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. An apparatus, comprising:
a transceiver configured to enable wireless communication; and
a processor communicatively coupled to the transceiver and configured to:
receive, via the transceiver, a frame of broadcast wireless data that comprises:
a plurality of portions that each include multiple orthogonal frequency division multiplexing (OFDM) symbols, wherein different ones of the plurality of portions have different frequency transform sizes; and
control data indicating one or more of the plurality of portions which the apparatus is permitted to access;
select, based on the control data, the one or more of the plurality of portions; and
decode the selected one or more portions to determine data represented by the OFDM symbols in the selected one or more portions.
2. The apparatus of claim 1 , wherein the one or more of the plurality of portions, which the apparatus is permitted to access, are determined based on permission control information provided by a broadcast gateway.
3. The apparatus of claim 1 , wherein the processor is further configured to:
determine that a velocity of the apparatus falls within a particular range of velocities, wherein the apparatus is configured to select the one or more of the plurality of portions based on the particular range.
4. The apparatus of claim 1 , wherein to select the one or more of the plurality of portions, the processor is configured to:
select the one or more of the plurality of portions based on one or more parameters that indicate whether to select local content for a first broadcast area or regional content for a second, greater broadcast area.
5. The apparatus of claim 1 , wherein OFDM symbols in different ones of the plurality of portions have different amounts of Doppler tolerance.
6. The apparatus of claim 1 , wherein the OFDM symbols in the selected one or more of the plurality of portions represent video content.
7. The apparatus of claim 1 , wherein the control data is specified within a physical partition data channel (PPDCH) descriptor.
8. The apparatus of claim 1 , wherein different ones of the plurality of portions have different cyclic prefix lengths.
9. A method, comprising:
receiving, via a transceiver, a frame of broadcast wireless data that comprises:
a plurality of portions that each include multiple orthogonal frequency division multiplexing (OFDM) symbols, wherein different ones of the plurality of portions have different frequency transform sizes; and
control data indicating one or more of the plurality of portions which an apparatus is permitted to access;
selecting, based at least on the control data, the one or more of the plurality of portions; and
decoding the selected one or more portions to determine data represented by the OFDM symbols in the selected one or more portions.
10. The method of claim 9 , wherein the one or more of the plurality of portions, which the apparatus is permitted to access, are determined based on permission control information provided by a broadcast gateway.
11. The method of claim 9 , further comprising:
determining that a velocity of the apparatus falls within a particular range of velocities, wherein the one or more of the plurality of portions are selected at least based on the particular range.
12. The method of claim 9 , wherein selecting the one or more of the plurality of portions further comprises:
selecting the one or more of the plurality of portions at least based on one or more parameters that indicate whether to select local content for a first broadcast area or regional content for a second, greater broadcast area.
13. The method of claim 9 , wherein the OFDM symbols in different ones of the plurality of portions have different amounts of Doppler tolerance.
14. The method of claim 9 , wherein the control data is specified within a physical partition data channel (PPDCH) descriptor.
15. A non-transitory computer-readable medium (CRM) having instructions stored thereon that are executable by an electronic device to perform operations comprising:
receiving, via a transceiver, a frame of broadcast wireless data that comprises:
a plurality of portions that each include multiple orthogonal frequency division multiplexing (OFDM) symbols, wherein different ones of the plurality of portions have different frequency transform sizes; and
control data indicating one or more of the plurality of portions which an apparatus is permitted to access;
selecting, based at least on the control data, the one or more of the plurality of portions; and
decoding the selected one or more portions to determine data represented by the OFDM symbols in the selected one or more portions.
16. The non-transitory CRM of claim 15 , wherein the one or more of the plurality of portions, which the apparatus is permitted to access, are determined based on permission control information provided by a broadcast gateway.
17. The non-transitory CRM of claim 15 , the operations further comprising:
determining that a velocity of the apparatus falls within a particular range of velocities, wherein the one or more of the plurality of portions are selected at least based on the particular range.
18. The non-transitory CRM of claim 15 , wherein selecting the one or more of the plurality of portions further comprises:
selecting the one or more of the plurality of portions at least based on one or more parameters that indicate whether to select local content for a first broadcast area or regional content for a second, greater broadcast area.
19. The non-transitory CRM of claim 15 , wherein the OFDM symbols in different ones of the plurality of portions have different amounts of Doppler tolerance.
20. The non-transitory CRM of claim 15 , wherein the control data is specified within a physical partition data channel (PPDCH) descriptor.