PDCP Header Compression Retransmission During Handover
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Solution Overview
Problem
Conventional methods for data processing in mobile communication systems fail to prevent loss of data blocks during handover, especially when header decompression fails, leading to incorrect transmission status determination and potential data loss.
Innovation Solution
A method where a source base station transmits a first data block with a full header and compressed second data blocks to a target base station during handover, and retransmits both if the first data block is not correctly received, considering the status of header compression to ensure accurate transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If header compression is applied to data blocks during transmission, then transmission efficiency is improved, but header decompression may fail at the receiving side leading to data loss
Solution Approach 1:
The patent applies preliminary action by having the transmitting side predict which data blocks may fail header decompression before transmission completes. The transmitting PDCP layer uses RLC status reports to identify potentially failed blocks and proactively prepares for retransmission during handover, preventing data loss before it occurs.
Solution Approach 2:
The patent implements feedback by using RLC status reports from the receiving side to inform the transmitting PDCP layer about transmission status. This feedback mechanism allows the system to identify which compressed data blocks failed decompression and trigger appropriate retransmission actions during handover procedures.
2Device complexity
If retransmission is performed based only on RLC status report, then retransmission process is simplified, but data blocks with header decompression failure are not retransmitted causing data loss
Solution Approach 1:
The patent merges the functionality of the transmitting PDCP layer with header compression status monitoring. By combining RLC status report analysis with PDCP-level header decompression outcome assessment, the system achieves comprehensive data block tracking without significantly increasing overall system complexity.
3Reliability
If all data blocks are retransmitted during handover, then data completeness is ensured, but network resources are wasted on already correctly received blocks
Solution Approach 1:
The patent applies partial action by selectively retransmitting only those data blocks that are predicted to fail or have failed header decompression, rather than retransmitting all data blocks. This selective approach ensures data completeness while minimizing unnecessary network resource consumption during handover.
Data Source
AI summary
A data processing method for a mobile communication system is provided. In a method in which a source base station processes data in a mobile communication system, a first data block including a full header and at least one second data block on which header compression was performed based on the first data block are transmitted to a user equipment and the first data block and the at least one second data block are then forwarded to a target base station during a handover procedure when the first data block was not correctly received and one or more of the at least one second data block was correctly received by the user equipment.