Dynamic CQI Reporting on PUCCH and PUSCH
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Solution Overview
Problem
Current methods for managing channel quality reports in cellular communication networks, such as periodic CQI on PUCCH and a-periodic CQI on PUSCH, are inefficient, especially in scenarios with a large number of smartphones, leading to resource wastage and suboptimal modulation and coding schemes due to insufficient CQI information.
Innovation Solution
A method and radio network node configuration that sends specific messages to user equipment to manage the transmission of channel quality reports, allowing for flexible activation or deactivation of CQI reporting using downlink control information or MAC control elements, optimizing resource usage by sending reports only when necessary on uplink control channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If periodic CQI transmission is enabled on PUCCH, then CQI information is continuously available for channel adaptation, but PUCCH resources are excessively consumed
Solution Approach 1:
The patent implements periodic CQI transmission where UEs send CQI reports at configured periodic intervals on PUCCH resources. This ensures continuous channel quality information availability for the base station while controlling resource consumption through periodic rather than continuous transmission. The periodicity and resource allocation are configured by RRC signaling to balance information freshness with resource efficiency.
Solution Approach 2:
The patent introduces dynamic switching between periodic CQI on PUCCH and a-periodic CQI on PUSCH based on traffic conditions. When uplink data is present, the system dynamically transitions to a-periodic reporting on PUSCH, which combines CQI transmission with data transmission opportunities. This dynamic adaptation allows the system to optimize resource usage based on actual traffic patterns while maintaining CQI information availability.
2Quantity of substance
If a-periodic CQI reporting on PUSCH is activated, then PUCCH resources are saved, but CQI information may be delayed or insufficient for optimal modulation and coding schemes
Solution Approach 1:
The patent makes PUSCH serve dual functions: data transmission and CQI reporting. When uplink data is scheduled, the same PUSCH resources carry both user data and CQI reports, eliminating the need for separate dedicated CQI resources. This multi-functionality approach saves PUCCH resources while ensuring CQI information is captured alongside data transmissions, maintaining transmission performance through timely CQI availability.
Solution Approach 2:
The system dynamically selects between periodic CQI on PUCCH and a-periodic CQI on PUSCH based on uplink traffic conditions. When data traffic is present, a-periodic reporting on PUSCH is activated to save PUCCH resources. When no data traffic exists, periodic reporting on PUCCH ensures continuous CQI availability. This dynamic switching maintains transmission performance while optimizing resource usage based on actual traffic patterns.
3Speed
If all smartphones are maintained in RRC_CONNECTED state for always-on experience, then data transmission reaction time is reduced, but periodic resource consumption on PUCCH becomes unsustainable
Solution Approach 1:
The patent enables PUSCH to serve dual purposes as both data transmission channel and CQI reporting channel. This allows connected UEs to report channel quality information efficiently when uplink data is scheduled, reducing reliance on dedicated PUCCH resources. By making PUSCH multi-functional, the system can support large numbers of connected devices without proportionally increasing PUCCH resource consumption, making always-on connectivity more sustainable.
Solution Approach 2:
The system implements dynamic CQI reporting strategies that adapt to traffic conditions. For always-on devices with intermittent traffic, CQI reporting transitions from continuous periodic on PUCCH to event-triggered on PUSCH when data arrives. This dynamic approach maintains fast reaction times for active traffic while reducing periodic resource consumption during idle periods, enabling sustainable support for large numbers of connected smartphones.
Data Source
AI summary
A radio network node (110) and a method therein for managing transmission of at least one channel quality report and a user equipment (120) a method therein for handling transmission of at least one channel quality report are disclosed. The radio network node (110) sends, to the user equipment (120), a first message comprising information about at least one resource for use by the user equipment (120) when transmitting the at least one channel quality report. The radio network mode (110) sends, to the user equipment (120), a second message for activating, in the user equipment (120), the transmission of the at least one channel quality report. The radio network node (110) receives, from the user equipment (120), a first channel quality report of the at least one channel quality report. The first channel quality report is received on the at least one resource on an uplink control channel.