Bluetooth Antenna Selection for Coexistence Interference
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Solution Overview
Problem
Concurrent usage of multiple wireless connections in user equipment (UE) can lead to interference, particularly affecting Bluetooth connections, resulting in dropped packets and increased power consumption due to retransmissions, as existing antenna diversity methods fail to adequately mitigate interference from other wireless connections.
Innovation Solution
The UE employs an adaptive antenna selection mechanism using antenna diversity with multiple Bluetooth and cellular antennas, determining individual and combined expected interference to select the optimal Bluetooth antenna for communication, based on adaptive frequency hopping maps and coexistence policy tables, to minimize interference and improve link quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If antenna diversity is used to establish Bluetooth connection, then connection reliability may be improved, but interference from other wireless connections still causes packet loss and requires retransmissions
Solution Approach 1:
The system performs preliminary interference assessment by determining expected interference from cellular and WiFi connections before Bluetooth transmission. This allows the Bluetooth antenna to proactively select channels that avoid anticipated interference, preventing packet loss before it occurs and eliminating the need for retransmissions
Solution Approach 2:
The system dynamically changes Bluetooth transmission parameters (frequency channels) based on real-time interference conditions from other wireless connections. By adjusting the operating frequency according to cellular and WiFi activity, the system avoids interference-induced packet loss and reduces retransmission power consumption
2Adaptability or versatility
If multiple wireless connections are used concurrently, then communication versatility is improved, but interference between connections increases
Solution Approach 1:
The system applies different frequency channel selections to different Bluetooth antennas based on their specific interference environments. Each antenna combination with cellular or WiFi antennas receives a customized interference assessment and corresponding channel recommendation, allowing localized optimization for each wireless connection pair
Solution Approach 2:
The system introduces an intermediary interference assessment mechanism that mediates between multiple wireless connections. This intermediary layer evaluates expected interference from cellular and WiFi connections and uses this information to guide Bluetooth channel selection, harmonizing coexistence of multiple concurrent connections
3Measurement precision
If Bluetooth protocol constantly checks for best channels, then connection quality may be improved, but additional retransmission attempts are required due to interference
Solution Approach 1:
The system performs preliminary channel assessment by determining expected interference from other wireless connections before transmission attempts. This pre-assessment identifies the best channels in advance, eliminating the need for constant channel checking and reducing retransmission attempts caused by interference on poorly selected channels
Data Source
AI summary
Devices, systems, and methods utilize coexistence-based frequency hopping. Methods are performed at a user equipment including an antenna arrangement comprising a first plurality of antennas configured for use with a first connection and a second plurality of antennas configured for use with a second connection. The methods include determining, for each of a plurality of combinations of one of the first antennas and one of the second antennas, an individual expected interference limiting a number of usable channels for the first connection. The methods include determining a combined expected interference based at least in part on at least one of the individual expected interferences. The methods also include selecting, based at least in part on the combined expected interference, an operational antenna of the first plurality of antennas for communication associated with the first connection.