CQI Parameter Sets for Accurate RedCap UE Channel Reporting
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Solution Overview
Problem
Existing machine type communication (MTC) and narrow band Internet of Things (NB-IoT) technologies fail to meet the requirements of Internet of Things services that demand rates of tens to one hundred Megabytes and longer delays, particularly for reduced capability user equipment (Redcap UE) due to limitations in bandwidth and antenna number, leading to inaccurate channel quality indication (CQI) reporting.
Innovation Solution
Adapting CQI parameter sets for Redcap UE by adjusting spectral efficiencies and introducing new CQI parameter sets, such as a third CQI parameter set with reduced spectral efficiencies, or using a first offset to bring measured SINR within the range of existing parameter sets, ensuring accurate CQI reporting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If existing CQI parameter sets are used for Redcap UE, then device complexity is reduced, but measurement precision deteriorates due to inaccurate CQI reporting
Solution Approach 1:
The patent modifies existing CQI parameter sets by adjusting spectral efficiency values to create new parameter sets specifically tailored for Redcap UE. This involves changing the parameters of the CQI tables to reflect the actual channel conditions and capabilities of Redcap devices, thereby improving measurement precision without requiring entirely new complex frameworks
Solution Approach 2:
The patent segments the CQI reporting mechanism by creating different parameter sets for different device types. Specifically, it divides the CQI parameter sets into those suitable for normal UE and those optimized for Redcap UE, allowing each segment to operate with appropriate parameters that match its capabilities
2Device complexity
If bandwidth and antenna number are reduced for Redcap UE, then device complexity and cost are reduced, but channel quality measurement accuracy deteriorates
Solution Approach 1:
The patent changes the spectral efficiency parameters in CQI parameter sets to account for the reduced bandwidth and antenna capabilities of Redcap UE. By adjusting these parameters, the system compensates for the hardware limitations and maintains accurate channel quality measurements despite the reduced device complexity
3Ease of operation
If standard CQI parameter sets are used for Redcap UE, then ease of operation is maintained, but reliability deteriorates due to inaccurate channel state determination
Solution Approach 1:
The patent modifies the CQI parameter sets by adjusting spectral efficiency values to create accurate mappings for Redcap UE channel conditions. This ensures that the CQI reports reliably reflect the actual channel state, enabling the network to make accurate scheduling and resource allocation decisions
Solution Approach 2:
The patent implements a feedback mechanism where the network receives CQI reports from Redcap UE based on the modified parameter sets and uses this information to adjust transmission parameters. This closed-loop feedback ensures reliable communication by continuously adapting to channel conditions
Data Source
AI summary
A method for reporting a channel quality indication (CQI) is applied to a first type of terminal and includes: determining a CQI parameter set corresponding to the first type of terminal; and reporting the CQI according to the CQI parameter set.