Invention Grant
US08971807B2 Systems and methods for low power short range wireless device communication advertisement 有权
低功率短距离无线设备通信广告系统和方法

Systems and methods for low power short range wireless device communication advertisement
Abstract:
The present invention relates to a system and method for improving directed connectable advertising in a low energy Bluetooth device. The host on the Bluetooth device configures an advertisement interval length, an advertisement window length, and a number of attempts. The advertisement window length is equal to or shorter than the advertisement interval length, which may be less than 1.28 seconds. Next, advertising packets are transmitted for the length of the advertising window on three advertising channels. Packets are transmitted consecutively, with no more than a 3.75 millisecond delay between packets, until the end of the advertisements window. After transmitting, a link layer of the Bluetooth device decrements the number of attempts. Once all attempts have been exhausted, the advertisements end. Otherwise, the link layer waits for the end of the advertisement interval. The link layer generates a pseudorandom delay between 0 and 10 milliseconds, and waits for this time to pass before initiating another advertisement interval with transmission during the advertisement window. If a connection is made at any point, the advertisement may be ended.
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