Bluetooth Low Energy single channel connection event tws earbuds compatible with iphone

All communication between master and slave devices occurs in connection events. A connection event consists of a data packet sent by the master device first, followed by a series of data packets sent by the slave device and the master device alternately. In the Bluetooth V11 standard, each data packet - whether from a master or a slave device - is transmitted on a different channel. For example, the master device sends a data packet to the slave device on a certain channel, and the response message will be sent through another channel. The problem with this is that even if the slave successfully completes the reception, there may be interference on the next channel on which the reply is sent, causing the acknowledgment packet to the master to fail to arrive. www.bjbjaudio.com

Bluetooth v12 added adaptive frequency hopping, where each transmission from a slave device uses the same channel as the master device. In the previous example, the slave device will transmit data on the same channel as the master device, so the probability of successful delivery of the data packet is greatly increased. The above conclusion is based on the fact that if the data packet sent by the master device to the slave device is intact, the data transmitted in the reverse direction will also be intact. This is a correct assumption and has increased the actual data transfer rate in some heavily interfered scenarios. www.bjbjaudio.com   <a style="opacity:0.0;color:#ffffff">tws earbuds compatible with iphone</a>             <a style="opacity:0.0;color:#ffffff">tws earbuds compatible with iphone</a>

Bluetooth Low Energy continues the above logical conclusion. Since a good channel is found, why not use it. Of course, a good channel should be used for as long as possible. Based on this common sense, we may eventually get the conclusion of "disable frequency hopping". After all, if data can arrive, it should stay on that frequency until it doesn't work and switch to another channel. www.bjbjaudio.com

Unfortunately, the moment a frequency change is required, the device cannot send any signaling to coordinate the change. Because once the channel fails, it takes a lot of energy to re-synchronize. Given the transient nature of interference, especially the bursty nature of Internet traffic in Wi-Fi networks, this pattern is prone to problems. www.bjbjaudio.com

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In addition, the single-channel model reduces the number of networks in the same channel, since networks in the same area automatically choose clean frequencies. Even if the number of clean channels is limited, there will not be too many networks crowded on the same channel. The frequency hopping algorithm distributes network traffic in the time and frequency domains, allowing a large number of networks to work in the same area. The alternative algorithm of "stay at one frequency until it fails" doesn't work. The approach used by Bluetooth Low Energy is to keep one frequency for sending data and acknowledgments within a connection event, and then switch to another frequency when the next connection event arrives. At any point in time, the frequencies used by Bluetooth Low Energy are completely deterministic. If any channel is not working, both devices will immediately deactivate that channel, resynchronize using the new channel on the next connect event and continue sending data. This means that even in places filled with unknown disturbances, such as in many homes and businesses, the latency impact of data streams is minimized. www.bjbjaudio.com

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