RoHC Context Transfer for LTE Handover Latency
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Solution Overview
Problem
In wireless communication systems, especially in LTE, the frequent re-establishment of Robust Header Compression (RoHC) context during inter-base station handovers leads to significant capacity loss and latency increase, degrading user experience in applications like VoIP and mobile gaming.
Innovation Solution
Facilitating the efficient transfer of a subset of compression context, including static and semi-static context, from a source base station to a target base station during handovers, allowing partial or full establishment of compression context before or during the handover, and using indicators to determine the remaining context to be established.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If RoHC context is re-established at each inter-base station handover, then the compression context is properly established between mobile device and target base station, but capacity loss and latency increase significantly
Solution Approach 1:
The source base station performs preliminary actions by transferring the RoHC context to the target base station before the handover is complete. This allows the target base station to have the compression context ready in advance, eliminating the need for re-establishment after handover and reducing latency.
Solution Approach 2:
The source base station acts as an intermediary by holding and transferring the RoHC context to the target base station. This intermediary transfer mechanism ensures continuous compression context availability across base station boundaries without requiring full re-establishment at the target.
2Reliability
If full RoHC context is transferred during handover, then compression context is fully established, but signaling overhead and processing complexity increase
Solution Approach 1:
The patent extracts only the necessary RoHC context information (static and semi-static parts) from the full context, transferring only this subset during handover. This extraction approach maintains compression effectiveness while reducing the complexity and overhead of full context transfer.
3Device complexity
If RoHC context re-establishment is required only for inter-BSC handovers, then system complexity is reduced, but intra-BSC handovers also suffer from capacity loss
Solution Approach 1:
The patent introduces dynamic context transfer capability that can be applied selectively based on handover type and context validity. The system dynamically determines whether to transfer context or re-establish it, providing flexibility that reduces capacity loss without unnecessarily increasing complexity for all handover scenarios.
Data Source
AI summary
Systems, methodologies, and devices are described that facilitate transferring a subset of compression context from a source base station to a target base station during an inter-base station handover of a mobile device to facilitate establishment of compression context between the mobile device and target base station. The source base station can transfer a subset of compression context comprising static and semi-static context to the target base station during inter-base station handover to at least partially establish compression context between the mobile device and target base station prior to or during handover. The source base station can transmit, to the mobile device, indicator information related to compression context transferred. The target base station can at least partially establish compression context based on received subset of compression context to facilitate efficient communication with the mobile device and can establish any remaining portion of compression context with the mobile device after handover.