Adaptive TTI Bundling With Partial Transmission During Measurement Gaps
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Solution Overview
Problem
The LTE standard's TTI bundling method is resource-intensive, requiring four consecutive TTIs for uplink transmission, which is inefficient in loaded cells and does not adapt to varying SINR/path loss conditions.
Innovation Solution
Adaptive TTI bundling configurations that allow partial TTI bundle transmission during measurement gaps, enabling flexible resource allocation and dynamic TTI bundling enable/disable using Scell activation/deactivation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is configured to transmit four consecutive TTIs for uplink transmission, then uplink transmission reliability is improved, but resource consumption increases and scheduling flexibility deteriorates
Solution Approach 1:
The patent implements dynamic TTI bundling configuration where the eNodeB can adaptively enable or disable TTI bundling based on real-time channel conditions and network load. The configuration includes parameters like TTI bundle size and measurement gap timing that can be dynamically adjusted, allowing the system to transition between bundled and non-bundled transmission modes as needed to optimize resource utilization while maintaining reliability.
Solution Approach 2:
The patent changes key parameters of the TTI bundling mechanism, including the bundle size (number of consecutive TTIs), measurement gap timing, and activation status. By varying these parameters based on channel conditions and network state, the system can reduce resource consumption when full bundling is not necessary while maintaining sufficient transmission reliability through adaptive configuration.
2Reliability
If TTI bundling is enabled for cell edge UEs to improve HARQ retransmission cycle, then transmission performance is improved, but scheduling flexibility and resource allocation efficiency deteriorate
Solution Approach 1:
The patent introduces dynamic control mechanisms where the eNodeB can selectively activate or deactivate TTI bundling for specific UEs based on their channel conditions and traffic requirements. This dynamic adaptation allows the system to maintain scheduling flexibility by not forcing bundling on all UEs, while still providing enhanced HARQ performance to those who need it most.
Solution Approach 2:
The patent segments the TTI bundle into manageable portions by introducing measurement gaps that divide the bundled TTIs into transmission segments. This segmentation allows the eNodeB to schedule other UEs during the measurement gap periods, thereby maintaining scheduling flexibility while still providing the benefits of TTI bundling for cell edge UEs during their active transmission intervals.
3Reliability
If full TTI bundle transmission is scheduled, then uplink coverage is extended, but resource waste increases in loaded cells
Solution Approach 1:
The patent applies partial action by allowing UEs to transmit only the necessary number of TTIs within a bundle rather than requiring full four-TTI bundles. The measurement gap mechanism enables the eNodeB to interrupt or truncate the bundle after a certain point, preventing excessive resource consumption when the channel conditions or network load indicate that full bundling is not necessary, thus reducing resource waste while maintaining adequate uplink coverage.
Solution Approach 2:
The patent introduces periodic measurement gaps within the TTI bundle structure, creating a rhythm of transmission and measurement intervals. This periodic action allows the system to reassess channel conditions and network state during each gap, enabling dynamic adjustment of transmission duration and preventing resource waste in loaded cells while maintaining uplink coverage when needed.
Data Source
AI summary
Methods are disclosed for an adaptive Transmit Time Interval (TTI) Bundling Configuration using a measurement gap. In one embodiment the method includes scheduling allocation of a TTI bundle wherein pat of the TTI bundle overlaps a measurement gap; transmitting, by a User Equipment (UE), only a part of the scheduled TTI bundle; and scheduling other UEs to use the resources not used by the scheduled TTI bundle.