Uplink Control and Data Channel Multiplexing via Variable Coding Rates
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Solution Overview
Problem
In wireless communication systems using SC-FDMA for uplink transmission, time-division multiplexing of control and data signals faces challenges in maintaining reception quality and managing Peak to Average Power Ratio (PAPR) when power ratios between signals are variable, and existing methods require the use of Data Associated Signals for demodulation.
Innovation Solution
A method where a wireless base station specifies and applies variable coding rates for control and data signals within a Transmit Time Interval (TTI) to ensure constant transmission power, allowing time-division multiplexing without degrading reception quality or increasing PAPR, and includes these coding rates in transmission parameters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If variable power ratio between data signal and control signal is used in TTI, then reception quality requirements can be satisfied, but PAPR greatly changes
Solution Approach 1:
The patent changes the parameter from power ratio to coding rate. Instead of varying the power ratio between data signal and control signal in TTI, the invention varies the coding rates while keeping the power ratio constant. This resolves the contradiction by achieving reception quality requirements through coding rate adjustment rather than power variation, thereby preventing PAPR changes.
2Object-generated harmful factors
If constant transmission power is maintained in TTI, then PAPR is reduced, but reception quality of control signal may deteriorate
Solution Approach 1:
The patent changes the parameter from power ratio to coding rate. Instead of varying the power ratio between data signal and control signal in TTI, the invention varies the coding rates while keeping the power ratio constant. This resolves the contradiction by achieving reception quality requirements through coding rate adjustment rather than power variation, thereby preventing PAPR changes.
3Ease of operation
If Data Associated Signal is used for demodulation, then data signal can be demodulated, but system complexity increases
Solution Approach 1:
The patent extracts the demodulation function from the Data Associated Signal and implements it through conventional pilot signals. By separating the demodulation function from the data-carrying signal and assigning it to dedicated pilot signals, the system achieves demodulation capability without requiring complex Data Associated Signal processing.
Data Source
AI summary
A communication method in a wireless communication system, includes transmitting, from a base station to a mobile station, transmission parameters, and by the mobile station, encoding a control channel and a data channel based on the transmission parameters, multiplexing, after coding, the control channel and the data channel, and transmitting the multiplexed control channel and data channel.