Multi-Numerology Scheduling for URLLC and eMBB Resource Sharing
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Solution Overview
Problem
Existing wireless communication systems struggle to efficiently accommodate both low latency and latency tolerant UEs using the same time-frequency resources, particularly in scenarios where ultra-reliable low latency communication (URLLC) and enhanced mobile broadband (eMBB) coexist, as existing methods fail to provide adequate scheduling and resource allocation strategies.
Innovation Solution
The proposed solution involves configuring different numerologies for distinct bandwidth partitions and using scheduling information to allocate resources efficiently, allowing for both low latency and latency tolerant communications to share the same resources by employing a bitmap-based resource allocation mechanism that accounts for pre-emption and dynamic adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the same time-frequency resources are shared by both low latency UEs and latency tolerant UEs, then resource utilization efficiency is improved, but scheduling complexity increases and reliability deteriorates
Solution Approach 1:
The patent segments the bandwidth into multiple bandwidth parts, each configured with different numerologies suitable for different service types. This segmentation allows low latency URLLC traffic and latency tolerant eMBB traffic to be handled with appropriate parameters simultaneously, resolving the scheduling complexity issue while maintaining resource sharing
Solution Approach 2:
The patent implements dynamic resource allocation where the base station can dynamically assign different bandwidth parts and numerologies to different UEs or different resource blocks within the same time slot. This dynamic approach enables flexible adaptation to varying traffic demands while maintaining efficient resource utilization
2Adaptability or versatility
If multiple numerologies are configured for different bandwidth parts, then adaptability for different service types is improved, but system complexity increases
Solution Approach 1:
The patent creates a universal resource allocation framework where a single downlink control information message can allocate resources across multiple bandwidth parts with different numerologies. This multi-functionality allows the same scheduling mechanism to handle both URLLC and eMBB traffic efficiently without requiring separate scheduling systems
Solution Approach 2:
Different bandwidth parts are configured with locally optimized numerologies tailored to specific service requirements. For example, smaller subcarrier spacing may be used for eMBB in certain bandwidth parts while larger subcarrier spacing is used for URLLC in other bandwidth parts, allowing each service type to operate with optimal parameters in its designated region
3Loss of time
If dynamic resource allocation is implemented for low latency traffic, then latency is reduced, but reliability deteriorates due to pre-emption of scheduled resources
Solution Approach 1:
The patent implements preliminary resource allocation for eMBB traffic in the downlink control information, reserving specific resource blocks before URLLC traffic arrives. This preliminary action allows the system to quickly pre-empt only the necessary resources for low latency traffic while maintaining the scheduled resources for other UEs, thus reducing latency without completely compromising reliability
Solution Approach 2:
The patent incorporates feedback mechanisms where the base station monitors the impact of pre-emption on scheduled transmissions and adjusts future resource allocation decisions accordingly. This feedback loop helps maintain reliability by learning from past pre-emption events and optimizing resource allocation patterns to minimize negative impacts on latency tolerant traffic
Data Source
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AI summary
Systems and methods of transmitting and receiving resource allocations, and transmitting and receiving on the basis of such resource allocations, are provided. Scheduling information is transmitted from a network to a user equipment to schedule a downlink transmission resource, the scheduling information comprising a first field that schedules a first resource allocation and a second field that schedules resources for a second resource allocation. The first and set of resouces may be a first set of M symbols, and the second set of resources may be L--M symbols, where there are L symbols in a scheduling period. One of the sets of resources may be subject to pre-emption while the other set is not. The two sets of resources may use different numerologies, for example using different sub-carrier spacings.