RLC AM Receiver State Variable Adjustment for Redundant Retransmission Elimination
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Solution Overview
Problem
Existing 3GPP protocols for RLC AM data reception lead to redundant retransmissions due to the status report triggering unnecessary retransmissions of segments that have not been transmitted or are currently in transit, wasting resources in high-speed 5G data transmission scenarios.
Innovation Solution
Adjusting the state variable RX_Next_Status_Trigger to exclude the status of the last SDU in the status report, ensuring that only missing segments are retransmitted by setting it to one less than RX_Next_Highest when the first byte segment or a contiguous set is received, and resetting it to RX_Next_Highest when non-contiguous segments are received, thereby preventing redundant retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the status report includes the status of all received SDUs according to existing 3GPP protocols, then the protocol implementation is straightforward and complete, but redundant retransmissions occur for segments that have not been transmitted or are currently in transit
Solution Approach 1:
The patent extracts the problematic SDU (the last received SDU) from the status report to prevent redundant retransmissions. By excluding this specific SDU from the status report when certain conditions are met (contiguous reception starting from the first byte segment), the system avoids triggering unnecessary retransmissions for segments that are either not yet transmitted or currently in transit, thus reducing resource waste while maintaining protocol reliability for actually lost segments
Solution Approach 2:
The patent introduces dynamic adjustment of the status report content based on reception conditions. The decision to include or exclude the last SDU from the status report is not static but depends on whether the received segments form a contiguous set starting from the first byte segment. This dynamic approach allows the system to adapt the status report to actual transmission state, preventing redundant retransmissions when appropriate while maintaining complete status reporting when needed
2Reliability
If the status report triggers retransmission for all missing segments, then data integrity is ensured, but transmission efficiency decreases due to redundant retransmissions in high-speed 5G scenarios
Solution Approach 1:
The patent removes the last received SDU from the status report under specific conditions (when segments are contiguous and start from the first byte segment), preventing the status report from triggering redundant retransmissions. This extraction maintains data integrity for actually lost segments while eliminating unnecessary retransmission triggers, thereby improving transmission efficiency in high-speed 5G scenarios without compromising reliability
Solution Approach 2:
The patent changes the parameter of status report content based on reception patterns. When the received segments form a contiguous set starting from the first byte segment, the status report excludes the last SDU; otherwise, it includes all missing segments. This parameter change optimizes the balance between data integrity and transmission efficiency by adapting the status report to actual transmission conditions
Data Source
AI summary
Described are methods, systems and devices for eliminating redundant retransmissions in radio link layer (RLC) acknowledged mode (AM) data transmissions and receptions. In some embodiments, when an RLC service data unit (SDU) has not been completely received, the value of a state variable may be selectively set based on whether or not a contiguous set of byte segments of the RLC SDU have been received. This prevents the retransmission of byte segments that are either currently being transmitted or have not yet been transmitted. In other embodiments, the selective setting of the state variable may be triggered by the expiration of a reassembly timer. The described implementations may improve the data transmission of RLC SDUs in high data rate scenarios, which may be ubiquitous in 5G implementations.