MTCH Uplink Feedback Selection Using CQI Thresholds
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Solution Overview
Problem
In wireless communication systems, determining when user equipment (UE) should perform uplink feedback for multicast traffic channel (MTCH) transmission is challenging due to issues such as the lack of hybrid automatic repeat request acknowledgement/negative-acknowledgment (HARQ-ACK/NACK) information, complex uplink feedback mechanisms, and the need for significant resources, which can affect system performance.
Innovation Solution
The method involves determining UE to perform MBMS uplink feedback based on channel quality indicators (CQI), uplink feedback conditions, or signaling parameters, reducing the number of UEs participating in feedback by only requiring those with poor reception quality to send feedback, thus optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If all UEs participate in uplink feedback for MTCH transmission, then feedback reliability is improved, but resource consumption and system complexity increase significantly
Solution Approach 1:
The patent segments the UE population into different feedback participation groups based on CQI thresholds. Only UEs with CQI below a predetermined threshold are required to provide uplink feedback, while UEs with good reception quality (CQI above threshold) are exempt. This segmentation resolves the contradiction by maintaining sufficient feedback reliability from the struggling UEs while dramatically reducing the quantity of feedback transmissions from the entire UE population.
Solution Approach 2:
The patent applies local quality by making feedback participation conditional on individual UE reception quality. Each UE's feedback obligation is localized to its specific channel conditions - only UEs experiencing poor reception (low CQI) are required to feedback. This resolves the contradiction by concentrating feedback resources where they are most needed (at the local level of poor receivers) rather than requiring universal participation.
2Measurement precision
If a complex uplink feedback mechanism is implemented for MTCH, then feedback accuracy is improved, but device complexity and implementation difficulty increase
Solution Approach 1:
The patent changes the parameter of feedback participation from a binary all-or-nothing approach to a threshold-based selective approach. By introducing CQI as a decision parameter and setting a predetermined threshold, the system achieves accurate feedback from the right subset of UEs without requiring complex feedback processing mechanisms. The complexity is reduced by using a simple threshold comparison rather than complex feedback scheduling and management.
Solution Approach 2:
The patent extracts the feedback requirement from the universal UE set and applies it only to the specific subset of UEs with poor reception quality. By taking out the feedback obligation from UEs with good reception (who don't need it) and applying it only to UEs with poor reception (who need it), the system achieves necessary feedback accuracy while significantly reducing the complexity of managing feedback from all UEs.
3Productivity
If selective feedback based on CQI threshold is implemented, then resource efficiency is improved, but feedback coverage may be reduced
Solution Approach 1:
The patent uses feedback about UE reception quality (CQI measurements) to make intelligent decisions about which UEs should participate in uplink feedback. This feedback loop ensures that only UEs who actually need to provide feedback (those with poor reception) are selected, maintaining effective feedback coverage while improving resource efficiency. The system feedbacks on channel conditions to determine appropriate feedback participation.
Solution Approach 2:
Each UE autonomously determines its own feedback participation status by comparing its measured CQI against the predetermined threshold, without requiring complex network scheduling or assignment. This self-service approach maintains feedback coverage for all UEs that need it (those below threshold) while dramatically improving resource efficiency by eliminating the need for centralized feedback management and reducing unnecessary feedback transmissions from UEs with good reception.
Data Source
AI summary
The present disclosure describes methods, system, and devices for determining a user equipment (UE) to perform multimedia broadcast multicast (MBMS) uplink feedback. The method includes receiving, by at least one UE, a multicast traffic channel (MTCH) transmission in a MBMS service from a radio access network (RAN). The method further includes, in response to determining that a channel quality indicator (CQI) of the UE satisfies a preset condition, determining, by the UE, to perform MBMS uplink feedback.