Base Station Opportunistic Scheduling for Low Latency Resources
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Solution Overview
Problem
Wireless communication systems face challenges in co-existence of low latency and latency-tolerant downlink communications, where resources allocated for low latency UEs and latency-tolerant UEs overlap, leading to inefficient use of time-frequency resources and potential interference.
Innovation Solution
A base station opportunistically schedules latency-tolerant data on reserved low latency resources, using signaling to indicate modifications, allowing for puncturing of latency-tolerant transmissions to accommodate newly arrived low latency data, thereby optimizing resource utilization and minimizing latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If resources are reserved for low latency data transmission, then low latency requirements are met, but resource utilization efficiency deteriorates when low latency data is not always available
Solution Approach 1:
The patent implements dynamic resource allocation where latency-tolerant data can be scheduled on low latency resources when no low latency data is available, and the allocation changes when low latency data arrives. This is achieved through opportunistic scheduling that monitors resource availability and dynamically adjusts which data type occupies the reserved resources, resolving the contradiction between maintaining low latency guarantees and maximizing resource utilization.
Solution Approach 2:
The system changes the state of resource allocation parameters based on data arrival conditions. When low latency data is absent, the resources transition from being exclusively reserved to being available for latency-tolerant data. When low latency data arrives, the parameters switch back to priority allocation. This dynamic parameter changing enables the system to adapt resource usage to actual traffic conditions.
2Productivity
If latency tolerant data is scheduled on low latency resources, then resource efficiency improves, but interference with low latency transmissions increases
Solution Approach 1:
The patent applies preliminary action by puncturing latency-tolerant transmissions in advance when low latency data is predicted or detected to arrive. The system proactively removes or mutes the latency-tolerant data from the shared resources before the low latency data transmission begins, preventing interference rather than resolving it after the fact. This ensures clean resource allocation for time-sensitive data while still allowing efficient use of resources during idle periods.
Solution Approach 2:
When low latency data needs to be transmitted, the system extracts or removes the latency-tolerant data from the shared resources temporarily. This extraction eliminates the harmful interference effect while maintaining the resource allocation structure. The latency-tolerant data is taken out of the transmission mix on those specific resources, allowing pure low latency transmission without contamination from other data types.
3Loss of time
If puncturing is used to accommodate low latency data, then latency requirements are met, but transmission reliability for latency tolerant data deteriorates
Solution Approach 1:
The system implements feedback mechanisms where the base station monitors both the arrival of low latency data and the state of punctured latency-tolerant transmissions. When puncturing occurs, the system tracks which resources were affected and uses this feedback information to manage retransmissions and ensure eventual delivery of the punctured data, maintaining reliability despite the temporary disruption caused by low latency requirements.
Data Source
AI summary
Resources used for downlink communication may be partitioned by the base station so that a portion of the resources is reserved for the downlink transmission of low latency data. However, low latency data may be bursty or sporadic in nature, and may be transmitted in short packets. Therefore, there may not always be low latency data at the base station that needs to be transmitted using all of the low latency resources. System and methods are therefore disclosed in which the base station opportunistically schedules, on the low latency resources, latency tolerant data for one or more latency tolerant UEs. When latency tolerant data is scheduled on the low latency resources, signaling is used to indicate if the latency tolerant transmission on the low latency resources is modified.