Narrowband New Radio CORESET Arrangement for Full CCE Alignment
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Solution Overview
Problem
Existing 5G NR systems face challenges in efficiently operating in narrow bandwidths, such as 3-5 MHz, due to synchronization signal and PBCH block transmission issues that lead to partial CCEs and degraded PDCCH performance.
Innovation Solution
A method to determine the control resource set (CORESET) frequency location by aligning it with a punctured synchronization signal block, using a pre-defined sync raster point and RF channel, and adjusting the RB offset based on PBCH parameters to avoid partial CCEs, thereby improving PDCCH reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If synchronization signal block is transmitted in narrow bandwidth, then coverage is improved, but partial CCEs occur leading to degraded PDCCH performance
Solution Approach 1:
The patent applies preliminary action by pre-defining the sync raster point and determining the RB offset before PDCCH transmission. The CORESET frequency location is calculated in advance using the formula: CORESET frequency location = sync raster point + RB offset, where the RB offset is derived from RF channel and PBCH parameters. This preliminary positioning ensures that PDCCH resources are properly aligned with synchronization signals, preventing partial CCE formation and maintaining reliable PDCCH performance in narrow bandwidth scenarios.
2Device complexity
If RB offset is not adjusted based on PBCH parameters, then system complexity is reduced, but PDCCH reception performance deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the RB offset based on PBCH parameters (specifically the subcarrier offset k_SSB). The system modifies the RB offset value according to the detected k_SSB parameter from the PBCH, ensuring that the CORESET frequency location remains properly aligned with the synchronization signal block. This parameter adaptation maintains optimal PDCCH reception performance without requiring complex additional signaling, as it leverages existing PBCH parameters already transmitted in the system.
Data Source
AI summary
Various techniques are provided for a method including triggering, by a user equipment (UE), a resource block (RB) offset allocation determination, detecting, by the UE, at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a received synchronization signal (SS) block (SSB), reading, by the UE, a physical broadcast channel (PBCH) parameter and a signaled offset from a master information block of a PBCH of the SSB, determining, by the UE, an RB offset based on the PBCH parameter and the signaled offset, and determining, by the UE, a control resource set frequency location based on the RB offset.