然后我就发现我理解错downlink only的意思了。。。我在ETSI TS 138 101-1 V15.2.0 (2018-07)里找到了如下描述
The UE channel bandwidth can be asymmetric in downlink and uplink. In asymmetric channel bandwidth operation, thenarrower carrier shall be confined within the frequency range of the wider channel bandwidth.