UE when it is switched on, it cannot directly establish a connection with eNB. It needs system information. This system information is divided into MIB and SIB. As said above, there are 2 Types System Information Block available in 4G LTE. They are: 1. MIB: Master …
MAC Layer Function: 1. Mapping between logical channels and transport channel. 2. Multiplexing of MAC SDU form one or more different logical channels onto the transport blocks. 3. Those Transport blocks will be delivered to the physical channel. 4. De-multiplexing for MAC PDUs from transport blocks …
LTE downlink channel mapping: LTE Up link channel Mapping LTE Uplink Information Flow: LTE Downlink channel Information Flow: MAC layer does multiplexing of multiple logical channel into single transport channel. So understanding of LTE channels is important. First, what are channels in LTE? …
HARQ stands for Hybrid Automatic Repeat Request (HARQ). This is a physical layer functionality in LTE. It is type of error detection and correction technique. It uses forward error correction. ARQ: Automatic Repeat Request. It means, if the sender doesn’t receive ACK from the receiver before …
LTE Physical Layer 2 radio frames are supported: 1. Type 1: FDD : Frequency Division Duplex 2. Type 2: TDD : Time Division Duplex For multiple access, LTE uses: For down link: OFDMA: Orthogonal Frequency Division Multiple Access For up link: SC-FDMA: Single Carrier Frequency Division …
T300: Start: Transmission of RRCConnectionRequest Stop: Reception of RRCConnectionSetup or RRCConnectionReject message, cell re-selection and upon abortion of connection establishment by upper layers Expiry: Reset MAC and Mac configuration. Inform upper layers about the failure T301: Start: Transmission of RRCConnectionReestabilshmentRequest Stop: Reception of RRCConnectionReestablishment or RRCConnectionReestablishmentReject …