RAN Cache Segmentation for Video Handover Continuity
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Solution Overview
Problem
The existing wireless communication systems face challenges in accelerating data transmission due to the high cost and limited device space of adding storage devices on Radio Access Nodes (RAN nodes), leading to inefficient video caching and playback issues, especially when users move to different RAN nodes, resulting in frozen video playback and poor user experience.
Innovation Solution
A method where a first part of a data file is stored in the RAN cache and transmitted to the user equipment (UE), while the remaining part is obtained from an external server, ensuring continuous data transmission and reducing storage needs on RAN nodes. Additionally, when the UE moves, a TCP connection is reestablished to ensure uninterrupted data transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If storage devices are added to RAN nodes to increase cache capacity, then video transmission acceleration is improved, but device cost and device space requirements increase
Solution Approach 1:
The patent segments video content into multiple parts and distributes them across different RAN nodes. Instead of storing entire videos on each RAN node, the system divides video files into segments and caches them across the network, reducing storage requirements on individual nodes while maintaining acceleration capability.
Solution Approach 2:
The patent introduces a cache management entity that acts as an intermediary between the content delivery network and RAN nodes. This entity coordinates content distribution, manages cache allocation, and enables RAN nodes to retrieve cached content from other nodes, eliminating the need for each node to have large local storage.
2Loss of time
If more videos are stored in the cache on the RAN node, then video access acceleration is improved, but storage space requirements increase
Solution Approach 1:
The patent merges the caching capabilities of multiple RAN nodes into a distributed cache system. When one RAN node needs video content, it can retrieve it from other nodes that have it cached, effectively combining their storage resources. This allows the system to serve more video requests without increasing individual node storage capacity.
Solution Approach 2:
The patent makes RAN nodes multi-functional by enabling them to serve both as access points for users and as distributed cache nodes. Each RAN node can store and serve video segments to multiple different users, making the storage infrastructure universal across the network rather than dedicated to single-node operations.
3Adaptability or versatility
If a UE moves to another RAN node during video playback, then mobility is improved, but TCP connection stability deteriorates causing video freezing
Solution Approach 1:
The patent implements mechanisms to maintain continuous video data flow during handover. The cache management entity tracks ongoing video requests and ensures that TCP connections are seamlessly transferred between RAN nodes. Cached video segments are pre-positioned at target RAN nodes before handover, ensuring uninterrupted delivery and maintaining connection stability despite UE mobility.
Data Source
AI summary
A data transmitting method includes receiving from a UE a request to apply for accessing a data file in an external server. If a first part of content of the data file is stored an RAN cache, the first part of the content is transmitted to the UE. When the first part of the content is transmitted to the UE, a second part of the content of the data file is obtained from the external server. After all the first part of the content is transmitted to the UE, the second part of the content is transmitted to the UE.