Adaptive Control Channel Bandwidth for Wireless Interference
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Solution Overview
Problem
Wireless communication networks face interference issues when operating on the same or adjacent frequency bands, particularly in television whitespace (TVWS), where cellular or Wi-Fi communications can be affected by adjacent non-cellular channels such as digital television or radar channels, leading to reduced network performance and reliability.
Innovation Solution
Configuring a reduced bandwidth for the control channel in wireless networks to minimize interference from adjacent non-cellular channels, allowing the control information to be effectively transmitted and received without being disrupted by adjacent channel interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a cellular or Wi-Fi network operates on the same or adjacent frequency band with non-cellular channels, then the network can utilize available spectrum resources, but interference from adjacent non-cellular channels degrades communication reliability
Solution Approach 1:
The patent segments the frequency band by determining a reduced bandwidth for the control channel that is separated from the adjacent non-cellular channel. This segmentation isolates the control information transmission from interference-prone regions, allowing the network to simultaneously utilize available spectrum while protecting critical control signals from adjacent channel interference.
Solution Approach 2:
The patent applies local quality by configuring different bandwidths for different parts of the frequency spectrum. The control channel uses a reduced bandwidth positioned away from the adjacent non-cellular channel, while data channels can utilize the full available bandwidth. This localized optimization ensures reliable control signal transmission in interference-prone environments while maximizing overall spectrum utilization.
2Productivity
If the control channel uses full bandwidth, then transmission capacity is maximized, but interference from adjacent non-cellular channels increases
Solution Approach 1:
The frequency spectrum is segmented into a reduced bandwidth portion for the control channel and the remaining portion for data channels. This segmentation allows the control channel to operate in a protected region away from adjacent non-cellular channels, minimizing interference while data channels can utilize the full available bandwidth for maximum transmission capacity.
Solution Approach 2:
Different quality parameters are applied to different parts of the transmission: the control channel uses a reduced bandwidth with enhanced protection from interference, while data channels use the full bandwidth for maximum capacity. This local differentiation optimizes both reliability for control signals and productivity for data transmission.
3Reliability
If the control channel bandwidth is reduced, then interference from adjacent non-cellular channels is minimized, but control information transmission efficiency decreases
Solution Approach 1:
The patent extracts the control channel from the full bandwidth and places it in a dedicated reduced bandwidth region away from adjacent non-cellular channels. This extraction isolates control information transmission from interference-prone areas, ensuring high reliability. The remaining bandwidth is then available for data transmission, compensating for the reduced control channel capacity.
Solution Approach 2:
The patent changes the bandwidth parameter of the control channel from full bandwidth to a reduced bandwidth. This parameter change reduces exposure to adjacent channel interference, improving control information reliability. The network compensates for the reduced transmission efficiency by optimizing resource allocation across data channels that utilize the full available bandwidth.
Data Source
AI summary
A wireless network may implement a reduced bandwidth for control information transmitted and/or received on the wireless network. The reduced bandwidth may be used to avoid interference that may be detected from an in-band or adjacent channel. The reduced bandwidth may be used for transmission and/or reception of control information on a cellular or Wi-Fi channel. An eNB or an access point (AP) may signal to a wireless transmit/receive unit (WTRU) information associated with the reduced control channel, such as the power and/or the location of the channel in a frequency band. The control channel may be shifted to avoid a change in interference.