Single-Carrier Downlink Control Channel for Low-PAPR Coverage
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Solution Overview
Problem
In high-frequency NR technology beyond 52.6 GHz, power amplifiers with low power efficiency and low coverage are critical issues, and single carrier waveforms with low peak-to-average power ratio (PAPR) are necessary for downlink transmission, requiring improved methods for downlink control channel transmission and reception to reduce blind detection complexity and enhance coverage.
Innovation Solution
A method involving the determination of specific time-frequency resources for reference signals and downlink control channels, using predetermined parameters to associate reference signals with downlink control channels, reducing blind detection complexity and enhancing coverage through a single carrier based downlink control channel structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple time-frequency resources are allocated for downlink control channel to improve coverage, then coverage is improved, but blind detection complexity increases
Solution Approach 1:
The downlink control channel resources are segmented into multiple time-frequency resources, and the terminal device is configured to monitor only specific resources indicated by higher layer parameters. This segmentation allows coverage enhancement through resource distribution while reducing blind detection complexity by limiting the monitoring scope to predetermined resources.
Solution Approach 2:
The network device performs preliminary configuration by indicating specific time-frequency resources for downlink control channel monitoring through higher layer parameters before actual transmission. This preliminary action enables the terminal device to prepare its reception on predetermined resources, avoiding exhaustive blind detection across all possible resources while maintaining coverage through proper resource allocation.
2Loss of energy
If single carrier waveform is used to reduce PAPR, then power efficiency is improved, but control channel transmission flexibility is reduced
Solution Approach 1:
The patent introduces time-frequency resource dimension for single carrier based control channels. By configuring specific time-frequency resources through higher layer parameters, the system achieves transmission flexibility in the time-frequency domain while maintaining the low PAPR advantage of single carrier waveform in the signal domain.
Solution Approach 2:
The system changes the parameter of carrier structure from multiple carriers to single carrier, and compensates for reduced flexibility by introducing configurable time-frequency resource parameters through higher layer signaling. This parameter change approach maintains power efficiency while restoring adaptability through resource configuration.
Data Source
AI summary
Embodiments of the present disclosure relate to methods, devices and computer readable media for transmission and reception of DCI in a single carrier based downlink control channel. A method of communication comprises receiving, at a terminal device, a reference signal for a downlink control channel associated with the terminal device via a first time-frequency resource allocated for transmission of the reference signal; determining, from a set of second time-frequency resources allocated for the downlink control channel, a subset of second time-frequency resources based on the reference signal; and receiving DCI via the subset of second time-frequency resources. The method further comprises determining, at a network device, the first and second time-frequency resources; determining the reference signal based on the second time-frequency resource; and transmitting the reference signal and DCI via the first and second time-frequency resources respectively. Embodiments of the present disclosure can reduce the complexity on blind detection for the downlink control channel while supporting low PAPR and better coverage with a single carrier based downlink control channel structure.