Adapting Modulation Coding Schemes Using Actual Radio Conditions
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Solution Overview
Problem
In radio communication networks, especially in LTE evolution of UMTS, the adaptation of modulation and coding schemes based on biased block error rate (BLER) measurements leads to suboptimal data transmission, as mobile terminals cannot simultaneously receive broadcast data and paging information, resulting in biased BLER measurements and neglecting other restrictions.
Innovation Solution
A device with processing means that adapts modulation and coding schemes based on actual radio broadcast conditions, using measurements from radio terminals, such as CQI and BLER, and accounting for restrictions like DRX cycles, transmitted over the backward channel without systematic acknowledgment, to ensure accurate radio propagation conditions are considered.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If radio terminals successively tune to different carriers including dedicated carrier in DRX cycles, then radio terminals can receive broadcast data and paging information, but BLER measurements become biased and not representative of actual radio conditions
Solution Approach 1:
The patent extracts and separates the measurement of radio conditions from the biased BLER measurements obtained during DRX cycles. By using dedicated measurement channels and separating measurement timing from data reception timing, the system obtains accurate radio condition measurements without the contamination from missed pages or incomplete data reception that biases BLER measurements.
Solution Approach 2:
The patent introduces intermediary measurement mechanisms that mediate between the terminal's need to receive both broadcast data and paging information, and the network's need for accurate radio condition measurements. These intermediaries include dedicated measurement channels and processed measurement reports that provide accurate CQI and radio condition data independent of the biased BLER measurements.
2Adaptability or versatility
If radio terminals are forced to successively tune to different carriers, then terminals can access both broadcast service and other network functions, but transmission quality deteriorates due to biased measurements
Solution Approach 1:
The patent implements feedback mechanisms where terminals transmit accurate radio condition measurements (CQI, signal strength) back to the network independently of their reception status. This feedback loop allows the network to adjust modulation and coding schemes based on actual radio conditions rather than biased BLER data, improving transmission reliability while maintaining terminal access capability.
Solution Approach 2:
The patent performs preliminary measurement of radio conditions before actual data transmission occurs. By measuring and reporting accurate radio conditions in advance through dedicated channels, the network can pre-adjust transmission parameters to optimize quality before the actual broadcast transmission begins, rather than reacting to biased post-transmission BLER measurements.
3Adaptability or versatility
If network adapts modulation and coding schemes based on biased BLER measurements, then network can respond to terminal conditions, but adaptation becomes suboptimal and harmful
Solution Approach 1:
The patent replaces the mechanical feedback loop based on biased BLER measurements with a more sophisticated measurement and feedback system. Instead of relying on the simple and biased BLER metric, the system substitutes accurate radio condition measurements (signal strength, CQI from dedicated channels) to drive modulation and coding scheme adaptation, eliminating the harmful feedback loop that caused suboptimal performance.
Data Source
AI summary
A device is dedicated to adapting modulation and coding schemes to be applied to data intended to be broadcast by means of a dedicated carrier over a forward channel of a radio communication network to radio terminals (UE) connected to at least that radio communication network. This device (D) comprises processing means (PM) tasked with adapting at least one modulation and coding scheme to be applied to data intended to be broadcast by means of the dedicated carrier, based on actual radio broadcast conditions, over links established between the radio network and radio terminals (UE) which are recipients of the data to be broadcast.