Fast random switching in method used for upward special channel enhancement of WCDMA system

The quick random access method for upward special-purpose channel enhancement in wideband code division multiple address system includes the following steps: cyctically setting initial leading transmission power excursion quantity and power boosting step size for upward special-purpose channel enhancement by network terminal; according to the received initial leading transmission power excursion quantity and said power boosting step size respectively calculating initial leading transmission power for random access and leading transmission power of every time by mobile terminal. Said invention utilizes the above-mentioned power excursion quantity and larger power boosting step size to increase initial transmission power of random access process, increase probability of success of random access process, reduce time for making power detection and further reduce the time for random access. 一种用于宽带码分多址系统上行专用信道增强的快速随机接入方法，包括步骤：网络端周期性地设定初始前导传输功率偏移量和上行专用信道增强的功率攀升步长，并通过系统信息广播给移动终端；移动终端根据收到的初始前导传输功率偏移量和该功率攀升步长分别计算随机接入的初始前导传输功率和每次的前导传输功率。本发明通过为上行专用信道增强用户专门设置初始前导传输功率的偏移量和较大的功率攀升步长，增大随机接入过程初始传输功率，增大随机接入过程成功的概率。减小功率探测的时间，进而减小随机接入的时间。在本发明中，新增加的信息元的值由网络端根据当前的上行干扰以及可能的快速随机接入用户数的估计而设定，网络端可控。