Sidelink DCI Size Alignment at Base Stations to Reduce Blind Detection
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Solution Overview
Problem
The increase in blind detection times due to varying sizes of DCI formats for sidelink and uplink/downlink communications in wireless communication systems, particularly in V2V/V2X scenarios, is not adequately addressed by existing technologies, leading to inefficiencies and increased system load.
Innovation Solution
A method for aligning the sizes of DCI formats by selecting a reference size based on a predefined rule, either by padding or reducing bits in DCIs, to minimize the number of blind detection attempts and maintain minimal size changes, ensuring compatibility and efficient decoding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If different DCI formats with varying sizes are used for sidelink and uplink/downlink communications, then the system can support diverse communication requirements, but the blind detection time increases and system load increases
Solution Approach 1:
The patent merges DCI formats with different sizes into unified size groups. DCI formats that originally had different bit lengths are now grouped such that formats within the same group have aligned sizes, reducing the number of different size categories from multiple distinct sizes to just two size groups. This merging reduces blind detection time while preserving adaptability through the grouping structure.
Solution Approach 2:
The patent changes the size parameter of DCI formats by adding padding bits or removing bits to align sizes within groups. For example, a DCI format with 30 bits may be padded to 32 bits, or a 34-bit format may be reduced to 32 bits. This parameter modification enables size alignment without fundamentally changing the DCI format structure or information content.
2Loss of time
If DCI sizes are aligned by padding or removing bits, then blind detection time is reduced, but the DCI format structure changes
Solution Approach 1:
The patent applies local quality changes by adding padding bits only to specific fields within DCI formats rather than fundamentally restructuring the entire format. The padding is applied locally to achieve size alignment while preserving the overall format structure and information hierarchy. This localized modification reduces structural complexity impact while achieving size alignment.
3Measurement precision
If multiple DCI size categories are maintained, then decoding precision can be optimized for each format, but the number of blind detection attempts increases
Solution Approach 1:
The patent creates universal size groups where DCI formats within the same group share a common size characteristic. This universality allows the UE to use the same decoding parameters and procedures for all DCI formats within a group, improving decoding efficiency. The two-size-group structure provides universal handling while maintaining enough differentiation to preserve necessary decoding precision for different communication types.
Data Source
AI summary
An integrated circuit includes generation circuitry and transmission circuitry. The generation circuitry uses a reference size for a search space to generate downlink control information (DCI) in a first DCI format used for sidelink communications. The transmission circuitry transmits the DCI in the first DCI format mapped on the search space. When a second DCI format used for base station communications is mapped on the search space and the second DCI format is larger than the first DCI format, the reference size for the search space is based on the second DCI format. When a third DCI format used for sidelink communications is mapped on the search space and the third DCI format is larger than the first DCI format, and the second DCI format larger than the third DCI format is not mapped on the search space, the reference size is based on the third DCI format.