Wireless Communication Device Mobility Mode Selection
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Solution Overview
Problem
Existing wireless communication systems, particularly in high mobility environments like vehicle-to-vehicle (V2V) communication, face performance degradation due to Doppler spreads and inflexibility in doubly-dispersive channels, where orthogonal frequency-division multiplexing (OFDM) struggles, and novel modulation schemes like Orthogonal Time Frequency and Space (OTFS) require perfect grid matching and ideal channel knowledge, which are impractical.
Innovation Solution
The implementation of mobility modes with distinct grid and pulse matching for doubly-dispersive communication links, using a pre-defined set of communication modes to select a suitable time-frequency grid and pulse shape based on channel conditions, allowing for efficient communication even with imperfect channel knowledge and reducing self-interference through MMSE equalization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If OTFS modulation is used in high mobility environments, then reliability and robustness are improved, but implementation complexity increases due to requirements for perfect grid matching and ideal channel knowledge
Solution Approach 1:
The patent applies parameter changes by introducing a set of pre-configured mobility modes, each with specific time-frequency grid resolutions and pulse durations. The system selects appropriate parameters based on channel conditions (Doppler spread and delay spread), transforming the idealized OTFS requirements into practical, adaptable configurations that balance performance and complexity.
Solution Approach 2:
The patent implements dynamics by enabling the wireless communication device to dynamically select and switch between different mobility modes based on current channel conditions. This dynamic adaptation allows the system to optimize between grid resolution and pulse duration according to the actual Doppler and delay spreads, rather than requiring perfect grid matching in all scenarios.
2Manufacturing precision
If perfect grid matching is assumed for OTFS, then theoretical performance is improved, but practical applicability deteriorates due to idealized pulse violations and perfect channel knowledge requirements
Solution Approach 1:
The patent resolves this contradiction by changing the approach from seeking perfect grid matching to selecting from pre-defined grid configurations. Each mobility mode represents a practical compromise between time and frequency resolution, allowing the system to adapt to real-world channel conditions without requiring idealized perfect matching.
Solution Approach 2:
The patent applies partial action by implementing grid matching to the extent that is practically achievable through pre-configured mobility modes, rather than requiring complete perfect matching. This partial approach acknowledges real-world constraints while still achieving sufficient performance for high mobility environments.
3Measurement precision
If high granularity in delay-Doppler spread is supported, then measurement precision is improved, but device complexity increases due to computational requirements for equalization
Solution Approach 1:
The patent applies segmentation by dividing the continuous range of channel conditions into discrete mobility modes. Each mode corresponds to a specific range of Doppler and delay spreads, allowing the system to achieve adequate measurement precision without requiring exhaustive computational resources for all possible channel conditions.
Solution Approach 2:
The patent changes the approach from continuous high-granularity measurement to discrete mobility mode selection. By pre-configuring specific time-frequency grid resolutions and pulse durations for different mobility modes, the system achieves practical measurement precision while reducing computational complexity through parameter quantization.
Data Source
AI summary
Embodiments of the present disclosure relate to wireless communication devices, systems comprising wireless communication devices, and to an apparatus, a method and a computer program for a wireless communication device. The apparatus comprises a transceiver module for transmitting and receiving wireless transmissions. The apparatus comprises a processing module that is configured to control the transceiver module. The processing module is configured to communicate with a further wireless communication device via the transceiver module. The communication with the further wireless communication device is based on a transmission of data frames between the wireless communication device and the further wireless communication device. Each data frame is based on a two-dimensional grid in a time-frequency plane having a time dimension resolution and a frequency dimension resolution. The processing module is configured to select a communication mode from a plurality of communication modes for the communication between the wireless communication device and the wireless communication device. The communication mode defines a combination of a frequency dimension resolution and a time dimension resolution of the two-dimensional grid in the time-frequency plane.