CIoT Frame Structure for TDD LTE Adjacency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current wireless communication systems face challenges in supporting time division duplex (TDD) for cellular internet-of-things (CIoT) devices, particularly in reducing cost and battery consumption while maintaining efficient coverage and capacity, especially in challenging environments like indoor areas and basements.
Innovation Solution
The method involves configuring a frame in a CIoT carrier adjacent to a TDD LTE carrier, allowing for efficient TDD operations by optimizing the frame structure and power management, including the use of long TTIs and reduced channel complexity, to support massive low-throughput devices with improved power efficiency and latency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If TDD is supported in CIoT using conventional LTE frame structures, then coverage and capacity can be maintained, but device cost and battery consumption increase
Solution Approach 1:
The patent modifies the TDD frame structure parameters specifically for CIoT by introducing extended TTIs (10ms, 20ms, 40ms, 80ms) instead of conventional 1ms TTIs. This parameter change allows the system to maintain coverage and capacity requirements while reducing device complexity and power consumption by using longer, more efficient transmission intervals suited for low-throughput CIoT devices.
2Device complexity
If low data rate operation is used to reduce device cost and power consumption, then RF/baseband complexity decreases, but TDD support becomes challenging
Solution Approach 1:
The patent introduces dynamic TDD frame structures with variable TTI lengths (10ms, 20ms, 40ms, 80ms) that can be adapted to different CIoT service requirements. This dynamic approach allows the system to maintain TDD functionality while accommodating low data rate operations, enabling devices to use simpler RF/baseband configurations without sacrificing TDD support capability.
3Use of energy by moving object
If conventional LTE frame structures are used for CIoT TDD, then system compatibility is maintained, but power efficiency and latency performance deteriorate
Solution Approach 1:
The patent segments the conventional LTE frame structure into CIoT-optimized frames with extended TTI durations (10ms, 20ms, 40ms, 80ms). This segmentation allows the system to maintain compatibility with existing LTE infrastructure while creating specialized frame structures that improve power efficiency and reduce latency for CIoT applications by aligning transmission intervals with actual data generation patterns.
Data Source
AI summary
A method and apparatus for performing cellular internet-of-things (CIoT) transmission in a wireless communication system is provided. A base station (BS) configures a frame in a CIoT carrier which is adjacent to a time division duplex (TDD) long-term evolution (LTE) carrier, and performs the CIoT transmission using the frame in the CIoT carrier. A downlink (DL) of the CIoT carrier may be adjacent to the TDD LTE carrier. Or, a DL and an uplink (UL) of the CIoT carrier may be adjacent to the TDD LTE carrier.