Icic of LTE key technology of wireless communication Network Learning (20141220)

ICIC:Inter Cell interference coordination, inter-cell interference coordination technology.

For cellular network cell throughput is the key limit of the target is the cell disturbance, especially the cell edge users. Because the LTE system supports a frequency multiplexing factor of 1, the meticulous management of inter-cell interference is particularly important.

The Icic design guideline is to increase the throughput of edge users without decreasing or slightly reducing the total throughput of the cell.

Improve edge User throughput Two methods: one is to increase the edge user RB number, one is to improve the edge user signal to Noise ratio (SINR),

Note: RB number is Wireless Link bearer (Radio Bear)

By increasing the number of RB in the edge user, the RB number of the central user is reduced, and the total throughput of the cell decreases. The means to improve the edge users ' SINR is that the marginal users in this area can reduce the interference of adjacent area by reducing the transmitting power (when the load is higher) of the central RB resource of the neighboring area and the use of the same seat in the center of the neighbor, but reducing the transmitting power of the central RB resource of the adjacent area. , it is easy to cause interference with the sinr of the Neighbor Center user, thereby reducing the central user and the total throughput, unless the Neighbor Center user transmit power has surplus, that is, its sinr has exceeded the maximum MCS format required demodulation threshold.

On the whole, when the system load is low,ICIC can increase the throughput of the edge users without sacrificing the total cell throughput, and when the system load is high, unless the SINR of the Community center user has exceeded the demodulation threshold required by the maximum MCS format, Otherwise, it will inevitably result in a decrease in the total throughput of the cell, when the ICIC is more of a load balancing function.

According to the baseband processing method, it can be divided into distributed Icic and centralized Icic.

According to the frequency of cell information interaction, it can be divided into static Icic and dynamic Icic, and static icic can be divided into FFR and SFR according to the reuse degree of Edge band.

FFR (fractional Frequency reuse): Partial frequency multiplexing;

SFR (Soft Frequency reuse): soft frequency multiplexing;

Frequency multiplexing factor of 1 (same frequency multiplexing)

Summary: Would rather sacrifice a certain bandwidth to avoid the edge of the same frequency interference technology, called ICIC (inter-cellinterference coordination, inter-cell interference coordination).

I CIC is a little introduced here, you are welcome to correct, next time we know son technology.

Icic of LTE key technologies for wireless communication Network Learning (20141220)