1. <November 2011>
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [Implicit RIT Enhancement to RIT]
Date Submitted: [7 November 2011 ]
Source: [Matt Johnson] Company [Itron]
Address [2111 N Molter RD, Liberty Lake, WA 99019, USA]
Voice:[ ], FAX: [ ],
Re: [ Enhancement of 15.4e RIT for 15.4k]
Abstract: [This document describes an enhancement of 15.4e RIT for 15.4k to improve battery life and availability for downlink communications.]
Purpose: [Proposal for consideration of inclusion into the baseline for the k standard.]
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
Matt Johnson, Itron

2. An enhancement to the 15.4e RIT Protocol
<November 2011>
RIT Enhancement
An enhancement to the 15.4e RIT Protocol
Matt Johnson, Itron

3. <November 2011>
Background
15.4e MAC enhancements add valuable flexibility like RIT, but sensors aren’t always smart enough to know when to ask if there is data queued on the coordinator for them.
And we want some predictability for downlink communications
Also, adding RIT transmissions to query for possible queued data reduces battery life and adds network traffic in addition to regular traffic
Matt Johnson, Itron

4. <November 2011>
Implicit RIT
Implicit RIT turns on the endpoint receiver once after each (asynchronous) transmission (not just after a RIT packet) to enable reception of data from the coordinator
With professional installation, all endpoints are programmed with system-wide defaults at installation.
This approach:
Removes extra network traffic just to query the coordinator for waiting data
Provides predictable availability of endpoints for downlink traffic
All while supporting very long battery life in endpoints
Matt Johnson, Itron

5. Receiver Initiated Transmission (RIT)
<November 2011>
Receiver Initiated Transmission (RIT)
Matt Johnson, Itron

6. <November 2011>
RIT
Matt Johnson, Itron

7. One RX period per Transmission, delay and RX duration set system-wide
<November 2011>
I-RIT
One RX period per Transmission, delay and RX duration set system-wide
Matt Johnson, Itron