DC Subcarrier Reporting Across BWP-CC Combinations

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Solution Overview

Problem

In wireless communication systems, the direct current (DC) subcarrier location can cause high interference and noise, affecting the performance of baseband receivers, especially at higher frequencies, due to varying RF receiver implementations among different UEs.

Innovation Solution

User equipment reports DC subcarrier location information for a subset of possible combinations of bandwidth parts and component carriers, allowing the network to determine optimal reference signal configurations and avoid interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If DC subcarrier location is reported for all possible combinations of bandwidth parts and component carriers, then complete interference avoidance is achieved, but signaling overhead and system complexity increase significantly

Engineering Contradiction:

Improveinterference avoidanceVSAvoidsignaling overhead

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the complete set of bandwidth part and component carrier combinations into multiple subsets. The UE reports DC subcarrier location information only for combinations within these subsets rather than all possible combinations. This segmentation reduces signaling overhead while maintaining interference avoidance effectiveness for the reported combinations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of reporting DC subcarrier location for all possible BWP-CC combinations (excessive action), the patent applies partial action by reporting only for a subset of combinations. This partial reporting reduces signaling overhead while still providing sufficient information for the network to avoid interference in the most critical scenarios.

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If DC subcarrier location is reported for all possible combinations of bandwidth parts and component carriers, then complete interference avoidance is achieved, but message size and processing time increase

Engineering Contradiction:

Improveinterference avoidanceVSAvoidprocessing time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent divides the comprehensive BWP-CC combination space into multiple subsets, requiring the UE to report DC subcarrier location information only for combinations within these subsets. This segmentation reduces the message size and processing time while maintaining interference avoidance capability for the segmented combinations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements partial reporting by selecting and reporting DC subcarrier location information only for a subset of BWP-CC combinations rather than all possible combinations. This partial action reduces the time required for message transmission and processing while still achieving interference avoidance for the most critical combinations.

Inventive Principle:

Principle #16Partial or excessive action

Data Source

PatentEP4205343B1DC subcarrier location indication for a combination of bandwidth parts and component carriers

Publication Date: 2026.02.25 QUALCOMM INC

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AI summary

A user equipment UE can report direct current DC subcarrier location information for a subset of possible combinations of bandwidth parts BWPs and component carriers CCs configured for the UE by a base station gNB. In one aspect, the UE receives, from the base station gNB, a message for activating a first combination of bandwidth parts BWPs and component carriers CCs in a list including the subset of combinations of BWPs and CCs configured for the UE (1202). The UE determines and reports DC subcarrier location information for the first combination of BWPs and CCs to the base station gNB (1204).