Multicast QoS Control for V2X Networks
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Solution Overview
Problem
Current wireless communication systems, particularly in vehicular networks, face challenges in efficiently managing quality of service (QoS) levels for group communication, leading to suboptimal data transmission and reception among vehicles, which affects reliability and efficiency.
Innovation Solution
A method where a first user equipment (UE) in a vehicle-to-everything (V2X) network determines and sets a transmission QoS level based on the lowest supported QoS level among a set of UEs, allowing for multicast data transmission, ensuring all UEs can support the level, and dynamically adjusts QoS levels based on traffic and radio conditions using a window-based timing mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed high QoS level is used for multicast transmission, then transmission quality is improved, but not all UEs can support the required QoS level leading to transmission failures
Solution Approach 1:
The patent implements dynamic QoS level adjustment where the transmitting UE monitors QoS feedback from receiving UEs and adapts the transmission QoS level over time. The QoS level is no longer fixed but changes based on the minimum supported level reported by group members, resolving the contradiction between maintaining high transmission quality and ensuring compatibility with all receivers.
Solution Approach 2:
The patent introduces a feedback mechanism where receiving UEs report their supported QoS levels to the transmitting UE. This feedback loop enables the transmitting UE to adjust its transmission QoS level to match the capabilities of the least capable receiver in the group, ensuring both reliability and universal compatibility.
2Reliability
If individual QoS levels are negotiated with each UE, then QoS optimization is improved, but signaling overhead and complexity increase significantly
Solution Approach 1:
The patent merges individual QoS negotiations into a single group-level negotiation. Instead of establishing separate QoS parameters with each UE, the system uses a group identifier to represent all receiving UEs, and QoS feedback is aggregated at the group level. This significantly reduces signaling overhead while maintaining optimized QoS adjustment based on group capabilities.
3Reliability
If QoS level is adjusted frequently to match changing conditions, then transmission quality is improved, but system stability and power consumption worsen
Solution Approach 1:
The patent implements periodic QoS level adjustment rather than continuous adjustment. The transmitting UE adjusts the QoS level at predetermined intervals or trigger events (such as when minimum supported QoS changes), rather than responding to every fluctuation in channel conditions. This reduces the frequency of adjustments, lowering power consumption while maintaining adequate transmission quality.
Data Source
AI summary
The present disclosure relates to methods and devices for group communication which may include a first UE and a set of UEs. In one aspect, the first UE may receive from each UE of the set of UEs a PDU including a header that includes a QoS level for the UE. The first UE can also determine a supported QoS level for the first UE. In another aspect, the first UE can set a transmission QoS level for the first UE to be a lowest QoS level of the determined supported QoS level and the QoS level from each UE of the set of UEs. In a further aspect, the first UE can transmit by multicast to the set of UEs a PDU based on the set transmission QoS level.