Timeline for PRACH Probes

//Timeline for PRACH Probes

Timeline for PRACH Probes 

Timeline for PRACH Probes - I

Timeline for PRACH Probes 

When the eNB sends a Back-off Indicator (BI) in the RAR sub-header, it is directing the UE to back off the next preamble transmission.

Based on this BI value (x milliseconds), the UE will generate a random back-off value, say y, in the range of 0 to x milliseconds.

The UE may transmit the next preamble, at the next valid subframe as defined by the eNB PRACH Configuration Index, after t+3+w+y.

This back-off process randomizes retransmissions resulting in reduced chances of collision of preambles.

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