Dynamic Slot Allocation for LTE V2X Congestion
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Solution Overview
Problem
In scenarios where LTE and ITS-G5 UEs coexist, existing methods struggle to effectively determine the number and location of slots for each radio access technology, leading to congestion and failed PSCCH decoding for LTE V2X technology.
Innovation Solution
A method where a user equipment (UE) calculates congestion level information for both LTE and ITS UEs in a predetermined section, and based on this information, determines the slots for LTE, ensuring proper resource allocation and minimizing congestion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If LTE and ITS-G5 UEs share the same frequency channel without dynamic slot allocation, then spectrum utilization is improved, but congestion occurs and PSCCH decoding fails for LTE V2X technology
Solution Approach 1:
The patent implements dynamic slot allocation where the number of slots for LTE and ITS-G5 systems is adjusted in real-time based on measured power levels. The UE determines a first number of slots for LTE and a second number of slots for ITS-G5 dynamically, rather than using fixed static allocation. This dynamic adjustment allows the system to adapt to changing traffic conditions and power levels, preventing congestion while maintaining spectrum utilization.
Solution Approach 2:
The patent changes the parameter of slot quantity allocation based on measured power levels. When the power level of LTE V2X signals exceeds that of ITS-G5 signals, more slots are allocated to LTE, and vice versa. This parameter change approach allows the system to optimize resource distribution according to actual channel conditions, resolving the contradiction between spectrum utilization and decoding reliability.
2Device complexity
If static slot allocation is used for LTE and ITS-G5 systems, then system complexity is reduced, but congestion occurs and measurement accuracy of LTE V2X UEs deteriorates
Solution Approach 1:
The patent employs a feedback mechanism where UEs measure power levels of LTE and ITS-G5 signals continuously and use this feedback information to dynamically adjust slot allocation. The measured power levels feed back into the slot determination process, creating a closed-loop system that automatically adapts to changing conditions. This feedback-driven approach improves measurement accuracy without requiring complex manual configuration.
Solution Approach 2:
The system enables UEs to autonomously determine their own slot allocations based on locally measured power levels. Each UE independently measures the power levels of LTE and ITS-G5 signals and self-determines the appropriate number of slots for each system without requiring complex network coordination. This self-service approach reduces system complexity while improving measurement precision.
3Reliability
If more slots are allocated to LTE V2X technology, then congestion is reduced, but the availability of slots for ITS-G5 technology decreases
Solution Approach 1:
The patent dynamically changes the parameter of slot allocation based on measured power levels. When LTE V2X power levels are higher, the system increases the first number of slots for LTE while correspondingly adjusting the second number of slots for ITS-G5. This dynamic parameter adjustment ensures that each technology receives adequate slots based on actual channel conditions, preventing both LTE congestion and ITS-G5 starvation.
Solution Approach 2:
The system transitions from static to dynamic slot allocation, allowing the number of slots for each technology to fluctuate based on real-time power level measurements. This dynamic approach enables the system to optimize the distribution of slots between LTE and ITS-G5, ensuring that congestion is reduced for the dominant technology while maintaining sufficient resources for the other.
Data Source
AI summary
One embodiment is a UE operation method related to a sidelink in a wireless communication system, the method comprising: a UE calculating first congestion information associated with an LTE terminal in a predetermined interval; the UE calculating second congestion information associated with an ITS terminal in the predetermined interval; and the UE determining slots for LTE on the basis of the first congestion information and the second congestion information, wherein the first congestion information is the ratio of the number of PSCCH candidate positions of which RSRP is equal to or greater than a first threshold value, to the total number of subchannels in the predetermined interval.