Dynamic Carrier Offloading for TTI Bundling UEs
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Solution Overview
Problem
In wireless communication systems, the re-transmission of data due to errors caused by poor RF conditions leads to increased latency and resource consumption, particularly when TTI bundling is used, which can result in reduced throughput and blocked communications if a high number of UEs are served on a carrier frequency.
Innovation Solution
A method where a base station offloads UEs with TTI bundling from a carrier frequency with high usage to a lower frequency carrier, limiting the number of UEs using TTI bundling and improving service quality by reducing resource consumption and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If TTI bundling is used to reduce re-transmission delay, then latency is reduced, but air interface resources are consumed in multiple TTIs leading to reduced throughput and blocking of other communications
Solution Approach 1:
The system dynamically adjusts TTI bundling configuration based on real-time channel conditions and UE performance metrics. The base station can activate or deactivate TTI bundling for specific UEs depending on whether they experience poor downlink channel conditions, thereby optimizing the balance between latency reduction and resource efficiency on a per-UE basis
Solution Approach 2:
TTI bundling is applied selectively to specific UEs based on their individual channel conditions rather than uniformly to all UEs. The base station identifies UEs experiencing poor downlink quality and applies TTI bundling only to those cases, ensuring that resources are consumed only where necessary to achieve the latency reduction benefit
2Loss of time
If TTI bundling is enabled for multiple UEs on a given carrier frequency, then more UEs benefit from reduced latency, but resource reservation in multiple TTIs causes reduced throughput and blocking of other communications
Solution Approach 1:
The base station continuously monitors the number of UEs utilizing TTI bundling on each carrier frequency and dynamically adjusts the configuration. When the number of TTI bundling UEs exceeds a threshold that would cause resource blocking, the base station selectively deactivates TTI bundling for certain UEs or migrates them to different carrier frequencies, thereby preventing resource blocking while maintaining the benefit for other UEs
Solution Approach 2:
The system introduces carrier frequency as an additional dimension for resource allocation. When TTI bundling causes resource blocking on one carrier frequency, the base station can migrate affected UEs to different carrier frequencies, effectively distributing the resource consumption across multiple frequency dimensions and reducing blocking on any single carrier
Data Source
AI summary
Methods and systems to help manage wireless communication with UEs in a manner that takes into account an extent of TTI bundling on a given carrier frequency. When a base station is serving a threshold high number of TTI-bundling-UEs on a first carrier frequency, the base station will reduce the number of TTI-bundling-UEs on the first carrier frequency by offloading one or more of the TTI-bundling-UEs from the first carrier frequency to a second carrier frequency. Further, to avoid increasing the number of TTI-bundling-UEs served on the first carrier frequency, when the base station detects a trigger event for enabling TTI bundling for an additional UE served on the first carrier frequency, the base station will offload the additional UE from the first carrier frequency to the second carrier frequency.