RIS-Assisted Uplink Random Access for Cell-Edge UEs
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Solution Overview
Problem
In wireless communications, UEs at the cell edge face challenges in transmitting uplink signals due to limited transmission power and beamforming gain, leading to initial random access (RA) failures, and existing methods fail to address these issues, especially for UEs in the Cell edge, causing interference in the Cell Edge, which affects the success rate of the wireless communications system, and existing methods fail to address these issues, especially for UEs in the Cell edge, which affects the wireless communications system, and existing methods fail to enhance the signal quality of the RIS.
Innovation Solution
Introducing a probing signal for the RIS to enhance the signals transmitted from the UE, the RIS is configured with an RIS ID, and the AoA is estimated via the probing signal, enabling the RIS to generate optimal reflection coefficients for enhancing the signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE increases transmission power to improve signal quality at cell edge, then uplink signal quality improves, but power consumption increases and interference increases
Solution Approach 1:
The patent introduces RIS (reconfigurable intelligent surface) as an intermediary device between the UE and the base station. The RIS reflects and redirects the uplink signal from the UE to the base station, providing signal enhancement without requiring the UE to increase its transmission power. This mediator approach resolves the contradiction by achieving reliable communication through external assistance rather than increasing the UE's power consumption.
2Reliability
If UE increases transmission power to improve signal quality at cell edge, then uplink signal quality improves, but interference in the cell edge increases
Solution Approach 1:
The RIS acts as a mediator that redirects signals through controlled reflection. By using the RIS to bounce signals to the base station, the system achieves reliable uplink communication without requiring UEs to transmit at high power levels that would cause interference. The intermediary approach allows signal enhancement while maintaining lower transmission power and reducing interference.
3Reliability
If RIS is deployed to enhance uplink signals, then signal quality improves, but system complexity increases
Solution Approach 1:
The patent implements self-service mechanisms where the RIS autonomously determines its reflection coefficients based on downlink channel measurements. The RIS independently calculates the optimal beamforming weights and configuration without requiring complex centralized control or manual configuration. This self-service capability reduces the operational complexity of deploying and managing RIS in the network while maintaining signal enhancement benefits.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances the success rate of initial RA procedures by improving signal quality and reducing power consumption and interference, especially for UEs at the cell edge.
Implementation Method 1
control the scattering, reflection, and refraction characteristics of the radio waves
Implementation Method 2
control the scattering, reflection, and refraction characteristics of the radio waves
Implementation Method 3
control the scattering, reflection, and refraction characteristics of the radio waves
Data Source
AI summary
Embodiments of the present application are related to methods and apparatuses of uplink signal enhancement. An embodiment of the present application provides a user equipment (UE) including: a wireless transceiver, and a processor coupled to the wireless transceiver, wherein the processor is configured to: transmit a signal, which is generated based on at least a re-configurable intelligent surface (RIS) identifier (ID), with the wireless transceiver; and transmit, with the wireless transceiver, a physical random access channel (PRACH) preamble after transmission of the signal.