WO2021026835A1

WO2021026835A1 - System information acquisition method, and sending method and apparatus

Info

Publication number: WO2021026835A1
Application number: PCT/CN2019/100653
Authority: WO
Inventors: 陈磊; 李秉肇; 郭英昊; 郝金平
Original assignee: 华为技术有限公司
Priority date: 2019-08-14
Filing date: 2019-08-14
Publication date: 2021-02-18
Also published as: WO2021027000A1

Abstract

A system information acquisition method, and a sending method and apparatus. Provided is a method by which a terminal device in a connected state acquires system information. The method comprises: a terminal device sending a first request message to a network device, wherein the first request message is used for requesting for changed first system information from a network side; and then, the terminal device receiving the first system information from the network device. The network device can actively send the changed first system information to the terminal device when the first system information changes, and therefore, even if the first system information changes, the terminal device does not need to send a request to the network device again, thereby reducing the number of requests made by the terminal device and reducing the overhead of the terminal device for acquiring the system information.

Description

Method and device for acquiring system information, sending method and device

Technical field

This application relates to the field of mobile communication technology, and in particular to a method for obtaining system information, a method for sending it, and a device.

Background technique

In the long-term evolution (LTE) system, system information includes master information block (MIB), system information block 1 (system information block 1, SIB1), other system information blocks except SIB1, and System information block used for positioning. Other system information blocks except SIB1 are also called other system information (OSI), and the system information block used for positioning may be called positioning system information block (posSIB). MIB and SIB1 are necessary system information, and OSI and posSIB are unnecessary system information. When OSI and posSIB are transmitted, they are carried on a system information message. One system information message can carry multiple OSIs or multiple posSIBs.

In the fifth-generation mobile communication technology (5th-generation, 5G), necessary system information is periodically broadcast and transmitted, and non-essential system information can be provided to terminal devices based on the needs of specific terminal devices to save system resources. This transmission method, It is called on-demand system information (SI). For example, when the terminal device is performing positioning, it may request the network device to obtain the posSIB, and the network device sends the posSIB to the terminal device based on the request of the UE.

Since the effective time of the posSIB is relatively short, the UE may request the network device to obtain the posSIB multiple times during the positioning period, resulting in high transmission resource overhead.

Summary of the invention

This application provides a method, a method and a device for acquiring system information, which are used to save the overhead for terminal equipment to acquire system information.

In a first aspect, a method for acquiring system information is provided. The method includes: a terminal device sends a first request message to a network device, where the first request message is used to request changed first system information from the network side; then, The terminal device receives the first system information from the network device.

The method may be executed by a first communication device, and the first communication device may be a communication device or a communication device capable of supporting the communication device to implement the functions required by the method, such as a chip system. Exemplarily, the communication device is a terminal device.

In the embodiment of the present application, the first request message may request the network device to send the changed first system information, that is, even if the first system information changes, the terminal device does not need to send a request to the network device again. It can actively send the changed first system information to the terminal device when the first system information changes, thereby reducing the number of requests of the terminal device, reducing the terminal device's overhead for obtaining system information, and reducing the energy consumption of the terminal device .

In a possible implementation manner, the terminal device does not know whether the system information has changed when sending the first request message.

With reference to the first aspect, in a possible implementation manner of the first aspect, the first request message carries a first duration, wherein the first system information changes within the first duration.

In the embodiment of the present application, the first request message may carry the first duration to instruct the network device to send the first system information that has changed within the first duration to the terminal device. If the first duration exceeds the first duration, the network device can stop sending the message to the terminal. Sending the changed first system information by the device helps to save the overhead of sending the first system information by the network device.

In a possible implementation manner, the method further includes:

The terminal device sends a second request message to the network device, where the second request message is used to instruct the network device to no longer send the changed first system information to the terminal device.

In the embodiment of the present application, the terminal device no longer needs the changed first system information, and the second request message can be used to instruct the network device to no longer send the changed first system information, which helps to save the network device from targeting the first system The cost of sending information.

In a possible implementation manner, the first request message carries a first number and first indication information, the first number is a number of a system information block, and the first system information includes the system information block, The first indication information is used to instruct the network device to send the changed first system information.

In a possible implementation manner, the first request message carries a second number and second indication information, the second number is a number of a system information message, and the first system information includes the system information message, The second indication information is used to instruct the network device to send the system information message.

In the embodiment of the present application, the first request message may be implemented in multiple ways, for example, a system information block may be requested or a system information message may be requested. The embodiment of the present application does not limit how the first request message is implemented.

In a possible implementation manner, the method further includes:

The terminal device determines the serial number of the system information message according to the first system information.

With reference to the first aspect, in a possible implementation manner of the first aspect, the first request message carries a bit map, and the bit map is used to indicate a system information block or a system information message.

In the embodiment of the present application, the first request message may carry a bit map, so that the system information block and the system information message can be distinguished more clearly through the bit map.

In a possible implementation manner, the method further includes:

The terminal device receives the changed first system information from the network device.

In a possible implementation manner, the method further includes:

The terminal device receives the changed first system information from the network device within the first time period.

In the embodiment of the present application, if the first request message carries the first duration, the terminal device can monitor the changed first system information within the first duration without monitoring the first system information all the time, so that the terminal device can be reduced Energy consumption.

In a possible implementation manner, the first system information is used for positioning of the terminal device.

The embodiment of this application provides an application scenario, that is, the system information can be used for the positioning of the terminal device. For example, the system information is posSIB, so when the posSIB fails, the network device will actively send the changed posSIB to the terminal device, so that the terminal device There is no need to request the network device to obtain the posSIB again, which saves the terminal device the overhead of obtaining the posSIB.

In a possible implementation, the first request message is dedicated signaling.

In a possible implementation manner, the first request message includes the cell radio network temporary identity of the terminal device.

In the embodiment of the present application, the first request message may carry the cell wireless network temporary identification. Even if the first request message is not dedicated signaling, the network device can know to which terminal device the changed first request message should be sent according to the cell wireless network temporary identification. system message.

In a second aspect, an embodiment of the present application provides a method for sending system information. The method includes: a network device receives a first request message from a terminal device, and the first request message is used to request a changed first request message from the network side. System information, so that the network device sends the changed first system information to the terminal device when the first system information changes in response to the first request message.

The method can be executed by a second communication device. The second communication device can be a terminal or a communication device capable of supporting the terminal to implement the functions required by the method, and of course it can also be another communication device, such as a chip system. Here, it is taken as an example that the second communication device is a network device.

In a possible implementation manner, the first request message carries a first duration, wherein the first system information changes within the first duration.

In a possible implementation manner, the method further includes:

The network device receives a second request message from the terminal device, where the second request message is used to instruct the network device to no longer send the changed first system information to the terminal device.

In a possible implementation manner, the first request message carries a first number and first indication information, the first number is a number of a system information block, and the first system information is included in the system information block The first indication information is used to instruct the network device to send the changed first system information.

In a possible implementation manner, the first request message carries a second number and second indication information, the second number is the number of the system information message, and the second indication information is used to indicate the network device Send the system information message.

In a possible implementation manner, in response to the first request message, the network device sends the first system information to the terminal device when the first system information changes, including:

The network device sends a system information message corresponding to the second number to the terminal device.

In a possible implementation manner, the method further includes:

The network device does not send the changed first system information after the first time period; or,

After the first time period, the network device continues to send the changed first system information until the end time of the second time period is reached, wherein the network device receives requests from multiple terminal devices For the multiple request messages of the system information, the terminal device is one of the multiple terminal devices, and at least one request message in the multiple request messages carries at least one duration. The second time length belongs to the at least one time length, and the second time length is the time length with the latest end time in the at least one time length.

In a possible implementation manner, the method further includes:

The network device does not send the system information message after the first time period; or,

After the first time period, the network device continues to send the changed system information message until the end time of the second time period is reached, wherein the network device receives a request from multiple terminal devices The multiple request messages of the system information, the terminal device is one of the multiple terminal devices, at least one request message in the multiple request messages carries at least one duration, the first duration and the The second time length belongs to the at least one time length, and the second time length is the time length with the latest end time in the at least one time length.

In a possible implementation manner, the first request message is dedicated signaling.

In a possible implementation manner, the first request message includes the cell radio network temporary identifier C-RNTI of the terminal device.

Regarding the technical effects brought about by the second aspect or various possible implementation manners of the second aspect, reference may be made to the introduction of the technical effects of the first aspect or various possible implementation manners of the first aspect.

In a third aspect, an embodiment of the present application provides a communication device, including a transceiver unit and a processing unit, wherein:

The transceiver unit is configured to send a first request message to the network device under the control of the processing unit, and the first request message is used to request changed first system information from the network side;

Under the control of the processing unit, the first system information from the network device is received.

In a possible implementation manner, the transceiver unit is further configured to:

Send a second request message to the network device, where the second request message is used to instruct the network device to no longer send the changed first system information to the terminal device.

In a possible implementation manner, the first request message carries a first number and first indication information, the first number is a number of a system information block, the first system information includes the system information block, the The first indication information is used to instruct the network device to send the changed first system information.

In a possible implementation manner, the processing unit is further configured to:

The number of the system information message is determined according to the first system information.

In the first time period, receiving the changed first system information from the network device.

In a possible implementation, the first request message is dedicated signaling.

Regarding the technical effects brought about by the third aspect or various possible implementation manners of the third aspect, reference may be made to the introduction of the technical effects of the first aspect or various possible implementation manners of the first aspect.

In a fourth aspect, an embodiment of the present application provides a communication device, including a transceiver unit and a processing unit, wherein:

The transceiver unit is configured to receive a first request message from a terminal device under the control of the processing unit, the first request message being used to request changed first system information from the network side;

The processing unit is configured to control the transceiver unit to send the first system information to the terminal device when the first system information changes in response to the first request message.

Receiving a second request message from the terminal device, where the second request message is used to instruct the network device to no longer send the changed first system information to the terminal device.

In a possible implementation manner, in response to the first request message, the processing unit controls the transceiver unit to send the first system information to the terminal device when the first system information changes When, specifically used for:

The processing unit controls the transceiver unit to send a system information message corresponding to the second number to the terminal device.

In a possible implementation,

The processing unit is further configured to control the transceiver unit not to send the changed first system information after the first duration; or,

The processing unit is further configured to control the transceiver unit to continue to send the changed first system information after the first duration until the end time of the second duration is reached, wherein the transceiver unit receives A plurality of request messages for requesting the system information from a plurality of terminal devices, the terminal device is one of the plurality of terminal devices, and at least one request message in the plurality of request messages carries at least one Time length, the first time length and the second time length belong to the at least one time length, and the second time length is the time length with the latest end moment in the at least one time length.

In a possible implementation, the first request message is dedicated signaling.

Regarding the technical effects brought about by the fourth aspect or various possible implementation manners of the fourth aspect, reference may be made to the introduction of the technical effects of the second aspect or various possible implementation manners of the second aspect.

In a fifth aspect, an embodiment of the present application provides a communication device, which includes a processor, configured to implement the method executed by the terminal device in the first aspect or the network device in the second aspect. The communication device may also include a memory for storing program instructions and data. The memory is coupled with the processor, and the processor can call and execute program instructions stored in the memory to implement any method executed by the terminal device in the first aspect or the network device in the second aspect. The communication device may also include a communication interface, and the communication interface may be a transceiver in the communication device, for example, implemented by the antenna, feeder, and codec in the communication device, or if the fifth type of communication device is set in For a chip in a network device, the communication interface may be an input/output interface of the chip, such as input/output pins. The transceiver is used for the communication device to communicate with other devices. Exemplarily, when the communication device is a terminal device, the other device is a network device; or, when the communication device is a network device, the other device is a terminal device.

In a sixth aspect, embodiments of the present application provide a chip system, which includes a processor and may also include a memory, configured to implement the method executed by the terminal device in the first aspect or the network device in the second aspect. The chip system can be composed of chips, or can include chips and other discrete devices.

In a seventh aspect, an embodiment of the present application provides a communication system, the system includes the terminal device described in the third aspect and the network device described in the fourth aspect, or includes two communication devices in the fifth aspect, one of which One kind of communication device is used to realize the function of terminal equipment, and the other kind of communication device is used to realize the function of network equipment.

In an eighth aspect, the embodiments of the present application also provide a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device in the first aspect or the network device in the second aspect.

In a ninth aspect, the embodiments of the present application also provide a computer program product, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device in the first aspect or the network device in the second aspect.

For the beneficial effects of the aforementioned third to ninth aspects and their implementation manners, reference may be made to the description of the method and implementation manners of the first aspect or the beneficial effects of the method and implementation manners of the first aspect.

Description of the drawings

FIG. 1 is a schematic diagram of a configuration of a BWP provided by an embodiment of the application;

FIG. 2 is a schematic diagram of a configuration of a BWP provided by an embodiment of the application;

3 is a schematic diagram of a terminal device requesting posSIB provided by the prior art;

FIG. 4 is a schematic diagram of a network architecture provided by an embodiment of the application;

FIG. 5 is a schematic flowchart of a method for acquiring and sending system information provided by an embodiment of this application;

6 is a schematic diagram of a terminal device requesting posSIB according to an embodiment of the application;

FIG. 7 is a schematic diagram of a terminal device requesting posSIB according to an embodiment of the application;

FIG. 8 is a schematic diagram of a process of positioning a terminal device according to an embodiment of the application;

FIG. 9 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 10 is a schematic structural diagram of another communication device provided by an embodiment of this application;

FIG. 11 is a schematic structural diagram of a communication device provided by an embodiment of this application;

FIG. 12 is a schematic diagram of another structure of a communication device provided by an embodiment of this application;

FIG. 13 is a schematic block diagram of another communication device according to an embodiment of this application;

FIG. 14 is a schematic structural diagram of another communication device provided by an embodiment of this application;

FIG. 15 is a schematic diagram of another structure of another communication device provided by an embodiment of this application.

detailed description

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

Before introducing this application, first briefly explain some terms in the embodiments of this application, so as to facilitate the understanding of those skilled in the art.

1) Terminal devices, including devices that provide users with voice and/or data connectivity, such as handheld devices with wireless connection functions, or processing devices connected to wireless modems. The terminal device can communicate with the core network via a radio access network (RAN), and exchange voice and/or data with the RAN. The terminal equipment may include user equipment (UE), wireless terminal equipment, mobile terminal equipment, device-to-device communication (device-to-device, D2D) terminal equipment, vehicle-to-everything (V2X) Terminal equipment, machine-to-machine/machine-type communications (M2M/MTC) terminal equipment, Internet of things (IoT) terminal equipment, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile station), remote station (remote station), access point (access point, AP), remote terminal (remote terminal), access terminal (access terminal), user terminal (user terminal) , User agent (user agent), or user equipment (user device), etc. For example, it may include mobile phones (or "cellular" phones), computers with mobile terminal equipment, portable, pocket-sized, handheld, and computer-built mobile devices. For example, personal communication service (PCS) phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (personal digital assistant, PDA), and other equipment. It also includes restricted devices, such as devices with low power consumption, or devices with limited storage capabilities, or devices with limited computing capabilities. Examples include barcodes, radio frequency identification (RFID), sensors, global positioning system (GPS), laser scanners and other information sensing equipment.

As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices or smart wearable devices, etc. It is a general term for using wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes Wait. A wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories. Wearable devices are not only a hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction. In a broad sense, wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones. Use, such as various smart bracelets, smart helmets, smart jewelry, etc. for physical sign monitoring.

The various terminal devices described above, if they are located on the vehicle (for example, placed in the vehicle or installed in the vehicle), can be considered as vehicle-mounted terminal equipment, for example, the vehicle-mounted terminal equipment is also called on-board unit (OBU). ).

2) Network equipment, such as access network (AN) equipment, such as a base station (e.g., access point), may refer to equipment that communicates with wireless terminal equipment through one or more cells on the air interface in the access network Or, for example, a network device in a V2X technology is a roadside unit (RSU). The base station can be used to convert the received air frame and Internet Protocol (IP) packets to each other, as a router between the terminal device and the rest of the access network, where the rest of the access network may include an IP network. The RSU can be a fixed infrastructure entity that supports V2X applications, and can exchange messages with other entities that support V2X applications. The network equipment can also coordinate the attribute management of the air interface. For example, the network equipment may include a long term evolution (LTE) system or an evolved base station (NodeB or eNB or e-NodeB, evolutional Node B) in a long term evolution (advanced, LTE-A) system, Or it can also include the next generation node B (gNB) in the 5G NR system, or it can also include the centralized unit (CU) in the cloud radio access network (Cloud RAN) system. And distributed unit (DU), the embodiment of the present application is not limited.

3) System information includes master information block (MIB), system information block 1 (system information block 1, SIB1), other system information blocks except SIB1, and system information blocks for positioning. Other system information blocks except SIB1 are also called other system information (OSI), and the system information block used for positioning may be called a positioning system information block (posSIB). MIB and SIB1 are necessary system information, and OSI and posSIB are unnecessary system information. When OSI and posSIB are transmitted, they are carried on a system information message. One system information message can carry multiple OSIs or multiple posSIBs. posSIB mainly carries auxiliary information required for positioning. Each posSIB will carry information to indicate the effective time of the current posSIB. Since the auxiliary information of terminal device positioning changes rapidly, the effective time of some posSIBs is very short.

4) SI message (SI message), used to carry SI. One SI message can include one SIB or multiple SIBs. The mapping relationship between SIB and SI messages (that is, which SIBs are included in one SI message) may be included in SIB1 (for example, in scheduling information). The scheduling information may include the scheduling period (SI-periodicity) and the type of SIB carried (that is, the mapping relationship between SIB and SI messages, etc.). Generally, one SIB cannot be split and mapped into two different SI messages. For example, one SIB can be carried by one SI message, and for example, one posSIB can be carried by one SI message. The base station broadcasts the SI message and can notify the terminal equipment of the SIB and posSIB.

5) Bandwidth part (BWP or BP). In the new radio (NR) system, considering factors such as different service types, terminal equipment bandwidth capabilities, or terminal equipment power consumption, BWP is introduced. concept. The base station can realize flexible scheduling of the terminal equipment by configuring multiple BWPs with different bandwidths for the terminal equipment.

BWP can be a continuous resource in the frequency domain, it can also be called carrier bandwidth part, subband bandwidth, narrowband or narrowband bandwidth, or it can have other names. In this application In the embodiment, for simplicity, the name is BWP as an example. For example, a BWP includes continuous K (K>0) subcarriers; or, a BWP is a frequency domain resource where N non-overlapping continuous resource blocks (resource blocks, RB) are located, and the subcarrier spacing of the RB may be 15KHz, 30KHz, 60KHz, 120KHz, 240KHz, 480KHz or other values; or, a BWP is a frequency domain resource where M non-overlapping contiguous resource block groups (RBG) are located, and an RBG includes P(P> 0) A continuous RB, and the subcarrier spacing (SCS) of the RB can be 15KHz, 30KHz, 60KHz, 120KHz, 240KHz, 480KHz or other values, for example, an integer multiple of 2. A BWP is related to a specific system parameter (numerology), and the system parameter includes a subcarrier interval, a cyclic prefix (CP), or a subcarrier interval and CP. Further, the BWP may also be non-contiguous multi-segment resources in the frequency domain.

As shown in #1 of Figure 1, in a carrier broadband (carrier BW), only one BWP can be configured for a terminal device, and the bandwidth of the BWP can be less than or equal to the bandwidth capability of the terminal device (UE bandwidth capability). The capability can be less than or equal to the carrier bandwidth (carrier BW). As shown in #2 of Figure 1, in the carrier bandwidth, two BWPs can be configured for one terminal device, namely BWP1 and BWP2, and the bandwidths of BWP1 and BWP2 can overlap. As shown in #3 of Figure 1, in the carrier bandwidth, two BWPs can be configured for one terminal device, namely BWP1 and BWP2, and BWP1 and BWP2 may not overlap. The system parameters of BWP1 and BWP2 may be the same system parameter, or may also be different system parameters. In practice, the configuration of the BWP (for example, the configuration of the number, location, and/or system parameters of the BWP) may also be other configurations, which are not limited in the embodiment of the present application.

As shown in Figure 2, BWPs can be divided into two categories, namely Initial BWP and Active BWP. Initial BWP refers to the bandwidth of the location where SIB1 is indicated by the MIB broadcast in the cell-defined synchronization information block (synchronisation signal block, SSB). On the Initial BWP, the UE can obtain SIB1 and other system information (other system information, OSI), and can monitor paging, which is mainly used for terminal devices to initiate random access. Active BWP is mainly used for data service transmission. Generally, when the UE has service arrival, the base station will schedule the terminal equipment from the Initial BWP to a BWP whose bandwidth matches its service. Active BWP is configured with Type 0A and Type 2 physical downlink control channels (physical downlink control channel, PDCCH) common search space (CSS). The terminal device can receive paging and OSI on the current Active BWP.

6) On-demand SI refers to SI sent on-demand. In the NR system, there are two ways to send SI. One is to send by broadcast. This method can be understood as that, without the request of terminal equipment, network equipment will periodically send through broadcast; the other is to send on demand This can be understood as sending according to the request of the terminal device. For example, in the case that the system information broadcast status configured by the network device for the terminal device is "not broadcast", if the terminal device needs to obtain SI, the terminal device can send a SI acquisition request to the base station, and the network device obtains the SI from the terminal device Request, send the SI requested by the terminal device to the terminal device through broadcast messages or dedicated signaling. For example, the network device can configure at most 4 activated BWPs for the terminal device on each carrier or serving cell. According to the conclusion of the current agreement, the SI public search space is not necessarily configured for each activated BWP, and only when the SI public search space is configured, the network device will periodically broadcast the SI in the SI public search space. Then for a terminal device, if the active BWP where the terminal device is located is not configured with the SI public search space, the terminal device cannot obtain the SI periodically sent by the network device, but can only obtain the SI in an on-demand manner.

Among them, the system information broadcasting status is configured by the network equipment to the terminal equipment in advance. If the system information broadcasting status is "not broadcast", it means that the network equipment will not broadcast SI periodically, so the terminal equipment needs to actively obtain it.

If the SI is sent according to the request of the terminal device, the terminal device can generally send a request to the network device during the random access process. For example, the SI acquisition request may be the first message (Msg1), the terminal device may request SI from the network device through Msg1 in the random access process, and the network device may send the SI to the terminal device through broadcast or dedicated signaling. Alternatively, the SI acquisition request may be a third message (Msg3), which may request SI from the network device through Msg3 in the random access process, and the network device may send the SI to the terminal device through broadcast or dedicated signaling. Among them, the way that the terminal equipment requests SI from the base station through Msg1 in the random access process can also be called the Msg1 (Msg1based) way, and the way that the terminal equipment requests SI from the base station through Msg3 during the random access process can also be called Based on Msg3 (Msg3based) method. The two methods are introduced below.

Msg1based:

If the network device configures a physical random access channel (PRACH) resource dedicated to requesting SI in SIB1, it can be understood as configuring the mapping relationship between PRACH resources and SI. The PRACH resource includes, for example, a random access preamble (preamble), and may also include other resources. Therefore, the terminal device can request the SI from the network device through the PRACH resource configured by the network device. For example, the terminal device sends an SI acquisition request to the network device through Msg1 (it can be understood as sending Msg1 to the base station through the PRACH resource dedicated to requesting SI), that is, the terminal device can acquire SI in the Msg1based manner. The terminal device can send Msg1 once, request only one SI, or send Msg1 multiple times to request multiple SIs. The network device sends a response message for Msg1 to the terminal device through the second message (Msg2) in the random access process. The Msg2 used to respond to the request for the SI generally only contains a random access preamble identifier (RAPID). Among them, Msg1 can be preamble, and Msg2 can be RAR.

Msg3based:

If the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI, the SI acquisition request can be Msg3, that is, the terminal device can request SI through Msg3. For example, if the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI, the network device can notify the terminal device through SIB1, and the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI. However, the terminal device does not obtain the information of the PRACH resource dedicated to requesting SI configured by the base station in the received SIB1, and it can determine to request SI through Msg3.

In LTE, system information is always broadcast. When there are fewer terminal devices or when there are fewer UEs that require a certain SIB, always broadcasting system information will greatly waste the radio resources of the system. Therefore, on-demand SI is introduced in NR The main idea of the mechanism is that when a terminal device requests a certain SIB, the network device then broadcasts or sends this SIB directly to the terminal device. The specific plan includes:

For terminal devices in idle/inactive state: Msg1-based and Msg3-based solutions can be used to request the network to broadcast certain system information. At this time, the minimum granularity of the request is an SI message.

For the terminal equipment in the connected state: the network can be requested through dedicated signaling, and then received through dedicated signaling. The minimum granularity of the request can be a SIB or posSIB.

7) SI area. In LTE, the system information of each cell is independent, that is, the network equipment will send the system information of each cell to the terminal equipment. After entering a new cell, the terminal device needs to obtain system information again. However, in fact, some system information of different cells may be the same. Therefore, the concept of SI area is introduced in the NR system. That is, a cell corresponds to an area ID, and each cell broadcasts an area ID. If a SIB is identified as area specific, when the terminal device stores the SIB, it will add the area ID and the current SIB version ( For example, valueTag) and the primary public land mobile network (PLMN) identifier are stored together. In this way, when the terminal device moves in the same SI area, if the valueTag of the SIB of the new cell and the information stored in the main PLMN and the terminal device are consistent, the terminal device no longer needs to obtain system information again, thus avoiding frequent acquisition by the terminal device System information to save overhead.

8) The terms "system" and "network" in the embodiments of this application can be used interchangeably. "Multiple" refers to two or more. In view of this, "multiple" may also be understood as "at least two" in the embodiments of the present application. "At least one" can be understood as one or more, for example, one, two or more. For example, including at least one refers to including one, two or more, and does not limit which ones are included. For example, including at least one of A, B, and C, then the included can be A, B, C, A and B, A and C, B and C, or A and B and C. "And/or" describes the association relationship of the associated objects, indicating that there can be three types of relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, and B exists alone. In addition, the character "/", unless otherwise specified, generally indicates that the associated objects before and after are in an "or" relationship.

Unless otherwise stated, the ordinal numbers such as “first” and “second” mentioned in the embodiments of the present application are used to distinguish multiple objects, and are not used to limit the order, timing, priority, or importance of multiple objects.

Some concepts related to the embodiments of the present application are introduced as above, and the technical features of the embodiments of the present application are introduced below.

When the terminal device is performing positioning, the terminal device may send an SI acquisition request to the network device to request the network device to acquire posSIB. After the network device receives the SI acquisition request, it can send the posSIB to the terminal device, and the terminal device receives the posSIB, and after the acquired posSIB becomes invalid, it can resend the SI acquisition request to the network device. As shown in Figure 3, it is a schematic diagram of the terminal device acquiring posSIB. When the terminal device is in the positioning period, at the end of the valid period T of each posSIB (t1, t2, t3, t4, t5), the terminal device can send an SI acquisition request to the network device. Since the SI acquisition request is used to request posSIB, it can also be called a positioning request message (posSIBs request), as shown in Figure 3 as an example. Since the effective time of the posSIB is relatively short, the terminal device needs to send SI acquisition requests to the network device multiple times during the positioning period to request the acquisition of the posSIB, which results in large transmission resources of the terminal device and consumes more resources and energy consumption.

In view of this, the technical solutions of the embodiments of the present application are provided. In the embodiment of this application, the terminal device may request the network device to directly send the changed first system information to the terminal device during the positioning period, so that the terminal device does not need to request the first system information again after the first system information becomes invalid. . In this way, the number of times the terminal device requests the network device to obtain the first system information can be reduced, thereby saving transmission resources and reducing the energy consumption of the terminal device.

The technical solutions provided by the embodiments of the present application may be applied to 5G systems, or applied to future communication systems or other similar communication systems. In addition, the technical solutions provided by the embodiments of the present application can be applied to a cellular link, a PLMN network, a machine to machine (M2M) network, an Internet of things (IoT) network, or other networks. It can also be applied to links between devices, such as device-to-device (D2D) links. The D2D link can also be called a sidelink, and the side link can also be called a side link or a secondary link. In the embodiments of the present application, the aforementioned terms all refer to links established between devices of the same type, and have the same meaning. The so-called devices of the same type can be the link between the terminal device and the terminal device, the link between the base station and the base station, and the link between the relay node and the relay node. This application The embodiment does not limit this. For the link between the terminal device and the terminal device, there are D2D links defined by the third generation partnership project (Rel)-12/13 of the third generation partnership project (3GPP), and there are also cars defined by 3GPP for the Internet of Vehicles. V2X link to car, car to cell phone, or car to any entity, including Rel-14/15. It also includes the V2X link based on the NR system of Rel-16 and subsequent versions that are currently being studied by 3GPP.

Please refer to FIG. 4, which is an application scenario applied by the embodiment of this application, or a network architecture applied by the embodiment of this application. Figure 4 includes access network equipment and 6 terminal devices. These 6 terminal devices can be cellular phones, smart phones, portable computers, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, PDAs and/ Or any other suitable equipment used for communication on the wireless communication system, and all of them can be connected to the access network equipment. These six terminal devices can all communicate with the access network device. For example, the terminal device may be a narrowband terminal device, such as a mMTC terminal device; the terminal device may be a broadband terminal device, such as an existing release 15 NR terminal device. Of course, the number of terminal devices in FIG. 4 is only an example, and it may be less or more.

The access network device in Figure 4 may be a base station. Among them, the access network equipment corresponds to different equipment in different systems. For example, in a fourth-generation mobile communication technology (4th-generation, 4G) system, it can correspond to an eNB, and in a 5G system, it can correspond to a gNB.

The following describes the technical solutions provided by the embodiments of the present application in conjunction with the drawings.

The embodiment of the present application provides a method for acquiring system information. Please refer to FIG. 5, which is a flowchart of the method. In the following introduction process, the application of this method to the network architecture shown in FIG. 4 is taken as an example. In addition, the method can be executed by two communication devices, such as a first communication device and a second communication device, where the first communication device can be a network device or can support the network device to implement the functions required by the method. The communication device or the first communication device may be a terminal device or a communication device (such as a chip system) capable of supporting the terminal device to implement the functions required by the method. The same is true for the second communication device. The second communication device may be a network device or a communication device capable of supporting the functions required by the network device to implement the method, or the second communication device may be a terminal device or capable of supporting the terminal device to implement the method. Communication device with required functions (such as chip system). And there are no restrictions on the implementation of the first communication device and the second communication device. For example, the first communication device may be a network device, the second communication device is a terminal device, or both the first communication device and the second communication device are network devices. The device, or the first communication device and the second communication device are both terminal devices, or the first communication device is a network device, and the second communication device is a communication device capable of supporting the terminal device to implement the functions required by the method, and so on. Among them, the network equipment is, for example, a base station.

For ease of introduction, in the following, the method is executed by a network device and a terminal device as an example, that is, the first communication device is a terminal device and the second communication device is a network device as an example. For example, the terminal device below may be any one of the six terminal devices in FIG. 4, and the network device below may be the network device in FIG. 4. It should be noted that the embodiments of the present application only take execution through network equipment and terminal equipment as an example, and are not limited to this scenario.

Specifically, please continue to refer to FIG. 5, and the flow of the method is described as follows.

S501: The terminal device sends a first request message to the network device, and the network device receives the first request message from the terminal device.

S502: In response to the first request message, the network device sends the changed first system information to the terminal device when the first system information changes.

The first request message here is used to request the changed first system information on the network side. It can be considered that the terminal device requests the network device to send the changed first system information to the terminal device when the first system information changes. . After the network device receives the first request message, if it is determined that the first system information has changed, it sends the changed first system information to the terminal device.

When the terminal device sends the first request message to the network device, it does not know whether the first system information has changed. If the first system information changes when the network device receives the first request message, the network device will change The latter first system information is sent to the terminal device. If the first system information has not changed when the network device receives the first request message, the network device waits until the first system information changes, and then sends the changed first system information to the terminal device.

It should be noted that if the current terminal device has not acquired the first system information, or the current terminal device has acquired the first system information, but the first system information is currently invalid, then the first request message is used by the terminal device to send the network The device requests to obtain the first system information, and requests the network device to send the changed first system information to the terminal device when the first system information changes.

If the terminal device has currently acquired the first system information, the first request message is used for the terminal device to request the network device to send the changed first system information when the first system information changes. For example, when the terminal device is in the idle state, it has acquired the first system information, and then the terminal device enters the connected state. At this time, the first request message can request the network device to send the changed first system information when the first system information changes. information.

Exemplarily, the first request message may carry an indication information for indicating whether the terminal device needs the changed first system information, or the currently available first system information, and the changed first system information. Therefore, the network device can determine, according to the instruction information, whether the terminal device needs the changed first system information, or the currently available first system information and the changed first system information.

In a possible implementation manner, the indication information may occupy 1 bit, and the value of the indication information indicates whether the terminal device needs the changed first system information or the currently available first system information , And the first system information after the change.

In a possible implementation manner, this indication information may be the first system information, and if the first request message carries the first system information, it may indicate that it is used to request the changed first system information. If the first request message does not carry the first system information, it may be used to request the currently available first system information and the changed first system information.

According to whether the terminal device currently obtains the first system information, the execution of S502 includes the following steps:

S5021. The network device sends the first system information to the terminal device, so that the terminal device receives the first system information.

If the current terminal device has not acquired the first system information, after receiving the first request message, the network device may send the first system information to the terminal device if it is determined that the terminal device has not acquired the first system information.

S5022. The network device determines that the first system information has changed.

After the network device sends the first system information to the terminal device, it can determine whether the first system information has changed, so as to send the changed first system information to the terminal device after the first system information changes.

S5023. The network device sends the changed first system information to the terminal device, so that the terminal device receives the changed first system information.

The network device determines that the first system information has changed, and then sends the changed first system information to the terminal device.

It should be noted that if the terminal device currently has acquired the first system information, after receiving the first request message, the network device may not send the current first system information to the terminal device, but when the current first system information changes , Before sending the changed first system information to the terminal device. Therefore, S5021 is not necessary in the embodiment of the present application, so it is illustrated by a dotted line in FIG. 5.

In the embodiment of the present application, when the terminal device needs to obtain the first system information, and the system information broadcast state configured by the network device for the terminal device is "not broadcast", the terminal device may send the first request message to the network device, To obtain the first system information. For example, in the NR system, the network equipment can configure up to 4 active BWPs for the terminal equipment on each carrier or serving cell. And the activated BWP where the terminal device is located is not configured with the system information CSS, the terminal device cannot obtain the system information periodically sent by the network device, but can only obtain system information on demand, so the terminal device can send to the network device The first request message.

For example, if the terminal device is in an idle state or in an inactive state, the first request message may be Msg1 in the random access process, that is, the terminal device may obtain the first system information in an Msg1based manner. For example, the terminal device requests the first system information from the network device through Msg1 in the random access process, and the network device may send the changed first system information to the terminal device through dedicated signaling.

In this manner, the network device is configured with PRACH resources dedicated to requesting SI, which can be understood as configuring the mapping relationship between PRACH resources and SI. The PRACH resource includes, for example, a preamble, and may also include other resources. According to the mapping relationship between PRACH resources and SI, the terminal device sends Msg1 once, and can request only one SI or multiple SIs. For example, for network device configuration, PRACH resource 1 corresponds to SI#1, and PRACH resource 2 corresponds to SI#2 and SI#3. Then, if the terminal device uses PRACH resource 1 when sending Msg1, it indicates that the terminal device requests SI#1, and if the terminal device uses PRACH resource 2 when sending Msg1, it indicates that the terminal device requests SI #2 and SI#3. The terminal device only needs to select the corresponding PRACH resource according to the SI to be requested.

For another example, if the terminal device is in an idle state or an inactive state, and if the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI, the terminal device can request SI through Msg3, that is, the first request message may be Msg3. For example, if the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI, it can inform the terminal device through SIB1 that the network device does not configure the terminal device with a PRACH resource dedicated to requesting SI. However, the terminal device does not obtain the information of the PRACH resource dedicated to requesting SI configured by the network device in the received SIB1, and it can be determined to request the first system information through Msg3.

For another example, if the terminal device is in the connected state, the first request message may be radio resource control (Radio Resource Control, RRC) signaling, that is, the terminal device may obtain the first system information from the network device through RRC signaling. The network device may also send the first system information to the terminal device through RRC signaling.

It should be noted that the implementation of the first request message through Msg1, Msg3, or RRC signaling is only an example, and the embodiment of this application does not limit other implementations of the first request message. For example, the first request message may also be implemented through newly added signaling. achieve.

The first request message is used to instruct the network device to send the changed first system information to the terminal device, and there may be several implementation manners.

Exemplarily, as a first implementation manner of the first request message, the first request message may carry the first number and the first indication information.

The first number is the number of the system information block, and the first system information to be acquired by the terminal device includes the system information block. For example, the terminal device requests to obtain SIB2 from the network device, and the first number may be the number of SIB2. Alternatively, the first number is the number of the first system information message, and the first system information to be acquired by the terminal device is the first system information message indicated by the first number. For example, the terminal device requests to obtain posSIB from the network device, then the first number may be the number of posSIB.

The first indication information may be used to instruct the network device to send the changed first system information when the first system information changes. The first indication information may be carried in a field of the first request message. For example, if the first request message is RRC signaling, the first indication information may be carried in a field of RRC signaling, which may be a newly added field of RRC signaling, or it may be original RRC signaling. Field. The first indication information can occupy 1 bit. When the value of the first indication information is "0", it can instruct the network device to send the changed first system information when the first system information changes; accordingly When the value of the first indication information is "1", it can instruct the network device to send the current first system information, or instruct the network device not to send the first system information. In other embodiments, when the value of the first indication information is "1", it may instruct the network device to send the changed first system information when the first system information changes; accordingly, when the first indication information The value of is "0", which can instruct the network device to send the current first system information, or instruct the network device not to send the first system information. It should be noted that in the embodiments of the present application, the value of the first indication information may also be understood as the value carried by the first field in some embodiments. For another example, if the first request message is Msg3, the first indication information may be carried in the common control channel.

As a second implementation manner of the first request message, the first request message may be a message for requesting an SI message. For example, a terminal device may request SIB1 from a network device by requesting an SI message containing SIB1 from the network device.

In this manner, the first request message may carry the second number and the second indication information. Among them, the second number is the number of the system information message. After receiving the first request message, the network device sends the SI message corresponding to the second number to the terminal device. For example, if the network device configures the CSS for the terminal device, the network device can broadcast SI messages. One SI message may include multiple SIBs, and different SI messages may include different SIBs. For example, SI message 1 includes SIB2 and SIB3; SI message 2 includes SIB2, SIB4, and SIB5. If terminal device 1 needs to acquire SIB4, terminal device 2 needs to acquire SIB2. In this case, the network device broadcasts the SI message 2, and the terminal device 1 receives the SI message 2 and can obtain the required SIB4 from it; the terminal device 2 receives the SI message 2 and can obtain the required SIB2 from it. In this way, the network device does not need to separately send the first system information for the terminal device 1 and the terminal device 2, thereby saving the cost of the network device. The second indication information is similar to the above-mentioned first indication information, and will not be repeated here.

When the terminal device needs to obtain the first system information, the first request message may carry the aforementioned second number. The first system information required by different terminal devices may be different, so the second number carried in the corresponding first request message is also different. When a network device broadcasts an SI message, the SI message broadcast at the same time may include the first system information required by a certain terminal device, but may not include the first system information required by a certain terminal device. If the terminal device reads the SI message broadcast by the network device every time, it is obvious that some of the obtained SI messages are useless. For this reason, when a network device broadcasts an SI message, it can broadcast which SIBs the SI message includes, and the sending location information of the SI message, so that the terminal device can read the corresponding SI message according to its own needs to save transmission resource overhead.

In some embodiments, the first request message may also carry a bitmap, and the bitmap may be used to indicate whether the first request message requests a system information block or a system information message. For example, the first request message may carry the first number and bitmap, or the first request message may carry the second number and bitmap. For example, the bitmap occupies 1 bit. When the value of the 1 bit is "0", the first request message requests a system information block. Correspondingly, when the value of the 1 bit is "1", the first request message requests an SI message Or, in some embodiments, when the value of the 1bit is "1", the first request message requests a system information block, and correspondingly, when the value of the 1bit is "0", the first request message requests Is the SI message. In this embodiment of the application, the bitmap is used to more clearly inform the network device whether the terminal device requests a system information block or an SI message.

It should be noted that if the first request message carries a bitmap, the first request message may not carry the first number or the second number. If the first request message does not carry the first number or the second number, the first number or the second number may be agreed in advance. For example, it is agreed in advance that the first number is X and the second number is Y, and the network device receives the first number. If the first request message carries a bitmap, the system information block corresponding to X may be sent to the terminal device according to the value of the bitmap, or the network device may send the SI message corresponding to Y to the terminal device according to the value of the bitmap.

The above-mentioned first and second methods can be considered as explicit instructions. In addition, the first request message in this application can also implicitly instruct the network device to send when the first system information changes. The first system information after the change. For example, the message type of the first request message may be newly defined. Assume that the message type of the first request message is type X, which is different from the message type of Msg1 above, and type X indicates that the terminal device requests that the network device changes in the first system information At this time, the changed first system information is sent to the terminal device. Correspondingly, Msg1 indicates that the terminal device requests the first system information from the network device without requesting the network device to actively send the changed first system information to the terminal device. In this case, if the network device determines that the message type of the first request message is type X, it is determined that the terminal device requests the network device to send the changed first system information to the terminal device when the first system information changes. If the network device determines that the first request message is Msg1, that is, the message type is not type X, it determines that the terminal device requests the first system information from the network device without requesting the network device to actively send the changed first system information to the terminal device. For another example, this application may newly add signaling, which is used to instruct the network device to send the changed first system information when the first system information changes. Wherein, the above type X is only to illustrate that the message type of the first request message can be a newly added type, and "X" does not have a referential effect.

In some embodiments, the first request message may also include a cell-radio network temporary identifier (C-RNTI) of the terminal device. If the first request message sent by the terminal device to the network device is not dedicated signaling, the network device may not know which terminal device sent the first request message. Therefore, if the first request message is not dedicated signaling, the first request message may also carry the C-RNTI, so that the network device can send the changed first system information to the terminal device corresponding to the C-RNTI.

In some embodiments, the first request message may also be used to request the network device for the first system information that has changed within the first time period. For example, the terminal device may request the network device to obtain the first system information for terminal device positioning, such as posSIB, during the positioning period, but not during the positioning period, the network device may not continue to request the posSIB to save the network device overhead.

Exemplarily, the first request message may carry the first duration to request the network device to obtain the first system information that has changed within the first duration. That is, if the action of changing the first system information is within the first time period, the network device sends the changed first system information to the terminal device. Following the above example, the first duration may be the duration of the positioning period of the terminal device. The first duration may be characterized by the start moment of the first duration and the end moment of the first duration, that is, the first request message may carry two time information, for example, the first time information and the second time information. The first time information may indicate the start time of the first duration, and correspondingly, the second time information indicates the end time of the first duration. Both the first time information and the second time information may be coordinated universal time (UTC), for example, the first time information represents the first UTC, the second time information represents the second UTC, the first UTC and the second UTC The absolute value of the difference between is the first duration. Alternatively, both the first time information and the second time information may be the number of the subframe or the number of the radio frame. For example, both the first time information and the second time information are numbers of subframes, and the interval between these two subframes is the first duration. For another example, both the first time information and the second time information are numbers of wireless frames, and the interval between the two wireless frames is the first duration. Alternatively, the first duration may be characterized by a starting time and a duration, that is, the first request message may carry a piece of time information and a piece of duration information. The time information may indicate a moment, and the duration information may indicate a duration to instruct the network device to start from this moment. During this duration, if the first system information changes, the first system information is sent to the terminal device .

It should be noted that the foregoing implementation of the first duration is only an example, and this application does not limit the specific implementation of the first duration.

S503: The network device stops sending the changed first system information to the terminal device after the first time period.

If the first request message carries the first duration, then after the network device receives the first request message, if the first system information changes within the first duration, the network device sends the changed first system information to the terminal device. Correspondingly, the terminal device receives the first system information from the network device within the first time period, or it can also be considered that the terminal device monitors the first system information from the network device within the first time period, and after the first time period, does not Then monitor the first system information from the network device. If the network device determines that the system information changes after the first time period, the network device no longer sends the first system information to the terminal device.

On the contrary, if the first request message does not carry the first duration, then after the network device receives the first request message, as long as the first system information changes, it will send the first system information to the terminal device. In fact, the terminal device may The first system information is not always needed. For example, during the positioning period, the terminal device requests the network device to obtain posSIB, but outside the positioning period, the terminal device does not need posSIB. Therefore, when the terminal device no longer needs the first system information, it can instruct the network device to no longer send the first system information to the terminal device, thereby saving the overhead of the network device.

S504: The terminal device sends a second request message to the network device.

The second request message may be used to instruct the network device to no longer send the changed first system information to the terminal device. The network device receives the first request message, and then sends the changed first system information to the terminal device, and stops sending the changed first system information to the terminal device until the second request message is received, so as to save network side resource overhead , Reduce the energy consumption of network equipment.

The second request message may carry the first number or the second number. If the first request message carries the first number, the second request message also carries the first number; and if the first request message carries the second number, the second request message also carries the second number to inform the network device to stop sending to the terminal device Is the first system information.

Among them, S504 is not necessary, so it is illustrated by a dotted line in FIG. 5. For example, if the first request message carries the first duration, the terminal device may not perform S504. It should be noted that although the first request message carries the first duration, the terminal device may also perform S504.

It should be noted here that in some scenarios, the network device can determine that the terminal device needs to change the first system information. In this case, the first request message is not necessary. When the first system information changes, the network device actively sends The terminal device sends the changed first system information. However, in this case, if the terminal device determines that the changed first system information is not needed, it can still send the second request message to the network device.

In some embodiments, the first request message and the second request message may be the same message. When the first request message and the second request message are the same message, the message may include an indication information. The indication information may be used to instruct the network device to send the first system information, or the indication information may be used to instruct the network device to no longer Send the first system information. For example, the indication information can be carried in a field of this message, and the indication information can occupy 1 bit. When the value of the indication information is "0", it can instruct the network device to send when the first system information changes. The changed first system information; accordingly, when the value of the indication information is "1", it can instruct the network device not to send the first system information. In other embodiments, when the value of the indication information is "1", it can instruct the network device to send the changed first system information when the first system information changes; accordingly, when the indication information is taken The value is "0", which can indicate that the network device does not send the first system information.

Exemplarily, please refer to FIG. 6, which is a schematic diagram of a terminal device requesting to obtain posSIB. If the first request message does not carry the first duration, and the terminal device needs posSIB during positioning, the terminal device can send the first request message to the network device at the beginning of the positioning period until the terminal device no longer needs posSIB, then The second request message may be sent to the network device, that is, the terminal device sends the second request message at the end of the positioning period. In FIG. 6, the first request message is indicated by posSIBs request, and the second request message is indicated by Cancel posSIBs request. After the network device receives the first request message, as long as it is determined that the posSIB has changed, it will send the changed posSIB to the terminal device. Until the network device receives the second request message, it will not continue to send the changed posSIB to the terminal device. . It can be seen that, as shown in Figure 6, during the positioning of the terminal device, posSIB has changed 5 times, but the terminal device only needs to request posSIB once, and the network device will send the posSIB changed 5 times to the terminal device. The terminal device needs to request 5 posSIB, which saves the terminal device's overhead.

For another example, please refer to FIG. 7, which is a schematic diagram of a terminal device requesting to obtain a posSIB. If the first request message carries the first duration, and the positioning period of the terminal device may be the first duration. If the terminal device needs posSIB during the positioning period, the terminal device can send the first request message to the network device at the beginning of the positioning period. After receiving the first request message, the network device sends the posSIB to the terminal device as long as it is determined that the posSIB has changed. Until the end of the first time period, the network device stops sending the posSIB to the terminal device. It can be seen that, as shown in Figure 7, during the positioning of the terminal device, posSIB has changed 5 times, but the terminal device only needs to request posSIB once. Compared with the current terminal device that needs to request posSIB 5 times, the terminal device's overhead is saved. . Moreover, the terminal device does not need to send a second request message to the network device separately, which helps to save the overhead of the terminal device.

In addition, there may be multiple terminal devices sending the first request message to the network device. If multiple terminal devices request the network device to obtain the first system information, the network device can send the SI message by broadcasting, which can effectively reduce the network device’s information. Order overhead. In some embodiments, the first request message may be RRC signaling. When the network device determines to send the SI message by broadcast or unicast, the network device may also send an Acknowledgement (ACK) message to the terminal device. The ACK The message can be a physical layer message, MAC layer message or RRC layer message. If the network device determines to send the SI message by broadcasting, the ACK message can inform the terminal device that the network device has received the first request message and sends the SI message by broadcasting. If the network device determines to send the SI message in unicast mode, the ACK message can inform the terminal device that the network device has received the first request message and sends the SI message in unicast mode.

If the first request messages sent by the multiple terminal devices carry the first duration, the first durations corresponding to the first request messages of different terminal devices may also be different. For example, there are three terminal devices that send the first request message to the network device. The first request message 1 sent by the terminal device 1 carries the first duration as duration 1, and the first request message 2 sent by the terminal device 2 carries the first duration. It is duration 2, and the first duration carried in the first request message 3 sent by the terminal device 3 is duration 3, and duration 1, duration 2, and duration 3 are all different. After the network device receives multiple first request messages, the network device can choose when to stop broadcasting the SI message. For example, the network device may continue to broadcast the SI message after the first duration until the end time of the second duration is reached. The second duration is the duration of the latest end time among the multiple first durations carried in the multiple first request messages. Following the above example, if duration 1 is the earliest end time duration among duration 1, duration 2, and duration 3, and duration 3 is the latest duration among duration 1, duration 2 and duration 3, then the terminal device receives the first After the first request message 1, the first request message 2 and the first request message 3, the SI message may continue to be broadcast after the duration 1 until the end of the duration 3, and the network device stops broadcasting the SI message.

In this manner, correspondingly, the second request message sent by the terminal device to the network device may also carry the second number to inform the network device to stop sending the SI message corresponding to the second number.

Since the network device broadcasts the SI message, for some terminal devices, the received first system information obtained from the SI message may have expired. For example, the first system information is posSIB, and the validity period of the posSIB is less than the period of the network device broadcasting system information, then the posSIB received by the terminal device may expire. In this case, if the terminal device determines that the received first system information has expired, the terminal device can directly read the broadcast of the network device to obtain the latest first system information.

In a possible situation, the terminal device requests the acquired posSIB, and the terminal device determines whether the acquired posSIB is expired or not can be determined according to the posSIB identifier, such as area specific. To facilitate understanding, the following takes the process of terminal device positioning as an example to introduce the terminal device to determine whether the acquired posSIB has expired.

Refer to Figure 8. The process of terminal device positioning includes the following steps:

Step S801: The positioning server sends positioning assistance information to the network device.

The positioning assistance information is used for positioning of the terminal device. When sending the positioning assistance information, the positioning server may indicate the identification of the positioning assistance information, such as area specific or cell specific.

In some embodiments, if the positioning server indicates that the identifier of the positioning assistance information is area specific, the positioning server may also indicate the system information area ID (SI area ID) of the positioning assistance information.

Step S802: The network device sends the first system information to the terminal device.

After the network device receives the positioning assistance information, it can send the positioning assistance information through the corresponding posSIB. Specifically, the network device may send SIB1 to the terminal device. The SIB1 includes scheduling information of posSIB and includes identification information indicating posSIB, which is used to indicate whether the posSIB identification is area-specific or cell-specific.

In some embodiments, when the network device receives positioning assistance information, if it is determined that the SI area ID of the positioning assistance information is inconsistent with the SI area ID broadcast by the current cell, the posSIB identifier corresponding to the positioning assistance information may be updated to cell specific.

Step S803: The terminal device stores the first system information used for positioning.

The terminal device obtains the posSIB according to SIB1. If it is determined that the posSIB identifier is area specific, then when the terminal device stores the posSIB, it also needs to store the main PLMN and the SI area identifier. In this way, if the identity of the posSIB is area specific, after the terminal device moves to a new cell, it can judge whether the stored posSIB is valid by judging the primary PLMN and SI area identity of the cell.

In this way, the terminal device can re-read the posSIB issued by the network device when the posSIB is determined to be invalid, thereby reducing the overhead of the terminal device frequently reading system information.

This application adopts the above solution. In the embodiment of this application, the first request message can request the network device to send the changed first system information, that is, even if the first system information changes, the terminal device does not need to send the network device to the network again. When the device sends a request, the network device can actively send the changed first system information to the terminal device when the first system information changes, thereby reducing the number of requests for the terminal device, reducing the overhead for the terminal device to obtain system information, and also reducing The energy consumption of the terminal equipment.

In the above-mentioned embodiments provided in the present application, the methods provided in the embodiments of the present application are introduced from the perspective of network equipment, terminal, and interaction between the network equipment and the terminal. In order to implement the functions in the methods provided in the above embodiments of the present application, the network device and the terminal may include hardware structures and/or software modules, and the above functions are implemented in the form of hardware structures, software modules, or hardware structures plus software modules. Whether one of the above-mentioned functions is executed in a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraint conditions of the technical solution.

The communication device used to implement the foregoing method in the embodiment of the present application will be described below in conjunction with the accompanying drawings. Therefore, the above content can all be used in the subsequent embodiments, and the repeated content will not be repeated.

FIG. 9 shows a schematic structural diagram of a communication device 900. Wherein, the communication device 900 can implement the functions of the terminal device in the method provided in the embodiments of the present application; the communication device 900 may also be a device that can support the terminal device to implement the corresponding functions in the method provided in the embodiments of the present application. The communication device 900 may be a hardware structure, a software module, or a hardware structure plus a software module. The communication device 900 may be implemented by a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

The communication device 900 may include a processing unit 901 and a transceiving unit 902.

The processing unit 901 may control the transceiver unit 902 to execute S501, S5021, S5023, and S503 in the embodiment shown in FIG. 5, and/or other processes for supporting the technology described herein.

The transceiver unit 902 is used for the communication device 900 to communicate with other modules, and it may be a circuit, a device, an interface, a bus, a software module, a transceiver, or any other device that can implement communication.

The transceiving unit 902 may be used to perform the steps performed by the transceiving unit 902 in the embodiment shown in FIG. 5, and/or to support other processes of the technology described herein.

Among them, all relevant content of each step involved in the above method embodiment can be cited in the function description of the corresponding function module, and will not be repeated here.

FIG. 10 shows a schematic structural diagram of a communication device 1000. Wherein, the communication device 1000 can realize the function of the network device in the method provided in the embodiment of this application; the communication device 1000 may also be a device that can support the network device to realize the function of the network device in the method provided in the embodiment of this application. The communication device 1000 may be a hardware structure, a software module, or a hardware structure plus a software module. The communication device 1000 may be implemented by a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

The communication device 1000 may include a processing unit 1001 and a transceiving unit 1002.

The transceiver unit 1002 is used for the communication device 1000 to communicate with other modules, and it may be a circuit, a device, an interface, a bus, a software module, a transceiver, or any other device that can implement communication.

The transceiver unit 1002 may be used to perform S501, S5021, S5023, and S503 in the embodiment shown in FIG. 5 and/or other processes used to support the technology described herein.

The processing unit 1001 may be used to execute S5022 and S504 in the embodiment shown in FIG. 5, and to control the transceiver unit 1002 to execute the steps executed by the transceiver unit 1002 in the embodiment shown in FIG. 5, and/or to support this document Other processes of the described technique.

As shown in FIG. 11 is a communication apparatus 1100 provided by an embodiment of this application, where the communication apparatus 1100 may be a terminal device, which can realize the function of the terminal equipment in the method provided in the embodiment of this application, or the communication apparatus 1100 may be a network device , Can realize the function of the network device in the method provided in the embodiment of this application; the communication device 1100 may also be a device that can support the terminal device to realize the corresponding function in the method provided in the embodiment of this application, or can support the network device to realize the implementation of this application The corresponding function device in the method provided in the example. Wherein, the communication device 1100 may be a chip system. In the embodiments of the present application, the chip system may be composed of chips, or may include chips and other discrete devices.

In terms of hardware implementation, the foregoing transceiver unit 902 or the transceiver unit 1002 may be a transceiver, and the transceiver is integrated in the communication device 1100 to form a communication interface 1110.

The communication device 1100 includes at least one processor 1120, configured to implement or support the communication device 1100 to implement the functions of the terminal device in the method provided in the embodiments of the present application. Exemplarily, the processor 1120 may generate the first request message and the second request message to be sent to the network device, and control the terminal device to send the first request message and/or the second request message to the network device. For details, refer to the method example The detailed description is not repeated here.

The communication device 1100 may further include at least one memory 1130 for storing program instructions and/or data. The memory 1130 and the processor 1120 are coupled. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, and may be in electrical, mechanical or other forms, and is used for information exchange between devices, units or modules. The processor 1120 may cooperate with the memory 1130 to operate. The processor 1120 may execute program instructions stored in the memory 1130. At least one of the at least one memory may be included in the processor.

The communication device 1100 may further include a communication interface 1110 for communicating with other devices through a transmission medium, so that the device used in the communication device 1100 can communicate with other devices. Exemplarily, when the communication device is a terminal device, the other device is a network device; or, when the communication device is a network device, the other device is a terminal device. The processor 1120 may use the communication interface 1110 to send and receive data. The communication interface 1110 may specifically be a transceiver.

The specific connection medium between the communication interface 1110, the processor 1120, and the memory 1130 is not limited in the embodiment of the present application. In the embodiment of the present application, in FIG. 11, the memory 1130, the processor 1120, and the communication interface 1110 are connected by a bus 1140. The bus is represented by a thick line in FIG. 11, and the connection mode between other components is only for schematic illustration. , Is not limited. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, only one thick line is used to represent in FIG. 11, but it does not mean that there is only one bus or one type of bus.

In the embodiment of the present application, the processor 1120 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. Or execute the methods, steps, and logical block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.

In the embodiment of the present application, the memory 1130 may be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., and may also be a volatile memory (volatile memory). For example, random-access memory (RAM). The memory is any other medium that can be used to carry or store desired program codes in the form of instructions or data structures and that can be accessed by a computer, but is not limited thereto. The memory in the embodiments of the present application may also be a circuit or any other device capable of realizing a storage function, for storing program instructions and/or data.

It should be noted that the communication device in the foregoing embodiment may be a terminal device or a circuit, and may also be a chip applied to a terminal device or other combination devices or components having the functions of the foregoing terminal device. When the communication device is a terminal device, the transceiver unit may be a transceiver, which may include an antenna and a radio frequency circuit, etc., and the processing module may be a processor, for example, a central processing unit (CPU). When the communication device is a component with the above-mentioned terminal device function, the transceiver unit may be a radio frequency unit, and the processing module may be a processor. When the communication device is a chip system, the transceiver unit may be an input and output interface of the chip system, and the processing module may be a processor of the chip system.

Fig. 12 shows a schematic structural diagram of a simplified communication device. It is easy to understand and easy to illustrate. In FIG. 12, the communication device uses a network device as an example. The base station may be applied to the system shown in FIG. 4, and may be the access network device in FIG. 4, which performs the functions of the network device in the foregoing method embodiment. The network device 120 may include one or more radio frequency units, such as a remote radio unit (RRU) 1210 and one or more baseband units (BBU) (also referred to as digital units, digital units, DU). ) 1220. The RRU 1210 may be called a communication module, which corresponds to the transceiver unit 1002 in FIG. 10. Optionally, the communication module may also be called a transceiver, a transceiver circuit, or a transceiver, etc., which may include at least one antenna 1211和RF unit 1212. The RRU 1210 part is mainly used for sending and receiving of radio frequency signals and conversion of radio frequency signals and baseband signals, for example, for sending instruction information to terminal equipment. The 1220 part of the BBU is mainly used for baseband processing and control of the base station. The RRU 1210 and the BBU 1220 may be physically set together, or may be physically separated, that is, a distributed base station.

The BBU 1120 is the control center of the base station, and may also be called a processing module, which may correspond to the processing unit 1001 in FIG. 10, and is mainly used to complete baseband processing functions, such as channel coding, multiplexing, modulation, and spreading. For example, the BBU (processing module) may be used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment, for example, to generate the foregoing indication information.

In an example, the BBU 1220 may be composed of one or more single boards, and multiple single boards may jointly support a radio access network (such as an LTE network) of a single access standard, or support different access standards. Wireless access network (such as LTE network, 5G network or other networks). The BBU 1220 also includes a memory 1221 and a processor 1222. The memory 1221 is used to store necessary instructions and data. The processor 1222 is used to control the base station to perform necessary actions, for example, used to control the base station to execute the operation procedure of the network device in the foregoing method embodiment. The memory 1221 and the processor 1222 may serve one or more single boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.

Fig. 13 shows a schematic structural diagram of a simplified communication device. It is easy to understand and easy to illustrate. In FIG. 13, the communication device uses a mobile phone as an example. As shown in Figure 13, the terminal equipment includes a processor, a memory, a radio frequency circuit, an antenna, and an input and output device. The processor is mainly used to process the communication protocol and communication data, and to control the terminal device, execute the software program, and process the data of the software program. The memory is mainly used to store software programs and data. The radio frequency circuit is mainly used for the conversion of baseband signal and radio frequency signal and the processing of radio frequency signal. The antenna is mainly used to send and receive radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, and keyboards, are mainly used to receive data input by users and output data to users. It should be noted that some types of terminal devices may not have input and output devices.

When data needs to be sent, the processor 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 sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal 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, and the processor converts the baseband signal into data and processes the data. For ease of description, only one memory and processor are shown in FIG. 13. In actual terminal equipment products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or storage device. The memory may be set independently of the processor, or may be integrated with the processor, which is not limited in the embodiment of the present application.

In the embodiments of the present application, the antenna and radio frequency circuit with the transceiving function can be regarded as the transceiving unit of the terminal device, and the processor with the processing function can be regarded as the processing unit of the terminal device. As shown in FIG. 13, the terminal device includes a transceiver unit 1310 and a processing unit 1320. The transceiver unit may also be referred to as a transceiver, a transceiver, a transceiver, and so on. The processing unit may also be called a processor, a processing board, a processing module, a processing device, and so on. Optionally, the device for implementing the receiving function in the transceiver unit 1310 can be regarded as the receiving unit, and the device for implementing the sending function in the transceiver unit 1310 as the sending unit, that is, the transceiver unit 1310 includes a receiving unit and a sending unit. The transceiver unit may sometimes be called a transceiver, a transceiver, or a transceiver circuit. The receiving unit may sometimes be called a receiver, receiver, or receiving circuit. The transmitting unit may sometimes be called a transmitter, a transmitter, or a transmitting circuit.

It should be understood that the transceiving unit 1310 is used to perform sending and receiving operations on the terminal device side in the foregoing method embodiment, and the processing unit 1320 is used to perform other operations on the terminal device in the foregoing method embodiment except for the transceiving operation.

For example, in an implementation manner, the transceiver unit 1310 may be used to execute S501, S5021, S5023, and S503 in the embodiment shown in FIG. 5, and/or other processes used to support the technology described herein. The processing unit 1220 may be used to perform the steps performed by the transceiver unit 1310 in the embodiment shown in FIG. 5, and/or other processes used to support the technology described herein.

When the terminal device is a chip, the chip includes a transceiver unit and a processing unit. Among them, the transceiver unit may be an input/output circuit or a communication interface; the processing unit is a processor or microprocessor or integrated circuit integrated on the chip.

In this embodiment, reference may be made to the device shown in FIG. 14. As an example, the device can perform functions similar to the processing unit 1320 in FIG. 13. In FIG. 14, the device includes a processor 1410, a data sending processor 1420, and a data receiving processor 1430. The processing unit 901 or the processing unit 1001 in the foregoing embodiment may be the processor 1410 in FIG. 14 and perform corresponding functions. The processing unit 901 or the processing unit 1001 in the foregoing embodiment may be the sending data processor 1420 and/or the receiving data processor 1430 in FIG. 14. Although the channel encoder and the channel decoder are shown in FIG. 14, it can be understood that these modules do not constitute a restrictive description of this embodiment, and are only illustrative.

Fig. 15 shows another form of this embodiment. The terminal device 1500 includes modules such as a modulation subsystem, a central processing subsystem, and a peripheral subsystem. The terminal device in this embodiment can be used as the modulation subsystem therein. Specifically, the modulation subsystem may include a processor 1503 and an interface 1504. The processor 1503 performs the functions of the aforementioned processing unit 901 or the processing unit 1001, and the interface 1504 performs the functions of the aforementioned transceiving unit 902 or the transceiving unit 1002. As another variation, the modulation subsystem includes a memory 1506, a processor 1503, and a program stored in the memory 1506 and running on the processor. The processor 1503 implements the first terminal in the foregoing method embodiment when the program is executed. Device or second terminal device method. It should be noted that the memory 1506 can be non-volatile or volatile, and its location can be located inside the modulation subsystem or in the processing device 1500, as long as the memory 1506 can be connected to the The processor 1503 is fine.

The embodiments of the present application also provide a communication system. Specifically, the communication system includes a terminal device and a network device, or may also include more terminal devices and network devices.

The terminal device and the network device are respectively used to implement the functions of the related devices in FIG. 5 or FIG. 8 described above. For details, please refer to the relevant descriptions in the above method embodiments, which will not be repeated here.

An embodiment of the present application also provides a computer-readable storage medium, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device and the network device in FIG. 5 or FIG. 8.

The embodiments of the present application also provide a computer program product, including instructions, which when run on a computer, cause the computer to execute the method executed by the terminal device and the network device in FIG. 5 or FIG. 8.

The embodiment of the present application provides a chip system. The chip system includes a processor and may also include a memory for implementing the functions of the terminal device and the network device in the foregoing method. The chip system can be composed of chips, or can include chips and other discrete devices.

The methods provided in the embodiments of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented by software, it can be implemented in the form of a computer program product in whole or in part. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on the computer, the processes or functions described in the embodiments of the present invention are generated in whole or in part. The computer may be a general-purpose computer, a dedicated computer, a computer network, network equipment, user equipment, or other programmable devices. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center. Transmission to another website, computer, server or data center via wired (such as coaxial cable, optical fiber, digital subscriber line (DSL for short) or wireless (such as infrared, wireless, microwave, etc.). A 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, data center, etc., integrated with one or more available media. The available medium may be a magnetic medium (for example, a floppy disk, hard disk, Magnetic tape), optical media (for example, digital video disc (DVD for short)), or semiconductor media (for example, SSD).

Obviously, those skilled in the art can make various changes and modifications to the application without departing from the scope of the application. In this way, if these modifications and variations of this application fall within the scope of the claims of this application and their equivalent technologies, this application also intends to include these modifications and variations.

Claims

A method for acquiring system information, characterized in that it includes:

Sending a first request message to the network device, where the first request message is used to request changed first system information from the network side;

Receiving the first system information from the network device.
The method according to claim 1, wherein the first request message carries a first duration, and wherein the first system information changes within the first duration.
The method according to claim 1 or 2, wherein the method further comprises:

Sending a second request message to the network device, where the second request message is used to instruct the network device to no longer send the changed first system information to the communication device.
The method according to any one of claims 1-3, wherein the first request message carries a first number and first indication information, and the first number is a number of a system information block, and the first system The information includes the system information block, and the first indication information is used to instruct the network device to send the changed first system information.
The method according to any one of claims 1-3, wherein the first request message carries a second number and second indication information, and the second number is the number of the system information message, and the first system The information includes the system information message, and the second indication information is used to instruct the network device to send the system information message.
5. The method according to any one of claims 2-5, wherein the method further comprises:

In the first time period, receiving the changed first system information from the network device.
The method according to any one of claims 1 to 6, wherein the first system information is used for positioning of a communication device.
A method for sending system information, characterized in that it includes:

The network device receives a first request message from the communication device, where the first request message is used to request changed first system information from the network side;

In response to the first request message, the network device sends the first system information to the communication device when the first system information changes.
The method according to claim 8, wherein the first request message carries a first duration, and wherein the first system information changes within the first duration.
The method according to claim 8 or 9, wherein the method further comprises:

The network device receives a second request message from the communication device, where the second request message is used to instruct the network device to no longer send the changed first system information to the communication device.
The method according to any one of claims 8-10, wherein the first request message carries a first number and first indication information, and the first number is the number of a system information block, and the first system Information is included in the system information block, and the first indication information is used to instruct the network device to send the changed first system information.
The method according to any one of claims 8-10, wherein the first request message carries a second number and second indication information, the second number is the number of the system information message, and the second indication The information is used to instruct the network device to send the system information message.
The method according to claim 12, wherein, in response to the first request message, the network device sends the first system information to the communication device when the first system information changes, include:

The network device sends a system information message corresponding to the second number to the communication device.
The method according to any one of claims 8-13, wherein the first system information is used for positioning of the communication device.
The method according to any one of claims 9-14, wherein the method further comprises:

The network device does not send the changed first system information after the first time period; or,

After the first period of time, the network device continues to send the changed first system information until the end time of the second period of time is reached, wherein the network device receives requests from multiple communication devices For multiple request messages of the system information, the communication device is one of the multiple communication devices, at least one of the multiple request messages carries at least one duration, and the first duration and the duration The second time length belongs to the at least one time length, and the second time length is the time length with the latest end time in the at least one time length.
A communication device, characterized in that it comprises a transceiver unit and a processing unit, wherein:

The transceiver unit is configured to send a first request message to the network device under the control of the processing unit, and the first request message is used to request changed first system information from the network side;

Under the control of the processing unit, the first system information from the network device is received.
The communication device according to claim 16, wherein the first request message carries a first duration, and wherein the first system information changes within the first duration.
The communication device according to claim 16 or 17, wherein the transceiver unit is further configured to:

Sending a second request message to the network device, where the second request message is used to instruct the network device to no longer send the changed first system information to the communication device.
The communication device according to any one of claims 16-18, wherein the first request message carries a first number and first indication information, and the first number is the number of the system information block, and the first The system information includes the system information block, and the first indication information is used to instruct the network device to send the changed first system information.
The communication device according to any one of claims 16-18, wherein the first request message carries a second number and second indication information, and the second number is the number of the system information message, and the first The system information includes the system information message, and the second indication information is used to instruct the network device to send the system information message.
The communication device according to any one of claims 17-20, wherein the transceiver unit is further configured to:

In the first time period, receiving the changed first system information from the network device.
The communication device according to any one of claims 16-20, wherein the first system information is used for positioning of the communication device.
A communication device, characterized in that it comprises a transceiver unit and a processing unit, wherein:

The transceiver unit is configured to receive a first request message from a communication device under the control of the processing unit, the first request message being used to request changed first system information from the network side;

The processing unit is configured to control the transceiver unit to send the first system information to the communication device when the first system information changes in response to the first request message.
The communication device according to claim 23, wherein the first request message carries a first duration, and wherein the first system information changes within the first duration.
The communication device according to claim 23 or 24, wherein the transceiver unit is further configured to:

Receiving a second request message from the communication device, where the second request message is used to instruct the network device to no longer send the changed first system information to the communication device.
The communication device according to any one of claims 23-25, wherein the first request message carries a first number and first indication information, the first number is the number of the system information block, and the first The system information is included in the system information block, and the first indication information is used to instruct the network device to send the changed first system information.
The communication device according to any one of claims 23-25, wherein the first request message carries a second number and second indication information, and the second number is the number of the system information message, and the second The indication information is used to instruct the network device to send the system information message.
The communication device according to claim 27, wherein in response to the first request message, the processing unit controls the transceiving unit to send all data to the communication device when the first system information changes. When describing the first system information, it is specifically used for:

The processing unit controls the transceiver unit to send a system information message corresponding to the second number to the communication device.
The communication device according to claims 23-28, wherein the first system information is used for positioning of the communication device.
The communication device according to claims 24-29, wherein:

The processing unit is further configured to control the transceiver unit not to send the changed first system information after the first duration; or,

The processing unit is further configured to control the transceiver unit to continue to send the changed first system information after the first duration until the end time of the second duration is reached, wherein the transceiver unit receives A plurality of request messages for requesting the system information from a plurality of communication devices, the communication device is one of the plurality of communication devices, and at least one request message in the plurality of request messages carries at least one Time length, the first time length and the second time length belong to the at least one time length, and the second time length is the time length with the latest end moment in the at least one time length.
A communication device, wherein the communication device includes a processor and a memory, the memory is used to store a computer program, and the processor is used to execute the computer program stored on the memory, so that the device executes The communication method according to any one of claims 1 to 7 or 8 to 15.
A communication system, characterized by comprising the communication device according to one of claims 1-7, and the network device according to one of claims 8-15.
A computer-readable storage medium, characterized in that, the computer-readable storage medium stores a computer program, and when the computer program is executed by a computer, the computer executes as claimed in claims 1-7 or 8-15. Any of the methods described.
A computer program product, characterized in that the computer program product stores a computer program, and when the computer program is executed by a computer, the computer executes any one of claims 1-7 or 8-15. The method described.