Message transmission through a random access scheme

A user equipment (UE) device for transmitting a data message using a random access procedure in a wireless communication system, wherein the UE device is adapted to:

• transmit a random access request and the data message, the random access request and the data message having a respective duration with a different time unit and the time unit of the random access request being shorter than the time unit of the data message;
• and
• transmit the data message through a data frame structure upon assignment of a resource, wherein a time misalignment (Δt) occurs between two data frames located in adjacent frequency sub-bands, the two data frames being separately and respectively transmitted from the UE device and another UE device, wherein an adaptive frequency guard band is inserted between the resource and an adjacent resource assigned to the other UE device, the frequency guard band
• having an adaptive size (w) based on a level of the time misalignment (Δt) between two data frames located in adjacent frequency sub-bands, on a decay power of a pulse shape used for the data transmission and on a desired power suppression level (Pi1, Pi2) to be attained by the respective pulse shape used for the transmission of each one of the two data frames.

A base station (BS), the BS being adapted to:

• exchange information with at least one user equipment (UE) device for transmitting a data message using a random access procedure in a wireless communication system, wherein the UE device is adapted to transmit a random access request and the data message, the random access request and the data message having a respective duration with a different time unit and the time unit of the random access request being shorter than the time unit of the data message;
• receive the data message from the at least one UE device;
• determine a size (w) of a frequency guard band based on a time misalignment (Δt), a desired power suppression levels (Pi1, Pi2) to be attained by respective pulse shapes used for transmission of the two data frames located in adjacent frequency sub-bands and the respective pulse shapes used for the transmission of the respective two data frames;
• and
• inform the UE device about the determined size (w) of the frequency guard band.

A method for transmitting a data message using a random access procedure in a wireless communication system, the method comprising:

• transmitting a random access message;
• transmitting the data message,
• wherein:
• the random access message and the data message have a respective duration with a different time unit;
• and
• the time unit of the random access message is shorter than the time unit of the data message;
• and
• transmitting a compressed signature through the transmission of the random access request, the compressed signature being formed by multiplying a compressive sensing matrix (A) and a binary sequence corresponding to a unique identity (ID) of the UE device, the compressed signature being of a smaller length than a length of the binary sequence.

A method of determining a size (w) of a frequency guard band in a wireless transmission system, the method comprising:

• checking whether a size of a time misalignment (Δt) between a first data frame located in a first frequency sub-band and a second data frame located in a second frequency sub-band adjacent to the first frequency sub-band is larger than a size of a cyclic prefix (CP);
• and
• applying, when the size of the time misalignment (Δt) is larger than the size of the cyclic prefix (CP), the following steps:
• determining a first size (wG1) of the frequency guard band based on a power spectral density (PSD-1) of a first pulse shape used for a transmission of the first data frame located in the first frequency sub-band;
• determining a second size (wG2) of the frequency guard band based on a power spectral density (PSD-2) of a second pulse shape used for a transmission of the second data frame located in the second frequency sub-band adjacent to the first frequency sub-band;
• and
• selecting as the size (w) of the frequency guard band the highest value amongst the first and second sizes (wG1, wG2).