Single channel bi-directional communications control
A method of allocating time for uplink communications between a remote control unit and a drone system includes interrupting downlink communications from the drone.
1. A system comprising:
a drone comprising:
a video acquisition unit, to acquire video;
a video data queue, to temporarily store acquired video data that is intended to be wirelessly transmitted over a Wi-Fi downlink upon availability of a Wi-Fi transmission opportunity in accordance with a Wi-Fi Carrier-Sense-Multiple-Access (CSMA) scheme;
a Wi-Fi transceiver, to wirelessly transmit video over a Wi-Fi downlink towards a Wi-Fi receiver of a drone operator unit, and to wirelessly receive control commands over a Wi-Fi uplink from a Wi-Fi transmitter of said drone operator unit, wherein said Wi-Fi downlink and said Wi-Fi uplink utilize a single same Wi-Fi communication channel;
an uplink traffic monitor, (a) to continuously monitor incoming control commands that said drone receives from said drone operator unit over said Wi-Fi uplink, and (b) to detect that a control command was not received from said drone operator unit over said Wi-Fi uplink for at least T seconds, and to activate a downlink starving unit;
a downlink starving unit, to starve said Wi-Fi transceiver of said drone from having video data intended for Wi-Fi transmission over said downlink, for a pre-defined starving period;
wherein the Wi-Fi transceiver of said drone, which is starved from having video data intended for Wi-Fi transmission over said downlink, ceases to transmit video data over said Wi-Fi downlink for said pre-defined starving period and vacates said single Wi-Fi channel to be available for uplink Wi-Fi transmission of one or more control commands from said drone operator unit to said drone.
2. The system of claim 1 ,
wherein the downlink starving unit performs diversion of acquired video data, originating from said video acquisition unit, towards a temporary video dump in said drone, instead of towards said video data queue that is intended for downlink Wi-Fi transmission.
3. The system of claim 1 ,
wherein the downlink starving unit performs starving of said video data queue for a pre-defined starving period that is a sum of (I) a longest time-period that is required for Wi-Fi transmission of a single control command to said drone, plus (II) a longest expected Wi-Fi CSMA backoff time-period that is expected for said Wi-Fi CSMA scheme utilized by said drone and said drone operator unit.
4. The system of claim 1 ,
wherein the downlink starving unit prevents supplying of new acquired video data to a Multiple Access Controller (MAC) of said Wi-Fi transceiver of said drone for said pre-defined starving period.
5. The system of claim 1 ,
wherein the downlink starving unit prevents supplying of new acquired video data to a Multiple Access Controller (MAC) of said Wi-Fi transceiver of said drone for said pre-defined starving period; wherein the downlink starving unit operates in a communication layer that is above the MAC layer.
6. The system of claim 1 ,
wherein video starving operations of the downlink starving unit of said drone, enable the Wi-Fi transmitter of the drone operator unit to gain access to a Wi-Fi CSMA transmission opportunity and to successfully transmit a control command over said Wi-Fi uplink to said Wi-Fi transceiver of said drone.