Enhanced stream layer transmission for mediaFLO mobile multimedia multicast system
View Patent ↗Enhancing stream layer transmission for a MediaFLO mobile multimedia multicast system comprising a transmitter and a receiver includes sending a plurality of multicast logical channels (MLC) forming a data frame from the transmitter, wherein each MLC comprises multimedia data streams comprising a stream 0, 1 , and 2 data packet, and parity data bits; switching, by the transmitter, an order of the multimedia data streams of the MLC transmitted by the transmitter; sending a signal to the receiver from the transmitter to specify a mode of transmission of the MLC, wherein the mode of transmission comprises an order of transmitting the data packets of the MLC; inserting, by the transmitter, a flag in control information transmitted in the stream 0 data packets; decoding, by the receiver, the flag to determine the mode of transmission; and performing, by the receiver, a CRC of the stream 0 data packet.
1. A method of enhancing stream layer transmission for a mobile multimedia multicast system comprising a transmitter and a receiver, said method comprising:
sending a plurality of multicast logical channels (MLCs) forming a data frame from said transmitter, wherein each MLC comprises multimedia data streams comprising a stream 0 data packet, a stream 1 data packet, a stream 2 data packet, and parity data bits, and wherein four data frames comprises a super-frame;
switching, by said transmitter, an order of said multimedia data streams of said MLC transmitted by said transmitter;
sending a signal to said receiver from said transmitter to specify a mode of transmission of said MLC, wherein said mode of transmission comprises an order of transmitting the data packets of said MLC;
inserting, by said transmitter, a flag in control information transmitted in said stream 0 data packets in said MLC;
receiving, at said receiver, said flag;
decoding, by said receiver, said flag to determine said mode of transmission; and
performing, by said receiver, a cyclic redundancy check (CRC) of said stream 0 data packet.
2. The method of claim 1 , wherein the switching of said order of said multimedia data streams of said MLC comprises swapping said stream 2 data packet with said stream 0 data packet.
3. The method of claim 2 , wherein said mode of transmission comprises a first mode comprising an original sequence of multimedia data streams, and a second mode comprising the swapped sequence of multimedia data streams.
4. The method of claim 1 , further comprising decrypting all of a first and second frame of said super-frame in said receiver prior to receiving a third frame of said super-frame in said receiver.
5. The method of claim 1 , further comprising personalizing said mode of transmission for individual receivers.
6. The method of claim 1 , wherein at said receiver, when said control information is received within a super-frame for each said MLC, said flag indicates said mode of transmission of a certain channel for a specific receiver.
7. The method of claim 3 , further comprising performing error detection on said multimedia data streams.
8. The method of claim 7 , further comprising correcting errors in said multimedia data streams using redundant data stored on a fourth frame of said super-frame.
9. The method of claim 8 , further comprising:
detecting an error in said multimedia data streams;
switching said mode of transmission to said first mode from said second mode; and
correcting said error using said redundant data stored on said fourth frame of said super-frame.
10. The method of claim 1 , wherein in the decoding process, if an order of said mode of transmission has said stream 0 data packet presented first, then said receiver decoding said stream 0 data packet, and upon successful reception of said stream 0 data packet in said receiver, then said receiver extracting a code word (CW) from said super-frame and performing decryption of said super-frame while receiving data frames.
11. The method of claim 1 , wherein in the decoding process, if said stream 0 data packet is incorrectly decoded based on a result of said CRC check, then said receiver waiting until an end of a transmission of said super-frame to perform a Reed Solomon (RS) decoding process on all content of said super-frame.
12. The method of claim 1 , wherein in the decoding process, if an order of said mode of transmission has said stream 0 data packet presented last, then said receiver waiting until an entire super-frame is received prior to performing decryption of said super-frame.
13. A system for enhancing stream layer transmission for a mobile multimedia multicast environment, said system comprising:
a transmitter that sends a plurality of multicast logical channels (MLCs) forming a data frame, wherein each MLC comprises multimedia data streams comprising a stream 0 data packet, a stream 1 data packet, a stream 2 data packet, and parity data bits, and wherein four data frames comprises a super-frame;
a switching mechanism in said transmitter that switches an order of said multimedia data streams of said MLC transmitted by said transmitter;
a transmission mechanism in said transmitter that sends a signal to a receiver to specify a mode of transmission of said MLC, wherein said mode of transmission comprises an order of transmitting the data packets of said MLC;
a flag inserted by said transmitter in control information transmitted in said stream 0 data packets in said MLC, wherein said receiver receives said flag to determine said mode of transmission; and
cyclic redundancy check (CRC) hardware on said receiver to perform a CRC of said stream 0 data packet.
14. The system of claim 13 , wherein the switching of said order of said multimedia data streams of said MLC comprises swapping said stream 2 data packet with said stream 0 data packet.
15. The system of claim 14 , wherein said mode of transmission comprises a first mode comprising an original sequence of multimedia data streams, and a second mode comprising the swapped sequence of multimedia data streams.
16. The system of claim 13 , wherein said receiver comprises a component that decrypts all of a first and second frame of said super-frame in said receiver prior to receiving a third frame of said super-frame in said receiver.
17. The system of claim 13 , wherein said mode of transmission is personalized for individual receivers.
18. The system of claim 13 , wherein at said receiver, when said control information is received within a super-frame for each said MLC, said flag indicates said mode of transmission of a certain channel for a specific receiver.
19. The system of claim 15 , further comprising an error detection component in said receiver that performs error detection on said multimedia data streams.
20. The system of claim 19 , further comprising an error corrector component in said receiver that corrects errors in said multimedia data streams using redundant data stored on a fourth frame of said super-frame.
21. The system of claim 13 , wherein if an order of said mode of transmission has said stream 0 data packet presented first, then said receiver decodes said stream 0 data packet, and upon successful reception of said stream 0 data packet in said receiver, then said receiver extracts a code word (CW) from said super-frame and performing decryption of said super-frame while receiving data frames.
22. The system of claim 13 , wherein if said stream 0 data packet is incorrectly decoded based on a result of said CRC check, then said receiver waits until an end of a transmission of said super-frame to perform a Reed Solomon (RS) decoding process on all content of said super-frame.
23. The system of claim 13 , wherein if an order of said mode of transmission has said stream 0 data packet presented last, then said receiver waits until an entire super-frame is received prior to performing decryption of said super-frame.