๐๐ ๐๐๐ญ๐ฐ๐จ๐ซ๐ค ๐๐ง๐ญ๐ซ๐ฒ ๐๐ซ๐จ๐๐๐๐ฎ๐ซ๐
5G Network Entry refers to the process and procedures involved in connecting a user device to a 5G network. This involves several steps and interactions between the device (User Equipment, UE) and the network infrastructure (including the gNB, which is the 5G base station, and the core network).
๐ฏ๐๐๐โ๐ ๐ ๐๐๐๐-๐๐๐๐๐ ๐๐๐๐๐๐๐๐ ๐๐ ๐๐๐ 5๐ฎ ๐๐๐๐๐๐๐ ๐๐๐๐๐ ๐๐๐๐๐๐๐:
๐บ๐๐๐ 1 -๐ช๐๐๐ ๐บ๐๐๐๐๐ ๐๐๐
๐บ๐๐๐๐๐๐๐๐:
The UE searches for available cells and selects the best one based on signal strength and quality. This involves synchronization with the cellโs primary and secondary synchronization signals (PSS and SSS).
๐บ๐๐๐ 2 - ๐บ๐๐๐๐๐ ๐ฐ๐๐๐๐๐๐๐๐๐๐ ๐จ๐๐๐๐๐๐๐๐๐๐:
The UE decodes the Master Information Block (MIB) and System Information Blocks (SIBs) to get essential information about the network, such as cell identity, configuration parameters, and access restrictions.
๐บ๐๐๐ 3 - ๐น๐๐๐
๐๐ ๐จ๐๐๐๐๐ ๐ท๐๐๐๐๐
๐๐๐ (๐น๐จ๐ช๐ฏ):
The UE initiates a Random Access Channel (RACH) procedure to request access to the network. This involves sending a RACH preamble to the gNB.
The gNB responds with a Random Access Response (RAR), which includes timing advance information and an uplink grant for the UE to send its initial message.
๐บ๐๐๐ 4- ๐ช๐๐๐๐๐๐๐๐๐ ๐ฌ๐๐๐๐๐๐๐๐๐๐๐๐:
RRC Connection Setup: The UE sends an RRC Connection Request message to the gNB, which responds with an RRC Connection Setup message. The UE then sends an RRC Connection Setup Complete message to confirm the connection.
NAS Signaling: The UE and the core network exchange Non-Access Stratum (NAS) messages for authentication and security procedures. This includes the Authentication Request/Response and Security Mode Command/Complete messages.
๐บ๐๐๐ 4 - ๐จ๐๐๐๐๐๐๐๐๐๐๐๐๐ ๐๐๐
๐บ๐๐๐๐๐๐๐
๐บ๐๐๐ 5 - ๐ฐ๐๐๐๐๐๐ ๐น๐๐๐๐๐๐๐๐๐๐๐
๐บ๐๐๐ 6 - ๐ท๐ซ๐ผ ๐บ๐๐๐๐๐๐ ๐บ๐๐๐๐
Steps 4, 5 &6 will be discussed in the next post.
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