Sidelink Transmission Prioritization for V2X Congestion Control
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Solution Overview
Problem
In LTE-based V2X communications, there is a challenge in effectively implementing congestion control to prevent radio channel congestion from too many transmissions within a geographical area, particularly due to the violation of minimum Toff limits and duty cycle constraints, which can lead to regulatory non-compliance and impact on higher priority data transmissions.
Innovation Solution
A prioritization scheme is implemented where data transmissions are given higher priority over signaling transmissions, allowing the wireless communication device to skip or reschedule signaling transmissions such as Sidelink Synchronization Signals (SLSS) and Physical Sidelink Broadcast Channel (PSBCH) if they violate the Toff or duty cycle limits, ensuring compliance with regulatory requirements while minimizing the impact on data packet transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signaling transmissions (SLSS/PSBCH) are performed according to periodic timing requirements, then synchronization and broadcast functions are maintained, but Toff limits and duty cycle constraints may be violated causing regulatory non-compliance
Solution Approach 1:
The patent implements dynamic prioritization where the relative importance of signaling transmissions versus data transmissions is adjusted based on real-time conditions. When data transmissions are identified as higher priority, the system dynamically changes the behavior of periodic signaling transmissions by skipping or delaying them to avoid Toff limit violations, thus adapting the system behavior to current operational requirements while maintaining regulatory compliance
Solution Approach 2:
The system changes the timing parameters of signaling transmissions dynamically. Instead of strictly adhering to fixed periodic timing, the system adjusts transmission timing by skipping certain signaling transmissions when they would violate Toff limits or duty cycle constraints. This parameter change allows the system to meet regulatory requirements while prioritizing data transmissions
2Productivity
If multiple transmissions are scheduled without priority differentiation, then channel utilization is maximized, but higher priority data transmissions may be impacted by congestion control violations
Solution Approach 1:
The patent segments transmissions into different priority categories (data transmissions and signaling transmissions) and applies different scheduling rules to each segment. By differentiating between transmission types and assigning priority levels, the system can optimize channel utilization for high-priority data while ensuring that lower-priority signaling transmissions do not interfere with congestion control requirements
Solution Approach 2:
The system implements feedback mechanisms to monitor transmission timing and detect potential Toff limit violations. When a violation is detected or predicted, the system responds by adjusting the scheduling of subsequent transmissions, prioritizing data transmissions and skipping or rescheduling signaling transmissions to maintain both channel utilization and data transmission reliability
3Object-affected harmful factors
If Toff limits are strictly enforced for all transmissions, then regulatory compliance is achieved, but periodic signaling transmissions may be disrupted
Solution Approach 1:
Instead of treating all transmissions equally and enforcing Toff limits uniformly, the patent inverts the approach by allowing flexibility in signaling transmission timing when necessary. The system prioritizes data transmissions and permits signaling transmissions to be skipped or delayed, thus inverting the traditional priority structure to achieve both regulatory compliance and signaling functionality
Solution Approach 2:
The system treats periodic signaling transmissions as disposable or replaceable when they conflict with higher-priority data transmissions or Toff limit requirements. By skipping certain signaling transmissions rather than enforcing strict periodicity, the system maintains regulatory compliance while accepting that individual signaling transmissions may be lost, relying on the periodic nature to recover functionality
Data Source
AI summary
According to some embodiments of inventive concepts, a method may be provided to operate a UE providing sidelink communications with other wireless devices. The method may include scheduling a first transmission from the UE, wherein the first transmission has a first priority. The method may also include scheduling a second transmission from the UE, wherein the second transmission has a second priority, wherein the first priority is greater than the second priority, and wherein the first and second transmissions are scheduled for transmission during a time interval. The method may further include transmitting the first transmission during the time interval, and responsive to determining a violation of a timing limit corresponding to scheduling the first and second transmissions during the time interval and responsive to the first priority being greater than the second priority, dropping transmitting the second transmission during the time interval.