UE Capability Signaling to Skip Symbol Blanking
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Solution Overview
Problem
Symbol blanking in 5G RF communication systems degrades throughput performance and latency, particularly in Ultra-Reliable Low Latency Communication (URLLC) use cases, due to the requirement of blanking one OFDM symbol out of two, leading to severe latency and throughput penalties, and prevents radio access network (RAN) from configuring SRS Antenna Switching (SRS-AS) in certain slot configurations.
Innovation Solution
The proposal involves UE signaling its supported transient time parameters to the base station, allowing the scheduler to determine if symbol blanking is necessary, and introducing signaling capabilities to indicate support for shorter transients and the ability to skip symbol blanking for consecutive SRS transmissions and short sub-slot transmissions, utilizing RF front-end architectures and power amplifier control techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If symbol blanking is implemented to accommodate RF transient periods, then RF signal stability is improved, but 5G throughput and latency performance deteriorate
Solution Approach 1:
The patent changes the RF transient period parameter from the standard 10 μs to a shorter duration (e.g., 5 μs or less) through modified power amplifier control techniques. This parameter change allows the RF front-end to stabilize faster, reducing or eliminating the need for symbol blanking while maintaining signal stability, thereby improving throughput performance without sacrificing reliability
2Reliability
If symbol blanking is implemented to accommodate RF transient periods, then RF signal stability is improved, but latency increases
Solution Approach 1:
By reducing the RF transient period parameter through advanced power amplifier control, the patent enables faster RF signal stabilization. This eliminates the time loss associated with symbol blanking, directly reducing latency while maintaining the necessary RF signal stability for reliable communication
3Reliability
If symbol blanking is implemented for SRS transmissions, then RF transient requirements are met, but SRS Antenna Switching configuration is prevented
Solution Approach 1:
The patent reduces the RF transient period parameter to fit within the duration of available OFDM symbols, eliminating the need for symbol blanking. This enables the RAN to configure SRS Antenna Switching in special slot configurations (such as 10:2:2) without losing symbols, thereby maintaining both RF transient compliance and antenna switching versatility
4Adaptability or versatility
If standard RF transient period (10 μs) is used, then all use cases are supported, but a large portion of OFDM symbol is lost
Solution Approach 1:
The patent changes the RF transient period parameter from 10 μs to a shorter duration through modified power amplifier control techniques. This reduced transient period fits within the OFDM symbol duration even at high subcarrier spacings (e.g., 60 kHz), preventing symbol loss while maintaining support for all 5G use cases including URLLC
Data Source
AI summary
A mobile device having a capability of skipping symbol blanking, the mobile device comprising a transceiver, a radio frequency front end system coupled to the transceiver and a baseband system configured to generate a sequence of symbols for transmission to a base station by way of the radio frequency front end system coupled to the transceiver, and to generate a sequence of symbols including capability information, the capability information indicating that the mobile device has the capability of skipping symbol blanking.