Cell access method and terminal

Abstract

Embodiments of the present invention provide a cell access method and terminal, wherein the method includes: selecting a target cell to be attached at a current 5G frequency point, receiving a SIB1 message sent by the target cell, and saving measurement information of the target cell, in the SIB1 information Configure the sending mode of the OSI message to be non-broadcast; initiate a random access procedure to the target cell to obtain the OSI message, and if the OSI message fails to be obtained, judge whether the signal quality of the target cell has changed according to the saved measurement information; In the flight or return to the service area scenario, if the signal quality of the target cell is not weakened, the random access procedure is initiated to the target cell again. If the OSI message is obtained successfully, the system message collection and network attachment are performed in the target cell. The embodiments of the present invention enable the terminal to select a cell with better and more stable signals to camp on, thereby laying a good foundation for subsequent user service experience.

Description

technical field [0001] The present invention relates to the technical field of communication, and more specifically, to a cell access method, a cell access method and a terminal. Background technique [0002] Compared with 4G LTE, one of the design ideas of 5G NR is to minimize the signal "always on" in order to reduce system overhead (including air interface resources, equipment power consumption, etc.). Therefore, 5G NR has great changes in system message design. 5G NR divides system messages into two categories: minimum SI (MIB and SIB1) and other SI (OSI). [0003] Among them, SIB1 provides the configuration necessary for initial random access of the terminal, such as PRACH resources, OSI scheduling information and other information, and the minimum SI is broadcast periodically. OSI provides information such as cell reselection parameters (including same frequency and different frequency), public alarms, etc. There are three ways to send OSI: periodic broadcast, on-dem...

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Problems solved by technology

[0004] Therefore, when the terminal fails in the random access process, it will cause the terminal to attach to the network for a long time or the terminal service recovery will be slow

Specifically, in the scenario where the terminal is turned on, unflighted, and returns to the service area, after receiving SIB1, the terminal will obtain the OSI it needs through random access. If the message fails to be received, the cell will be added to the cell prohibition list, and the initial cell selection will be performed again. In this case, the waiting time will be relatively long (second level), which will cause the terminal to attach to the network for too long

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