User Terminal Feedback Control for Multicast Resource Bottlenecks
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Solution Overview
Problem
In mobile communication systems, multicast/broadcast transmission faces challenges in efficiently managing feedback information across multiple user terminals, leading to complex feedback control and potential radio resource bottlenecks, especially when integrating feedback mechanisms into unicast transmission scenarios.
Innovation Solution
The implementation of a user terminal and base station configuration that selectively transmits feedback information based on radio state thresholds, suspends feedback when conditions are favorable, and allocates specific uplink radio resources for feedback, allowing efficient resource management and reducing unnecessary transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If feedback information is transmitted by all user terminals in multicast/broadcast transmission, then the base station can control transmission effectively, but uplink radio resources are wasted due to redundant feedback from terminals with good radio states
Solution Approach 1:
The patent applies local quality by differentiating feedback transmission behavior based on individual terminal characteristics (radio state). Terminals with poor radio states transmit feedback information, while terminals with good radio states suspend transmission. This selective approach optimizes resource usage by tailoring feedback behavior to local conditions at each terminal rather than applying a uniform feedback policy to all terminals.
2Loss of energy
If feedback information is suspended by all user terminals, then uplink radio resources are conserved, but the base station loses control over transmission quality
Solution Approach 1:
The patent implements dynamics by making feedback transmission behavior adaptable and changeable based on terminal radio states. The system dynamically adjusts which terminals transmit feedback and which suspend transmission, allowing the feedback mechanism to respond to changing channel conditions. This dynamic approach maintains control effectiveness while optimizing resource usage under varying conditions.
3Reliability
If uplink radio resources are allocated to all user terminals for feedback transmission, then feedback control is comprehensive, but resource bottlenecks occur in multicast/broadcast scenarios
Solution Approach 1:
The patent applies the extraction principle by removing unnecessary feedback transmission from terminals with good radio states. Instead of allocating resources to all terminals, the system extracts and eliminates redundant feedback transmissions, keeping only the essential feedback from terminals that actually need to transmit (those with poor radio states). This reduces resource allocation complexity and eliminates waste.
4Loss of energy
If selective feedback transmission is implemented based on radio state thresholds, then resource efficiency improves, but feedback control becomes more complex
Solution Approach 1:
The patent uses parameter changes by introducing radio state thresholds as a control parameter for determining feedback transmission behavior. The base station configures threshold values that terminals compare against their measured radio states to decide whether to transmit or suspend feedback. This parameter-based control mechanism provides a systematic and manageable way to implement selective feedback, balancing resource efficiency with control complexity.
Data Source
AI summary
A user terminal includes: a receiver configured to receive multicast/broadcast data transmitted from a base station to a plurality of user terminals using the same downlink radio resources; a controller configured to select uplink radio resources to be used for transmission of feedback information, from a resource pool allocated from the base station to a group including the plurality of user terminals; and a transmitter configured to transmit the feedback information to the base station using the selected uplink radio resources.