JP2017513331A - 拡張された伝送制御機能性を実施するトランスポートアクセラレータ - Google Patents

拡張された伝送制御機能性を実施するトランスポートアクセラレータ Download PDF

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JP2017513331A
JP2017513331A JP2016557252A JP2016557252A JP2017513331A JP 2017513331 A JP2017513331 A JP 2017513331A JP 2016557252 A JP2016557252 A JP 2016557252A JP 2016557252 A JP2016557252 A JP 2016557252A JP 2017513331 A JP2017513331 A JP 2017513331A
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イニアン・マオ
ファティ・ウルピナール
マイケル・ジョージ・ルビー
ロレンツ・クリストフ・ミンダー
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クアルコム，インコーポレイテッド
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    • 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
    • H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
    • H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
    • H04L69/321—Interlayer communication protocols or service data unit [SDU] definitions; Interfaces between layers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/61—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio
    • H04L65/612—Network streaming of media packets for supporting one-way streaming services, e.g. Internet radio for unicast
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L47/00—Traffic control in data switching networks
    • H04L47/10—Flow control; Congestion control
    • H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/60—Network streaming of media packets
    • H04L65/75—Media network packet handling
    • H04L65/764—Media network packet handling at the destination 
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/80—Responding to QoS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • 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
    • H04L69/40—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection
    • 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
    • H04L69/16—Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
    • H04L69/163—In-band adaptation of TCP data exchange; In-band control procedures

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Multimedia (AREA)
  • Computer Security & Cryptography (AREA)
  • Information Transfer Between Computers (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)
  • Mobile Radio Communication Systems (AREA)
JP2016557252A 2014-03-18 2015-03-16 拡張された伝送制御機能性を実施するトランスポートアクセラレータ Ceased JP2017513331A (ja)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US201461954936P 2014-03-18 2014-03-18
US61/954,936 2014-03-18
US14/289,016 2014-05-28
US14/289,016 US9794311B2 (en) 2014-03-18 2014-05-28 Transport accelerator implementing extended transmission control functionality
PCT/US2015/020814 WO2015142758A1 (en) 2014-03-18 2015-03-16 Transport accelerator implementing extended transmission control functionality

Publications (1)

Publication Number Publication Date
JP2017513331A true JP2017513331A (ja) 2017-05-25

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JP2016557252A Ceased JP2017513331A (ja) 2014-03-18 2015-03-16 拡張された伝送制御機能性を実施するトランスポートアクセラレータ
JP2016557223A Pending JP2017516336A (ja) 2014-03-18 2015-03-16 拡張された伝送制御機能性を実施するトランスポートアクセラレータ

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JP2016557223A Pending JP2017516336A (ja) 2014-03-18 2015-03-16 拡張された伝送制御機能性を実施するトランスポートアクセラレータ

Country Status (6)

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US (2) US20150271225A1 (enExample)
EP (2) EP3120522A1 (enExample)
JP (2) JP2017513331A (enExample)
KR (2) KR20160133454A (enExample)
CN (2) CN106105141A (enExample)
WO (2) WO2015142748A1 (enExample)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10469579B2 (en) * 2010-12-16 2019-11-05 General Electric Company Method and system for data processing in a vehicle group
US20150271225A1 (en) 2014-03-18 2015-09-24 Qualcomm Incorporated Transport accelerator implementing extended transmission control functionality
US20150373075A1 (en) * 2014-06-23 2015-12-24 Radia Perlman Multiple network transport sessions to provide context adaptive video streaming
US9426418B2 (en) * 2014-07-29 2016-08-23 Qualcomm Incorporated Reducing delay in video telephony
CN106982108B (zh) 2016-01-18 2019-05-28 华为技术有限公司 一种数据传输的方法以及相关设备
US10785116B1 (en) * 2017-01-12 2020-09-22 Electronic Arts Inc. Computer architecture for asset management and delivery
US10091118B2 (en) * 2017-01-27 2018-10-02 Verizon Patent And Licensing Inc. Maximizing throughput over a TCP link by boosting packet transmission
US10878028B1 (en) * 2017-11-22 2020-12-29 Amazon Technologies, Inc. Replicating and indexing fragments of time-associated data streams
US10764347B1 (en) 2017-11-22 2020-09-01 Amazon Technologies, Inc. Framework for time-associated data stream storage, processing, and replication
US10944804B1 (en) 2017-11-22 2021-03-09 Amazon Technologies, Inc. Fragmentation of time-associated data streams
US11025691B1 (en) 2017-11-22 2021-06-01 Amazon Technologies, Inc. Consuming fragments of time-associated data streams
CN110876210B (zh) * 2018-08-31 2021-06-25 展讯通信（上海）有限公司 Ue非连续接收的控制方法及装置、存储介质、终端
US12001355B1 (en) 2019-05-24 2024-06-04 Pure Storage, Inc. Chunked memory efficient storage data transfers
US11234159B2 (en) 2019-10-04 2022-01-25 Verizon Patent And Licensing Inc. Systems and methods for congestion control on mobile edge networks
US11140060B2 (en) * 2019-11-12 2021-10-05 Hulu, LLC Dynamic variation of media segment durations for optimization of network round trip times
CN111181963B (zh) * 2019-12-30 2022-11-01 华数传媒网络有限公司 基于端口转发超文本传输协议的认证鉴权方法
US11329922B2 (en) * 2019-12-31 2022-05-10 Opanga Networks, Inc. System and method for real-time mobile networks monitoring
US11303954B1 (en) 2021-01-04 2022-04-12 Sony Corporation Long duration error correction with fast channel change for ATSC 3.0 real-time broadcast mobile application
US11451853B1 (en) 2021-08-06 2022-09-20 Sony Group Corporation Measuring ATSC 3 RF environment using autonomous vehicle
US20240073025A1 (en) * 2022-08-26 2024-02-29 Raytheon BBN Technologies, Corp. Resource Adaptive Communication Protocols
CN116166715B (zh) * 2023-02-07 2025-05-23 上海沄熹科技有限公司 时序数据存储引擎的乱序处理方法及系统
CN120264389B (zh) * 2025-05-30 2025-08-29 浙江慧仓智能科技有限公司 智能设备调试方法、电子设备、智能设备调试系统及介质

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009057375A1 (ja) * 2007-10-29 2009-05-07 Nec Corporation 通信システム、データ送信装置、データ受信装置、通信方法および通信用プログラム
WO2010111261A1 (en) * 2009-03-23 2010-09-30 Azuki Systems, Inc. Method and system for efficient streaming video dynamic rate adaptation
JP2013505685A (ja) * 2009-09-22 2013-02-14 クゥアルコム・インコーポレイテッド 協力的並行ｈｔｔｐ及び前方誤り訂正を用いた拡張ブロック−要求ストリーミング
WO2013130477A1 (en) * 2012-02-27 2013-09-06 Qualcomm Incorporated Improved dash client and receiver with buffer water-level decision-making
WO2014033140A1 (en) * 2012-08-30 2014-03-06 Thomson Licensing Rendering time control

Family Cites Families (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6990069B1 (en) 1997-02-24 2006-01-24 At&T Corp. System and method for improving transport protocol performance in communication networks having lossy links
EP1313318A1 (en) 2000-08-25 2003-05-21 Matsushita Electric Industrial Co., Ltd. Data transmission method and data relay method
US6807578B2 (en) 2001-03-14 2004-10-19 International Business Machines Corporation Nack suppression for multicast protocols in mostly one-way networks
US7908472B2 (en) * 2001-07-06 2011-03-15 Juniper Networks, Inc. Secure sockets layer cut through architecture
US7228412B2 (en) * 2001-07-06 2007-06-05 Juniper Networks, Inc. Bufferless secure sockets layer architecture
US7853781B2 (en) * 2001-07-06 2010-12-14 Juniper Networks, Inc. Load balancing secure sockets layer accelerator
US7149892B2 (en) * 2001-07-06 2006-12-12 Juniper Networks, Inc. Secure sockets layer proxy architecture
US7502860B1 (en) 2001-07-09 2009-03-10 Cisco Technology, Inc. Method and apparatus for client-side flow control in a transport protocol
US7120666B2 (en) 2002-10-30 2006-10-10 Riverbed Technology, Inc. Transaction accelerator for client-server communication systems
US20040210663A1 (en) 2003-04-15 2004-10-21 Paul Phillips Object-aware transport-layer network processing engine
US8238241B2 (en) * 2003-07-29 2012-08-07 Citrix Systems, Inc. Automatic detection and window virtualization for flow control
EP1671424B1 (en) 2003-10-08 2012-06-06 Digital Fountain, Inc. Fec-based reliability control protocols
WO2005039075A1 (ja) * 2003-10-15 2005-04-28 Mitsubishi Denki Kabushiki Kaisha 路車間通信システム
CN101133623B (zh) * 2004-12-30 2011-11-16 茨特里克斯系统公司 用于提供客户端加速技术的系统和方法
US20060253605A1 (en) 2004-12-30 2006-11-09 Prabakar Sundarrajan Systems and methods for providing integrated client-side acceleration techniques to access remote applications
US7502383B2 (en) * 2005-02-01 2009-03-10 Intel Corporation Apparatus and method of controlling transmission of response frame
ITTO20050221A1 (it) * 2005-04-04 2006-10-05 St Microelectronics Srl Procedimento e sistema per la correzione degli errori a raffica nelle reti di comunicazione, rete e prodotto informatico relativi
US7515565B2 (en) * 2005-05-09 2009-04-07 Kyocera Corporation Multiple source wireless communication system and method
US8676882B2 (en) 2007-02-27 2014-03-18 Sony Corporation System and method for preloading content segments to client devices in an electronic network
US7532134B2 (en) * 2007-03-12 2009-05-12 Citrix Systems, Inc. Systems and methods for sharing compression histories between multiple devices
JP4525780B2 (ja) 2008-03-24 2010-08-18 ソニー株式会社 受信装置、送信装置、通信システム、および中継サーバのバッファ設定検出方法
US8295159B2 (en) * 2009-01-14 2012-10-23 Qualcomm Incorporated Timer poll retransmission expiry in a wireless communication system
WO2010108144A1 (en) 2009-03-19 2010-09-23 Georgia Tech Research Corporation Systems and methods for improved wireless interface aggregation
WO2010127365A1 (en) * 2009-05-01 2010-11-04 Citrix Systems, Inc. Systems and methods for establishing a cloud bridge between virtual storage resources
US20120327779A1 (en) * 2009-06-12 2012-12-27 Cygnus Broadband, Inc. Systems and methods for congestion detection for use in prioritizing and scheduling packets in a communication network
JP2011015273A (ja) * 2009-07-03 2011-01-20 Kddi Corp コンテンツ配信システム
US9015564B2 (en) 2009-08-19 2015-04-21 Qualcomm Incorporated Content delivery system with allocation of source data and repair data among HTTP servers
CN101719809B (zh) 2009-11-25 2012-10-10 中兴通讯股份有限公司 一种媒体数据包丢包恢复的方法及系统
EP2362651A1 (en) 2010-02-19 2011-08-31 Thomson Licensing Multipath delivery for adaptive streaming
GB201004449D0 (en) * 2010-02-22 2010-05-05 Corbett Sean Data accelerator
CN102986189B (zh) * 2010-05-09 2016-04-27 思杰系统有限公司 用于为对应于虚通道的网络连接分配服务等级的系统和方法
US8396126B2 (en) 2010-06-18 2013-03-12 Cisco Technology, Inc. Systems and methods for video coding and transmission
US8549617B2 (en) * 2010-06-30 2013-10-01 Juniper Networks, Inc. Multi-service VPN network client for mobile device having integrated acceleration
CN102143137A (zh) 2010-09-10 2011-08-03 华为技术有限公司 媒体流发送及接收方法、装置和系统
US8433783B2 (en) * 2010-09-29 2013-04-30 Citrix Systems, Inc. Systems and methods for providing quality of service via a flow controlled tunnel
US8707448B2 (en) * 2010-11-09 2014-04-22 International Business Machines Corporation Secure distribution of media data
US8543623B2 (en) * 2010-11-09 2013-09-24 International Business Machines Corporation Secure distribution of media data
US20120136878A1 (en) * 2010-11-26 2012-05-31 Raymond Cypher Applying hierarchy information to data items
US8750188B2 (en) 2010-12-01 2014-06-10 Deutsche Telekom Ag System support for accessing and switching among multiple wireless interfaces on mobile devices
US8873385B2 (en) 2010-12-07 2014-10-28 Microsoft Corporation Incast congestion control in a network
US11025962B2 (en) 2011-02-28 2021-06-01 Adobe Inc. System and method for low-latency content streaming
US9203892B2 (en) * 2011-04-19 2015-12-01 Accenture Global Services Limited Content transfer accelerator
US9130864B2 (en) * 2011-06-27 2015-09-08 Citrix Systems, Inc. Prioritizing classes of network traffic to provide a predetermined quality of service
KR20130005873A (ko) 2011-07-07 2013-01-16 삼성전자주식회사 방송 시스템에서 컨텐츠 수신 방법 및 장치
US9253233B2 (en) 2011-08-31 2016-02-02 Qualcomm Incorporated Switch signaling methods providing improved switching between representations for adaptive HTTP streaming
EP2566172A1 (en) 2011-09-02 2013-03-06 Thomson Licensing Method and apparatus for adaptive transcoding of multimedia stream
US20130080932A1 (en) 2011-09-27 2013-03-28 Sanjiv Sirpal Secondary single screen mode activation through user interface toggle
US8897753B2 (en) 2011-10-12 2014-11-25 Motorola Mobility Llc Method for retrieving content by a wireless communication device having first and second radio access interfaces, wireless communication device and communication system
CN104067594A (zh) 2011-11-01 2014-09-24 高通股份有限公司 在http服务器之间分配源数据和修复数据的内容传送系统
EP2615790A1 (en) 2012-01-12 2013-07-17 Alcatel Lucent Method, system and devices for improved adaptive streaming of media content
US9401968B2 (en) 2012-01-20 2016-07-26 Nokia Techologies Oy Method and apparatus for enabling pre-fetching of media
US9374406B2 (en) 2012-02-27 2016-06-21 Qualcomm Incorporated Dash client and receiver with a download rate estimator
US20130227102A1 (en) 2012-02-29 2013-08-29 Alcatel-Lucent Usa Inc Chunk Request Scheduler for HTTP Adaptive Streaming
US9009260B2 (en) 2012-05-10 2015-04-14 Blackberry Limited Method, system and apparatus for transferring data via more than one communications interface
US10009445B2 (en) 2012-06-14 2018-06-26 Qualcomm Incorporated Avoiding unwanted TCP retransmissions using optimistic window adjustments
US9118744B2 (en) 2012-07-29 2015-08-25 Qualcomm Incorporated Replacing lost media data for network streaming
KR102164457B1 (ko) 2013-04-25 2020-10-14 삼성전자주식회사 다중 무선 억세스를 위한 전자 장치 및 그 방법
US10432482B2 (en) * 2013-07-16 2019-10-01 Fastly, Inc. Network parameter configuration based on end user device characteristics
US9124673B2 (en) * 2013-09-30 2015-09-01 Intel IP Corporation Transmission control protocol (TCP) based video streaming
US20150271225A1 (en) 2014-03-18 2015-09-24 Qualcomm Incorporated Transport accelerator implementing extended transmission control functionality
US9350484B2 (en) * 2014-03-18 2016-05-24 Qualcomm Incorporated Transport accelerator implementing selective utilization of redundant encoded content data functionality

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009057375A1 (ja) * 2007-10-29 2009-05-07 Nec Corporation 通信システム、データ送信装置、データ受信装置、通信方法および通信用プログラム
WO2010111261A1 (en) * 2009-03-23 2010-09-30 Azuki Systems, Inc. Method and system for efficient streaming video dynamic rate adaptation
JP2013505685A (ja) * 2009-09-22 2013-02-14 クゥアルコム・インコーポレイテッド 協力的並行ｈｔｔｐ及び前方誤り訂正を用いた拡張ブロック−要求ストリーミング
WO2013130477A1 (en) * 2012-02-27 2013-09-06 Qualcomm Incorporated Improved dash client and receiver with buffer water-level decision-making
WO2014033140A1 (en) * 2012-08-30 2014-03-06 Thomson Licensing Rendering time control

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
里田 浩三 他: "複数ＴＣＰコネクションを利用した音声通信方式の音質評価", 電子情報通信学会技術研究報告, vol. 113, no. 293, JPN6018006132, 2013, JP, pages 7 - 12, ISSN: 0003744629 *

Also Published As

Publication number Publication date
CN106416179A (zh) 2017-02-15
EP3108639B1 (en) 2018-04-18
US20150271225A1 (en) 2015-09-24
WO2015142758A1 (en) 2015-09-24
EP3108639A1 (en) 2016-12-28
EP3120522A1 (en) 2017-01-25
KR20160133454A (ko) 2016-11-22
CN106105141A (zh) 2016-11-09
US9794311B2 (en) 2017-10-17
KR20160135200A (ko) 2016-11-25
US20150271224A1 (en) 2015-09-24
JP2017516336A (ja) 2017-06-15
WO2015142748A1 (en) 2015-09-24

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