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Data repair enhancements for multicast/broadcast data distribution

A data repair and data technology, applied in the field of multicast and broadcast transmission technology and services

Active Publication Date: 2007-05-02
NOKIA TECHNOLOGLES OY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sender can also be configured to schedule and perform a point-to-point repair session if the point-to-multipoint retransmission does not correct the data loss issue

Method used

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  • Data repair enhancements for multicast/broadcast data distribution
  • Data repair enhancements for multicast/broadcast data distribution
  • Data repair enhancements for multicast/broadcast data distribution

Examples

Experimental program
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Embodiment Construction

[0024] There are various methods and systems for repairing data in multicast or broadcast systems. Various methods for repairing data are described in US Patent Application entitled "Data Restoration" (Serial No. 10 / 782,371), filed February 18, 2004, the contents of which are hereby incorporated by reference in their entirety. This application proposes that after receiving a certain number of NACK requests from the receiver, the sender can decide based on its own decision strategy to retransmit some of the packets that are negatively acknowledged by the receiver via point-to-multipoint, e.g. Those packets most requested by receivers are retransmitted. The sender can also close the point-to-point connection to save network resources.

[0025] One drawback to approaches such as this is that retransmitting only the most negatively-acknowledged packets may not result in full error recovery, given little statistical correlation between NACK requests of different users. For exampl...

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PUM

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Abstract

A method, system, device, and computer code product is disclosed in which a sender (10) transmits data to a plurality of receivers (20) via a point-to-multipoint session. The receiver sends data repair requests to the sender (10) requesting data expected but not received and the sender (10) retransmits the expected but not received data via the point-­to-multipoint session. The sender (10) can also schedule point-to-point data repair sessions with individual receivers if the retransmission via the point-to-multipoint session does not correct all errors. The sender (10) can be configured to delay point-to-­point repair sessions using a randomization mechanism based on the number of receivers using the point-to-multipoint session.

Description

technical field [0001] The present invention generally relates to multicast and broadcast transmission techniques and services, ie services having at least one data source (or sender) and at least one receiver. More specifically, the present invention relates to data repair enhancements in multicast or broadcast transmissions. Background technique [0002] For one-to-many (i.e. point-to-multipoint) services over systems such as IP Multicast, IP Datacasting (IPDC) and Multimedia Broadcast / Multicast Service (MBMS), file delivery (or discrete media delivery or file download) is an important service. Many features for delivering files over point-to-point protocols such as File Transfer Protocol (FTP) and Hypertext Transfer Protocol (HTTP) are problematic for one-to-many situations. In particular, reliable file delivery—that is, guaranteed file delivery—using a similar one-to-one (ie, point-to-point) acknowledgment (ACK) protocol such as Transmission Control Protocol TCP is not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/18G06F11/30G08C25/02H04L1/00H04L1/16H04L12/18H04L12/28H04L12/56H04L29/08
CPCH04L12/1868H04L2001/0093H04L29/08072H04L45/28H04L45/16H04L1/1887H04L69/329H04L1/18H04L1/16G06F11/30
Inventor 戴维·利昂伊戈尔·达尼洛·迭戈·屈尔西奥罗德·瓦尔施阿尔施·梅塔
Owner NOKIA TECHNOLOGLES OY
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