5G-NR Reference Signal Design for mmWave Interference Management
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Solution Overview
Problem
Current wireless communication systems face challenges in operating efficiently above 52.6 GHz carrier frequencies, particularly in designing reference signals and managing interference and bandwidth for 5G new radio (NR) networks, especially in unlicensed spectrum and vehicle-to-everything (V2X) communications.
Innovation Solution
The development of novel reference signal designs and channel access mechanisms that include reconfigurable bandwidth and center frequency for sidelink transmissions, UCI piggybacking for grant-free and grant-based NOMA uplink transmissions, and mechanisms to mitigate intercell blocking and interference in NR systems operating on unlicensed spectrum, enhancing resource allocation and HARQ-ACK transmission in NR systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reference signals are designed for operation above 52.6 GHz carrier frequency, then communication capability at mmWave frequencies is improved, but system complexity and interference management difficulty increase
Solution Approach 1:
The reference signal design is segmented into different types (e.g., CSI-RS, SRS, DM-RS) with specific configurations for different frequency ranges. Above 52.6 GHz, the system uses simplified reference signal patterns with reduced density compared to lower frequencies, dividing the complex mmWave communication task into manageable signal components that can be handled separately.
Solution Approach 2:
The patent applies parameter changes by adjusting reference signal bandwidth, density, and frequency spacing specifically for operation above 52.6 GHz. The reference signal bandwidth is reduced and spacing is increased to account for higher path loss and limited bandwidth availability at mmWave frequencies, while maintaining compatibility with existing 5G NR frameworks.
2Productivity
If reconfigurable bandwidth and center frequency are implemented for sidelink transmissions, then spectral efficiency is improved, but control signaling overhead increases
Solution Approach 1:
The patent merges the bandwidth and center frequency configuration into a single reconfigurable resource allocation mechanism for sidelink transmissions. Instead of separate control signals for each parameter, the system uses unified resource indication values (RIV) that encode both bandwidth and frequency position, reducing control overhead while maintaining full reconfigurability.
Solution Approach 2:
The sidelink resource allocation mechanism is designed to be universal, handling both unlicensed and licensed spectrum operations with the same reconfigurable bandwidth and center frequency framework. This multi-functional approach eliminates the need for separate control signaling paths for different spectrum types, reducing overall overhead.
3Productivity
If UCI piggybacking is used for grant-free and grant-based NOMA uplink transmissions, then uplink efficiency is improved, but interference management complexity increases
Solution Approach 1:
The system performs preliminary action by pre-configuring UCI piggybacking resources and power allocation coefficients before NOMA transmissions occur. The gNB pre-assigns specific resource elements for UCI multiplexing and determines power splitting ratios in advance, allowing UCI to be piggybacked on uplink data transmissions without real-time interference coordination, thus improving uplink efficiency while managing complexity through advance planning.
4Reliability
If mechanisms to mitigate intercell blocking and interference are implemented in NR systems operating on unlicensed spectrum, then connection reliability is improved, but protocol complexity increases
Solution Approach 1:
The patent converts the harmful effect of intercell interference in unlicensed spectrum into a beneficial mechanism by using interference measurement resources (IMR) and channel state information (CSI) feedback. The system deliberately allows interference to occur and then uses measured CSI to perform coordinated beamforming and power control, transforming the interference problem into a basis for improved connection reliability through intelligent resource allocation.
Data Source
AI summary
A user equipment (UE) can include processing circuitry coupled to memory. To configure the UE for New Radio (NR) communications above a 52.6 GHz carrier frequency, the processing circuitry is to decode radio resource control (RRC) signaling to obtain a cyclic shift value in time domain. The cyclic shift value is associated with a demodulation reference signal (DM-RS) antenna port (AP) of a plurality of available DM-RS APs. A single carrier based waveform DM-RS sequence corresponding to the DM-RS AP is generated using a base sequence and the cyclic shift value. The single carrier based waveform DM-RS sequence is encoded with uplink data for transmission to a base station using a physical uplink shared channel (PUSCH) using a carrier above the 52.6 GHz carrier frequency.