Radio Terminal Processing Device for Measurement Feedback
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Solution Overview
Problem
In radio communication networks, especially in point-to-multipoint mode, radio terminals cannot feedback measurement data effectively to the network due to the unidirectional nature of the point-to-multipoint transport channel, leading to suboptimal modulation and encoding scheme adaptations, which can result in data loss even under good radio conditions.
Innovation Solution
A processing device in the radio terminal generates status messages representing radio conditions and transmits them on an authorized random access channel, allowing the network to adapt modulation and encoding schemes based on actual conditions, using reserved time/frequency/code domains to manage congestion and synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If point-to-multipoint transport channel is used for broadcasting content, then bandwidth efficiency is improved, but measurement feedback capability deteriorates
Solution Approach 1:
The patent segments the feedback mechanism by introducing a separate random access channel specifically dedicated to measurement feedback, independent from the point-to-multipoint broadcast channel. This allows measurement reports to be transmitted separately from content delivery, resolving the contradiction between bandwidth efficiency and feedback capability
Solution Approach 2:
The patent introduces an intermediary random access channel that mediates between the unidirectional broadcast channel and the network. This intermediary channel enables measurement feedback without requiring bidirectional capability on the original broadcast channel, maintaining bandwidth efficiency while enabling feedback
2Loss of information
If random access channel is used for measurement feedback, then measurement reporting capability is improved, but channel congestion worsens
Solution Approach 1:
The patent implements periodic random access opportunities specifically allocated for measurement feedback. Terminals transmit measurements at predetermined intervals rather than continuously, which reduces channel congestion while maintaining effective measurement reporting capability
Solution Approach 2:
The patent dynamically adjusts the random access channel allocation based on network conditions and terminal states. The system can activate or deactivate specific random access resources depending on whether measurement feedback is needed, optimizing channel utilization and reducing congestion
Data Source
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AI summary
A processing device (D) acts in respect of at least one radio terminal (UE) capable, on the one hand, of receiving data broadcast by a radio communication network in point-to-multipoint mode on a physical broadcasting channel and according to an adaptable modulation and encoding scheme, and on the other hand, of determining measurements representative of the radio conditions prevailing in at least the cell in which it is situated. This device (D) comprises processing means (MT) responsible: i) for determining whether a measurement performed by at least one radio terminal (UE) corresponds to a state from among a set of predefined states, and ii) if so, for generating a message dedicated to the state determined and for ordering the radio terminal (UE) to transmit this state message to the radio network in a portion of the domain which is time/frequency/code reserved for it within a signalling frame, for at least the cell considered.