NR RLC Status Report NACK Range Segmentation
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Solution Overview
Problem
The lack of concatenation support in the New Radio (NR) Radio Link Control (RLC) layer leads to increased RLC packet data units being mapped to a single transport block, resulting in inefficient error correction and status reporting, as opposed to LTE which supports concatenation, causing inaccuracies in segment tracking and increased network overhead.
Innovation Solution
Enhancing the RLC status report by including a negative acknowledgement sequence number range and optionally a segment offset, allowing for more precise reporting of missing segments and reducing overhead by using a NACK_SN_range field, which indicates consecutive missing sequence numbers and their end value, thereby optimizing the status report format.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If NR RLC layer does not support concatenation of RLC SDUs, then segmentation is simplified and processing is easier, but many RLC PDUs from a single RLC entity are mapped to a single transport block causing inefficient error correction and increased loss propagation
Solution Approach 1:
The patent applies segmentation by dividing the RLC PDUs into segments with unique sequence numbers and segment offsets. Each segment is independently tracked and reported, allowing the receiver to identify which segments were successfully received and which need retransmission. This segmentation approach maintains the simplicity of NR RLC while enabling efficient error correction by treating segments as independent units.
2Device complexity
If NR RLC layer does not support concatenation of RLC SDUs, then processing complexity is reduced, but one lost transport block amounts to many RLC PDUs lost increasing overhead
Solution Approach 1:
By segmenting RLC PDUs and assigning unique sequence numbers and segment offsets to each segment, the patent enables selective retransmission of only the lost segments rather than requiring retransmission of entire RLC PDUs. This reduces the propagation of loss through the system while maintaining processing simplicity.
Solution Approach 2:
The patent implements feedback mechanisms through status reports that indicate which segments were successfully received and which need retransmission. The receiver sends feedback information about segment reception status, allowing the transmitter to efficiently manage retransmissions and reduce unnecessary overhead.
3Measurement precision
If LTE RLC uses framing information based initial segmentation with different SNs for SDU segments, then segment tracking is accurate, but status report overhead is increased
Solution Approach 1:
The patent segments RLC PDUs and assigns unique sequence numbers and segment offsets to each segment, enabling accurate tracking of segment reception status. This segmentation approach provides precise measurement of which segments were successfully received while managing overhead efficiently.
Solution Approach 2:
The patent changes the parameters used for segment identification by introducing segment offsets in addition to sequence numbers. This allows for more efficient status reporting by using a combination of sequence number and offset to uniquely identify segments, reducing the overhead required for accurate tracking.
Data Source
AI summary
Various communication systems may benefit from an enhanced radio link control status report. A method may include determining a negative acknowledgment sequence number range. The negative acknowledgment sequence number range may include a plurality of consecutive radio link control missing sequence numbers. The method may also include determining at least one of a negative acknowledgment end sequence number when the plurality of consecutive radio link control missing sequence numbers exceeds the negative acknowledgment sequence number range. In addition, the method may include sending a radio link control status report comprising at least one of a negative acknowledgment sequence number, the negative acknowledgment sequence number range, or the negative acknowledgment end sequence number when the plurality of consecutive radio link control missing sequence numbers exceeds the at least one negative acknowledgment sequence number range.