Uplink Switching with Shortened TTI for mmWave Stability
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Solution Overview
Problem
The mmWave communication system faces challenges in maintaining stable uplink communication due to rapid channel changes and instability in the mmWave uplink band, leading to inefficient resource utilization and data degradation.
Innovation Solution
A method is proposed where the user equipment receives an indicator from the mmWave base station to switch to a legacy uplink, shortening the legacy Transmission Time Interval (TTI) to match the mmWave TTI, allowing communication to continue through the legacy uplink, thereby stabilizing communication and efficiently using resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mmWave uplink communication is used, then high data rate and advanced communication capability are achieved, but communication stability deteriorates due to rapid channel changes and instability
Solution Approach 1:
The system dynamically switches between mmWave uplink and legacy uplink based on channel conditions. The base station determines channel quality and sends switching indicators to the terminal, enabling adaptive selection of uplink path. This dynamic adjustment allows the system to maintain high data rates when mmWave conditions are good while ensuring stability when conditions deteriorate.
Solution Approach 2:
The legacy uplink serves as an intermediary communication path when mmWave uplink becomes unstable. By maintaining both mmWave and legacy uplink capabilities, the system can transition to the legacy path as a stable backup, ensuring continuous communication without complete service interruption when mmWave conditions are poor.
2Reliability
If legacy uplink is used with original TTI length, then communication stability is maintained, but resource utilization efficiency deteriorates due to mismatch with mmWave TTI
Solution Approach 1:
The system changes the TTI parameter of the legacy uplink from its original length to a shortened length that matches the mmWave TTI duration. This parameter adjustment allows synchronized operation of legacy and mmWave uplinks, improving resource utilization efficiency while maintaining the stability benefits of legacy communication when needed.
Solution Approach 2:
The TTI length of the legacy uplink is dynamically adjusted based on system needs. When legacy uplink is activated for stable communication, it uses the shortened TTI matching mmWave timing. This dynamic parameter adjustment ensures efficient resource usage while maintaining compatibility with mmWave communication timing.
3Reliability
If legacy uplink is activated to maintain stability, then communication reliability improves, but system complexity increases due to dual uplink management
Solution Approach 1:
The base station acts as an intermediary that centralizes the decision-making process for uplink selection. By having the base station determine channel conditions and send switching indicators to the terminal, the system simplifies terminal complexity while maintaining reliable dual-path management. The base station handles the complex coordination, reducing the burden on terminal devices.
Data Source
AI summary
Disclosed is an uplink communication method for: receiving data through an mmWave downlink from an mmWave base station; transmitting, to the mmWave base station, an ACK/NACK reply to the data and an mmWave uplink reference signal through an mmWave uplink; receiving, from the mmWave base station, an indicator indicating use of a legacy uplink instead of the mmWave uplink; shortening the length of a legacy TTI to correspond to the length of an mmWave TTI according to the indicator; and communicating with the mmWave base station through the legacy uplink using the shortened legacy TTI.