TTI Bundling Configuration via Frequency-Selective Channel Quality
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Solution Overview
Problem
Current methods for determining whether to enable or disable TTI bundling in radio communication systems are inefficient, leading to reduced VoIP quality, inefficient resource usage, and increased interference due to their reliance on average wideband channel quality rather than frequency-selective conditions.
Innovation Solution
A method and network node that utilize frequency-selective channel quality information to decide whether TTI bundling should be enabled or disabled for User Equipment, preserving frequency-selective information to make more accurate decisions and optimize resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TTI bundling is enabled for all UEs, then uplink coverage is improved for power-limited UEs, but UL-SCH resource usage increases four times for UEs that do not need segmentation
Solution Approach 1:
The patent applies local quality by making TTI bundling configuration UE-specific rather than cell-wide. The network node determines whether each individual UE should use TTI bundling based on its specific channel quality information, power limitations, and traffic characteristics. This allows UEs that need coverage enhancement to use TTI bundling while UEs with good channel conditions use normal transmission, optimizing resource usage for each local case.
Solution Approach 2:
The patent implements dynamics by enabling the network node to dynamically switch TTI bundling configuration for each UE based on changing channel conditions and traffic patterns. The configuration can be activated or deactivated through RRC reconfiguration messages, allowing the system to adapt to varying conditions rather than using a static cell-wide setting.
2Quantity of substance
If TTI bundling is disabled for UEs that need it, then UL-SCH resource usage is efficient, but VoIP quality deteriorates due to packet errors and losses
Solution Approach 1:
The patent uses feedback mechanisms where the network node continuously monitors channel quality information (CQI), signal-to-interference-plus-noise ratio (SINR), and uplink transmission success rates for each UE. Based on this feedback, the network node determines whether to activate or deactivate TTI bundling for each UE, ensuring that coverage enhancement is applied only when actually needed to maintain VoIP quality.
Solution Approach 2:
The patent changes the configuration parameter (TTI bundling activation status) for each UE based on measured channel conditions. When channel quality degrades below a threshold or packet error rates increase, the parameter is changed to enable TTI bundling, thereby maintaining VoIP quality while avoiding unnecessary resource usage when conditions are good.
3Reliability
If TTI bundling is configured for UEs that do not need it, then uplink coverage is maintained, but processing resources in eNB and air interface resources are wasted due to RRC reconfiguration
Solution Approach 1:
The patent applies local quality by making TTI bundling configuration UE-specific rather than cell-wide. The network node determines whether each individual UE should use TTI bundling based on its specific channel quality information, power limitations, and traffic characteristics. This allows UEs that need coverage enhancement to use TTI bundling while UEs with good channel conditions use normal transmission, optimizing resource usage for each local case.
Solution Approach 2:
The patent implements discarding and recovering by allowing the network node to deactivate TTI bundling configuration for UEs that no longer need it, thereby recovering processing resources and air interface resources that were being consumed by unnecessary RRC reconfigurations and bundled transmissions. The configuration is discarded when no longer beneficial and can be recovered/activated again if conditions change.
4Reliability
If TTI bundling is used extensively, then power-limited UEs achieve better transmission reliability, but interference on the air interface increases
Solution Approach 1:
The patent applies local quality by making TTI bundling configuration UE-specific rather than cell-wide. The network node determines whether each individual UE should use TTI bundling based on its specific channel quality information, power limitations, and traffic characteristics. This allows UEs that need coverage enhancement to use TTI bundling while UEs with good channel conditions use normal transmission, optimizing resource usage for each local case.
Solution Approach 2:
The patent applies partial action by enabling TTI bundling only for the specific subset of UEs that need coverage enhancement rather than for all UEs in the cell. This partial application of the technique provides the necessary transmission reliability for power-limited UEs while avoiding the excessive resource consumption and interference that would result from universal application.
Data Source
AI summary
There is provided a method and corresponding network node for handling TTI bundling in a radio communication system. The method comprises the steps of obtaining (S1) frequency-selective channel quality information for at least one User Equipment (UE), and determining (S2) whether TTI bundling should be enabled or disabled for the UE(s) based on the frequency-selective channel quality information. By using frequency-selective channel quality information, more accurate decisions of whether TTI bundling should be enabled or disabled can be made, thus leading to more efficient resource utilization.