V2X Terminal Communication With Autonomous Resource Switching for Low Latency
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Solution Overview
Problem
Existing communication systems face challenges in meeting the low latency requirements of advanced V2X use cases, particularly for UEs operating in mode 3, where delays in the scheduling request and resource allocation processes exceed the required latency thresholds, leading to inadequate service delivery.
Innovation Solution
A method and device for V2X communication that enables UEs to autonomously select resources within a sensing window and perform V2X operations without relying on base station scheduling, utilizing a resource pool selection mechanism that includes partial sensing and random selection, ensuring timely data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UE operates in mode 3 and requests scheduling from a base station to transmit V2X data, then the UE can receive scheduled resources from the network, but the scheduling delay exceeds the latency requirement of advanced V2X use cases
Solution Approach 1:
The resource pool is segmented into two distinct types: mode 3 resource pool for network-scheduled transmission and mode 4 resource pool for autonomous selection. This segmentation allows the UE to switch between scheduling modes based on latency requirements, enabling timely transmission for urgent V2X data while maintaining network control for non-urgent traffic.
Solution Approach 2:
The UE dynamically switches between mode 3 and mode 4 resource pools based on the latency requirement of the V2X data. When the scheduling delay in mode 3 exceeds the latency threshold, the UE transitions to mode 4 for autonomous resource selection, thereby adapting to varying service requirements in real-time.
2Loss of time
If a UE autonomously selects resources in mode 4 without base station aid, then the latency requirement is met, but the UE cannot receive network-scheduled resources for services requiring shorter latency
Solution Approach 1:
The UE is configured with both mode 3 and mode 4 resource pools, enabling it to perform both network-scheduled and autonomous resource selection functions. This multi-functionality allows the UE to adapt to different service types: using mode 3 for services benefiting from network coordination and mode 4 for services requiring ultra-low latency.
Solution Approach 2:
The system dynamically adapts the resource selection mode based on service requirements. The UE evaluates the latency requirement of each V2X service and selects the appropriate resource pool (mode 3 or mode 4) accordingly, ensuring optimal performance for diverse service types.
3Reliability
If the UE uses the existing mode 3 scheduling process, then network control is maintained, but the delay in transmitting SR and BSR prevents meeting future communication system latency requirements
Solution Approach 1:
The resource allocation mechanism is segmented into network-controlled mode 3 and autonomous mode 4. This segmentation enables the system to bypass the slow SR/BSR transmission process for time-critical V2X data by directly using mode 4 resource pools, thereby significantly improving transmission speed while preserving network control for non-urgent traffic.
Solution Approach 2:
The UE is pre-configured with mode 4 resource pools by the network before needing urgent transmission. This preliminary configuration allows the UE to immediately switch to autonomous resource selection when low-latency transmission is required, eliminating the need for time-consuming scheduling request processes.
Data Source
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AI summary
A vehicle-to-everything (V2X) communication method of a terminal in a wireless communication system and an apparatus using same method are provided. The method comprises: receiving a signal for setting a first mode and a second mode from a base station; performing V2X communication with another terminal according to the first mode; and, when a specific condition is satisfied, performing V2X communication with the another terminal according to the second mode or according to the first mode and the second mode, wherein the first mode is a mode for performing V2X communication using resources scheduled by the base station, and the second mode is a mode for performing V2X communication using resources determined by autonomous scheduling of the terminal.