Radio Network Frame Loss Threshold Mechanism
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Solution Overview
Problem
Current broadcasting systems face challenges in maintaining satisfactory quality of service for multimedia content transmission to mobile devices due to signal fading, which conventional channel coding techniques struggle to fully mitigate, especially in the absence of an effective uplink communication channel for retransmissions.
Innovation Solution
A method for transmitting data in a radiocommunication network where each frame comprises a data section and redundancy information associated with previous frames, allowing for comparison of consecutive frame losses against a threshold; if the loss exceeds this threshold, a request for retransmission is sent to the network infrastructure, optimizing error correction and user experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional channel coding techniques are used to protect against transmission errors, then some error correction capability is provided, but the quality of service degrades under fading conditions and cannot fully mitigate signal degradation
Solution Approach 1:
The system performs preliminary error correction using FEC on received frames before attempting retransmission. The threshold mechanism pre-establishes when retransmission requests should be triggered, enabling proactive error management rather than reactive correction only after failure
Solution Approach 2:
The system implements a feedback loop where the mobile station monitors frame loss, compares consecutive lost frames against a threshold, and sends retransmission requests (NACK) to the broadcasting infrastructure when the threshold is exceeded. This closed-loop feedback enables dynamic adaptation to channel conditions
2Reliability
If retransmission requests are sent for every lost frame, then complete error correction is achieved, but real-time constraints and user experience are compromised due to delays
Solution Approach 1:
Instead of requesting retransmission for every single lost frame, the system applies partial action by only triggering retransmission requests when the number of consecutive lost frames exceeds a predetermined threshold. This selective approach corrects the most critical errors while avoiding excessive retransmission overhead
Solution Approach 2:
The system dynamically adjusts the threshold parameter based on channel conditions and service requirements. By changing the threshold parameter, the system can adapt between being more aggressive (lower threshold) or more conservative (higher threshold) in requesting retransmissions, optimizing the balance between reliability and latency
3Reliability
If broadcasting systems provide robust error correction, then data reliability improves, but the absence of an effective uplink channel prevents effective retransmission requests
Solution Approach 1:
The system makes the mobile station multi-functional by enabling it to both receive broadcast transmissions and send uplink retransmission requests through available return channels. The mobile station universally handles both downlink reception and uplink feedback functions that were traditionally separate
Solution Approach 2:
The patent uses available return channels (such as enhanced dedicated physical channels in UMTS or packet data channels) as intermediaries to carry retransmission requests from the mobile station back to the broadcasting infrastructure, bridging the gap between unidirectional broadcasting and bidirectional communication needs
Data Source
AI summary
In user equipment to which an infrastructure of a radiocommunication network transmits data carried by a sequence of frames broadcast to the user equipment, each frame comprising a first section containing data and a second section containing redundancy information associated with the data of the B previous frames in the sequence, a number of consecutive lost frames is compared with a threshold dependent on the number B of previous frames with which said redundancy information is associated and the parameters of the encoding generating said redundancy information, and a request for retransmission of at least one out of the consecutive lost frames is sent to the radiocommunication network infrastructure if the number B of consecutive lost frames exceeds said threshold.