Methods and devices for MIMO transmission
AssigneeTelefonaktiebolaget LM Ericsson (publ)
InventorsZhang Zhang, Bo Göransson, Xinyu Gu, Erik Larsson, Qingyu Miao
Life of this patent
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Abstract
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.
Claims11
A method of controlling impact from high-rank 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, the method comprising:
- determining, by a radio base station in the cellular radio system, an estimated Channel Quality Indicator (CQI) delay;
- based on the estimated CQI delay, determining, by the radio base station, if there exists a CQI under-estimation or a CQI over-estimation;
- and
- controlling, by the radio base station, the impact from the high-rank interference from transmission to the 4-branch MIMO enabled UE, based on the determined CQI under-estimation or the determined CQI over-estimation, by controlling a scheduling priority pattern, wherein a length of the scheduling priority pattern equals the estimated CQI delay, and further wherein controlling the scheduling priority pattern comprises prioritizing each Transmission Time Interval (TTI) as either a 4-branch MIMO enabled UE prioritized TTI or a legacy non-4-branch MIMO UE prioritized TTI, and dynamically adapting a ratio of the 4-branch MIMO enabled UE prioritized TTIs and the legacy non-4-branch MIMO UE prioritized TTIs based on traffic load from the 4-branch MIMO enabled UE and a legacy non-4-branch MIMO UE.
A radio base station adapted to control impact from high-rank 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, the radio base station comprising:
- a controller that:
- determines an estimated Channel Quality Indicator (CQI) delay;
- determines if there exists a CQI under-estimation or a CQI over-estimation, based on the estimated CQI delay;
- and
- controls the impact from the high-rank interference from transmission to the 4-branch MIMO enabled UE, based on the determined CQI under-estimation or the determined CQI over-estimation, by controlling a scheduling priority pattern, wherein a length of the scheduling priority pattern equals the estimated CQI delay, and further wherein controlling the scheduling priority pattern comprises prioritizing each Transmission Time Interval (TTI) as either a 4-branch MIMO enabled UE prioritized TTI or a legacy non-4-branch MIMO UE prioritized TTI, and dynamically adapting a ratio of the 4-branch MIMO enabled UE prioritized TTIs and the legacy non-4-branch MIMO UE prioritized TTIs based on traffic load from the 4-branch MIMO enabled UE and a legacy non-4-branch MIMO UE.
Dependencies are inferred from the claim text.