Method and apparatus for transmission framing in a wireless communication system

• US 20020141371A1
• Filed: 08/20/2001
• Published: 10/03/2002
• Est. Priority Date: 03/28/2001
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Hsu, Raymond T.
• Granted Patent: US 9,100,457 B2
• Time in Patent Office: Days
• US Class Current: 370/338
• 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;

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 protocol information.

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.

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

5. A communication signal transmitted via a carrier wave, comprising:

a payload portion corresponding to at least a portion of an Internet Protocol (IP) packet of digital information;

a start of frame portion corresponding to the payload portion, and identifying a status of the payload portion within an IP packet;

and an error checking portion for verifying the payload portion.

6. The method as in claim 5, wherein the start of frame portion is a predetermined sequence of bits, and

wherein if the payload portion contains the predetermined sequence of bits, the payload portion further comprises:

a classifier portion.

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

receiving a frame of a packet transmission, the frame having a start of frame portion, a payload portion, and an error check portion, the frame not including protocol information;

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.

8. The method as in claim 7, 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.

9. The method as in claim 8, wherein the classifier defines an escape character.

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

identifying the classifier in the payload; and

processing the payload without the classifier.

12. 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

means for transmitting the frame without protocol information.

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

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.

14. A computer program stored on a computer-readable storage unit, the computer program for framing packets in a wireless transmission system supporting broadcast transmissions, the computer program 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

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

15. An computer program stored on a computer-readable storage unit, the computer program for receiving framed packets in a wireless transmission system supporting broadcast transmissions, the computer program comprising:

a first set of instructions for receiving a frame of a packet transmission, the frame having a start of frame portion, a payload portion, and an error check portion, the frame not including protocol information;

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.