Sidelink Power Control for Uplink Interference in Shared Resources
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Solution Overview
Problem
In wireless communication systems, the overlap of sidelink and uplink resources leads to interference, undermining efficient resource utilization and battery life, as sidelink transmissions can adversely affect uplink communications.
Innovation Solution
Implement power control signaling to manage sidelink transmissions, using the lower of the indicated power level in power control signaling or the power level used for resource reservation, ensuring sidelink transmissions do not exceed a certain threshold to avoid interference with uplink transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sidelink transmissions use high power levels to ensure reliable communication, then transmission reliability is improved, but interference with uplink communications increases
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the power level of sidelink transmissions based on detected uplink signal characteristics. The UE measures the power level of received uplink transmissions and accordingly selects an appropriate power level for its own sidelink transmissions, ensuring reliability while preventing harmful interference.
Solution Approach 2:
The patent implements feedback mechanisms where the UE continuously monitors the power levels of uplink transmissions from other UEs and uses this information to adapt its sidelink transmission power. This feedback loop enables the system to maintain reliable sidelink communication while automatically preventing interference with uplink communications.
2Productivity
If sidelink and uplink resources overlap to improve resource utilization, then resource efficiency is improved, but interference between transmissions increases
Solution Approach 1:
The patent applies local quality by enabling sidelink and uplink transmissions to coexist on overlapping resources through localized power control. Instead of separating resources entirely, the system allows overlap but applies specific power level constraints to sidelink transmissions in the affected local areas (frequency-time resources) to prevent interference.
3Object-generated harmful factors
If power control signaling is implemented to manage sidelink transmissions, then interference is reduced, but device complexity increases
Solution Approach 1:
The patent implements self-service by enabling UEs to autonomously perform power control for sidelink transmissions without requiring complex network coordination. Each UE independently detects uplink power levels and adjusts its own sidelink power accordingly, reducing the need for complex device complexity while still managing interference effectively.
Data Source
AI summary
Certain aspects of the present disclosure provide techniques for wireless communications by a user equipment. An example method generally includes transmitting, on a sidelink channel using a first power level, a reservation of a resource for a sidelink transmission by the UE; determining to use a second power level for the reserved resource for the sidelink transmission; and transmitting on the sidelink channel on the reserved resource using the second power level.