CN-122002505-A - System message transmission method, terminal and network side equipment

Abstract

The invention discloses a transmission method of system information, a terminal and network side equipment, which are used for avoiding the problem of ephemeris information receiving failure caused by frequency deviation and time delay change rate and accelerating the access of the terminal to a service cell. The method is applied to a terminal and comprises the steps of receiving a target system message, wherein the target system message comprises ephemeris information of a service cell, the time slot length between the target system message and an SSB message is smaller than that between an SIB19 message and the SSB message, and pre-compensating the service cell according to the ephemeris information so as to establish uplink synchronization with the service cell.

Inventors

• YAN HONG
• TONG JIANFEI
• LIU XIANLING
• XU XIAOFAN
• HAO XUEKUN

Assignees

• 上海卫星互联网研究院有限公司

Dates

Publication Date

20260508

Application Date

20241107

Claims (14)

1. 1. A method for transmitting a system message, which is applied to a terminal, the method comprising: Receiving a target system message, wherein the target system message comprises ephemeris information of a service cell, and the time slot length between the target system message and an SSB message is smaller than that between an SIB19 message and the SSB message; And pre-compensating the service cell according to the ephemeris information so as to establish uplink synchronization with the service cell.
2. 2. The method of claim 1, wherein the step of determining the position of the substrate comprises, The target system message is an SIB n message, wherein n is an integer, and n is more than or equal to 1 and less than or equal to 18.
3. 3. The method of claim 1, wherein the target system message is a SIB1 message.
4. 4. The method of claim 1, wherein the ephemeris information comprises any one or more of: cell access parameters; Service time information; Cell location information; Neighbor cell information.
5. 5. The method of claim 1, wherein pre-compensating the serving cell based on the ephemeris information comprises: And pre-compensating at least one of delay and Doppler frequency shift of the serving cell according to the ephemeris information.
6. 6. The method of claim 5, wherein pre-compensating at least one of delay and doppler shift of the serving cell based on the ephemeris information, comprises: determining the relative position relation between the terminal and the service cell according to the ephemeris information; And pre-compensating at least one of delay and Doppler frequency shift of the serving cell according to the relative position relation.
7. 7. A network access method, applied to a network side device, the method comprising: determining ephemeris information of a serving cell; And sending a target system message to the terminal, wherein the target system message comprises ephemeris information of a service cell, and the time slot length between the target system message and the SSB message is smaller than that between the SIB19 message and the SSB message.
8. 8. The method of claim 7, wherein the step of determining the position of the probe is performed, The target system message is an SIB n message, wherein n is an integer, and n is more than or equal to 1 and less than or equal to 18.
9. 9. The method of claim 7, wherein the target system message is a SIB1 message.
10. 10. The method of claim 7, wherein the ephemeris information comprises any one or more of: cell access parameters; Service time information; Cell location information; Neighbor cell information.
11. 11. The method of claim 7, wherein the sending the target system message to the terminal comprises: adding the ephemeris information to a target system message; And sending the target system message to a terminal.
12. 12. A terminal, characterized in that it comprises a processor and a memory, said memory being adapted to store a program executable by said processor, said processor being adapted to read the program in said memory and to perform the steps of the method according to any one of claims 1-6.
13. 13. A network side device, characterized in that the terminal comprises a processor and a memory, the memory is used for storing a program executable by the processor, and the processor is used for reading the program in the memory and executing the steps of the method according to any one of claims 7-11.
14. 14. A computer storage medium having stored thereon a computer program, which when executed by a processor performs the steps of the method according to any of claims 1-11.

Description

System message transmission method, terminal and network side equipment Technical Field The present invention relates to the field of mobile communications technologies, and in particular, to a method, a terminal, and a network side device for transmitting a system message. Background In a 5G (5 th-generation) system, system messages are classified into 3 types, minimum system messages (MSI, minimum System Information), remaining minimum system messages (RMSI, REMAINING MINIMUM SYSTEM INFORMATION), and other system messages (OSI, on-DEMAND SYSTEM Information). RMSI includes a master message block (MIB, master Information Block) and a system message block 1 (SIB 1, system Information Block Type 1), which are the most basic information. OSI includes SIB 2-SIB 14, and SIB 15-SIB 21 is added in Release 17 version, wherein SIB19 message contains information related to Non-terrestrial network (Non-TERRESTRIAL NETWORKS, NTN). In the current NTN version, this ephemeris information is the necessary information for the terminal to initiate a connection. The terminal needs to calculate the relative position relation between the access satellite and the terminal in advance by the cell related to the ephemeris in the SIB19 to perform pre-compensation of time delay and Doppler so as to initiate uplink initial access, and when the SIB1 and the SIB19 are far away in time domain, namely the SIB19 is located far away from a synchronous signal and a PBCH block (SSB), due to the high-speed movement of the satellite, a certain frequency offset time delay change rate exists, and the success rate of SIB19 reception can be influenced. Disclosure of Invention The invention provides a transmission method of system information, a terminal and network side equipment, which are used for avoiding the problem of ephemeris information receiving failure caused by frequency deviation and time delay change rate and accelerating the access of the terminal to a service cell. In a first aspect, a method for transmitting a system message provided by an embodiment of the present invention is applied to a terminal, where the method includes: Receiving a target system message, wherein the target system message comprises ephemeris information of a service cell, and the time slot length between the target system message and an SSB message is smaller than that between an SIB19 message and the SSB message; And pre-compensating the service cell according to the ephemeris information so as to establish uplink synchronization with the service cell. According to the embodiment, the ephemeris information is sent through the target system message adjacent to the SSB in the time domain, so that the problem that the success rate of SIB19 reception is affected when SIB19 is located at a position far away from the SSB is solved, and the access of the terminal to the service cell is quickened. As an alternative embodiment, the target system message is a SIB n message, where n is an integer and 1≤n≤18. The embodiment can multiplex the ephemeris information of the existing system message transmission service cell, and can also transmit the ephemeris information of the service cell by adding the system message, so that the problem of ephemeris information receiving failure caused by frequency offset and time delay change rate can be avoided compared with the SIB19 message, and the terminal access to the service cell is quickened. Multiplexing existing system messages can reduce signaling overhead while accelerating access of terminals to serving cells. As an alternative embodiment, the target system message is a SIB1 message. In this embodiment, the ephemeris information of the serving cell is received from the SIB1 message, and because the SIB1 message is adjacent to the time domain position of the SSB message, after the initial synchronization information is obtained by using the SSB message, the ephemeris information can be directly obtained from the SIB1 message in the adjacent time domain position, so that the potential receiving failure problem caused by the frequency offset and the time delay change rate is avoided, and the terminal access is accelerated. As an alternative embodiment, the ephemeris information may comprise any one or more of the following: cell access parameters; Service time information; Cell location information; Neighbor cell information. As an optional implementation manner, the pre-compensating the serving cell according to the ephemeris information includes: And pre-compensating at least one of delay and Doppler frequency shift of the serving cell according to the ephemeris information. As an alternative embodiment, the pre-compensating at least one of delay and doppler shift of the serving cell according to the ephemeris information includes: determining the relative position relation between the terminal and the service cell according to the ephemeris information; And pre-compensating at least one of delay and Doppler frequency shift