Wireless Terminal Interference Measurement Using Almost Blank Subframes
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Solution Overview
Problem
Existing wireless communication networks face challenges in efficiently measuring and coordinating interference between heterogeneous cells, leading to inaccurate RRM, RLM, and CSI measurements, which result in erratic behaviors, failed connections, and suboptimal spectral resource utilization in heterogeneous networks.
Innovation Solution
Implementing enhanced inter-cell interference coordination techniques, including the use of Almost Blank Subframes (ABS) and interference rejection/cancellation methods in wireless communication devices, to restrict measurements to specific subframes and account for interference from neighboring cells, thereby improving measurement accuracy and spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If cells transmit data continuously in heterogeneous networks, then spectral utilization is improved, but interference between cells increases causing inaccurate measurements
Solution Approach 1:
The patent implements Almost Blank Subframes (ABS) where cells periodically switch between normal data transmission subframes and blank subframes with minimal transmission. This periodic action creates measurement opportunities during blank subframes while maintaining spectral utilization during normal subframes, resolving the contradiction between continuous transmission and accurate interference measurement.
2Measurement precision
If cells use Almost Blank Subframes for interference coordination, then measurement accuracy is improved, but spectral utilization decreases due to minimal transmission
Solution Approach 1:
The patent segments the transmission timeline into distinct subframe types: normal subframes for data transmission and Almost Blank Subframes for measurement. This segmentation allows the system to achieve both high spectral utilization during normal subframes and accurate interference measurement during ABS, resolving the trade-off between the two objectives.
3Reliability
If UEs perform measurements during normal subframes, then connection continuity is maintained, but measurement accuracy deteriorates due to ongoing interference
Solution Approach 1:
The patent introduces Almost Blank Subframes as an intermediary measurement opportunity that occurs during normal network operation. These ABS act as a mediator that provides clean measurement conditions without requiring complete transmission shutdown, allowing UEs to perform accurate measurements while the network maintains connectivity and service continuity.
Data Source
AI summary
A wireless communication terminal is disclose. The terminal includes a transceiver coupled to a processor configured to determine that a subset of a plurality of REs must be excluded from demodulation, the plurality of resource elements (REs) received in a signal from a first base station, to estimate a hypothetical block error rate (BLER) based on the signal received from the first base station by excluding the subset of the plurality of Res, and to estimate channel state information based on the hypothetical block error rate (BLER).