Physical Location of Downlink Predictors Sample Clauses

Physical Location of Downlink Predictors. In UEs or on the Network Side? Predictors for downlink channels can either be located in the UEs or in the fixed network.  If the predictors for the downlinks are located at UE´s, then their predictions are transmitted on an uplink control channel to the strongest eNB of each UE, denoted the Master eNB. This feedback is performed on the short term fading time scale and needs to have low latency. The prediction error statistics must also be reported, but this can be performed on a much slower time-scale, related to that of the shadow fading.  If predictors are located at the network side, then each UE sends (compressed) measurement reports over an uplink control channel, that are used for the prediction. The choice between these alternatives is influenced by the reporting overhead they incur, by complexity and by other considerations. The required uplink feedback overhead per UE seems for these two alternatives to be rather similar. Both predictions and measurement reports would need to be sampled and updated equally densely. A frequency- and temporal resolution equal to that of the reference signals would typically be used in both cases. As a rough estimate, this would, as discussed in Subsection 5.3.3 below, with the above suggested reference signal pattern, generate complex numbers at up to 36 reference signal locations per resource block for LTE Rel 10 CSI reference signals, to be reported every 5 ms. We here exemplify by assuming that on average complex numbers for the 5 strongest received channels are reported. Insignificant quantization losses would require 10 bits per reported complex coefficient, corresponding to a quantization error floor at -30 dB.23 The corresponding maximal reporting overhead would then be 5 x 10 bits x 200 reports/s = 10 kbits/s = 10 bits/ms per physical resource block bandwidth per reporting UE, in both of the considered alternatives. The quantization granularity could be reduced. Furthermore, feedback information can be compressed by lossy compression before being transmitted over the uplink, see e.g. Appendix A4-4 and A4-5 below and [EO07]. When the total uplink feedback load is considered, placement of the predictors at the UEs becomes clearly more attractive than placement on the network side. As outlined in Section A2.2.8 of Xxxxxxxx X0-0, and further discussed in Subsection 5.3.3 below, placement of the predictors in UEs makes it possible to use a scheme that can drastically reduce the required feedback rate. It was s...
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