Communication Control Parameter Determination for Wireless Coexistence
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Solution Overview
Problem
Co-existence issues, such as interference, arise in wireless communication systems when different radios, like IEEE 802.11ah and LTE, are co-located and use similar frequencies, leading to degraded performance due to desensitization of receivers.
Innovation Solution
The solution involves determining communication control parameters based on a communication schedule used in another technology, employing techniques like restricted access windows, target wake times, sectorized antennas, and rate selection for control information transmission to minimize interference between IEEE 802.11ah and LTE systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If co-located radios (IEEE 802.11ah and LTE) operate simultaneously on similar frequencies, then communication coverage and service availability are improved, but receiver desensitization and interference occur
Solution Approach 1:
The patent implements periodic transmission opportunities for 802.11ah control information aligned with LTE DRX cycles. Control information is transmitted only during specific periodic intervals when the LTE radio is in DRX OFF state, creating a rhythmic pattern of communication that avoids continuous interference while maintaining service availability.
Solution Approach 2:
The patent segments the transmission medium by creating restricted access windows within the DRX cycle. These segmented time intervals are specifically allocated for 802.11ah control information transmission, separating it from LTE transmission periods and reducing mutual interference between the two radio systems.
2Reliability
If 802.11ah control information is transmitted continuously, then communication reliability is improved, but interference with LTE reception increases
Solution Approach 1:
The patent uses the LTE DRX cycle as an intermediary timing mechanism to coordinate 802.11ah transmissions. By aligning 802.11ah control information transmission with the LTE DRX OFF periods, the DRX schedule acts as a mediator that harmonizes the operation of both radio systems and minimizes harmful interference.
Solution Approach 2:
The patent applies preliminary anti-action by proactively scheduling 802.11ah control information transmission only during predetermined LTE DRX OFF intervals. This advance planning prevents interference before it occurs, rather than attempting to mitigate it after the fact, ensuring both control information reliability and LTE reception quality.
3Productivity
If 802.11ah uses higher transmission rates, then data throughput is improved, but robustness against interference from LTE decreases
Solution Approach 1:
The patent applies different transmission qualities to different types of 802.11ah traffic. Control information is transmitted using more robust, lower-rate modulation schemes during restricted access windows to ensure reliable delivery in the presence of potential interference, while data traffic can utilize higher rates when channel conditions permit, optimizing overall system performance.
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AI summary
A communication control parameter for communicating via one technology is determined based on a communication schedule used in another technology. In some aspects, interference between a wireless local area network and a wireless wide area network is mitigated by appropriate selection of the communication control parameter. In some aspects, enhanced media access control features of IEEE 802.11ah are employed to facilitate co-existence between radio technologies. For example, interference may be mitigated through the use of a restricted access window, a target wake time, sectorized antennas, scheduled control information transmissions, and rate selection for control information.