Dynamic Waveform Switching During Initial Access
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Solution Overview
Problem
Current wireless communication systems face challenges during initial access, as they lack the ability to dynamically switch waveforms based on the UE's location within the cell and power consumption constraints, leading to potential uplink coverage issues and inefficient resource utilization.
Innovation Solution
The system enables dynamic waveform switching during initial access by allowing the Base Station (BS) and User Equipment (UE) to switch between different waveforms, such as CP-OFDM and DFT-s-OFDM, based on the UE's requested waveforms, which are determined by measuring the quality of synchronization signal blocks (SSBs) and considering power status or power class.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a default waveform is used during initial access, then the system maintains simplicity in waveform selection, but the UE cannot optimize for uplink coverage or power consumption constraints
Solution Approach 1:
The BS transmits a first configuration indicating a mapping of SSBs to ROs before the UE performs initial access. This preliminary configuration includes waveform information that the UE can use to select an appropriate waveform during the random access procedure, enabling adaptive waveform selection without adding complexity to the access procedure itself.
Solution Approach 2:
The UE provides feedback to the BS by indicating a requested waveform during initial access based on the received configuration and its own measurements (SSB quality, power status). The BS then transmits a second configuration confirming or adjusting the waveform selection. This feedback loop enables adaptive waveform selection while maintaining system coordination.
2Reliability
If waveform switching is enabled during initial access, then uplink coverage and power efficiency are improved, but the initial access procedure becomes more complex
Solution Approach 1:
The BS provides a first configuration indicating a mapping of SSBs to ROs with associated waveform information before the UE performs random access. This preliminary action equips the UE with the knowledge needed to select an appropriate waveform (e.g., CP-OFDM for coverage, DFT-s-OFDM for power efficiency) without complicating the access procedure flow.
Solution Approach 2:
The system changes the waveform parameter dynamically during initial access based on UE conditions. The UE measures SSB quality and assesses its power status, then selects a waveform from the configured options. The BS confirms the selection through a second configuration, enabling parameter adaptation without procedural complexity.
3Productivity
If the UE selects waveform based on SSB quality and power status, then resource utilization is optimized, but the UE processing complexity increases
Solution Approach 1:
The UE autonomously determines the appropriate waveform by measuring SSB quality and assessing its own power status, then indicating the requested waveform to the BS. This self-service approach enables the UE to optimize resource utilization based on its conditions without requiring complex network coordination or additional processing at the BS.
Data Source
AI summary
Various aspects of the present disclosure relate to techniques for dynamic waveform switching during initial access. An apparatus is configured to transmit a first configuration via a default waveform to a user equipment (UE) during initial access, receive, from the UE, one or more indications of one or more requested waveforms during initial access where the one or more requested waveforms are different than the default waveform, and transmit a second configuration associated with the one or more requested waveforms during initial access.