UL QoS Scheduling With Proactive Grants for High-Priority QFIs
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Solution Overview
Problem
Existing 5G networks face challenges in efficiently managing UpLink (UL) transmission grants, particularly in ensuring reliable and stable network performance for varying Quality of Service (QoS) flows, leading to potential interruptions and inefficiencies in resource allocation.
Innovation Solution
Implementing a Service Data Adaptation Protocol (SDAP) and QoS-based proactive scheduling system that determines UE modes and maps QoS flows to Data Radio Bearers, prioritizing higher priority QFIs for proactive grants and using dynamic scheduling for lower priority QFIs, while preventing resource shortages and idle UE transmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If proactive scheduling is implemented for high priority QFIs, then network stability and QoS delivery are improved, but system complexity increases
Solution Approach 1:
The scheduling system is segmented into two distinct parts: proactive scheduling for high priority QFIs (1-3) and dynamic scheduling for lower priority QFIs (4-6). This segmentation allows each scheduling mechanism to be optimized independently, managing complexity while ensuring reliable QoS delivery for critical flows.
Solution Approach 2:
The system performs preliminary actions by proactively allocating UL transmission grants to UEs with high priority QFIs before actual data transmission needs arise. This advance preparation ensures that when high priority data needs to be transmitted, resources are already reserved, improving network stability and QoS reliability.
2Productivity
If UL transmission grants are allocated to connected UEs, then data transmission capability is improved, but resource waste occurs when UEs have nothing to send
Solution Approach 1:
The system applies partial action by selectively providing proactive grants only to connected UEs with high priority QFIs, rather than universally to all connected UEs. This selective approach maintains data transmission capability for UEs that need it while avoiding resource waste on UEs with no data to send.
Solution Approach 2:
The scheduling system incorporates feedback mechanisms where the gNB monitors UE states and QoS requirements, adjusting grant allocations dynamically. This feedback loop ensures grants are provided to connected UEs only when necessary, balancing transmission capability with resource efficiency.
3Adaptability or versatility
If dynamic scheduling is used for all UEs, then resource allocation flexibility is improved, but QoS enforcement for high priority flows deteriorates
Solution Approach 1:
Different scheduling qualities are applied to different QoS flows: high priority QFIs (1-3) receive proactive scheduling with guaranteed resource allocation, while lower priority QFIs (4-6) receive dynamic scheduling. This local quality differentiation ensures QoS enforcement for critical flows while maintaining overall system flexibility.
Solution Approach 2:
The system performs preliminary QoS enforcement actions by reserving resources for high priority flows in advance through proactive scheduling. This preliminary action ensures that when high priority data needs transmission, QoS requirements are already satisfied, unlike pure dynamic scheduling where QoS may be compromised by competing traffic.
4Reliability
If PDCCH space is reserved for proactive grants, then UL transmission reliability is improved, but PDCCH resource availability for other control signals decreases
Solution Approach 1:
PDCCH resources are segmented into dedicated slots for proactive grants and remaining slots for dynamic scheduling and other control signals. This segmentation ensures sufficient PDCCH space is allocated for proactive grants to maintain UL transmission reliability, while preserving adequate resources for other control functions.
Solution Approach 2:
The system applies partial action by allocating only the necessary portion of PDCCH resources to proactive grants, rather than dedicating all PDCCH capacity to this function. This partial allocation maintains UL transmission reliability for high priority flows while preserving sufficient PDCCH resources for dynamic scheduling and other control signals.
Data Source
AI summary
Systems and methods for Service Data Adaptation Protocol (SDAP) and Quality of Service (QoS) based proactive scheduling for UpLink (UL) transmission grants. One such method includes: determining, using a primary gNB that acts as a scheduler, which UEs are in an idle mode and which UEs are in a connected mode; mapping, using SDAP layers, the QoS flow to Data Radio Bearers (DRBs) from the primary gNB for UEs that are in the connected mode, wherein QoS flow packets are classified and marked using a QoS flow identifier (QFI); targeting, using the scheduler, UEs with a higher priority QFI for selection before UEs with a lower priority QFI; providing proactive grants of UL transmissions to the selected UEs with a higher priority QFI; and providing grants of UL transmissions to the UEs with a lower priority QFI using dynamic scheduling.