Non-Aligned Channel Coexistence Using Dual RTS/CTS Reservation
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Solution Overview
Problem
Existing wireless communication systems face challenges in coexistence management across non-aligned channels, particularly in the UNII-2C and UNII-3 bands, leading to frequent collisions and data reception failures due to the 5 MHz channel offset, without effective solutions in the related art.
Innovation Solution
A method involving dual control frames or frequency-shifted PPDU transmission is employed to manage coexistence across non-aligned channels, using dual RTS/CTS frames or frequency-aligned PPDU parts to reserve airtime and align communication across the target and non-aligned channels, ensuring seamless data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wireless devices operate across UNII-2C and UNII-3 bands with continuous bandwidth, then spectrum utilization is improved, but channel misalignment causes collisions and data reception failures
Solution Approach 1:
The patent segments the continuous bandwidth operation into two separate channel operations: the target channel operation and the non-aligned channel operation. By transmitting dual control frames (RTS/CTS) on both channels separately, the system manages each channel independently while maintaining continuous bandwidth utilization, thus preventing collisions caused by channel misalignment
Solution Approach 2:
The patent applies preliminary action by transmitting control frames (RTS or CTS) before actual data transmission on both the target channel and non-aligned channel. This advance reservation of airtime on both channels prevents collisions by notifying other devices of the upcoming transmission, ensuring reliable data reception across non-aligned channels
2Reliability
If dual control frames are transmitted on both target and non-aligned channels, then collision prevention is improved, but communication protocol complexity increases
Solution Approach 1:
The patent makes the control frame mechanism universal by using the same RTS/CTS control frame structure for both the target channel and non-aligned channel operations. This multi-functionality allows a single protocol design to handle both aligned and non-aligned channel scenarios, reducing the need for separate complex protocols while maintaining collision prevention
Solution Approach 2:
The patent uses copying by transmitting identical control frames (RTS or CTS) on both the target channel and non-aligned channel. The same control frame type and structure are copied to both channels, simplifying the protocol implementation while ensuring both channels are properly reserved, thus preventing collisions without requiring complex channel-specific protocols
Data Source
AI summary
A method for performing coexistence management with respect to a non-aligned channel in a wireless communication system and associated apparatus are provided, where a target device using a target channel is wirelessly linking to a wireless transceiver device, and a difference between a minimum of a first frequency range of the non-aligned channel and a minimum of a second frequency range of the target channel is not a multiple of twenty megahertz (20 MHz). The method may include: transmitting dual control frames of a same subtype to reserve airtime in the target channel as well as the non-aligned channel, for data transmission corresponding to the target channel; or transmitting a physical layer (PHY) protocol data unit (PPDU) on the target channel, with at least one part of the PPDU being frequency-shifted for alignment to the non-aligned channel in order to spoof another device that is using the non-aligned channel.