HSDPA系统中HS-SCCH的功率控制算法

Power Control Algorithms of HS-SCCH for HSDPA System

为提高高速下行链路分组接入（HSDPA）系统功率的利用率，降低干扰，提出了HS—SCCH控制信道的两种功率控制算法：基于下行DPCCH导频域的功率偏移和基于CQI的功率控制。仿真表明，当信道条件好、时延小的时候，第一种算法优于第二种算法大约1—2dB；当信道条件差、时延大的时候，第二种算法优于第一种算法大约2—5dB。两种算法结合使用时，能达到更好的效果。

In order to improve the power efficiency and decrease the interference of the HSDPA system, two algorithms are proposed ： the algorithm based on the power offset of the downlink DPCCH pilot field and the algorithm based on CQI value. The simulation results show that when the channel environment is good and the time delay is small, the former algorithm is better than the latter by 1 to 2dB, but when the channel environment is bad and the time delay is large, then the latter is better than the former by 2 to 5dB. An even better effect can be obtained if the two algorithms are applied together.