Symbol Format Signaling for Guard Interval Waveform Alignment
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Solution Overview
Problem
Wireless communications systems experiencing inter-symbol interference and symbol or slot misalignment due to the use of different waveform types, such as cyclic prefix-based and guard interval-based waveforms, which reduce communication reliability.
Innovation Solution
A base station transmits control signaling to indicate a configuration for symbol formats, allowing UEs to switch between guard interval-based and cyclic prefix-based formats, reducing latency and improving communication reliability by aligning symbols and slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both cyclic prefix-based and guard interval-based waveform types are supported in a frequency band, then waveform flexibility and adaptability are improved, but inter-symbol interference and symbol or slot misalignment occur, reducing communication reliability
Solution Approach 1:
The patent applies dynamics by enabling dynamic switching between cyclic prefix-based and guard interval-based waveform types based on channel conditions. The system can adaptively select the appropriate waveform type for different transmission scenarios, allowing the base station to signal waveform type changes to UEs dynamically rather than being fixed, thus resolving the contradiction between waveform flexibility and communication reliability
Solution Approach 2:
The patent changes the parameter of waveform type configuration by introducing signaling mechanisms that allow dynamic modification of waveform parameters. The base station can indicate different waveform types (cyclic prefix-based or guard interval-based) for different subsets of symbols or slots, enabling parameter changes adapt to channel conditions while maintaining communication reliability through proper synchronization signaling
2Adaptability or versatility
If different waveform types are used to support various communication scenarios, then system adaptability is improved, but symbol format misalignment and inter-symbol interference increase
Solution Approach 1:
The patent introduces control signaling as an intermediary mechanism between the base station and UE to coordinate waveform type changes. This signaling acts as a mediator that ensures both sides are synchronized when switching between different waveform types, preventing inter-symbol interference by ensuring proper alignment before the actual data transmission begins
Solution Approach 2:
The patent applies preliminary action by establishing the appropriate waveform type and symbol format before actual data transmission occurs. The base station signals the intended waveform type in advance, allowing the UE to prepare its receiver accordingly. This preliminary configuration ensures that when data transmission starts, both sides are aligned and ready, preventing inter-symbol interference
3Loss of time
If dynamic waveform switching is implemented, then latency is reduced and UE complexity is lowered, but control signaling overhead increases
Solution Approach 1:
The patent applies local quality by providing waveform type indication only for specific subsets of symbols or slots where changes are needed, rather than requiring continuous signaling for the entire transmission. This allows the system to reduce control signaling overhead by applying waveform configurations locally only where necessary, while still enabling dynamic switching to reduce latency when needed
Data Source
AI summary
Methods, systems, and devices for wireless communications are described for indication of one or more symbol structures for one or multiple subsets of a set of symbols. The one or more symbol structures may include one or more guard interval (GI)-based symbol formats that are to be applied to one or more of the subsets of symbols. Different symbol formats may be indicated for different subsets of symbols, and a first subset of symbols may use a GI-based symbol format and a second subset of symbols may use a CP-based or GI-based symbol format. A base station may transmit control signaling to a user equipment to indicate one or more symbol structures for the one or more subsets of symbols, and the UE and the base station may communicate data in one or more slots in accordance with the indicated symbol structures based on the control signaling.