1. Request Element for DFS in TGh
March 2002
doc.: IEEE /215r0
March 2002
Measurement/Quiet
Request Element for DFS in TGh
A. Soomro and S. Choi
PHILIPS [amjad.soomro,
A. Soomro & S. Choi, Philips
A. Soomro & S. Choi, Philips

2. Introduction Current mechanisms Issues Proposed Changes Conclusions
March 2002
Introduction
Current mechanisms
Measurement Requests in h/D1.1
Measurement Interval Frame in 01/532 for IBSS DFS
Issues
Meeting DFS regulatory requirements?
Latency
Multiple frame formats
Proposed Changes
Conclusions
A. Soomro & S. Choi, Philips

3. Channel Measurement Method Element
March 2002
doc.: IEEE /215r0
March 2002
The Current Mechanism
The Channel Measurement Request frame
Basic Measurement Method
octets: 1
Spectrum Management
(category 4)
Channel MeasReq
(action 0)
Activation Delay
Dialog Token
Channel Measurement Method Element
octets:
octets: 1
Element ID
(37)
Length
(4+n)
Measurement Duration
Channel Numbers
Report Type
octets: 2
octets: n
Report Time Limit
A. Soomro & S. Choi, Philips
A. Soomro & S. Choi, Philips

4. Non- Measurement Duration
March 2002
The Current Mechanism
CF Channel Measurement Method element
octets: 1
octets: 1
octets: 2
octets: 1
octets: 1
Element ID
(38)
Length (6+n)
Measurement Duration
Measurement Offset
Non- Measurement Duration
Channel Numbers
Report Type
octets: n
octets: 1
Report Time Limit
A. Soomro & S. Choi, Philips

5. Proposed Measurement Interval Frame (Previous)
March 2002
Proposed Measurement Interval Frame (Previous)
Measurement Interval need
To perform ‘clean’ measurements in the current channel
Likely regulatory requirements compliance
To monitor other channels while continuing network operations
Previous proposal in S. Black et. al. (01/532r0a)
Frame Control
Duration
RA Broadcast Address
BSSID
Quiet Period
FCS
Octets:2 2 6 4
A. Soomro & S. Choi, Philips

6. The Issues Meeting DFS Regulatory requirements? Latency
March 2002
The Issues
Meeting DFS Regulatory requirements?
Expected
Unknown  Flexibility
Latency
Several beacon periods
Channel access
DCF and other known access issues
Multiple formats
NEED: A unified and simplified approach
A. Soomro & S. Choi, Philips

7. Proposed Single Element
March 2002
Proposed Single Element
Measurement/Quiet Request Element format
Length
Element ID
Count
Offset
Quiet Time
Channel List
Channel Number
...
Measurement Time
Octets: 1 1 2
Measurement ID
... 1 n
...
Measurement ID
... 1 n
A. Soomro & S. Choi, Philips

8. Field Definitions Quiet Time Count Offset
March 2002
Field Definitions
Count
The number of beacon intervals that this measurement shall be repeated
Offset
The time interval in TUs starting from TBTT after which the STA shall not transmit (and do measurements if indicated).
Quiet Time
The time interval in TUs starting from the end of ‘Offset’ that the STA shall NOT transmit (and do measurements if indicated).
A. Soomro & S. Choi, Philips

9. Field Definition Measurement/Quiet Time
March 2002
Field Definition
Measurement/Quiet Time
Count = 0xFF can be reset via another Measurement/Quiet Request frame
Count = (Reserved)
Count = 1 … 0xFE (Permitted)
Count = 0xFF (Forever)
Count = 1
Quiet Time
Offset
TBTT
TBTT
A. Soomro & S. Choi, Philips

10. Channel List ... Length = 0  No measurements with quiet period Length
March 2002
Channel List
Channel Number
Length
...
Length = 0  No measurements with quiet period
A. Soomro & S. Choi, Philips

11. Measurement/Quiet Request Element Usage Examples
March 2002
Measurement/Quiet Request Element Usage Examples
For quieting the channel
Set Channel List.Length = 0
Specify quiet time, Count  0xFF
For quieting the channel and doing measurements
Set Channel List.Length  0
For quieting the channel periodically
Specify quiet time and Count = 0xFF
For Immediate action
Set Activation Delay = 0
Activation Delay is part of Action Frame Format including the element
A. Soomro & S. Choi, Philips

12. Conclusions Single element for measurement and quiet requests
March 2002
Conclusions
Single element for measurement and quiet requests
Reliable transmission
Simplified - Unified
Enables meeting regulatory requirements.
A. Soomro & S. Choi, Philips