Sidelink Bandwidth Parts for Low-Latency UE-to-UE Transmission
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Solution Overview
Problem
Legacy D2D and V2X sidelink communication systems face high latency and reliability issues due to multi-step scheduling information transmission, which cannot meet the requirements of 5G Ultra-Reliable and Low-Latency Communications (URLLC) services, especially in scenarios with poor channel conditions.
Innovation Solution
The method involves configuring UEs with dedicated bandwidth parts (BWPs) for sidelink reception and transmission, using common PRB grids defined by sidelink synchronization signals, allowing direct UE-to-UE communication without base station intermediation, and enabling simultaneous activation/deactivation of BWPs to reduce latency and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-step scheduling information transmission is used in legacy D2D and V2X sidelink communication systems, then base station scheduling control is maintained, but transmission latency increases and reliability decreases
Solution Approach 1:
The patent extracts the scheduling control function from the base station and transfers it to the transmitting UE. The base station no longer performs detailed per-UE sidelink scheduling, but rather configures resource pools and activation/deactivation signals. This extraction eliminates the multi-step scheduling information transmission process, reducing latency while maintaining reliability through direct UE-to-UE scheduling.
Solution Approach 2:
The base station performs preliminary configuration by setting up resource pools and their activation/deactivation states before actual sidelink communication occurs. This preliminary action allows UEs to have pre-configured scheduling parameters and resource allocations, eliminating the need for real-time base station scheduling decisions and reducing transmission latency while ensuring reliable communication.
2Speed
If base station schedules sidelink resources through multiple steps, then centralized control is maintained, but communication speed decreases
Solution Approach 1:
The patent extracts scheduling control authority from the base station to the transmitting UE. The base station's role is reduced to configuring resource pools and sending activation/deactivation signals, while the transmitting UE independently determines scheduling parameters. This extraction significantly increases communication speed by eliminating base station processing delays while the distributed control structure actually reduces overall system complexity.
Solution Approach 2:
The patent introduces dynamic activation and deactivation of resource pools through signaling from the base station. This dynamic mechanism allows flexible resource allocation without requiring continuous base station scheduling control. The transmitting UE activates or deactivates resource pools based on communication needs, increasing communication speed while the automated activation/deactivation process simplifies control complexity compared to continuous manual scheduling.
3Productivity
If dedicated BWPs are configured for sidelink communication, then frequency resource allocation is optimized, but configuration complexity increases
Solution Approach 1:
The patent segments the frequency spectrum into dedicated bandwidth parts (BWPs) for sidelink communication, separating these from traditional downlink and uplink carriers. This segmentation allows optimized frequency resource allocation for sidelink services while the modular BWP structure actually simplifies configuration complexity by providing clear, discrete resource blocks that can be independently managed and activated.
Solution Approach 2:
The patent makes the BWP configuration framework universal by allowing the same mechanism to be applied across different carrier types (sidelink carriers, UL carriers, TDD carriers). The base station uses a unified configuration approach that works for various carrier configurations, optimizing frequency resource allocation efficiency while reducing configuration complexity through standardization and multi-functionality.
Data Source
AI summary
A method and apparatus for sidelink information transmission, and a terminal device and a network device. In the method, a first UE (user equipment) receives first configuration information from a base station, wherein the first configuration information is to configure the first UE with at least one first bandwidth part (BWP) for sidelink reception; and the UE receives sidelink information from a second UE on the first BWP.