Control-Data Channel Multiplexing with Symbol Spreading
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Solution Overview
Problem
Existing wireless communication systems face challenges in achieving power and spectral efficiency in the transmission of control and data channels, particularly in dynamic scheduling scenarios where both network entities and user equipment activate multiple baseband and radio frequency devices, leading to inefficiencies in power consumption and spectral utilization.
Innovation Solution
The proposed solution involves transmitting a multiplexed combination of control and data channels, mapped to resource elements in a time-frequency resource grid, utilizing symbol-level spreading and hierarchical modulation techniques such as constellation scaling and rotation, to enhance efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If control channel and data channel are transmitted separately using different channel codings and modulation formats, then transmission reliability is improved, but spectral efficiency deteriorates
Solution Approach 1:
The patent merges control channel and data channel into a unified transmission framework using non-orthogonal multiple access (NOMA). Both channels share the same time-frequency resources through power domain multiplexing, where control information and data are superimposed with different power allocation coefficients. This combining approach enables simultaneous transmission of control and data without requiring separate orthogonal resources, thereby improving spectral efficiency while maintaining transmission reliability through successive interference cancellation (SIC) at the receiver.
2Adaptability or versatility
If multiple baseband and radio frequency devices are activated for dynamic scheduling, then transmission capability is improved, but power consumption increases
Solution Approach 1:
The patent implements discontinuous reception (DRX) mechanisms combined with wake-up signals (WUS) to enable periodic activation of baseband and radio frequency devices. Instead of continuous operation, devices are activated only during scheduled transmission intervals defined by DRX cycles. Wake-up signals are used to trigger immediate activation when data arrives, allowing devices to remain in low-power states during idle periods while maintaining transmission capability when needed, thus reducing overall power consumption while preserving adaptability.
3Reliability
If control and data channels use different modulation formats, then transmission robustness is improved, but device complexity increases
Solution Approach 1:
The patent employs unified modulation and coding schemes for both control and data channels within the NOMA framework, rather than using different modulation formats. By changing the parameter approach from format differentiation to power domain differentiation, the system achieves transmission robustness through power allocation optimization and SIC processing rather than through diverse modulation schemes. This parameter change simplifies device complexity by standardizing the modulation processing while maintaining robustness through adaptive power control and interference cancellation mechanisms.
Data Source
AI summary
An apparatus transmits a multiplexed combination of a control channel and a data channel that is mapped to at least one resource element in a time-frequency resource grid. Before transmission, the apparatus modulates a plurality of coded bits of the control channel using a first modulation scheme to obtain a plurality of control channel symbols, spread the plurality of control channel symbols using a first spreading code to obtain a spread plurality of control channel symbols, modulates a plurality of coded bits of the data channel using a second modulation scheme to obtain a plurality of data channel symbols, spread the plurality of data channel symbols using a second spreading code to obtain a spread plurality of data channel symbols, and multiplexes the spread plurality of control channel symbols with the spread plurality of data channel symbols to obtain the multiplexed combination of the control channel and the data channel.