Inter-cell interference coordination (ICIC) in LTE
To aid downlink ICIC
- Relative narrowband transmission-power indicator
- A cell can provide this information to neighboring cells, indicating the part of the bandwidth where it intends to limit the transmission power. A cell receiving the indication can schedule its downlink transmissions within this band, reducing the output power or completely freeing the resources on complementary parts of the spectrum
To aid uplink ICIC
- High interference indicator
- The high-interference indicator provides information to neighboring cells about the part of the cell bandwidth upon which the cell intends to schedule its cell-edge users. Because cell-edge users are susceptible to inter-cell interference, upon receiving the high-interference indicator, a cell might want to avoid scheduling certain subsets of its own users on this part of the bandwidth.
- Overload indicator
- The overload indicator provides information on the uplink interference level experienced in each part of the cell bandwidth. A cell receiving the overload indicator may reduce the interference generated on some of these resource blocks by adjusting its scheduling strategy.