Based on the correlation structure of real - time variable bit rate video traffic , this paper proposed a dynamic bandwidth allocation ( dba ) algorithm with adaptive linear traffic prediction in ethernet passive optical network ( epon ) 摘要根據(jù)視頻數(shù)據(jù)流的長程相關(guān)性特點,提出一種以太無源光網(wǎng)絡(luò)中面向?qū)崟r可變比特率視頻的動態(tài)帶寬分配算法。
In the next part of this thesis , the existing bandwidth allocation algorithms are discussed in detail at first , including static bandwidth allocation algorithm and dynamic bandwidth allocation algorithm 接下來重點分析目前已有的帶寬分配算法,包括固定帶寬分配算法和動態(tài)帶寬分配算法,在此基礎(chǔ)上提出了一種高效的保證qos的固定周期的動態(tài)帶寬分配算法。
To effectively and fairly allocate bandwidths between end users and ensure quality of service ( qos ) requirement , we propose a new fixed cycle polling dynamic bandwidth allocation algorithm 在設(shè)計動態(tài)帶寬分配算法的時候,考慮到網(wǎng)絡(luò)流量的特性,并滿足提高系統(tǒng)的帶寬利用率、保證公平性和qos ( qualityofservice )要求的目的,本文提出了一種固定輪詢周期的保證qos的動態(tài)帶寬分配算法。
Then a new fixed cycle polling dynamic bandwidth allocation algorithm is proposed to support qos and improve bandwidth utilization in epon . the proposed algorithm consists of two parts : one is scheduling between olt and onus , and the other is scheduling between priority queues in onu 此算法將帶寬分配過程分為兩部分,首先是onu之間的調(diào)度,即olt給每個onu分配帶寬;其次是onu內(nèi)部的調(diào)度,即onu將帶寬分配給各個優(yōu)先級隊列。
In this thesis , firstly dynamic bandwidth allocation algorithm tgogt where the two groups of onu are granted in turn and allocation bandwidth according to the characteristic of network traffic and their delay request for different service is brought forward in tgogt , all onus in the system are departed into two groups , and the queue - threshold was set for every group 本文首先從提高系統(tǒng)的帶寬利用率的角度出發(fā),充分利用網(wǎng)絡(luò)流量的自相似特性,提出了一種能有效地提高系統(tǒng)上行帶寬利用率的動態(tài)帶寬分配算法tgogt 。 tgogt算法采取把onu分成兩組,為每組onu設(shè)定“閥值帶寬” ,兩組onu輪流請求授權(quán),隨著網(wǎng)絡(luò)負(fù)載情況的變化, olt改變對onu中各個隊列的授權(quán)方式。
Because the most valuable advantage of gpon is that it can transmit services which require different qos guarantees at the same time , the dynamic bandwidth allocation and utilization algorithm which can be easily realized and provide different qos support will be the key to success of gpon 由于能夠高質(zhì)量、高效率的傳輸不同qos要求業(yè)務(wù)這一特點是gpon較其它無源光接入網(wǎng)技術(shù)最大的優(yōu)點,所以研究出一套即簡單實用又能夠滿足業(yè)務(wù)qos要求的高效上行動態(tài)帶寬分配和利用算法將是gpon成功的關(guān)鍵。
In twt photonic burst network , the bandwidth granularity is a single timeslot rather than a whole wavelength , so the bandwidth can be used more efficiently ; what is more , the dynamic bandwidth allocation is based on the reservation information of every edge node , so it can meet the challenge of burtsy ip traffic 在twt光突發(fā)網(wǎng)絡(luò)中,帶寬分配的粒度被減小至單個時隙,而不是整個波長,因此能夠使得帶寬的利用更充分有效;另外,帶寬的分配是依據(jù)各邊緣節(jié)點的帶寬預(yù)約信息而動態(tài)進(jìn)行的,因此能夠適應(yīng)ip數(shù)據(jù)流量具有的高突發(fā)性。
The alternative solutions to upstream include wdma , tdma , cdma , and csma / cd , among which we adopt tdma at present . in this paper , existing dynamic bandwidth allocation ( dba ) scheme is introduced and a novel dba algorithm over qos is presented , which has fixed cycle , based on the self - similarity character of network traffic 可選方案有波分復(fù)用( wdma ) 、時分復(fù)用( tdma ) 、碼分復(fù)用( cdma )和隨機(jī)接入( csma / cd ) ,綜合考慮各方面,目前采用的可行方案是時分復(fù)用方式。
Dynamic bandwidth allocation is a technique by which traffic bandwidth in a shared telecommunications medium can be allocated on demand and fairly between different users of that bandwidth. This is a form of bandwidth management, and is essentially the same thing as statistical multiplexing.