PDCP Status Report FMS Count for Wireless Retransmission
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Solution Overview
Problem
The existing PDCP status report in wireless communication systems is insufficient to support high-speed communication, as it lacks sufficient information to accurately indicate non-received service data units (SDUs), leading to inefficiencies in data retransmission and buffer management.
Innovation Solution
A method is introduced to enhance the PDCP status report by including a First Missing Sequence Number (FMS) count value and a bitmap, which indicates the count of first non-received SDUs and their status, allowing for accurate identification of missing or correctly received SDUs, thereby facilitating efficient retransmissions without altering the SDU size or report structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the existing PDCP status report structure is used, then the report structure remains simple and implementation is easier, but the information provided is insufficient to support high-speed communication and accurately identify non-received SDUs
Solution Approach 1:
The status report is segmented into multiple functional fields: FMS COUNT field for indicating the first non-received SDU, and bitmap field for indicating the reception status of subsequent SDUs. This segmentation allows comprehensive status information to be conveyed without requiring a complete redesign of the entire report structure.
Solution Approach 2:
The invention extracts the critical status information (first non-received SDU count and bitmap) from the complex reception buffer status and presents it in a structured, compact format. This extraction approach provides sufficient information for high-speed communication while maintaining a relatively simple report structure that can be implemented with minimal modifications to existing systems.
2Productivity
If more detailed status information is included to support high-speed communication, then communication efficiency improves, but the size and complexity of the status report increases
Solution Approach 1:
Instead of providing detailed status for all SDUs uniformly, the invention uses local quality by applying different representation methods: FMS COUNT for the first non-received SDU and bitmap for subsequent SDUs. This localized approach provides necessary detail where needed while keeping the overall structure compact and efficient for high-speed communication.
3Measurement precision
If the PDCP status report includes comprehensive information about all non-received SDUs, then retransmission accuracy improves, but the transmission overhead and processing complexity increase
Solution Approach 1:
The status report uses asymmetric representation where the FMS COUNT field provides precise identification of the first non-received SDU, while the bitmap provides compact status indication for subsequent SDUs. This asymmetric approach achieves high identification accuracy without requiring equal detail for all SDUs, thus minimizing the overall data volume of the status report.
Data Source
AI summary
There is provided a method for transferring a status report in a wireless communication system, the method comprising: configuring a Packet Data Convergence Protocol (PDCP) status report used by a PDCP layer located above a Radio Link Control (RLC) layer, the PDCP status report including an indicator indicating a count value of a first non-received service data unit (SDU); and transferring the configured PDCP status report to a lower layer. The indicator may be first missing sequence number count (FMS COUNT) value which contains the count value of the first non-received PDCP SDU.