Adaptive error resilience for streaming video transmission over a wireless network

Abstract

The invention relates to a method of transmitting a signal over a communication network. The method comprises transmitting the signal and transmitting proactive repair redundancy information.

1 . A method of adding error resiliency to a signal, the method comprising: 
 estimating a level of signal protection required, wherein a first plurality data packets in the signal is associated with a first level of protection and a second plurality data packets in the signal is associated with a second level of protection:    adding proactive repair redundancy information to the first data packet;    adding a first plurality of repair packets based on the first level of protection: and transmitting the signal.    
   
   
       2 . The method of  claim 1 , wherein the signal is transmitted over a wireless channel.  
   
   
       3 . The method of  claim 1 , wherein the signal is transmitted according to IEEE 802.11.  
   
   
       4 . The method of  claim 1 , wherein the signal is encoded according to H.263.  
   
   
       5 . The method of  claim 1 , wherein the signal is encoded according to MPEG-4.  
   
   
       6 . The method of  claim 1 , wherein the method further comprises retransmitting a data packet upon request.  
   
   
       7 . The method of  claim 1 , wherein the method further comprises adding a second plurality of repair packets based on the second level of protection.  
   
   
       8 . A system for adding error resiliency to a signal, the system comprising: 
 a QoS controller for estimating a level of signal protection required, wherein a first plurality data packets in the signal is associated with a first level of protection and a second plurality data packets in the signal is associated with a second level of protection;    a channel adaption packetizer for adding proactive repair redundancy information to the first data packet;    a packet-level error control coder for adding a first plurality of repair packets based on the first level of protection; and    a transmitter for transmitting the signal.    
   
   
       9 . The system of  claim 8 , wherein the signal is transmitted according to IEEE 802.11.  
   
   
       10 . The system of  claim 8 , wherein the system comprises an H.263 encoder.  
   
   
       11 . The system of  claim 8 , wherein the system comprises an MPEG-4 encoder.