System information transmission method and apparatus

Abstract

A system information transmission method and an apparatus. The method comprises: receiving first system information from a network device, the first system information being used for indicating basic information required for communications, the first system information further being used for scheduling first subsystem information, and the first subsystem information being related to a first feature; if it is determined that the first feature is supported, acquiring the first subsystem information on the basis of the first system information; and, on the basis of the first system information and the first subsystem information, communicating with the network device. In the method, the system information (such as the first subsystem information) related to the first feature is individually sent, so that the first system information and the system information related to the first feature are sent separately, and only a terminal device supporting the first feature receives and saves the first subsystem information, thereby improving the flexibility of system information transmission.

Description

System information transmission method and device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of the People's Republic of China on January 22, 2024, with application number 202410094591.7 and invention name "A System Information Transmission Method and Device", the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of communication technology, and in particular to a system information transmission method and device. Background Art

[0004] In mobile communication systems, base stations need to broadcast a cell's system information (SI) so that terminal devices can access the cell and operate normally within it. System information primarily consists of a master information block (MIB) and a system information block (SIB). Fourteen types of SIBs are defined: SIB type 1 through SIB type 21, referred to as SIB1, SIB2, ..., SIB21. SIBs other than SIB1 are also referred to as other system information (OSI).

[0005] As mobile communication systems evolve, they will introduce multiple features, such as non-terrestrial networks (NTN) and extended reality (XR). Terminal devices supporting different features may require different system information when accessing a cell. Therefore, existing system information cannot meet future needs. With the introduction of multiple features in the network, how to transmit system information is a pressing issue. Summary of the Invention

[0006] The present application provides a system information transmission method and apparatus to improve the flexibility of system information transmission.

[0007] In a first aspect, the present application provides a system information transmission method, wherein the execution subject of the method is a terminal device or a module or chip on the terminal device side. The method is described here using the terminal device as the execution subject as an example. The method includes: receiving first system information from a network device; the first system information is used to indicate basic information required for communication, the first system information is also used to schedule first subsystem information, and the first subsystem information is related to a first feature; if it is determined that the first feature is supported, obtaining the first subsystem information based on the first system information; and communicating with the network device based on the first system information and the first subsystem information.

[0008] Through the method provided in this application, the system information related to the first feature (such as the first subsystem information) is sent separately, and the first system information and the system information related to the first feature are sent separately. Only the terminal device that supports the first feature receives and saves the first subsystem information, thereby improving the flexibility of system information sending and improving communication efficiency.

[0009] In a possible implementation, if it is determined that the first feature is not supported, the first subsystem information is ignored.

[0010] Through this method, terminal devices that do not support the first feature may not save the first subsystem information. In this way, for terminal devices that do not support the first feature, there is no need to save system information related to the first feature, which reduces the overhead of system information and improves communication efficiency.

[0011] In one possible implementation, the method further includes: receiving second system information and second subsystem information, where the second system information is used to indicate other basic information required for communication; the second subsystem information is related to the first characteristic, and the second subsystem information and the first subsystem information include different information.

[0012] In one possible implementation, the first subsystem information indicates proprietary information required for a terminal device supporting the first feature to access the network; the second subsystem information is used to indicate at least one of the following: proprietary information required for a terminal device supporting the first feature to perform intra-frequency cell reselection, inter-frequency cell reselection, and inter-system cell reselection; proprietary intra-frequency cell reselection parameters and a blacklist of proprietary intra-frequency cells required for a terminal device supporting the first feature to perform intra-frequency cell reselection; proprietary inter-frequency frequency point reselection parameters, proprietary inter-frequency cell reselection parameters, and a blacklist of proprietary inter-frequency cells required for a terminal device supporting the first feature to perform inter-frequency cell reselection; proprietary related information for a terminal device supporting the first feature to perform system EUTRA reselection.

[0013] In a possible implementation manner, the first system information further indicates a correspondence between the first subsystem information and the first characteristic.

[0014] In a possible implementation manner, the second system information and the second subsystem information are located in different system information messages.

[0015] In a possible implementation manner, the second subsystem information is located in a system information message, and a starting symbol a of a system information window associated with the system information message satisfies: a=x mod N;

[0016] The system frame number SFN of the radio frame where the system information window associated with the system information message resides satisfies: SFN mod T = FLOOR (x / N);

[0017] Where x = (n*α-1) × w or x = (n-1) × w + L off1 ; α is a number greater than 1, L off1 is an integer greater than 0, n is determined according to the position order of the system information message in the system information message list included in the first system information, T is the period of the system information message, N is the number of symbols included in a radio frame, w is the length of the system information window associated with the system information message, mod is a modulo operation, and FLOOR() is a floor operation.

[0018] In a possible implementation manner, the second subsystem information is located in a system information message, and a starting symbol a of a system information window associated with the system information message satisfies: a=x mod N;

[0019] The system frame number SFN of the radio frame where the system information window associated with the system information message is located satisfies: SFN mod T = FLOOR (x / N) + L off2 ;

[0020] Where x = (n-1) × w; L off2 is an integer greater than 0, T is the period of the system information message, n is determined according to the position order of the system information message in the system information message list included in the first system information, N is the number of symbols included in a radio frame, w is the length of the system information window associated with the system information message, mod is a modulo operation, and FLOOR() is a floor operation.

[0021] In a possible implementation manner, the first system information further includes a value tag corresponding to the first characteristic, where the value tag is used to indicate whether the system information corresponding to the first characteristic is updated.

[0022] Through the value tag corresponding to the first characteristic, the terminal device can determine whether the system information corresponding to the first characteristic is updated, and thus can determine whether to receive the updated system information based on the value tag corresponding to the first characteristic.

[0023] In a possible implementation, the method further includes: receiving first update indication information from the network device, where the first update indication information is used to indicate that system information related to a feature is updated.

[0024] In a possible implementation manner, the first update indication information is located in a short message, a DCI, or a paging message.

[0025] In a possible implementation manner, the method further includes: receiving second update indication information from the network device, where the second update indication information is used to indicate that system information related to the first feature is updated.

[0026] In this implementation, since each feature corresponds to an update indication information, when the system information related to a feature is updated, only the terminal device that supports the feature receives the updated system information. Other terminal devices can ignore the system information related to the feature, or not read the system information related to the feature, thereby reducing the power consumption of the terminal device.

[0027] In a possible implementation manner, the method further includes: receiving updated first subsystem information.

[0028] In a possible implementation manner, the second update indication information is located in a short message, a DCI, or a paging message.

[0029] In one possible implementation, the method further includes: receiving a paging message from the network device, the paging message being used to indicate that system information related to the first characteristic has been updated; wherein the paging message is encrypted using a P-RNTI corresponding to the first characteristic, or the paging timing of the paging message is determined based on identification information of the first characteristic.

[0030] Since the paging timing of the paging message corresponding to each feature is determined according to the identification information of the feature, for the terminal device supporting the first feature, it is not necessary to monitor the paging messages in all possible POs, but only needs to monitor the paging messages in the PO determined according to the identification information of the first feature, thereby reducing the number of paging messages that need to be monitored and saving power consumption of the terminal device.

[0031] In a second aspect, the present application provides a system information transmission method, wherein the method is performed by a network device or a module or chip on the network device side. The method is described herein using the network device as the example. The method comprises: sending first system information; the first system information is used to indicate basic information required for communication, the first system information is also used to schedule first subsystem information, the first subsystem information being related to a first characteristic; and sending the first subsystem information according to the first system information.

[0032] In one possible implementation, the method further includes: sending second system information and second subsystem information, where the second system information is used to indicate other basic information required for communication; the second subsystem information is related to the first characteristic, and the second subsystem information and the first subsystem information include different information.

[0033] In one possible implementation, the first subsystem information indicates proprietary information required for a terminal device supporting the first feature to access the network; the second subsystem information is used to indicate at least one of the following: proprietary information required for a terminal device supporting the first feature to perform intra-frequency cell reselection, inter-frequency cell reselection, and inter-system cell reselection; proprietary intra-frequency cell reselection parameters and a blacklist of proprietary intra-frequency cells required for a terminal device supporting the first feature to perform intra-frequency cell reselection; proprietary inter-frequency frequency point reselection parameters, proprietary inter-frequency cell reselection parameters, and a blacklist of proprietary inter-frequency cells required for a terminal device supporting the first feature to perform inter-frequency cell reselection; proprietary related information for a terminal device supporting the first feature to perform system EUTRA reselection.

[0034] In a possible implementation manner, the first system information further indicates a correspondence between the first subsystem information and the first characteristic.

[0035] In a possible implementation manner, the second subsystem information is located in a system information message, and a starting symbol a of a system information window associated with the system information message satisfies: a=x mod N;

[0036] The system frame number SFN of the radio frame where the system information window associated with the system information message resides satisfies: SFN mod T = FLOOR (x / N);

[0037] Where x = (n*α-1) × w or x = (n-1) × w + L off1 ; α is a number greater than 1, L off1is an integer greater than 0, n is determined according to the position order of the system information message in the system information message list included in the first system information, T is the period of the system information message, N is the number of symbols included in a radio frame, w is the length of the system information window associated with the system information message, mod is a modulo operation, and FLOOR() is a floor operation.

[0038] In a possible implementation manner, the second subsystem information is located in a system information message, and a starting symbol a of a system information window associated with the system information message satisfies: a=x mod N;

[0039] The system frame number SFN of the radio frame where the system information window associated with the system information message is located satisfies: SFN mod T = FLOOR (x / N) + L off2 ;

[0040] Where x = (n-1) × w; L off2 is an integer greater than 0, T is the period of the system information message, n is determined according to the position order of the system information message in the system information message list included in the first system information, N is the number of symbols included in a radio frame, w is the length of the system information window associated with the system information message, mod is a modulo operation, and FLOOR() is a floor operation.

[0041] In a possible implementation manner, the first system information further includes a value tag corresponding to the first characteristic, where the value tag is used to indicate whether the system information corresponding to the first characteristic is updated.

[0042] In a possible implementation, the method further includes: sending first update indication information, where the first update indication information is used to indicate that system information related to the feature is updated.

[0043] In a possible implementation manner, the first update indication information is located in a short message, a DCI, or a paging message.

[0044] In a possible implementation manner, the method further includes: receiving second update indication information from the network device, where the second update indication information is used to indicate that system information related to the first feature is updated.

[0045] In a possible implementation manner, the method further includes: sending updated first subsystem information.

[0046] In a possible implementation manner, the second update indication information is located in a short message, a DCI, or a paging message.

[0047] In one possible implementation, the method further includes: sending a paging message, wherein the paging message is used to indicate that system information related to the first characteristic is updated; wherein the paging message is encrypted using a P-RNTI corresponding to the first characteristic, or the paging timing of the paging message is determined based on identification information of the first characteristic.

[0048] In a third aspect, the present application further provides a communication device capable of implementing any of the methods provided in any of the first to second aspects above. The communication device may be implemented in hardware or by executing corresponding software implementations in hardware. The hardware or software includes one or more units or modules corresponding to the above functions.

[0049] In one possible implementation, the communication device includes a processor configured to support the communication device in executing the corresponding functions of the network device, terminal device, or core network device in the above-described method. The communication device may also include a memory, which may be coupled to the processor and stores program instructions and data necessary for the communication device. Optionally, the communication device also includes an interface circuit for supporting communication between the communication device and a device such as a terminal device.

[0050] In one possible implementation, the communication device includes corresponding functional modules for implementing the steps in the above method. The functions can be implemented by hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

[0051] In one possible implementation, the structure of the communication device includes a processing unit and a communication unit, which can perform the corresponding functions in the above method examples. For details, please refer to the description of the method provided in any one of the first aspect to the second aspect, which will not be repeated here.

[0052] In a fourth aspect, a communication device is provided, comprising a processor and an interface circuit, wherein the interface circuit is configured to receive signals from a communication device other than the communication device and transmit them to the processor, or to transmit signals from the processor to the communication device other than the communication device, wherein the processor implements the functional modules of the method in any possible implementation of any of the first and second aspects by means of logic circuits or by executing computer programs or instructions. Optionally, the communication device further comprises a memory configured to store the computer program or instructions.

[0053] In a fifth aspect, a computer-readable storage medium is provided, which stores a computer program or instruction. When the computer program or instruction is executed by a processor, the method in any possible implementation of any one of the first to second aspects is implemented.

[0054] In a sixth aspect, a computer program product storing instructions is provided, which, when read and executed by a computer, implements the method in any possible implementation of any one of the first to second aspects.

[0055] In a seventh aspect, a circuit is provided, which is used to execute the method in any possible implementation of any one of the first to second aspects above, and the circuit may include a chip circuit. Optionally, the circuit may also be coupled to a memory.

[0056] In an eighth aspect, a chip is provided, comprising a processor. When the processor executes a computer program or instruction, the processor is configured to implement the method of any possible implementation of any of the first and second aspects. Optionally, the chip may further include a memory. The chip may be composed of a single chip or may include a chip and other discrete devices.

[0057] In a ninth aspect, a communication device is provided, comprising a processor, which implements the method in any possible implementation of any one of the first to second aspects through a logic circuit or by executing a computer program or instruction.

[0058] In a tenth aspect, a communication device is provided, comprising a unit or module for executing the method in any possible implementation of any one of the first to second aspects above.

[0059] In an eleventh aspect, embodiments of the present application further provide a communication system. The communication system includes: a terminal device for implementing the method in the aforementioned first aspect and any possible implementation of the first aspect; and a network device for implementing the method in the aforementioned second aspect and any possible implementation of the second aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] FIG1 is a schematic diagram of a network device architecture provided by an embodiment of the present application;

[0061] FIG2 is a schematic diagram of a network architecture applicable to an embodiment of the present application;

[0062] FIG3 is a schematic diagram of a network architecture applicable to an embodiment of the present application;

[0063] FIG4 is a schematic diagram of a network architecture applicable to an embodiment of the present application;

[0064] FIG5 is a schematic diagram of a flow chart of a system information transmission method provided in an embodiment of the present application;

[0065] FIG6 is a schematic diagram of an SI message window provided in an embodiment of the present application;

[0066] FIG7 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0067] FIG8 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0068] FIG9 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0069] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described are only a part of the embodiments of the present application, not all of the embodiments. The terms "first", "second" and corresponding terminology labels in the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances. This is merely a way of distinguishing objects with the same properties when describing the embodiments of the present application. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, so that a process, method, system, product or device that includes a series of units is not necessarily limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or devices. The methods and devices provided in the embodiments of the present application are based on the same or similar technical concepts. Since the principles of solving problems by the methods and devices are similar, the implementation of the devices and methods can refer to each other, and the repetitions will not be repeated.

[0070] The method provided in the embodiment of the present application can be applied to various mobile communication systems, for example, the Internet of Things (IoT), narrowband Internet of Things (NB-IoT), a fourth generation (4G) communication system (such as long term evolution (LTE)), a fifth generation (5G) communication system (such as 5G new radio (NR)), a hybrid architecture of LTE and NR, 6G or new communication systems emerging in future communication developments, etc. The communication system may also include a machine to machine (M2M) network, a machine type communication (MTC) or other networks.

[0071] Below, some terms used in the embodiments of the present application are first explained to facilitate understanding by those skilled in the art.

[0072] In the embodiments of the present application, the network device may be a device in a wireless network, and the network device may also be referred to as a network apparatus, a radio access network device, or an access network device. For example, the network device may be a radio access network (RAN) node that connects a terminal device to a wireless network, and may also be referred to as an access network device. Network equipment includes but is not limited to: base stations, evolved NodeBs (eNodeBs), transmission reception points (TRPs), next generation NodeBs (gNBs) in fifth generation (5G) mobile communication systems, access network equipment in open radio access networks (O-RANs), next generation base stations in sixth generation (6G) mobile communication systems, base stations in future mobile communication systems, or access nodes in wireless fidelity (WiFi) systems, etc.; or it may be a module or unit that completes part of the functions of a base station, for example, a centralized unit (CU), a distributed unit (DU), a centralized unit control plane (CU-CP) module, or a centralized unit user plane (CU-UP) module. The access network equipment may be a macro base station, a micro base station, an indoor station, a relay node, a donor node, etc. The specific technology and specific device form adopted by the network equipment are not limited in this application.

[0073] As shown in Figure 1, in some implementations, network equipment may include a centralized unit (CU) and / or a distributed unit (DU). RAN equipment, including CU and DU nodes, splits the protocol layers of the gNB in ​​the NR system, centrally controlling some protocol layer functions within the CU and distributing some or all of the remaining protocol layer functions within the DU, which is then centrally controlled by the CU. Furthermore, the CU can be divided into a control plane (CU-CP) and a user plane (CU-UP). The CU-CP is responsible for control plane functions, primarily including radio resource control (RRC) and the control plane's corresponding packet data convergence protocol (PDCP) (i.e., PDCP-C). PDCP-C is primarily responsible for encryption, decryption, integrity protection, and data transmission of control plane data. The CU-UP is responsible for user plane functions, primarily including the service data adaptation protocol (SDAP) and the user plane's corresponding PDCP (i.e., PDCP-U). SDAP is primarily responsible for processing core network data and mapping flows to bearers. The PDCP-U is primarily responsible for data plane encryption and decryption, integrity protection, header compression, sequence number maintenance, and data transmission. The CU-CP and CU-UP are connected via the E1 interface. The CU-CP represents the gNB's connection to the core network via the NG interface and to the DU via the F1 interface control plane (i.e., F1-C). The CU-UP connects to the DU via the F1 interface user plane (i.e., F1-U). Alternatively, the PDCP-C may also reside in the CU-UP.

[0074] It is understandable that in different systems, CU (including CU-CP or CU-UP) or DU may have different names, but those skilled in the art can understand their meanings. For example, in an open radio access network (O-RAN) system, CU may also be called O-CU (open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, and CU-UP may also be called O-CU-UP. For convenience of description, this application uses CU, CU-CP, CU-UP and DU as examples. The network device may also include an active antenna unit (AAU). The CU implements some functions of the gNB, and the DU implements some functions of the gNB. For example, the CU is responsible for processing non-real-time protocols and services and implementing the functions of the RRC layer. The DU is responsible for processing physical layer protocols and real-time services and implementing the functions of the radio link control (RLC) layer, the media access control (MAC) layer and the physical (PHY) layer. In some deployments, the CU can be further divided into a Centralized Unit Control Plane (CU-CP) node and a Centralized Unit User Plane (CU-UP) node, where the CU-CP is responsible for control plane functions and the CU-UP is responsible for user plane functions.

[0075] The terminal device involved in the embodiments of the present application may be a wireless terminal device capable of receiving scheduling and instruction information from a network device. The terminal device may be referred to as a terminal device, and may also be referred to as user equipment (UE), terminal, mobile station (MS), mobile terminal (MT), etc. The terminal device may be a device that includes wireless communication capabilities (providing voice / data connectivity to the user). For example, a handheld device with wireless connection capabilities, or an in-vehicle device, in-vehicle module, etc. Currently, some examples of terminal devices include: mobile phones, tablet computers, laptop computers, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in the Internet of Vehicles, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, or wireless terminals in smart homes, device-to-device (D2D) communication terminal devices, vehicle-to-everything (V2X) communication terminal devices, smart vehicles, telematics boxes (T-boxes), machine-to-machine / machine-type communications (M2M / MTC) terminal devices, Internet of Things (IoT) The IoT (Internet of Things) terminal devices, etc. For example, the terminal device can be an onboard device, complete vehicle equipment, an onboard module, a vehicle, an onboard unit (OBU), a roadside unit (RSU), a T-box, a chip, or a system on chip (SOC), etc. The above chip or SOC can be installed in the vehicle, OBU, RSU, or T-box. Wireless terminals in industrial control can be cameras, robots, etc. Wireless terminals in smart homes can be TVs, air conditioners, vacuum cleaners, speakers, set-top boxes, etc.The terminal device can also be a V2X device, such as a smart car (or intelligent car), a digital car, an unmanned car (or driverless car or pilotless car or automobile), a self-driving car or autonomous car, a pure electric vehicle (or Battery EV), a hybrid electric vehicle (HEV), a range extended EV (REEV), a plug-in hybrid electric vehicle (PHEV), a new energy vehicle (new energy vehicle), and a roadside unit (RSU). The terminal device can also be a device in device-to-device (D2D) communication, such as an electricity meter, a water meter, etc. In addition, in an embodiment of the present application, the terminal device can also be a terminal device in an IoT system. IoT is an important part of the future development of information technology. Its main technical feature is to connect objects to the network through communication technology, thereby realizing an intelligent network of human-machine interconnection and object-to-object interconnection.

[0076] In this application, predefined content generally refers to information that is defined by standards and does not require additional device configuration. It is pre-recorded / written in the hardware and / or software of the terminal device itself, or it can be understood as not being modifiable by the network device or other terminal devices. Pre-configured content generally refers to information that is pre-recorded / written in the hardware and / or software of the terminal device itself, determined by the equipment manufacturer, and can be modified through software or hardware.

[0077] (Pre) configuration can be divided into network device (pre) configuration and terminal device (pre) configuration. If it is a network device (pre) configuration, it can be (pre) configured through the system information block (SIB) or RRC signaling; if it is a terminal device (pre) configuration, it can be (pre) configured according to PC5-RRC signaling.

[0078] Figure 2 is an exemplary architecture diagram of a communication system 100 applicable to the present application. The methods in the embodiments of the present application can be applied to the communication system 100 shown in Figure 2. It should be understood that the communication system 100 to which the methods in the embodiments of the present application can be applied can include more or fewer network devices or terminal devices.

[0079] The network devices or terminal devices in Figure 2 can be hardware, functionally divided software, or a combination of the two. The network devices or terminal devices in Figure 2 can communicate with each other through other devices or network elements.

[0080] In the communication system 100 shown in Figure 2, a network device 110 and terminal devices 101 to 106 constitute a communication system 100. In this communication system 100, the network device 110 can send downlink data to the terminal devices 101 to 106. Of course, the terminal devices 101 to 106 can also send uplink data to the network device 110. The communication system 100 can be an LTE network or a NR network, a device-to-device (D2D) network, a machine-to-machine (M2M) network, etc.

[0081] In this application, when the network device is a gNB, it may include at least one of the DU, CU-C, and CU-U. In one implementation, as shown in Figure 3, the DU, CU-C, and CU-U can be integrated together as a gNB to provide services to the UE. The CU-C is connected to core network elements such as the access and mobility management function (AMF) through the N2 interface; the CU-U is connected to network elements such as the user plane function (UPF). Figure 3 is only an example, and the CU-C and CU-U can also be combined into one CU entity.

[0082] In another implementation, as shown in Figure 4, some functions of the gNB are incorporated into some network elements of the core network or become independent network elements, and communicate directly with the service bus of the 5G core network (5G core, 5GC). For example, DU, CU-C and CU-U are independent modules, and DU and CU-C are connected to AMF respectively; CU-U is connected to UPF, etc.

[0083] In this application, the DU included in the gNB can be an open DU (open DU, O-DU) under the open radio access network (open radio access network, O-RAN) architecture, and the CU included in the gNB can be an open CU (open CU, O-CU) under the O-RAN architecture.

[0084] System Information (SI) is information broadcast by base stations in a mobile network. By receiving system messages, the terminal device can obtain the basic information required for cell selection when initially accessing the network, parameters for reselection of same-frequency / different-frequency / different-system cells, and other information. The system information described in this application can be the system information sent by the access network device in the cell in 4G or 5G, or it can be the system information sent by the access network device in the cell in a future mobile network, such as the system information sent by the access network device in the cell of 6G or the next generation communication system. This application does not limit the specific content of the system information.

[0085] For example, in the 5G system, SI can be classified into two categories based on content: Minimum System Information (MSI) and Other System Information (OSI). MSI includes MIB and SIB1, which are used to provide the UE with basic information required for cell selection during initial network access and scheduling information from other SIBs.

[0086] MIB: Provides the UE with the most basic information such as whether the cell is prohibited from access and the location information of SIB1.

[0087] SIB1, also known as RMSI (Remaining Minimum System Information), provides the UE with cell access-related information and scheduling information of other SIBs.

[0088] The OSI includes SIB2 to SIBn, which provide UE with information such as mobility, time, Earthquake and Tsunami Warning System (ETWS), and Commercial Mobile Alert System (CMAS).

[0089] SIB2 provides the UE with the public information required for intra-frequency cell reselection, inter-frequency cell reselection, and inter-system cell reselection.

[0090] SIB3 provides the UE with information related to intra-frequency reselection, including intra-frequency cell reselection parameters and a blacklist of intra-frequency cells.

[0091] SIB4 provides the UE with relevant information about inter-frequency reselection, including inter-frequency point reselection parameters, inter-frequency cell reselection parameters, and a blacklist of inter-frequency cells.

[0092] SIB5 provides the UE with information related to the reselection of the evolved universal mobile telecommunications system (UMTS) terrestrial radio access (EUTRA), including frequency reselection parameters, cell reselection parameters, and a blacklist of cells in the heterogeneous system.

[0093] SIB8 provides UE with CMAS (an alarm system in which the government or an authority broadcasts emergency information to the public in real time through PLMN) alarm information.

[0094] SIB9 provides time-related information to the UE, such as high-precision time information for UE-side time synchronization, including Coordinated Universal Time (UTC), Global Positioning System (GPS), and local time.

[0095] The base station can broadcast the MIB periodically. Within a scheduling period (e.g., 80ms), the MIB can be repeatedly transmitted according to the configured Synchronization Signal and PBCH Block (SSB) broadcast period. If the SSB broadcast period is configured to 160ms, the MIB is repeatedly transmitted every 160ms.

[0096] The base station broadcasts SIB1 periodically. Within a scheduling period (eg, 160 ms), SIB1 may be repeatedly sent according to the configured SIB1 broadcast period.

[0097] The base station may broadcast and send the OSI periodically (not repeatedly within a scheduling period), or the base station may broadcast and send the OSI after the UE initiates a subscription request.

[0098] The 3rd Generation Partnership Project (3GPP) standardization and industrialization are driven by release-level granularity. Each release has a standardization cycle of approximately 15 to 18 months and includes multiple features. A feature can refer to a function or capability possessed by a terminal or network device, including but not limited to: ultra-reliable and low-latency communication (URLLC), non-terrestrial network (NTN), vehicle-to-everything (V2X), extended reality (XR), small data transmission (SDT), multi-SIM transmission, low power consumption, flexible spectrum aggregation, reduced capability (Redcap), non-terrestrial network (NTN), multicast broadcast service (MBS), Internet of Things (IoT), and ambient IoT (AIoT).

[0099] For each feature, relevant information is typically carried in system information, allowing terminal devices supporting that feature to access the cell. However, as the number of features increases, the overhead of system information also increases. Each terminal device will receive system information containing information related to various (or all) features. This not only increases the overhead of sending system information on the network side, but also the overhead of receiving system information on the terminal device. Furthermore, the terminal device needs to support interpreting all this information, which increases terminal implementation complexity. This is a problem that needs to be solved urgently.

[0100] When the method provided in the present application is applied to the network architecture in Figure 2, the method executed by the network device can also be executed by a module (such as a chip) in the network device in Figure 2, or by a control subsystem that includes the network device function. The control subsystem that includes the network device function here can be a control center in the above-mentioned application scenarios such as smart grid, industrial control, intelligent transportation, and smart city. The method executed by the terminal device can also be executed by a module (such as a chip or a modem) in the terminal device in Figure 2, or by a device that includes the terminal device function.

[0101] The network architecture and business scenarios described in the embodiments of the present application are intended to more clearly illustrate the technical solutions of the embodiments of the present application, and do not constitute a limitation on the technical solutions provided in the embodiments of the present application. Ordinary technicians in this field will know that with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0102] It can be understood that the present application does not specifically limit the specific structure of the execution subject of the method provided in the embodiment of the present application. It can be applied to modules in terminal devices or network devices. As long as it can communicate according to the method provided in the embodiment of the present application by running a program that records the code of the method provided in the embodiment of the present application, it can be used. The interaction between the terminal device and the network device is used as an example for explanation below.

[0103] In this application, the network side can send public system information, and all terminal devices residing in the current cell can receive public system information. Therefore, for system information design, public system information can allow all terminal devices to have the same interpretation. The content of system information specific to different features can be isolated for different features to achieve decoupling of the system information content of different features. For terminal devices that support a certain feature, they can only receive system information related to that feature, reducing the receiving overhead of system information and improving efficiency.

[0104] FIG5 is a flow chart of a method for transmitting system information according to an embodiment of the present application, wherein the method includes:

[0105] Step 501: The network device sends first system information.

[0106] Correspondingly, the first terminal device receives the first system information from the network device.

[0107] Assuming that there is a second terminal device, the second terminal device can also receive the first system information.

[0108] The network device may periodically send the first system information, for example, periodically and repeatedly send the first system information at a period of 160ms. The period of the first system information may be predefined or preconfigured, or may be determined by the network device, which is not limited in this application.

[0109] In this application, system information may also be referred to as system information block, and subsystem information may also be referred to as subsystem information block. For example, the first system information may also refer to SIB1. As mobile communication technology evolves, the function and / or name of SIB1 may also change. In this case, the first system information may also refer to the SIB1 after the function and / or name change.

[0110] In this application, how the network device sends the first system information is not limited. For example, the network device can broadcast the first system information in the cell. The network device can broadcast the first system information in a preset or predefined resource, which is not limited in this application.

[0111] In this application, first system information is used to indicate basic information required for communication. For example, first system information is used to indicate basic information required for communication between a terminal device and a network device. The basic information referred to here is relative to the first subsystem information associated with the first feature described later. First system information is public system information and is system information that can be used or required by all terminal devices. That is, regardless of which features a terminal device supports, it can use or require the first system information.

[0112] The first system information is also used to schedule first subsystem information. The first subsystem information is related to the first feature. For example, the first subsystem information indicates information related to the first feature and required for communication with the network device. The first subsystem information is system information related to the first feature and is only used or required by terminal devices that support the first feature.

[0113] For example, the first system information is used to indicate the basic information required for initial access and is applicable to all terminal devices. The first subsystem information is used to indicate the basic information required for initial access by terminal devices supporting the first feature and is applicable to terminal devices supporting the first feature. For initial access, terminal devices supporting the first feature need to use a combination of the first system information and the first subsystem information.

[0114] For example, the first system information includes at least one of the following: cell selection information; cell access related information; connection establishment failure control; scheduling information, which is used to schedule the first subsystem information, and the scheduling information can be called SI scheduling information (SI-SchedulingInfo), etc.; serving cell common configuration; Internet Protocol (IP) Multimedia System (IMS) emergency support flag; UE timers and constants; and unified access control (UAC) restriction information. The content included in the first subsystem information is not limited. For example, if the first characteristic is NTN, then the first subsystem information includes at least one of the following: ephemeris information and common timing advance (TA) parameters. For example, if the first characteristic is Redcap, then the first subsystem information includes at least one of the following: Redcap-specific initial BWP configuration.

[0115] Among them, the first system information also indicates the correspondence between the first subsystem information and the first characteristic, so that the terminal device can determine that the first subsystem information is extended information of the system information related to the first characteristic. For example, the scheduling information of the first system information includes information about the first characteristic, such as identification information of the first characteristic, which is used to indicate that the system information scheduled by the scheduling information is related to the first characteristic. The identification information of the first characteristic is preset or preconfigured, for example, the identification information of the IoT characteristic is 1, the identification information of AIoT is 2, the identification information of Redcap is 3, etc. Alternatively, the first system information also includes a bitmap, and one bit in the bitmap corresponds to a characteristic. When the first subsystem information is related to the first characteristic, the value of the bit related to the first characteristic in the bitmap is the first value, for example, the first value is 1; when the first subsystem information is not related to the second characteristic, the value of the bit related to the second characteristic in the bitmap is the second value, for example, the second value is 0.

[0116] In the present application, the scheduling information in the first system information can also be used to schedule other system information. For example, the scheduling information is also used to schedule the second system information and at least one second subsystem information. The second system information is used to indicate other basic information required for communication. The second subsystem information is related to the first characteristic, and the second subsystem information and the first subsystem information include different information. For example, the second system information can also refer to an OSI other than SIB1, such as SIB2 or SIB3. With the evolution of mobile communication technology, the function and / or name of the OSI may also change. In this case, the second system information can also refer to the OSI after the function and / or name change.

[0117] In this application, system information other than the first system information, such as the second system information, the third system information, the first subsystem information, etc., can be encapsulated into an SI message and sent within the SI window corresponding to the SI message. An SI message may include at least one system information. For the scheduling information in the first system information, the scheduling information may indicate at least one of the following:

[0118] SI message list, indicating one or more SI messages scheduled by the scheduling information;

[0119] The period of each SI message;

[0120] System information or subsystem information mapped in each SI message;

[0121] SI window length for each SI message.

[0122] The above are just examples. The scheduling information may also indicate other information, which will not be described one by one here.

[0123] In the present application, the second system information may be used to indicate other information besides the basic information required for initial access. For example, the second system information may be used to indicate at least one of the following information:

[0124] Public information required for intra-frequency cell reselection, inter-frequency cell reselection, and inter-system cell reselection;

[0125] Information related to intra-frequency reselection, such as intra-frequency cell reselection parameters and a blacklist of intra-frequency cells;

[0126] Related information of inter-frequency reselection, such as inter-frequency point reselection parameters, inter-frequency cell reselection parameters, and inter-frequency cell blacklist;

[0127] Related information of EUTRA reselection of different systems, such as frequency reselection parameters of different systems, cell reselection parameters of different systems, and blacklist of cells of different systems.

[0128] In the present application, the first system information and the second system information can be public system information (or basic system information) that all terminal devices need to receive; the first subsystem information and the second subsystem information are system information related to the first feature, and only terminal devices that support the first feature need to receive them. Subsystem information such as the first subsystem information or the second subsystem information can also be called supplementary system information or feature system information or auxiliary system information or extended system information or feature-related system information, etc. This application does not limit the name of the subsystem information.

[0129] This is just an example of the first feature. In this application, for each feature, there may be system information related to that feature, and each type of system information related to that feature may be scheduled by the first system information. For example, for the first system information, there may also be third subsystem information related to the second feature. For example, the third subsystem information is used to indicate information related to the second feature and required for communication with the network device; a terminal device supporting the second feature communicates with the network device based on the first system information and the third subsystem information.

[0130] In this application, the following implementation methods may exist for the extended or enhanced information elements in the feature-related system information. Implementation method 1: For information elements not included in the public system information, if a new information element needs to be introduced for a certain feature, the new information element can be set in the public system information. Only terminal devices that have activated / run / executed the feature can interpret / decode / understand the system information related to the feature and merge it with the content included in the public system information to obtain the complete system information content.

[0131] For example, taking the first characteristic as an example, the first system information does not include supplementary information related to the first characteristic. The supplementary information related to the first characteristic is located in the first subsystem information and is represented in the form of a new independent information element. For example, taking the first characteristic as SDT as an example, the supplementary information related to the SDT characteristic can be represented in the first subsystem information as follows:

[0132] sdt-ConfigCommon-r17 SDT-ConfigCommonSIB-r17 OPTIONAL,--Need R

[0133] Among them, SDT-ConfigCommonSIB-r17 represents the name of the new field: SDT common configuration SIB, and r17 represents the protocol version number for introducing this supplementary information, which can be understood as the configuration of introducing this feature from R17.

[0134] For another example, taking the first characteristic as Redcap, the supplementary information related to the Redcap characteristic may be represented as follows in the first subsystem information:

[0135] redCap-ConfigCommon-r17 RedCap-ConfigCommonSIB-r17 OPTIONAL,--Need R

[0136] Among them, RedCap-ConfigCommonSIB-r17 represents the name of the new field: RedCap common configuration SIB, and r17 represents the protocol version number for introducing this supplementary information, which can be understood as the configuration of introducing this feature from R17.

[0137] Implementation method 2 is to expand the value or content of the existing information element in the public system information. If the value or content of an information element in the public system information can be expanded for a characteristic, such as the first characteristic, then the information element can be retained in the public system information, and the value of the information element is set to a public value range or the content of the information element is public information; the extended value or extended content related to the first characteristic in the information element can be placed in the subsystem information related to the first characteristic, that is, the information element of the subsystem information related to the first characteristic includes the value or content that is additionally extended for the first characteristic, and terminal devices that do not support the first characteristic do not need to interpret the subsystem information related to the first characteristic.

[0138] For example, SI-SchedulingInfo in SIB1 needs to be extended to introduce content specific to Redcap

[0139] SIB1, a public system message, contains SI scheduling information (SI-SchedulingInfo). All terminal devices can receive corresponding information based on this SI scheduling information. Based on the SI scheduling information, SI scheduling information-v1740 (SI-SchedulingInfo-v1740) is added to the system information related to the RedCap feature. SI scheduling information-v1740 includes a new content si-RequestConfigRedCap-r17 for RedCap.

[0140] Step 502: The network device sends first subsystem information.

[0141] Correspondingly, if the first terminal device determines that it supports the first feature, the first terminal device obtains the first subsystem information according to the first system information.

[0142] Specifically, if the first terminal device supports the first feature, the first subsystem information is received according to the scheduling information in the first system information, and the first subsystem information is saved. The first terminal device supporting the first feature can also be described as "the first terminal device has the first feature" or "the first terminal device activates the first feature" or "the first terminal device activates the first feature", etc.

[0143] If the first terminal device determines that it does not support the first feature, the first terminal device ignores the first subsystem information. In this case, the first terminal device may receive the first subsystem information but does not save it. Alternatively, if the first terminal device determines that it does not support the first feature, the first terminal device does not interpret the first subsystem information.

[0144] This application does not limit how the network device sends the first subsystem information. For example, the network device may periodically send the first subsystem information, such as by periodically repeating the first subsystem information at a period of 160 ms. For example, the scheduling information included in the first system information may indicate the period of the first subsystem information.

[0145] Assuming that there is a second terminal device, the second terminal device supports the second feature, the first system information is also used to schedule third subsystem information, and the third subsystem information is used to indicate information required for communication with the network device and related to the second feature, then step 503 can also be included.

[0146] Optionally, step 503: the network device sends third subsystem information.

[0147] Correspondingly, if the second terminal device determines that it supports the second feature, the second terminal device obtains the third subsystem information according to the first system information.

[0148] If the second terminal device determines that it does not support the second feature, the second terminal device ignores the third subsystem information. In this case, the second terminal device may receive the third subsystem information but does not save the third subsystem information.

[0149] The third subsystem information may be scheduled by the first system information. For example, the scheduling information included in the first system information is also used to schedule the third subsystem information.

[0150] Step 504: The first terminal device communicates with the network device according to the first system information and the first subsystem information.

[0151] Optionally, step 505: the second terminal device communicates with the network device according to the first system information and the third subsystem information.

[0152] For example, taking the first characteristic as NTN, the first terminal device can determine the basic information required for initial access to the network device based on the first system information, such as cell selection information, cell access related information, etc. The first terminal device can determine the ephemeris information and public TA parameters based on the first subsystem information. The first terminal device can thus perform uplink synchronization based on the ephemeris information and public TA parameters, and initially access the cell of the network device based on the cell selection information, cell access related information and other information. The specific process will not be repeated here.

[0153] Through the method provided in the present application, by separately sending public system information (such as first system information) and system information related to the first feature (such as first subsystem information), the public system information does not include information related to the feature. The terminal device that supports the first feature receives and saves the first subsystem information, and the terminal device that does not support the first feature (such as the second terminal device) may not save the first subsystem information. In this way, for the terminal device that supports the first feature, there is no need to save system information related to other features, thereby reducing the overhead of system information and improving communication efficiency.

[0154] In this application, each piece of system information may be numbered. There may be multiple implementations for how to configure a number for each piece of system information. Several possible implementations are given below.

[0155] Implementation method 1: Public system information is numbered independently starting from 1. For example, the first system information is numbered SIB1, the second system information is numbered SIB2, the third system information is numbered SIB3, and so on. For each characteristic, a subnumber is configured. For example, the IoT characteristic subnumber is 0, the AIoT subnumber is 1, the Redcap subnumber is 2, the SDT subnumber is 3, and so on. If a subsystem information is an extension of a public system information, the subsystem information number corresponds to the subnumber of the characteristic corresponding to the subsystem information and the public system information number.

[0156] For example, as shown in Table 1, taking the IoT feature sub-number as 0, the AIoT sub-number as 1, the Redcap sub-number as 2, and the SDT sub-number as 3 as an example, the numbers corresponding to the system information and subsystem information are illustrated.

[0157] Table 1

[0158] In combination with the above description, if there is subsystem information related to the IoT characteristics, and the subsystem information is extended information for the first system information, then the subsystem information is numbered SIB1-0; if there is subsystem information related to the IoT characteristics, and the subsystem information is extended information for the second system information, then the subsystem information is numbered SIB2-0; if there is subsystem information related to the IoT characteristics, and the subsystem information is extended information for the third system information, then the subsystem information is numbered SIB3-0.

[0159] Similarly, if there is subsystem information related to the AIoT feature, and this subsystem information is extended information for the first system information, then the subsystem information is numbered SIB1-1; if there is subsystem information related to the AIoT feature, and this subsystem information is extended information for the second system information, then the subsystem information is numbered SIB2-1; if there is subsystem information related to the AIoT feature, and this subsystem information is extended information for the third system information, then the subsystem information is numbered SIB3-1. Other situations are similar and will not be repeated here.

[0160] In implementation method 2, the subnumber for public system information is 0, and the subnumbers for feature-specific subsystem information start at 1. For example, the first system information is numbered SIB1-0, the second system information is numbered SIB2-0, the third system information is numbered SIB3-0, and so on. For each feature, a subnumber is assigned. For example, the IoT feature has a subnumber of 1, the AIoT feature has a subnumber of 2, the Redcap feature has a subnumber of 3, the SDT feature has a subnumber of 4, and so on.

[0161] For example, as shown in Table 2, taking the sub-number of IoT feature as 1, the sub-number of AIoT as 2, the sub-number of Redcap as 3, and the sub-number of SDT as 4 as an example, the numbers corresponding to system information and sub-system information are illustrated.

[0162] Table 2

[0163] Implementation method three: public system information and subsystem information are numbered independently.

[0164] For example, as shown in Table 3, the numbers corresponding to a type of system information and subsystem information are shown.

[0165] Table 3

[0166] In the fourth implementation mode, each subsystem information corresponding to each public system information has the same number.

[0167] For example, as shown in Table 4, the numbers corresponding to system information and subsystem information are shown.

[0168] Table 4

[0169] In this implementation, the scheduling information in the first system information may indicate the characteristics corresponding to the subsystem information scheduled by the scheduling information. For example, the scheduling information includes an identifier of the characteristics corresponding to the subsystem information, so that the terminal device can determine the characteristics corresponding to the subsystem information scheduled by the scheduling information based on the identifier of the characteristics. In addition, in this implementation, multiple subsystem information are associated with a single number, which can reduce the overhead of system information numbering.

[0170] In this application, system information other than the first system information, such as the second system information, the third system information, the first subsystem information, etc., can be encapsulated into an SI message and sent within the SI window corresponding to the SI message. An SI message can include at least one system information.

[0171] In this application, different system information can be mapped into one SI message according to the following mapping rules:

[0172] Only system information with the same period can be mapped into the same SI message;

[0173] Only system information with the same sending strategy (continuous broadcast or subscription) can be mapped to the same SI message;

[0174] Common system information and subsystem information are mapped to different SI messages, for example, the second system information and the second subsystem information are mapped to different SI messages, or subsystem information corresponding to different characteristics are mapped to different SI messages.

[0175] It can also be understood that only system information of the same type (common or feature-related) can be mapped to the same SI message, or only system information corresponding to the same feature can be mapped to the same SI message.

[0176] In one implementation, if the system information mapped in an SI message includes public system information, then the SI message can also be called a public SI message; if the system information mapped in an SI message includes feature-related system information, then the SI message can also be called a feature-related SI message.

[0177] In this application, an SI message is associated with an SI window. Within this SI window, only this SI message can be sent, and it can be repeated multiple times, but no other SI messages can be sent. All SI messages have the same SI window length, which is preset or preconfigured, or indicated by the network device. The periods of different SI messages are independent of each other, and each SI message is transmitted only within a single SI window.

[0178] This application does not limit how to determine the position of the SI window associated with each SI message. Several possible implementation methods are given below.

[0179] In a first implementation, for public system information, such as second system information, a starting symbol a of a first SI window associated with a first SI message including the second system information satisfies: a=x mod N;

[0180] A system frame number (SFN) of a radio frame where a first SI window associated with the first SI message resides satisfies: SFN mod T = FLOOR (x / N);

[0181] Wherein, x = (n-1) × w; n is determined according to the position order of the first SI message in the list of system information messages included in the first system information, T is the period of the first SI message, the unit of T can be a radio frame, N is the number of symbols included in a radio frame, w is the length of the first SI window associated with the first SI message, mod is a modulo operation, and FLOOR() is a floor operation. The symbol may refer to a symbol such as an orthogonal frequency division multiplexing (OFDM) symbol. The list of system information messages included in the first system information may indicate at least one SI message, as well as system information or subsystem information included in each of the at least one SI message, and information such as the period of each SI message.

[0182] For feature-related system information, such as second subsystem information, the starting symbol a of the second SI window associated with the second SI message including the second subsystem information satisfies: a=x mod N;

[0183] The SFN of the radio frame where the second SI window associated with the second SI message resides satisfies: SFN mod T = FLOOR (x / N);

[0184] Where x = (n*α-1) × w or x = (n-1) × w + L off1 , or x=(n-1+L off1 )×w; α is a number greater than 1, L off1 is an integer greater than 0. Each characteristic corresponds to α or L off1 It is a preset or preconfigured value or a network device configuration value. Different characteristics correspond to α or L off1 The values ​​of can be the same or different, for example, the α corresponding to the first characteristic is equal to 1, and the α corresponding to the second characteristic is equal to 2. off1 The value of may also be determined according to the number of SI messages including the public system information in the system information message list, so that the second SI window associated with the second SI message may be arranged after all SI messages including the public system information.

[0185] With reference to the above description, for example, the system information message list in the first system information may include a scheduling information list (schedulingInfoList), and the content of the schedulingInfoList may be as follows.

[0186] According to the previous description, assuming that L off1=80, a radio frame length is 10 ms, a radio frame includes N=10 symbols, the first SI message is represented by SI-1, the second SI message is represented by SI-2, and the third SI message is represented by SI-3, then the period and SI window of each SI message can be shown in Table 5.

[0187] Table 5

[0188] In conjunction with Table 5, as shown in Figure 6, SI Window 1 associated with the SI-1 message is adjacent to SI Window 2 associated with the SI-2 message, but SI Window 3 associated with the SI-3 message is discontinuous with the other SI windows. For example, the starting position of SI Window 3 is 80 ms away from the starting position of SI Window 1. In other words, for SI messages with a period of 16, common SI messages use SI windows from SFN 0 to SFN 7, and feature-specific SI messages use SI windows from SFN 8 to SFN 15.

[0189] In a second implementation, for public system information, such as the second system information, including the starting symbol a and SFN of the first SI window associated with the first SI message of the second system information, reference may be made to the description in the first implementation.

[0190] For extended system information, such as second subsystem information, the starting symbol a of the second SI window associated with the second SI message including the second subsystem information satisfies: a=x mod N;

[0191] The SFN of the radio frame where the second SI window associated with the second SI message is located satisfies: SFN mod T = FLOOR (x / N) + L off2 ;

[0192] Where x = (n-1) × w; L off2 is an integer greater than 0, L off2 It is a preset or pre-configured value or a network device configuration value. Different features correspond to L off2 The values ​​can be the same or different.

[0193] For example, combining the example of schedulingInfoList, assuming L off2 =8, a radio frame length is 10ms, a radio frame includes N=10 symbols, the first SI message is represented by SI-1, the second SI message is represented by SI-2, and the third SI message is represented by SI-3, then the period and SI window of each SI message can be shown in Table 6.

[0194] Table 6

[0195] Combined with Table 6, SI window 1 associated with the SI-1 message is adjacent to SI window 2 associated with the SI-2 message, but SI window 3 associated with the SI-3 message is discontinuous with other SI windows, for example, the starting position of SI window 3 is 80ms away from the starting position of SI window 1.

[0196] By using the above method, the SI window of the common SI message and the SI window of the feature-related SI message are set in different areas and are not adjacent to each other, which can reduce the complexity of the terminal device receiving system information and improve the efficiency of receiving system information.

[0197] In this application, if the system information sent by the network device changes, the network device can also indicate to the terminal device which system information has changed, and the terminal device needs to update the changed system information. There may be multiple implementations of how the network device indicates that the system information has changed.

[0198] Implementation method 1: The first system information may include a value tag (valueTag) corresponding to each characteristic. The value tag corresponding to each characteristic is used to indicate whether the system information corresponding to the characteristic has been updated (or whether it has changed). Whenever the system information corresponding to a characteristic is updated, the value of the value tag corresponding to the characteristic will change, for example, the value of the value tag will increase by 1. When the system information corresponding to a characteristic has not been updated, the value of the value tag corresponding to the characteristic remains unchanged. The terminal device can determine whether the system information corresponding to each characteristic has been updated based on the value tag corresponding to each characteristic, providing more precise control.

[0199] For example, if the first subsystem information is updated, the value of the value tag corresponding to the first characteristic in the first system information is increased by 1. When the terminal device determines that the value tag corresponding to the first characteristic has changed, it determines that the system information corresponding to the first characteristic has been updated, for example, determining that the first subsystem information has been updated.

[0200] Implementation method 2: When the system information related to the feature is updated, first update indication information is carried in downlink control information (DCI) used for scheduling paging messages (paging), and the first update indication information is used to indicate that the system information related to the feature is updated.

[0201] In this implementation, if a terminal device only receives public system information, it can ignore the system information related to the feature or not read the system information related to the feature according to the first update indication information, thereby reducing the power consumption of the terminal device.

[0202] For example, when the first subsystem information is updated, the network device may send a DCI, where the DCI is scrambled using a paging radio network temporary identity (P-RNTI), and the DCI includes first update indication information. When the terminal device receives the DCI and determines that the DCI includes the first update indication information, it may determine that the system information related to the feature has been updated, and thus receive the updated system information.

[0203] The first update indication information may also be located in a short message field of the DCI, or in other fields of the DCI, which is not limited in this application.

[0204] For example, the first update indication information included in the DCI or the short message field of DCI is systemInfoModification-extend. When the value of systemInfoModification-extend is 1, it indicates that the system information related to the feature is updated; when the value of systemInfoModification-extend is 0, it indicates that the system information related to the feature is not updated.

[0205] Implementation method three: when the system information related to the feature is updated, first update indication information is carried in a paging message (paging), and the first update indication information is used to indicate that the system information related to the feature is updated.

[0206] In this implementation, if a terminal device only receives public system information, it can ignore the system information related to the feature or not read the system information related to the feature according to the first update indication information, thereby reducing the power consumption of the terminal device.

[0207] In implementation method 4, each feature corresponds to an update indication message. When the system information corresponding to the feature is updated, the network device sends the update indication message corresponding to the feature, indicating that the system information related to the feature has been updated. Accordingly, the terminal device can receive the updated system information of each feature based on the update indication message corresponding to each feature.

[0208] In this implementation, since each feature corresponds to an update indication information, when the system information related to a feature is updated, only the terminal device that supports the feature receives the updated system information. Other terminal devices can ignore the system information related to the feature, or not read the system information related to the feature, thereby reducing the power consumption of the terminal device.

[0209] For example, the second update indication information is used to indicate that the system information related to the first feature is updated. When the system information corresponding to the first feature is updated, the network device sends the second update indication information. When the terminal device receives the second update indication information, it receives the updated system information of the first feature.

[0210] The network device may carry the update indication information corresponding to each feature through DCI or a short message field in DCI or a paging message.

[0211] For example, the update indication information corresponding to redcap is expressed as systemInfoModification-redcap. When the value of systemInfoModification-redcap is 1, it indicates that the system information related to the redcap feature has been updated. When the system information related to the redcap feature is updated, the DCI sent by the network device or the short message field in the DCI can include systemInfoModification-redcap, and the value of systemInfoModification-redcap is 1.

[0212] For example, the update indication information corresponding to redcap may be identification information corresponding to redcap. When system information related to the redcap feature is updated, the paging message sent by the network device may include the identification information corresponding to redcap.

[0213] For example, the paging message includes a bitmap, a bit in the bitmap corresponds to a characteristic, and when the system information related to the redcap characteristic is updated, the value of the bit related to the first characteristic in the bitmap is the first value, for example, the first value is 1.

[0214] In implementation method five, each feature corresponds to a paging message. When the system information corresponding to the feature is updated, the network device sends a paging message corresponding to the feature, indicating that the system information related to the feature has been updated. Accordingly, the terminal device can receive the updated system information for each feature based on the paging message corresponding to each feature.

[0215] The paging message corresponding to each characteristic is scrambled using the P-RNTI corresponding to the characteristic, or the paging timing of the paging message corresponding to each characteristic is determined according to the identification information of the characteristic.

[0216] Taking the first characteristic as an example, if the system information related to the first characteristic is updated, for example, the first subsystem information is updated, the network device sends a paging message corresponding to the first characteristic, and the paging message is used to indicate that the system information related to the first characteristic is updated; wherein, the paging message is encrypted with the P-RNTI corresponding to the first characteristic, or the paging occasion (PO) of the paging message is determined according to the identification information of the first characteristic.

[0217] If the paging message corresponding to the first feature is encrypted using the P-RNTI corresponding to the first feature, when the terminal device receives the paging message encrypted with the P-RNTI corresponding to the first feature, it can be determined that the system information related to the first feature is updated, and thus the system information after the system information related to the first feature is updated is received. In this case, the terminal device supporting the first feature does not need to receive all paging messages, but only needs to receive the paging messages encrypted with the P-RNTI corresponding to the first feature, thereby reducing the number of paging messages received and saving power consumption of the terminal device.

[0218] If the paging opportunity of the paging message corresponding to each feature is determined according to the identification information of the feature, the SFN where the paging opportunity is located, that is, the SFN of the paging frame (PF) including the PO, can satisfy: (SFN+PF_offset)mod Tp=(Tp div Np)*(UE_ID mod Np)mod f_N

[0219] Wherein, Tp is the minimum value among the RAN paging cycle, the terminal device specific paging cycle, and the default paging cycle. div represents an integer division operation; and f_N represents the identification information of the feature (the specific name is not limited).

[0220] PF_offset is an offset used to determine PF, and may be carried by SIB1 or the first system information, for example. Np is the total number of PFs included in a paging time window (PTW) of a paging message.

[0221] UE_ID is determined based on the terminal device's identifier. For example, if the terminal device's identifier is an international mobile subscriber identity (IMSI), UE_ID may be equal to IMSI mod 1024, where mod represents a modulo operation. For example, if the terminal device's identifier is a fifth-generation system temporary mobile subscriber identity (5G S-TMSI), UE_ID may be equal to 5G S-TMSI mod 1024.

[0222] PO is indicated by index i_s, i_s satisfies: i_s = floor (UE_ID / Np) mod Ns

[0223] Ns represents the number of POs included in a PF.

[0224] If the paging timing of the paging message corresponding to each feature is determined according to the identification information of the feature, for the terminal device supporting the first feature, it is not necessary to monitor the paging messages in all possible POs, but only needs to monitor the paging messages in the PO determined according to the identification information of the first feature, thereby reducing the number of paging messages that need to be monitored and saving power consumption of the terminal device.

[0225] It is understood that in order to implement the functions in the above embodiments, the terminal device or network device includes hardware structures and / or software modules corresponding to the execution of each function. It should be readily apparent to those skilled in the art that, in combination with the units and method steps of each example described in the embodiments disclosed in this application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in hardware or in a manner driven by computer software depends on the specific application scenario and design constraints of the technical solution.

[0226] The following is a schematic diagram of the structure of possible communication devices provided in the embodiments of the present application. These communication devices can be used to implement the functions of the terminal device or network device in the above method embodiments, and thus can also achieve the beneficial effects possessed by the above method embodiments.

[0227] As shown in Figure 7, a communication device 700 includes a processing unit 710 and a communication unit 720. The communication device 700 is used to implement the functions of the terminal device or network device in each of the above-mentioned method embodiments.

[0228] When the communication device 700 is used to implement the functions of a terminal device:

[0229] a communication unit, configured to receive first system information from a network device, wherein the first system information is used to indicate basic information required for communication, the first system information is further used to schedule first subsystem information, and the first subsystem information is information related to a first characteristic;

[0230] a processing unit, configured to, if it is determined that the first feature is supported, obtain the first subsystem information according to the first system information;

[0231] The communication unit is configured to communicate with the network device according to the first system information and the first subsystem information.

[0232] When the communication device 700 is used to implement the functions of a network device:

[0233] a processing unit, configured to send first system information through the communication unit; the first system information is used to indicate basic information required for communication, the first system information is further used to schedule first subsystem information, and the first subsystem information is information related to the first characteristic;

[0234] The communication unit is used to send the first subsystem information.

[0235] A more detailed description of the processing unit 710 and the communication unit 720 can be directly obtained by referring to the relevant descriptions in the above-mentioned method embodiments, and will not be repeated here.

[0236] It should be understood that the division of units in the above device is merely a division of logical functions. In actual implementation, they can be fully or partially integrated into one physical entity, or physically separated. Moreover, the units in the device can all be implemented in the form of software called through processing elements; or all be implemented in the form of hardware; or some units can be implemented in the form of software called through processing elements, and some units can be implemented in the form of hardware. For example, each unit can be a separately established processing element, or it can be integrated into a certain chip of the device. In addition, it can also be stored in the form of a program in a memory, called by a certain processing element of the device and execute the function of the unit. In addition, all or part of these units can be integrated together, or they can be implemented independently. The processing element here can also be a processor, which can be an integrated circuit with signal processing capabilities. In the implementation process, each operation of the above method or each unit above can be implemented by the integrated logic circuit of the hardware in the processor element or by software called through the processing element.

[0237] In one example, the unit in any of the above devices may be one or more integrated circuits configured to implement the above method, such as one or more application specific integrated circuits (ASICs), one or more digital singnal processors (DSPs), one or more field programmable gate arrays (FPGAs), or a combination of at least two of these integrated circuit forms. For another example, when the unit in the device can be implemented in the form of a processing element scheduler, the processing element can be a processor, such as a general-purpose central processing unit (CPU), or other processor that can call a program. For another example, these units can be integrated together and implemented in the form of a system-on-a-chip (SOC).

[0238] The above-mentioned receiving unit is an interface circuit of the device, which is used to receive signals from other devices. For example, when the device is implemented as a chip, the receiving unit is the interface circuit of the chip used to receive signals from other chips or devices. The above-mentioned sending unit is an interface circuit of the device, which is used to send signals to other devices. For example, when the device is implemented as a chip, the sending unit is the interface circuit of the chip used to send signals to other chips or devices.

[0239] As another possible product form, the terminal device or network device of the embodiment of the present application can be implemented by a general bus architecture. For ease of explanation, refer to Figure 8, which is a structural diagram of a communication device 800 provided in an embodiment of the present application, and the communication device 800 includes a processor 801 and a transceiver 802. The communication device 800 can be a terminal device, or a chip or chip system therein; or, the communication device 800 can be a network device, or a chip or module therein. Figure 8 only shows the main components of the communication device 800. In addition to the processor 801 and the transceiver 802, the communication device 800 can further include a memory 803, and an input and output device (not shown in the figure).

[0240] Optionally, the processor 801 is primarily used to process communication protocols and communication data, as well as control the entire communication device, execute software programs, and process software program data. The memory 803 is primarily used to store software programs and data. The transceiver 802 may include a radio frequency circuit and an antenna. The radio frequency circuit is primarily used to convert baseband signals into radio frequency signals and process radio frequency signals. The antenna is primarily used to transmit and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as a touch screen, display, and keyboard, are primarily used to receive user input and output data to the user.

[0241] Optionally, the processor 801 , the transceiver 802 , and the memory 803 may be connected via a communication bus.

[0242] When the communication device is powered on, the processor 801 can read the software program in the memory 803, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 801 performs baseband processing on the data to be sent and outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 801. The processor 801 converts the baseband signal into data and processes the data.

[0243] In another implementation, the RF circuit and antenna can be set independently of the processor performing baseband processing. For example, in a distributed scenario, the RF circuit and antenna can be arranged remotely from the communication device.

[0244] In some embodiments, in terms of hardware implementation, those skilled in the art may conceive that the above-mentioned communication device 700 may take the form of the communication device 800 shown in FIG. 8 .

[0245] As an example, the functions / implementation process of the processing unit 710 in FIG7 can be implemented by the processor 801 in the communication device 800 shown in FIG8 calling the computer-executable instructions stored in the memory 803. The functions / implementation process of the communication unit 720 in FIG7 can be implemented by the transceiver 802 in the communication device 800 shown in FIG8.

[0246] As another possible product form, the terminal device or network device in the present application may adopt the structure shown in Figure 9, or include the components shown in Figure 9. Figure 9 is a schematic diagram of the structure of a communication device 900 provided in the present application.

[0247] As shown in FIG9 , a communication device 900 includes at least one processor 901. Optionally, the communication device further includes a communication interface 902.

[0248] When the program instructions are executed in the at least one processor 901, the communication device 900 can implement the method provided in any of the aforementioned embodiments and any possible designs thereof. Alternatively, the processor 901 implements the method provided in any of the aforementioned embodiments and any possible designs thereof through logic circuits or by executing code instructions.

[0249] The communication interface 902 can be used to receive program instructions and transmit them to the processor. Alternatively, the communication interface 902 can be used for the communication device 900 to communicate and interact with other communication devices, such as exchanging control signaling and / or service data. Exemplarily, the communication interface 902 can be used to receive signals from devices other than the communication device 900 and transmit them to the processor 901, or to send signals from the processor 901 to other communication devices other than the communication device 900.

[0250] Optionally, the communication interface 902 may be a code and / or data read and write interface circuit, or the communication interface 902 may be a signal transmission interface circuit between a communication processor and a transceiver, or a pin of a chip.

[0251] Optionally, the communication device 900 may further include at least one memory 903, which may be used to store required program instructions and / or data. It should be noted that the memory 903 may exist independently of the processor 901 or may be integrated with the processor 901. The memory 903 may be located within the communication device 900 or outside the communication device 900, without limitation.

[0252] Optionally, the communication device 900 may further include a power supply circuit 904, which may be used to supply power to the processor 901. The power supply circuit 904 may be located in the same chip as the processor 901, or in another chip other than the chip where the processor 901 is located.

[0253] Optionally, the communication device 900 may further include a bus, and various parts of the communication device 900 may be interconnected via the bus.

[0254] In some embodiments, in terms of hardware implementation, those skilled in the art may conceive that the communication device 700 shown in FIG. 7 may take the form of the communication device 900 shown in FIG. 9 .

[0255] As an example, the functions / implementation process of the processing unit 710 in FIG7 can be implemented by the processor 901 in the communication device 900 shown in FIG9 calling the computer-executable instructions stored in the memory 903. The functions / implementation process of the communication unit 720 in FIG7 can be implemented by the communication interface 902 in the communication device 900 shown in FIG9.

[0256] It should be noted that the structure shown in FIG9 does not constitute a specific limitation on the terminal device or network device. For example, in other embodiments of the present application, the terminal device or network device may include more or fewer components than shown, or combine or split certain components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0257] When the communication device is a chip used in a terminal, the terminal chip implements the functions of the terminal in the above method embodiments. The terminal chip receives information from other modules in the terminal (such as a radio frequency module or antenna), and the information is sent by the base station to the terminal; or the terminal chip sends information to other modules in the terminal (such as a radio frequency module or antenna), and the information is sent by the terminal to the base station.

[0258] When the above-mentioned communication device is a module applied to a base station, the base station module implements the functions of the base station in the above-mentioned method embodiment. The base station module receives information from other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the terminal to the base station; or, the base station module sends information to other modules in the base station (such as a radio frequency module or an antenna), and the information is sent by the base station to the terminal. The base station module here can be a baseband chip of a base station, or a CU or DU or other module. The DU here can be an open DU (open DU, O-DU) under an open radio access network (open radio access network, O-RAN) architecture, and the CU here can be an open CU (open CU, O-CU) under an O-RAN architecture.

[0259] It is understood that the processor in the embodiments of the present application may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field programmable gate arrays (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. The general-purpose processor may be a microprocessor or any conventional processor.

[0260] The method steps in the embodiments of the present application can be implemented by hardware or by a processor executing software instructions. The software instructions can be composed of corresponding software modules, and the software modules can be stored in a random access memory, a flash memory, a read-only memory, a programmable read-only memory, an erasable programmable read-only memory, an electrically erasable programmable read-only memory, a register, a hard disk, a mobile hard disk, a CD-ROM or any other form of storage medium well known in the art. An exemplary storage medium is coupled to the processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. In addition, the ASIC can be located in a base station or a terminal device. Of course, the processor and the storage medium can also exist in a base station or a terminal device as discrete components.

[0261] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0262] In the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

[0263] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, optical storage, etc.) that contain computer-usable program code.

[0264] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the present application. It should be understood that each flow and / or box in the flow chart and / or block diagram, as well as the combination of the flow chart and / or box in the flow chart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more flow charts and / or one or more boxes in the block diagram.

[0265] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0266] Obviously, those skilled in the art may make various changes and modifications to the present application without departing from the scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include these modifications and variations.

Claims

1. A system information transmission method, characterized in that, including: receiving first system information from a network device; the first system information is used to indicate basic information required for communication, and the first system information is also used to schedule first subsystem information, where the first subsystem information is related to a first feature; if it is determined that the first feature is supported, obtaining the first subsystem information according to the first system information; communicating with the network device according to the first system information and the first subsystem information.

2. The method according to claim 1, wherein if it is determined that the first feature is not supported, ignoring the first subsystem information.

3. The method according to claim 1 or 2, characterized in that, The method further includes: receiving second system information and second subsystem information, where the second system information is used to indicate other basic information required for communication; the second subsystem information is related to the first feature, and the second subsystem information and the first subsystem information include different information.

4. The method according to claim 3, wherein The first subsystem information indicates proprietary information required for a terminal device supporting the first feature to access the network; the second subsystem information is used to indicate at least one of the following: proprietary information required for a terminal device supporting the first feature to perform intra-frequency cell reselection, inter-frequency cell reselection, or inter-system cell reselection; proprietary intra-frequency cell reselection parameters and a blacklist of proprietary intra-frequency cells required for a terminal device supporting the first feature to perform intra-frequency cell reselection; proprietary inter-frequency frequency point reselection parameters, proprietary inter-frequency cell reselection parameters, and a blacklist of proprietary inter-frequency cells required for a terminal device supporting the first feature to perform inter-frequency cell reselection; proprietary related information required for a terminal device supporting the first feature to perform system general mobile communication system terrestrial radio access (EUTRA) reselection.

5. The method according to claim 3, wherein The first system information further indicates the correspondence between the first subsystem information and the first feature.

6. The method according to any one of claims 3 to 5, characterized in that, The second system information and the second subsystem information are in different system information messages.

7. The method according to any one of claims 3 to 6, characterized in that The second subsystem information is in a system information message, and the start symbol a of the system information window associated with the system information message satisfies: a = x mod N; The system frame number SFN of the radio frame where the system information window associated with the system information message is located satisfies: SFN mod T = FLOOR(x / N); where x = (n * α - 1) × w or x = (n - 1) × w + L off1 ; α is a number greater than 1, L off1 is an integer greater than 0, n is determined according to the position order of the system information message in the system information message list included in the first system information, T is the period of the system information message, N is the number of symbols included in one radio frame, w is the length of the system information window associated with the system information message, mod is the remainder operation, and FLOOR() is the floor operation.

8. The method according to any one of claims 3 to 6, characterized in that, The second subsystem information is in a system information message, and the start symbol a of the system information window associated with the system information message satisfies: a = x mod N; The system frame number SFN of the radio frame where the system information window associated with the system information message is located satisfies: SFN mod T = FLOOR(x / N) + L off2 ; where x = (n - 1) × w; L off2 is an integer greater than 0, T is the period of the system information message, n is determined according to the position order of the system information message in the system information message list included in the first system information, N is the number of symbols included in one radio frame, w is the length of the system information window associated with the system information message, mod is the modulo operation, and FLOOR() is the floor operation.

9. The method according to any one of claims 1 to 8, characterized in that The first system information further includes a value tag corresponding to the first feature, where the value tag is used to indicate whether the system information corresponding to the first feature has been updated.

10. The method according to any one of claims 1 to 9, characterized in that, The method further includes: receiving first update indication information from the network device, where the first update indication information is used to indicate that system information related to a feature has been updated.

11. The method according to claim 9 or 10, characterized in that The first update indication information is in a short message or DCI or paging message.

12. The method according to any one of claims 1 to 9, characterized in that, The method further includes: receiving second update indication information from the network device, where the second update indication information is used to indicate that system information related to the first feature has been updated.

13. The method according to claim 12, characterized in that, The second update indication information is located in a short message, DCI, or paging message.

14. The method according to any one of claims 1 to 7, characterized in that, The method further includes: Receiving a paging message from the network device, where the paging message is used to indicate that system information related to the first characteristic has been updated; wherein, the paging message is scrambled with a paging radio network temporary identity (P-RNTI) corresponding to the first characteristic, or the paging occasion of the paging message is determined according to the identification information of the first characteristic.

15. A method for transmitting system information, characterized in that, Including: Sending first system information; The first system information is used to indicate basic information required for communication, and the first system information is further used to schedule first subsystem information, where the first subsystem information is related to a first characteristic; Sending the first subsystem information.

16. The method according to claim 15, characterized in that, The method further includes: Sending second system information and second subsystem information, where the second system information is used to indicate other basic information required for communication; the second subsystem information is related to the first characteristic, and the second subsystem information and the first subsystem information include different information.

17. The method according to claim 16, wherein The first subsystem information indicates proprietary information required for a terminal device supporting the first characteristic to access the network; the second subsystem information is used to indicate at least one of the following: Proprietary information required for a terminal device supporting the first characteristic to perform intra-frequency cell reselection, inter-frequency cell reselection, or inter-system cell reselection; Proprietary intra-frequency cell reselection parameters required for a terminal device supporting the first characteristic to perform intra-frequency cell reselection and a blacklist of proprietary intra-frequency cells; Proprietary inter-frequency cell reselection parameters, proprietary inter-frequency cell reselection parameters, and a blacklist of proprietary inter-frequency cells required for a terminal device supporting the first characteristic to perform inter-frequency cell reselection; Proprietary related information required for a terminal device supporting the first characteristic to perform reselection to the evolved universal terrestrial radio access (EUTRA) of the system.

18. The method according to claim 16, wherein The first system information further indicates the correspondence between the first subsystem information and the first characteristic.

19. The method according to any one of claims 16 to 18, characterized in that, The second subsystem information is located in a system information message, and the starting symbol a of the system information window associated with the system information message satisfies: a = x mod N; The system frame number (SFN) of the radio frame where the system information window associated with the system information message is located satisfies: SFN mod T = FLOOR(x / N); where x = (n * α - 1) × w or x = (n - 1) × w + L off1 ; α is a number greater than 1, L off1 is an integer greater than 0, n is determined according to the position order of the system information message in the list of system information messages included in the first system information, T is the period of the system information message, N is the number of symbols included in a radio frame, w is the length of the system information window associated with the system information message, mod is the remainder operation, and FLOOR() is the floor operation.

20. The method according to any one of claims 16 to 19, characterized in that, The second subsystem information is located in a system information message, and the starting symbol a of the system information window associated with the system information message satisfies: a = x mod N; The system frame number (SFN) of the radio frame where the system information window associated with the system information message is located satisfies: SFN mod T = FLOOR(x / N) + L off2 ; where x = (n - 1) × w; L off2 is an integer greater than 0, T is the period of the system information message, n is determined according to the position order of the system information message in the system information message list included in the first system information, N is the number of symbols included in one radio frame, w is the length of the system information window associated with the system information message, mod is the remainder operation, and FLOOR() is the floor operation.

21. The method according to any one of claims 15 to 20, characterized in that, The first system information further includes a value tag corresponding to the first characteristic, and the value tag is used to indicate whether the system information corresponding to the first characteristic has been updated.

22. The method according to any one of claims 15 to 21, characterized in that, The method further includes: Sending first update indication information, where the first update indication information is used to indicate that system information related to a characteristic has been updated.

23. The method according to claim 22, wherein The first update indication information is located in a short message, DCI, or paging message.

24. The method according to any one of claims 15 to 21, characterized in that, The method further includes: Receive second update indication information from the network device, where the second update indication information is used to indicate that the system information related to the first feature has been updated.

25. The method according to any one of claims 15 to 24, characterized in that, The method further includes: Sending a paging message, where the paging message is used to indicate that the system information related to the first feature has been updated; wherein, the paging message is scrambled with a paging radio network temporary identity P-RNTI corresponding to the first feature, or the paging occasion of the paging message is determined according to the identification information of the first feature.

26. A communication device, characterized in that, It includes: A communication unit, configured to receive first system information from a network device; The first system information is used to indicate basic information required for communication, and the first system information is further used to schedule first subsystem information, where the first subsystem information is related to a first feature; A processing unit, configured to, if it is determined that the first feature is supported, obtain the first subsystem information according to the first system information; The communication unit is configured to communicate with the network device according to the first system information and the first subsystem information.

27. A communication device, characterized in that, It includes: A processing unit, configured to send first system information through the communication unit; The first system information is used to indicate basic information required for communication, and the first system information is further used to schedule first subsystem information, where the first subsystem information is information related to a first feature; The communication unit is configured to send the first subsystem information.

28. A communication device, characterized in that, It includes a processor; The processor is configured to execute a computer program or instruction stored in a memory, so that the communication device implements the method according to any one of claims 1 to 25.

29. A computer-readable storage medium, characterized in that, A computer program or instruction is stored, and when the computer program or instruction runs on a computer, the computer implements the method according to any one of claims 1 to 25.

30. A chip, characterized in that, It includes a processor, where the processor is coupled to a memory and is configured to execute a computer program or instruction stored in the memory, so that the chip implements the method according to any one of claims 1 to 25.

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