Sidelink Feedback Power Allocation for Variable Link Conditions
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Solution Overview
Problem
Existing wireless communication technologies, such as NR and LTE, face challenges in optimizing power allocation for sidelink feedback transmissions, particularly in device-to-device and vehicle-to-vehicle communications, where varying link configurations, distances, and traffic priorities complicate efficient HARQ feedback signaling.
Innovation Solution
A method and apparatus for determining transmission power of feedback signals based on factors like distance, RSRP, traffic priority, transmission mode, and network indications, allowing for differentiated power allocation to prioritize important feedback signals and compensate for path loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If uniform power allocation is used for all feedback signals, then transmission complexity is reduced, but feedback reliability deteriorates due to inability to compensate for path loss in varying link conditions
Solution Approach 1:
The patent applies local quality by allocating different power levels to different feedback signals based on their specific link conditions. Each feedback signal's transmit power is determined by local factors such as path loss, distance, and link quality metrics, allowing each signal to be optimized for its specific transmission conditions rather than using a uniform power level for all signals.
Solution Approach 2:
The patent implements dynamics by making the power allocation adaptive and variable. The transmit power for each feedback signal is dynamically adjusted based on current link conditions, path loss measurements, and traffic priorities. This dynamic power allocation allows the system to respond to changing channel conditions and prioritize critical feedback signals when needed.
2Reliability
If differentiated power allocation is implemented for feedback signals, then feedback reliability is improved, but transmission power management complexity increases
Solution Approach 1:
The patent applies parameter changes by modifying the transmit power parameter based on various link conditions and feedback signal characteristics. The system changes power levels according to path loss measurements, distance metrics, link quality indicators, and traffic priority assignments, allowing flexible adaptation to different transmission scenarios while maintaining manageable complexity through standardized parameter adjustment rules.
3Reliability
If more power is allocated to feedback signals in poor link conditions, then communication reliability is improved, but overall energy consumption increases
Solution Approach 1:
The patent applies local quality by allocating transmission power locally based on specific link conditions rather than uniformly across all transmissions. Devices adjust power levels according to local factors such as path loss, distance to the transmitting device, and link quality metrics, ensuring that additional power is consumed only when and where it is actually needed to maintain reliable communication.
Solution Approach 2:
The patent implements dynamics through adaptive power allocation that responds to changing link conditions. The system dynamically adjusts transmit power based on real-time measurements of path loss, signal quality, and communication requirements, allowing energy consumption to vary with actual needs rather than maintaining a fixed high power level for all transmissions.
Data Source
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AI summary
Certain aspects of the present disclosure provide techniques for power allocation for sidelink feedback transmission. A method that may be performed by a user equipment (UE) include receiving one or more data transmissions from one or more other UEs, generating a feedback signal for each of one or more data transmissions, determining a transmission power of the feedback signal for each of one or more data transmissions based on at least one configuration associated with the feedback signal, and transmitting the feedback signal to each of the one or more other UEs using the determined transmission power.