Antenna Arbiter for WLAN and Bluetooth Time Slot Sharing
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Solution Overview
Problem
In wireless communication systems, shared antennas often experience interference between WLAN and Bluetooth signals operating in the same or close frequency bands, leading to interruptions in Bluetooth services, particularly during data streaming.
Innovation Solution
An arbiter is used to control access to a single antenna, allowing WLAN communication circuitry to transmit and receive data packets during time intervals when no audio packets are being transmitted or received by the short range wireless communication circuitry, maximizing throughput for both data and audio packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If WLAN communication circuitry is given priority access to the shared antenna, then WLAN data transmission throughput is improved, but Bluetooth audio transmission reliability deteriorates due to interruptions
Solution Approach 1:
The patent segments the antenna access time into distinct time slots, with specific time intervals allocated for Bluetooth audio transmissions and other time periods allocated for WLAN data transmissions. This temporal segmentation allows both communication systems to operate reliably without mutual interference, resolving the contradiction between WLAN throughput and Bluetooth continuity by ensuring dedicated access periods for each system.
Solution Approach 2:
The patent implements dynamic antenna sharing where the arbiter adjusts time slot allocations and switching timing based on the operational states of both WLAN and Bluetooth systems. The system dynamically switches between WLAN and Bluetooth modes, optimizing resource utilization while maintaining reliable audio transmission by adapting to real-time communication demands.
2Reliability
If Bluetooth audio packets are transmitted continuously, then Bluetooth audio service reliability is improved, but WLAN data transmission productivity deteriorates due to frequent interruptions
Solution Approach 1:
The patent employs periodic action by scheduling Bluetooth audio transmissions in regular time slots separated by predefined intervals. During these designated time slots, Bluetooth transmits audio packets continuously to maintain service reliability, while WLAN transmissions occur during the intervals between Bluetooth slots. This periodic structure ensures both systems achieve their performance targets without mutual degradation.
3Device complexity
If a single antenna is shared between WLAN and Bluetooth circuitry, then device complexity is reduced, but signal interference increases between the two communication systems
Solution Approach 1:
The patent introduces an arbiter as an intermediary component that manages antenna access between WLAN and Bluetooth circuitry. The arbiter controls the switching and sharing of the common antenna, coordinating transmissions from both systems to prevent signal interference. This intermediary mechanism enables single-antenna operation while eliminating the harmful interference that would otherwise occur between the two communication systems.
Data Source
AI summary
A system including i) first wireless communication circuitry to receive and transmit packets of a first type via an antenna, and ii) second wireless communication circuitry to receive and transmit packets of a second type via the antenna. The packets of the second type are transmitted and received during time slots having a predefined length, and the time slots are separated by time intervals during which no packets of the second type are transmitted or received by the second wireless communication circuitry. The system further includes an arbiter to control access of the first wireless communication circuitry and the second wireless communication circuitry to the antenna, wherein the arbiter causes the packets of the first type to be transmitted and received by the first wireless communication circuitry during the time intervals during which no packets of the second type are transmitted or received by the second wireless communication circuitry.