LTE TTI Bundling Frequency Hopping for Coverage
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Solution Overview
Problem
The existing Transmission Time Interval Bundling technique in LTE systems suffers from a lower frequency diversity gain, resulting in a smaller data transmission coverage area, with existing solutions failing to effectively address this issue.
Innovation Solution
A data transmission method and device that determine the frequency domain position of physical resource blocks using a frequency hopping manner based on the TTI Bundling parameter, allowing for flexible resource allocation and improved frequency diversity gain by adjusting the position of resource blocks across slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing Transmission Time Interval Bundling technique is used, then the coverage performance is improved, but the frequency diversity gain is reduced resulting in smaller data transmission coverage area
Solution Approach 1:
The patent applies frequency hopping to dynamically change the frequency domain position of physical resource blocks across different slots within the TTI Bundling transmission. Instead of using fixed frequency positions, the resource blocks hop to different frequency locations according to a predetermined pattern, making the transmission adaptive to varying channel conditions and thereby improving frequency diversity gain while maintaining coverage performance
Solution Approach 2:
The patent changes the frequency domain parameter (resource block position) across different time slots within the TTI Bundling. By varying the frequency position parameter according to frequency hopping patterns, the system exploits frequency diversity to improve data transmission coverage area while maintaining the coverage benefits of TTI Bundling
2Adaptability or versatility
If frequency hopping is implemented in TTI Bundling transmission, then the frequency diversity gain is improved, but the control cost increases
Solution Approach 1:
The patent employs self-service frequency hopping where the frequency domain position of resource blocks is determined by predetermined formulas using only uplink grant parameters and slot indices already available at the UE. The frequency hopping pattern is automatically generated without requiring additional downlink control information or feedback messages, thereby improving frequency diversity gain without increasing control cost
Solution Approach 2:
The patent extracts the frequency hopping functionality from the control signaling plane and implements it directly in the data transmission plane using existing parameters. By taking out the frequency position determination from explicit control messages and embedding it in the transmission resource allocation formulas, the system achieves frequency diversity without additional control overhead
Data Source
AI summary
Provided are a data transmission method and device. The method includes: determining, by means of a frequency hopping manner according to a TTI Bundling parameter, a frequency domain position of a physical resource block in a slot for sending a TTI Bundling, wherein a frequency hopping variable i of the frequency hopping manner is determined according to the TTI Bundling parameter by means of one of or a combination of predetermined approaches, where mod is a modulus operation, floor is rounded down operation, ns is a sequence number of the time slot; transmitting data on a time frequency resource corresponding to the frequency domain position of the physical resource block in the slot of the TTI bundling. According to the solution, the coverage area of the TTI bundling data transmission is improved.