ROHC Processing During Cell Handover to Prevent Packet Loss
Solution Overview
Problem
During cell handover in communication systems, the loss of user data packets occurs due to decompression failures in terminal devices when initial and refresh (IR) packets are discarded by the first access network device, leading to a failure in establishing the correspondence between context identifiers and compressed content.
Innovation Solution
The first access network device delays robust header compression (ROHC) processing until after determining which packets need to be discarded based on a packet data convergence protocol (PDCP) status report from the terminal device, ensuring IR packets are not mistakenly discarded, thereby maintaining the correspondence between context identifiers and compressed content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the first access network device performs ROHC processing on packets before determining which packets need to be discarded, then packet processing efficiency is improved, but IR packets may be mistakenly discarded causing decompression failure
Solution Approach 1:
The patent applies preliminary action by determining which packets need to be discarded before performing ROHC processing. The access network device first identifies packets marked for discarding based on PDCP status reports, then performs ROHC processing only on remaining packets. This ensures IR packets are protected from being discarded while maintaining processing efficiency.
Solution Approach 2:
The patent segments the packet processing into distinct phases: first determining packets to discard based on PDCP status, then performing ROHC processing on non-discarded packets. This segmentation prevents IR packets from being mistakenly discarded while maintaining efficient processing of other packets.
2Productivity
If the first access network device discards packets marked as successfully received, then data transmission efficiency is improved, but correspondence between context identifiers and compressed content cannot be established
Solution Approach 1:
The access network device performs preliminary determination of packets to discard before ROHC processing. By identifying packets marked for discarding in advance and excluding them from ROHC processing, the device ensures IR packets remain available to establish context identifier correspondence while still discarding redundant packets to improve transmission efficiency.
Solution Approach 2:
The patent applies local quality by treating different packets differently based on their type. IR packets are protected from discarding to maintain correspondence information, while other packets can be discarded to improve efficiency. This selective treatment ensures both efficiency and information integrity.
Data Source
AI summary
Embodiments of this application provide a data processing method, an access device, and a terminal device. The data communication method includes: A first access network device receives a handover request message from a second access network device, where the handover request message is to request a terminal device to hand over from a cell of the second access network device to a cell of the first access network device. The first access network device determines that robust header compression ROHC restriction processing needs to be performed. The data communication method further includes: The first access network device receives at least one packet from the second access network device and performs the ROHC restriction processing on a second packet in the at least one packet. The method can avoid a decompression failure of a terminal.