Range-Specific PSCCH Resource Pools for NR Sidelink Control
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Solution Overview
Problem
Existing 3GPP New Radio (NR) wireless communication systems do not support WTRU-to-WTRU communication designs, such as device-to-device (D2D) or V2X communication, which are necessary for advanced use cases like vehicles platooning and remote driving, and LTE-based solutions are not compatible with NR networks.
Innovation Solution
A physical sidelink control channel (PSCCH) design is developed for NR, enabling hybrid automatic repeat request (HARQ) feedback and DM-RS density determination based on HARQ parameters and association information, with DM-RS density indicators and resource pool identities, to facilitate sidelink communication between WTRUs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LTE-based WTRU-to-WTRU communication solutions are used, then device-to-device communication is supported, but compatibility with NR networks is lost
Solution Approach 1:
The patent applies parameter changes by adapting LTE sidelink communication parameters to NR network requirements. Specifically, it modifies physical layer parameters including cyclic prefix lengths, subcarrier spacings, and resource allocation schemes to ensure compatibility with NR while maintaining D2D communication functionality. This allows the system to achieve both communication reliability and network compatibility.
2Productivity
If NR Uu interface design is used, then communication between gNB and WTRUs is optimized, but WTRU-to-WTRU communication is not supported
Solution Approach 1:
The patent implements universality by designing a multi-functional communication system that can operate in both traditional Uu interface mode (gNB-to-WTRU) and sidelink mode (WTRU-to-WTRU). The NR frame structure and physical channels are designed to support multiple communication modes within a unified framework, allowing the system to adapt to different service requirements without sacrificing communication efficiency.
3Measurement precision
If DM-RS density is increased for better channel estimation, then demodulation accuracy improves, but resource overhead increases
Solution Approach 1:
The patent applies dynamics by making DM-RS density configurable and adaptable based on channel conditions and service requirements. The system can dynamically adjust the number and position of DM-RS symbols within the NR frame structure, allowing optimal channel estimation accuracy while minimizing resource overhead. This dynamic adjustment is controlled through RRC configuration and can be adapted to different sidelink scenarios.
Data Source
AI summary
A wireless transmit receive unit (WTRU) may receive configuration information regarding one or more range-specific physical sidelink control channel (PSCCH) resource pools. In an example, each range-specific PSSCH resource pool includes one or more PSCCH resources. The WTRU may determine a range between the first WTRU and a second WTRU. Further, the WTRU may determine a range-specific PSSCH resource pool of the one or more range-specific PSSCH resource pools based on the range. Also, the WTRU may determine a PSCCH resource within the determined range-specific PSSCH resource pool. Moreover, the WTRU may transmit control information to the second WTRU in the determined PSCCH resource. Additionally or alternatively, the one or more PSCCH resources are one or more PSCCH resource units (PRUs). Additionally or alternatively, the range is determined based on receipt of positioning information from the second WTRU.