Multi-TRP Uplink Timing Advance and CSI Codebook

The patent segments the timing advance management by introducing separate TA values for different TRPs (TA0 for first TRP, TA1 for second TRP). This segmentation allows independent timing control for each TRP-UE link, resolving the synchronization complexity that arises from multi-TRP operation while maintaining transmission reliability through diversified timing paths.

The patent extends the traditional single-dimension timing advance concept into multiple dimensions by introducing TRP-specific timing advance values. Instead of a single TA value for all TRPs, the system now operates in a multi-dimensional timing space where each TRP has its own TA parameter, enabling precise timing control across multiple transmission points without overwhelming complexity.

The patent extends the codebook structure from the traditional two-dimensional space (spatial and frequency dimensions) to a three-dimensional space by adding the time dimension. This dimensional extension allows the codebook to capture temporal variations in channel state information, significantly improving measurement precision for mobile scenarios while managing complexity through structured W(d, f, t) = Wd(d) ⊗ Wf(f) ⊗ Wt(t) decomposition.

The patent creates a composite codebook structure by combining three distinct basis functions (spatial DFT, frequency DFT, and time DFT) into a unified three-dimensional codebook. This composite approach allows each dimension to be optimized independently while achieving superior overall performance in capturing channel characteristics across space, frequency, and time domains.