Methods and devices of controlling impact from interference from transmission to a 4-branch Multiple Input Multiple Output, MIMO, enabled User Equipment, UE, in a cellular radio system where legacy non 4-branch MIMO UEs co-exist are provided. The control involves determining an estimated Channel Quality Indicator, CQI, delay, and based on the estimated CQI delay determining if there exists a CQI under-estimation or CQI over-estimation. The control of the impact from high rank interference from transmission to the 4-branch MIMO enabled UE is based on a determined CQI under-estimation or CQI over-estimation.
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