乡镇OTN规划及组网架构分析

doi:10.11959/j.issn.1000-0801.2020026

Abstract

Abstract:

Optical transport network has become one of the mainstream technologies for transport networks with its technological advantages.The previous OTN was mainly deployed in the county and above.With the vigorous development of family broadband services in rural,it is necessary to sink OTN to the level of rural to meet the needs of rapid development in rural areas.Based on the development of family broadband services,a variety of rural OTN system capacity measurement methods were provided and the best rural OTN system networking architecture was analyzed,which could play the reference and thought for the rural OTN in the related future research.

Key words: rural optical transport network, capacity calculation, network architecture

CLC Number:

TN913

Wenyue CHEN,Yuneng CHEN,Cheng CHEN,Tingjing ZHANG. Analysis of rural OTN network planning and networking architecture[J]. Telecommunications Science, 2020, 36(2): 137-144.

Figures/Tables 12

References 12

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业务模型	2019年年底					2020年年底
	上网业务		视频业务			上网业务		视频业务
	100 Mbit/s以上	50~100 Mbit/s	其他	4K	高清	100 Mbit/s以上	50~100 Mbit/s	其他	4K	高清
忙时平均速率/（Mbit·s^-1）	1.8	1.2	0.65	20	4	1.9	1.2	0.65	20	4
渗透率	50%	39%	11%	60%		70%	27%	3%	70%
点播业务占比				27%	73%				30%	70%
并发率	70%			30%		70%			30%
忙时户均速率/（Mbit·s^-1）	1.0			1.5		1.2			1.8
忙时户均速率/（Mbit·s^-1）	2.5					3.0

地市	乡镇及农村用户数/万户	乡镇数量/个	2019年年底家庭宽带户均忙时速率/（Mbit·s^-1）	2019年年底平均单乡镇所需带宽/（Gbit·s^-1）	2019年年底平均单乡镇OTN配置电路/条
地市	乡镇及农村用户数/万户	乡镇数量/个	2019年年底家庭宽带户均忙时速率/（Mbit·s^-1）	2019年年底平均单乡镇所需带宽/（Gbit·s^-1）	10GE电路	GE电路
A市	35	98	2.5	17.86	2	16
B市	22	97		11.34	2	16
C市	14	124		5.65	0	16
D市	15	77		9.74	0	16
E市	13	122		5.33	0	16

地市	乡镇数量/个	2019年年底平均单乡镇OLT上联所电路总数/条		2019年年底平均单乡镇OTN配置电路/条
地市	乡镇数量/个	10GE电路	GE电路	10GE电路	GE电路
A市	98	4	8	4	16
B市	97	4	2	4	16
C市	124	4	2	4	16
D市	77	2	2	2	16
E市	122	2	2	2	16

对比维度	方式1		方式2
基础数据	较少	仅需收集宏观数据：如乡镇数量、用户数量等	较多	需收集微观数据，如省内现网全部乡镇及农村每端OLT的实际流量、峰值流量等
测算复杂度	较低	（1）只需通过公式即可计算出平均单乡镇带宽，较为方便；（2）以地市为单位进行规划，规划量较小	较高	（1）需统计省内全部OLT现网流量以及未来流量；（2）需要将每个乡镇内的全部OLT设备流量进行求和，工作量较大；
				（3）以乡镇为单位进行规划，规划量较大
测算时长	较短	规划方式较为简单且统计量小，所需时长较短	较长	规划方式较为复杂且统计量大，所需时长较长
测算精准度	低	（1）以地市为单位进行规划，仅能规划出该地市全部乡镇的平均带宽，无法精准到具体的某个乡镇；（2）若乡镇之间家庭宽带用户数差异较大，则可能出现部分乡镇带宽冗余度过高而部分乡镇流量溢出	高	（1）以乡镇为单位进行规划，能够精确测算出每个乡镇所需的电路数；（2）不同乡镇可按需配置电路，提供了个性化配置服务；（3）避免了流量溢出或冗余过高的情况发生

单个乡镇系统组建的乡镇数量（n）	单乡镇可配置波道数（Y₁）	乡镇光缆纤芯需求（Y₂）	县城至乡镇的光方向数量（Y₃）
1	40	16	8~18
2	20	8	4~9
3	13.3	6	3~6
4	10	4	4~5
5	8	4	2~4
6	6.7	4	2~3
7	5.7	4	2~3
8	5	2	2~3

Analysis of rural OTN network planning and networking architecture

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对比维度	方案1		方案2
建设难度	易	单系统OTM站点数少	难	单系统OTM站点数量多
维护性能	方便	同一系统OTM站点所属区域相同，网络结构清晰，业务归属明了，电路配置简单	复杂	同一系统 OTM 站点所属区域统不同，乡镇上联电路需要跨县穿通，配置复杂，增加维护难度
资源消耗	多	纤芯资源需求4芯	少	纤芯资源需求2芯

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