Joint Channel Quality Indicator for Spectrum Aggregation
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Solution Overview
Problem
Current communication systems using spectrum aggregation in LTE-A face inefficiencies in reporting channel quality metrics for aggregated-spectrum downlink signals, leading to inaccurate hand-off and spectrum allocation decisions due to varying channel conditions across component carriers.
Innovation Solution
A communication terminal evaluates and reports individual channel quality metrics for each component carrier, allowing for joint compression and transmission to the base station, enabling accurate and reliable hand-off and spectrum allocation decisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual channel quality metrics are reported for each component carrier, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple individual channel quality metrics from different component carriers into a single joint channel quality indicator. The terminal evaluates channel quality for each component carrier separately and then computes a joint CQI that represents the overall channel quality across all aggregated carriers, reducing reporting complexity while maintaining measurement precision.
Solution Approach 2:
The patent segments the channel quality measurement process into two distinct stages: first, individual channel quality evaluation for each component carrier; second, joint channel quality indicator computation across all component carriers. This segmentation allows precise per-carrier measurement while simplifying the final reporting mechanism.
2Device complexity
If joint channel quality indicator is computed for all component carriers, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The patent merges individual channel quality metrics into a joint CQI through a systematic computation process that preserves the essential characteristics of each component carrier's channel quality while providing an overall assessment, thus balancing complexity reduction with precision maintenance.
Solution Approach 2:
The joint channel quality indicator serves multiple functions: it represents the overall channel quality across all component carriers, enables simplified reporting to the base station, and provides sufficient information for hand-off and spectrum allocation decisions, making it a universal metric for aggregated-spectrum systems.
3Measurement precision
If separate channel quality indicators are computed for each component carrier, then measurement precision is improved, but loss of information increases due to reporting overhead
Solution Approach 1:
The patent combines multiple separate channel quality indicator reports into a single joint CQI report, significantly reducing the uplink signaling overhead while preserving the essential channel quality information needed for network decisions. This merging eliminates redundant reporting of correlated channel quality metrics across component carriers.
4Reliability
If detailed channel quality information is reported for each component carrier, then reliability is improved, but loss of time increases due to extended reporting
Solution Approach 1:
The patent merges the reporting of multiple component carrier channel quality metrics into a single joint CQI report, reducing the time required for uplink transmission and network processing while maintaining the reliability needed for accurate hand-off and spectrum allocation decisions.
Data Source
Figure 1
Figure 2~3
AI summary
A communication terminal (24) includes a receiver (36), a transmitter (38) and control circuitry (40). The receiver is configured to receive an aggregated-spectrum downlink signal including two or more component carriers in respective spectral bands. The transmitter is configured to transmit an uplink signal to a serving base station (28A) that serves the communication terminal. The control circuitry is configured to evaluate respective channel measures of the two or more component carriers of the aggregated-spectrum downlink signal and to transmit to the serving base station a report, which is based on the channel measures and includes a respective channel quality metric for each of at least two of the component carriers.