Multicast Downlink Power Control via Dedicated Uplink Feedback
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Solution Overview
Problem
Current solutions for multimedia broadcasting in 3G mobile networks, such as the 3GPP standard, are inefficient in terms of power control and require significant changes to existing user equipment and network infrastructure, leading to suboptimal use of resources and limited scalability for multicasting services.
Innovation Solution
A method is proposed where a common downlink channel is set up for multiple users, with dedicated uplink channels for each user, enabling closed-loop power control to adjust transmission powers based on quality indications received from user equipment, thereby optimizing power usage and reducing the complexity of user equipment changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If point-to-point mode is used for content transmission to multiple users, then each user can receive personalized service, but radio resources are allocated inefficiently and resource utilization is low
Solution Approach 1:
The patent segments the transmission system into two distinct parts: a common downlink channel for multicast content delivery to multiple users, and dedicated uplink channels for each user to send quality indications. This segmentation allows efficient resource sharing on the downlink while maintaining individual user feedback capabilities on the uplink, resolving the contradiction between resource efficiency and system complexity.
Solution Approach 2:
The patent merges multiple point-to-point downlink transmissions into a single common downlink channel that serves multiple users simultaneously. This combining approach enables efficient resource utilization by transmitting content once instead of multiple times, while the system maintains simplicity through a unified channel structure rather than requiring complex multi-channel management.
2Loss of energy
If multicast/broadcast mode is implemented in 3G networks, then radio resources are saved, but significant changes to user equipment and network infrastructure are required
Solution Approach 1:
The patent makes the common downlink channel universal by designing it to handle both multicast content transmission and the aggregation of quality indication signals from multiple users. This multi-functionality approach allows the same channel infrastructure to serve multiple purposes, reducing the need for separate dedicated channels and minimizing equipment modification complexity while achieving efficient resource utilization.
Solution Approach 2:
The patent introduces a feedback mechanism where users transmit quality indications on dedicated uplink channels to the network. This feedback loop enables the network to dynamically adjust transmission parameters and optimize resource allocation based on actual user experience, achieving efficient resource consumption without requiring complex pre-configured systems, as the feedback drives adaptive management.
3Use of energy by moving object
If closed-loop power control is applied to common downlink channel, then transmission power is optimized, but power control mechanism becomes more complex
Solution Approach 1:
The patent implements self-service power control where the common downlink channel automatically adjusts its transmission power based on quality indications received from users via uplink channels. The system monitors its own performance through user feedback and autonomously optimizes power levels without requiring external intervention or complex manual configuration, achieving efficient energy use while keeping the control mechanism relatively simple through automated feedback-driven adjustment.
Data Source
AI summary
A method of distributing information content to at least two user equipments includes: setting up a common downlink channel common to the at least two user equipments; setting up at least two uplink channels, each uplink channel being dedicated to a respective one of the at least two user equipments; delivering the information content to the at least two user equipments over the common downlink channel; and controlling transmission powers related to the common downlink channel and the at least two uplink channels in a closed-loop fashion. The closed-loop fashion power control includes: receiving from the at least two user equipments common downlink channel quality indications over the respective dedicated uplink channels; adjusting a transmission power in respect to the common downlink channel based on the common downlink channel quality indications received from the user equipments; evaluating a channel quality with respect to each of the at least two dedicated uplink channels; and based on the evaluation, sending to the at least two user equipments a transmission power control command over the common downlink channel.