Wireless Transmitter Mode Switching for Mobility Throughput Trade-off
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Solution Overview
Problem
Conventional wireless communication technologies fail to provide high throughput and quality service at high mobility speeds, with Wi-Fi guaranteeing high throughput but not suitable for mobile environments and cellular technologies offering low data rates, while WiBro and IEEE 802.11p technologies provide lower performance than both.
Innovation Solution
A wireless transmitter that dynamically adjusts its operation mode based on the wireless network environment, channel state, and user mobility, using an operation mode decision unit to select appropriate clock signals and digital modulation units to optimize data rate and link performance, including reconfiguration of cyclic prefix length and guard interval to enhance mobility and throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If Wi-Fi technology is used to guarantee high throughput of 600 Mbps, then data rate is improved, but mobility performance deteriorates and service quality degrades at high movement speeds
Solution Approach 1:
The patent implements dynamic operation mode switching between IEEE 802.11n (high throughput) and IEEE 802.11p (high mobility) modes based on real-time detection of user mobility state. The system transitions from static configuration to dynamic adaptation, selecting the appropriate mode according to whether the user is stationary or mobile, thereby resolving the contradiction between throughput and mobility performance
Solution Approach 2:
The patent changes the operational parameters (data rate, modulation scheme, coding rate) by switching between different IEEE 802.11 standards. When mobility is detected, the system changes from 802.11n parameters (optimized for throughput) to 802.11p parameters (optimized for mobility), enabling the system to adapt to varying operational conditions and maintain service quality
2Speed
If cellular technology is used to provide voice communication at high-speed movement of 200 km/h, then mobility is improved, but data rate deteriorates to only voice data level
Solution Approach 1:
The system dynamically selects between operational modes based on detected mobility state. When high mobility is detected (200 km/h), the system switches to IEEE 802.11p mode which is optimized for mobility, allowing voice communication. When low mobility is detected, the system switches to IEEE 802.11n mode to provide high data rates for multimedia services, thus resolving the contradiction between mobility speed and data rate
3Reliability
If WiBro and IEEE 802.11p technology are used to provide mobility service, then mobility performance is improved, but data rate deteriorates to lower performance than Wi-Fi
Solution Approach 1:
The patent creates a universal wireless communication system that supports multiple IEEE 802.11 standards (both 802.11n and 802.11p) within a single system. The system can function in high-throughput mode when stationary and high-mobility mode when moving, making it universally applicable to different service requirements and resolving the contradiction between mobility performance and data rate by providing both capabilities
Data Source
AI summary
A wireless transmitter which performs reconfiguration for high mobility and high throughput includes: an operation mode decision unit configured to decide an operation mode depending on mobility, a required data rate, and wireless link performance; a clock generation unit configured to generate a plurality of clock signals; a selection unit configured to select necessary clock signals among the plurality of clock signals generated by the clock generation unit according to the operation mode decided by the operation mode decision unit; and at least one or more digital modulation units configured to modulate transmitted data by adjusting a signal bandwidth of a frequency domain and a transmission time of a time domain using the clock signals selected by the selection unit.