MBMS Data Error Correction via UTRAN Feedback
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Solution Overview
Problem
In conventional UMTS networks, providing multimedia broadcast and multicast services using point-to-multipoint radio bearers results in service quality degradation due to the inability to receive feedback from individual terminals, leading to incomplete or erroneous data reception, as there is no mechanism for error correction during point-to-multipoint transmissions.
Innovation Solution
The UTRAN stores data during an MBMS session and re-transmits specific data blocks identified as not received or erroneous after the session, using feedback from terminals to determine which data needs re-transmission, establishing either point-to-point or point-to-multipoint radio bearers for re-transmission based on the number of affected terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If point-to-multipoint radio bearers are used for MBMS service, then service coverage and efficiency are improved, but service quality and error correction capability deteriorate
Solution Approach 1:
The patent segments the data transmission process into two distinct phases: initial point-to-multipoint transmission for efficiency, and subsequent point-to-point re-transmission for reliability. The data is divided into original transmission and re-transmission portions, allowing the system to optimize for different goals at different stages.
Solution Approach 2:
The patent dynamically switches between point-to-multipoint and point-to-point transmission modes based on reception feedback. The system adapts its transmission strategy by determining which terminals need re-transmission and using appropriate bearer types accordingly, making the system flexible rather than static.
2Loss of energy
If point-to-multipoint transmission is used, then network resource utilization is improved, but error correction and feedback reception capability worsen
Solution Approach 1:
The patent introduces a feedback mechanism where terminals report reception status to the network. This feedback enables the network to identify which data blocks were not received correctly and triggers targeted re-transmissions, closing the loop between transmission and reception quality.
Solution Approach 2:
The patent performs preliminary data storage and analysis before re-transmission. The network stores the original data and prepares re-transmission plans in advance based on feedback, allowing efficient resource allocation for correction transmissions without wasting resources on unnecessary re-transmissions.
3Manufacturing precision
If re-transmission is performed after session stop, then data reception accuracy is improved, but service time and latency worsen
Solution Approach 1:
The patent applies partial re-transmission rather than complete re-transmission of all data. Only the specific data blocks that were not received correctly are re-transmitted, reducing the time overhead compared to re-transmitting the entire data set.
Solution Approach 2:
The patent uses the existing MBMS infrastructure and protocols for both the original transmission and the re-transmission phase. The same network elements, bearers, and procedures are utilized, avoiding the need for separate dedicated error correction systems that would add time overhead.
Data Source
AI summary
In order to guarantee service quality for a terminal for a particular point-to-multipoint service, a broadcast or multicast radio terminal system is characterized in that after the corresponding session is complete, information regarding the data that the terminal did not properly receive is informed to the UTRAN, and then the corresponding data is received upon re-transmission from the UTRAN.