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Error control on-demand

A data packet, sending unit technology used in error prevention, error prevention/detection using return channels, digital transmission systems, etc.

Inactive Publication Date: 2014-12-24
ALCATEL LUCENT SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] FEC is also disadvantageous because it requires a lot of data overhead to achieve acceptable QoE, preventing the corresponding channel bandwidth from being used by other services

Method used

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  • Error control on-demand
  • Error control on-demand
  • Error control on-demand

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0050] From figure 1 It can be seen that the communication system 1 includes:

[0051] sending unit 100; and

[0052] Receiving unit 200.

[0053] The sending unit 100 and the receiving unit 200 are coupled to each other via a packet-switched communication network, which may include other intermediate network nodes (not shown), and which supports a data path 310 through which data packets travel from the sending unit 100 to to the receiving unit 200), and the error control path 320 (error control messages are exchanged between the sending unit 100 and the receiving unit 200 via the error control path 320).

[0054] The sending unit 100 and the receiving unit 200 respectively send and receive streams Dj-5, Dj-4, Dj-3, Dj-2, Dj-1, Dj, . . . , Dk-1, Dk, Dk of indexed data packets +1, Dk+2, . . . , where j represents the index of the specific data packet lost, and k represents the index of the data packet being scheduled for transmission by the sending unit 100, where j

[...

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PUM

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Abstract

The present invention relates to a new error control paradigm in a packet switched network that is particularly advantageous for multicast transmission. A transmission Status vector TSV (T) is updated at the sender side whenever a new outgoing data packet (Dj-1) is scheduled for transmission. A corresponding Reception Status Vector RSV (R) is similarly updated at the receive side whenever a new incoming and correctly indexed data packet (Dj-1) is validly received. As soon as a missing or corrupted data packet (Dj) is detected, the update of the RSV is suspended. A request is then sent to the sender to get the current TSV's value, or a part thereof. The erroneous data packet is then recovered from the current TSV'S value (sk,m), from the lastly updated RSV'S value (sj-1), and from otherwise validly received data packets (Dj+1, ..., Dk). The present invention more specifically relates to a transmitting unit (100) and a receiving unit (200) implementing that paradigm, and correspondingly to a method for protecting a flow of indexed data packets against data lost or data corruption, and a method for recovering a missing or corrupted data packet within a flow of indexed data packets.

Description

technical field [0001] The present invention relates to a new paradigm of error control in packet switched networks. Background technique [0002] Packet-switched networks are inherently unreliable, meaning they will not guarantee that they will not delay, corrupt or lose packets, or deliver packets out of order. [0003] Forward error correction (FEC) and retransmission are fundamental error control paradigms that provide reliable communication over packet-switched networks. [0004] A retransmission is the resending of corrupted or lost data packets and relies on: [0005] - a checksum (or similar), used to check the integrity of the received message; [0006] - an acknowledgment, that is, an unambiguous receipt from the receiver to the sender via some return channel; and [0007] - Retransmission of lost or corrupted packets (initiated by sender or receiver). [0008] Retransmission implies that a copy of each pending packet (ie not yet acknowledged) is kept at the se...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00H04L1/12
CPCH04L1/0057H04L1/12
Inventor K·莱文斯D·德弗莱斯朔韦尔N·德格朗德
Owner ALCATEL LUCENT SAS