Multi-portion radio transmissions
Techniques are disclosed relating to generating and receiving radio frames with multiple portions that have different encoding schemes. An apparatus may include one or more processing elements configured to receive, via a wireless radio, wireless data that includes a plurality of portions that each include multiple orthogonal frequency-division multiplexing (OFDM) symbols. Different ones of the portions have different frequency transform sizes and different sampling rates. The wireless data may also include control data that indicates the frequency transform sizes and sampling rates for the ones of the portions. The apparatus may select, based on the control data and a determined velocity of the apparatus, one or more but not all of the plurality of portions and may decode the selected one or more portions to determine data represented by the OFDM symbols in the selected one or more portions. Different portions of the wireless data may be adapted for decoding by devices moving at different maximum velocities.
1. An apparatus, comprising:
one or more processing elements configured to:
receive, via a wireless radio, wireless data that includes:
a plurality of portions that each include multiple orthogonal frequency-division multiplexing (OFDM) symbols, wherein different ones of the portions have different frequency transform sizes and different sampling rates; and
control data that indicates the frequency transform sizes and sampling rates for the ones of the portions;
select, based on the control data and a determined velocity of the apparatus, one or more but not all 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 a first one of the plurality of portions has a first frequency transform size and a first sampling rate that are adapted for decoding by mobile devices moving at velocities up to a first maximum velocity and wherein a second one of the plurality of portions has a second frequency transform size and a second sampling rate that are adapted for decoding by mobile devices moving at velocities up to a second, different maximum velocity.
3. The apparatus of claim 1 , wherein OFDM symbols in different ones of the portions have different time lengths in the time dimension.
4. The apparatus of claim 1 , wherein the portions are divided in at least one of the time dimension or the frequency dimension.
5. The apparatus of claim 1 , wherein different ones of the portions have different cyclic prefix lengths.
6. The apparatus of claim 1 , wherein the different frequency transform sizes correspond to different Fast Fourier Transform (FFT) sizes.
7. The apparatus of claim 1 , wherein ones of the portions are generated to have different amounts of Doppler tolerance.
8. The apparatus of claim 1 , wherein ones of the portions are different frames of wireless data.
9. A method, comprising:
receiving or generating, by a wireless base station, a payload data for one or more transmissions of wireless data, wherein the payload data includes a plurality of portions that each include multiple orthogonal frequency-division multiplexing (OFDM) symbols, wherein different ones of the portions have different frequency transform sizes for the OFDM symbols in the ones of the portions;
wherein a first one of the plurality of portions has a first frequency transform size and a first sampling rate and wherein a second one of the plurality of portions has a second frequency transform size and a second sampling rate; and
broadcasting, by the wireless base station, wireless data including the payload data.
10. The method of claim 9 , wherein the first one of the plurality of portions is adapted for decoding by mobile devices moving at velocities in a first range of velocities and wherein the second one of the plurality of portions is adapted for decoding by mobile devices moving at velocities in a second, different range of velocities.
11. The method of claim 9 , wherein the portions are divided in at least one of the time dimension or the frequency dimension.
12. The method of claim 9 , further comprising generating different ones of the portions to have different amounts of Doppler tolerance.
13. The method of claim 9 , further comprising broadcasting control information that indicates, for ones of the portions, frequency transform size and sampling rate.
14. The method of claim 9 , wherein the different frequency transform sizes correspond to different Fast Fourier Transform (FFT) sizes.
15. The method of claim 9 , further comprising generating different ones of the portions to have different cyclic prefix lengths.
16. A non-transitory computer-readable medium having instructions stored thereon that are executable by an electronic device to perform operations comprising:
receiving a frame of broadcast wireless data that includes:
a plurality of portions that each include multiple orthogonal frequency-division multiplexing (OFDM) symbols, wherein different ones of the portions have different frequency transform sizes and different sampling rates; and
control data that indicates frequency transform sizes and sampling rates for the ones of the portions;
selecting, based on the control data, one or more but not all 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.
17. The non-transitory computer-readable medium of claim 16 , wherein a first one of the plurality of portions has a first frequency transform size and a first sampling rate that are adapted for decoding by mobile devices moving at velocities up to a first maximum velocity and wherein a second one of the plurality of portions has a second frequency transform size and a second sampling rate that are adapted for decoding by mobile devices moving at velocities up to a second, different maximum velocity.
18. The non-transitory computer-readable medium of claim 16 , wherein the portions are divided in at least one of the time dimension or the frequency dimension.
19. The non-transitory computer-readable medium of claim 16 , wherein ones of the portions are generated to have different amounts of Doppler tolerance.
20. The non-transitory computer-readable medium of claim 16 , wherein ones of the portions are different frames of wireless data.