Network Node Subframe Distribution for LTE Channel Measurement Accuracy
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Solution Overview
Problem
In dynamically shared spectrum networks, LTE UEs experience interference from NR PDSCH over CRS REs, leading to inaccurate channel state information (CSI) and mobility measurements, which compromises the performance of LTE UEs.
Innovation Solution
A network node intelligently distributes subframes between LTE and NR to ensure sufficient LTE subframes for channel measurements by aligning LTE measurements with interference-free periods and adjusting resource allocation to minimize NR interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spectrum is dynamically shared between LTE and NR, then spectrum utilization efficiency is improved, but channel measurement accuracy for LTE UEs deteriorates due to interference from NR PDSCH over CRS REs
Solution Approach 1:
The system dynamically adjusts subframe allocation between LTE and NR based on real-time traffic conditions and measurement requirements. The network node determines whether to configure dynamic spectrum sharing or LTE-NR coexistence mode, and adjusts the number of LTE subframes allocated for channel measurements according to UE velocity and service requirements, creating a flexible adaptive resource allocation mechanism
Solution Approach 2:
The invention changes key parameters including the number of LTE subframes allocated for channel measurements, the subframe allocation pattern between LTE and NR, and the mode of operation (dynamic spectrum sharing vs. coexistence). These parameter adjustments allow the system to optimize the balance between spectrum utilization and measurement accuracy based on current network conditions
2Productivity
If more subframes are allocated to NR, then NR traffic capacity is improved, but sufficient LTE subframes for channel measurements are reduced
Solution Approach 1:
The network node performs preliminary determination of the required number of LTE subframes for channel measurements before finalizing the subframe allocation. By calculating the minimum LTE subframe requirements in advance based on UE velocity and service type, the system ensures that measurement reliability is guaranteed before allocating remaining resources to NR traffic
Solution Approach 2:
The system dynamically adjusts the subframe allocation between LTE and NR based on real-time conditions. When LTE UEs require channel measurements, the allocation pattern is adjusted to provide sufficient LTE subframes; when measurement requirements are met, more subframes can be allocated to NR to increase its traffic capacity
Data Source
AI summary
A shared spectrum is shared between at least a first RAT (radio access technology) and a second RAT. The channel measurements are for upcoming radio communications with a first User Equipment, UE, of the first RAT. The network node determines a required number of first RAT subframes for the upcoming radio communications in a next time period, and a required number of second RAT subframes for the upcoming radio communications in a next time period. Based on the determined required number of first RAT subframes and required number of second RAT subframes, the network node then distributes subframes between the first RAT and the second RAT in the shared spectrum. The number of first RAT subframes and the number of second RAT subframes are distributed such that there are sufficient first RAT subframes for the first UE to perform channel measurements for its upcoming radio communication.