User Equipment CQI Feedback Using Joint Sector Estimation
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Solution Overview
Problem
In conventional WCDMA cellular networks, user equipment (UE) faces high complexity and resource wastage when estimating channel quality indicators (CQI) across multiple sectors, requiring multiple measurements and increasing hardware load.
Innovation Solution
The UE estimates CQIs of multiple sectors and joint sectors simultaneously using precoding matrices and channel matrices, allowing for feedback of CQIs using predefined rules to reduce complexity and resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UE performs multiple CQI estimations to obtain CQIs of multiple sectors, then the CQI feedback accuracy is improved, but the UE complexity and hardware resource consumption increase
Solution Approach 1:
The patent merges the CQI estimation processes for multiple sectors into a single unified estimation operation. By combining the channel quality indicators of multiple sectors into one joint CQI value, the system achieves accurate sector identification without requiring the UE to perform separate estimations for each sector, thereby reducing computational complexity while maintaining measurement precision.
Solution Approach 2:
The patent creates a universal CQI estimation mechanism that serves multiple sectors simultaneously through a single estimation process. The joint CQI value functions as a multi-purpose indicator that enables the network to identify the best serving sector without requiring dedicated CQI measurements for each individual sector, thus reducing UE hardware resource consumption while maintaining accurate sector selection.
2Measurement precision
If the UE performs multiple CQI estimations to obtain CQIs of multiple sectors, then the CQI feedback accuracy is improved, but the hardware resource consumption increases
Solution Approach 1:
The patent combines multiple sector-specific CQI estimation operations into a single joint CQI estimation. This merging approach allows the UE to derive channel quality information for multiple sectors through one estimation process, significantly reducing the computational energy and hardware resource consumption while preserving the accuracy needed for proper sector identification and service quality maintenance.
3Reliability
If the network uses multiple sectors to provide service, then the service quality is improved, but the resource allocation complexity increases
Solution Approach 1:
The patent extracts the sector identification function from complex multi-sector resource allocation management. By using a single joint CQI value that inherently contains information about the best serving sector, the system separates the sector selection decision from the resource allocation process, simplifying network management while maintaining the ability to provide high-quality service through appropriate sector selection.
Data Source
AI summary
Embodiments of the present disclosure disclose a channel quality indicator (CQI) feedback method, user equipment, and a network device. The method includes: receiving, by the user equipment, a secondary pilot receive signal of each single sector and that is obtained after a secondary pilot transmit signal of each single sector transmitted by a network device is transmitted by using a radio channel; estimating, by the user equipment, a channel matrix according to the secondary pilot receive signal of each single sector and the pre-known secondary pilot transmit signal of each single sector; estimating, by the user equipment, a CQI of each single sector according to the channel matrix and a first precoding matrix, and estimating a CQI of each joint sector according to the channel matrix and a second precoding matrix; and feeding back, by the user equipment, each CQI to the network device.