UDC Buffer Error Recovery Using Serial-Numbered PDCP PDUs
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently resolving buffer errors in uplink data compression (UDC) without incurring significant latency or packet loss, particularly when sequence-based compression is used, as current solutions either result in packet loss or large latency penalties.
Innovation Solution
The proposed solution involves generating a second set of PDCP PDUs based on a serial number of a particular PDCP PDU identified with an error, where each PDCP PDU corresponds to a subset of PDCP SDUs with serial numbers equal to or greater than the error-indicated PDCP PDU, allowing for selective transmission to correct the buffer error without clearing the entire buffer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire UDC buffer is cleared to resolve a buffer error, then data integrity is restored, but latency increases significantly and packet loss occurs
Solution Approach 1:
The patent segments the buffer error resolution process by identifying and retransmitting only the specific PDCP PDU with the error (based on serial number) rather than clearing the entire buffer. This divides the resolution action into targeted segments, restoring data integrity for the erroneous segment while preserving valid data in other segments, thereby reducing latency and packet loss.
Solution Approach 2:
The patent extracts and isolates the erroneous PDCP PDU from the buffer using serial number identification. By taking out only the problematic segment (the specific PDCP PDU with the error) rather than removing the entire buffer contents, the system restores data integrity while minimizing latency and packet loss associated with buffer clearing.
2Loss of time
If selective retransmission is implemented to reduce latency, then packet loss decreases, but device complexity increases
Solution Approach 1:
The patent implements feedback mechanisms where the receiving device detects buffer errors and sends error indications (including serial numbers of erroneous PDCP PDUs) back to the transmitting device. This feedback enables selective retransmission of only the problematic segments, reducing latency and packet loss while the feedback loop manages the increased complexity of buffer error tracking and resolution.
3Productivity
If sequence-based compression is used to improve data efficiency, then bandwidth utilization increases, but buffer error resolution becomes more difficult
Solution Approach 1:
The patent applies preliminary action by embedding serial numbers in PDCP PDUs before transmission. These serial numbers serve as pre-prepared identifiers that enable quick identification and selective retransmission of erroneous packets during buffer error resolution. This preliminary tagging simplifies the resolution process while maintaining the benefits of sequence-based compression for bandwidth utilization.
Data Source
AI summary
This disclosure provides systems, methods, and devices for wireless communication that supports buffer error resolution operations. In a first aspect, a device transmits first PDUs, each PDU corresponding to a respective SDU of first SDUs; receives a buffer error indication and an indication of a serial number of a particular PDU processed by another device, the first PDUs include the particular PDU; generates second PDUs, wherein each PDU of the second PDUs corresponds to a respective SDU of second SDUs, wherein each PDU of the second PDUs is a respective compressed PDU corresponding to a respective PDU of a subset of PDUs of the first PDUs which are associated with a respective serial number equal to or greater than the serial number of the particular PDU; and transmits the second PDUs to the second network node. Other aspects and features are also claimed and described.