This application provides a communication method and apparatus, to expect to better implement spatial multiplexing of an access link and a backhaul link of an IAB node. The method is applied to an MT of the IAB node. The method includes: obtaining transmission resource configurations, where the transmission resource configurations include a first configuration and a second configuration, the first configuration indicates that a start time domain resource is a downlink time domain resource and/or an end time domain resource is an uplink time domain resource in one configuration period, and the second configuration indicates that a start time domain resource is an uplink time domain resource and/or an end time domain resource is a downlink time domain resource in one configuration period; and determining, according to a specified rule, one or more of the following: whether to perform uplink sending on an uplink time domain resource in the transmission resource configurations, whether to perform downlink receiving on a downlink time domain resource in the transmission resource configurations, whether to send an uplink signal on a time domain resource in a reference configuration, or whether to receive a downlink signal on a time domain resource in the reference configuration, where the reference configuration is at least one of the first configuration and the second configuration.