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Staggercasting method and apparatus using type of service (TOS) information

A technology of service type and identification information, which is applied in the field of digital transmission and can solve problems such as no other paths are available

Inactive Publication Date: 2011-05-18
THOMSON LICENSING SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, if the number of network devices is minimal, doing so will not necessarily have an impact on service, for example, using the TOS bit will not impact any service that has only one router in its network, since no other path is available

Method used

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  • Staggercasting method and apparatus using type of service (TOS) information
  • Staggercasting method and apparatus using type of service (TOS) information
  • Staggercasting method and apparatus using type of service (TOS) information

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Experimental program
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Embodiment Construction

[0017] figure 1 is a block diagram of an illustrative arrangement comprising an interleaved transmitter 110 , a multiplexer (MUX) 120 , a network 150 with other transmit / receive network elements, and a receiver 151 . A source 101 , such as a video encoder, provides a stream of raw packets to an interleaver 110 , which in turn provides an intercast transmission to a MUX 120 . The output of MUX 120 is coupled to a broadband limited transmission channel carried by network 150 to receiver 151 .

[0018] During normal operation, a staggercast transmission from transmitter 110 to MUX 120 includes two streams. One stream, the primary stream, corresponds to the original stream from source 101 and the other stream, the secondary stream, is a redundant copy of the primary stream. Note that for the purposes of the present invention, the headers of primary flow packets may differ from the headers of corresponding primary flow packets, and the headers of secondary flow packets may diffe...

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PUM

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Abstract

A stagger transmitter manipulates the Type of Service (TOS) information contained in packets transmitted therefrom. Downstream network devices, such as a network Multiplexer (MUX), use the TOS information to handle the packets. A MUX controls the bandwidth allocated to each of the original and staggered streams in accordance with the TOS information. The stagger transmitter manipulates the TOS information of packets in accordance with other information contained in the packets, such as Network Abstraction Layer (NAL) information. As such, the staggered stream copies of more important packets, as indicated by their NAL information, can have their TOS information set by the stagger transmitter so that a network MUX will forward such staggered packets in addition to the original packets, thereby providing redundancy and error protection for such packets.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 132,315, filed June 17, 2008. technical field [0003] The present invention relates to the field of digital transmission, and more particularly to staggercasting of streams of packetized data. Background technique [0004] Many transmission systems such as mobile radio broadcasting systems suffer from difficult physical channels. In addition to fading and Doppler effects, signals can be completely blocked by buildings, trees, poles and spanning bridges, and other obstacles. This can easily result in a loss of signal for a second or more. Staggercasting provides a way to prevent signal loss by sending another redundant stream that is time-shifted by one second relative to the main stream. This enables the receiver to pre-buffer packets of the secondary stream to replace packets of the primary stream that were lost in transmission. [0005] Techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N21/236H04N21/6437H04N5/00H04N7/24
CPCH04N21/4385H04N21/2389H04N21/2365H04N21/6437H04N21/2381H04N21/64322H04N21/435H04N21/4347H04N21/26275H04N21/235H04N21/2402
Inventor 阿维纳什·斯瑞德哈大卫·安东尼·卡姆帕娜夏米蒙·曼娜里路迪·安德路
Owner THOMSON LICENSING SA
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