Control information for a wirelessly-transmitted data stream
Control information for configuring an audiovisual device to present multimedia content according to a first service type may be generated. A method may include generating first control information for configuring an audiovisual device to decode a multimedia stream, generating first data that indicates a structure of the first control information, and transmitting the first data and the first control information. The first control information may be generated according to a first protocol version. Second data and second control information may be similarly generated and transmitted according to a second protocol version. Disclosed techniques may facilitate receiving devices to determine whether they support received wireless transmissions and decode the transmissions based on the control information.
1. A method, comprising:
wirelessly transmitting, by a computing system, first and second frames that each include respective: first control information, second control information, and one or more packets;
determining the first control information, by the computing system, wherein the first control information indicates configuration of one or more receiver devices to decode a wirelessly received data stream that includes the packets and wherein the first control information is generated according to different protocol version parameters and has a different physical layer structure for the first and second frames; and
determining the second control information, by the computing system, wherein the second control information specifies:
a physical layer parameter of the corresponding first control information that indicates the physical layer structure of the first control information; and
the protocol version parameter for the corresponding first control information.
2. The method of claim 1 , wherein the second control information indicates a location of the first control information in the corresponding frame.
3. The method of claim 2 , wherein a location of the second control information in transmission frames is fixed.
4. The method of claim 1 , wherein the second control information is separate from the first control information.
5. The method of claim 1 , wherein the second control information for the second frame is usable by a receiving device to determine whether the first control information for the second frame is supported by the receiving device.
6. The method of claim 1 , wherein the physical layer parameter indicates modulation and length of the first control information.
7. The method of claim 1 , wherein the first physical layer parameter specifies a training data characteristic for the first control information.
8. The method of claim 1 , wherein the first physical layer parameter specifies a raptor code characteristic for the first control information.
9. The method of claim 1 , wherein the first physical layer parameter indicates a forward error correction type for the first control information.
10. The method of claim 1 , wherein the data stream is a multimedia stream.
11. The method of claim 1 , wherein the first control information for the second frame includes one or more fields that are not included in the first control information for the first frame.
12. The method of claim 11 , wherein the first control information for the second frame omits one or more fields that are included in the first control information for the first frame.
13. The method of claim 1 , wherein the first control information indicates a code rate.
14. The method of claim 1 , wherein the first control information indicates an interleaving length.
15. The method of claim 1 , wherein the first control information includes a parameter for low density parity check (LDPC) encoding.
16. An apparatus, comprising:
one or more processors; and
one or more memories having program instructions stored thereon that are executable by the one or more processors to:
wirelessly receive first and second frames that each include respective: first control information, second control information, and one or more packets, wherein the first control information indicates configuration of the apparatus to decode a wirelessly received data stream that includes the packets and wherein the first control information is generated according to different protocol version parameters and has a different physical layer structure for the first and second frames and wherein the second control information specifies:
a physical layer parameter of the corresponding first control information that indicates the physical layer structure of the first control information; and
the protocol version parameter for the corresponding first control information;
determine a physical layer structure of the respective first control information based on the respective second control information;
decode the respective first control information based on the determined physical layer structure; and
decode the packets of the respective first and second frames based on the decoded respective first control information.
17. The apparatus of claim 16 , wherein the first control information indicates at least one parameter from the following parameters:
a code rate for the data stream;
interleaving length; and
a parameter for low density parity check (LDPC) encoding.
18. The apparatus of claim 16 , wherein the second control information indicates a location of the first control information in the corresponding frame.
19. The apparatus of claim 16 , the physical layer parameter includes one or more of the following parameters:
modulation and length of the first control information;
a training data characteristic for the first control information;
a low density parity check (LDPC) characteristic for the first control information; and
a forward error correction type for the first control information.
20. A non-transitory computer-readable medium having instructions stored thereon that are executable by a computing device to perform operations comprising:
wirelessly transmitting first and second frames that each include respective: first control information, second control information, and one or more packets;
determining the first control information, wherein the first control information indicates configuration of one or more receiver devices to decode a wirelessly received data stream that includes the packets and wherein the first control information is generated according to different protocol version parameters and has a different physical layer structure for the first and second frames; and
determining the second control information, wherein the second control information specifies:
a physical layer parameter of the corresponding first control information that indicates the physical layer structure of the first control information; and
the protocol version parameter for the corresponding first control information.