Optimizing transmission for broadcast multicast service

Abstract

The present invention is method and system for transmitting a signal in a wireless communication system. The present invention includes differentiating a data stream into at least a first layer data stream and a second layer data stream. At least the first layer data stream and the second layer data stream are then channel coded. Afterward, at least one of the channel coded first layer data stream and the channel coded second layer data stream is spread.

What is claimed is: 
     
       1. A method for transmitting a signal in a wireless communication system, the method comprising:
 differentiating a data stream into at least a first layer data stream and a second layer data stream; 
 channel coding at least each of the first layer data stream and the second layer data stream streams; 
 spreadingprecoding the channel coded first layer data stream using a Walsh-Hadmard matrix; and 
 spreadingprecoding the channel coded second layer data stream using an identity matrix. 
 
     
     
       2. The method of  claim 1 , further comprising applying a Fourier transform to at least one of the channel coded first layer data stream and the channel coded second layer data stream. 
     
     
       3. The method of  claim 2 , further comprising transmitting the transformed precoded first layer data stream and second layer data stream streams according to at least one of a channel condition and a quality of service requirement of the data stream to be transmitted. 
     
     
       4. The method of  claim 1 , wherein the first layer is an enhancement layer and the second layer is a base layer. 
     
     
       5. The method of  claim 1 , further comprising applying at least one of power control, phase adjusting and subcarrier mapping to at least one of the spread channel coded precoded first layer data stream and the spread channel coded precoded second layer data stream. 
     
     
       6. The method of  claim 1 , wherein the data stream includes a flow description message comprising a transmit mode extension field. 
     
     
       7. The method of  claim 1 , wherein the data stream is transmitted along with a flow description message comprising a transmit mode extension field. 
     
     
       8. The method of  claim 1 , wherein the data stream includes a system parameters message comprising a control channel transmit mode extension field. 
     
     
       9. The method of  claim 1 , wherein the data stream is transmitted with a system parameters message comprising a control channel transmit mode extension field. 
     
     
       10. A system An apparatus for transmitting a signal in a wireless communication system, the system apparatus comprising:
 a processor for differentiating a data stream into at least a first layer data stream and a second layer data stream, channel coding at least each of the first layer data stream and the second layer data stream streams, spreading precoding the channel coded first layer data stream using a Walsh-Hadmard matrix and spreading precoding the channel coded second layer data stream using an identity matrix. 
 
     
     
       11. The system apparatus of  claim 10 , wherein the processor applies a Fourier transform to at least one of the channel coded first layer data stream and the channel coded second layer data stream. 
     
     
       12. The system apparatus of  claim 11 , wherein the processor transmits the transformed precoded first layer data stream and second layer data stream streams according to at least one of a channel condition and a quality of service requirement of the data stream to be transmitted. 
     
     
       13. The system apparatus of  claim 10 , wherein the first layer is an enhancement layer and the second layer is a base layer. 
     
     
       14. The system apparatus of  claim 10 , wherein the processor applies at least one of power control, phase adjusting and subcarrier mapping to at least one of the spread channel coded precoded first layer data stream and the spread channel coded precoded second layer data stream. 
     
     
       15. The system apparatus of  claim 10 , wherein the data stream includes a flow description message comprising a transmit mode extension field. 
     
     
       16. The system apparatus of  claim 10 , wherein the data stream is transmitted along with a flow description message comprising a transmit mode extension field. 
     
     
       17. The system apparatus of  claim 10 , wherein the data stream includes a system parameters message comprising a control channel transmit mode extension field. 
     
     
       18. The system apparatus of  claim 10 , wherein the data stream is transmitted with a system parameters message comprising a control channel transmit mode extension field.