Dynamic Resource Allocation for Low Latency Wireless Coexistence
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently coexisting with both low latency and latency-tolerant communications within shared time-frequency resources, leading to suboptimal resource utilization and potential delays in critical applications.
Innovation Solution
The method involves postponing latency-tolerant transmissions to free up resources for low latency transmissions by aligning shorter data transmissions with integer numbers of OFDM symbols, allowing for dynamic sub-band bandwidth adjustments and different numerologies to be used for different traffic types, enabling slot and symbol-based coexistence in the same time-frequency resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If latency tolerant transmissions are prioritized in shared time-frequency resources, then resource utilization is improved, but low latency transmissions experience delays
Solution Approach 1:
The system dynamically adjusts resource allocation between latency tolerant and low latency transmissions based on real-time traffic conditions. The base station can flexibly reassign time-frequency resources from latency tolerant traffic to low latency traffic when needed, rather than using static resource partitioning. This dynamic approach allows the system to maintain high resource utilization while responding to urgent low latency requirements.
Solution Approach 2:
The system performs preliminary scheduling of latency tolerant transmissions, allowing the base station to identify and reserve resources for these transmissions in advance. When low latency traffic arrives, the base station can quickly determine which pre-scheduled latency tolerant transmissions can be postponed or cancelled, enabling fast response to low latency requirements without compromising overall resource utilization.
2Productivity
If time-frequency resources are shared between low latency and latency tolerant communications, then resource efficiency is improved, but transmission reliability for low latency communications deteriorates
Solution Approach 1:
The system segments time-frequency resources into different regions: some resources are dedicated to low latency transmissions while others are shared with latency tolerant transmissions. This segmentation ensures that low latency transmissions always have guaranteed resources for reliable delivery, while latency tolerant transmissions can utilize additional shared resources when available, achieving both high reliability and resource efficiency.
Solution Approach 2:
Different quality levels of service are provided to different traffic types within the same resource pool. Low latency transmissions receive priority treatment with guaranteed resource allocation and higher reliability protection, while latency tolerant transmissions accept lower priority and can be postponed or cancelled. This local quality differentiation ensures that each traffic type receives appropriate service quality while maintaining overall resource efficiency.
Data Source
AI summary
Some user equipments (UEs) served by a base station may need to receive data from the base station and/or transmit data to the base station with lower latency than other UEs. It is desired to accommodate the presence of both low latency and latency tolerant communications in shared time-frequency resources to try to improve resource utilization. Embodiments are disclosed in which low latency and latency tolerant communications coexist in the same time-frequency resources. In some embodiments, a latency tolerant transmission is postponed to free resources to send a low latency transmission.