Peter T. LiuFollow


The link quality indicator (LQI), a measure of the capacity of a Bluetooth channel, is too coarse to determine the fine-grained characteristics of the channel or the radio environment. This disclosure describes techniques that enable a Bluetooth host to monitor in a granular manner the retransmission count of each packet sent by a Bluetooth controller. The host can use the granular per-packet retransmission count for various purposes, e.g., to determine the instantaneous characteristics of the channel; to determine the change in the channel over time; to determine how other radios operated by the host may have affected the channel; to determine the radio signature (if any) of a user’s location and the change in the signature with time; to determine if the channel has excessive or insufficient retransmit opportunities; to switch transmission parameters on the fly; etc.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.