Wireless Coexistence via Multiple PHYs and Channel Adaptation
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Solution Overview
Problem
In shared wireless medium environments, existing technologies face challenges in ensuring coexistence of multiple wireless devices operating on the same or overlapping radio bands, leading to interference and inefficient use of channels.
Innovation Solution
A wireless device is configured to detect and adapt to the presence of other wireless networks, selecting non-interfering channels or using co-channel operation, and implementing protocols like CSMA/CA and RTS/CTS to reserve time slots and access the shared medium without causing interference, allowing multiple PHYs to coexist and share the wireless medium efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple wireless devices operate on the same radio band in a shared wireless medium, then the wireless medium can be utilized more efficiently, but interference and collisions between transmissions increase
Solution Approach 1:
The patent implements periodic channel assessment and transmission opportunities (TXOPs) where devices periodically evaluate channel conditions and transmit during allocated time periods. The system uses periodic beacon frames and channel assessment intervals to manage multiple devices sharing the medium without continuous interference.
Solution Approach 2:
The patent employs preliminary channel assessment and reservation mechanisms where devices evaluate channel conditions before transmission and reserve transmission opportunities in advance. The clear channel assessment (CCA) and TXOP reservation allow devices to prepare and coordinate transmissions before actually using the medium, preventing collisions.
2Adaptability or versatility
If wireless devices use standard PHY protocols for transmission, then communication compatibility is maintained, but coexistence with other wireless networks operating on overlapping channels becomes difficult
Solution Approach 1:
The patent introduces a coexistence manager as an intermediary layer between the standard PHY protocols and the shared wireless medium. This manager coordinates transmissions across multiple networks, mediates channel access, and ensures that devices from different wireless standards can coexist while maintaining their protocol compatibility through the mediation layer.
Solution Approach 2:
The patent creates a universal coexistence mechanism that works across multiple wireless PHY standards (802.11a/b/g/n/ac). The coexistence manager and channel assessment protocols are designed to be protocol-agnostic, allowing devices implementing different PHY standards to share the medium universally without sacrificing their standard-specific communication reliability.
3Reliability
If wireless devices continuously monitor the channel for collisions, then transmission reliability improves, but energy consumption and system complexity increase
Solution Approach 1:
The patent implements periodic channel assessment instead of continuous monitoring. Devices perform clear channel assessment (CCA) at specific intervals and during designated transmission opportunities, rather than continuously monitoring the medium. This periodic approach maintains transmission reliability by detecting channel conditions at critical moments while significantly reducing energy consumption compared to continuous monitoring.
4Object-affected harmful factors
If devices reserve time slots for transmission using protocols like RTS/CTS, then collisions are reduced, but transmission overhead and latency increase
Solution Approach 1:
The patent implements selective reservation where devices use RTS/CTS or similar reservation protocols only when necessary - specifically when channel conditions indicate potential conflicts or when multiple devices are contending for the medium. In situations with clear channel conditions or single-device transmission opportunities, the patent skips the reservation overhead, thereby reducing latency and maintaining collision reduction only where needed.
Data Source
AI summary
Methods, apparatus and systems supporting coexistence of wireless devices and equipment in shared wireless medium environments through the use of multiple PHYs. The techniques provided herein may be applied to various types of wireless devices and equipment. Under one example, a wireless device transmits and/or receives signals using one or more frequencies and/or channels within shared wireless medium environments in which other wireless equipment is operating, such as access points and stations in wireless local area networks (WLANs). The wireless devices are configured to coexist with the operations of the other wireless equipment within the shared wireless medium environment by adapting its transmission operations to utilize frequencies or channels that do not interfere with other equipment and/or implementing co-channel and shared channels operations under which access to channels is implemented using standardized WLAN protocols such as, but not limited to PHY and MAC protocols used for 802.11 (Wi-Fi™) networks.