Uplink Scheduling Request Format Mapping for V2X Delay Reduction
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Solution Overview
Problem
The existing uplink resource request procedure in LTE systems, particularly in V2X systems, fails to meet the requirement of low data transmission delay, resulting in delays higher than the needed 3 ms to 5 ms for D2D communication.
Innovation Solution
A method is introduced where user equipment (UE) determines an uplink scheduling request format based on a mapping relationship between sidelink data and different uplink scheduling request formats, enabling timely resource grants from the network device for data transmission, thereby reducing transmission delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the existing uplink resource request procedure is used in LTE systems, then the system can maintain backward compatibility and simplicity, but the data transmission delay exceeds the required 3 ms to 5 ms for V2X D2D communication
Solution Approach 1:
The patent segments the uplink resource request procedure into two independent modes: Mode 1 (traditional SR-based request) and Mode 2 (direct PUCCH-based request). This segmentation allows the system to maintain backward compatibility while introducing a new low-latency path for V2X communications, resolving the contradiction between reducing delay and maintaining simplicity.
Solution Approach 2:
The patent introduces dynamic selection capability where UEs can choose between different uplink resource request modes based on their specific needs. The network device also dynamically determines which mode to use based on configured parameters, enabling flexible adaptation to different latency requirements without fixing the entire system architecture.
2Speed
If multiple uplink scheduling request formats are introduced to reduce delay, then V2X low latency requirement can be met, but the system complexity and configuration requirements increase
Solution Approach 1:
The patent designs multiple uplink scheduling request formats that can be used by different UE types (first UE and second UE) with different capabilities. The formats are designed to be universally applicable across the network, with the network device determining which format to use based on configuration, thereby reducing the burden on individual UEs while maintaining system-wide compatibility.
Solution Approach 2:
The network device acts as an intermediary that determines which uplink scheduling request format should be used based on configured parameters. This intermediary role simplifies the UE's decision-making process and reduces the complexity at the UE level, while still enabling multiple formats to be used for optimizing performance.
3Ease of operation
If traditional uplink scheduling request procedure is used, then UE implementation is simple, but the resource grant timing is too slow for V2X requirements
Solution Approach 1:
The patent introduces a preliminary action where the network device determines and configures the uplink scheduling request format in advance, before the actual resource request is made. This preliminary configuration allows the UE to directly use the appropriate format without complex real-time decision-making, maintaining simplicity while achieving faster resource grants.
Data Source
AI summary
Disclosed are a radio communication method and equipment. The radio communication method comprises: a user equipment determines, on the basis of mapping relations, an uplink scheduling request format corresponding to sidelink data that needs to be transmitted, the mapping relations comprising mapping relations between different sidelink data and different uplink scheduling request formats; and the user equipment transmits an uplink scheduling request to a network device on the basis of the uplink scheduling request format.