X2 Proxy Relocation for Mobile Relay in LTE-Advanced
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Solution Overview
Problem
In wireless cellular communication systems, particularly in LTE-Advanced, the X2 proxy function fails to work effectively between a Mobile Relay (MR) or a Home evolved Node B (HeNB) and neighboring base stations when the MR moves away from the initial Donor eNB, leading to a lack of X2 interface and inability to maintain multiple X2 proxies synchronously.
Innovation Solution
The method involves triggering the X2 proxy to relocate from an initial node to a second node or setting up an X2 interface between a third node and the second node, using the second node as an X2 proxy for the third node and adjacent base stations, including evolved Node B, Relay Node, Pico, or Home evolved Node B, during or after handover, and activating/deactivating the X2 proxy function as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the MR moves away from the initial DeNB, then the MR can serve high-speed railway users across multiple cells, but the X2 proxy function fails to work effectively between the MR and neighboring base stations
Solution Approach 1:
The patent implements dynamic X2 proxy relocation where the X2 proxy function transitions from a static initial DeNB to multiple target DeNBs based on MR movement. The MME dynamically determines which DeNB should serve as the new X2 proxy when the MR handovers to a new cell, ensuring the proxy function remains effective regardless of MR position.
Solution Approach 2:
The MME acts as an intermediary that coordinates the X2 proxy relocation process. It receives handover notifications from source DeNB, determines the appropriate target DeNB to become the new X2 proxy, and manages the transition to maintain continuous X2 proxy functionality during MR movement.
2Device complexity
If a single X2 proxy is maintained at the initial DeNB, then the system structure is simple, but multiple X2 proxy relationships cannot be maintained synchronously when MR handovers
Solution Approach 1:
The system dynamically adjusts the number and location of X2 proxies based on MR handover status. While typically one X2 proxy is maintained for simplicity, the system can transition to multiple X2 proxies at different DeNBs when the MR serves multiple cells, balancing structural simplicity with operational adaptability.
Solution Approach 2:
The X2 proxy function is segmented and can be distributed across multiple DeNBs rather than being centralized at one initial DeNB. Each target DeNB can independently maintain an X2 proxy relationship with the MR, allowing the system to scale from single-proxy to multi-proxy configurations as needed.
3Reliability
If the X2 proxy is relocated to a target DeNB during handover, then the X2 proxy function is maintained, but additional signaling and coordination overhead is introduced
Solution Approach 1:
The X2 proxy relocation is triggered proactively upon receiving the handover notification from the source DeNB, before the MR completes the handover to the target cell. This preliminary action ensures the target DeNB is prepared to immediately assume the X2 proxy role, minimizing service interruption and reducing overall handover signaling time.
Data Source
AI summary
The embodiments of the present document disclose a mobile relay, and a method for enhancing and processing an X2 interface proxy. The method for enhancing an X2 interface proxy comprises: triggering an X2 proxy to relocate from a first node to a second node, or triggering to set up an X2 interface between a third node and the second node; and using the second node as an X2 proxy of the third node and a base station adjacent to the third node.