Assisting Base Station Handover Signaling Relay
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Solution Overview
Problem
In cellular networks, especially in LTE systems with heterogeneous deployments, handover failures occur due to interference and unreliable data transmissions between source and target cells operating on the same frequency, leading to premature, late, or oscillating handovers, which disrupt user connections.
Innovation Solution
Implementing a method that assists handover message exchange between user equipment (UE) and source cells using an assisting base station, which can operate on a separate frequency, thereby reducing interference and ensuring robust handover performance by establishing dual connectivity and relaying control signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If source and target cells operate on the same frequency to provide coverage, then frequency reuse efficiency is improved, but handover reliability deteriorates due to interference
Solution Approach 1:
The patent introduces a third cell as an intermediary base station that relays handover control messages between the source cell and the terminal. This mediator approach allows handover signaling to be transmitted through a different frequency channel, avoiding direct interference between source and target cells while maintaining the frequency reuse benefit
2Stability of the object's composition
If handover is triggered early to prevent connection loss, then connection continuity is improved, but handover oscillation risk increases
Solution Approach 1:
The patent implements a feedback mechanism where the terminal sends measurement reports to the source base station, which then decides whether to trigger handover. The handover command is relayed through the third cell, and the terminal provides feedback by sending a handover confirmation message. This feedback loop allows for more accurate handover timing decisions, reducing both premature and late handovers
3Productivity
If handover control messages are transmitted directly between source and target cells, then signaling efficiency is improved, but transmission reliability deteriorates due to interference
Solution Approach 1:
The patent uses a third cell as a mediator to relay handover control messages. Instead of direct transmission between source and target cells, the source base station sends the handover command to the third base station, which then forwards it to the terminal. This indirect transmission path avoids interference while maintaining signaling effectiveness
Data Source
AI summary
The present invention relates to base stations, methods in a base station, terminals and methods in a terminal for supporting a handover. The invention further relates to computer programs for implementing, in the respective nodes of a wireless network, functionality for supporting a handover. According to one embodiment, a method in a source base station for supporting a handover of a terminal from the source base station to a target base station is provided. The method comprises the following steps: Sending (1301), to an assisting base station, a request for assisting the handover; and Communicating (1302) handover control information between the terminal and the source base station via the assisting base station.