Radio Transmission Device Adaptive CQI Table Selection
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Solution Overview
Problem
In communication systems, the existing adaptive modulation techniques for control channels result in wasted radio resources when the reception environment is not poor, leading to decreased data channel throughput due to overly conservative Spectral Efficiency (SE) settings.
Innovation Solution
A radio transmitting apparatus and method that dynamically switch associations between channel quality indicators and modulation and coding schemes, allowing for more efficient allocation of resources by determining a modulation and coding scheme for the control channel based on the radio communication terminal's parameters, thereby optimizing resource use for the data channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conservative Spectral Efficiency settings are used for control channels to ensure reliable transmission in poor reception environments, then control channel reliability is improved, but radio resources are wasted leading to decreased data channel throughput
Solution Approach 1:
The patent applies dynamics by making the control channel SE configurable and switchable between different modes (robust mode with lower SE for poor reception environments, and efficient mode with higher SE for favorable environments). This allows the system to adapt the control channel's Spectral Efficiency dynamically based on reception conditions and terminal capabilities, rather than using a fixed conservative setting, thereby resolving the contradiction between reliability and resource efficiency.
2Ease of manufacture
If fixed Spectral Efficiency associations between CQIs and modulation schemes are used for control channels, then implementation simplicity is maintained, but resource allocation flexibility is reduced leading to suboptimal throughput
Solution Approach 1:
The patent introduces dynamic configurability of control channel SE through network side configuration messages that allow switching between different SE associations or modes. This maintains implementation simplicity through standardized configurations while adding the flexibility to optimize resource allocation based on actual channel conditions, resolving the contradiction between ease of implementation and resource allocation flexibility.
Data Source
AI summary
A radio transmitting device and method enables reduction of an increase of CQI memories for the control channel and an improvement of the throughput of the data channel. When multiplex transmission through the control channel and the data channel is carried out and when adaptive modulation is applied to both channels, an MCS selecting section (108) is provided with one CQI table for the data channel and CQI tables for the control channel, and a table selecting MCS determining section (201) selects one of the tables depending on the transmission bandwidth of the terminal and determines the MCS of the control channel while looking up the selected CQI table.