Dual Connectivity Channel Quality Reporting for Rapid Recovery
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Solution Overview
Problem
In heterogeneous wireless networks, user equipment (UE) with dual connectivity to macro and small cells faces challenges in detecting and recovering from small cell connection loss due to limited backhaul connections and varying channel quality, leading to potential delays and reduced network performance.
Innovation Solution
The UE measures and reports small cell channel quality to both the macro and small cells, allowing the macro cell to detect connection loss and quickly resume communication, thereby avoiding unnecessary delays by configuring a time division multiplexing (TDM) pattern that enables immediate switching to the macro cell when small cell channel quality falls below a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the UE reports channel quality to both macro and small cells, then connection loss detection speed is improved, but signaling overhead and network complexity increase
Solution Approach 1:
The reporting mechanism is segmented into two distinct paths: one for reporting to the small cell and another for reporting to the macro cell. This segmentation allows each base station to receive relevant channel quality information independently, enabling faster local detection of connection loss without requiring complex coordinated reporting protocols.
Solution Approach 2:
The UE acts as an intermediary that collects channel quality measurements and distributes reports to both the small cell and macro cell. This intermediary role enables the macro cell to be informed of small cell channel conditions without requiring direct communication between base stations, reducing backhaul dependency and detection delay.
2Reliability
If the UE switches to macro cell immediately when small cell quality drops, then service continuity is improved, but switching control complexity increases
Solution Approach 1:
The macro cell is pre-configured with the capability to immediately resume service when it receives channel quality reports indicating small cell degradation. This preliminary preparation allows the macro cell to be ready for instant takeover without requiring complex real-time decision algorithms or coordinated switching procedures.
Solution Approach 2:
The dual reporting mechanism creates a feedback loop where the macro cell continuously monitors small cell channel quality through UE reports. When the feedback indicates channel quality below a threshold, the macro cell automatically activates service resumption, enabling reliable switching through simple threshold-based feedback control rather than complex switching logic.
3Productivity
If dual connectivity is maintained with limited backhaul, then network capacity is improved, but connection stability deteriorates
Solution Approach 1:
The UE serves as an intermediary that bridges the gap between small cell and macro cell by relaying channel quality information. This intermediary function allows the macro cell to monitor small cell conditions without requiring high-capacity backhaul connections, maintaining network capacity while improving connection stability through informed proactive switching.
Solution Approach 2:
By maintaining dual connectivity with the macro cell as a pre-configured backup option, the system prepares for potential small cell failures in advance. This preliminary arrangement allows immediate service resumption on the macro cell when needed, stabilizing connections while preserving the network capacity benefits of small cell offloading.
Data Source
AI summary
Disclosed is a User Equipment UE, which establishes connection with a macro eNB (or master eNB) and a small cell eNB (or secondary eNB), measures channel quality (CQI) of a signal received from the small cell eNB, derives a second channel quality based on the measured channel quality of the signal received from the small cell eNB, transmits information associated with the measured channel quality of the signal to the small cell eNB and transmits information associated with the second channel quality to the macro eNB.