1. Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [EGTS Subgroup Report for IEEE e]
Date Submitted: [September 21, 2009]
Source: [Myung Lee, Gahng-Seop Ahn, Tae Rim Park, Liang Li, Seong-Soon Joo, Betty Zhao, Ghulum Bhatti, Ning Gu, Jie Shen, Wei Hong, Qin Wang, Quan Wang, and Ping Wang]
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Re: [IEEE P e]
Abstract: [This document describes the EGTS subgroup report for IEEE e. Currently, EGTS subgroup document comprises contributions from CUNY, ETRI, Samsung, Huawei, MERL, Vinno, SIMIT, Arch Rock, USTB, Shenyang Inst. of Automation]
Purpose: [Discussion in e Task Group]
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

2. EGTS Subgroup Report
Myung Lee
CUNY

3. This EGTS subgroup report
Refers to doc. 09/0183r2 -EGTS July09 subgroup report
EGTS superframe, channel diversity, GTS information, Group ACK, Beacon scheduling, Time Sync, GTS information, QoS
2. Covers EGTS subgroup activities after July 09 meeting
Asynchronous channel adaptation (09/308r4)
Provision for Power Saving in Beacon-enabled mode (09/0514r1)

4. Asymmetric Channel Adaptation -Motivation
Densely deployed large scale network in geographically large area
The variance of channel condition is large.
Channel Asymmetry.
Common channel approach is limited
Therefore, multi-channel adaptation is required.
Smart Meter
Smart Meter
Smart Meter
Concentration Point
Smart Meter
Smart Meter
Smart Meter
Smart Meter
Smart Meter

5. Multi-channel Active Scan
A device perform active scan for all Cmax channels twice at worst case.
For example,
Cmax = 4, Coordinator’s designated channel is C4, New device’s good channel is C3.
Channel C4 C1 C2 C3 C4 C3 C4
Coordinator T T
New Device
Channel C1 C2 C3 C4 C1 C2 C3 C4 C3
Beacon Request
Beacon
Association Request
Association Response

6. Multi-channel Hello
A device can send a multi-channel hello message to its one-hop neighbors to inform its designated channel.
The device should send the same hello message on each channel sequentially starting from its designated channel.
Optional: The device can request hello reply by setting a flag in the hello message.
Two Neighbor Example:
Cmax = 4, Coordinator’s designated channel is C4, New device’s good channel is C3.
Channel C4 C3 C4
Neighbor 1 T
New Device
Channel C3 C4 C1 C2 C3
Hello
Hello Reply
Neighbor 2 C2 C3 C2
Channel

7. RI-MAC Receiver-Initiated Scheme
Periodically wake up, transmit Data Request command, then wait a short period of time and go back to sleep
Enable the receiver and wait for Data Request command if there is data from higher layer
Upon reception of a Data Request command, the source node transmit data

8. Summary of changes Modified / New MAC primitives (6)
MCPS-DATA, MLME-GTS, MLME-EGTSinfo, MLME-START, MLME-LINKSTATUSPRT, MLME-Scan-Request
New MAC PIB attributes (18)
macMultisuperframeOrder, macConnecDev, macEGTSABT (Allocation Bitmap Table), macEGTSACT (Allocation Counter Table), macChannelDiversityMode,.., macLowEnergySuperframeSupported
Modified / New MAC command frame (10)
Association request, EGTS handshake, EGTS information request, EGTS information reply, Beacon allocation notification, Beacon conflict notification, Link status report, Asymmetric multi-channel beacon request, Multi-channel hello, Channel probe
New fields in Beacon Payload (4)
EGTS superframe descriptor, Beacon bitmap, ChannelHoppingSpecification, Time synchronization specification

9. EGTS-based Superframe Structure (1)
A new sub-field in Beacon payload
EGTS Superframe Specification
– macMulti-SuperframeOrder (MO) 9

10. Modifications for power saving
Superframe
Suppression of beacons to preserve EGTS superframe structure: combination of BO and the status of PIB macLowEnergySuperframeSupported
CAP Period
When the PIB “False”
Data transmission should end one IFS before the end of CAP period because CFP follows immediately after CAP in EGTS superframe
When the PIB “True”
Data transmission continue but should end before the inactive period ends
No CFP shall exist to avoid the interference from CAP

11. Thank you!