Adaptive SPS Duration Selection for Vehicular Communication Flooding
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Solution Overview
Problem
In wireless communication networks, especially for vehicular communication systems, the repeated transmission of messages with short Semi-Persistent Scheduled (SPS) intervals leads to increased resource utilization and system flooding, particularly in fully automated driving scenarios where end-to-end latency is low.
Innovation Solution
User Equipment (UE) in wireless communication networks is configured to select the SPS overall time duration from a plurality of sets, allowing for adaptive duration selection based on specific criteria, such as safety, traffic efficiency, and environmental conditions, to avoid flooding by transmitting messages in shorter intervals over longer durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If messages are transmitted with short SPS intervals to reduce latency, then end-to-end latency is reduced, but resource utilization increases and system flooding occurs
Solution Approach 1:
The patent applies dynamics by making the SPS interval and duration adaptive rather than fixed. The UE dynamically adjusts transmission parameters based on real-time conditions such as channel quality, traffic load, and message priority, allowing the system to optimize between latency and resource utilization dynamically during operation
Solution Approach 2:
The patent changes physical or operational parameters by allowing variable SPS intervals and durations instead of fixed values. The system modifies transmission parameters such as interval length and total duration based on detected conditions, enabling flexible optimization of the contradiction between fast transmission and resource conservation
2Reliability
If SPS transmissions continue for long durations to ensure complete message delivery, then reliability is improved, but system flooding increases
Solution Approach 1:
The patent implements feedback mechanisms where the UE monitors transmission effectiveness and system conditions during SPS operations. Based on this feedback, the UE adjusts duration and interval parameters to achieve reliable delivery while avoiding excessive transmissions that cause system flooding
Solution Approach 2:
The patent applies partial action by transmitting messages for optimized durations rather than maximum possible durations. The system uses sufficient transmission length to ensure reliability while stopping before causing harmful flooding, finding the optimal middle ground
3Device complexity
If fixed SPS duration is used for all intervals, then device complexity is reduced, but adaptability to different traffic conditions deteriorates
Solution Approach 1:
The patent transitions from static fixed durations to dynamic adaptive durations that automatically adjust based on traffic conditions. This dynamic approach maintains relatively simple UE operation while significantly improving adaptability to varying network and environmental conditions
Data Source
AI summary
A user equipment, UE, for a wireless communication network, performs Semi-Persistent Scheduled, SPS, transmissions of messages using SPS, e.g., data or control messages, in the wireless communication network with a certain SPS interval and during a certain SPS overall time duration. The UE selects the certain SPS overall time duration for the certain SPS interval from one of a plurality of sets of SPS overall time durations, each set including a plurality of SPS overall time durations.