Cell-Specific RA-RNTI Calculation for Reliable Random Access Response
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Solution Overview
Problem
In next-generation mobile communication systems, there is a collision issue with Random Access Radio Network Temporary Identifiers (RA-RNTIs) for different random access procedures, leading to improper reception of random access responses, especially during handover operations involving serving and candidate cells.
Innovation Solution
A method and device for calculating RA-RNTIs based on cell-specific information, such as Physical Cell Identity (PCI) and cell indices, to distinguish RNTIs for serving and candidate cells, ensuring clear identification of random access responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single RA-RNTI calculation method is used for both serving cell and candidate cell random access procedures, then the calculation process is simple, but RA-RNTI collisions occur between different cells
Solution Approach 1:
The patent applies local quality by making the RA-RNTI calculation cell-specific. Different cells (serving cell and candidate cells) use their own unique parameters (such as cell ID, SSB index, or RACH occasion index) in the RA-RNTI calculation formula. This ensures that each cell generates distinct RA-RNTI values for its random access procedures, preventing collisions while maintaining a unified calculation approach across the network.
2Reliability
If cell-specific parameters are incorporated into RA-RNTI calculation, then RA-RNTI collision is prevented, but the calculation complexity increases
Solution Approach 1:
The patent implements parameter changes by modifying the RA-RNTI calculation formula to include cell-specific parameters. Instead of using a universal calculation method, the formula is adapted to incorporate variables such as physical cell identity (PCI), SSB index, or RACH occasion index that are unique to each cell. This parameter differentiation ensures reliable distinction between cells while keeping the calculation process systematic and manageable.
Data Source
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AI summary
A method according to an embodiment of the present disclosure comprises the steps of: receiving a DCI; transmitting a PRACH; receiving a PDCCH associated with a RAR; and receiving a PDSCH associated with the RAR. The PRACH is associated with a second cell that is different from the first cell. A CRC of the DCI associated with the PDCCH is scrambled on the basis of an RNTI. The RNTI is characterized by a random access (RA)-RNTI calculated on the basis of information associated with the second cell.