State of RRC in LTE
RRC uses the following states:
RRC_Idle:
•The UE is not connected. There is no radio link.
•The network knows that the UE is present on the network and is able to reach it in case of incoming call.
•The UE switches in idle mode when it is connected and there is no traffic to save radio resources and its battery.
RRC_Idle:
•The UE is not connected. There is no radio link.
•The network knows that the UE is present on the network and is able to reach it in case of incoming call.
•The UE switches in idle mode when it is connected and there is no traffic to save radio resources and its battery.
RRC_Connected
•The UE has an e-UTRAN-RRC connection.
•The network can transmit/receive data to/from the UE and knows its location at the cell level.
•The network manages the mobility with handover.
RRC_Connected
•The UE has an e-UTRAN-RRC connection.
•The network can transmit/receive data to/from the UE and knows its location at the cell level.
•The network managesDiagram
The LTE UE could have one of the two following states:
- RRC Connected, when it has a RRC connection with a given eNB
- RRC IDLE when it has no valid RRC link with any eNB.
Overview of RRC in LTE
RRC (Radio Resource Control) in LTE manages communication between the user equipment (UE) and the network. It’s responsible for setting up, maintaining, and releasing connections. You’ll find it handling tasks like cell selection, mobility management, and handovers. Without RRC, there would be no coordination for sending or receiving data.
RRC States in LTE
There are mainly two RRC states: RRC_CONNECTED and RRC_IDLE. In RRC_CONNECTED, the UE is actively communicating with the network, while in RRC_IDLE, the device is not actively connected but can quickly reconnect when needed.
RRC’s Role in LTE Mobility
When you move around, RRC handles the mobility process by ensuring smooth handovers between cells, maintaining the connection without interruptions, and deciding whether to switch to a new cell or stay connected to the current one.