Co-located Radio Interference Mitigation via Time-Domain Multiplexing
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Solution Overview
Problem
Communication devices with multiple co-located radio modules, such as WiMAX, WLAN, and Bluetooth, face significant interference due to close proximity of antennae, leading to degradation in simultaneous operation, especially in small form-factor platforms with closely spaced antennae.
Innovation Solution
Employing time-domain multiplexing techniques and power savings modes to ensure collaborative coexistence, where one radio module enters power savings mode when another is active, and reacts to over-the-air signaling to prevent collisions, using MAC-layer techniques for orthogonal transmit and receive operations on a frame-by-frame basis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If multiple radio modules are co-located in a small form-factor device, then device integration and portability are improved, but interference between radio modules occurs due to close antenna proximity
Solution Approach 1:
The patent segments the operation of multiple radio modules by dividing time into distinct intervals, where each radio module operates in its assigned time slot. This temporal segmentation allows multiple radios to share the same physical space without interference, as they transmit and receive signals at different times rather than simultaneously.
Solution Approach 2:
The patent implements periodic action by establishing a frame structure with repeating time intervals, where radio modules alternately activate and deactivate in a periodic manner. Each radio module follows a periodic schedule of transmission and reception phases, ensuring that interference is avoided while maintaining continuous overall communication functionality across all modules.
2Reliability
If time-domain multiplexing is used to prevent radio module interference, then communication reliability is improved, but system complexity increases due to coordination requirements
Solution Approach 1:
The patent merges the coordination functions into a unified MAC-layer protocol that manages all radio modules through a single standardized interface. By combining the scheduling, arbitration, and control mechanisms into one integrated protocol layer, the system reduces the complexity that would otherwise arise from implementing separate coordination mechanisms for each radio module pair.
Solution Approach 2:
The patent creates a universal MAC-layer protocol that serves multiple functions simultaneously: it performs scheduling, conflict resolution, power management, and coordination for all radio modules. This multi-functional approach eliminates the need for separate specialized mechanisms for each function, thereby reducing overall system complexity while maintaining high reliability.
3Productivity
If radio modules operate simultaneously, then communication efficiency is improved, but interference and collisions occur between transmissions
Solution Approach 1:
The patent implements dynamics by making the radio module operational state flexible and adaptive rather than fixed. Each radio module can dynamically transition between active and inactive states based on real-time scheduling decisions, allowing the system to optimize communication efficiency by activating modules only when their transmission is scheduled, thereby avoiding collisions while maximizing overall productivity.
Data Source
AI summary
Collaborative coexistence of co-located mobile WiMAX, wireless LAN, and/or Bluetooth radios. Within a communication device that includes multi-protocol communication capability, the various radio modules included within such a communication device operate cooperatively such that collisions are avoided between those various radios. When a first of the radio modules operates as governed by a relatively rigid frame structure, a second of the radio modules capitalizes upon that predetermined nature (of the relatively rigid frame structure) to support communication during times in which that first radio module has a lower level of activity (e.g., turned off completely, within a power savings mode, in a sleep mode, etc.). The radio module operation is performed within a time-orthogonal manner, such that multiple radio modules are not attempting to transmit or receive simultaneously. Moreover, CTS2SELF operation can be employed alone or in conjunction with power savings operation of co-located radios within a communication device.