1. Enabling Procedure of Communication in TVWS under FCC rules
Month Year
doc.: IEEE yy/xxxxr0
Enabling Procedure of Communication in TVWS under FCC rules
Date:
Authors:
Name
Company
Address
Phone
Chen Sun
NICT
3-4, Hikarino-oka, Yokosuka, Kanagawa, Japan,
Ha Nguyen Tran
Yohannes D. Alemseged
Zhou Lan
Hiroshi Harada
Notice: This document has been prepared to assist IEEE 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.
Chen SUN, NICT
Chen SUN, NICT

2. Abstract
By drawing an analogy between y STAs and FCC devices, we can see that DSE in y should be modified to enable communication in TVWS for af.
Two procedures are proposed (additional steps are added to DSE) to satisfy the FCC regulation.
The proposed procedures are intended for personal/portable devices and fixed station both without geolocation/access to database.
Procedure A is for STAs with backward compatibility to satisfy FCC rules.
Procedure B is for STAs without backward compatibility. It enables communication not only to satisfy mandatory FCC rules but also to have additional benefits such as better incumbent user protection, reduced transmit power, etc.
Chen SUN, NICT

3. Analogy of devices in 802.11y and FCC regulation
Registered STA
Fixed STA
Enabling STA
Unregistered STA
Dependent STA
FCC
Having geolocation capability and access to database
Fixed device (<4w)
personal/portable devices in Mode-II (<100mw)
No geolocation capability/access to database
Mode-I devices (<100mw) and sensing only devices (<50mw)
Fixed TVBD device does not have a direct connection to the Internet and has not yet been initialized and registered with the TV bands database (fixed-client).
Chen SUN, NICT

4. FCC regulations Before operation
FCC15.13(e) Check with TVWS database (for fixed devices and Mode II master devices)
FCC (C-3): TV channel availability check time. A TVBD is required to check for TV signals for a minimum time interval of 30 seconds.
During operation
FCC (c-4): In-service monitoring. A TVBD must perform in-service monitoring of an operating channel a minimum of once every 60 seconds.
FCC (c-5): Channel move time. After a wireless microphone or other low power auxiliary device signal is detected on a TVBD operating channel, all transmissions by the TVBD must cease within two seconds.
Chen SUN, NICT

5. FCC rules regarding to Mode I devices
FCC: Mode I - client, whereby a personal/portable device is controlled by a fixed or a personal/portable device operating in Mode II that has determined the available channels in the area. A device in client mode is not able to initiate a network.
FCC paragraph 133: We envision that both the Mode I and Mode II approaches will often be incorporated into the same personal/portable device. That is, a personal/portable device could function as a master device when it is able to use geolocation/sensing and database access to identify unused TV channels in its area. If it cannot rely on these techniques but is near a fixed device or another personal/portable device that can act as a master, it could operate in client mode if it makes contact with a master station.
FCC (b-3-iv): Personal/portable devices operating in Mode I shall obtain a list of channels on which they may operate from a master device.
FCC (g): A personal/portable TVBD operating in Mode I may only transmit upon receiving the transmissions of fixed or Mode II TVBD. A personal/portable device operating in Mode I may transmit on either an operating channel of the fixed or Mode II TVBD or on a channel the fixed or Mode II TVBD indicates is available for use.

6. DSE in 802.11y and necessary modifications
The DSE operating procedures are used to automate the channel permissioning and regulatory controls needed for unregistered IEEE STAs to operate as dependent STAs in licensed spectrum.
Spectrum sensing steeps (before operation and during operation) shall to be added to follow FCC rules.
Procedure for making contact with enabling STA, obtaining a list of available channels as well as being under control by the enabling STA should be added.
Transmit power control should be added to follow FCC rules.
Chen SUN, NICT

7. Proposed procedure-A for 802.11af
For this approach, the STA shall obtain a list of available channels and shall become being under control of the enabling STA (Mode II device) after receiving the enabling beacon.
This situation assumes that the STA has been associated in other frequencies (ISM band), initialized but not enabled.
The procedure is useful to a STA with backward compatibility to start communication in TVWS.
Chen SUN, NICT

8. Comparison of the state diagrams of enabling procedure in 802
Comparison of the state diagrams of enabling procedure in af and that in y
Figure 1 DSE in y
Figure 2 Proposed enablement procedure in af
The red color indicates modifications on the DSE of y.
Chen SUN, NICT

9. Proposed procedure-B for 802.11af
This situation assumes that the STA has not been associated/initialized.
Power control is added to state (9) to start communication with a relatively lower power.
Since the STA has performed sensing and is not yet under control of the enabling STA and haven’t contacted the enabling STA, it can operate as a sensing-only device.
In stage (9), the STA (as a sensing-only device) can make contact with the enabling STA and obtain a list of available channels.
If the STA is under control of the enabling STA, the STA can operate as a Mode I device.
The procedure is useful to a STA without backward compatibility to start communication in TVWS.
The additional power control procedure reduces possibility of interfering primary users and power consumption.
Chen SUN, NICT

10. Comparison of the state diagrams of enabling procedure in 802
Comparison of the state diagrams of enabling procedure in af and that in y
Figure 1 DSE in y
Figure 2 Proposed procedure in af
The red color indicates modifications on the DSE of y.
Chen SUN, NICT

11. Conclusion
Two procedures for starting communication in af are given.
The proposed procedures modify the DSE in y for the operation to follow FCC mandatory rules.
Additional steps (such as spectrum sensing, transmit power control) are included to satisfy the regulations set by FCC.
Procedure A assumes a STA obtains a list of available channels and become being under control by an enabling STA. It is useful for STA with backward compatibility.
Procedure B adds an additional low power transmission (as in sensing-only mode) state a STA to contact an enabling STA to obtain the list of available channels and become being control by the enabling STA. It is useful for STA without backward compatibility. The procedure also gives benefits such as reduced possibility of interfering the incumbent users and reduced power consumption.
The proposed procedures are useful to TV band devices with no geolocation/database access capabilities.
The procedures facilitate manufacturers to produce low-cost commercial 802 products (no geolocation/database access).
Chen SUN, NICT