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題名 | 下世代PON網路的同步機制=Synchronization Mechanism in the Next-Generation PON Network |
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作者 | 徐誌宏; 巫瑞庭; | 書刊名 | 電腦與通訊 |
卷期 | 135 2010.10[民99.10] |
頁次 | 頁18-24 |
專輯 | 多重服務網路接取技術專題 |
分類號 | 448.6 |
關鍵詞 | 家用基地臺; 準確時間協定; Gigabit被動光纖網路; Femtocell base station; Precision time protocol; PTP; Gigabit passive optical network; GPON; |
語文 | 中文(Chinese) |
中文摘要 | 為了避免無線基地台間訊號收送時的互相干擾,基地台間必須精確的同步。傳統上基地台之間乃使用分時多工(Time-Division Multiplexing; TDM)網路中的同步機制或者使用全球定位系統(Global Position System; GPS)訊號,然而TDM網路價格較高,佈建GPS則會受到地形的限制,目前可行的方法為使用IEEE 1588準確時間協定(Precision Time Protocol; PTP)。PTP可透過Ethernet和IP網路傳遞,並可達到sub-microsecond等級的精確度,因此被視為是一經濟且有效的時脈同步方式。近年來FTTx的技術快速進展,其中被動光纖網路(Passive Optical Network; PON)具有能夠提供用戶高速資料傳輸以及價格低廉的優點,被視為是提供寬頻接取的最佳技術之一,目前Gigabit等級的PON有IEEE 802.3ah EPON(Ethernet Passive Optical Network)以及ITU G.984 GPON(Gigabit Passive Optical Network)兩種技術,目前兩種技術已經成熟並開始大量被網路業者佈建。本文描述了如何於PON網路上傳遞同步時脈訊號以提供基地台,特別是家用基地台(Femtocell Base Station)的同步訊號,以滿足各基地台間的同步要求。 |
英文摘要 | In order to avoid the interference between base-stations, the synchronization between base-stations is very important. Conventionally, the base-stations are interconnected by TDM network, such as SONET/SDH, or are equipped with GPS (Global Position System). Both mechanisms can provide precise synchronization. However, the cost of TDM network deployment is much higher and the GPS synchronization accuracy will be affected by terrain variations. Recently, IEEE 1588 Precision Time Protocol (PTP) has been discussed in many literatures, because PTP can be easily embedded with network equipments to allow the TDM traffic to pass through the Ethernet and IP networks with sub-microsecond level of timing synchronization accuracy. Therefore, it is an economic and efficient way to provide clock synchronization over IP networks.Recently, FTTx networks grow rapidly, and many countries have invested a lot of money to deploy the FTTx infrastructure. Passive Optical Network (PON) is considered to be the main solution due to its using low cost and passive optical components in optical distribution networks (ODN) and easy maintenance. Currently, PON can be classified into two types: IEEE 802.3ah EPON (Ethernet Passive Optical Network) and ITU G.984 GPON (Gigabit Passive Optical Network). Both technologies are matured and many operators adopted them to provide broadband services and also the backhauling of wireless and mobile networks. This article describes how PTP synchronization clock signal pass through the PON networks to provide the precise clock to the base stations, especially the Femtocell Base station. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。