RATE_12M_IDX_TBL
ch_info->power_info[RATE_12M_IDX_TBL].requested_power +
ch_info->power_info[RATE_12M_IDX_TBL].
pwr_info = &ch_info->power_info[RATE_12M_IDX_TBL];
table[RATE_12M_IDX_TBL].next_rate_idx = RATE_9M_IDX_TBL;