Dynamic Bandwidth Indication for NR Unlicensed Spectrum Interference
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Solution Overview
Problem
In new radio (NR) systems operating on unlicensed spectrum, there is a challenge in ensuring fair coexistence with incumbent technologies like Wi-Fi, particularly in wideband transmissions, where the absence of interference information leads to vulnerability to in-band interference due to unawareness of successful Listen-Before-Talk (LBT) sub-bands by receiving nodes.
Innovation Solution
Implementing dynamic bandwidth indication mechanisms, such as bitmaps or specific coding schemes, to inform receiving nodes about the exact transmission bandwidth used after successful LBT, allowing them to adjust their RF settings and avoid interference from unsuccessful sub-bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wideband transmission is used in NR systems on unlicensed spectrum, then data throughput and communication efficiency are improved, but vulnerability to in-band interference increases due to lack of interference information at receiving nodes
Solution Approach 1:
The patent implements a feedback mechanism where the transmitting node sends LBT success information (indicating which sub-bands achieved successful Listen-Before-Talk) to the receiving node. This feedback enables the receiving node to adjust its reception parameters and avoid interference from unsuccessful sub-bands, thereby resolving the contradiction between wideband transmission throughput and communication reliability.
2Adaptability or versatility
If dynamic bandwidth adaptation is implemented, then spectrum utilization efficiency is improved, but system complexity increases due to additional signaling and coordination requirements
Solution Approach 1:
The patent segments the wideband transmission into multiple sub-bands and performs LBT independently on each sub-band. This segmentation allows dynamic bandwidth adaptation where only successful sub-bands are transmitted, improving spectrum utilization efficiency while managing system complexity through modular, independent sub-band handling.
Data Source
AI summary
A network device (e.g., a user equipment (UE), a new radio NB (gNB), or other network component) can process or generate a dynamic indication that indicates a transmission bandwidth based on a wideband bandwidth. One or more downlink (DL) signals can be provided with the indication of the transmission bandwidth that enables a tuning of communications within the wideband bandwidth based on the indication for new radio (NR) communications in heterogeneous network domains ranging from Enhanced Mobile Broadband (eMBB) to massive Machine-Type Communications (mMTC) and Ultra-Reliable Low-Latency Communications (URLLC) or the like.