NR Sidelink PSCCH Multi-Sub-Channel Allocation for QoS Flexibility
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Solution Overview
Problem
Existing LTE V2X systems struggle to support advanced NR V2X use cases with larger packet sizes, lower latency, and varying traffic patterns, particularly in unicast and multicast transmissions, requiring improved PSCCH design for high capacity and reliability.
Innovation Solution
The proposed solution involves configuring NR PSSCH and PSCCH transmissions using non-contiguous frequency resource allocation, allowing for both TDM and FDM configurations, and determining PSCCH resources based on various parameters to meet the diverse QoS requirements of NR V2X use cases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LTE V2X uses contiguous sub-channel allocation for PSSCH, then transmission simplicity is maintained, but NR V2X cannot support non-contiguous frequency resource allocation which is required for advanced use cases with larger packet sizes and lower latency
Solution Approach 1:
The patent segments the frequency resources into multiple sub-channels and allows selective allocation of non-contiguous sub-channels for PSSCH transmission. This enables flexible resource allocation by dividing the frequency spectrum into manageable units that can be independently assigned, resolving the contradiction between allocation flexibility and system complexity.
Solution Approach 2:
The patent introduces dynamic resource allocation mechanisms where the gNB can adaptively configure sub-channel assignments based on traffic patterns, QoS requirements, and channel conditions. This dynamic approach allows the system to switch between contiguous and non-contiguous allocations as needed, achieving versatility without permanent complexity.
2Adaptability or versatility
If LTE V2X supports only broadcast transmission with fixed packet sizes, then system simplicity is maintained, but NR V2X cannot support unicast and multicast transmissions with varying QoS requirements
Solution Approach 1:
The patent designs a universal resource allocation framework that can handle broadcast, unicast, and multicast transmissions through a common set of mechanisms. By creating a multi-functional system where the same resource allocation procedures serve multiple transmission types, the patent achieves versatility without proportionally increasing complexity.
Solution Approach 2:
The patent utilizes parameter-based configuration where transmission characteristics (unicast/multicast/broadcast, QoS requirements, packet sizes) are controlled through configurable parameters rather than separate system structures. This allows flexible adaptation to different transmission modes by changing parameters while maintaining the same underlying system architecture.
3Productivity
If PSCCH is always transmitted adjacent to PSSCH, then frequency resource efficiency is improved, but reliability of control channel transmission may be compromised in certain channel conditions
Solution Approach 1:
The patent applies local quality principles by allowing different spatial relationships between PSCCH and PSSCH based on local channel conditions. In good channel conditions, adjacent allocation maximizes efficiency, while in poor conditions or specific frequency ranges, non-adjacent allocation improves reliability. This localized adaptation resolves the contradiction between efficiency and reliability.
4Quantity of substance
If NR V2X supports larger packet sizes with multi-sub-channel allocation, then transmission capacity is improved, but resource allocation complexity and overhead increase
Solution Approach 1:
The patent manages multi-sub-channel allocation complexity by introducing structured dimensions for resource organization, such as sub-channel groups and resource pools. This dimensional organization allows the system to handle large packet sizes across multiple sub-channels while maintaining manageable complexity through hierarchical resource management.
Data Source
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AI summary
Methods and apparatuses for Sidelink (SL) communication are disclosed herein. A method for SL communication performed by a Wireless Transmit/Receive Unit (WTRU) may comprise determining to transmit Sidelink Control Information (SCI) over a Physical Sidelink Control Channel (PSCCH). The method may further comprise selecting one or more sub-channels from a Physical Sidelink Shared Channel (PSSCH) in which to allocate time and frequency resources for the PSCCH. The method may further comprise allocating time and frequency resources within the PSCCH in which to transmit the SCI. The allocation of time and frequency resources may be based on at least one of an SCI format type, a Layer 1 (L1) Identifier (ID), a priority, or a Quality of Service (QoS) requirement. The method may further comprise transmitting the SCI over the determined time and frequency resources.