Sidelink Control Information Segmentation for UE Compatibility
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Solution Overview
Problem
The physical-layer control information in sidelink communication systems has limited scalability, making it difficult to support a large number of new technologies and functions, leading to compatibility issues with legacy User Equipment (UE).
Innovation Solution
A method that involves receiving and transmitting Sidelink Control Information (SCI) and Transport Blocks (TB) on sidelink, using a bit group to indicate the format of the second SCI, allowing compatibility with both legacy and advanced UE, supporting features like multi-carrier and multi-antenna communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new signaling formats and messages are defined to support latest functions and technologies, then system functionality and adaptability are improved, but compatibility with legacy UE deteriorates
Solution Approach 1:
The SCI is segmented into two stages: first-stage SCI (1SCI) and second-stage SCI (2SCI). The 1SCI contains basic scheduling information compatible with legacy UE, while the 2SCI contains advanced features for new UE. This segmentation allows legacy UE to process only 1SCI and maintain compatibility, while new UE can process both stages to access enhanced functionality.
Solution Approach 2:
The 1SCI acts as an intermediary between legacy control mechanisms and new advanced features. It provides a bridge that legacy UE can understand while enabling the transmission of 2SCI that carries new functionality, thus mediating between old and new system requirements.
2Adaptability or versatility
If physical-layer control information is expanded to support more technologies, then system adaptability is improved, but control information scalability deteriorates
Solution Approach 1:
The patent transitions from a single-stage control information structure to a two-dimensional hierarchical structure with 1SCI and 2SCI. This dimensional change allows the system to support more technologies by adding vertical layers rather than horizontally expanding a single structure, improving scalability.
Solution Approach 2:
The 2SCI is nested within the resource allocation framework established by 1SCI. The 1SCI schedules resources that contain the 2SCI, creating a nested structure where inner control information is contained within outer control information, allowing complex features to be organized in manageable hierarchical units.
3Reliability
If legacy UE continue to use existing SCI formats, then compatibility is maintained, but support for new functions deteriorates
Solution Approach 1:
The system dynamically adapts to different UE types through the two-stage SCI structure. Legacy UE dynamically process only 1SCI maintaining compatibility, while new UE dynamically process both 1SCI and 2SCI to access new functions. This dynamic behavior allows the system to serve multiple UE generations simultaneously.
Data Source
AI summary
The present application discloses a method and device for wireless communications, comprising receiving first Sidelink Control Information (SCI), a second SCI and a first Transport Block (TB) on sidelink; herein, the first SCI schedules a first Physical Sidelink Shared Channel (PSSCH), and both the second SCI and the first TB are transmitted in the first PSSCH; candidates of a format of the second SCI comprise SCI format 2-A, SCI format 2-B, SCI format 2-C and a first format subset; the first format subset comprises at least a first SCI format; the present application determines a format of a second SCI by transmitting the first bit group, which can better support new functions and technologies on sidelink.