ADHOC网络学习报告

CO
远程节点
OLT
OLT ONU-2
OLT
光纤
Internet
无线网状网络
无源光网络
Fig.4 Basic architecture of FiWi access network
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Contents
1 Introduction 2 Main research hot points 3 Simulation based on OPNET
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2.Main research hot points
• Survivability
Network protection mechanism can be divided into link protection and path protection, in addition, there is a segment protection between these two kinds of protection mechanism. According to the arrange of fault influence, there are three types of network fault : OLT class, ONU class and wireless router class.
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2.Main research hot points
骨干网
业务t1的工作无线连接 业务t1的备用无线连接 业务t2的工作无线连接 业务t2的备用无线连接
骨干网
业务t2的数据包
（a）
单位无线链路容量RCr
{t1 , t2 }
业务t1的数据包
业务t2的数据包
业务t1的数据包
（b）
Fig.9 Segment Protection algorithm with Local Connection Availability, SPLCA (Sharing scheme for the allocation of working wireless link capacity)
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2.Main research hot points
后端PON被占用带宽容量
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SPLCA, A∈[0.90,0.99]
SPLCA, A∈[0.85,0.99]
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LBSP, A∈[0.90,0.99]
LBSP, A∈[0.85,0.99]
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40
38
36
34
3
4
5
6
7
ONU数目
160
SPLCA, A∈[0.90,0.99]
WAN (Wireless access network)
BBluluee ttoootohth Zziiggbbeeee
Wwifiifi
Wwiimmaxax
3G、4G
Fig.3 Types of wireless access network
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1.Introduction
无线网关 无线路由器
ONU-1
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2.Main research hot points
• Deployment • Routing algorithm • Energy saving mechanism • Survivability
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2.Main research hot points
• Routing algorithm
They were all evolved from AODV （Ad hoc On-Dem and Distance Vector Routing ）and DSR（Dynamic Source Routing） （Minimum Hop Routing Algorithm，MHRA） （Shortest Path Routing Algorithms，SPRA） （Predictive Throughput Routing Algorithm，PTRA） （Delay-Aware Routing Algorithm，DARA） （Capacity and Delay Aware Routing，CaDAR） （Risk -and -Delay Aware Routing，RADAR）
n(oeptwticoarkl )
oPpOticNal(npeatswsiovrek)
opAtiOcaNl n(aectwtivoerk)
TDM-PON
WDM-PON
TDM/WDM-PON
AAPOONN
EEPPOONN
GGPOONN Fig.1 Types of optical access network
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SPLCA, A∈[0.85,0.99]
LBSP, A∈[0.90,0.99]
120
LBSP, A∈[0.85,0.99]
100
80
60
40
20
10
20
30
40
50
业务数目
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Fig.11 Comparison of occupied bandwidth capacity in the back-end PON between SPLCA and LBSP algorithms with different ONU number
LR-PON (Ring-and-spur topology) Wireless mesh network
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3.Simulation base on OPNET
A MANET (mobile ad-hoc network) project in OPNET
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Reference
• [1] 李冰.可生存FiWi接入网中连接可用性保护算法设计与仿真实现 [D] .东 北大学，2014.
用户 用户
Fig.7 Illustration of full protection approach
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2.Main research hot points
ONU 1 分支光纤
中心局 （CO ）
主干光纤
光分路器 OLT
故障
…… …
备用无线路径
ONU N
工作无线路径
Fig.8 Illustration of PON protection approach based on wireless rerouting
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2.Main research hot points
中心局 CO
PON接口(工作) PON接口(备用)
OLT
分支光纤 distribution fiber
主干光纤 feeder fiber
ONU 1
PON接口(工作) PON接口(备用)
…
光分路器 1:N splitter
ONU N
PON接口(工作) PON接口(备用)
Fig.12 Comparison of occupied bandwidth capacity in the front-end WMN between SPLCA and LBSP algorithms with different traffic number
前端WMN被占用带宽容量
Contents
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2.Main research hot points
业务t的工作连接 业务t的备用连接
骨干网
业务a的工作连接 业务a的备用连接
ONU-8
ONU-7
ONU-6
ONU-5
…
ONU-4
ONU-1
ONU-3 ONU-2
单位无线链路容量 RCr
{a,t}
业务a 业务t
Fig.10 Path Protection algorithm with Global Connection Availability, PPGCA (Sharing scheme for the allocation of working wireless link capacity in path protection)
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2.Main research hot points来自ONU级别故障影响区域
无线路由器级别 故障影响区域
无线路由器
故障 无线链路
...
ONU-1
CO
故障
远程节点
OLT 故障
OLT
主干光纤 OLT
分支光纤
ONU-2
OLT级别故障影响区域
Fig.5 Domians affected by different levels of failures in FiWi access network
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Thanks for your attention!
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1.Introduction
骨干网
光线路终端 (OLT)
分支光纤 (distribution fiber)
主干光纤
.
(feeder fiber)
.
.
光分路器(splitter)
用户终端
光网络单元(ONU)
Fig.2 Illustration of the PON architecture
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1.Introduction
1 Introduction 2 Main research hot points 3 Simulation based on OPNET
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3.Simulation base on OPNET
Node mode and process mode
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3.Simulation base on OPNET
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2.Main research hot points • Energy saving mechanism
The access network consumes 70% energy of all network; ONUs consume 60%-80% energy of PON. The typical technology is ONU sleep-mode and energy-aware routing algorithm.
Introduction of Fiber-Wireless Access Network
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Contents
1 Introduction 2 Main research hot points 3 Simulation based on OPNET
2
1.Introduction
OAN access
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2.Main research hot points
中心局 CO
PON接口(工作) PON接口(备用)
OLT
主干光纤 feeder fiber
光分路器 2:N splitter
…
ONU 1 PON接口
ONU N PON接口
用户 用户
Fig.6 Illustration of feeder fiber protection approach