Wireless Waveform Indication for D2D Blind Decode Reduction
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Solution Overview
Problem
Wireless communication systems face challenges in supporting multiple waveforms, particularly in device-to-device (D2D) communications, such as vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I), where network coordination is not possible, leading to increased blind decodes and latency issues due to the lack of waveform configuration information.
Innovation Solution
The method involves determining and indicating separate waveforms for control and data transmissions using demodulation reference signals (DM-RS) or listen-before-talk (LBT) sequences, allowing devices to select waveforms based on resource pool configurations or capabilities, enabling coexistence of cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) and discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM) within the same resource pool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple waveforms are supported in D2D communications without network coordination, then waveform flexibility and adaptability are improved, but blind decodes increase and latency worsens
Solution Approach 1:
The patent applies preliminary action by having the transmitting device indicate the selected waveform (CP-OFDM or DFT-S-OFDM) before the data transmission begins. This waveform indication is provided in advance through control information or signaling mechanisms, allowing the receiving device to prepare the appropriate decoder in advance, thereby eliminating the need for blind decoding and reducing latency while maintaining waveform flexibility.
Solution Approach 2:
The patent implements feedback mechanisms where the receiving device receives waveform indication information from the transmitting device and adjusts its decoding parameters accordingly. This feedback loop ensures that both devices are synchronized on the waveform type used, enabling efficient communication without repeated blind attempts to decode the signal.
2Adaptability or versatility
If multiple waveforms are supported in D2D communications without network coordination, then waveform flexibility and adaptability are improved, but the number of blind decodes increases
Solution Approach 1:
The patent introduces an intermediary signaling mechanism (waveform indication field) that mediates between the transmitting and receiving devices. This intermediary element carries the waveform selection information, allowing the receiving device to directly access the correct decoding parameters without attempting multiple blind decodes, thus reducing device complexity while preserving waveform adaptability.
Solution Approach 2:
The waveform indication is provided in advance before the data transmission starts, allowing the receiving device to pre-configure its decoder with the correct waveform parameters. This preliminary action eliminates the need for blind decoding attempts and reduces the computational complexity of the receiving device.
3Reliability
If separate waveforms are used for control and data transmissions, then decoding reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a single waveform indication mechanism that serves multiple purposes: it indicates the waveform type for both control information and data transmissions, and it can be interpreted differently based on the transmission type. This multi-functional approach improves decoding reliability while avoiding the need for separate complex configuration systems.
Solution Approach 2:
The patent utilizes parameter changes by modifying the interpretation of the waveform indication based on the transmission type (control vs. data). The same indication mechanism adapts its function based on contextual parameters, allowing reliable decoding without requiring fundamentally different configuration systems for different transmission types.
Data Source
AI summary
Aspects described herein relate to determining multiple waveforms for transmitting wireless communications. A control waveform can be determined for transmitting a control information transmission related to a data transmission as one of multiple waveforms. A data waveform can be determined for transmitting the data transmission as one of the multiple waveforms. The control information transmission can be transmitted based on the control waveform, and the data transmission can be transmitted based on the data waveform.