B-IFDMA configuration for unlicensed band operation

An apparatus, comprising:

• at least one processor;
• and
• at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to:
• configure a first interlace having multiple clusters of equally spaced physical resource blocks;
• configure a second interlace having multiple clusters of equally spaced physical resource blocks, wherein the first interlace and second interlace have a cluster spacing in terms of physical resource blocks between clusters of the first and second interlaces in a plurality of physical resource blocks forming a channel bandwidth;
• transmit a signal based on both of the first interlace and the second interlace, wherein both the first and second interlaces together have at least one cluster but less than two clusters in each measurement interval over which power of the signal is to be measured;
• controlling a power spectral density of the signal to avoid exceeding a predetermined limit in any measurement interval;
• determining a measurement interval contains more than one cluster;
• and
• applying special handling associated with the transmission of the signal for predefined clusters corresponding to the determined measurement interval.

A computer program product comprising a non-transitory computer-readable storage medium bearing computer program code embodied therein for use with a computer, the computer program code comprising code for causing the computer to perform operations comprising:

• configuring a first interlace having multiple clusters of equally spaced physical resource blocks;
• configuring a second interlace having multiple clusters of equally spaced physical resource blocks, wherein the first interlace and second interlace have a cluster spacing in terms of physical resource blocks between clusters of the first and second interlaces in a plurality of physical resource blocks forming a channel bandwidth;
• transmitting a signal based on both of the first interlace and the second interlace, wherein both the first and second interlaces together have at least one cluster but less than two clusters in each measurement interval over which power of the signal is to be measured;
• controlling a power spectral density of the signal to avoid exceeding a predetermined limit in any measurement interval;
• determining a measurement interval contains more than one cluster;
• and
• applying special handling associated with the transmitting for predefined clusters corresponding to the determined measurement interval.