V2X Resource Selection for Limited Transmission Chains
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Solution Overview
Problem
Conventional V2X communication systems with limited transmission capability face challenges in selecting suitable transmission resources for multi-carrier systems, particularly when the number of transmission chains is less than the number of configured carriers, leading to inefficiencies in carrier aggregation.
Innovation Solution
A method for a user equipment (UE) with limited transmission capability, where a first resource is selected in a first carrier if using a specific subframe in a second carrier exceeds its transmission capability, and a second resource is randomly chosen from remaining subframes in the second carrier for transmitting V2X signals, considering channel busy ratio (CBR) and ProSe priority per packet (PPPP) to efficiently manage resource selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If carrier aggregation is used in V2X communication, then transmission capacity and data rate are improved, but device complexity and resource selection difficulty increase when transmission chains are limited
Solution Approach 1:
The patent segments the resource selection process into two distinct phases: intra-carrier resource selection (selecting resources within the same carrier) and inter-carrier resource selection (selecting resources across different carriers). This segmentation simplifies the overall resource selection complexity by breaking down the multi-carrier problem into manageable sub-problems, allowing the UE to handle limited transmission chains more effectively while still benefiting from carrier aggregation.
2Adaptability or versatility
If the number of configured carriers exceeds the number of transmission chains, then carrier aggregation capability is improved, but transmission reliability deteriorates due to inability to transmit simultaneously on all carriers
Solution Approach 1:
The patent introduces dynamic resource selection mechanisms that adapt to the UE's transmission chain availability. The system dynamically determines whether to perform intra-carrier or inter-carrier resource selection based on current transmission conditions and capabilities. This dynamic approach ensures that transmission reliability is maintained by selecting resources that the UE can actually transmit on, while still utilizing carrier aggregation when possible.
Solution Approach 2:
The patent changes the resource selection parameters and criteria based on the UE's transmission capability status. When transmission chains are limited, the system adjusts the resource selection parameters to favor intra-carrier resources or specific inter-carrier combinations that are feasible. This parameter adaptation allows the system to maintain reliability by ensuring selected resources match the UE's actual transmission capacity.
3Ease of operation
If random resource selection is performed across all subframes, then resource allocation flexibility is improved, but transmission efficiency deteriorates when transmission capability constraints are exceeded
Solution Approach 1:
The patent performs preliminary resource selection within the same carrier before attempting inter-carrier resource selection. This preliminary action ensures that the UE selects resources it can definitely transmit on first, then supplements with additional carriers if transmission chains permit. This staged approach maintains flexibility while improving efficiency by avoiding selections that would exceed transmission capabilities.
Data Source
AI summary
Provided are a method for transmitting a vehicle-to-everything (V2X) signal performed by a user equipment (UE) having a limited transmission capability in a multi-carrier system and a UE using the method. The method includes selecting a first resource in a first carrier, if using a specific subframe in a second carrier exceeds a transmission capability of the UE considering the first resource, selecting a second resource randomly among the remaining subframes except the specific subframe in the second carrier and transmitting the V2X signal using the first resource and the second resource.