PDCCH Structure for 5G mmWave Coverage Extension
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Solution Overview
Problem
Current 5G communication systems face challenges in maintaining effective PDCCH coverage beyond 52.6 GHz frequencies due to increased path loss, noise limitations, and inefficiencies in power amplifiers, which affect link budget and thermal noise levels, making it difficult to support high-capacity applications and mmWave scenarios.
Innovation Solution
The implementation of single carrier-based PDCCH waveforms with extended transmission time intervals, variable aggregation levels, and optimized DMRS densities, along with the use of multiple CORESETs and polar coding, to enhance processing gain, reduce thermal noise, and improve link budget in thermal noise-limited scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single carrier-based PDCCH waveforms with extended transmission time intervals are implemented, then processing gain is enhanced and thermal noise is reduced, but device complexity increases
Solution Approach 1:
The patent changes the waveform parameters from traditional OFDM to single carrier-based waveforms with extended transmission time intervals. This parameter change increases processing gain by extending the integration time and reduces thermal noise through longer observation intervals, directly improving PDCCH coverage in high-frequency scenarios
Solution Approach 2:
The patent introduces variable aggregation levels for PDCCH candidates, allowing the system to dynamically adjust the number of CCEs used for different DCI payloads. This dynamic adaptation optimizes resource utilization while maintaining reliable detection under varying channel conditions and coverage requirements
2Productivity
If higher frequencies (mmWave bands) are used for high-capacity applications, then spectrum allocation efficiency is improved, but path loss increases and coverage is reduced
Solution Approach 1:
The patent extends transmission time intervals for PDCCH at higher frequencies, which increases processing gain to compensate for the increased path loss inherent in mmWave bands. This parameter extension allows the system to maintain coverage while utilizing high-capacity spectrum allocations
Solution Approach 2:
The patent employs multiple CORESETs that can be distributed across different time and frequency resources, ensuring continuous monitoring opportunities for PDCCH. This continuity allows the system to maintain reliable control channel operation despite the challenges of high-frequency propagation
3Reliability
If power amplifier output power is increased to maintain coverage, then link budget is improved, but thermal noise and power efficiency deteriorate
Solution Approach 1:
The patent extends the transmission time interval for PDCCH, which increases processing gain and allows for lower transmission power while maintaining the same coverage. This parameter change improves power amplifier efficiency by reducing the required output power while compensating for path loss through longer integration times
4Adaptability or versatility
If variable aggregation levels are implemented for PDCCH candidates, then resource allocation flexibility is improved, but detection complexity increases
Solution Approach 1:
The patent implements variable aggregation levels where the number of CCEs used for PDCCH candidates can be dynamically adjusted based on the DCI payload size and channel conditions. This dynamic approach provides flexible resource allocation while the UE searches through a configured set of aggregation levels to detect the appropriate PDCCH
Data Source
AI summary
According to a first embodiment, a method may include receiving, by a user equipment, a first physical downlink control channel (PDCCH) configuration from a network entity. The method may further include detecting, by the user equipment, at least one PDCCH based on the first PDCCH configuration. The method may further include transmitting and/or receiving, by the user equipment, at least one signal based on the at least one detected PDCCH.