GB2377865A - Early despatch of packet header to overcome transmission latency when sending video or audio over the internet - Google Patents

Early despatch of packet header to overcome transmission latency when sending video or audio over the internet Download PDF

Info

Publication number
GB2377865A
GB2377865A GB0108804A GB0108804A GB2377865A GB 2377865 A GB2377865 A GB 2377865A GB 0108804 A GB0108804 A GB 0108804A GB 0108804 A GB0108804 A GB 0108804A GB 2377865 A GB2377865 A GB 2377865A
Authority
GB
United Kingdom
Prior art keywords
internet
packet
packet header
header
despatch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB0108804A
Other versions
GB0108804D0 (en
GB2377865B (en
Inventor
Bob Tang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB0108804A priority Critical patent/GB2377865B/en
Publication of GB0108804D0 publication Critical patent/GB0108804D0/en
Publication of GB2377865A publication Critical patent/GB2377865A/en
Application granted granted Critical
Publication of GB2377865B publication Critical patent/GB2377865B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478—Provisions for broadband connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/54—Store-and-forward switching systems 
    • H04L12/56—Packet switching systems
    • H04L12/5601—Transfer mode dependent, e.g. ATM
    • H04L2012/5638—Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671—Support of voice
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22—Parsing or analysis of headers

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

To eliminate transmission latency due to the header of an IP packet, ATM cell or Ethernet frame, the header of the packet or frame is transmitted a set time before the data to be transmitted in the body of the packet or cell is due to be available for transmission, the set time corresponding precisely to the header transmission time. The packet data may comprise PCM voice information, or video data.

Description

<Desc/Clms Page number 1>
ELIMINATING LATENCY INTRODUCED BY IP PACKET/ATM CELL/ETHERNET FRAME (etc..) HEADER IN TRANSMITTING PERIODIC DATA OVER THE INTERNET PCM Audio data ! Movies Frames/Process Control signal samples are time periodic hence very predictable. Transmitting the above periodic data samples over the Internet requires the data be sent as eg IP Packets/ATM Cellls/Ethernet frames etc.
At present the periodic sampled data is thus encapsulated, at the time the sample becomes available for transmission, eg as IPv4 Packet where the Ipv4 Header will take up 20 bytes with the sample data filling the data portion, before the completed Ipv4 packet is sent eg via 64Kbs modem line by the PC. The 20 bytes (ie 160 bits) IP header takes 2.5 milliseconds to exit the modem along the 64Kbs line, thus introduces 2.5 milliseconds delay to the start of transmission of the actual sample data along the 64K line.
To eliminate the above example 2.5 milliseconds latency introduced by the Ipv4 Packet Header overhead, the method here presends the Ipv4 packet header from the PC to the modem exactly 2 5 milliseconds ahead before the periodic sample PCM audio data becomes available for the PC to start sending the periodic sample PCM audio sample (as Ipv4 Packet data portion, with or without computed checksum as required) to the modem for immediate transmission along the 64Kbs line. The sample PCM audio data portion will then be sent by the PC immediately following the Ipv4 Packet Header exiting the modem along the 64Kbs line.
<Desc/Clms Page number 2>
For example, a single Voice telephony, the 4 KHz analog signals at say 1/100 second intervals are first converted to 640 bits/sec digital signals using PCM sampling at twice the analog frequency, & the PCM sample is then compressed as required to fit the 64Kbs transmission line bandwidths (taking into consideration also the 160 bits IPv4 Packet Header overhead required to transmit each 640 bits sample PCM audio data above). Here the IP Packet Header is pre-sent, by the PC's accordingly modified Protocol Stacks/Modem Driver softwares, to the modem for immediate transmission along the 64Kbs line exactly 2.5 milliseconds before the PC sends the compressed sample PCM data to the modem for immediate transmission along the 64KBS line, at every 1/100 second periodic intervals The above-described embodiments merely illustrate the principles of the invention.
Those skilled in the art may make various modifications and changes that will embody the principles of the invention and fall within the spirit and scope thereof

Claims (1)

  1. CLAIMS 1 A Method for transmitting periodic data over the Internet, said Method here presends the IP packet/ATM Cell/Ethernet Frame (etc..) header ahead in time before the periodic data portion first becomes available to be transmitted, immediately following the IP packet/ATM Cell/Ethernet Frame (etc..) header along the transmission line.
GB0108804A 2001-04-07 2001-04-07 Eliminating latency introduced by IP packet/ATM cell/Ethernet frame (etc..) header in transmitting periodic data over the internet Expired - Fee Related GB2377865B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0108804A GB2377865B (en) 2001-04-07 2001-04-07 Eliminating latency introduced by IP packet/ATM cell/Ethernet frame (etc..) header in transmitting periodic data over the internet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0108804A GB2377865B (en) 2001-04-07 2001-04-07 Eliminating latency introduced by IP packet/ATM cell/Ethernet frame (etc..) header in transmitting periodic data over the internet

Publications (3)

Publication Number Publication Date
GB0108804D0 GB0108804D0 (en) 2001-05-30
GB2377865A true GB2377865A (en) 2003-01-22
GB2377865B GB2377865B (en) 2004-04-28

Family

ID=9912479

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0108804A Expired - Fee Related GB2377865B (en) 2001-04-07 2001-04-07 Eliminating latency introduced by IP packet/ATM cell/Ethernet frame (etc..) header in transmitting periodic data over the internet

Country Status (1)

Country Link
GB (1) GB2377865B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004056064A1 (en) * 2002-12-17 2004-07-01 Bob Tang Early despatch of packet header to overcome transmission latency when sending video or audio over the internet

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0596645A1 (en) * 1992-11-02 1994-05-11 National Semiconductor Corporation Frame-based transmission of data
US5581551A (en) * 1993-12-21 1996-12-03 Siemens Aktiengesellschaft Method for transmitting digital signals in an ATM communication network
JPH11284629A (en) * 1998-03-31 1999-10-15 Nippon Telegr & Teleph Corp <Ntt> Radio packet transmission device
WO2000045555A1 (en) * 1999-01-28 2000-08-03 Data Race, Inc. Escape sequence protocol for multiplexing real-time data with non-real-time data
WO2000059166A1 (en) * 1999-03-31 2000-10-05 Softfront, Inc. System to transmit voice data over a packet network

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0596645A1 (en) * 1992-11-02 1994-05-11 National Semiconductor Corporation Frame-based transmission of data
US5581551A (en) * 1993-12-21 1996-12-03 Siemens Aktiengesellschaft Method for transmitting digital signals in an ATM communication network
JPH11284629A (en) * 1998-03-31 1999-10-15 Nippon Telegr & Teleph Corp <Ntt> Radio packet transmission device
WO2000045555A1 (en) * 1999-01-28 2000-08-03 Data Race, Inc. Escape sequence protocol for multiplexing real-time data with non-real-time data
WO2000059166A1 (en) * 1999-03-31 2000-10-05 Softfront, Inc. System to transmit voice data over a packet network

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004056064A1 (en) * 2002-12-17 2004-07-01 Bob Tang Early despatch of packet header to overcome transmission latency when sending video or audio over the internet

Also Published As

Publication number Publication date
GB0108804D0 (en) 2001-05-30
GB2377865B (en) 2004-04-28

Similar Documents

Publication Publication Date Title
US5526353A (en) System and method for communication of audio data over a packet-based network
US5923655A (en) Interactive video communication over a packet data network
US7124202B2 (en) System and method for aggregating channel segment ID&#39;s into a first section and data segments into a second section
WO2000045581A3 (en) Modem transfer mechanism which prioritized data transfers
CA2249152A1 (en) Apparatus for and method of managing bandwidth for a packet-based connection
WO2005043178A3 (en) Optimizing packetization for minimal end-to-end delay in voip networks
CA2260978A1 (en) Processing device network
AU2894999A (en) Apparatus and method for predictive time stamping of isochronous data packets
EP1495612B1 (en) Method and apparatus for efficient transmission of voip traffic
AU2029997A (en) Speech transmission in a packet network
WO1999054801A3 (en) Method and apparatus of supporting an audio protocol in a network
US4663755A (en) Transmission system
US7058568B1 (en) Voice quality improvement for voip connections on low loss network
EP1197054B1 (en) Internet protocol stack for real-time applications
US7995590B2 (en) Method and system for communicating H.263 macroblock boundaries using H.221 BAS for RFC2190-compliant fragmentation
US7295547B2 (en) Audio gateway device
WO2003056779A1 (en) Improved hardware arrangement, terminal, and method for transferring audio signal in packet-switched communications network
GB2377865A (en) Early despatch of packet header to overcome transmission latency when sending video or audio over the internet
EP1748590A1 (en) Wideband-narrowband telecommunication
WO2004056064A1 (en) Early despatch of packet header to overcome transmission latency when sending video or audio over the internet
Hoshi et al. Proposal of a method of voice stream multiplexing for IP telephony systems
Cisco Link Efficiency Mechanisms Overview
CN105337897A (en) Audio PTT synchronous transmission system based on RTP message
EP1201072B1 (en) Test method for computer telephony links
Daniel et al. Federal standard 2.4 kbps MELP over IP

Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20100407