Dynamic Resource Allocation for Wi-Fi and Bluetooth Coexistence
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Solution Overview
Problem
Wireless communication systems face interference and conflicts due to the coexistence of multiple radio access technologies (RATs) sharing resources such as antennas and frequency ranges, leading to inefficiencies and poor user experiences.
Innovation Solution
A wireless communication device is equipped with multiple radios and an application processor that determines the critical state of one radio based on traffic conditions, adjusting resource usage to reduce interference by modifying scan windows and intervals for other radios, thereby ensuring efficient coexistence of multiple RATs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple radio access technologies share common resources such as antenna and frequency range, then device functionality and communication versatility are improved, but interference and conflicts between different RATs occur leading to reduced communication reliability
Solution Approach 1:
The patent implements dynamic resource allocation where the application processor continuously monitors traffic conditions and dynamically adjusts the scan window duration and scan interval of the second radio based on the critical state of the first radio. This dynamic adaptation allows the system to switch between different operational modes (critical vs. non-critical) to optimize both versatility and reliability under varying conditions.
Solution Approach 2:
The patent changes operational parameters (scan window duration, scan interval) of the second radio based on the traffic state of the first radio. When the first radio is in a critical state, the scan window is reduced and scan interval is increased, thereby reducing interference while maintaining the ability to support multiple RATs.
2Reliability
If the first radio prioritizes latency-sensitive communication, then communication quality for critical applications is improved, but resource availability for the second radio is reduced
Solution Approach 1:
The patent implements periodic scanning for the second radio with dynamically adjusted intervals. During non-critical periods when the first radio has sufficient resources, the second radio performs scans at regular intervals. During critical periods, the scanning frequency is reduced, creating a periodic pattern that adapts to the traffic conditions of the first radio.
Solution Approach 2:
The patent applies partial action by reducing the scan window duration and increasing scan intervals for the second radio only when the first radio is in a critical state, rather than continuously limiting the second radio's resources. This partial limitation ensures that resource allocation is optimized based on actual traffic conditions.
3Speed
If the second radio performs frequent scanning for advertising packets, then connection establishment speed is improved, but interference with the first radio's communication increases
Solution Approach 1:
The patent dynamically adjusts the scan window duration and scan interval parameters of the second radio based on the critical state of the first radio. When interference is detected or the first radio is in critical state, the scan window is reduced and intervals are increased, thereby reducing harmful interference while maintaining connection capability.
Data Source
AI summary
Methods and apparatuses are presented to facilitate coexistence between multiple wireless communication protocols implemented by a wireless communication device, by dynamically adjusting priority between the two protocols. The wireless communication device may typically favor a first protocol (e.g. Bluetooth/BTLE), prioritizing resource requests by the first protocol. In certain use cases, the first protocol may demand high resource usage for an extended time, particularly for newer tracking and wearable devices, such as location tags, watches, headsets, etc. Such applications can disrupt existing use cases for a second protocol (e.g., Wi-Fi). Therefore, the wireless communication device may dynamically determine whether the second protocol is performing critical operations, such as latency-sensitive applications or high-performance operations. If so, the wireless communication device may allocate resources accordingly in real time, e.g., by reducing or limiting the resources assigned to the first protocol, to allow increased resources for the second protocol.