IEEE 802.21 MEDIA INDEPENDENT HANDOVER DCN: 21-60-0000-01 Title: CMCC Wireless Mesh Trial Network Introduction Date Submitted: March 10, 2010 Presented at IEEE 802.21 session #37 in Orlando Authors or Source(s): Dapeng Liu (China Mobile) Abstract: Brief introduction of CMCC’s trial wireless mesh network 21-09-0071-00-0000

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Contents Motivation and Background Mesh Trial Network and Experiment How to Achieve Carrier Grade HWN How HWN SG Could Help

Motivation and Background Background of CMCC’s WiFi Mesh Trial Network Increasing demand of high bandwidth service In some scenario ,Wireless Mesh Network may provide higher bandwidth service with lower cost Wireless City Projects initiated by local government Wireless Mesh is considered as one of the promising technology in Wireless City Projects Goals of CMCC’s WiFi Mesh Trial Network Gain experience of wireless mesh network design & deployment Test of wireless mesh network’s performance : Performance/capacity/coverage test in urban scenario Service provisioning capability test To see whether wireless mesh network could satisfy our requirement

Usage Scenario of Wireless Mesh Enterprise service Large enterprise coverage Campus Internet service Lack of fixed line infrastructure scenario Rural area No sufficient fixed line infrastructure Difficult to deploy fixed network scenario Inter-buildings coverage Home Internet access service CMCC lacks of fixed line resources Consider to use wireless to provide Internet access service for home users

Contents Motivation and Background Mesh Trial Network and Experiment How to Achieve Carrier Grade HWN How HWN SG Could Help

CMCC’s WiFi Mesh Trial Network Location: Shanghai densely urban area Complex wireless environment: Tall buildings, elevated bridges   High population density  Complex wireless environment

Wireless Trial Network Topology Node 2 Node 3 Node 1 Node 4 Node 5 Coverage of 2.4G Wi-Fi To core network Server a b/g a b/g a b/g a b/g a b/g 5.8GHz(802.11a) uses as backhaul; 2.4G(802.11b/g) uses as wireless access

Experiment Items Mesh functionality experiment Mesh node function experiment Mesh gateway function Mesh repeater function Mesh edge node function Mesh security DHCP relay function Mesh QoS Mesh disaster tolerance experiment Mesh topology discover Auto configuration Self-healing

Experiment Items (cont.) Mesh network handover experiment Intra-domain handover (Walking |30Km/h|60Km/h) Inter-domain handover(Walking |30Km/h|60Km/h) Mesh network performance experiment Capacity experiment 1 hop configuration 2 hop configuration 3 hop configuration …. Coverage experiment Traffic vs distance Latency experiment

Experiment Result Through output declines as hop increases Test Item Mesh network throughput experiment result Test Item 1st hop 2nd hop 3rd hop 4th hop Total AVR MAX 1 hop mesh network throughput (Mbps) Uplink 17.641 22.222 － 17.64 Downlink 18.016 22.857 18.02 2 hop mesh network throughput (Mbps) 9.844 19.512 7.518 10.667 17.36 9.985 23.530 9.191 18.605 19.18 3 hop mesh network throughput (Mbps) 7.186 15.385 5.662 8.696 4.338 6.154 17.19 7.461 16.327 7.044 11.594 4.619 6.612 19.12 4 hop mesh network throughput (Mbps) 5.974 13.333 4.874 10.811 3.489 5.128 3.189 4.571 17.53 6.935 14.815 6.608 10.39 4.209 6.957 1.007 1.424 18.76 Through output declines as hop increases

Experiment Result (cont.) Mesh network latency experiment Result Experiment item Service Ave. Delay (ms) Packet lost rate Single AP latency No FTP load 9 FTP 2M 200 2% FTP no speed limit 117 3% 1 hop latency 10 8 12 2 hop latency 119 3 hop latency 13 0% FTP 5M 4% FTP no speed limit 11 18% 4 hop latency 14 5% 16 7% Latency may not be a significant issue

Conclusions Mesh network basic design principles Tradeoff between coverage/throughput/interference Optimize investment Multi-hop design principle Backup link for robustness Tradeoff between coverage and throughput Hops vs throughput Experience result Limit hops to increase performance

Experience and Conclusions (cont.) Frequency configuration optimization 2.4GHz for access service; 5.8GHz for backhaul to reduce interference Using power control to reduce interference Using directional antenna Better coverage Less interference

Experience and Conclusions (cont.) Different deployment strategy in different scenarios Rural area scenario Optical fiber access can only reach to major towns Very limited fixed line access resources in some villages Wireless mesh is a very promising solution in this scenario Several villages could be connected together to form a mesh network Only few mesh nodes need to have backhaul resources May use microwave as backhaul to form a heterogeneous mesh network

Experience and Conclusions (cont.) Urban area scenario Need 8 mesh devices to coverage 1 sq.km. in ordinary urban area fiber fiber Wireless city scenario Many local governments initiate wireless city project s using mesh

Experience and Conclusions (cont.) Home Internet access service CMCC is lack of fixed line resources in residential areas Outdoor heterogeneous mesh node with 802.11 and microwave as backhaul Indoor mesh node with 802.11 Indoor mesh node with 802.11 Would be a promising approach for the operators that lack of fixed line resources and want to provide home user Internet access service Could also be used as an option for HNB backhaul

Contents Motivation and Background Mesh Trial Network and Experiment How to Achieve Carrier Grade HWN How HWN SG Could Help

Outlook: How to Achieve Carrier Grade Heterogeneous Mesh Network Management Performance monitoring Fault detection and report Topology discover and management Configuration Auto configuration Self healing QoS Network controlled QoS enabled service provision

Contents Motivation and Background Mesh Trial Network and Experiment How to Achieve Carrier Grade HWN How HWN SG Could Help

How HWN SG could Help 802.21 extension may be helpful to improve heterogeneous wireless mesh network’s quality and usability Potential areas that we could work on: Heterogeneous Mesh network configuration Fault detection and report Performance monitoring …..

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