Wireless Telecommunications Waveform Switching for Cell-Edge Reliability
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Solution Overview
Problem
Current methods for switching between DFT-S-OFDM and CP-OFDM waveforms in wireless telecommunications networks are inflexible and lack dynamic control, particularly for UEs at the cell edge, limiting coverage and efficiency.
Innovation Solution
Implementing dynamic waveform switching mechanisms using Downlink Control Information (DCI) for explicit or implicit indication, semi-persistent scheduling, and semi-static configurations to adapt the uplink waveform based on UE conditions and network signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static waveform configuration is used, then device complexity is reduced, but cell coverage and transmission reliability deteriorate for UEs at cell edge
Solution Approach 1:
The patent implements dynamic waveform switching where the UE can switch between DFT-S-OFDM and CP-OFDM waveforms based on network conditions and UE capabilities. The network configures multiple waveforms and indicates which waveform to use through DCI signaling, allowing the system to adapt to varying channel conditions and improve transmission reliability for cell edge UEs while maintaining manageable complexity through standardized procedures.
2Reliability
If dynamic waveform switching is implemented, then cell coverage and transmission reliability improve, but device complexity and control signaling overhead increase
Solution Approach 1:
The patent changes the waveform parameter dynamically based on network conditions. The network configures multiple waveforms (DFT-S-OFDM and CP-OFDM) and uses DCI signaling to indicate which waveform parameter should be used for upcoming transmissions. This allows the system to optimize transmission reliability by selecting appropriate waveforms while managing complexity through efficient parameter indication mechanisms.
Solution Approach 2:
The patent segments the waveform configuration into multiple independently configurable waveforms. The network can configure DFT-S-OFDM and CP-OFDM as separate waveform options, each with its own parameters and characteristics. This segmentation allows flexible selection of appropriate waveforms for different transmission scenarios without requiring complete reconfiguration of the entire system.
3Area of stationary object
If DFT-S-OFDM waveform is used for all transmissions, then implementation complexity is reduced, but coverage area and data rate capability deteriorate
Solution Approach 1:
The patent implements dynamic waveform selection where the system switches between DFT-S-OFDM and CP-OFDM based on UE location and channel conditions. Cell edge UEs can utilize DFT-S-OFDM for improved coverage, while cell center UEs can use CP-OFDM for higher data rates. The network manages this dynamically through configuration and DCI signaling, optimizing coverage area without permanently increasing device complexity for all UEs.
Data Source
AI summary
A wireless telecommunications apparatus for use in a wireless telecommunications network, the wireless telecommunications apparatus comprising: communication circuitry configured to transmit or receive wireless signals; and control circuitry configured to: control the communication circuitry to receive a first wireless signal, the first wireless signal being comprised in Downlink Control Information, DCI, and indicating a waveform to be used by the wireless telecommunications apparatus when transmitting a second wireless signal; and control the communication Receive first signal (DCI) circuitry to transmit the second wireless signal using the indicated waveform.