A method of wireless communication, comprising: receiving, by a user equipment, UE, from a base station of a first network, system information associated with the first network, wherein the system information is received in a second frequency band, wherein the system information includes channel configuration information and random access channel configuration information, the channel configuration information indicating a first frequency band and the second frequency band, the first frequency band being at a lower frequency than the second frequency band, the first lower frequency band used by the first network for uplink-only communications and also used for frequency-division duplexing, FDD uplink communications of a radio access technology different from a radio access technology of the first network, the second higher frequency band designated to the first network for time-division duplexing, TDD, communications, and the random access channel configuration information comprising information for random access request transmissions; transmitting, by the UE in the first lower frequency band, a random access request to the first network according to the received random access channel configuration; and receiving, by the UE in response to the random access request, a random access response from the base station of the first network, the response being received in the second higher frequency band. receiving, by a user equipment, UE, from a base station of a first network, system information associated with the first network, wherein the system information is received in a second frequency band, wherein the system information includes channel configuration information and random access channel configuration information, the channel configuration information indicating a first frequency band and the second frequency band, the first frequency band being at a lower frequency than the second frequency band, the first lower frequency band used by the first network for uplink-only communications and also used for frequency-division duplexing, FDD uplink communications of a radio access technology different from a radio access technology of the first network, the second higher frequency band designated to the first network for time-division duplexing, TDD, communications, and the random access channel configuration information comprising information for random access request transmissions; the first lower frequency band used by the first network for uplink-only communications and also used for frequency-division duplexing, FDD uplink communications of a radio access technology different from a radio access technology of the first network, the second higher frequency band designated to the first network for time-division duplexing, TDD, communications, and the random access channel configuration information comprising information for random access request transmissions; transmitting, by the UE in the first lower frequency band, a random access request to the first network according to the received random access channel configuration; and receiving, by the UE in response to the random access request, a random access response from the base station of the first network, the response being received in the second higher frequency band.