1. Introduction to RF Optimization (Pre-Optimization)

1. Introduction to RF Optimization (Pre-Optimization)

During RF (pre)optimization stage, the Optimization/Planning/Drive-Test responsibles, optimize the radio frequency (RF) access part of the 3G network.

This aims to control pilot pollution and SHO Factor based on DT in optimizing signal coverage, so that the distribution of radio signals is normal in next service parameters optimization stage (or Network QoS optimization phase).

1.1 Contents of RF Optimization

RF optimization includes the following aspects:

A. Pilot signal coverage optimization

This includes the following two parts:

· Weak coverage optimization for ensuring seamless coverage by pilot signals in the network

· Primary pilot cell optimization for ensuring proper coverage areas by each primary pilot cell, clear edge of primary pilot cells, and that alternation of primary pilot cells is reduced as much as possible.

B. Pilot pollution optimization

Pilot pollution refers to that excessive pilots of approximately equivalent strength covering an area without a primary pilot. Pilot pollution might cause increasing of downlink interference, call drop due to frequent handover, low network capacity. The problems must be solved by adjusting engineering parameters.

C. Handover optimization

It consists of two parts:

· Checking missing neighbor cells, verifying and improving the list of neighbor cells, solving handover, call drop, and downlink interference problems.

· Ensuring proper SHO Factor based on DT by adjusting engineering parameters properly.