Dear community friends, today I would like to share some information about ICIC (Inter-cell Interference Coordination).
Before I introduce ICIC, I want to introduce cell interference to you.
What is Cell interference?
In an LTE system, cells in the system use the same frequency for sending and receiving. Unlike the CDMA system, the LTE system cannot reduce the impact of signals of neighboring cells by combining signals of different cells. Therefore, interference is generated between cells, and cell interference is severe.
How are we going to do cell interference control?
There are four methods to control cell interference.
1. Interference randomization: a passive interference control method. The purpose is to balance the interference received by the system in the time domain and frequency domain as much as possible. Interference control can be implemented by means of scrambling, interleaving, and frequency hopping.
2. Interference cancellation: The UE demodulates information about neighboring cells, cancels out information about neighboring cells, and then demodulates information about the local cell. The interleaved multiple access IDMA may also be used to perform joint demodulation of multi-cell information.
3. Interference suppression: The UE and multiple antennas estimate and suppress colored interference in the space, Interference suppression can be performed in a spatial dimension and a frequency dimension. The system is complex and can be implemented by combining uplink and downlink interference suppression IRC.
4. Interference coordination: Active interference control technology. Controls the time domain and frequency resources available at the cell edge. This is a widely used cell interference suppression method.
Next, I'm going to introduce cell interference coordination.
What is cell interference coordination?
Cell interference coordination is a technology used to resolve cell interference caused by intra-frequency LTE networking.
The main principle of ICIC is as follows: The reuse factor of the cell center area is 1 and the reuse factor of the cell edge is 3.
Cell interference coordination is a method for controlling cell interference. It is essentially a scheduling strategy.
Figure 1 Cell Interference Coordination
What are the characteristics of cell interference coordination?
Figure 2 Characteristics of cell interference coordination
What has interference coordination changed for us?
ICIC eliminates co-channel interference and improves user experience at the cell edge, especially in densely populated urban areas. The emergence of ICIC promotes the development of LTE and provides a basis for the emergence of MIMO technologies.
That's my share, and you're welcome to comment.
