DC-HSUPA UE Inter-Frequency Measurement Reconfiguration
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Solution Overview
Problem
The HSUPA specifications do not provide clear guidance on how to perform inter-frequency measurements when UE is reconfigured from SC UL to DC UL and back to SC UL, leading to a need for a technique that ensures compliance with both Rel-8 and Rel-9 specifications.
Innovation Solution
The method involves configuring UE to perform intra-frequency and inter-frequency measurements on specific frequencies, reconfiguring UE to operate in different modes while maintaining and merging neighbor cell lists and active sets, and automatically generating new virtual active sets without measurement control messages in the SC UL mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the UE is reconfigured from SC UL to DC UL and back to SC UL following legacy specifications, then the UE can operate in different carrier modes, but the inter-frequency measurement continuity is lost and compliance with both Rel-8 and Rel-9 specifications cannot be achieved
Solution Approach 1:
The UE maintains the inter-frequency NCL and VASET in advance before mode reconfiguration occurs. When reconfiguring from SC UL to DC UL or back to SC UL, these pre-maintained structures allow the UE to continue inter-frequency measurements without interruption, ensuring compliance with both Rel-8 and Rel-9 specifications throughout the transition.
2Measurement precision
If the UE maintains separate NCL and ASET structures for different frequencies and modes, then measurement accuracy is improved, but the UE complexity and signaling load increase
Solution Approach 1:
The inter-frequency NCL and VASET structures are designed to serve multiple functions: they support inter-frequency measurements in SC UL mode, continue to function during DC UL mode transitions, and enable seamless return to SC UL mode. This multi-functionality eliminates the need for separate measurement structures for different modes, reducing UE complexity while maintaining measurement accuracy.
3Duration of action of stationary object
If the UE performs inter-frequency measurements continuously across mode changes, then measurement reporting seamless is achieved, but the signaling load and processing requirements increase
Solution Approach 1:
The UE performs inter-frequency measurements continuously without interruption during mode reconfigurations. By maintaining the inter-frequency NCL and VASET throughout SC UL to DC UL and back transitions, the measurement process remains uninterrupted, enabling seamless measurement reporting while avoiding the need for reconfiguration signaling that would otherwise increase signaling load.
Data Source
AI summary
Disclosed are systems and methods for continuous inter-frequency measurement reconfigurations in a DC-HSUPA User Equipment (UE). In one aspect, the system may configure the UE to perform intra-frequency measurements on a frequency f1 and inter-frequency measurements on a frequency f2 in a dual carrier (DC) downlink (DL) mode and a single carrier (SC) uplink (UL) mode. The system may then reconfigure the UE to operate in a DC UL mode and continuing to perform inter-frequency measurements on the frequency f2 in the DC UL mode. The system may then reconfigure the UE to operate in the SC UL mode and continuing to perform inter-frequency measurements on frequency f2 in the SC UL mode.