Enabling Procedure of Communication in TVWS under FCC rules Month Year doc.: IEEE 802.11-yy/xxxxr0 Enabling Procedure of Communication in TVWS under FCC rules Date: 2009-03-30 Authors: Name Company Address Phone email Chen Sun NICT 3-4, Hikarino-oka, Yokosuka, Kanagawa, Japan, 239-0847 +81 45 847 5062 sun@nict.go.jp Ha Nguyen Tran haguen@nict.go.jp Yohannes D. Alemseged yohannes@nict.go.jp Zhou Lan lan@nict.go.jp Hiroshi Harada harada@nict.go.jp 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. Chen SUN, NICT Chen SUN, NICT

Abstract This document presents the update of the enabling procedure presented in IEEE 802.11-10/261r1 and the proposed text to be incorporated in the base line document in section J2.4 of D0.01. Chen SUN, NICT

FCC regulations Before operation FCC15.13(e) Check with TVWS database (for fixed devices and Mode II master devices) FCC 16.711(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 15.711(c-4): In-service monitoring. A TVBD must perform in-service monitoring of an operating channel a minimum of once every 60 seconds. FCC 15.711(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 2 seconds. Chen SUN, NICT

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 15.711 (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 15.711 (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.

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 802.11 STAs to operate as dependent STAs in licensed spectrum. Procedure for making contact with enabling STA, obtaining a list of available channels as well as being under control by the enabling STA is performed in other frequency bands (cellular bands, public safety bands and unlicensed bands ). Procedures (before operation and during operation) shall to be added to follow FCC rules. Chen SUN, NICT

Proposed procedure-A for 802.11af The procedure is for a STA with backward compatibility to start communication in TVWS. It is assumed that the STA has finished the association and initialization in other frequencies (e.g., ISM band) but have not been enabled. 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. Chen SUN, NICT

Comparison of the state diagrams of the enabling procedure in 802 Comparison of the state diagrams of the enabling procedure in 802.11af and that in 802.11y Figure 1 DSE in 802.11y Figure 2 Proposed enablement procedure in 802.11af The red color indicates modifications on the DSE of 802.11y. Chen SUN, NICT

Proposed text to be added to J2.4 of the base line document D0.01 A dependent STA shall perform TV channel availability check after receiving an enabling message. The dependent STA is required to check for TV signals for a minimum time interval of 30 seconds (FCC CFR47 [B8], Sections 16.711). If the dependent STA detects signal in the frequency bands that are indicated as available channels by the initialization message, the dependent STA fails to enablement. Furthermore, if the there is an error from the spectrum measurement at the dependent STA, the dependent STA also fails to be enabled. The reasons for the error of the spectrum sensor could be a) the spectrum measurement is locked for exclusive use by other functions; b) the spectrum measurement doesn’t support the sensing in the particular TV band as given by the enabling message; c) unknown. If no signals are detected, the dependent STA becomes enabled. A dependent STA once become enabled shall perform in-service monitoring. In-service monitoring shall be performed for an operating channel a minimum of once every 60 seconds. (FCC CFR47 [B8], Sections 15.711). After a signal is detected on a TVWS operating channel, all transmissions in that channel shall cease within 2 seconds (FCC CFR47 [B8], Sections 15.711). Then, the dependent STA becomes unenabled. Chen SUN, NICT