Generating control information for use in transmission with a multimedia stream to an audiovisual device
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 for generating control information for use in transmission of a data stream to a wireless receiver device, the method comprising:
generating first control information, wherein the first control information is for configuring the receiver device to decode a wirelessly received data stream, wherein the first control information is generated according to a first protocol version parameter and a first physical layer parameter;
generating first data, wherein the first data includes said first protocol version parameter and said first physical layer parameter indicating a physical layer structure of the first control information;
transmitting the first control information, the first data, and a first plurality of packets that include information specifying at least one data stream;
generating second control information, wherein the second control information is for configuring the receiver device to decode a data stream, wherein the second control information is generated according to a second protocol version parameter and a second physical layer parameter indicating a physical layer structure of the second control information;
generating second data, wherein the second data includes said second protocol version parameter and said second physical layer parameter indicating a structure of the second control information, wherein a value of said second physical layer parameter is different than a value of said first physical layer parameter, and wherein a portion of the structure of the second control information is different than the structure of the first control information and a portion of the structure of the second control information is the same as the structure of the first control information; and
transmitting the second control information, the second data, and a second plurality of packets that include information specifying at least one data stream.
2. The method of claim 1 , wherein the first data further includes information indicating a location of the first control information.
3. The method of claim 1 , wherein a location of the first data in transmission frames is fixed.
4. The method of claim 1 , wherein the first data is separate from the first control information.
5. The method of claim 1 , wherein the second data is usable by a receiving device to determine whether the second control information is supported by the receiving device.
6. The method of claim 1 , wherein said second physical layer parameter modifies a modulation scheme relative to a modulation scheme indicated by the first physical layer parameter.
7. The method of claim 1 , wherein said second physical layer parameter alters placement of training data relative to placement indicated by the first physical layer parameter.
8. The method of claim 1 , wherein said first physical layer parameter specifies a low density parity check (LDPC) characteristic for the first control information.
9. The method of claim 1 , wherein the data stream is a multimedia stream.
10. The method of claim 1 , wherein the structure of said second control information includes one or more fields not included in said first control information.
11. The method of claim 1 , wherein the structure of said second control information omits one or more fields in said first control information.
12. The method of claim 1 , wherein the second physical layer parameter modifies forward error correction relative to forward error correction indicated by the first physical layer parameter.
13. The method of claim 1 , wherein the first control information indicates a code rate for the data stream.
14. The method of claim 1 , wherein the first control information indicates a forward error correction type for the data stream.
15. The method of claim 1 , wherein the first control information indicates an interleaving length.
16. The method of claim 1 , wherein the first control information includes a parameter for low density parity check (LDPC) encoding.
17. An apparatus configured to decode a wirelessly received data stream, comprising:
one or more processors; and
one or more memories having program instructions thereon that are executable by the one or more processors to:
receive one or more first frames of wireless data that include: first data, first control information, and a first plurality of packets, wherein said first data includes one or more first physical layer parameters;
determine a physical layer structure of the first control information based on the first data;
decode the first control information based on the determined structure of the first control information;
decode the first plurality of packets based on the first control information;
receive one or more second frames of wireless data that include: second data, second control information, and a second plurality of packets, wherein said second data includes one or more second physical layer parameters having one or more different values than said one or more first physical layer parameters;
determine a physical layer structure of the second control information based on the second data, wherein a portion of the structure of the second control information is different than the structure of the first control information and a portion of the structure of the second control information is the same as the structure of the first control information;
decode the second control information based on the determined structure of the first control information; and
decode the second plurality of packets based on the second control information.
18. The apparatus of claim 17 , wherein the first data indicates a location of the first control information.
19. The apparatus of claim 17 , wherein a location of the first data within the one or more first frames and a location of the second data within the one or more second frames is the same.
20. The apparatus of claim 17 , wherein the first data is separate from the first control information and the second data is separate from the second control information.
21. The apparatus of claim 17 , wherein the instructions are further executable to determine that the apparatus supports the second control information, based on the second data.
22. The apparatus of claim 17 , wherein said first data and said second data each comprise a respective protocol version parameter.
23. The apparatus of claim 17 , wherein said one or more first physical layer parameters indicate the modulation and length of said first control information, and wherein said one or more second physical layer parameter indicate the modulation and length of said second control information.
24. The apparatus of claim 17 , wherein said one or more first physical layer parameters and one or more second one or more first physical layer parameters respectively indicate forward error correction type.
25. The apparatus of claim 17 , wherein said first control information indicates at least one of:
a code rate for the data stream;
a forward error correction type for the data stream;
interleaving length; or
use of low density parity check (LDPC) encoding.
26. A non-transitory computer-readable medium having instructions stored thereon that are executable by a computing device to perform operations comprising:
generating first control information, wherein the first control information is for configuring the computing device to decode a wirelessly received data stream, wherein the first control information is generated according to a first protocol version parameter and a first physical layer parameter;
generating first data, wherein the first data includes said first protocol version parameter and said first physical layer parameter indicating a physical layer structure of the first control information;
transmitting the first control information, the first data, and a first plurality of packets that include information specifying at least one data stream;
generating second control information, wherein the second control information is for configuring the computing device to decode a data stream, wherein the second control information is generated according to a second protocol version parameter and a second physical layer parameter indicating a physical layer structure of the second control information;
generating second data, wherein the second data includes said second protocol version parameter and said second physical layer parameter indicating the structure of the second control information, wherein a value of said second physical layer parameter is different than a value of said first physical layer parameter, and wherein a portion of the structure of the second control information is different than the structure of the first control information and a portion of the structure of the second control information is the same as the structure of the first control information; and
transmitting the second control information, the second data, and a second plurality of packets that include information specifying at least one data stream.
27. The non-transitory computer-readable medium of claim 26 , wherein said second physical layer parameter modifies an modulation scheme relative to a modulation scheme indicated by the first physical layer parameter.
28. The non-transitory computer-readable medium of claim 26 , wherein the structure of said second control information includes one or more fields not included in said first control information.
29. The non-transitory computer-readable medium of claim 26 , wherein the second physical layer parameter modifies forward error correct relative to forward error correction indicated by the first physical layer parameter.
30. A method for generating control information for use in transmission of a data stream to a wireless receiver device, the method comprising:
generating first control information, wherein the first control information is for configuring the receiver device to decode a wirelessly received data stream, wherein the first control information is generated according to a first protocol version parameter and a first physical layer parameter, wherein the first control information indicates a code rate for the data stream, wherein the first control information indicates a forward error correction type for the data stream, and wherein the first control information includes a parameter for low density parity check (LDPC) encoding;
generating first data, wherein the first data includes said first protocol version parameter and said first physical layer parameter indicating a physical layer structure of the first control information, wherein the first data indicates a location of the first control information and;
transmitting the first control information, the first data, and a first plurality of packets that include information specifying at least one data stream;
generating second control information, wherein the second control information is for configuring the receiver device to decode a data stream, wherein the second control information is generated according to a second protocol version parameter and a second physical layer parameter, wherein said second physical layer parameter modifies an modulation scheme relative to a modulation scheme indicated by the first physical layer parameter;
generating second data, wherein the second data includes said second protocol version parameter and said second physical layer parameter indicating a physical layer structure of the second control information, wherein a value of said second physical layer parameter is different than a value of said first physical layer parameter, and wherein a portion of the structure of the second control information is different than the structure of the first control information and a portion of the structure of the second control information is the same as the structure of the first control information; and
transmitting the second control information, the second data, and a second plurality of packets that include information specifying at least one data stream.