Unified DCI Format for SPS and Non-SPS Blind Decode Reduction
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Solution Overview
Problem
In wireless communication systems, low-cost user equipment (UEs) face challenges in decoding downlink control information (DCI) due to the need for multiple blind decodes, which increases power consumption and processing time, especially in low-cost, power-constrained devices.
Innovation Solution
The method involves transmitting DCI for non-semi persistent scheduling (SPS) using two transmission schemes with the same size, where specific fields in the second DCI are not used to determine transmission parameters, reducing the number of blind decodes required by the UE.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DCI formats with different sizes are used for non-SPS and SPS transmission schemes, then transmission flexibility and adaptability are improved, but the number of blind decodes required by the UE increases, leading to higher power consumption and processing time
Solution Approach 1:
The patent merges the DCI format structures for non-SPS and SPS transmission schemes by aligning their field compositions and sizes. Specifically, both DCI formats use the same set of fields (frequency domain resource assignment, time domain resource assignment, frequency hopping flag, redundancy version, new data indicator, and HARQ process number) with identical bit lengths, allowing the UE to decode both formats using the same blind decode process, thereby reducing power consumption while maintaining transmission flexibility
Solution Approach 2:
The patent creates a universal DCI format structure that serves multiple functions - the same DCI format can be used for both non-SPS and SPS transmission schemes. This universality is achieved by making the DCI sizes identical and using the same field definitions, allowing the UE to handle different transmission schemes through a single standardized decoding approach rather than requiring separate specialized formats
2Adaptability or versatility
If multiple DCI formats with different sizes are used for non-SPS and SPS transmission schemes, then transmission adaptability is improved, but processing time increases due to additional blind decodes
Solution Approach 1:
The patent combines the DCI format structures for non-SPS and SPS schemes into a unified format with identical size and field composition. This merging eliminates the need for separate blind decode processes for different formats, reducing processing time while preserving the ability to support multiple transmission schemes through the same standardized structure
3Ease of manufacture
If DCI formats have different sizes for non-SPS and SPS schemes, then specific transmission parameters can be optimized, but the complexity of DCI detection increases for the UE
Solution Approach 1:
The patent applies homogeneity by making the DCI formats for non-SPS and SPS schemes identical in structure and size. Both formats use the same fields with the same bit allocations, creating a homogeneous detection process that simplifies UE implementation while still allowing optimized parameter values within each format to be configured according to specific transmission requirements
Data Source
AI summary
Certain aspects of the present disclosure generally relate to techniques for detecting downlink control information (DCI). In some cases, by making two different DCIs (e.g., used for different types of transmission schemes—one that supports SPS and one that does not support SPS) the same size, complexity at the UE (in terms of number of blind decodes) may be reduced. Since the DCIs are the same size, the UE may monitor a search space with decoding candidates for both types of DCI by doing a single decode per candidate.