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 consideration
Notice: 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>
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2. Multiple Application for Chinese SUN
Smart Grid and Smart home
Energy monitoring and measurement
Direct load control
Remote Diagnosis and control
WAMACS (Wide Area Measurement and Control System)
Synchrophasor measurement
Reliable wide area communication network
Grid Device online monitoring
Transformer monitoring
Disjunctor monitoring
line capacity monitoring

3. Basic Requirement for MAC
Compatible interface design with MAC
Coexistence with other systems in the same band（s）
Common interface to support:
Different frequency
470～510MHz (Chinese Measurement Instrument)
780MHz (CWPAN and 15.4c)
868, 915, 2400MHz (15.4)
Different Modulation
DSSS on Broad Bands
FSK or GFSK on Narrow Bands
Low Delay
High reliability
Ensure synchronizing precision
Low energy consumption, long lifetime

4. Hierarchical network structure
Some key Functions
Hierarchical network structure
The network deployment is inequality and heterogeneous
Coordinators/routers are more powerful to ensure reliability
Multi-channel supporting
Asynchronous method
Synchronous method

5. Hierarchical network structure
Backbone
Coordinator/router act as backbone
No common channel, multi-channel mesh
Local grid
Local grid nodes act as cluster/Tree
single channel, modified 15.4MAC

6. Multi-channel supporting MAC: Asynchronous method（1）
No common channel, multi-channel mesh
Receiver-based channel Adaptation
Non-beacon, wake-up/sleep duty cycle

7. Asynchronous method（2）
Sender-driven communication
Each 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 GTS
EGTS slot = tuple (time slot, channel)
More than one slot can be allocated for each link (Tx & Rx pair).
Multi-hop extension for EGTS
The 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 EGTS
A 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 symbols
EGTS Slots …
Channels
CH0
CH1
CH2

9. Behaviors Supported by 4e MAC
Enhanced ACK
Secure and robust ACK
Group ACK
Reduced MAC header
Resource scheduling
Multiple QoS support
Distributed slot and channel allocation
Distributed beacon scheduling
Backward compatibility to
Multiple topologies support
Tree and mesh and star
Channel diversity
Controlled channel hopping
Adaptive slot and channel allocation
Optional distributed channel hopping
Time synchronization
Relative & Absolute
Low power
Sampled listening
CAP reduction

10. MAC for both 4e and 4g
Now 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.

11. Thank you <author>, <company>
doc.: IEEE <doc#>
<month year>
Thank you
July. 2009
HQ Huang, J.Shen
Slide 11
<author>, <company>
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