Methods may be providing for signal synchronization at a wireless terminal communicating with a radio access network. For example, a command may be received from the radio access network, and the command may be to add a first carrier on a first frequency as a link for communications from the radio access network to the wireless terminal. Responsive to receiving the command to add the first carrier, the first carrier may be synchronized and/or configured using signals of a second carrier on a second frequency different than the first frequency. Related wireless terminals, network nodes, and network node methods are also discussed.