1. Null Beacon Energy Conservation concept
November 2006
doc.: IEEE /1461r1
November 2006
Null Beacon Energy Conservation concept
Date:
Authors:
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Peter Ecclesine, Cisco Systems
Peter Ecclesine, Cisco Systems

2. November 2006
doc.: IEEE /1461r1
November 2006
Abstract
Null Beacon Energy Conservation enhances standby time by letting stations get back to sleep sooner
The enhancements are related to TGv Objective: Power Saving (Req. #2010).
The text is aligned with P REVma/D9.0 and P802.11v-D0.04.
Peter Ecclesine, Cisco Systems
Peter Ecclesine, Cisco Systems

3. November 2006
Req 2010: Power Saving
“TGv shall support one or more power saving schemes to optimize the STA’s power consumption during prolonged time periods of no transmission or reception activity in the order of several hundred’s of ms’s or above.”
In every 24/7 week, probably 60 hours are not busy ;-) and when a STA is not transmitting much, it still needs to receive beacon frames from the Access Point
Receiving and processing beacon frames is a substantial component of standby time power consumption
Peter Ecclesine, Cisco Systems

4. November 2006
Overview
[11.2] Power Management uses the Traffic Indication Map (TIM) in every AP beacon frame to indicate that buffered MSDUs are available to STAs that are in Power Save mode.
[ ] A ‘zero TIM’ is a six octet Information Element indicating no buffered MSDUs for any STA.
Observation – Beacons have many elements to support association, and few to support Power Save
Induction – if an alternate Beacon frame is defined, it can be used for overall energy savings
Peter Ecclesine, Cisco Systems

5. Estimating Power Savings
November 2006
Estimating Power Savings
Must process PLCP header in any case
Should process 26 octets of general frame
Frame Control (2) , Duration/ID (2), three address fields (18), FCS
Beacon frames have many additional elements – Table 26 plus an FCS (4)
Timestamp (8), SSID (2-34), Supported rates (3), TIM (6-256), Country (8-256), Power Constraint (3), Supported Channels (4-256), Extended Rates (3-257), Extended Capabilities (3-257)
Minimum power to process beacon frames could be ~ one half of today’s power consumption
Peter Ecclesine, Cisco Systems

6. Null Beacon The Null Beacon indicates:
November 2006
Null Beacon
The Null Beacon indicates:
Zero TIM: a TIM where the DTIM count is zero, and there are no buffered broadcast, multi-cast or unicast frames.
No frame elements requiring action in the regulatory domain (e.g. no DFS Channel Switch Announcement)
Helps with the wireless VLAN problem
Sets of beacon frames for each VLAN means there are lots more beacon frames per second.
Helps in home networks
Multiple WLAN devices in use, many 24/7
Peter Ecclesine, Cisco Systems

7. November 2006
Operational behavior
Null Beacon energy conservation should be used by all TGv compliant STAs in Infrastructure mode (A PC12)
Draft text is 06/1xxx Null Beacon Energy Conservation draft
Peter Ecclesine, Cisco Systems

8. November 2006
Questions/Answers
Peter Ecclesine, Cisco Systems

9. November 2006
Motion
Move to accept 06/1xxxr0 normative text describing Null Beacon Energy Conservation for inclusion into the TGv draft.
In favor:
Not in favor:
Abstain:
Peter Ecclesine, Cisco Systems