Duplicated Packet Processing in Mobile Communication Systems
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Solution Overview
Problem
In mobile communication systems with dual connectivity, duplicated packets received after reordering timer expiration can lead to erroneous ROHC information updates, causing decompression processing delays due to the processing of old information.
Innovation Solution
A user apparatus is configured to detect duplicated packets and determine if PDCP re-establishment is being performed, discarding the packet without processing when re-establishment is not occurring to avoid using outdated ROHC information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If duplicated packets are processed to update ROHC information, then header decompression can be maintained, but outdated ROHC information causes processing delays and errors
Solution Approach 1:
The patent applies preliminary action by checking whether PDCP re-establishment is being performed before processing duplicated packets. When re-establishment is detected, the system prepares to update ROHC information; when not detected, it preemptively discards duplicated packets without processing. This preliminary check prevents the use of outdated ROHC information and avoids processing delays, ensuring that header decompression always uses current context information.
2Productivity
If duplicated packets are discarded without processing, then processing delays are avoided, but ROHC information updates may be missed
Solution Approach 1:
The system performs a preliminary check to determine whether PDCP re-establishment is occurring before deciding how to handle duplicated packets. When re-establishment is detected, the system allows processing of duplicated packets to update ROHC information; when not detected, it discards them immediately. This conditional preliminary action ensures that ROHC information is updated only when necessary, maintaining both processing efficiency and information accuracy.
Data Source
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AI summary
A user apparatus in a mobile communication system in which packets of a bearer are distributed among a plurality of base stations, and the distributed packets of the bearer are transmitted from the plurality of base stations to the user apparatus, including: a reception unit configured to sequentially receive packets of the bearer from the plurality of base stations; and a duplicated packet processing unit configured, when detecting an duplicated packet, from packets received by the reception unit, which is a duplicate of a packet, to determine whether re-establishment of a predetermined packet communication protocol including a header compression and decompression protocol is being performed in the user apparatus, and, when re-establishment of the predetermined packet communication protocol is not being performed, to discard the duplicated packet without performing header decompression processing of the duplicated packet.