Power Control for Shared Feedback in Multicast Wireless Systems
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Solution Overview
Problem
In wireless communications, shared feedback resources in multicast systems often lead to interference and reduced signal quality due to undistinguishable feedback from multiple UEs, making it difficult for base stations to determine which UEs have decoding failures and requiring improved power control techniques to enhance feedback message reliability.
Innovation Solution
Implementing power control configurations that include weighting factors, channel quality thresholds, and probability factors for UEs to determine whether to transmit feedback messages, adjusting transmit power based on pathloss and channel conditions, and using shared uplink control resources to reduce interference and improve feedback reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shared resources are used for feedback transmission to reduce signaling overhead, then resource efficiency is improved, but feedback signal quality deteriorates due to interference and collision between multiple UEs
Solution Approach 1:
The patent applies local quality by configuring different power control parameters for different UEs based on their individual channel conditions. Each UE receives customized power control configurations including pathloss reference signals and weighting factors tailored to its specific location and channel characteristics, enabling differentiated power adjustment rather than uniform power control across all UEs using shared resources
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting power control parameters such as pathloss reference signal power, weighting factors, and threshold values based on channel conditions. The base station modifies these parameters in response to changing channel states, allowing the system to adapt power levels to maintain signal quality while using shared resources
2Reliability
If transmit power is increased for UEs with high pathloss to improve feedback reception, then feedback reliability is improved, but overall power consumption increases
Solution Approach 1:
The patent applies partial action by implementing selective power boosting only for UEs that experience decoding failures and require retransmission. Not all UEs continuously transmit at high power - only those with actual feedback needs and poor channel conditions increase power temporarily, avoiding unnecessary power consumption for UEs with good channel conditions or successful decoding
Solution Approach 2:
The patent uses feedback mechanisms where UEs report channel quality indicators and decoding status to the base station. The base station uses this feedback to determine which UEs need power adjustment, creating a closed-loop system that optimizes power consumption based on actual communication needs rather than uniform high power transmission
3Reliability
If power control parameters are configured for each UE to improve feedback reliability, then signal quality is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a common power control formula structure and shared reference signals for all UEs. While individual parameters are customized, the overall power control mechanism and mathematical framework remain uniform across all UEs, allowing the system to maintain complexity through standardization while achieving differentiated performance through parameter instantiation
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A base station may communicate with a user equipment (UE) or multiple UEs using multicast transmissions, and each of the multiple UEs may use shared resources to transmit feedback. A UE may receive a power control configuration associated with multicast communications and indicating one or more control parameters or weighting factors for uplink feedback. The UE may monitor a set of downlink resources for the multicast message from the base station, and may determine a decoding failure for the multicast message. The UE may determine whether to transmit uplink feedback to the base station based on the received power control parameters, such as adjusting UE transmit power using a weighting factor or other power control parameters. The UE may determine whether to transmit the uplink feedback message indicating the decoding failure based on the power control configuration.