March 2005

Jason Liu and Justin McNew, TechnoComSlide 1

doc.: IEEE 802.11-05/0217r0

Submission

WRSS Discussions

Notice: This document has been prepared to assist IEEE 802.11. 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.

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Date: 2005-03-11

Name Company Address Phone email Jason Liu TechnoCom

Corporation 16133 Ventura Blvd, Suite 640, Encino, CA 91436

818-501-1906 jliu@technocom-wireless.com

Justin McNew

TechnoCom Corporation

16133 Ventura Blvd, Suite 640, Encino, CA 91436

818-501-1903 jmcnew@technocom-wireless.com

Authors:

March 2005

Jason Liu and Justin McNew, TechnoComSlide 2

doc.: IEEE 802.11-05/0217r0

Submission

Abstract

In order to differentiate from other 802.11 measurement types, the term of High Resolution RSSI (HRRSSI) was changed to WAVE Received Signal Strength (WRSS) during IEEE 802.11p interim session in January 2005.

• HRWRSS in the current 802.11p draft is reviewed.

• A complete solution for PHY to enter / exit WRSS measurement mode (through PLME_SAP) is proposed.

• WRSS request and report are defined as new measurement types based on 802.11h

• dot11WRSSCapabilityClass

March 2005

Jason Liu and Justin McNew, TechnoComSlide 3

doc.: IEEE 802.11-05/0217r0

Submission

HRWRSS Overview in 802.11p draft

HRWRSS measurement requirements:– Resolution of 0.2 dBm within -60 to -30 dBm.

– Accuracy of ± 3 dB across the entire operating temperature.

Entering or exiting HRWRSS mode is through PHY_SAP:

PHYMAC

PHY-HRWRSS.req(switch)

PHY-HRWRSS.ind

March 2005

Jason Liu and Justin McNew, TechnoComSlide 4

doc.: IEEE 802.11-05/0217r0

Submission

A complete solution to enter / exit WRSS measurement mode

March 2005

Jason Liu and Justin McNew, TechnoComSlide 5

doc.: IEEE 802.11-05/0217r0

Submission

PLME_SAP

Entering or exiting WRSS measurement mode is a management activity so that it can be implemented through PLME_SAP:– Add dot11WRSSMode to PHY MIB

PLMEWME/MLME

PLME-set.ind(dot11WRSSMode, value)

PLME-set.cfm(status, dot11WRSSMode)

March 2005

Jason Liu and Justin McNew, TechnoComSlide 6

doc.: IEEE 802.11-05/0217r0

Submission

WME_SAP

• Application to request changing WRSS measurement mode:– WSIE includes WRSS Measurement Mode information.

– During application initialization through WSIE, an OBU enters WRSS Measurement Mode (e.g. lock AGC).

– After application completion, an OBU exits WRSS Measurement Mode (e.g. unlock AGC).

March 2005

Jason Liu and Justin McNew, TechnoComSlide 7

doc.: IEEE 802.11-05/0217r0

Submission

Complete Illustration

WME MLME WMEMLME/PLME APPAPP

Application initialization (WSIE contains the WRSS mode info)

Application completion

PLME-SET.ind: enter WRSS mode

PLME-SET.cfm

WME-SET.ind

WME-SET.cfm

MLME-WRSS.req WRSS Request frame

MLME-WRSS.cfm WRSS Report frame (WRSS)

…...

PLME-SET.ind: exit WRSS mode

PLME-SET.cfm

WME-SET.ind

WME-SET.cfm

March 2005

Jason Liu and Justin McNew, TechnoComSlide 8

doc.: IEEE 802.11-05/0217r0

Submission

802.11h Measurement Types (Request)

March 2005

Jason Liu and Justin McNew, TechnoComSlide 9

doc.: IEEE 802.11-05/0217r0

Submission

802.11h Measurement Types (Report)

March 2005

Jason Liu and Justin McNew, TechnoComSlide 10

doc.: IEEE 802.11-05/0217r0

Submission

WRSS request element

• Defined as a new 802.11h measurement type:

Name Measurement Type

Basic request 0

Clear Channel Assessment (CCA) request

1

Receive power indication (RPI) histogram request

2

WRSS request 3

March 2005

Jason Liu and Justin McNew, TechnoComSlide 11

doc.: IEEE 802.11-05/0217r0

Submission

WRSS request element (cont’d)

• The measurement request field corresponding to a WRSS request is shown below.

.

Channel Number

Octets: 1

Measurement Request field format for a WRSS request

March 2005

Jason Liu and Justin McNew, TechnoComSlide 12

doc.: IEEE 802.11-05/0217r0

Submission

WRSS report element

• Defined as a new 802.11h measurement type:

Name Measurement Type

Basic report 0

Clear Channel Assessment (CCA) report

1

Receive power indication (RPI) histogram report

2

WRSS report 3

March 2005

Jason Liu and Justin McNew, TechnoComSlide 13

doc.: IEEE 802.11-05/0217r0

Submission

WRSS report element (cont’d)

• The measurement report field corresponding to a WRSS report is shown below.

.

Measurement Report field format for a WRSS report

Octets

Channel Number

TimeStamp

1 8

WRSS Value

1

March 2005

Jason Liu and Justin McNew, TechnoComSlide 14

doc.: IEEE 802.11-05/0217r0

Submission

WRSS value mapping

• The WRSS value in a WRSS report element is an integer from 0 to 255.

• The mapping to the range from -60 dBm to -30 dBm with a resolution of 0.2 dBm is shown below.

WRSS value in dBm

0 -60

1 -59.8

2 -59.6

…… ……

149 -30.2

150 -30

151 ~ 255 reserved

March 2005

Jason Liu and Justin McNew, TechnoComSlide 15

doc.: IEEE 802.11-05/0217r0

Submission

dot11WRSSCapabilityClass

• If necessary, WRSS capability classes can be defined to indicate a device capability on WRSS, for example:

• Class1: – accuracy = 3 dB,

– resolution = 0.2 dBm,

– range -60 dBm to -30 dBm.

• Class2: – accuracy = 5 dB,

– resolution = 0.5 dBm,

– range -110 dBm to 0 dBm.