WO2022083444A1

WO2022083444A1 - System information acquisition method and user equipment

Info

Publication number: WO2022083444A1
Application number: PCT/CN2021/122589
Authority: WO
Inventors: 张崇铭; 刘仁茂; 常宁娟
Original assignee: 夏普株式会社; 张崇铭
Priority date: 2020-10-20
Filing date: 2021-10-08
Publication date: 2022-04-28
Also published as: CN114449464A

Abstract

Provided are a system information acquisition method and a user equipment. The system information acquisition method is a method for a remote UE acquiring system information from a base station by means of a relay UE. The system information acquisition method comprises the following steps: a remote UE starts a transmission process of an RRC system information request message, and in the process, the remote UE generates an RRC system information request message, and configures content of the message to comprise at least a list of system information (SI)/system information blocks (SIBs) requested by the UE; a relay UE receives a data packet that is sent by the remote UE and that bears an RRC system information request message, and then sends the data packet or the RRC system information request message in the data packet to a base station; and after receiving the RRC system information request message of the remote UE sent by means of the relay UE, the base station sends, to the remote UE, system information requested thereby.

Description

System information acquisition method and user equipment

technical field

The present invention relates to the technical field of wireless communication, and more particularly, to a method for acquiring system information and a corresponding user equipment.

Background technique

In order to provide the service, the base station may provide system information to the UEs in the idle state or inactive state under the coverage of the base station in a broadcast manner. The system information can be broadcast periodically or based on the system information request sent by the UE for the disconnected state. For the UE in the connected state, the base station may also provide system information to the UE in the connected state through dedicated signaling based on a system information request message sent by the UE for the connected state.

In one scenario, a remote UE (remote UE) can communicate with the base station through a relay UE (relay UE).

After the remote UE establishes an RRC connection with the base station through the relay UE, the remote UE is in the connected state, and can send a system information request message in the connected state to the base station, and receive the requested system information sent by the base station through proprietary signaling.

When the remote UE is in the disconnected state, the existing method for obtaining system information in the disconnected state is not suitable for the remote UE, so how to obtain the system information for the remote UE in the disconnected state is a problem that needs to be solved.

SUMMARY OF THE INVENTION

The present invention proposes a solution to the following problems, that is, how to obtain system information for a remote UE in a disconnected state is a problem that needs to be solved and a solution is proposed.

According to an aspect of the present invention, a method for acquiring system information is provided, which is a method for a remote UE to acquire system information from a base station through a relay UE, wherein,

The system information acquisition method includes the following steps:

The remote UE starts the transmission process of the RRC system information request message. In this process, the remote UE generates the RRC system information request message, and the content of the message is set to at least include the list of system information SI/system information block SIB requested by the UE ;

The relay UE receives the data packet carrying the RRC system information request message sent from the remote UE, and then sends the data packet or the RRC system information request message in the data packet to the base station;

After receiving the RRC system information request message of the remote UE sent by the relay UE, the base station sends the requested system information to the remote UE.

In the above system information acquisition method, preferably,

It is set that the content of the message also indicates the information of the remote UE, or carries information to indicate that the request message is generated or sent by the remote UE.

In the above system information acquisition method, preferably,

When the relay UE receives the signaling or user data that carries the RRC system information request message sent from the remote UE, it also receives indication information, indicating that the signaling or data is for the system information request, or the The command or data carries a system information request,

Based on the indication, the relay UE decodes the RRC system information request message contained therein, and obtains the information of the SI/SIB requested by the remote UE therein.

In the above system information acquisition method, preferably,

The base station carries the system information requested by the remote UE in the downlink common channel message, where the type of the common channel message is system information or system information release,

The downlink common channel information is encapsulated into signaling or data is sent to the relay UE through the signaling bearer SRB or the data bearer DRB. After the relay UE receives the data or signaling carrying the downlink common channel message, the relay UE and The near field communication connection established between the remote UEs is sent to the remote UE.

In the above system information acquisition method, preferably,

The base station sends an RRC message to the relay UE, and the message carries the SI/SIB requested by the remote UE,

After receiving the RRC message, the relay UE sends the SI/SIB carried in the RRC message to the remote UE indicated in the RRC message.

In the above system information acquisition method, preferably,

The base station sends an RRC message to the relay UE, and the message carries the SI/SIB list requested by the remote UE,

After receiving the RRC message, the relay UE receives the corresponding SI/SIB in the SI/SIB list requested by the remote UE at the corresponding scheduling time according to the scheduling information of the SIB indicated in SIB1, and then uses the obtained SI/SIB. The SIB is sent to the remote UE indicated in the RRC message.

In the above system information acquisition method, preferably,

When the relay UE receives the signaling or data carrying the RRC system information request message sent from the remote UE, when the relay UE is in the RRC idle state/inactive state, it triggers the establishment or restoration of the RRC connection process, so that The relay UE enters the connected state.

In the above system information acquisition method, preferably,

When the relay UE receives the signaling or data carrying the RRC system information request message sent from the remote UE, it does not trigger the establishment or restoration of the RRC connection.

In the above system information acquisition method, preferably,

When the UE acquires the system information, it is determined whether the UE is a remote UE.

According to another aspect of the present invention, there is provided a user equipment, comprising: a processor; and

memory, storing instructions,

When the above-mentioned instruction is executed by the above-mentioned processor, the above-mentioned user equipment executes the above-described method for obtaining system information.

According to the system information acquisition method and the corresponding user equipment involved in the present disclosure, a remote UE in a disconnected state can effectively acquire system information.

Description of drawings

FIG. 1 is a schematic diagram showing a communication scenario between a remote UE, a relay UE and a base station.

FIG. 2 is a flowchart showing a system information acquisition method according to an embodiment of the present invention.

FIG. 3 is a schematic structural block diagram of the user equipment involved in the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of brevity, detailed descriptions of well-known technologies not directly related to the present invention are omitted to prevent obscuring the understanding of the present invention.

Before the specific description, some terms mentioned in the present invention are explained as follows. Unless otherwise indicated, terms referred to in the present invention have the following meanings.

UE User Equipment User Equipment

NR New Radio new generation wireless technology

LTE Long Term Evolution long term evolution technology

eLTE Enhanced Long Term Evolution Enhanced Long Term Evolution Technology

RRC Radio Resource Control Radio Resource Control (layer)

MAC Medium Access Control Media Access Control (layer)

MAC CE MAC Control Element MAC Control Element

SDAP Service Data Adaptation Protocol Business Data Adaptation Layer Protocol

Hereinafter, the NR mobile communication system and its subsequent evolved versions are used as an example application environment, and the base station and UE equipment supporting NR are used as examples to specifically describe various embodiments according to the present invention. However, it should be pointed out that the present invention is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as eLTE, communication systems, or NB-Iot systems, or LTE-M systems. And it can be applied to other base stations and UE devices, such as base stations and UE devices supporting eLTE/NB-Iot/LTE-M.

Get system information

The system information block SIB is classified into two types: broadcast or non-broadcast. The indication information corresponding to a SIB will indicate whether the SIB is currently being broadcasted or not being broadcasted. For the SIB that indicates the current broadcast, the UE can obtain the corresponding SIB according to the scheduling information of the SIB provided in SIB1. The scheduling information contains the information of the time and frequency of SIB reception, so the UE can receive the broadcast SIB at the corresponding time and frequency.

For the SIB indicated that it is not currently broadcast, if the UE needs to acquire the SIB, there may be different ways according to the RRC connection state of the UE.

If the UE is in an idle state (IDLE) or an inactive state (INACTIVE), the UE may generate an RRC system information request message (RRCSystemInfoRequest message) and send it to the base station. The RRCSystemInfoRequest message contains the list of SIBs requested by the UE. After receiving the acknowledgment information (acknowledge) of the message, the UE can acquire the corresponding SIB according to the scheduling information of the SIB provided in the SIB1.

If the UE is in the connected state, the UE can generate a dedicated SIB request message (DedicatedSIBRequest message) and send it to the base station. The DedicatedSIBRequest message contains the list of SIBs requested by the UE. Then the UE can acquire the corresponding SIB according to the scheduling information of the SIB provided in the SIB1, or receive the RRC reconfiguration message sent by the base station, and the message carries the SIB requested by the UE.

near field communication

Remote UE and relay UE are wirelessly connected through near field communication to transmit data or signaling. The near field communication method mentioned in this article mainly refers to a side link (sidellink) connection. It can also be a WIFI connection, or other connection methods. The reference point based on the sidelink connection between the UE and the UE is called PC5, so the connection between the remote UE and the relayUE can be called the PC5 connection.

Uu RRC connection and status

The reference point between the UE and the radio access network is called Uu, so the connection between the UE and the radio access network is called a Uu connection. In the Uu connection, according to the state of the Uu RRC connection, the state of the UE can be divided into an idle state (RRC_IDLE state), an inactive state (RRC_INACTIVE state), and a connected state (RRC_CONNECTED state). After the RRC connection is established, the UE may be in INACTIVE or CONNECTED state. If no RRC connection is established, the UE is in IDLE state.

After the RRC connection is established between the Remote UE and the radio access network, the remote UE can be in the INACTIVE or CONNECTED state; if the RRC connection is not established, the UE is in the IDLE state. Similarly, the relay UE can also be in one of these three states.

It should be noted that when the remote UE is in the RRC connected state, the relay UE must be in the RRC connected state; when the remote UE is in the RRC INACTIVE/IDLE state, the relay UE can be in any of the three states of RRC connected state, INACTIVE/IDLE A sort of.

In addition, the PC5 connection between the remote UE and the relay UE does not affect the Uu connection of the remote UE or the relay UE, and the two connections are independent.

A typical scenario described in this paper is shown in Figure 1. The left side is the remote UE, the middle is the relay UE, and the right side is the base station, which communicates with the relay UE on behalf of the radio access network. Remote UE and relay UE are connected through PC5. The ellipse indicates the coverage area of the base station. Since the remote UE is not within the coverage of the base station, it cannot communicate with the base station directly, thus requiring the relay UE to provide relay services. In another scenario, the remote UE is in the boundary area of the ellipse shown in Figure 1. In this scenario, the remote UE can be considered to be within the coverage of the base station, but the signal with the base station is not optimal, or If the time is short and long, the relay UE is also required to provide relay services.

Information transfer

After the RRC connection is established between the Remote UE and the base station, the information sent by the remote UE to the base station and the information sent by the base station to the remote UE are transmitted through the relay UE. In this article, the specific delivery method is not limited. The following approach can be used as an example of information transfer.

Remote UE sends information to base station

The Remote UE generates a Uu PDCP PDU, and the data packet is submitted to the RLC layer of PC5 for encapsulation, and then sent to the relay UE through PC5MAC and PC5PHY.

The Relay UE receives a PC5 data packet, decapsulates it through the peer PC5 RLC, and obtains a Uu PDCP PDU. Through the adaptive layer of the relay UE, the Uu PDCP PDU can be encapsulated, for example, the header of the adaptive layer is added. , carrying the identification information of the remote UE, and then sent to the Uu RLC for encapsulation, and sent to the lower layer, and sent to the base station. After receiving the data packet, the base station unpacks it, and can know that the data packet comes from the remote UE according to the information in the header of the adaptive layer, and then sends it to the corresponding PDCP entity for decoding to obtain the information.

The base station sends information to the Remote UE

The base station generates Uu PDCP PDU, and the data is sent to the adaptive layer encapsulation on the base station side, for example, the header of the adaptive layer is added, which carries the identification information of the remoteUE. It is then sent to the Uu RLC for encapsulation, and sent to the lower layer to be sent to the relay UE.

The relay UE receives the Uu data packet from the base station, and decapsulates it through the peer Uu RLC to obtain the data packet carrying the adaptive header. Through the adaptive layer of the relay UE, the data packet can be decapsulated to identify its belonging The identification information of the remote UE. After taking out the information of the adaptive packet header, the relay UE sends the obtained Uu PDCP PDU to the PC 5 RLC for encapsulation, and sends it to the lower layer to send the remote UE. After the Remote UE receives the data packet, it unpacks it to obtain the Uu PDCP PDU, and then sends it to the corresponding PDCP entity for decoding to obtain the information.

The data packet here may contain RRC signaling or user data.

Example 1

This embodiment provides a method for acquiring system information, which is a method for a remote UE to acquire system information from a base station through a relay UE. As shown in FIG. 2 , the method for acquiring system information includes the following steps.

S201: In order to obtain system information, the remote UE initiates the transmission of the RRCSystemInfoRequest message. In this process, the remote UE generates an RRCSystemInfoRequest message, and the content of the message is set to include at least the list of system information or system information blocks requested by the UE, and optionally, the information of the remote UE can also be indicated, such as the remote UE's Identity information, geographic location information, etc., or carry information indicating that the request message is generated or sent by the remote UE. Such a message generation process is generally processed in the Uu RRC layer, and then the UE submits the information to the lower layer (lower layer) below the Uu RRC layer for transmission. Since the remote UE needs to submit the information to the relay UE, the lower layer here can be the PC5-RLC layer or the PC5-RRC layer.

The remote UE and the relayUE can be connected through near field communication. Therefore, the RRCSystemInfoRequest message generated by the remote UE is submitted to the relay UE.

S202: The Relay UE receives a data packet sent from the remote UE, and the data packet carries the RRCSystemInfoRequest message. Then, the relay UE sends the data packet or the RRCSystemInfoRequest message in the data packet to the base station. The specific operation method may be that the relay UE extracts the PDU encapsulated with the RRCSystemInfoRequest message from the data or signaling, and then passes the relay UE and the base station to the base station. The signaling bearer (SRB) or data bearer (DRB) established between them is sent to the base station.

Optionally, when the Relay UE receives the signaling or user data that is sent from the remote UE and carries the aforementioned RRCSystemInfoRequest message, it also receives indication information, indicating that the signaling or data is for a system information request, or the information is The system information request is carried in the command or data. Based on the indication, the relay UE can decode the RRCSystemInfoRequest message contained therein, and obtain the information of the SI/SIB requested by the remote UE, for example, obtain the SI/SIB request list therein.

S203: After receiving the system information request message (RRCSystemInfoRequest message) of the remote UE sent by the relay UE, the base station sends the requested system information to the remote UE. The specific sending method may be:

The first way is to carry the requested system information in a downlink common channel message (DL-CCCH message), where the type (type) of the common channel message is system information or system information release. This downlink common channel information can be encapsulated into signaling or data sent to the relay UE through SRB/DRB, and the relay UE receives the data or signaling carrying the downlink common channel message through the near field established between the relay UE and the remote UE. The communication connection is sent to the remote UE. In this way, the remote UE obtains the requested system information.

Mode 2, the base station sends an RRC message to the relay UE, the message carries the SI/SIB requested by the remote UE, and optionally, the base station also indicates the relevant information of the remote UE in the message, such as the identity of the remote UE. information.

After receiving the RRC message, the Relay UE sends the SI/SIB carried in it to the remote UE indicated in it. In this way, the remote UE can also obtain the requested system information.

Mode 3, the base station sends an RRC message to the relay UE, the message carries the SI/SIB list requested by the remote UE, and optionally, the base station also indicates the relevant information of the remote UE in the message, such as the identity of the remote UE identification information.

After receiving the RRC message, the Relay UE receives the corresponding SI/SIB in the SI/SIB list requested by the remote UE at the corresponding scheduling time according to the scheduling information of the SIB indicated in SIB1. Preferably, after the relay UE receives the RRC message, for the SI/SIB listed on the SI/SIB list carried in the message, if the relay UE side has received or saved a valid version, then the relay UE can directly send it to The remote UE indicated in the RRC message; for the SI/SIB listed on the SI/SIB list carried in the message, if the relay UE side has not received or saved it, or there is no valid version, then the relay UE can directly use the SIB1 The scheduling information of the SIB indicated in , receive the corresponding SI/SIB in the SI/SIB list requested by the remote UE at the corresponding scheduling moment, or the relay UE obtains these SI/SIB by the method of "system information acquisition" described above. SIB. Then, the relay UE sends the obtained SI/SIB to the remote UE indicated in the RRC message. The Relay UE can send multiple messages to the remote UE, respectively carrying the SI/SIB requested by the remote UE, or after obtaining all or most of the SI/SIB requested by the remote UE, use a message to carry the requested SI/SIB SI/SIB, sent to remote UE. In this way, the remote UE can also obtain the requested system information.

Example 2

On the basis of Embodiment 1, when the Relay UE receives the signaling or data carrying the aforementioned RRCSystemInfoRequest message sent from the remote UE, the relay UE may be in the RRC idle state/inactive state.

Therefore, when the relay UE receives the above-mentioned RRCSystemInfoRequest message signaling or data sent from the remote UE, the relay UE can trigger the establishment or restoration of the RRC connection process (in the idle state, trigger the establishment of the RRC connection, in the inactive state, Trigger to restore the RRC connection), so that the relay UE enters the connected state.

The specific implementation may be that the relay UE receives the PC5 RRC signaling sent by the remote UE to the relay UE through near field communication. For example, such signaling can request the relay UE to perform a relay operation, or is called relay request signaling . A container information element (container IE) is carried in the signaling, and the container IE encapsulates a message sent by the remote UE to the base station, such as the aforementioned system information request message, or an RRC connection establishment request message, etc. When receiving such PC5 RRC signaling, the relay UE (the PC5 RRC layer) can indicate this information to the upper layer (such as the PC5-S layer, or the application layer), which can be an indication that it is received and sent to the base station container, or indicates that a relay request is received.

Next, the RRC layer can be instructed by the upper layer of the relay UE to trigger the process of establishing or restoring the RRC connection, and the cause value of the establishment can be a relay request.

It should be noted that this embodiment can also be used alone to solve the problem of when the relay UE in the RRC idle or INACTIVE state triggers the establishment of the RRC connection.

Example 3

On the basis of Embodiment 2, when the relay UE receives the aforementioned RRCSystemInfoRequest message signaling sent by the remote UE, the relay UE does not need to trigger the establishment/restoration of the RRC connection. The specific implementation method can be

The relay UE receives the PC5 RRC signaling sent by the remote UE to the relay UE through near field communication. The signaling carries a container IE, which encapsulates the message sent by the remote UE to the base station, such as the aforementioned system information request message, or the RRC connection establishment message.

In addition, the signaling also carries an indication information, indicating the type of information encapsulated/carried in the container IE, for example, the indication carries a system information request, or the indication carries an RRC connection establishment/recovery request.

In one case:

When the remote UE is encapsulated in the container IE and sent to the system information request message, the above indication information indicates the system information request, and it can also indicate that the system information request is carried by not carrying the indication information. Based on the indication, the relay UE can decode the RRCSystemInfoRequest message contained therein, and obtain the information of the SI/SIB requested by the remote UE, for example, obtain the SI/SIB request list therein.

When the relay UE is in an idle/inactive state at this time, the relay UE can obtain the SI/SIB requested by the remote UE according to the SI/SIB list requested by the remote UE. And after receiving the SI/SIB, it is sent to the remote UE. For the specific acquisition process, refer to the acquisition of system information described above.

As a supplement, when the relay UE is in the connected state at this time, as described in Embodiment 1, the relay UE can send the information RRCSystemInfoRequest message to the base station, and then the remote UE can obtain the requested SI/ SIB.

In addition, since the relay UE can know the list information of SI/SIB requested by the remote UE through the indication information, the relay UE can also use it as the SI/SIB requested by itself, and trigger the acquisition process of the system information in the connected state . And after receiving the corresponding SI/SIB, send it to the remote UE.

In another case:

When the RRC connection establishment request sent by the remote UE to the base station is encapsulated in the container IE, the above indication information may indicate the RRC connection request, or it may not carry such an indication, then when the relay UE is in an idle/inactive state at this time , when receiving such PC5 RRC signaling, the relay UE (the PC5 RRC layer) can indicate this information to the upper layer (upper layer, such as the PC5-S layer, or the application layer), which can indicate that it is received and sent to The container of the base station, or a relay request is received.

Next, the upper layer of the relay UE may instruct the RRC layer to trigger the process of establishing or restoring the RRC connection, and the cause value of the establishment may be a relay request.

Example 4

When a UE acquires system information, it needs to determine whether it is a remote UE, or whether it needs to acquire system information through a relay UE.

In one case, the UE can communicate with the base station without relaying the UE, so the UE is not a remote UE. In this case, the UE needs to perform the following operations when requesting system information:

Apply the configuration information of the common time synchronization timer contained in SIB1

Apply the configuration of the common control channel

Start the transmission of RRCSystemInfoRequest message

After receiving the confirmation information of RRCSystemInfoRequest message, start to obtain the requested SI

In one case, the UE needs to pass the relay UE to obtain system information from the base station, so the UE is the remote UE. In this case, the UE needs to perform the following operations when requesting system information:

Start the transmission of RRCSystemInfoRequest message

And optionally, the information of the remote UE is indicated when the content of the RRCSystemInfoRequest message is set, such as the identity identifier or geographic location information of the remote UE.

This embodiment can be used alone to make determination when the UE triggers to acquire system information, or used in combination with Embodiment 1.

Example 5

On the basis of Embodiment 4, how the UE determines that it is a remote UE or whether it needs to obtain system information through the relay UE may further include:

The UE measures the signal sent by the base station;

When the measured value is lower than a pre-configured or defined threshold, the UE can determine that it needs to obtain system information through the relay UE; when the measured value is higher than or not lower than the threshold, the UE can directly obtain the system information .

Or is it

When the measured value is higher than a preconfigured or defined threshold value 1, but lower than the preconfigured or defined threshold value 2, the UE can determine that it needs to obtain system information through the relay UE; when the measured value is higher than or not When the measurement value is lower than the threshold value 2, the UE can directly obtain the system information; when the measurement value is lower than the threshold value 1, the UE needs to obtain the system information through the relay UE, and establish an RRC connection with the base station through the relay UE.

The signal sent by the base station in the above process can be a cell synchronization signal, such as a PSS (Primary Synchronization Signal, primary synchronization signal) of a cell or an SSS (Secondary Synchronization Signal, a secondary synchronization signal); it can also be a synchronization signal block (Synchronization signal block, SS block).

The measurement quantity of the signal by the UE may be the reference signal received power (RSRP Reference Signal Received Power), or the reference signal received quality (RSRQ Reference Signal Received Quality), etc.

FIG. 3 is a schematic structural block diagram of the user equipment involved in the present invention. As shown in FIG. 3 , the user equipment UE300 includes a processor 301 and a memory 302 . The processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, or the like. The memory 302 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like. The memory 302 has program instructions stored thereon. When the instruction is executed by the processor 301, the above method described in detail in the present invention and executed by the user equipment can be executed.

A program running on a device according to the present invention may be a program that causes a computer to implement the functions of the embodiments of the present invention by controlling a central processing unit (CPU). The program or information processed by the program may be temporarily stored in volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory systems.

A program for realizing the functions of the embodiments of the present invention can be recorded on a computer-readable recording medium. The corresponding functions can be realized by causing a computer system to read programs recorded on the recording medium and execute the programs. The so-called "computer system" as used herein may be a computer system embedded in the device, and may include an operating system or hardware (eg, peripheral devices). The "computer-readable recording medium" may be a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a recording medium that dynamically stores a program for a short period of time, or any other recording medium readable by a computer.

The various features or functional blocks of the devices used in the above-described embodiments may be implemented or performed by electrical circuits (eg, monolithic or multi-chip integrated circuits). Circuits designed to perform the functions described in this specification may include general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination of the above. A general-purpose processor may be a microprocessor or any existing processor, controller, microcontroller, or state machine. The above circuit may be a digital circuit or an analog circuit. In the event that new integrated circuit technologies emerge as a result of advances in semiconductor technology that replace existing integrated circuits, one or more embodiments of the present invention may also be implemented using these new integrated circuit technologies.

Furthermore, the present invention is not limited to the above-described embodiments. Although various examples of the described embodiments have been described, the invention is not limited thereto. Fixed or non-mobile electronic equipment installed indoors or outdoors can be used as terminal equipment or communication equipment, such as AV equipment, kitchen equipment, cleaning equipment, air conditioners, office equipment, vending machines, and other household appliances.

As above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings. However, the specific structure is not limited to the above-mentioned embodiment, and the present invention also includes any design changes that do not deviate from the gist of the present invention. In addition, various modifications can be made to the present invention within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. In addition, the components described in the above-described embodiments having the same effect may be substituted for each other.

Claims

A system information acquisition method is a method for a remote UE to acquire system information from a base station through a relay UE, wherein,

The system information acquisition method includes the following steps:

The remote UE starts the transmission process of the RRC system information request message. In this process, the remote UE generates the RRC system information request message, and the content of the message is set to at least include the list of system information SI/system information block SIB requested by the UE ;

The relay UE receives the data packet carrying the RRC system information request message sent from the remote UE, and then sends the data packet or the RRC system information request message in the data packet to the base station;

After receiving the RRC system information request message of the remote UE sent by the relay UE, the base station sends the requested system information to the remote UE.
The system information acquisition method according to claim 1, wherein,

It is set that the content of the message also indicates the information of the remote UE, or carries information to indicate that the request message is generated or sent by the remote UE.
The system information acquisition method according to claim 2, wherein,

When the relay UE receives the signaling or user data that carries the RRC system information request message sent from the remote UE, it also receives indication information, indicating that the signaling or data is for the system information request, or the The command or data carries a system information request,

Based on the indication, the relay UE decodes the RRC system information request message contained therein, and obtains the information of the SI/SIB requested by the remote UE therein.
The system information acquisition method according to any one of claims 1 to 3, wherein,

The base station carries the system information requested by the remote UE in the downlink common channel message, where the type of the common channel message is system information or system information release,

The downlink common channel information is encapsulated into signaling or data is sent to the relay UE through the signaling bearer SRB or the data bearer DRB. After the relay UE receives the data or signaling carrying the downlink common channel message, the relay UE and The near field communication connection established between the remote UEs is sent to the remote UE.
The system information acquisition method according to any one of claims 1 to 3, wherein,

The base station sends an RRC message to the relay UE, and the message carries the SI/SIB requested by the remote UE,

After receiving the RRC message, the relay UE sends the SI/SIB carried in the RRC message to the remote UE indicated in the RRC message.
The system information acquisition method according to any one of claims 1 to 3, wherein,

The base station sends an RRC message to the relay UE, and the message carries the SI/SIB list requested by the remote UE,

After receiving the RRC message, the relay UE receives the corresponding SI/SIB in the SI/SIB list requested by the remote UE at the corresponding scheduling time according to the scheduling information of the SIB indicated in SIB1, and then uses the obtained SI/SIB. The SIB is sent to the remote UE indicated in the RRC message.
The system information acquisition method according to any one of claims 1 to 3, wherein,

When the relay UE receives the signaling or data carrying the RRC system information request message sent from the remote UE, when the relay UE is in the RRC idle state/inactive state, it triggers the establishment or restoration of the RRC connection process, so that The relay UE enters the connected state.
The system information acquisition method according to claim 7, wherein,

When the relay UE receives the signaling or data carrying the RRC system information request message sent from the remote UE, it does not trigger the establishment or restoration of the RRC connection.
The system information acquisition method according to any one of claims 1 to 3, wherein,

When the UE acquires the system information, it is determined whether the UE is a remote UE.
A user equipment comprising:

processor; and

memory, storing instructions,

When the above-mentioned instruction is executed by the above-mentioned processor, the above-mentioned user equipment executes the system information acquisition method according to any one of claims 1 to 9.