LTE HARQ Timing Adjustment for Ultra-Long Range Coverage
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Solution Overview
Problem
In LTE communication systems, achieving effective ultra-long-range coverage is challenging due to the reduction in processing time at the terminal side, leading to system malfunctions, as the processing capability is exceeded, especially at distances greater than 100 km, requiring increased costs to enhance processing capacity.
Innovation Solution
Increasing the uplink and downlink feedback sub-frame intervals for both the terminal and base station sides to accommodate longer communication ranges, allowing for extended HARQ processing time and reducing the processing capability requirements, thereby maintaining system functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the communication range is extended to ultra-long-range (greater than 100 km), then the coverage area is improved, but the terminal side processing time is reduced, leading to system malfunction
Solution Approach 1:
The patent dynamically adjusts the HARQ feedback timing based on the propagation delay. For ultra-long-range coverage, the feedback sub-frame interval is increased from the standard 4 sub-frames to accommodate the longer round-trip time, allowing the system to adapt timing parameters to the specific communication distance and maintain adequate processing time at the terminal side.
Solution Approach 2:
The patent changes the HARQ feedback timing parameter (sub-frame interval) from the standard value to an extended value suitable for ultra-long-range communication. This parameter adjustment compensates for the increased propagation delay and ensures the terminal has sufficient time to process signals over distances greater than 100 km.
2Length of stationary object
If the communication range is extended to ultra-long-range, then the coverage radius is improved, but the terminal processing capability is exceeded, requiring increased input cost
Solution Approach 1:
The system dynamically adjusts the HARQ feedback timing based on communication distance. For ultra-long-range scenarios, the feedback interval is extended to provide additional processing time at the terminal, avoiding the need to enhance terminal processing capability through additional hardware or complex algorithms.
Solution Approach 2:
The patent modifies the HARQ timing parameter (feedback sub-frame interval) to accommodate ultra-long-range communication requirements. This parameter change allows standard terminal equipment to operate effectively over extended distances without requiring enhanced processing capability or increased input cost.
3Loss of time
If the HARQ feedback sub-frame interval is increased for ultra-long-range coverage, then the terminal processing time is extended, but the communication efficiency is reduced
Solution Approach 1:
The patent applies different HARQ feedback timing configurations to different communication scenarios. Standard timing (4 sub-frames) is used for normal-range communication to maintain high efficiency, while extended timing is applied specifically to ultra-long-range scenarios where additional processing time is required, optimizing performance for each specific condition.
Solution Approach 2:
The system dynamically selects appropriate HARQ feedback timing based on the communication distance and propagation delay characteristics. This dynamic adjustment ensures that the feedback interval is optimized for each specific scenario, maintaining communication efficiency for standard ranges while providing adequate processing time for ultra-long-range coverage.
Data Source
AI summary
An LTE-based method, system, and device for ultra-distance coverage communication. The method comprises: increasing an uplink feedback subframe interval at a terminal side and an uplink feedback subframe interval at a base station side; after receiving uplink scheduling information sent by the base station side, the terminal side sending data over a subframe whose subframe interface is the increased uplink feedback subframe interval at the terminal side; and the terminal side receiving data verification information that is delivered by the base station side over a subframe whose subframe interval is the increased uplink feedback subframe interval at the base station side.