4G LTE UL CHANNEL

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4G LTE UL CHANNEL

Postby beginner » 23 Feb 2016, 11:02

PRACH (PHYSICAL RANDOM ACCESS CHANNEL
•Carries the random access preamble a UE sends to access the network
•It consists of 72 sub-carriers in the frequency domain
•There are 4 different RA(random access) preamble formats defined in LTE FDD specifications

PUCCH (Physical Uplink Control Channel)
•This LTE channel is used to carry UCI(Uplink Control Information)
•This PUCCH control signaling channel comprises following:
•HARQ ACK/NACK
•CQI-channel quality indicators
•MIMO feedback -RI(Rank Indicator),PMI(Precoding Matrix Indicator)
•scheduling requests for uplink transmission
•BPSK or QPSK used for PUCCH modulation

PUSCH (Physical Uplink Share Channel)
•LTE PUSCH channel contain user information data.
•The PUSCH carries both user data as well as control signal data. Control information carried can be MIMO related parameters and transport format indicators.
•The control data information is multiplexed with the user information before DFT spreading module in the uplink SC-FDMA physical layer.
•PUSCH supports QPSK,16QAM and 64QAM(optional). The LTE eNodeBselects suitable modulation based on adaptation algorithm



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