Dynamic CQI Reporting Cycle Switching for Uplink Overhead Reduction
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Solution Overview
Problem
The existing HSPA wireless communication systems face inefficiencies due to high uplink control channel overhead, primarily caused by frequent channel quality indicator (CQI) reporting, which occupies valuable spectrum and reduces data capacity, especially when CQI reports are unnecessary.
Innovation Solution
Implementing a method where user equipment (UE) switches between different CQI reporting cycles based on channel measurements, reducing the frequency of CQI reports by configuring two sets of parameters for reporting cycles, allowing the UE to adjust its reporting frequency dynamically or based on network commands, thereby minimizing unnecessary CQI transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequent CQI reporting is implemented to maintain good downlink efficiency, then the accuracy of data rate adaptation is improved, but the uplink control channel overhead increases and data capacity is reduced
Solution Approach 1:
The patent implements dynamic CQI reporting by allowing the UE to switch between different reporting cycles (first and second cycles) based on current channel conditions and data reception state. The network can configure multiple CQI reporting cycle values, and the UE dynamically selects which cycle to use, making the reporting frequency adaptive rather than fixed. This resolves the contradiction by adjusting reporting frequency dynamically - using frequent reporting when needed for accuracy and less frequent reporting when conditions allow, thereby reducing overall overhead while maintaining necessary measurement precision.
Solution Approach 2:
The patent changes the parameter of CQI reporting cycle length based on operational state. The network configures at least two different CQI reporting cycle values, and the system switches between these parameter values depending on whether data is being received and channel conditions. This parameter change approach allows the system to optimize between measurement accuracy and overhead by selecting appropriate reporting frequencies for different operational scenarios.
2Quantity of substance
If CQI reporting frequency is reduced to decrease uplink overhead, then more spectrum is available for data transmission, but downlink efficiency may deteriorate due to less accurate data rate adaptation
Solution Approach 1:
The dynamic switching mechanism ensures that CQI reporting frequency is reduced only when appropriate - specifically when no data is being received or when channel conditions are stable. When data transmission is active and channel conditions require frequent updates, the system switches to a shorter reporting cycle to maintain downlink efficiency. This dynamic adaptation resolves the contradiction by selectively reducing reporting frequency only in scenarios where it does not harm productivity.
Solution Approach 2:
The system uses multiple configurable CQI reporting cycle parameters and switches between them based on operational state. By having at least two different cycle values configured, the system can change the reporting frequency parameter to match current needs - using longer cycles to free up spectrum for data while using shorter cycles when downlink efficiency requires more frequent updates. This parameter flexibility resolves the contradiction between available spectrum and transmission efficiency.
3Loss of information
If the UE continuously reports CQI on the uplink control channel, then the network maintains accurate channel state information, but the uplink data capacity is reduced due to occupied control channel resources
Solution Approach 1:
The patent implements periodic CQI reporting with variable periods. Instead of continuous reporting, the UE reports CQI periodically according to configured cycles. The system can switch between different periodic intervals (first and second cycles) depending on whether data is being received and channel conditions. This periodic action with variable periods resolves the contradiction by providing channel state information at appropriate intervals without continuously occupying control channel resources, thereby preserving uplink data capacity.
Solution Approach 2:
The reporting periodicity is made dynamic through the ability to switch between different configured cycles. When uplink data capacity is critical, the system can extend the reporting period to minimize control channel usage. When channel conditions require more monitoring, the period can be shortened. This dynamic adjustment of reporting periodicity resolves the contradiction between maintaining accurate channel state information and preserving uplink data capacity.
Data Source
AI summary
A user equipment (UE) is configured with a first configuration for reporting measurement feedback information according to a first reporting cycle using a first set of parameters, and a second configuration for reporting measurement feedback information according to a second reporting cycle using a second set of parameters. The UE switches between the first cycle and the second cycle for reporting for example CQI based on for example comparing a data or a channel measurement against a predefined threshold. In various embodiments the second configuration is fixed, or results in no CQI reporting, or is variable based on a previous cycle or CQI level, or is event-based. In another embodiment, the network commands the UE to switch. The end result is that control signalling overhead can be reduced when appropriate by reducing the number of CQI reports that are sent uplink.