Call signalling protocols and media stream packetization for packet based multimedia communications systems 基于包的多媒體通信系統(tǒng)上的呼叫信令協(xié)議及媒體流打包技術(shù)
With internet growing more and more fast and getting widely used , packetization based on ip has become the main trend of the evolution of telecommunication networks , and voip technology is being developed very rapidly 互聯(lián)網(wǎng)速度越來越快,覆蓋范圍越來越廣,以ip為核心的分組化已成為電信網(wǎng)絡(luò)演進的主流方向, voip技術(shù)正在經(jīng)歷前所未有的迅速發(fā)展。
Then it puts forward an end - to - end transport architecture based on rtp for mpeg - 4 video streaming over the internet and studies the playload type and packetization algorithm of mpeg - 4 video bit - streams to achieve both efficiency and robustness for internet mpeg - 4 video 然后提出了基于rtp的mpeg - 4視頻傳輸模型,研究適合于mpeg - 4視頻傳輸?shù)膔tp載荷格式及組包算法,使傳輸同時具有高效性和丟包的魯棒性。
The main contributions of the thesis are : ( 1 ) we present an end - to - end transport architecture using the rtp / udp / ip protocol stack and employ an efficient and robust packetization algorithm for mpeg - 4 video bit - streams at the sync layer for internet transport . ( 2 ) we study the congestion control mechanism based on aimd algorithm , and make improvement in order to reduce the oscillation of transimition rate due to tremendous contrast of packet loss ratio caused by dynamical change of the network load 論文的主要貢獻在于:提出了基于rtp的mpeg - 4視頻傳輸模型并充分利用mpeg - 4的videoobjectplane ( vop )特性,采用適用于mpeg - 4視頻傳輸?shù)膔w載荷格式及組包算法,同時具有傳輸?shù)母咝院蛠G包的魯棒性。
This article take the contract management module in this system as an example , well described the system design and the process of development . the contract management module take the contract as a core , realized the function which people can add , change and delete information of the personnel , the device , the packetization , the material , the contract information that related to contracts , and users can inquire about related content according to respective permission 本文以該系統(tǒng)中的合同管理模塊為例,詳細描述了系統(tǒng)的設(shè)計和開發(fā)過程。合同管理模塊以合同為中心,實現(xiàn)了與合同相關(guān)的人員、設(shè)備、分包、材料、合同概況等信息的添加、修改和刪除功能,并可以根據(jù)各自的權(quán)限,查詢相關(guān)的內(nèi)容。
Its low memory requirement and flexible algorithms in complexity are particularly suited for real - time implementation . the third technique is odd and even packetization suited for real - time implement in internet . if odd and even packetization technique cooperate with error concealment and error tracking , the video will achieve good vision quality 此外,如果將一幀數(shù)據(jù)的奇序號gob和偶序號gob分別放入不同的數(shù)據(jù)包(奇包與偶包)在基于ip的網(wǎng)絡(luò)上傳輸,即使發(fā)生丟包的情況,重建數(shù)據(jù)也能獲得較好的視覺效果。
Ip voice gateway is a node between the communication control unit and the server of trunking system in trunking system network . its duty is digital compress coding and packetization of the voice in trunking system . it located on the edge of the network and accessed the trunking system into ip network from the kernel network angle 語音網(wǎng)關(guān)作為集群通信系統(tǒng)ip聯(lián)網(wǎng)的關(guān)鍵設(shè)備,它處于集群系統(tǒng)話路控制單元和集群系統(tǒng)服務(wù)器之間,起著語音壓縮、分組傳輸?shù)闹匾饔?從網(wǎng)絡(luò)的角度來看,它處于ip網(wǎng)絡(luò)和集群無線通信系統(tǒng)之間,把集群通信系統(tǒng)接入ip網(wǎng)絡(luò)。