PRACH Preamble Extended Cyclic Prefix Design

The patent applies parameter changes by introducing extended cyclic prefix lengths (e.g., 1680, 2016, 2400 resource elements) and new sequence lengths (1583, 2011, 2087) to adapt PRACH preambles for higher frequency ranges and wideband carriers. This modifies the temporal and spectral parameters of the preamble to maintain orthogonality and reduce interference in challenging propagation conditions.

The patent segments the PRACH preamble structure into distinct components including extended cyclic prefix portions, sequence portions, and guard periods. This segmentation allows independent optimization of each component - the extended CP is separated from the sequence portion to enable flexible configuration based on frequency range requirements without redesigning the entire preamble.

The patent creates universal PRACH preamble formats that can function across multiple frequency bands and carrier types. The extended cyclic prefix formats are designed to work for both FR1 and FR2 frequency ranges, as well as for normal and wideband carriers, by adjusting parameters like sequence length and CP length while maintaining the same fundamental structure and processing methodology.

The patent introduces dynamic configurability through higher layer parameters that allow the network to select and configure appropriate preamble formats based on current operational requirements. The system can dynamically switch between different extended CP formats (e.g., format A1, A2, A3, B1, B2, B3, C0, C2) depending on the frequency range, carrier bandwidth, and propagation conditions.

The patent changes the cyclic prefix parameter from traditional lengths to extended lengths (1680, 2016, 2400 resource elements), which provides better protection against inter-symbol interference and multipath effects. This parameter change improves reliability by ensuring orthogonality between different preambles even in high-delay spread environments, while the patent manages bandwidth requirements through efficient sequence design.

The patent combines multiple components - extended cyclic prefix sequences, carefully selected logical root indices, and optimized sequence mappings - to create a composite preamble structure. This composite approach allows the extended CP to provide reliability benefits while the overall structure is optimized to fit within available channel bandwidth by leveraging the properties of different sequence lengths and their spectral characteristics.