Dynamic time division duplex (dtdd) access for satellite ran
AssigneeAST & Science, LLC
InventorsZhi Zhong Yu, Federico Pedro Fawzi
Life of this patent
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Abstract
A ground station communicates with a satellite having a field of view (FOV), the satellite directly communicating with user equipment (UE) over uplink signals and downlink signals. The ground station has a Dynamic Time Division Duplex (DTDD) controller configured to establish UE uplink time slots during which the UE sends UE uplink signals, the UE uplink time slots based on a unique delay for the UE, whereby UE uplink signals are received at the satellite during a same satellite uplink time slot. The controller avoids overlapping uplink and downlink signals being received at the satellite, as well as at the UE.
Claims21
A satellite communication system, comprising:
- a first satellite configured for operative communication with a gateway device via a first feeder link and for direct communication with one or more user equipment (UE) over respective uplink signals and downlink signals, the first satellite having a first field of view (FOV) encompassing a first plurality of cells;
- and
- a second satellite configured for operative communication with the gateway device via a second feeder link and for direct communication with one or more UE over respective uplink signals and downlink signals, the second satellite having a second FOV encompassing a second plurality of cells, a selected one of the second plurality of cells corresponding to a selected one of the first plurality of cells;
- wherein:
- the first satellite is configured to receive, according to timing information received from the gateway device via the first feeder link, an uplink signal during a first time slot to a given one of the one or more UE located in the selected one of the first plurality of cells that corresponds to the selected one of the second plurality of cells;
- and
- the second satellite is configured to transmit, according to timing information received from the gateway device via the second feeder link, a downlink signal to the given UE during a second time slot that does not overlap with the first time slot.
A satellite communication system configured for communication with a satellite having a field of view (FOV), in which the satellite is configured to directly communicate with user equipment (UE) over uplink signals and downlink signals, the satellite communication system comprising:
- a controller having one or more processors configured to:
- segregate the FOV of the satellite into a plurality of concentric rings, each of the plurality of concentric rings being associated with a respective delay;
- establish a first UE uplink time slot having a first delay for a first one of the plurality of concentric rings, for transmission by a first UE located within the first concentric ring;
- and
- establish a second UE uplink time slot having a second delay for a second one of the plurality of concentric rings, for transmission by a second UE within the second concentric ring;
- wherein the first and second delays are established to avoid overlapping transmission between the first UE and the second UE.
Dependencies are inferred from the claim text.