Method and apparatus for transmission framing in a wireless communication system

• US 9,100,457 B2
• Filed: 08/20/2001
• Issued: 08/04/2015
• Est. Priority Date: 03/28/2001
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Hsu, Raymond T.
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): DUONG, DUC T
• Application Number:
  US09/933,639
• Publication Number:
  US 20020141371A1
• Time in Patent Office: 5,097 Days
• Field of Search: 370/328, 370/338, 370/389, 370/392, 370/400, 370/401, 370/466, 370/469, 370/474, 370/505, 709/236
• US Class Current: 1/1
• CPC Class Codes: G06F 21/606 by securing the transmission between two devices or processes
• CPC Class Codes: G06F 21/64 Protecting data integrity, e.g. using checksums, certificates or signatures
• CPC Class Codes: G06F 2221/2107 File encryption
• CPC Class Codes: H03M 13/09 Error detection only, e.g. using cyclic redundancy check [CRC] codes or single parity bit
• CPC Class Codes: H04L 1/0083 Formatting with frames or packets; Protocol or part of protocol for error control
• CPC Class Codes: H04L 12/1877 Measures taken prior to transmission
• CPC Class Codes: H04L 12/189 in combination with wireless systems selective distribution or broadcast in wireless communication networks H04W4/06
• CPC Class Codes: H04L 2209/80 Wireless network architectures or network communication protocols for wireless network security H04W12/00
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management data processing systems or methods, specially adapted for commerce, e.g. marketing, shopping, billing, auctions or e-commerce G06Q30/00
• CPC Class Codes: H04L 63/0442 wherein the sending and receiving network entities apply asymmetric encryption, i.e. different keys for encryption and decryption cryptographic mechanisms or cryptographic arrangements for public-key encryption H04L9/30
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 63/068 using time-dependent keys, e.g. periodically changing keys cryptographic mechanisms or cryptographic arrangements for controlling usage of secret information H04L9/088
• CPC Class Codes: H04L 63/164 at the network layer
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/611 for multicast or broadcast systems for broadcast or conference H04L12/18; arrangements for broadcast or distribution combined with broadcast H04H20/00; arrangements for broadcast applications with a direct linkage to broadcast information or to broadcast space-time H04H60/00; selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS], H04W4/06
• CPC Class Codes: H04L 65/65 Network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP]
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/161 Implementation details of TCP/IP or UDP/IP stack architecture; Specification of modified or new header fields
• CPC Class Codes: H04L 69/164 Adaptation or special uses of UDP protocol
• CPC Class Codes: H04L 69/324 : in the data link layer [OSI layer 2], e.g. HDLC
• CPC Class Codes: H04L 9/40 : Network security protocols
• CPC Class Codes: H04W 28/04 : Error control
• CPC Class Codes: H04W 28/06 : Optimizing the usage of the radio link, e.g. header compression, information sizing , discarding information system modifying transmission characteristic according to link quality by modifying frame length H04L1/0007; dynamic adaptation of the packet size for flow control or congestion control H04L47/365
• CPC Class Codes: H04W 28/18 : Negotiating wireless communication parameters
• CPC Class Codes: H04W 4/00 : Services specially adapted for wireless communication networks; Facilities therefor
• CPC Class Codes: H04W 52/0216 : using a pre-established activity schedule, e.g. traffic indication frame
• CPC Class Codes: H04W 80/00 : Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: Y02D 30/70 : in wireless communication networks

Abstract

Method and apparatus for framing in a wireless transmission system supporting broadcast transmissions. A framing format incorporates fields specific to a uni-directional transmission and reduces the overhead of the system. One embodiment employs a version of HDLC having a start of frame field and an error checking mechanism attached to the payload of each frame, wherein protocol information is not transmitted with each individual frame.

Claims

1. A method for framing packets in a wireless transmission system supporting broadcast transmissions, the method comprising:

generating a portion of an Internet Protocol (IP) packet for transmission;

appending a start of frame indicator to the portion of the IP packet;

applying an error checking mechanism to the portion of the IP packet not including a protocol field to identify a payload type;

preparing a frame for transmission, having the start of frame indicator, the portion of the IP packet, and the error checking mechanism; and

transmitting the frame without the protocol field.

2. The method as in claim 1, wherein the start of frame indicator is a predetermined sequence of bits, the method further comprising:

if the portion of the IP packet contains the predetermined sequence of bits, inserting a classifier into the portion of the IP packet.

3. The method as in claim 2, wherein the classifier corresponds to an escape character.

4. The method as in claim 1, wherein the error checking mechanism is a frame check sequence.

5. A method for receiving framed packets in a wireless transmission system supporting broadcast transmissions, the method comprising:

receiving a frame of a packet transmission wherein the frame contains a payload portion of an Internet Protocol (IP) packet and does not include a protocol field to identify a payload type, the frame having a start of frame portion, a payload portion, and an error check portion, the frame not including the protocol field;

identifying the frame as a start frame in the packet transmission;

verifying the frame using the error check portion of the frame; and

processing the payload portion of the frame.

6. The method as in claim 5, wherein if the start of frame indicator is a predetermined sequence of bits, and wherein if the payload portion contains the predetermined sequence of bits, the payload portion further includes a classifier to identify the predetermined sequence of bits in the payload.

7. The method as in claim 6, wherein the classifier defines an escape character.

8. The method as in claim 6, further comprising:

identifying the classifier in the payload not including protocol information to identify a payload type; and

processing the payload without the classifier.

9. The method as in claim 5, wherein the error check portion is a frame check sequence.

10. An apparatus for framing packets in a wireless transmission system supporting broadcast transmissions, the apparatus comprising:

means for generating a portion of an Internet Protocol (IP) packet for transmission;

means for appending a start of frame indicator to the portion of the IP packet;

means for applying an error checking mechanism to the portion of the IP packet;

means for preparing a frame for transmission, having the start of frame indicator, the portion of the IP packet and the error checking mechanism and not including a protocol field to identify a payload type; and

means for transmitting the frame without the protocol field.

11. An apparatus for receiving framed packets in a wireless transmission system supporting broadcast transmissions, the apparatus comprising:

means for receiving a frame of a packet transmission wherein the frame contains a payload portion of an Internet Protocol (IP) packet and does not include a protocol field to identify a payload type, the frame having a start of frame portion, a payload portion, and an error check portion, the frame not including the protocol field;

means for identifying the frame as a start frame in the packet transmission;

means for verifying the frame using the error check portion of the frame; and

means for processing the payload portion of the frame.

12. A non-transitory storage medium encoded with executable instructions for framing packets in a wireless transmission system supporting broadcast transmissions, the instructions comprising:

a first set of instructions for generating a portion of an Internet Protocol (IP) packet for transmission;

a second set of instructions for appending a start of frame indicator to the portion of the IP packet;

a third set of instructions for applying an error checking mechanism to the portion of the IP packet;

a fourth set of instructions for preparing a frame for transmission, having the start of frame indicator, the portion of the IP packet and the error checking mechanism and not including a protocol field to identify a payload type; and

a fifth set of instructions for transmitting the frame without the protocol field.

13. A non-transitory storage medium encoded with executable instructions for receiving framed packets in a wireless transmission system supporting broadcast transmissions, the instructions comprising:

a first set of instructions for receiving a frame of a packet transmission wherein the frame contains a payload portion of an Internet Protocol (IP) packet and does not include a protocol field to identify a payload type;

the frame having a start of frame portion, a payload portion, and an error check portion, the frame not including the protocol field;

a second set of instructions for identifying the frame as a start frame in the packet transmission;

a third set of instructions for verifying the frame using the error check portion of the frame; and

a fourth set of instructions for processing the payload portion of the frame.

14. An apparatus comprising:

a memory; and

a processor for executing a set of instructions stored in the memory, the set of instructions for;

generating a portion of an Internet Protocol (IP) packet for transmission;

appending a start of frame indicator to the portion of the IP packet;

applying an error checking mechanism to the portion of the IP packet not including a protocol field to identify a payload type;

preparing a frame for transmission, having the start of frame indicator, the portion of the IP packet, and the error checking mechanism; and

transmitting the frame without the protocol field.

15. The apparatus of claim 14, wherein the start of frame indicator is a predetermined sequence of bits and wherein the processor is futher for executing instructions for:

if the portion of the IP packet contains the predetermined sequence of bits, inserting a classifier into the portion of the IP packet.

16. The apparatus of claim 15, wherein the classifier corresponds to an escape character.

17. The apparatus of claim 14, wherein the error checking mechanism is a frame check sequence.

18. An apparatus for receiving framed packets in a wireless transmission system supporting broadcast transmissions, the apparatus comprising:

a memory; and

a processor for executing a set of instructions stored in the memory, the set of instructions for;

receiving a frame of a packet transmission wherein the frame contains a payload portion of an Internet Protocol (IP) packet and does not include a protocol field to identify a payload type, the frame having a start of frame portion, a payload portion, and an error check portion, the frame not including the protocol field;

identifying the frame as a start frame in the packet transmission;

verifying the frame using the error check portion of the frame; and

processing the payload portion of the frame.

19. The apparatus of claim 18, wherein if the start of frame indicator is a predetermined sequence of bits, and wherein if the payload portion contains the predetermined sequence of bits, the payload portion further includes a classifier to identify the predetermined sequence of bits in the payload.

20. The apparatus of claim 19, wherein the classifier defines an escape character.

21. The apparatus of claim 19, wherein the processor is further for executing instructions for:

identifying the classifier in the payload not including protocol information to identify a payload type; and

processing the payload without the classifier.

22. The apparatus of claim 18, wherein the error check portion is a frame check sequence.