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

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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
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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
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Individual
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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

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04QSELECTING
    • H04Q11/00Selecting arrangements for multiplex systems
    • H04Q11/04Selecting arrangements for multiplex systems for time-division multiplexing
    • H04Q11/0428Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
    • H04Q11/0478Provisions for broadband connections
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5638Services, e.g. multimedia, GOS, QOS
    • H04L2012/5646Cell characteristics, e.g. loss, delay, jitter, sequence integrity
    • H04L2012/5652Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/54Store-and-forward switching systems 
    • H04L12/56Packet switching systems
    • H04L12/5601Transfer mode dependent, e.g. ATM
    • H04L2012/5638Services, e.g. multimedia, GOS, QOS
    • H04L2012/5671Support of voice
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/22Parsing 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

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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