LTE Sidelink Timing Offset Configuration for NR V2X
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently performing Vehicle-to-Everything (V2X) communication, particularly in managing timing offsets for LTE sidelink transmission between devices, which affects the reliability and latency of V2X services.
Innovation Solution
A method and apparatus for performing LTE sidelink communication by transmitting UE capability information to a base station, receiving a radio resource control (RRC) parameter, and performing LTE sidelink transmission based on timing offset candidate values configured by the RRC parameter, where the timing offset included in the UE capability information is one of the candidate values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing offset management is performed in LTE sidelink transmission for NR V2X, then communication reliability is improved, but system complexity increases due to coordination between LTE and NR timing structures
Solution Approach 1:
The base station acts as an intermediary that provides timing offset configuration information to the UE. The base station receives timing offset values from the network and translates/configures them for LTE sidelink transmission, mediating between the NR network timing structure and the LTE sidelink requirements. This reduces UE complexity by centralizing the timing coordination function in the base station.
Solution Approach 2:
The patent applies parameter changes by configuring specific timing offset values (K2, K3, K4, K5, K6) that adjust the timing relationship between downlink control information and uplink data transmission. These parameter changes allow the system to optimize timing alignment for V2X services while maintaining compatibility with existing LTE sidelink frameworks, resolving the contradiction between reliability improvement and complexity increase.
2Loss of time
If timing offset configuration is provided for V2X services, then latency is reduced, but signaling overhead increases
Solution Approach 1:
The timing offset configuration mechanism is designed to serve multiple functions: it provides timing alignment for V2X services, maintains compatibility with existing LTE uplink timing structures, and enables flexible latency optimization for different V2X service types (e.g., BSM, CAM, DENM). This multi-functionality reduces the need for separate signaling mechanisms, thereby reducing overall signaling overhead while achieving latency reduction.
Solution Approach 2:
The patent implements dynamic timing offset configuration where the base station can adjust timing parameters (K2-K6) based on current network conditions and service requirements. This dynamic adjustment allows the system to optimize latency in real-time without requiring constant reconfiguration signaling, as the base station can modify timing parameters adaptively based on existing RRC connections and current V2X traffic patterns.
Data Source
AI summary
According to an embodiment of the present disclosure, a method for performing sidelink communication by a first device is provided. The method may comprise: transmitting, to a base station, UE capability information of the first device; receiving, from the base station, a radio resource control (RRC) parameter based on the UE capability information; and performing Long Term Evolution (LTE) sidelink transmission to a second device, based on first timing offset candidate values related to the LTE sidelink transmission to the second device which are configured based on the RRC parameter, wherein a first timing offset included in the UE capability information is one of the first timing offset candidate values.