WTRU Waveform Switching for Coverage-Limited Throughput
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently adapting waveform selection for optimal performance, particularly in scenarios where dynamic waveform switching is supported by some cells but not others, leading to suboptimal throughput and coverage.
Innovation Solution
A wireless transmit/receive unit (WTRU) selects cells supporting dynamic waveform switching based on reference signal received power (RSRP) thresholds and transmits preambles indicating its capability, allowing it to switch from CP-OFDM to DFT-s-OFDM waveforms for improved throughput in coverage-limited scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the WTRU uses a fixed waveform type (CP-OFDM) for all communications, then the system complexity is reduced and compatibility is improved, but the throughput is suboptimal in coverage-limited scenarios
Solution Approach 1:
The system enables dynamic waveform switching where the WTRU can transition between CP-OFDM and DFT-s-OFDM waveforms based on coverage conditions. The WTRU receives indication of neighboring cell waveform support capabilities and selectively switches to DFT-s-OFDM when RSRP is below a threshold, allowing the waveform type to adapt dynamically rather than remaining fixed
Solution Approach 2:
The invention changes the waveform type parameter based on measured RSRP values. When the RSRP of a neighboring cell supporting dynamic waveform switching falls below a configured threshold, the WTRU switches from CP-OFDM to DFT-s-OFDM waveform type, thereby adjusting the transmission parameter to match coverage conditions
2Productivity
If the WTRU prioritizes cells supporting dynamic waveform switching, then the throughput in coverage-limited scenarios is improved, but the device complexity increases due to additional measurement and selection procedures
Solution Approach 1:
The network performs preliminary action by broadcasting or signaling waveform support capabilities of neighboring cells before the WTRU needs to make switching decisions. The WTRU receives indication of which neighboring cells support dynamic waveform switching in advance, allowing it to prioritize these cells when performing measurements without needing complex real-time analysis
Solution Approach 2:
The WTRU autonomously performs measurements of neighboring cells, compares RSRP values against thresholds, and independently decides whether to switch waveforms or prioritize specific cells based on the received capability indications. The device serves itself by making intelligent decisions without requiring continuous network control
Data Source
AI summary
Systems, methods, and instrumentalities are described herein for adaptive waveform selection for wireless communication. In examples, the wireless transmit/receive unit (WTRU) may be configured with the orthogonal frequency-division multiplexing (OFDM) initially. If the WTRU, which may support dynamic waveform switch, receives system information blocks (SIBs) from multiple cells where at least one of them supports dynamic waveform switch, the WTRU may prioritize the initial access with the cell(s) that support dynamic waveform switch. If the WTRU supports dynamic waveform switch, the WTRU may send a physical uplink shared channel (RUSCH) in msg3 at a configured grant, which may be offset by a preconfigured number of slots with a waveform that is different from the preconfigured waveform type.