Multi-portion radio transmissions
Techniques are disclosed relating to generating and receiving radio frames with multiple portions that have different target geographic areas. A data frame may include a first partition that includes a physical layer encoding of first data to be transmitted in a first geographic area, where the first geographic area is defined by a first threshold distance from the one or more transmitters. The data frame may include a second that includes a physical layer encoding of second data to be transmitted in a second geographic area, where the second geographic area is defined by a second, greater threshold distance from the one or more transmitters.
1. A system, comprising:
one or more processors configured to determine a data frame; and
one or more transmitters configured to wirelessly broadcast the data frame;
wherein the data frame comprises:
a first portion that includes a physical layer encoding of first data to be transmitted in a first geographic area, wherein the first geographic area is defined by a first threshold distance from the one or more transmitters, and wherein the first threshold distance corresponds to a range attainable with a first cyclic prefix associated with the physical layer encoding of the first data; and
a second portion that includes a physical layer encoding of second data to be transmitted in a second geographic area, wherein the second geographic area is defined by a second, greater threshold distance from the one or more transmitters, and wherein the second threshold distance corresponds to a range attainable with a second cyclic prefix associated with the physical layer encoding of the second data.
2. The system of claim 1 , wherein the data frame further comprises control data that indicates which of multiple portions included in the data frame include data for which geographic area.
3. The system of claim 2 , wherein the control data is included in a preamble portion of the data frame.
4. The system of claim 1 , wherein the data frame further comprises one or more non-payload regions and one or more payload regions, wherein all of the one or more non-payload regions of the data frame precede the one or more payload regions in the data frame.
5. The system of claim 1 , wherein to determine the data frame, the one or more processors are configured to generate the data frame according to transmission control information from another computing system.
6. The system of claim 1 , wherein to determine the data frame, the one or more processors are configured to receive the data frame from another computing system.
7. The system of claim 1 , wherein to determine the data frame, the one or more processors are configured to generate the data frame according to physical layer instructions received from another computing system.
8. The system of claim 1 , wherein the second cyclic prefix associated with the physical layer encoding of the second data provides a greater target distance for wireless transmission than the first cyclic prefix associated with the physical layer encoding of the first data.
9. The system of claim 1 , wherein the first and second portions encode different types of video content.
10. The system of claim 9 , wherein the different types of video content encoded by different portions have one or more differences from the following list of differences:
different video quality levels;
different programming content; and
different video encoding techniques.
11. An apparatus, comprising:
one or more processors configured to:
receive, via a wireless radio, a wirelessly broadcast data frame that comprises:
a first portion that includes a physical layer encoding of first data to be transmitted in a first geographic area, wherein the first geographic area is defined by a first threshold distance from one or more transmitters used to broadcast the data frame, and wherein the first threshold distance corresponds to a range attainable with a first cyclic prefix associated with the physical layer encoding of the first data; and
a second portion that includes a physical layer encoding of second data to be transmitted in a second geographic area, wherein the second geographic area is defined by a second, greater threshold distance from the one or more transmitters, and wherein the second threshold distance corresponds to a range attainable with a second cyclic prefix associated with the physical layer encoding of the second data.
12. The apparatus of claim 11 , wherein the one or more processors are further configured to:
select one, but not both, of the first portion and the second portion of the data frame to decode based on control data that indicates properties of the first and second portions.
13. The apparatus of claim 12 , wherein the one or more processors are configured to select the one, but not both, of the first portion and the second portion based on a user input.
14. The apparatus of claim 12 , wherein the one or more processors are configured to select the one, but not both, of the first portion and the second portion based on current operating conditions of the apparatus.
15. The apparatus of claim 11 , wherein the data frame further comprises preamble control data that indicates which of multiple portions included in the data frame include data for which geographic area.
16. The apparatus of claim 11 , wherein the first and second portions encode different types of video content.
17. A method, comprising:
determining, by one or more processors, a data frame, wherein the data frame comprises:
a first portion that includes a physical layer encoding of first data to be transmitted in a first geographic area, wherein the first geographic area is defined by a first threshold distance from one or more transmitters used to broadcast the data frame, and wherein the first threshold distance corresponds to a range attainable with a first cyclic prefix associated with the physical layer encoding of the first data; and
a second portion that includes a physical layer encoding of second data to be transmitted in a second geographic area, wherein the second geographic area is defined by a second, greater threshold distance from the one or more transmitters, and wherein the second threshold distance corresponds to a range attainable with a second cyclic prefix associated with the physical layer encoding of the second data; and
wirelessly broadcasting, by one or more transmitters, the data frame.
18. The method of claim 17 , wherein the data frame further comprises control data that indicates which of multiple portions included in the data frame include data for which geographic area.
19. The method of claim 17 , wherein the data frame further comprises one or more non-payload regions and one or more payload regions, wherein all of the one or more non-payload regions of the data frame precede the one or more payload regions in the data frame.
20. The method of claim 17 , wherein the second cyclic prefix associated with the physical layer encoding of the second data provides a greater target distance for wireless transmission than the first cyclic prefix associated with the physical layer encoding of the first data.