5G Handover Interruption Reduction via UE Packet Reordering
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Solution Overview
Problem
Current 5G wireless communication systems face interruptions during handover processes due to packet duplication and out-of-sequence delivery issues, which affect the performance of robust header compression and integrity verification.
Innovation Solution
Implementing a system where user equipment (UE) performs sequence number-based reordering and packet duplication detection after robust header compression, and maintains simultaneous connectivity with both source and target cells to minimize interruptions, using separate or common buffers for reordering and decompression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If packet duplication and out-of-sequence delivery issues are not addressed during handover, then handover interruptions occur, but implementing complex reordering and duplication detection mechanisms increases device complexity
Solution Approach 1:
The patent divides packet handling into separate processes: receiving packets from source and target cells, reordering packets individually from each cell, detecting duplications, and then reassembling them. This segmentation allows complex packet management during handover without overwhelming the device, resolving the contradiction between reliability and complexity.
Solution Approach 2:
The patent performs reordering and duplication detection before packet transmission to the upper layer. By preparing packets in advance and ensuring they are in the correct sequence and non-duplicative before sending, the system prevents handover interruptions without requiring complex real-time handling mechanisms.
2Reliability
If simultaneous connectivity with source and target cells is maintained, then handover interruptions are reduced, but resource consumption increases
Solution Approach 1:
The patent maintains connectivity with both source and target cells during handover (excessive action), but only processes packets from the target cell after handover is complete. This partial application of simultaneous connectivity reduces energy consumption compared to fully maintaining both connections throughout the entire handover process.
3Manufacturing precision
If packets are reordered and duplication detected after header compression, then in-sequence delivery is ensured, but processing time increases
Solution Approach 1:
The patent performs header compression first, then reordering and duplication detection. By completing the header compression in advance and then processing packets in sequence, the system ensures accurate packet ordering while minimizing total processing time through efficient sequential operations.
Data Source
AI summary
Some embodiments of this disclosure include systems, apparatuses, methods, and computer-readable media for the reduction of handover interruptions. Some embodiments include a user equipment (UE) that supports simultaneous connectivity with a source 5G Node B (gNB) and a target gNB during a handover. Some embodiments include the UE receiving source path data packets from the source gNB and target path data packets from a target gNB. The UE performs a first reorder of the one or more source path data packets and the one or more target path data packets by sequence number (SN), and the UE performs header decompression on the reordered source path data packets, separately from the reordered target path data packets. After the header decompressions the UE performs a second reorder of the source path data packets and the target path data packets together by SN, and discards any duplicate data packets based on SNs.