doc.: IEEE 802.15-09-0504-01-004g

Submission

Project: IEEE P802.15 Working Group for Wireless Personal Area Networks Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)(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, 200050, China] Voice:[+86 21 6251 1070], FAX:[+86 21 6213 2314], E-Mail:[ huangheqing@mail.sim.ac.cn, sqinghe@mail.sim.ac.cn]Re: [IEEE 802.15.4g group]

Abstract: A proposal of MAC layer for Smart Grid to meet the requirement and characteristic.

Purpose: Presented to the 802.15.4g SUN Task Group for considerationNotice: This document has been prepared to assist the IEEE P802.15. 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 P802.15.

doc.: IEEE 802.15-09-0504-01-004g

Submission

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

doc.: IEEE 802.15-09-0504-01-004g

Submission

Basic Requirement for MAC– Compatible interface design with 802.15.4 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

doc.: IEEE 802.15-09-0504-01-004g

Submission

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

doc.: IEEE 802.15-09-0504-01-004g

Submission

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

doc.: IEEE 802.15-09-0504-01-004g

Submission

Multi-channel supporting MAC:Asynchronous method（ 1）

• No common channel, multi-channel mesh• Receiver-based channel Adaptation• Non-beacon, wake-up/sleep duty cycle

doc.: IEEE 802.15-09-0504-01-004g

Submission

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).

doc.: IEEE 802.15-09-0504-01-004g

Submission

Synchronous method – modified 15.4e EGTS

CAP0

Superframe

Beacon slot(Beacon)

Beacon Interval

CAP

Multi-Superframe Multi-Superframe

Beacon slot(Beacon)

CAP3 CAP

CAP

CAP

CAP

CAP

CAP

CAP

CAP

CAP

CAP

CAP

CAP

CAP

EGTS Slots

…

Channels

CH0

CH1

CH2

• 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

doc.: IEEE 802.15-09-0504-01-004g

Submission

Behaviors Supported by 4e MAC• Multiple topologies support

– Tree and mesh and star

• Channel diversity– Controlled channel hopping– Adaptive slot and channel

allocation– Optional distributed channel

hopping

• Time synchronization

• Low power– Sampled listening– CAP reduction

• 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 802.15.4 -2006

doc.: IEEE 802.15-09-0504-01-004g

Submission

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.

doc.: IEEE 802.15-09-0504-01-004g

Submission

Thank you

July. 2009 HQ Huang, J.Shen Slide 11