SIB1 PDSCH Frequency Mapping to Reduce eRedCap UE Complexity
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Solution Overview
Problem
eRedCap UEs face ambiguity in receiving PDSCH for SIB1 due to their limited bandwidth, leading to increased UE complexity through post-FFT RE buffering for the entire 20 MHz band.
Innovation Solution
Determine the frequency band for PDSCH based on DCI, CORESET configured by MIB, or SSB, allowing eRedCap UEs to receive PDSCH within a smaller bandwidth, reducing the need for post-FFT RE buffering across the entire 20 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If eRedCap UE performs post-FFT RE buffering for 20 MHz to receive SIB1, then SIB1 reception is ensured, but UE complexity increases
Solution Approach 1:
The patent extracts only the necessary portion of the 20 MHz bandwidth that the eRedCap UE needs to receive PDSCH for SIB1. Instead of buffering the entire 20 MHz, the UE determines a specific frequency band (e.g., 5 MHz) within the 20 MHz based on DCI, CORESET, or SSB information, and performs post-FFT RE buffering only for this extracted subset, thereby reducing complexity while ensuring reliable SIB1 reception.
Solution Approach 2:
The patent applies local quality by making the buffering operation localized to a specific frequency region rather than global. The eRedCap UE identifies a particular frequency band (local region) within the 20 MHz spectrum where the PDSCH is transmitted and performs buffering only in this local area, optimizing resource usage and reducing overall UE complexity.
2Device complexity
If eRedCap UE supports only 5 MHz bandwidth for PDSCH, then UE complexity is reduced, but frequency resource utilization is limited
Solution Approach 1:
The patent resolves this contradiction by introducing a temporal dimension to bandwidth adaptation. The eRedCap UE can operate with 5 MHz bandwidth for normal PDSCH reception, but can access up to 20 MHz bandwidth for specific broadcast PDSCH transmissions during initial connection. This time-based bandwidth switching allows the system to optimize between complexity and resource utilization dynamically.
Data Source
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AI summary
A method performed by a terminal according to an embodiment of the present disclosure comprises the steps of: receiving an MIB from a base station; receiving a PDCCH from the base station on the basis of the MIB; and receiving a PDSCH from the base station. The PDSCH is related to an SIB1. A frequency band related to the PDSCH is determined on the basis of i) DCI, ii) a control resource set (CORESET) configured on the basis of the MIB, or iii) a synchronization signal/physical broadcast channel block (SSB).