or reselect to the first cell; The first acquisition unit is used by the terminal device to acquire the system information block type one (on-demand SIB1) of the first cell.

2. The apparatus according to claim 1, wherein, The first indication information includes at least one of the following: The first information indicating a change in system information; The second message indicating the change of on-demand SIB1; ETWS and CMAS notification information.

3. The apparatus according to claim 2, wherein, The first indication information includes either the first information or the second information; The first acquisition unit acquires the updated on-demand SIB1 in the next modification cycle or in the first time window; or, The first acquisition unit begins acquiring the updated on-demand SIB1 at a predetermined start time; or, The first acquisition unit stops acquiring updated on-demand SIB1 at a predetermined end time.

4. The apparatus according to claim 3, wherein, The first acquisition unit begins to acquire the updated on-demand SIB1 at the first moment of the start of the next modification cycle, or at the second moment corresponding to the first offset time T1 after the start of the next modification cycle. The first offset time T1 is configured or predefined by the network device.

5. The apparatus according to claim 3, wherein, The first acquisition unit is further configured to: At the third moment after the end of the next modification cycle, or at the fourth moment corresponding to the second offset time T2 before the end of the next modification cycle, or at the fifth moment corresponding to the third offset time T3 after the end of the next modification cycle, the acquisition of updated on-demand SIB1 is stopped. The second offset time T2 and the third offset time T3 are configured or predefined by the network device.

6. The apparatus according to claim 3, wherein, The first time window is the time window for PDCCH monitoring; and / or The first time window is the time window for receiving the on-demand SIB1 of the first cell.

7. The apparatus according to claim 6, wherein, The first acquisition unit is further configured to: During the time window that overlaps with the current modification cycle, obtain the on-demand SIB1 before the update, and during the time window that overlaps with the next modification cycle, obtain the updated on-demand SIB1. or Get the updated on-demand SIB1 in the first time window.

8. The apparatus according to claim 3, wherein, The start position and / or length and / or end position of the first time window are configured or predefined by the network device.

9. The apparatus according to claim 3, wherein, The predetermined start time and / or the predetermined stop time are pre-configured or predefined by the network device, or dynamically indicated by the network device.

10. The apparatus according to claim 2, wherein, The first indication information includes the ETWS and CMAS notification information. Upon receiving the ETWS and CMAS notification information, the first acquisition unit immediately acquires the on-demand SIB1 of the first cell.

11. The apparatus according to claim 10, wherein, The first acquisition unit acquires the on-demand SIB1 of the first cell in the second time window; The start time of the second time window is the sixth moment when the first indication information containing the ETWS and CMAS notification information is received from the first cell, or the seventh moment before the sixth moment or the eighth moment after the sixth moment; The length of the seventh time point and / or the eighth time point and / or the second time window is pre-configured or predefined by the network device; and / or The end time of the second time window is either pre-configured or predefined by the network device, or dynamically indicated by the network device.

12. The apparatus according to any one of claims 1 to 11, wherein, The device further includes: The first transmitting unit is used to transmit a wake-up signal related to the on-demand SIB1 of the first cell. (wake up signal, WUS) to obtain the on-demand SIB1 of the first cell.

13. The apparatus according to claim 12, wherein, When the first sending unit receives the first indication information, it sends the WUS.

14. The apparatus according to claim 12, wherein, The first acquisition unit acquires the on-demand SIB1 in the third time window.

15. The apparatus according to claim 1, wherein, The search space and / or coreset for scheduling the on-demand SIB1 PDCCH are configured or predefined by the network device.

16. The apparatus according to claim 1, wherein, The device further includes: The second processing unit is configured to delete the stored version of the system information block after a first preset time period from the moment when the validity of the system information block other than on-demand SIB1 of the first cell is confirmed.

17. The apparatus according to claim 1, wherein, The system information block of the first cell has a first valid duration, and the on-demand SIB1 of the first cell has a second valid duration, which is longer than the first valid duration.

18. The apparatus according to claim 1, wherein, The device further includes: The third processing unit is configured to, after the terminal device receives the on-demand SIB1 of the first cell, consider the on-demand SIB1 of the first cell to be valid if the terminal device does not receive the first indication information; and / or, consider the on-demand SIB1 of the first cell to be invalid if the terminal device receives the first indication information.

19. An information transmission device configured in a network device, the device comprising: The second sending unit is used to send to the terminal device first indication information related to the system information change of the first cell, and system information block type one (on-demand SIB1) of the first cell.

20. A communication system, the communication system comprising: A network device for sending a first indication message related to a change in system information of a first cell, and a system information block type one (on-demand SIB1) of the first cell to a terminal device; A terminal device is configured to receive the first indication information, and / or return to the first cell, and / or reselect to the first cell, and obtain the on-demand SIB1 of the first cell.

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