UE Waveform Change Requests for High-Frequency Access Adaptation
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently switching between different waveforms and subcarrier spacings to optimize performance in varying network conditions, particularly at high frequencies above 52.6 GHz, due to issues like signal degradation, path loss, and limitations in MIMO capabilities.
Innovation Solution
A method and apparatus for user equipment and base stations to request and respond to waveform changes, including transmitting and receiving messages to enable switching between multiple waveforms and subcarrier spacings based on network conditions and user equipment preferences, using techniques such as PRACH preambles and MsgA PUSCH transmissions to indicate preferred waveforms and spacings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed waveform is used during initial access, then system complexity is reduced, but adaptability to different frequency conditions deteriorates
Solution Approach 1:
The patent implements dynamic waveform selection by allowing the UE to request waveform changes based on measured channel conditions. The base station receives waveform change requests from the UE and responds with approved waveforms, transforming the static waveform assignment into a dynamic adaptation mechanism that responds to real-time channel conditions.
Solution Approach 2:
The patent changes the waveform parameter based on frequency conditions and channel measurements. The system allows switching between different waveforms (e.g., CP-OFDM, DFT-s-OFDM) and subcarrier spacings by processing UE requests, enabling parameter adaptation to optimize performance across different frequency ranges and channel qualities.
2Device complexity
If waveform selection is restricted to predefined options, then device complexity is reduced, but communication performance at high frequencies deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the UE measures channel conditions and sends waveform change requests to the base station. The base station processes these requests and responds with approved waveforms, creating a closed-loop system that uses feedback to optimize communication performance while maintaining manageable device complexity.
3Ease of operation
If the base station automatically selects waveform without UE input, then ease of operation is improved, but adaptability to UE-specific conditions deteriorates
Solution Approach 1:
The patent enables the UE to self-assess its channel conditions and autonomously generate waveform change requests based on its measurements. The UE services its own waveform selection needs by measuring channel quality, determining appropriate waveform changes, and submitting requests to the base station, thereby improving both ease of operation and UE-specific adaptability.
Data Source
AI summary
Apparatuses, methods, and systems are disclosed for requesting a waveform change. One method includes receiving, at a user equipment, first information indicating configurations for a plurality of waveforms and an indication indicating that the user equipment is enabled to request a waveform change, a subcarrier spacing change, or a combination thereof. The method includes transmitting a request message to a base station. The request message requests the waveform change, the subcarrier spacing change, or the combination thereof. The method includes receiving a response message from the base station. The response message indicates whether the request for the waveform change, the subcarrier spacing change, or the combination thereof is approved.