1. WRSS Discussions Date: 2005-03-11 Authors: Month YearMarch 2005
doc.: IEEE /0015r0
Month YearMarch 2005
WRSS Discussions
Date:
Authors:
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Jason Liu and Justin McNew, TechnoCom
Bryan Wells, DENSO, LA Labs

2. Month Year
doc.: IEEE /0015r0
Month YearMarch 2005
Abstract
In order to differentiate from other measurement types, the term of High Resolution RSSI (HRRSSI) was changed to WAVE Received Signal Strength (WRSS) during IEEE p interim session in January 2005.
HRWRSS in the current p 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 h
dot11WRSSCapabilityClass
Jason Liu and Justin McNew, TechnoCom
Bryan Wells, DENSO, LA Labs

3. HRWRSS Overview in 802.11p draft
Month Year
doc.: IEEE /0015r0
Month YearMarch 2005
HRWRSS Overview in p 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:
Jason Liu and Justin McNew, TechnoCom
Bryan Wells, DENSO, LA Labs

4. A complete solution to enter / exit WRSS measurement mode
Month Year
doc.: IEEE /0015r0
Month YearMarch 2005
A complete solution to enter / exit WRSS measurement mode
Jason Liu and Justin McNew, TechnoCom
Bryan Wells, DENSO, LA Labs

5. Month Year
doc.: IEEE /0015r0
Month YearMarch 2005
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
Jason Liu and Justin McNew, TechnoCom
Bryan Wells, DENSO, LA Labs

6. WME_SAP Application to request changing WRSS measurement mode:
Month YearMarch 2005
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).
Jason Liu and Justin McNew, TechnoCom

7. Complete Illustration
Month YearMarch 2005
Complete Illustration
Jason Liu and Justin McNew, TechnoCom

8. 802.11h Measurement Types (Request)
Month YearMarch 2005
802.11h Measurement Types (Request)
Jason Liu and Justin McNew, TechnoCom

9. 802.11h Measurement Types (Report)
Month YearMarch 2005
802.11h Measurement Types (Report)
Jason Liu and Justin McNew, TechnoCom

10. WRSS request element Defined as a new 802.11h measurement type:
Month YearMarch 2005
WRSS request element
Defined as a new h measurement type:
Name
Measurement Type
Basic request
Clear Channel Assessment (CCA) request 1
Receive power indication (RPI) histogram request 2
WRSS request 3
Jason Liu and Justin McNew, TechnoCom

11. WRSS request element (cont’d)
Month YearMarch 2005
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
Jason Liu and Justin McNew, TechnoCom

12. WRSS report element Defined as a new 802.11h measurement type:
Month YearMarch 2005
WRSS report element
Defined as a new h measurement type:
Name
Measurement Type
Basic report
Clear Channel Assessment (CCA) report 1
Receive power indication (RPI) histogram report 2
WRSS report 3
Jason Liu and Justin McNew, TechnoCom

13. WRSS report element (cont’d)
Month YearMarch 2005
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
Jason Liu and Justin McNew, TechnoCom

14. WRSS value mapping WRSS value in dBm -60 1 -59.8 2 -59.6 …… 149 -30.2
Month YearMarch 2005
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
-60 1
-59.8 2
-59.6 ……
149
-30.2
150
-30
151 ~ 255
reserved
Jason Liu and Justin McNew, TechnoCom

15. dot11WRSSCapabilityClass
Month YearMarch 2005
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.
Jason Liu and Justin McNew, TechnoCom