1. March, 2006
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: [proposed merger]
Date Submitted: [8 March, 2006]
Source: [Chun-Ting Chou] Company [Philips]
Address [345 Scarborough Rd, Briarcliff Manor, NY 10510]
Voice:[ ], FAX: [ ],
Re: [N/A]
Abstract: [Summary of agreements and proposed merger]
Purpose: [Summary of agreements and proposed merger]
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
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Chun-Ting Chou, Philips

2. March, 2006
A1: Beaconing
All mesh-capable devices (including PNC and DEV) should send beacons
All beaconing devices may be considered as “PNCs” and therefore, SOP has to be solved 2 1
Master (PNC/FFD)
Slave (DEV/RFD)
Control & Data path
Mesh Control & Data path
Data path
Mesh Data path 6 A 5 C 3 7 4 8 B 9
Inter-piconet
Communications
Source: Michael Sim’s presentation 13
Chun-Ting Chou, Philips

3. A2: Distributed solutions for SOP
March, 2006
A2: Distributed solutions for SOP
No parent/child/neighbor relationship (distributed, peer-to-peer solutions for SOP)
A’s Superframe
Source: Michael Sim’s presentation
B’s Superframe A A B B C
Alignment
C’s Superframe A B C
“beacon period”
Chun-Ting Chou, Philips

4. A3: Alignment of superframes
March, 2006
A3: Alignment of superframes
“Protection” via CTA is based on superframes are aligned & synchronized
Alignment
Medium slot boundary or superframe start time
Synchronization
distributed nature of both solutions
clock drifting
Chun-Ting Chou, Philips

5. Issues being addressed
March, 2006
Issues being addressed
Alignment
Where to align? (both solutions have pros and cons)
What to consider? (complexity, power consumption, efficiency)
Synchronization
Support of CAP
Mandatory or optional?
How?
Chun-Ting Chou, Philips

6. March, 2006
Proposed Merger
When a beaconing device powers up, it scan for at least one superframe and shall attempt to join the existing beacon group, if any (better performance)
When two beacon devices (or two groups) observe each other, they shall “cross protect” each other’s beacon transmission (reduced complexity)
Chun-Ting Chou, Philips

7. Power Consumption Beacon Beacon March, 2006 N=3, improvement =194%
Wake-up time
(~5 ms)
Tx/Rx turnaround time
(~10 us)
Tx/Rx turnaround time +Guard time
(~20 us)
Beacon
Beacon A B C A B C
(Tx/RX) 300 mA
Power = 70*300* *60*3
= =
(Standby) 60 mA
(idle) <1 mA
Make it conservative: Wake up time = 2 ms
N=3, improvement =194%
(Tx/RX) 300 mA
Power = 80*300* *60
= =
(idle) <1 mA
When N increases, improvement increases ( 327% for N=6, 587% for N=infinity)
Chun-Ting Chou, Philips

8. QoS Support for delay-sensitive Apps.
March, 2006
QoS Support for delay-sensitive Apps.
Less fragmented superframes
Fragmented superframes
With less fragmented superframes, PNCs are able to accommodate more time- sensitive applications/streams via CTA re-configuration
Delay Requirement A B C A
CAP/MCTA or BP
With fragmented superframes, the number of sensitive applications/streams can be admitted via CTA re-configuration is limited, even sufficient amount of CTA exists A B C
Chun-Ting Chou, Philips

9. Backward Compatibility
March, 2006
Do we need a CAP? Why not
How to provide a CAP and its functions
Association CAT (slotted Aloha or CSMA/CA)
Open MCTA (slotted Aloha or CSMA/CA)
Open CTA (slotted Aloha or CSMA/CA)
How does a PNC do?
For mesh-capable PNC (use content access CTAs listed above)
For “legacy” PNC (they do whatever they like)
Chun-Ting Chou, Philips