Active Handoffs in Wireless Networks
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Solution Overview
Problem
Conventional handoff methods in wireless communication networks face challenges in maintaining header compression ratios during handoffs, leading to communication delays and data loss, as they require transferring large amounts of historical information, which is unacceptable for real-time applications like voice over IP.
Innovation Solution
The method involves selectively transferring historical information by using sequence numbers to synchronize data segments between source and target network devices, applying processing techniques at various network layers to ensure minimal data loss and maintain compression ratios during handoffs, while reducing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional handoff methods transfer large amounts of historical information to maintain header compression ratios, then header compression ratios are maintained, but communication latency increases and handoff time is extended
Solution Approach 1:
The patent extracts only the essential historical information (sequence numbers) needed for handoff rather than transferring complete historical data. By identifying and transferring only the critical sequence number parameters that enable header compression state reconstruction, the system maintains compression ratios while dramatically reducing handoff data volume and latency.
Solution Approach 2:
The patent segments the handoff process into distinct phases: identifying the handoff trigger, extracting sequence numbers from both forward and reverse directions, transferring only these essential parameters, and reconstructing the compression state at the target access point. This segmentation enables selective information transfer that maintains reliability while reducing time loss.
2Reliability
If conventional handoff methods transfer complete historical data to ensure data completeness, then data loss is minimized, but the complexity of the handoff process increases
Solution Approach 1:
The patent extracts only the essential sequence number parameters from the complete historical data that are sufficient for maintaining data completeness. By identifying that sequence numbers alone enable reconstruction of the header compression state without transferring entire historical data sets, the system reduces process complexity while ensuring data integrity.
Solution Approach 2:
The patent performs preliminary identification and extraction of sequence numbers before the actual handoff execution. By preparing the essential parameters in advance and transferring them selectively, the system simplifies the handoff process while ensuring complete data reconstruction at the target access point.
3Reliability
If conventional handoff methods transfer all historical information to maintain compression state, then header compression functionality is preserved, but the amount of data transferred increases
Solution Approach 1:
The patent extracts only the sequence number parameters from the complete historical information that are essential for preserving compression state. By transferring only these critical parameters rather than all historical data, the system maintains header compression functionality while reducing data transfer volume by a significant margin.
Solution Approach 2:
The patent changes the parameter set being transferred from complete historical data to a minimal set of sequence numbers. This parameter transformation enables the system to preserve compression state functionality while dramatically reducing the quantity of data that must be transferred during handoff.
Data Source
AI summary
Techniques for transferring a communication connection for a client device from a source network device to a target network device include receiving first and second sequence numbers and applying a first processing technique to data segments associated with sequence numbers that succeed the first and the second sequence numbers.