Semi-Persistent Scheduling for V2X Traffic Adaptation
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Solution Overview
Problem
The unpredictability of V2X traffic characteristics, such as message size and generation frequency, makes it challenging for existing delay-aware schedulers like semi-persistent scheduling (SPS) to efficiently manage resources in LTE networks, leading to inefficient resource utilization and high signaling overhead.
Innovation Solution
Implementing an interrupt-based SPS protocol where periodic resources are provisioned conservatively by the base station, with individual acknowledgement by the UE, allowing the reuse of unacknowledged resources and configuration of multiple SPS configurations for different traffic types with varying periodicity and QoS requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If semi-persistent scheduling is used for V2X traffic, then resource allocation is simplified, but resource utilization becomes inefficient due to unpredictable traffic characteristics
Solution Approach 1:
The patent applies dynamics by transitioning from static conservative resource provisioning to dynamic resource allocation. The base station dynamically adjusts resource allocation based on actual traffic characteristics and UE feedback, allowing the system to adapt to unpredictable V2X traffic patterns while maintaining scheduling simplicity through automated decision-making processes.
Solution Approach 2:
The patent implements feedback mechanisms where UEs provide information about their actual resource usage and traffic characteristics to the base station. This feedback loop enables the base station to optimize resource allocation by learning from actual transmission patterns, thereby improving resource utilization efficiency without increasing scheduling complexity at the UE level.
2Device complexity
If conservative resource provisioning is used, then resource allocation is simplified, but signaling overhead increases due to frequent resource reallocation
Solution Approach 1:
The patent applies preliminary action by pre-configuring multiple SPS configurations with different periodicities and resource allocations before actual traffic occurs. This allows the system to prepare appropriate resource templates in advance, reducing the need for frequent reallocation signaling while maintaining allocation simplicity through predefined options.
Solution Approach 2:
The patent utilizes parameter changes by allowing the base station to modify scheduling parameters such as periodicity, resource blocks, and timing based on feedback information. This enables efficient resource adaptation without requiring complete reconfiguration signaling, as the system can adjust parameters within existing framework rather than creating entirely new allocations.
3Device complexity
If single SPS configuration is used, then device complexity is reduced, but adaptability to different traffic types deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the SPS configuration into multiple independent configuration sets, each tailored for specific traffic types or periodicity requirements. This allows the system to maintain simple individual configurations while achieving high adaptability through the collection of segmented configurations, as each segment can be independently optimized for its target traffic characteristics.
Solution Approach 2:
The patent implements universality by designing a multi-functional SPS framework that can handle various traffic types through a unified base station control mechanism. The base station uses a single control logic that manages multiple configurations, making the system universally applicable to different V2X scenarios without requiring separate complex scheduling mechanisms for each traffic type.
Data Source
AI summary
In one aspect, a wireless device receives, from a wireless network node, two or more semi-persistent scheduling, SPS, configurations, each of the SPS configurations defining a plurality of periodic transmission opportunities for the wireless device, at least two of the two or more SPS configurations having different periods for the periodic transmission opportunities. The wireless device then transmits data corresponding to a first traffic type or a first radio bearer according to a first one of the two or more SPS configurations and transmitting data corresponding to a second traffic type or a second radio bearer according to a second one of the two or more SPS configurations.