Dynamic TTI Bundle Size Adjustment for LTE HARQ Efficiency
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Solution Overview
Problem
Current LTE wireless communication systems with HARQ and TTI bundling mechanisms face inefficiencies due to fixed TTI bundle sizes, leading to unnecessary resource waste in retransmissions, as they do not adapt to changing channel conditions or latency requirements.
Innovation Solution
A dynamic bundle size adjustment mechanism is introduced, where the number of redundancy versions in TTI bundles is adjusted based on retransmission needs, determined by channel quality and latency, allowing for adaptive transmission to optimize resource use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed TTI bundle size is used, then backward compatibility and simple implementation are maintained, but resource waste occurs and transmission efficiency decreases
Solution Approach 1:
The patent implements dynamic TTI bundle size adjustment by introducing a configuration parameter that allows the bundle size to vary based on channel conditions and transmission requirements. The system dynamically selects from multiple predefined bundle size configurations (e.g., 4, 8, 16, 32 TTIs) rather than using a fixed size, enabling adaptation to changing wireless environments while maintaining manageable system complexity through standardized configuration options.
Solution Approach 2:
The patent changes the parameter of TTI bundle size from a fixed value to a configurable variable. By introducing configuration parameters that define different bundle size values and allowing dynamic selection among them, the system optimizes transmission efficiency for different channel conditions without requiring complete redesign of the HARQ mechanism, thus balancing performance improvement with implementation complexity.
2Reliability
If TTI bundle size is increased to improve coverage, then coverage enhancement is achieved, but latency increases and resource overhead increases
Solution Approach 1:
The patent enables dynamic adjustment of TTI bundle size based on real-time channel conditions and transmission requirements. When coverage enhancement is needed, larger bundle sizes can be selected; when latency is critical, smaller bundle sizes are used. This dynamic adaptation allows the system to optimize the trade-off between coverage and latency on a per-transmission basis rather than being constrained by a fixed bundle size.
Solution Approach 2:
The patent introduces configurable parameters that define multiple TTI bundle size values (e.g., 4, 8, 16, 32 TTIs). By allowing the system to select appropriate bundle size values based on channel quality indicators and transmission priorities, the patent enables flexible control over the coverage-latency trade-off, achieving coverage enhancement when needed while minimizing latency for time-sensitive transmissions.
3Ease of manufacture
If a fixed TTI bundle size is used, then implementation is simple, but resource waste occurs during retransmissions
Solution Approach 1:
The patent implements dynamic bundle size adjustment that adapts to channel conditions and transmission outcomes. When retransmissions are required, the system can modify the bundle size based on the decoding status and channel quality, transmitting only the necessary number of redundancy versions rather than always using the maximum fixed size. This reduces resource waste while maintaining implementation simplicity through standardized configuration mechanisms.
Solution Approach 2:
The patent changes the bundle size parameter from fixed to configurable and dynamically adjustable. By introducing configuration parameters that allow selection of different bundle size values and enabling dynamic modification based on transmission feedback, the system optimizes resource utilization during retransmissions without significantly complicating the implementation, as the changes build upon existing HARQ infrastructure.
4Productivity
If TTI bundle size is dynamically adjusted, then transmission efficiency improves and resource waste reduces, but system complexity increases
Solution Approach 1:
The patent implements dynamic TTI bundle size adjustment through a configuration framework that allows the system to adapt bundle sizes based on channel conditions and transmission requirements. The dynamic adjustment is achieved by selecting from a predefined set of configuration options rather than requiring continuous optimization, which balances transmission efficiency improvement with acceptable system complexity. The mechanism integrates with existing HARQ processes without requiring fundamental architectural changes.
Solution Approach 2:
The patent introduces configurable parameters that enable dynamic adjustment of bundle size while maintaining a manageable level of system complexity. By defining a finite set of configuration values and establishing clear rules for parameter selection based on channel quality indicators and transmission priorities, the patent achieves transmission efficiency improvement without requiring overly complex control mechanisms or algorithms.
Data Source
AI summary
A method, device and computer program product for transmitting data blocks in an LTE or similar wireless communication system supporting HARQ and TTI bundling, with dynamic TTI bundle sizing is provided. Each TTI bundle includes a number of redundancy versions of a data block, for example differently encoded versions of the data block which can be combined together in accordance with Type-II HARQ. Plural TTI bundles can be transmitted as necessary in accordance with HARQ, for example in response to a NACK. The present technology involves adjusting the TTI bundle size for a given HARQ process, wherein at least two TTI bundles have different sizes. In various embodiments, the TTI bundle size progressively decreases with retransmissions so that the last TTI bundle is not excessively large, thereby reducing resource waste. TTI bundle size adjustment may be implemented in the uplink, downlink, or both.