Core Cache Server Relay for LTE Handover Latency
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Solution Overview
Problem
In mobile communication systems like UMTS and LTE, data transmission is inefficient during handovers due to data loss and the need for re-transmission, which is exacerbated by the decoding and encoding of GTP packets by the Mobility Management Entity (MME), causing data latency and unnecessary processing.
Innovation Solution
A method and device that utilize a core cache server to select a relay core cache unit during a handover, allowing seamless transmission of content data from a source eNB to a target eNB through a logical interface, reducing backhaul costs and ensuring uninterrupted service.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data is transmitted through MME during handover, then data loss is prevented through re-transmission, but data latency increases and processing efficiency decreases
Solution Approach 1:
The patent extracts the content data transmission function from the MME and relocates it to a core cache server. The MME only handles control-plane signaling while user-plane content data is buffered and forwarded by the core cache server, eliminating unnecessary decoding/encoding operations in the MME and reducing data latency during handover.
Solution Approach 2:
The core cache server acts as an intermediary between the eNBs and the content delivery network. It buffers content data and directly forwards it to the target eNB during handover, serving as a mediator that eliminates the need for MME involvement in user-plane data transmission and reduces processing delays.
2Adaptability or versatility
If MME monitors and intercepts all user data-plane and control-plane, then handover detection is enabled, but processing efficiency decreases due to repeated decoding and encoding
Solution Approach 1:
The patent separates the monitoring function from the data transmission function. The MME retains control-plane monitoring for handover detection, while user-plane content data is handled exclusively by the core cache server, eliminating redundant processing in the MME and improving overall system productivity.
Solution Approach 2:
The core cache server is designed to perform multiple functions: buffering content data, detecting handovers through control-plane signaling, and forwarding data to appropriate eNBs. This multi-functional design consolidates processing tasks and improves efficiency by eliminating the need for MME to handle both control and user plane data.
3Reliability
If content data is transmitted during handover through traditional path, then service continuity is maintained, but backhaul costs increase
Solution Approach 1:
The core cache server pre-loads and buffers content data before handover occurs. When handover is detected, the data is already available at the core cache server and can be immediately forwarded to the target eNB without requiring re-transmission through the backhaul, reducing backhaul costs while maintaining service continuity.
Solution Approach 2:
The system discards the traditional MME-based data transmission path during handover and recovers/uses the buffered data at the core cache server instead. This avoids unnecessary backhaul traffic and reduces costs while maintaining service continuity through the cached data.
Data Source
AI summary
A method for transmitting data in a core cache server of a communication system, according to one embodiment of the present invention, comprises the steps of: receiving, from a source base station, a core cache search signal; selecting a relay core cache unit according to the received core cache search signal; and transmitting content data to a target base station through the selected relay core cache unit. A cache server for transmitting and receiving data in a communication system, according to another embodiment of the present invention, comprises: one or more core cache units for storing content data; a receiving unit for receiving, from a source base station, a core cache search signal; a control unit for selecting a relay core cache unit among the one or more core cache units according to the received core cache search signal; and a transmission unit for transmitting the content data to a target base station through the selected relay core cache unit. When the present invention is used, the source base station can continuously provide content to a terminal by transmitting session information and the content to a target base station during a handover of the terminal by using a logical interface between base stations in an LTE system, and in this case, a core cache function is additionally provided such that it is possible to smoothly provide the content to a base station even when moving to a server that does not have a cache function. Thus, backhaul costs caused by a handover are reduced and a user can be provided with improved quality of experience.