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1 <author>, <company> doc.: IEEE <doc#><month year>Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)Submission Title: [ Supporting 4E/4G Joint MAC Functions for Smart Grid ]Date Submitted: [8 July, 2009]Source:  Company [SIMIT, Vinno, Huawei]Address [No.865 Changning Road, Shanghai, , China]Voice:[ ], FAX:[ ], [Re: [IEEE g group]Abstract: A proposal of MAC layer for Smart Grid to meet the requirement and characteristic.Purpose: Presented to the g SUN Task Group for considerationNotice: This document has been prepared to assist the IEEE P It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P<author>, <company>Page 1
2 Multiple Application for Chinese SUN Smart Grid and Smart homeEnergy monitoring and measurementDirect load controlRemote Diagnosis and controlWAMACS (Wide Area Measurement and Control System)Synchrophasor measurementReliable wide area communication networkGrid Device online monitoringTransformer monitoringDisjunctor monitoringline capacity monitoring
3 Basic Requirement for MAC Compatible interface design with MACCoexistence with other systems in the same band（s）Common interface to support:Different frequency470～510MHz (Chinese Measurement Instrument)780MHz (CWPAN and 15.4c)868, 915, 2400MHz (15.4)Different ModulationDSSS on Broad BandsFSK or GFSK on Narrow BandsLow DelayHigh reliabilityEnsure synchronizing precisionLow energy consumption, long lifetime
4 Hierarchical network structure Some key FunctionsHierarchical network structureThe network deployment is inequality and heterogeneousCoordinators/routers are more powerful to ensure reliabilityMulti-channel supportingAsynchronous methodSynchronous method
5 Hierarchical network structure BackboneCoordinator/router act as backboneNo common channel, multi-channel meshLocal gridLocal grid nodes act as cluster/Treesingle channel, modified 15.4MAC
6 Multi-channel supporting MAC: Asynchronous method（1） No common channel, multi-channel meshReceiver-based channel AdaptationNon-beacon, wake-up/sleep duty cycle
7 Asynchronous method（2） Sender-driven communicationEach device is listening to its own channel.The sender device switch to the receiver’s channel, transmit Wakeup command and switch back to its own channel, waiting for receiver’s confirm.The receiver reveived the Wakeup command, switch to sender’ s channel, and transmit confirm, then switch back to its own channel, waiting for DATA frame.The sender device switch to receiver’s channel, transmit DATA frame.The receiver device switch to the sender’s channel and transmit a ACK frame (if requested).
8 Synchronous method – modified 15.4e EGTS Common channel : Beacon and CAP use a fixed single channel.Multi-channel for Enhanced GTSEGTS slot = tuple (time slot, channel)More than one slot can be allocated for each link (Tx & Rx pair).Multi-hop extension for EGTSThe usage of EGTS is extended to the nodes beyond one hop distance from PAN coordinator.Beacon scheduling is required to provide multi-hop connection.Multi-superframe extension for EGTSA multi-superframe consists of N superframes.The allocation pattern is repeated every multi-superframe.We define MO (multi-superframe order) such that N = 2(MO – SO), where MO ≥ SO.Multi-superframe Duration MD = aBaseSuperframeDuration*2MO symbolsEGTS Slots…ChannelsCH0CH1CH2
9 Behaviors Supported by 4e MAC Enhanced ACKSecure and robust ACKGroup ACKReduced MAC headerResource schedulingMultiple QoS supportDistributed slot and channel allocationDistributed beacon schedulingBackward compatibility toMultiple topologies supportTree and mesh and starChannel diversityControlled channel hoppingAdaptive slot and channel allocationOptional distributed channel hoppingTime synchronizationRelative & AbsoluteLow powerSampled listeningCAP reduction
10 MAC for both 4e and 4gNow 4e MAC is a full functional MAC with all above features and capable of supporting 4g PHY and Applications.4e MAC has already supported various industrial applications, so setting a new MAC for 4g is not the best choice for many companies.4e/g liaison can be an efficient way to resolve all the problems about MAC.