PDCP Entity Re-establishment for Header Decompression Errors
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Solution Overview
Problem
In next-generation mobile communication systems, the header compression protocol fails to perform decompression correctly during PDCP entity re-establishment procedures due to out-of-order data reception during handover or radio link failure, leading to errors.
Innovation Solution
A method is introduced to identify and buffer out-of-sequence packets, perform header decompression upon PDCP re-establishment, and transmit decompressed packets only when sequence numbers are sequential, using robust header compression (ROHC) protocols to ensure synchronized header compression and decompression between transmitting and receiving PDCP entities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the PDCP entity performs re-establishment procedure during handover or radio link failure, then the system can recover from failure and continue transmission, but header decompression errors occur due to out-of-order data reception
Solution Approach 1:
The patent applies preliminary action by performing header decompression on buffered out-of-order packets immediately when PDCP re-establishment is triggered, rather than waiting for packets to arrive in sequence. This advance decompression ensures that when packets are delivered to upper layers, the decompression context is already synchronized, preventing errors while maintaining reliability during handover or radio link failure recovery
Solution Approach 2:
The patent implements beforehand cushioning by decompressing headers of buffered packets in advance during PDCP re-establishment. This creates a cushion of pre-decompressed data that protects against decompression errors that would otherwise occur when out-of-order packets are delivered to upper layers after recovery from handover or radio link failure
2Loss of time
If out-of-order packets are delivered to upper layers immediately, then transmission latency is reduced, but header decompression fails due to unsynchronized compression context
Solution Approach 1:
The patent performs header decompression in advance during PDCP re-establishment before packets are delivered to upper layers. This preliminary decompression action ensures that when out-of-order packets are eventually delivered, the decompression context is already synchronized with the transmitter, achieving both low latency and high reliability
Data Source
AI summary
A communication technique for converging a 5G communication system, which is provided to support a higher data transmission rate beyond a 4G system with an IoT technology, and a system therefor applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety related service, or the like) based on the 5G communication technology and the IoT related technology by re-establishing a PDCP entity for a header compression protocol and activating uplink semi-persistent scheduling.