Granted Patent B2

US 7,782,903 · App. 12/120,487 · Granted Aug 24, 2010

Abstract

Claims (68)

1. An apparatus that performs protocol stack layer processing for a mobile multimedia multicast system comprising a transmitter comprising a host processor and a host memory component, said apparatus comprising:

a receiver that receives a wireless data stream comprising a mobile multimedia multicast system superframe comprising any of audio, video, and text media frames arranged in multiplexed Multicast Logical Channels (MLCs) and received from said transmitter, wherein each MLC is divided into 16 byte data packets, and wherein each MLC carries up to three logical sub-channels comprising stream 2 , stream 1 , and stream 0 ; and

an Application Specific Integrated Circuit (ASIC) memory component operatively connected to said receiver, wherein said ASIC memory component performs processing of said data packets using hardware components comprising:

a Medium Access Control (MAC) layer core that processes said data packets by deinterleaving said data packets, performing Reed-Solomon (RS) decoding of the deinterleaved data packets, and removing parity bits from the decoded data packets;

a stream layer core that extracts said stream 0 from said MLC, sends said stream 0 to said host processor, and receives a decryption key from said host processor;

a decryption layer core that decrypts the processed data packets;

a defragmentation layer core that removes a fragmentation header located at a beginning of each fragment of said data packets, processes Cyclic Redundancy Checks (CRCs) on said data packets, and constructs a service layer packet; and

a sync layer core that parses a sync header from said media frames, and identifies the type of said media frames being transmitted,

wherein said type of said media frames being transmitted comprises any of a random access point (RAP) frame and a non-RAP frame,

wherein said processing is performed in place in said ASIC memory component, wherein said in place indicates that only one byte is removed and three bytes are added in said defragmentation layer core, and

wherein said decryption layer core decrypts said processed data packets using decryption keys using an Advance Encryption Standard (AES) 128 bits counter mode descrambler.

2. The apparatus of claim 1 , wherein upon completion of the parsing process performed by said sync layer core, said receiver informs said host processor for reading data components of said wireless data stream from said ASIC memory component.

3. The apparatus of claim 2 , wherein said host processor provides said data components to a codec to decode and play any of audio, video, and text media content.

4. The apparatus of claim 1 , wherein when there is any of a channel switching event and an error event, said sync layer retains a RAP version of a particular frame to be written in said ASIC memory component and overwrites memory containing a non-RAP version of said particular frame.

5. The apparatus of claim 1 , wherein said sync layer overwrites memory containing a RAP version of a particular frame to be written in said ASIC memory component, and retains a non-RAP version of said particular frame.

6. The apparatus of claim 1 , wherein said defragmentation layer core determines a length of each service packet from a respective fragmentation header, and places three empty bytes in place of the removed bytes in a service packet header.

7. The apparatus of claim 6 , wherein said defragmentation layer core:

saves a memory address of said placed three empty bytes in said ASIC memory component separately;

processes fragments of a current data packet until a last fragment is processed;

computes a length of the processed service packet;

re-enters the three empty bytes in the memory address of said service packet header from its saved address;

configures fragment headers bit containing the last fragment information; and

places service packet length information in said service packet header.

8. A method of performing protocol stack layer processing for a mobile multimedia multicast system comprising a transmitter comprising a host processor and a host memory component, said method comprising:

receiving, in a receiver, a wireless data stream comprising a mobile multimedia multicast system superframe comprising any of audio, video, and text media frames arranged in multiplexed Multicast Logical Channels (MLCs) and received from said transmitter, wherein each MLC is divided into 16 byte data packets, and wherein each MLC carries up to three logical sub-channels comprising stream 2 , stream 1 , and stream 0 ; and

processing said data packets in an Application Specific Integrated Circuit (ASIC) memory component operatively connected to said receiver, wherein said ASIC memory component comprises:

a Medium Access Control (MAC) layer core that processes said data packets by deinterleaving said data packets, performing Reed-Solomon (RS) decoding of the deinterleaved data packets, and removing parity bits from the decoded data packets;

a stream layer core that extracts said stream 0 from said MLC, sends said stream 0 to said host processor, and receives a decryption key from said host processor;

a decryption layer core that decrypts the processed data packets;

a defragmentation layer core that removes a fragmentation header located at a beginning of each fragment of said data packets, processes Cyclic Redundancy Checks (CRCs) on said data packets, and constructs a service layer packet; and

a sync layer core that parses a sync header from said media frames, and identifies the type of said media frames being transmitted,

wherein said type of said media frames being transmitted comprises any of a random access point (RAP) frame and a non-RAP frame,

wherein said processing is performed in place in said ASIC memory component, wherein said in place indicates that only one byte is removed and three bytes are added in said defragmentation layer core, and

wherein said decryption layer core decrypts said processed data packets using decryption keys using an Advance Encryption Standard (AES) 128 bits counter mode descrambler.

9. The method of claim 8 , wherein upon completion of the parsing process performed by said sync layer core, said receiver informs said host processor for reading data components of said wireless data stream from said ASIC memory component.

10. The method of claim 9 , wherein said host processor provides said data components to a codec to decode and play any of audio, video, and text media content.

11. The method of claim 8 , wherein when there is any of a channel switching event and an error event, said sync layer retains a RAP version of a particular frame to be written in said ASIC memory component and overwrites memory containing a non-RAP version of said particular frame.

12. The method of claim 8 , wherein said sync layer overwrites memory containing a RAP version of a particular frame to be written in said ASIC memory component, and retains a non-RAP version of said particular frame.

13. The method of claim 8 , wherein said defragmentation layer core determines a length of each service packet from a respective fragmentation header, and places three empty bytes in place of the removed bytes in a service packet header.

14. The method of claim 13 , wherein said defragmentation layer core:

saves a memory address of the placed three empty bytes in said ASIC memory component separately;

processes fragments of a current data packet until a last fragment is processed;

computes a length of the processed service packet;

re-enters the three empty bytes in the memory address of said service packet header from its saved address;

configures fragment headers bit containing the last fragment information; and

places service packet length information in said service packet header.

15. An apparatus that performs protocol stack layer processing for a mobile multimedia multicast system, said apparatus comprising:

a receiver that receives a wireless data stream comprising a mobile multimedia multicast system superframe comprising any of audio, video, and text media frames arranged in multiplexed Multicast Logical Channels (MLCs), wherein each MLC is divided into 16 byte data packets, and wherein each MLC carries up to three logical sub-channels comprising stream 2 , stream 1 , and stream 0 ; and

an Application Specific Integrated Circuit (ASIC) memory component operatively connected to said receiver, wherein said ASIC memory component performs processing of said data packets using hardware components comprising:

a Medium Access Control (MAC) layer core that processes said data packets by deinterleaving said data packets, performing Reed-Solomon (RS) decoding of the deinterleaved data packets, and removing parity bits from the decoded data packets;

a stream layer core that extracts said stream 0 from said MLC, sends said stream 0 to a processing device, and receives a decryption key from said processing device;

a decryption layer core that decrypts the processed data packets;

a defragmentation layer core that removes a fragmentation header located at a beginning of each fragment of said data packets, processes Cyclic Redundancy Checks (CRCs) on said data packets, and constructs a service layer packet; and

a sync layer core that parses a sync header from said media frames, and identifies the type of said media frames being transmitted,

wherein said type of said media frames being transmitted comprises any of a random access point (RAP) frame and a non-RAP frame,

wherein said processing is performed in place in said ASIC memory component, wherein said in place indicates that only one byte is removed and three bytes are added in said defragmentation layer core, and

wherein said decryption layer core decrypts said processed data packets using decryption keys using an Advance Encryption Standard (AES) 128 bits counter mode descrambler.

16. The apparatus of claim 15 , wherein upon completion of the parsing process performed by said sync layer core, said receiver informs said processing device for reading data components of said wireless data stream from said ASIC memory component.

17. The apparatus of claim 16 , wherein said processing device provides said data components to a codec to decode and play any of audio, video, and text media content.

18. The apparatus of claim 15 , wherein when there is any of a channel switching event and an error event, said sync layer retains a RAP version of a particular frame to be written in said ASIC memory component and overwrites memory containing a non-RAP version of said particular frame.

19. The apparatus of claim 15 , wherein said sync layer overwrites memory containing a RAP version of a particular frame to be written in said ASIC memory component, and retains a non-RAP version of said particular frame.

20. The apparatus of claim 15 , wherein said defragmentation layer core determines a length of each service packet from a respective fragmentation header, and places three empty bytes in place of the removed bytes in a service packet header, and wherein said defragmentation layer core:

saves a memory address of said placed three empty bytes in said ASIC memory component separately;

processes fragments of a current data packet until a last fragment is processed;

computes a length of the processed service packet;

re-enters the three empty bytes in the memory address of said service packet header from its saved address;

configures fragment headers bit containing the last fragment information; and

places service packet length information in said service packet header.

Assignments (31)