V2V Sidelink Short TTI Scheduling for Low-Latency UE Communication
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Solution Overview
Problem
Existing wireless communication systems face challenges in enabling low-latency sidelink communication, particularly in scenarios where mobile devices are out of network coverage and require autonomous operation.
Innovation Solution
Implementing vehicle-to-vehicle (V2V) communication using sidelink technology with various transmission time intervals (TTIs), including short TTIs, to facilitate efficient data exchange between mobile devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If short transmission time intervals (TTIs) are implemented for V2V sidelink transmissions, then communication latency is reduced, but device complexity increases due to the need for multiple TTI configurations and control channel management
Solution Approach 1:
The system dynamically selects between short TTI and legacy TTI configurations based on communication requirements. Non-legacy UEs can choose short TTI for low-latency V2V applications, while legacy UEs continue using traditional TTI, allowing flexible adaptation without forcing all devices to handle complex short TTI operations simultaneously.
Solution Approach 2:
The patent segments the UE population into legacy UEs and non-legacy UEs with different TTI capabilities. This segmentation allows the system to implement short TTI functionality only where needed (for low-latency requirements) while maintaining compatibility with legacy devices, thereby reducing overall system complexity while still achieving latency improvement for specific use cases.
2Productivity
If short TTIs are used within legacy TTIs for non-legacy UEs, then sidelink communication efficiency is improved, but compatibility with legacy UEs becomes more difficult
Solution Approach 1:
The patent applies different TTI characteristics to different UE types: non-legacy UEs utilize short TTI for efficient V2V communication, while legacy UEs continue using traditional TTI. This local differentiation allows each UE type to operate optimally within its capabilities while maintaining overall system compatibility through parallel operation of both TTI types.
Solution Approach 2:
The system is designed to support multiple TTI types (both short TTI and legacy TTI) within the same sidelink framework. This multi-functionality enables the system to serve both legacy and non-legacy UEs simultaneously, allowing short TTI to improve efficiency for capable devices while legacy TTI maintains compatibility with older devices.
3Adaptability or versatility
If resource pools are allocated for both legacy and short TTI transmissions, then communication versatility is improved, but resource allocation complexity increases
Solution Approach 1:
The resource pool is segmented into different allocations for legacy TTI and short TTI transmissions. This segmentation allows the system to manage resources separately for each TTI type, reducing the complexity of managing a single unified resource pool while still providing versatile support for both legacy and advanced communication modes.
Data Source
AI summary
Embodiments of a User Equipment (UE) and methods for communication are generally described herein. The UE may select, from a plurality of short transmission time intervals (TTIs), a short TTI for a vehicle-to-vehicle (V2V) sidelink transmission by the UE. The short TTIs may occur within a legacy TTL. The short TTIs may be allocated for V2V sidelink transmissions by nonlegacy UEs. The legacy TTI may be allocated for V2V sidelink transmissions by legacy UEs. The UE may transmit, in accordance with the legacy TTI, a legacy physical sidelink control channel (PSCCH) to indicate, to legacy UEs, the V2V sidelink transmission by the UE. The UE may transmit, in accordance with the selected short TTI, a short PSCCH (sPSCCH) to indicate, to non-legacy UEs, the V2V sidelink transmission by the UE.