Sidelink Carrier Aggregation via Dual SCI Formats
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Solution Overview
Problem
Current sidelink communication systems face complexity in implementing carrier aggregation, which hinders effective cross-carrier scheduling, particularly in device-to-device (D2D) communication systems like 5G NR, due to the inability of existing UEs to read carrier indicator fields (CIF) for multiple component carriers, leading to inefficiencies in resource allocation and data transmission.
Innovation Solution
The proposed solution involves transmitting both extended and current forms of sidelink control information (SCI) to enable UEs to read carrier indication fields across multiple component carriers, allowing for cross-carrier scheduling by including a carrier indication field (CIF) in extended SCIs and transmitting both forms in relevant component carriers to ensure compatibility with diverse UE capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing UEs are used without extended SCI, then device compatibility is maintained, but cross-carrier scheduling capability is lost
Solution Approach 1:
The solution segments SCI transmission into two distinct formats: extended SCI for UEs with cross-carrier scheduling capability and current SCI for legacy UEs. This segmentation allows the system to support advanced features for capable devices while maintaining compatibility with existing devices, resolving the contradiction between adaptability and device complexity.
Solution Approach 2:
The system dynamically selects which SCI format to transmit based on the receiver UE's capability. The transmitter determines whether the receiver supports extended SCI and adapts the transmission accordingly, enabling cross-carrier scheduling when needed while falling back to traditional formats for legacy devices, thus balancing versatility and complexity.
2Adaptability or versatility
If multiple SCI formats are transmitted, then UE capability compatibility is improved, but control information overhead increases
Solution Approach 1:
The solution applies local quality by transmitting different SCI formats tailored to specific receiver UEs based on their capabilities. Instead of universally transmitting both formats to all UEs, the system transmits only the appropriate format to each UE, reducing overall control information overhead while maintaining compatibility across diverse UE types.
3Productivity
If carrier aggregation is implemented, then data transmission efficiency is improved, but implementation complexity increases
Solution Approach 1:
The extended SCI format acts as an intermediary that carries carrier indication fields (CIF) to enable cross-carrier scheduling. This intermediary mechanism allows carrier aggregation to be implemented efficiently by providing the necessary scheduling information without requiring complex modifications to the underlying physical layer, thus improving data transmission efficiency while managing implementation complexity.
Data Source
AI summary
This disclosure relates to sidelink carrier aggregation and cross-carrier scheduling indications in sidelink control information (SCI). Specifically, in one aspect, a transmit UE may configure a multi-component carrier grant including a plurality of component carriers for a physical sidelink share channel (PSSCH). The transmit UE may further transmit, one or both of a set of first SCI each including a single component carrier grant corresponding to one component carrier from the multi-component carrier grant and associated with scheduling information of the one component carrier, or a second SCI including the multi-component carrier grant and associated with scheduling information of the plurality of component carriers. In another aspect, a receiver UE may receive one or both of the set of first SCI each including the single component carrier grant corresponding to one component carrier from the multi-component carrier grant, or the second SCI including the multi-component carrier grant.