1. Channel list request/response for multiple geo-locations
Nov 2010
doc.: IEEE af-10/1234r0
Nov 2010
Channel list request/response for multiple geo-locations
Date:
Authors:
Channel list request/response for multiple geo-locations
Date:
Author(s):
Name
Company
Address
Phone
Yohannes D. Alemseged
NICT
3-4, Hikarino-oka, Yokosuka, Kanagawa, Japan,
Chen Sun
Zhou Lan
Ha Nguyen Tran
Chin Sean Sum
Junyi Wang
Tuncer Baykas
Hiroshi Harada
Yohannes Alemseged, NICT
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Yohannes Alemseged, NICT

2. Nov 2010
Summary
Comment (CID 8, Page 8.19, Clause 11.af1.1) as given in 595r14: It is required by the FCC that a TV Band Device requests and receives a list of available TV channels from an authorized database using its geolocation coordinates. The statement must be normative.
Suggestion: Change the text to read, "An enabling STA shall be capable of identifying its geographic location and shall access a TV bands database system.“
Resolution: Agree in principle, however the provided solution is not sufficient as it doesn’t include to address capabilities of submitting multiple geolocations in the vicinity of the current geolocation to obtain channel list applicable to multiple geolocation.
This document provides a proposal to adapt the ongoing af project to include the multiple geo-location channel loading capability as specified in the FCC document
Yohannes Alemseged, NICT

3. Discussion: What is stated in the rule
Nov 2010
Discussion: What is stated in the rule
A Mode II personal/portable device may load channel availability information for multiple locations around, i.e., in the vicinity of, its current location and use that information in its operation. A Mode II TVBD may use such available channel information to define a geographic area within which it can operate on the same available channels at all locations, for example a Mode II TVBD could calculate a bounded area in which a channel or channels are available at all locations within the area and operate on a mobile basis within that area. Appendix B Final Rule, Page 75
Yohannes Alemseged, NICT

4. How to do it Nov 2010 Identify the current geo-location
Select multiple geo-locations in the vicinity of the current geo-location (a range that includes multiple geo-locations)
Provide the multiple geo-location including the current geo-location to the database
Obtain channel list tagged to each geo-location submitted
Define an operating geographic area in which overlapping available channel lists are found and store the operating geographic region along with the overlapping channel lists.
Use the overlapping channels along with the stored operating geographic area during operation with in the bound of the operating geographic area without querying the database at most until the 24hr database access requirement expires
The device should re-recheck its position every 60s and if the location is detected to be outside the stored boundary of the operating geographic area, the device must contact the database to obtain a valid channel list for that area.
Yohannes Alemseged, NICT

5. How to determine vicinity geo-locations around the current location
Nov 2010
How to determine vicinity geo-locations around the current location A
200m B I C D E F G H
Illustrative example I
Location A is the current location of the Mode II TVBD
Locations B,C,D,E,F,G,H,,I are selected in such a way that the required operating geographic area is obtained, illustration is based on Cartesian coordinate.
Geolocation information in af is provided in LCI
This approaches may require higher overhead since each LCI requires 16 octet
Yohannes Alemseged, NICT

6. Defining operating geographic area based on overlapping channels1 3 5 2 8 D 4
After receiving the channel list for each geo-location, identify the neighboring geo-locations that result in overlapping channels
Region one: A,B,C,D,E,F,G,H,I (channel 1, 3)
Region two: A, E, D, I (channel 1,3,4)

7. How to determine vicinity geo-locations around the current location
Nov 2010
How to determine vicinity geo-locations around the current location
Illustrative example II
Location A is the current location and it is specified by LCI as with in +-50 resolution
Location B is the vicinity geo- location around location A (including location A)
Two location information is required. One for the current Geo-location information and the second geo-location with similar content like the current geo-location but with a higher resolution
We use this approach to include the Multiple geo-location channel list since it requires less overhead
A: current geo-location
B: vicinity geo-location
Yohannes Alemseged, NICT

8. Scenarios for using multiple geo-location channel loading
Nov 2010
Scenarios for using multiple geo-location channel loading
Mode II device
Database
Mode II/Fixed device
Direct access to database
Indirect access to database
Yohannes Alemseged, NICT

9. Nov 2010
Proposal to incorporate in af the multi geo-location channel list request /response capability
Request database for multiple geo-location channel list availability
Multiple geo-location channel list management information element
Multiple Locations Channel List Management Information element format
Information fields
Current Geo-Location: refers to the geo-location of the STA represented by LCI with in accuracy of +-50 meter as specified in the resolution bits of the LCI.
WSM1: refers to the available channel list valid for the current geo-location specified
Vicinity Geo-Location: refers to the geo-location of the STA around the current geo-location of the STA. It is represented by LCI with in accuracy of less than +-50 meter
WSM2: refers to the available channel list valid for the vicinity geo-location specified
Length: length of remaining field in octets, depends on WSM1 and WSM2
Element ID
Length
Current geo-location
WSM1
Vicinity geo-location
WSM2
Octets 1 16
variable
Yohannes Alemseged, NICT