RAN TTI Bundling Prediction for Air Interface Load Control
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Solution Overview
Problem
The application of TTI bundling in LTE networks for VoLTE calls can lead to increased air interface load and resource consumption for non-latency sensitive data communications, causing user experience issues and resource inefficiencies, as it applies to all PUSCH transmissions without differentiation.
Innovation Solution
A method where the RAN predicts the impact of TTI bundling on non-VoLTE data communications during a VoLTE session and takes action to limit air interface communication if the predicted load exceeds a predefined threshold, such as throttling or handover to a less congested base station.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If TTI bundling is applied to all PUSCH transmissions during VoLTE calls, then latency is reduced for real-time communication, but air interface load and resource consumption increase significantly for non-latency sensitive data
Solution Approach 1:
The patent applies different transmission modes to different data types: TTI bundling is applied only to latency-sensitive VoLTE traffic while non-latency-sensitive data uses normal transmission. This local differentiation resolves the contradiction by providing low latency where needed without unnecessarily increasing air interface load for all traffic types.
Solution Approach 2:
The system dynamically adjusts transmission mode based on traffic characteristics and network conditions. The base station determines whether to apply TTI bundling on a per-transport block basis, allowing flexible adaptation that reduces latency for real-time traffic while managing overall air interface load through predictive analysis of bundling impact.
2Productivity
If TTI bundling is applied to reduce latency, then real-time communication quality improves, but PUSCH resource consumption increases by 2-4 fold
Solution Approach 1:
TTI bundling is selectively applied only to specific transport blocks carrying latency-sensitive traffic rather than all PUSCH transmissions. This localized application maintains communication efficiency for real-time applications while avoiding 2-4 fold resource consumption for non-critical data.
Solution Approach 2:
Instead of applying TTI bundling excessively to all traffic, the system uses partial action by applying it only when and where needed for latency-sensitive packets, thereby achieving communication efficiency improvements without excessive resource consumption.
3Reliability
If the base station applies TTI bundling in response to VoLTE call initiation, then call quality improves, but other non-latency sensitive data communications are adversely affected
Solution Approach 1:
The base station applies TTI bundling selectively to VoLTE transport blocks while allowing normal transmission for other data types. This local differentiation maintains high call quality while preserving good user experience for non-real-time applications by avoiding unnecessary resource consumption and delays.
Solution Approach 2:
The transmission mode is dynamically adjusted based on the type of data being transmitted. The base station identifies latency-sensitive VoLTE packets and applies bundling only to those, while using normal transmission for other data, thereby maintaining call quality without adversely affecting overall user experience.
Data Source
AI summary
A method and system to help manage wireless communication with a UE in a manner that takes into account a predicted impact of data bundling, such as TTI bundling, with respect to communication of data during a session. When a radio access network (RAN) is going to serve a UE with data communication for a VoLTE call or other session that would trigger such bundling, the RAN will predict the extent of other data that will be communicated during the session, and the RAN will predict the impact, such as increased air interface load, that would result from data bundling of at least that other data communication. If the RAN thereby predicts that the impact of data bundling with respect to at least that other data communication will exceed a predefined threshold level, then the RAN will responsively take action to limit its air interface communication with the UE.