Wireless Status Reporting Using NACK Segment Offsets
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Solution Overview
Problem
In wireless communication systems, the existing status report mechanisms for RLC protocols face inefficiencies in reporting lost segments of service data units, particularly when segments are not distinguishable by sequence numbers, leading to increased status report size and overhead.
Innovation Solution
A status report message that includes a negative acknowledgement (NACK) sequence number field and multiple sets of segment offset fields related to the NACK SN field, allowing for efficient reporting of lost segments without requiring distinct sequence numbers for each segment, thereby reducing the report size and overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sets of segment offset fields are reported for different sequence numbers, then each lost segment can be individually identified, but the status report size and overhead increase
Solution Approach 1:
The patent merges multiple segment offset fields into a single sequence number field by encoding the segment information within the sequence number itself. Instead of using separate fields for each segment offset, the invention combines the segment identification with the sequence number, allowing multiple segments to be represented in a compact format that reduces overall message size while maintaining the ability to identify each lost segment individually.
2Manufacturing precision
If status reports include detailed segment offset information for each lost segment, then retransmission accuracy improves, but message complexity increases
Solution Approach 1:
The patent changes the parameter representation by encoding segment offset information directly within the sequence number field rather than using separate parameters. This parameter transformation allows the system to maintain precise segment identification capability while simplifying the overall message structure, as the segment information is now embedded in a single field rather than requiring multiple independent parameters.
Data Source
AI summary
Radio equipment (12, 14) is configured for use in a wireless communication system (10). The radio equipment (12, 14) transmits or receives a status report message (18) that includes a negative acknowledgement, NACK, sequence number, SN, field (20) and multiple different sets of segment offset, SO, fields (22-1, . . . 22-N) related to the NACK SN field (20). The different sets of SO fields (22-1, . . . 22-N) may for instance indicate different respective service data unit, SDU, portions that have been detected as lost. These different respective SDU portions may be portions of the same SDU with a SN indicated by the NACK SN field (20).