LTE Handover Signaling Optimization via Preferred Target Node Indication
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Solution Overview
Problem
Current handover procedures in LTE networks are inefficient when multiple target eNBs are involved, as they either unnecessarily forward data to all prepared nodes or wait until late in the process to determine the selected node, leading to bandwidth inefficiencies and complex signaling.
Innovation Solution
Identify a preferred target node and initiate data forwarding to it as soon as the handover request acknowledgement is received, with optional cancellation of prepared contexts for non-selected nodes, reducing unnecessary signaling and improving bandwidth usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data forwarding is initiated to all prepared target nodes, then data delivery reliability is improved, but bandwidth efficiency deteriorates and signaling complexity increases
Solution Approach 1:
The source eNB performs preliminary identification of a preferred target node based on handover criteria before initiating data forwarding. This preliminary action allows the system to forward data to the most likely successful target node, improving bandwidth efficiency while maintaining reliability through selective forwarding rather than universal forwarding to all prepared nodes.
2Device complexity
If data forwarding waits until handover completion to determine selected node, then signaling complexity is reduced, but handover time increases and bandwidth efficiency deteriorates
Solution Approach 1:
The source eNB performs preliminary identification of the preferred target node before the handover execution phase. By making this determination in advance based on available criteria, the system can initiate data forwarding earlier, reducing handover time and improving bandwidth efficiency without significantly increasing signaling complexity during the execution phase.
3Adaptability or versatility
If multiple target nodes are prepared without preference indication, then node selection flexibility is improved, but data forwarding efficiency deteriorates
Solution Approach 1:
The source eNB performs preliminary evaluation of multiple target nodes and identifies a preferred one based on handover criteria such as signal strength or network conditions. This preliminary selection allows efficient data forwarding to the optimal target node while maintaining the flexibility to switch to alternative nodes if necessary, thus improving data forwarding efficiency without sacrificing adaptability.
Data Source
AI summary
A method for handover of a mobile terminal from a source node to a target node in a wireless telecommunications network, including the steps of: adding an indication in the preparation phase by which source node indicates to the target node if it is the one preferred or not. If a target node is not the one preferred but is still selected by the UE, it may indicate this to the source node as by a specific new message that comes earlier in the handover process than a message requesting the source node to release resources following successful handover to a new node. The source node can then in this case cancel handover preparations to other target nodes earlier and also start data forwarding where applicable earlier.