Key LTE technologies for wireless communication network learning ICIC (20141220), lteicic

Key LTE technologies for wireless communication network learning ICIC (20141220), lteicic

ICIC: Inter Cell Interference Coordination, Inter-Cell Interference Coordination technology.

Cell interference is a key indicator that limits cell network cell throughput, especially for cell edge users. Because the Frequency Multiplexing factor supported by the LTE system is 1, meticulous management of inter-cell interference is particularly important.

The ICIC design principle is to increase the throughput of edge users at the cost of not reducing or slightly reducing the total throughput of the residential area.

There are two ways to increase the throughput of edge users: one is to increase the number of edge users RB, and the other is to increase the signal-to-noise ratio (SINR) of edge users ),

Note: The RB number is the wireless link bearer (Radio Bear)

Increasing the number of RB for edge users reduces the number of RB for central users and reduces the total throughput of the residential area. The Method to Improve the SINR of edge users is that edge users in the residential area and users in neighboring areas use RB resources with the same seats to reduce the transmit power (when the load is high) of the RB resources in the neighboring areas ), or do not transmit (when the load is low) to reduce neighboring area interference, but reduce interference with neighboring area center RB resource transmission power, it is easy to cause interference with neighboring area center user SINR, to reduce the center user and total throughput, unless the adjacent center user's transmit power is surplus, that is, its SINR has exceeded the demodulation threshold required by the maximum MCS format.

In summary, when the system load is low, ICIC can improve the throughput of users at the edge of the residential area without sacrificing the total throughput of the residential area. When the system load is high, unless the SINR of the residential center user has exceeded the demodulation threshold required by the maximum MCS format, the total throughput of the residential area will inevitably decrease. At this time, ICIC is more important to load balancing.

Based on the baseband processing method, it can be divided into distributed ICIC and centralized ICIC;

Static ICIC and dynamic ICIC can be divided into FFR and SFR according to the interaction frequency of cell information.

FFR (Fractional Frequency Reuse): Partially multiplexing;

SFR (Soft Frequency Reuse): Soft Frequency Reuse;

The Frequency Multiplexing factor is 1 (same-Frequency Multiplexing)

Conclusion: we would rather sacrifice a certain amount of bandwidth to avoid the same-frequency Edge interference. It is called ICIC (Inter-CellInterference Coordination, Inter-cell interference Coordination ).

Here is a brief introduction to ICIC. You are welcome to learn about the SON technology next time.