Sidelink Grant-Only Indicator Decoupling SCI-2 from Data
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently multiplexing sidelink control information (SCI)-only grants and data-only traffic, leading to resource wastage and decreased channel sensing accuracy in V2X Mode 2, where UEs autonomously select sidelink resources without base station intervention.
Innovation Solution
Transmitting a grant-only indicator to decouple SCI-2 from PSSCH data, allowing SCI-2-only grants to be multiplexed with data-only traffic in a PSSCH transmission, indicating resource allocation for a subsequent slot, thereby enabling UEs to schedule sidelink transmissions while transmitting data-only traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SCI-2 is coupled with PSSCH data in the same slot, then control information and data can be transmitted together, but resource allocation flexibility and channel sensing accuracy deteriorate
Solution Approach 1:
The patent segments the SCI-2 transmission from PSSCH data transmission by introducing a grant-only indicator that separates the grant indication function from data transmission. This allows SCI-2 to be transmitted in a dedicated grant-only slot while PSSCH data is transmitted in separate data-only slots, resolving the conflict between transmission efficiency and channel sensing accuracy by spatial-temporal separation of control and data functions.
Solution Approach 2:
The patent introduces a new dimensional parameter - the grant-only indicator dimension - that enables independent control of grant transmission timing from data transmission timing. By adding this signaling dimension, the system can indicate resource allocations for future slots without being constrained to transmit SCI-2 only in the same slot as PSSCH data, thereby improving both resource allocation flexibility and channel sensing accuracy.
2Adaptability or versatility
If SCI-2-only grants are transmitted separately from data traffic, then resource allocation flexibility improves, but resource utilization deteriorates due to increased overhead
Solution Approach 1:
The patent applies preliminary action by transmitting the SCI-2-only grant in advance in a grant-only slot before the actual data transmission occurs in subsequent slots. This allows receiving UEs to perform channel sensing and prepare for upcoming data transmissions without waiting for data arrival, improving resource allocation flexibility while the efficient grant format minimizes overhead and preserves resource utilization.
Solution Approach 2:
The grant-only indicator serves as an intermediary signaling mechanism that bridges grant transmission and data transmission functions. It enables the system to indicate resource allocations without requiring simultaneous data transmission, providing the flexibility of separate grant indication while maintaining efficient resource usage through compact signaling design that minimizes overhead.
3Device complexity
If UEs transmit both SCI-2 and data in the same PSSCH transmission, then transmission complexity is reduced, but scheduling accuracy for subsequent slots deteriorates
Solution Approach 1:
The patent extracts the grant indication function from the combined SCI-2 and data transmission by introducing a separate grant-only indicator mechanism. This extraction allows SCI-2 to be transmitted independently in grant-only slots with dedicated resource allocation indications, separating the scheduling function from data transmission and thereby improving scheduling accuracy for subsequent slots while maintaining manageable transmission complexity through standardized signaling procedures.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may transmit, to a second UE, a grant-only indicator to indicate that a second stage sidelink control information (SCI-2) is decoupled from physical sidelink shared channel (PSSCH) data in a slot, and that the SCI-2 indicates an SCI-2-only grant. The first UE may transmit, to the second UE in the slot, the SCI-2-only grant multiplexed with data-only traffic in a first PSSCH transmission based at least in part on the grant-only indicator, wherein the SCI-2-only grant indicates a resource allocation for a subsequent slot. Numerous other aspects are described.