URLLC PDCP Duplication via Dual LBT Bandwidths
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Solution Overview
Problem
Current wireless communication systems face challenges in achieving ultra-reliable low-latency communications (URLLC) in unlicensed spectrum bands, particularly due to unpredictable interference and limited availability of licensed spectrum, which affects quality-of-service and overall capacity.
Innovation Solution
The implementation of advanced wireless communication technologies, such as 5G New Radio (NR) and Long-Term Evolution (LTE) systems, that utilize Listen-Before-Talk (LBT) channel access procedures and dynamic frequency selection to efficiently manage unlicensed spectrum, ensuring fair sharing with other systems and maintaining quality-of-service through adaptive bandwidth management and beamforming techniques.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Listen-Before-Talk (LBT) channel access procedures are implemented in unlicensed bands, then fair spectrum sharing with other systems is improved, but communication reliability and latency performance deteriorate due to unpredictable interference
Solution Approach 1:
The patent segments URLLC traffic into two separate channels: licensed spectrum for critical URLLC communications requiring high reliability and low latency, and unlicensed spectrum for enhanced capacity and data rates. This segmentation allows LBT to be applied only to the unlicensed channel, improving spectrum sharing while preserving URLLC performance through the dedicated licensed channel.
Solution Approach 2:
The patent introduces a dual-spectrum dimension (licensed and unlicensed bands) to handle different traffic requirements. By operating in two frequency dimensions simultaneously, the system achieves fair spectrum sharing in unlicensed bands while maintaining reliable URLLC service in licensed bands, effectively resolving the contradiction between adaptability and reliability.
2Productivity
If unlicensed spectrum is utilized to enhance capacity and user data rates, then overall network capacity is improved, but quality-of-service deteriorates due to limited availability and unpredictable interference
Solution Approach 1:
The patent segments network traffic into enhanced mobile broadband (EMB) for capacity enhancement in unlicensed spectrum and URLLC for quality-of-service critical communications in licensed spectrum. This segmentation enables the system to exploit the high capacity potential of unlicensed bands while protecting QoS-sensitive traffic in the reliable licensed band.
Solution Approach 2:
The patent implements dynamic resource allocation where the system can flexibly switch between licensed and unlicensed spectrum based on traffic conditions and requirements. When URLLC traffic arrives, the system dynamically prioritizes licensed spectrum resources, while EMB traffic utilizes unlicensed spectrum for capacity enhancement, achieving both high productivity and maintained reliability.
3Productivity
If dynamic frequency selection is used to manage unlicensed spectrum, then fair sharing and capacity are improved, but system complexity increases due to adaptive bandwidth management and beamforming requirements
Solution Approach 1:
The patent segments the system into two distinct operational modes corresponding to licensed and unlicensed spectrum. The unlicensed mode implements LBT and dynamic frequency selection for fair sharing and capacity enhancement, while the licensed mode provides simplified, reliable access. This segmentation confines complexity to only where needed (unlicensed band management) while maintaining simplicity for critical communications.
Data Source
AI summary
A wireless device may receive configuration parameters of PDCP duplication of a bearer. A first RLC entity of the bearer may be associated with a first LBT bandwidth. A second RLC entity of the bearer may be associated with a second LBT bandwidth. The wireless device may transmit a packet of the bearer via the first LBT bandwidth and may transmit a duplicate of the packet via the second LBT bandwidth.