解释下 Subevent Code: LE Channel Selection Algorithm
时间: 2024-04-04 14:35:50 浏览: 8
Subevent Code: LE Channel Selection Algorithm是蓝牙低功耗(LE)协议中的一个子事件码,用于指示LE设备在扫描过程中选择使用哪个信道进行通信。
在LE协议中,设备可以在37个信道中的任意一个上进行广播或扫描。为了避免不同设备在同一信道上发生冲突,LE设备需要使用一种算法来选择一个可用的信道进行通信。Subevent Code: LE Channel Selection Algorithm就是用来触发这个算法的子事件码。
该子事件码会在LE设备进行扫描操作时触发,设备会根据周围的信道状况和已经使用的信道情况,选择一个最佳的信道进行通信。这个算法的目的是尽可能地减少信道冲突,提高通信的可靠性和稳定性。
需要注意的是,Subevent Code: LE Channel Selection Algorithm只是触发算法的一个指令,具体的算法实现是由LE设备自己完成的,因此不同的设备可能会有不同的算法实现和结果。
相关问题
A device can use an isochronous physical channel to broadcast isochronous data by using isochronous connectionless logical transports. An isochronous connectionless logical transport is referred to as a Broadcast Isochronous Stream (BIS). A BIS consists of BIS events that occur at regular intervals (designated ISO_Interval). Every BIS event consists of one or more subevents. In every subevent, a broadcasting device transmits an isochronous data packet. Each subevent uses a PHY channel that is determined using the channel selection algorithm. A device can transmit several BISes with synchronized timing; this is referred to as a Broadcast Isochronous Group (BIG). The various BIS events together form a BIG event. The device can also use the isochronous physical channel to broadcast control information in a Control subevent, which is transmitted at the end of all subevents for a BISBIG, as shown in Figure 1.5.
设备可以使用同步物理通道通过使用同步无连接逻辑传输来广播同步数据。同步无连接逻辑传输称为广播同步流(BIS)。BIS由定期发生的BIS事件组成(指定为ISO_Interval)。每个BIS事件由一个或多个子事件组成。在每个子事件中,广播设备传输同步数据包。每个子事件使用的PHY通道是通过使用通道选择算法确定的。设备可以使用同步物理通道以同步的时间传输多个BIS,这被称为广播同步组(BIG)。各种BIS事件一起形成BIG事件。设备还可以使用同步物理通道在控制子事件中广播控制信息,该子事件在BISBIG的所有子事件结束时传输,如图1.5所示。
Using an ACL connection, a Central can establish one or more isochronous connections that use the isochronous physical channel. An isochronous connection is used to transfer isochronous data between the Central and a Peripheral by using a logical transport, which is referred to as a Connected Isochronous Stream (CIS). A CIS consists of CIS events that occur at regular intervals (designated ISO_Interval). Every CIS event consists of one or more subevents. In each subevent, the Central transmits once and the Peripheral responds. If the Central and Peripheral have completed transferring the scheduled isochronous data in a CIS event, all remaining subevents in that event will have no radio transmissions and the event is closed. Each subevent uses a PHY channel which is determined by using the channel selection algorithm. The PHY channel that is used for a subevent is marked as ISO Ch(eventcount, subeventcount), as shown in Figure 1.4.
通过ACL连接,中央设备可以建立一个或多个使用同步物理通道的同步连接。同步连接用于通过逻辑传输(称为连接的同步流,CIS)在中央设备和外围设备之间传输同步数据。CIS由定期发生的CIS事件组成(指定为ISO_Interval)。每个CIS事件由一个或多个子事件组成。在每个子事件中,中央设备发送一次,外围设备进行响应。如果中央设备和外围设备已经完成了在CIS事件中预定的同步数据传输,则该事件中所有剩余的子事件将没有无线电发射,事件将被关闭。每个子事件使用的PHY通道是通过使用通道选择算法确定的。用于子事件的PHY通道标记为ISO Ch(事件计数,子事件计数),如图1.4所示。