A Management Interface for Maintenance and Fault Analysis Date 20150915 Authors Slide 1 September 2015 Wang Hao Fujitsu RampD Center Abstract This document addresses the faults encountered in home network environment investigated by ID: 1001957
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1. September 2015Wang Hao, Fujitsu R&D CenterA Management Interface for Maintenance and Fault AnalysisDate: 2015-09-15Authors:Slide 1
2. September 2015Wang Hao, Fujitsu R&D CenterAbstractThis document addresses the faults encountered in home network environment investigated by TTC.Based on the work, a proposal to specify a management interface between IEEE 802.11 and external networks for maintenance and fault analysis is made.Slide 2
3. Expect Home WLAN to Perform Well?Wang Hao, Fujitsu R&D CenterSeptember 2015Home network (HN) becomes denserincreased 6.5% year over year in 4Q14802.11ac WLAN revenues grew 155.6% year over year, with shipments increasing 206.6% (data from IDC)carries heavier load and more diverse traffic8K UHD Wireless Transfer at Smart HomeAugmented Reality/Virtual Reality Headsetswearables devicesin a more complicated environmentMore channel competitors, such as neighbor’s wireless, appliances, etcComplicated indoor scenarios, such as doors, walls and glasses, etcRandom installation, inappropriate configuration, lack of experience and expertiseSlide 3
4. September 2015Wang Hao, Fujitsu R&D CenterUsers Complaint about Home WLANTR-1057 (TTC, Telecommunication Technology Committee, Japan) summarizes 3 fault scenarios Sometimes can’t connect, when connected network speed is lowSometimes certain device is disconnected frequentlySometimes all devices are disconnected and 16 fault descriptions of user complaints, for exampleAP can’t find an opportunity to communicate with device, because neighboring AP occupies the same or adjacent channelWhen serving AP is in standby but neighboring AP occupies the same or adjacent channel, devices try to connect to serving AP again and againCertain device constantly occupies the channel, therefore AP can’t transmit to this device (a/b/g/n/ac… mixed scenario)Certain device constantly occupies the channel, therefore AP and other devices can’t transmit….Table 2-1 Fault descriptions, TR-1057, original written in JapaneseSlide 4
5. Major Causes4 types of causes led to those faults occurred during connection and communicationWang Hao, Fujitsu R&D CenterSeptember 2015No.Fault CausesDescription1Wireless channelproblems encountered when using wireless channel, such as too many devices, inside and outside BSS, compete for channel access2Wireless communicationWireless transmission problems such as the radio propagation between AP and devices, interference, degradation, multipath caused by reflection 3MisconfigurationInitialization mistake, reset to default setting by mistake, etc4Device faultHardware problem, power issue, out of battery, etcTable 2-2 fault causes, TR-1057, original written in JapaneseSlide 5
6. How to Analyze the Faults and CausesFault diagnosis is difficult, that is even more difficult with too limited information about wireless and internal settingsTR-1057 suggests to implement the following functions in advance to make the analysis easierSelf check (settings of 802.11 NIC, internal status)Network disconnection check for devicesPairing information checkChannel utilization, or channel status checkSignal strength measurementCommunication error rate measurement (PER, BER, etc)Wang Hao, Fujitsu R&D CenterSeptember 2015Slide 6
7. Interface for Maintenance and Fault AnalysisWang Hao, Fujitsu R&D CenterSeptember 2015AP fromA companyAP fromB companyAP fromC companySTASTASTAMeasurementreportManagementreportWLAN radio MeasurementConfigurationStatus, settingsCommunication statistics802.11 data communicationWireless network management…Home networkexternal networkHN userAP for 802.11App developer/userService providerComplied with ITU-T Y.2070InternetManagement PFResource managementWLAN planningWLAN fault analysisBuilding WLAN monitorSTA operationHome gateway (HGW)Resource information collector802.11 networkHN adminApplication InterfaceManagement InterfaceSlide 7
8. The Merits to Specify the Management Interface by 802.11 StandardFor application developers provide various services by programming with the application interface on the management PF.For HN administratorsInstalling AP or home GW will be as easy as plug-and-playNo need to concern about wireless connection anymoreFor usersHN becomes truly ‘invisible’For service providersMaintain the whole system and the 802.11 networks remotelyLow cost costumer support and efficiently handle user complaintsFor 802.11Unified user experienceA stronger, securer, authentic ecosystemWang Hao, Fujitsu R&D CenterSeptember 2015Slide 8
9. APFor monitoring 802.11 resources‘BYOD’ APManagement PFFor data storage & analysis engineHGWFor security, protocol translationInterface on LayersWang Hao, Fujitsu R&D CenterSeptember 2015Resource managementConfig&statusIPSTA‘BYOD’ STA802.11 protocolMACPHYAPPPrimitives & MIBVendor specific valuesComm statistics802.11 measurement & managementApplicationVisualizeFault analysis802.11 interfaceApplication interfaceResource Information collectorManagement agentManagement InterfaceIP interfaceIP interfaceSlide 9
10. Example of Information ExchangeManagement TypesInformation TypesExamples of InformationFault Causes*Configuration and settingparameter in primitives‘reason code’ in MLME-DEAUTHENTICATE.requestMisconfiguration and device faultAttributes from MIBdot11BeaconPeriodData communication statisticsparameter in primitives‘Transmission Status’ in MA-UNITDATA-STATUS.indicationWireless communication and wireless channelValues defined by specificationCCA thresholdWireless statisticsWireless LAN radio measurements resultsChannel Usage elementWireless communication and wireless channelNetwork managementWireless network managementDiagnostic elementsMisconfiguration and Wireless communication and wireless channelWang Hao, Fujitsu R&D CenterSeptember 2015* Refer to Slide 5, defined by TTC report TR-1057, original written in Japanese Slide 10
11. Some Experimental ResultsWang Hao, Fujitsu R&D CenterSeptember 2015Mid-night, stable RSSIMorning and noon, microwave usedWiFi & people moving all work timeRSSI and retry ratioSlide 11
12. September 2015Wang Hao, Fujitsu R&D CenterReferences11-12-1245-04-00aj-ieee802-11aj-usage-models11-13-0313-00-0wng-usage-models-for-next-generation-wi-fi11-15-0625-02-00ay-ieee-802-11-tgay-usage-scenariosTTC Technical Report TR-1057, “customer support guideline for home network service”ITU-T Y.2070, “Requirements and architecture of home energy management system and home network services”