Frequency domain resource allocation in wireless networks

An apparatus comprising:

• at least one processor;
• and
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus at least to:
• receive, by a user device from a network node, a configuration including at least an indication to perform spectrum extension;
• determine, by the user device, a target extension factor for excess band frequency resources for a target spectrum extension;
• receive, by the user device from the network node, information indicating a set of inband frequency resources allocated to the user device for uplink transmission;
• determine, by the user device based on the set of inband frequency resources and the target extension factor, the excess band frequency resources for the spectrum extension and a total allocation of frequency resources for uplink transmission, wherein the total allocation of frequency resources includes the inband frequency resources and the excess band frequency resources;
• perform, by the user device, a spectrum extension based on the excess band frequency resources for a set of frequency domain values, to obtain a spectrum extended signal;
• determine, by the user device, that the excess band frequency resources include an odd number of resource blocks or one or more orphan resource elements that are part of a fractional resource block;
• shift, by the user device, the total allocation including the inband frequency resources and the first half and the second half of the excess band frequency resources, by one half of a resource block in the frequency domain so that the resource blocks of the total allocation are resource block aligned with a grid of resource blocks;
• and
• transmit the spectrum extended signal.