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Figure 3 - Signal spectrum: a - carrier frequency, b - modulated signal

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radioframe_size
radioframe_size
Radio frame

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period

To explain the radio frame size period effect on the link quality parameters, let's look at the connection of two devices (InfiLINK XG/InfiLINK XG 1000 or R5000 with TDMA firmware). The transmitting information mechanism in the radio medium is presented below (see Figure 4). For detailed description of the data transfer mechanisms for TDMA and Polling see TDMA and Polling: Application features. A radio frame is a time period within which a subscriber terminal is serviced by a sector. During one radio frame, data is exchanged between two devices in the downstream and upstream.

Similar to Ethernet frames, a part of the radio frame is allocated for service traffic. In particular, the synchronization field and guard interval are obligatory and do not depend on radio frame size. The period The remaining time useful data is transmitted. Thus, same as the Ethernet frames, a longer radio frame length will lead to more efficient utilization of the communication channel, but the delay value will increase (the next data packet can be transmitted only in the next transmission interval, and the longer the radio frame is, the longer the waiting time).

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Let's add to the picture from the "Radio frame sizeperiod", section two more subscriber devices (see Figure 5).

The transmission waiting time is proportional to the number of subscriber devices, since a time interval equal to the radio frame size is period is allocated for data exchange with each station. Thus, the delay value depends on the number of active subscribers.

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