Carrier configuring and signalling scheduling in co-existing radio access systems

A method for signal scheduling, comprising:

• scheduling, in a first radio access system having a first carrier with a first carrier frequency band and a second carrier with a second carrier frequency band, uplink signals in said second carrier;
• wherein said second carrier is configured for frequency division duplex signaling;
• wherein a useful frequency band of said second carrier is defined to, at least partially, overlap in frequency with a useful frequency band of a third carrier having a third carrier frequency band of a second radio access system;
• wherein said third carrier has an overlapping coverage area with said second carrier;
• and
• wherein said uplink signals scheduled to said second carrier are scheduled to physical resource blocks of frequencies of said useful frequency band of said second carrier overlapping in frequency with guard bands of said third carrier,
• wherein a center frequency of said useful frequency band of said second carrier is offset with respect to a center frequency of said useful frequency band of said third carrier, and
• wherein said offset is equal to a width of said guard bands of said third carrier.

A network node comprising a memory and a processor configured to operate in one or more radio access systems, a wherein said network node is configured to:

• configure a first carrier having a first carrier frequency band and a second carrier having a second carrier frequency band for use for radio access in a first radio access system;
• wherein said second carrier is configured for frequency division duplex signaling;
• wherein a useful frequency band of said second carrier is defined to, at least partially, overlap in frequency with a useful frequency band of a third carrier having a third carrier frequency band of a second radio access system;
• wherein said third carrier has an overlapping coverage area with said second carrier;
• and
• wherein at least a part of said useful frequency band of said second carrier overlaps in frequency with guard bands of said third carrier,
• wherein a center frequency of said useful frequency band of said second carrier is offset with respect to a center frequency of said useful frequency band of said third carrier, and
• wherein said offset is equal to a width of said guard bands of said third carrier.

A network node comprising a memory and a processor configured to perform signal scheduling, wherein said network node is configured to:

• schedule, for a first radio access system having a first carrier with a first carrier frequency band and a second carrier with a second carrier frequency band, uplink signals in said second carrier;
• wherein said second carrier is configured for frequency division duplex signaling;
• wherein a useful frequency band of said second carrier is defined to, at least partially, overlap in frequency with a useful frequency band of a third carrier having a third carrier frequency band of a second radio access system;
• wherein said third carrier has an overlapping coverage area with said second carrier;
• and
• wherein said uplink signals scheduled to said second carrier are scheduled to physical resource blocks of frequencies of said useful frequency band of said second carrier overlapping in frequency with guard bands of said third carrier,
• wherein a center frequency of said useful frequency band of said second carrier is offset with respect to a center frequency of said useful frequency band of said third carrier, and
• wherein said offset is equal to a width of said guard bands of said third carrier.