Base Station Content Caching for Seamless Wireless Handover
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Solution Overview
Problem
In wireless communication networks, especially in WiMAX, the existing methods for content transmission result in high transmission costs and latency due to inefficient handover processes, where mobile stations experience pauses in content delivery and increased latency during handovers, leading to undesirable quality of service, especially in streaming applications.
Innovation Solution
Implementing a caching system where base stations cache content based on predicted mobile station trajectories and historical data, allowing for partial content transmission and efficient handover by using cache servers to reduce the need for retransmitting already received packets and minimizing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mobile station retrieves content from new base station during handover, then content delivery can resume, but transmission cost increases due to retransmitting already received packets
Solution Approach 1:
The system performs preliminary actions by predicting the mobile station's trajectory and proactively caching content at base stations along the predicted path before handover occurs. This allows the mobile station to continue receiving content from the predicted base station without interruption or retransmission, resolving the contradiction between delivery continuity and transmission cost
Solution Approach 2:
The system creates copies of content at multiple base stations along the predicted trajectory. When handover occurs, the mobile station can retrieve content from the copy at the new base station rather than requiring retransmission from the original base station, maintaining continuity while avoiding the cost of retransmitting already received packets
2Adaptability or versatility
If mobile station undergoes handover between base stations, then mobility is supported, but latency increases due to pausing content transmission
Solution Approach 1:
The system predicts the mobile station's trajectory and proactively caches content at future base stations before handover occurs. This preliminary action ensures that when handover happens, the content is already available at the target base station, eliminating transmission pauses and reducing latency while maintaining handover support
Solution Approach 2:
The system introduces a trajectory prediction mechanism as an intermediary that bridges the mobile station and base stations. This intermediary predicts future positions and triggers proactive content caching, allowing seamless handover without pausing transmission and reducing the time loss associated with traditional handover processes
3Productivity
If content is cached at multiple base stations along predicted trajectory, then transmission cost and latency are reduced, but device complexity increases
Solution Approach 1:
The system implements self-service by enabling base stations to autonomously cache content based on predicted mobile station trajectories. Each base station can independently determine whether to cache content based on its position in the predicted trajectory, eliminating the need for complex centralized control and reducing overall system complexity while improving transmission efficiency
Solution Approach 2:
The system applies local quality by having each base station cache content locally based on its specific position in the predicted trajectory. Rather than uniformly caching content at all base stations, the system selectively caches content at specific locations along the trajectory, reducing unnecessary complexity while maintaining high transmission efficiency
Data Source
AI summary
The present invention provides methods and systems for transmitting content in a wireless communication network. The method includes caching a content in each base station of a set of base stations in the wireless communication network. The content includes a plurality of packets. In response to caching the content, a first base station belonging to the set of base stations transmits a first group of packets of the content to a mobile station. The method further includes handing over the mobile station to a second base station. The second base station belongs to the set of the base stations. The second base station resumes transmission of a second group of packets of the content to the mobile station.