Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized...
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Transcript of Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized...
![Page 1: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/1.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 1
Proposal of Synchronized Quiet Period for Incumbent User
Detection Date: 2010-March
Authors:
Name Company Address Phone email Zhou Lan NICT 3-4 Hikarino-oka, Yokosuka, Japan +81-46-847-5097 [email protected] Chin Sean Sum NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Junyi Wang NICT 3-4 Hikarino-oka, Yokosuka, Japan junyi.wang @nict.go.jp Chen Sun NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Yohannes Alemseged NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Ha Nguyen Tran NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Chang Woo Pyo NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] M. Azizur Rahman NICT 3-4 Hikarino-oka, Yokosuka, Japan aziz @nict.go.jp Tuncer Baykas NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Gabriel Villardi NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Chunyi Song NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Stanislav Filin NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected] Hiroshi Harada NICT 3-4 Hikarino-oka, Yokosuka, Japan [email protected]
![Page 2: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/2.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 2
Abstract• This document proposes a Quiet Period
synchronization mechanism for 802.11af to guarantee the detection of the incumbent user
![Page 3: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/3.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 3
• Refer to FCC 08-260 page 103
• “TV channel availability check time. A TVBD is required to check for TV signals for a minimum time interval of 30 seconds. If a TV signal is detected on a channel indicated as available for use by the database system, the device will provide a notice of that detection to the operator of the device and a means for the operator to optionally remove the channel from the device’s list of available channels”
• “In-service monitoring. A TVBD must perform in-service monitoring of an operating channel a minimum of once every 60 seconds. There is no minimum channel availability check time for in-service monitoring”
FCC Rules Regarding Incumbent User Protection
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doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 4
• Associating STAs with an AP in a BSS based on the STA’s supported channels
• Quieting the current channel so it can be tested for the presence of radar with less interference from other STAS
• Testing channels for radar before using a channel and while operating in a channel
• Discontinuing operations after detecting radar in the current channel to avoid further interfering with the radar
• Detecting radar in the current and other channels based on regulatory requirement
• Discontinuing operations after detecting radar in the current channel to avoid further interfering with the radar
• Requesting and reporting measurements in the current and other channels
• Selecting and advertising a new channel to assist the migration of a BSS after radar is detected
Dynamic Frequency Selection (DFS)
![Page 5: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/5.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 5
• DFS has defined the procedure to quiet the current channel so the channel can be tested for the presence of the incumbent services
• However according to the procedure (11.9.1 IEEE Std 802.11-2007), the affected STAs are confined inside the same BSS or IBSS
• During the period when STAs in a certain BSS are quieted, STAs in an adjacent BSS may still be allowed to transmit
• As a consequence, in the quiet period which is supposed to be used to detect incumbent users, there might be signals from adjacent BSSs, which interfere the detection of incumbent users
• It is important to have a synchronization mechanism to guarantee the clearance of the quiet period for incumbent user detection
Necessity of Synchronized Quiet Period
![Page 6: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/6.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 6
Illustration of the Problem
BSS1
BSS3
BSS2
B B BBSS1 Quiet Quiet
B B BBSS2 Quiet Quiet
B B BBSS3 Quiet Quiet
DS
TV broadcaster
![Page 7: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/7.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 7
• This is no need to mandate Timing Synchronization Function (TSF) for the STAs involved
• There is a means to allow APs exchange information using wireless or wired transmission
• The Quieting Channel for Testing function defined in 802.11 2007 will be used for each BSS to adjust the individual quiet period to align with the requested quiet period
Assumptions
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doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 8
• The purpose of the Quiet Period Synchronization is to guarantee a clear period that will not be used by any 802.11 STAs in the concerned area to meet the requirement of incumbent user detection specified by FCC
• A Quiet Period Synchronization request is sent by an AP to the APs that are members of the ESS as requested in the Quiet Period Synchronization
• The mechanism by which the list of APs in the ESS is determined is outside the scope of this amendment
• The mechanism and algorithm by which to decide which AP will send the Quiet Period Synchronization is outside the scope of this amendment
• The Quiet Period Synchronization request may be sent through wired or wireless connection
• Upon receiving the request, an AP shall respond whether it will perform the Quiet Period Synchronization operation
Usage of the Synchronized Quiet Period
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doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 9
• An AP requesting to start a Quiet Period Synchronization procedure shall send a Quiet Period Synchronization Request frame to the APs that are located in the concerned area
• The Quiet Period Synchronization Request frame contains a dialog token to distinguish requests from different APs
• The Quiet Period Synchronization Request frame contains the BSSID of the APs that the request is sent to
• The Quiet Period Synchronization Request frame contains requested timing information for quiet period synchronization
– Quiet Period Offset: specify the time offset of the starting time of the quiet period relative to the reception of the preamble of the Quiet Period Synchronization Request frame
– Quiet Period: specify the interval between two Quiet Periods
– Quiet Duration: specify the duration of the Quiet period
Requesting a Synchronized Quiet Period
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doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 10
• An AP upon reception of a Quiet Period Synchronization Request frame checks the BSSID contained in the request and shall respond if the BSSID matches
• If the AP is able to adjust the quiet period according to the request, a positive response shall be sent back to the AP initiated the request
• If the AP is not able to adjust the quiet period, a negative response with the reason code shall be sent back the AP initiated the request
Receiving a Request of Synchronized Quiet Period
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doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 11
Synchronized Quiet Period Request Frame
• Quiet Period Synchronization Request frame is a Public Action Frame
Category Action Dialog Token
Protocol Information
Element
Quiet Period Synchronization Request
Element
1 1 2 3 variableOctets:
![Page 12: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/12.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 12
Synchronized Quiet Period Response Frame
• Quiet Period Synchronization Response frame is a Public Action Frame
Category Action Dialog Token
Protocol Information
Element
Quiet Period Synchronization Response
Element
1 1 2 3 variableOctets:
![Page 13: Doc.: IEEE 802.11-10/0256r0 Submission March 2010 Zhou Lan NICTSlide 1 Proposal of Synchronized Quiet Period for Incumbent User Detection Date: 2010-March.](https://reader035.fdocuments.us/reader035/viewer/2022070400/56649f115503460f94c23f2c/html5/thumbnails/13.jpg)
doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 13
Synchronized Quiet Period Request Element
• Quiet Period Synchronization Request element
Element ID
Length Request Token
Quiet Period Offset
Quiet Period
Quiet Duration
Optional Sub-elements
1 1 2 2 1 2 variableOctets:
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doc.: IEEE 802.11-10/0256r0
Submission
March 2010
Zhou Lan NICTSlide 14
Synchronized Quiet Period Response Element
• Quiet Period Synchronization Response element
Element ID
Length Request Token
BSSID Result Reason code
1 1 2 6 1 1Octets: