Preemption Indications for Dynamic Multiplexing
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Solution Overview
Problem
Current New Radio (NR) wireless communication systems face challenges in efficiently multiplexing enhanced Mobile Broadband (eMBB) and ultra-reliable and low latency communications (URLLC) services within the same spectrum, due to differing latency requirements, leading to inefficiencies and peak data rate losses.
Innovation Solution
Implementing dynamic multiplexing by configuring access nodes to preempt ongoing eMBB transmissions with URLLC transmissions in time-frequency resources, using preemption indications to assist user equipment in proper signal combining, and employing advanced signaling techniques to manage time-frequency resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If semi-static partitioning of resources in time domain is used to allocate certain resources for URLLC and eMBB, then resource allocation is simplified, but efficiency and peak data rate are reduced
Solution Approach 1:
The patent implements dynamic resource allocation where URLLC transmissions can preempt eMBB resources in real-time based on actual traffic demands and latency requirements. The network device dynamically determines which eMBB resources to puncture for URLLC transmissions, allowing the system to adapt resource allocation to changing conditions rather than using fixed semi-static partitioning.
Solution Approach 2:
The patent changes the allocation parameters dynamically by adjusting the amount and timing of resource preemption based on URLLC traffic arrival patterns and eMBB service quality requirements. The system modifies resource allocation parameters in real-time to optimize both URLLC latency performance and eMBB throughput, rather than maintaining fixed allocation ratios.
2Productivity
If frequency domain multiplexing is used for eMBB and URLLC services, then spectral efficiency is improved, but latency requirements cannot be met due to different service characteristics
Solution Approach 1:
The patent transitions from purely frequency domain multiplexing to a combined time-frequency domain approach. By introducing time domain preemption capabilities, the system adds a temporal dimension to resource allocation, allowing URLLC to immediately access resources when needed while eMBB continues to utilize allocated frequency resources, thus meeting stringent latency requirements while maintaining spectral efficiency.
Solution Approach 2:
The patent segments the resource allocation into different priority levels, where URLLC transmissions are given higher priority and can preempt eMBB resources when necessary. This segmentation allows the system to maintain frequency domain multiplexing for spectral efficiency while enabling time-critical URLLC services to break through frequency allocation constraints when latency requirements demand immediate transmission.
3Loss of time
If time domain multiplexing is used for eMBB and URLLC services, then latency requirements are met, but spectral efficiency decreases due to separate resource allocation
Solution Approach 1:
The patent merges frequency domain multiplexing and time domain preemption into a unified resource allocation framework. eMBB and URLLC services share the same frequency resources through frequency domain multiplexing, while time domain preemption mechanisms allow URLLC to dynamically access resources when latency requirements arise. This combination achieves both spectral efficiency through frequency sharing and low latency through time-critical preemption.
Data Source
AI summary
Embodiments of dynamic multiplexing are described, including the transmission of preemption indication (PI) to indicate preemption of time-frequency resources. In some embodiments, a next Generation NodeB (gNB) is configured to transmit PIs in signaling to preempt an enhanced Mobile Broadband (eMBB) communications transmission with an ultra-reliable and low latency communications (URLCC) transmission. In some embodiments, a user equipment (UE) is configured to monitor a region of time-frequency resources, within a bandwidth part (BWP), for a PI. The PI indicates to the UE a portion of time-frequency resources that omit transmissions intended for the UE. In some embodiments, the gNB transmits the PI to the UE within preemption indication downlink control information (PI-DCI) in a physical downlink control channel (PDCCH) in a control resource set (CORESET). In some embodiments, the BWP is defined according to a frequency domain location, a bandwidth, and a subcarrier spacing for a given numerology.