Rank Indication

Latest reply: Feb 10, 2020 05:20:57 82 2 0 0

Anyone can explain what is rank indication in LTE?

Thanks in advance!

  • x
  • convention:

MVE Created Feb 10, 2020 05:20:57 Helpful(1) Helpful(1)


The rank indication or the RI in LTE is one of the control information that a UE will report to eNodeB on either PUCCH or PUSCH based on uplink scheduling.

The eNodeB configures the RI reporting periodicity for every UE during the attach procedure and UE has to honour it. The RI reporting periodicity can overlap with CQI reporting periodicity in which case the UE will drop CQI and report RI.

Now coming to the RI itself, the contents of RI is just a couple of bits. The number depends on antenna configuration. If the eNodeB is configured with 2 transmit antennas on downlink then the number of bits reported in RI will be one and if its 4 then number of RI bits will be 2.

Lets consider the two antenna case where RI is indicated using one bit, so a bit 0 indicates RANK1 and a bit 1 indicates RANK2. RANK1 means the UE is seeing a good SINR only on one of its receive antenna so asking the eNodeB to bring down the transmission mode to single antenna or transmit diversity. A RANK2 from the UE means good SINR on both the antenna ports and eNodeB can schedule MIMO.
  • x
  • convention:

Unicef Created Feb 10, 2020 06:36:26
@umaryaqub thx q  


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