Two-Stage Chirp Signal Transmission for Uplink Power Control
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in uplink signal transmission, particularly in resolving RACH sequence collisions and accurately setting transmit power using open-loop power control, which affects the reliability and efficiency of two-stage chirp signal transmission.
Innovation Solution
A two-stage transmission method where the first stage involves transmitting a first portion of the uplink signal to determine initial power settings, followed by a second stage where both the first and second portions are transmitted using power levels adjusted based on successful completion of the first stage, effectively resolving collisions and optimizing power settings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a UE transmits a full uplink signal (RACH sequence and chirp message together) in a single stage, then the transmission process is simple and quick, but RACH sequence collisions cannot be resolved and transmit power cannot be accurately set
Solution Approach 1:
The uplink signal transmission is divided into two distinct stages: Stage 1 transmits only the RACH sequence for power determination and collision resolution, while Stage 2 transmits the complete signal including both RACH sequence and chirp message. This segmentation allows the system to first establish proper power levels and resolve collisions before transmitting the full message, thereby improving reliability without significantly impacting overall transmission efficiency.
Solution Approach 2:
The system performs preliminary actions in Stage 1 by transmitting the RACH sequence alone to determine open-loop power control settings and resolve collisions before the actual data transmission. This preliminary power determination and collision resolution enable the subsequent Stage 2 transmission to proceed with accurate power settings, reducing the need for retransmissions and improving overall transmission reliability.
2Ease of operation
If open-loop power control is used to set transmit power, then the power setting process is simple and fast, but the transmit power cannot be accurately determined leading to transmission failures
Solution Approach 1:
The system implements feedback mechanisms where the network responds to RACH sequence transmissions with power control commands. In Stage 1, the UE transmits the RACH sequence and receives power control feedback from the network, allowing iterative refinement of the transmit power setting. This feedback loop maintains the simplicity of open-loop control while significantly improving power determination accuracy, enabling successful transmissions in Stage 2.
3Adaptability or versatility
If RACH sequence collisions occur, then multiple UEs can transmit simultaneously, but the transmissions interfere with each other reducing success rates
Solution Approach 1:
The transmission process is segmented into Stage 1 for collision resolution and Stage 2 for data transmission. In Stage 1, multiple UEs can transmit RACH sequences simultaneously, and the network identifies colliding sequences by comparing received sequences against the set of available RACH sequences. This segmentation isolates collision resolution from data transmission, allowing concurrent transmissions while maintaining high reliability through systematic collision detection and resolution before proceeding to Stage 2.
Data Source
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AI summary
Aspects of the present disclosure provide a two-stage uplink transmission scheme. As described herein, a UE may transmit a first portion of an uplink signal to an AN, receive a first acknowledgment responsive to the first portion, and after receiving the first acknowledgement, transmit the first portion and a second portion of the uplink signal to the AN. The AN may receive a first portion of an uplink signal from UE, transmit a first acknowledgment responsive to the first portion, and after transmitting the acknowledgement, receive the first portion and a second portion of the uplink signal from the UE.