Data Compression Context Transfer During LTE Handover
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Solution Overview
Problem
In LTE wireless communication systems, handovers between base stations can disrupt data transmission, leading to delays and inefficiencies due to the need for reestablishing data compression contexts, which affects the quality of service, especially for delay-sensitive communications.
Innovation Solution
The system determines the data compression capabilities of the target base station and transfers context information from the source base station to the target base station during a handover, allowing the target base station to continue data compression without reestablishing the context, and identifies gaps in packet sequences for retransmission using the same compression techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data compression context is reestablished during handover, then the target base station can independently process compressed data, but handover delays increase and communication efficiency decreases
Solution Approach 1:
The source base station performs preliminary actions by determining the data compression capabilities of the target base station before handover, and proactively transfers the data compression context information to the target base station in advance. This allows the target base station to already possess the necessary context when the handover occurs, eliminating the need for reestablishment and reducing handover delays.
Solution Approach 2:
The source base station acts as an intermediary by transferring the data compression context from itself to the target base station. This intermediary action ensures that the target base station receives the necessary context information without the UE needing to retransmit or reestablish the compression context, thereby maintaining continuity while enabling seamless handover.
2Productivity
If data compression context is transferred during handover, then handover delays are reduced and communication efficiency is enhanced, but system complexity increases due to capability determination and context management
Solution Approach 1:
The handover management mechanism is designed to be universal by integrating data compression capability determination and context transfer into the existing handover procedure. The source base station uses its existing capability to determine target base station capabilities (already used for other handover parameters) and extends it to data compression capabilities, avoiding the need for separate complex procedures.
Solution Approach 2:
The system manages complexity by dynamically adjusting parameters based on capability matching. When the target base station's data compression capabilities match the source base station, the full context is transferred; when they differ, the context is adapted or discarded. This parameter-based approach simplifies decision-making compared to implementing all possible context transfer scenarios.
3Reliability
If packet gaps are identified and retransmitted using same compression techniques, then data integrity is maintained, but additional transmission overhead and processing time are required
Solution Approach 1:
Instead of retransmitting the original uncompressed packets or using different compression methods, the system creates a copy of the compression context and applies it to the retransmitted packets. The UE retransmits packets using the same compression technique that was originally applied, and the target base station uses the transferred context to decompress them correctly, ensuring data integrity while minimizing overhead.
Data Source
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AI summary
A user equipment (UE) and source base station may use data compression techniques for data packets sent between them. During a handover, the source base station may provide data compression context to a target base station, thus enabling the target base station to continue the data compression following the handover without having to reestablish the data compression context. The source base station may determine data compression capabilities of the UE or the target base station, or both, and may communicate the determined data compression capabilities to the UE or target base station. The source base station may identify at least one gap in a sequence of packets received from the UE, and communicate the existence of the gap to the target base station, which may request retransmission of packets associated with the gap.