Wideband CQI Definition for MTC UEs via Narrowband Averaging
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently measuring and reporting channel quality indicators (CQI) for machine-type communication (MTC) user equipment (UEs), particularly in reducing cost and battery consumption while supporting low data rate and occasional uplink/downlink data transmission.
Innovation Solution
A method and apparatus for defining a wideband CQI by averaging narrowband CQIs over multiple narrowbands, using cell-specific reference signals (CRS) or channel state information reference signals (CSI-RS), and transmitting the measured wideband CQI to the network, which includes a processor and transceiver in the MTC UE to control the reception and transmission of these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If MTC UEs use full bandwidth for CQI measurement, then measurement accuracy is improved, but device complexity and power consumption increase
Solution Approach 1:
The patent divides the wideband CQI measurement into multiple narrowband CQI measurements. The UE measures CQI separately in each narrowband (e.g., 6 physical resource blocks per narrowband) and then combines these measurements to derive the wideband CQI. This segmentation allows the low-complexity UE to perform measurements in smaller, manageable frequency portions rather than requiring full bandwidth processing at once.
Solution Approach 2:
The patent combines multiple narrowband CQI measurements to form a wideband CQI. The UE performs CQI measurements in multiple narrowbands and merges these results through combination operations (such as averaging or selection based on channel conditions) to obtain the final wideband CQI value, thereby achieving accurate wideband measurement without requiring simultaneous full-bandwidth processing.
2Measurement precision
If MTC UEs use full bandwidth for CQI measurement, then measurement accuracy is improved, but power consumption increases
Solution Approach 1:
The patent segments the CQI measurement process into multiple narrowband measurements performed at different times or frequency locations. This allows the UE to activate its RF and baseband processing only for the necessary narrowband portions rather than continuously operating at full bandwidth, thereby reducing overall power consumption while still obtaining accurate wideband CQI information through combination of the segmented measurements.
3Reliability
If frequency hopping is configured for MTC UEs, then coverage and reliability are improved, but CQI measurement complexity increases
Solution Approach 1:
The patent performs CQI measurements on multiple narrowbands in advance before actual data transmission occurs. By measuring and reporting CQI for multiple narrowbands beforehand, the network can make informed scheduling decisions about where to allocate resources for frequency-hopped transmissions, thereby supporting reliability improvements from frequency hopping without requiring complex real-time measurements during the hopping process.
Data Source
AI summary
A method and apparatus for measuring a channel quality indicator (CQI) in a wireless communication system is provided. A machine-type communication user equipment (MTC UE) receives at least one of a cell-specific reference signal (CRS) or a channel state information reference signal (CSI-RS) from a network, measures a wideband CQI over plurality of narrowbands based on the received CRS or CSI-RS by averaging narrowband CQIs of the plurality of narrowbands, and transmits the measured wideband CQI to the network.