1. The WS device requirements in ETSI EN 301 598 Cesar Gutierrez, Ofcom UK 9 th December 2013 Project Team FM53 FM53(13)58 5 th meeting,17-18 December 2013 ANFR,Maisons-Alfort (France) ECC Electronic Communications Committee CEPT

2. 1 ETSI EN 301 598 - White Space Devices (WSD); Wireless Access Systems operating in the 470 MHz to 790 MHz frequency band; Harmonized EN covering the essential requirements of article 3.2 of the R&TTE Directive A candidate Harmonised Standard produced by ETSI committee BRAN under Mandates M/284 and M/512 It contains the technical requirements that ETSI BRAN has deemed essential for the avoidance of harmful interference – RF characteristics; – Data exchange with databases; – Database discovery It was approved by ETSI BRAN in June 2013 and sent for Public Enquiry. The group is now dealing with the comments received – which are numerous but not substantial

3. Overview of the data exchange and the control functions 1) Database discovery 2) Parameter exchange List of qualifying WSDBs TV band Slave WSD 3) WSD update Master WSD White space database 1)NRAs will make available the list of the WSDB qualified to operate in their regulatory domain. Devices may only get parameters from WSDBs in the list 2)Devices will send their characteristics, including location, to a qualifying WSDB. The WSDB will in return provide location-specific information on maximum permitted device powers in each DTT channel 3)A WSDB must be able to rapidly reduce the power of individual devices

4. 3 Data exchange Master DPs DP: device parameters, these are the technical characteristics and location of the device SOP: specific operational parameter, The permitted frequencies and powers for a specific WSD GOP: generic operational parameter, These parameters can be used by any slave in the coverage area of the serving master WSD CUP: channel usage parameter, Actual frequencies and powers that the device will use Master SOPs Master CUPs Slave GOPs Slave DPs/CUPs Slave SOPs Slave CUPs WSDB Master WSD Slave WSD EN 301 598 assumes a sequence of data exchanges between the WSDB, the master WSD and a slave WSD

5. 4 Data exchange requirements The EN 301 598 is not prescriptive about the sequence, or about the name and format of the parameters The requirements are about what parameters a device is allowed to use, and what parameters it must communicate to the WSDB (or to the master WSD in case of a slave WSD). In summary: –A WSD shall only transmit in accordance with operational parameters that it has received from a WSDB. –A master or a slave WSD that require specific operational parameters from a WSDB must report their device parameters to the WSDB. –A slave WSD that intends to use the generic operational parameters broadcasted by a master must report its unique device identifier –If a WSD intends to transmit at a total EIRP which exceeds 0 dBm, then it shall communicate its channel usage parameters to the WSDB We plan to amend this to require that a master WSD always reports its channel usage parameters (independently of its transmit power)

6. A master WSD must support the WSD update function: –A master WSD shall cease transmission, and shall instruct the slaves attached to it to cease transmission, if it receives update from the WSDB that the operational parameters are no longer valid –A master must be able to get an update within T Update The value of T Update is one of the operational parameters and will be set by Ofcom. –A master must support a T value of 60 seconds or higher A slave shall cease transmission within five seconds of discovering that it can no longer receive updates from its serving master WSD The EN 301 598 also specifies the behaviour when in “sleep” mode WSD update A NRA needs the capability to switch off a device within a short time for interference management purposes. EN 301 598 specifies requirements for this

7. RF power, RF power spectral density and multi-channel operation The device shall not exceed the EIRP and EIRP spectral density levels communicated by the WSDB for each DTT channel. A WSD which transmits simultaneously over multiple DTT channels must –comply with the maximum permitted in-block EIRP spectral densities in each of the DTT channels to be used; and –radiate with a total EIRP which does not exceed the smallest of the maximum permitted in-block EIRPs specified over each of the DTT channels to be used.

8. Out-of-block emissions in the UHF band The out-of-block EIRP spectral density, P OOB, of a WSD must satisfy where P IB is the WSD’s in-block EIRP spectral density, and AFLR is the WSD’s adjacent frequency leakage ratio outlined in the table below for different device emission classes. Each out-of-block EIRP spectral density is examined in relation to P IB in the nearest (in frequency) DTT channel used by the WSD. The absolute value of  84 dBm/(100 kHz) is specified to account for the difficulty in maintaining a high leakage ratio at very low in-block EIRPs. Where P OOB falls within the nth adjacent DTT channel (based on 8 MHz wide channels) AFLR (dB) Class 1Class 2Class 3Class 4Class 5 n = ±174 645443 n = ±27974 6453 n ≥ +3 or n ≤ -38474847464

9. 8 Other RF requirements Transmitter unwanted emissions outside the 470 MHz to 790 MHz band –The requirement is in line with the ETSI standards applicable to other types of equipment Transmitter Reverse Intermodulation –This requirement put a limit on the generation of signals caused by the presence of the transmitter wanted signal and an unwanted signal (interferer) reaching the transmitter via the antenna Receiver spurious emissions –These are unwanted RF emissions from a WSD at any frequency when the equipment is in receive mode –The limits are in line with other ETSI standards

10. 9 Equipment type A A Type A WSD is a device that is intended for fixed use only. This type of equipment can have integral, dedicated or external antennas. A base station or a smart meter are likely to be type A devices Equipment types Important definitions: Dedicated antenna: removable antenna supplied and assessed with the equipment, designed as an indispensable part of the equipment Integral antenna: antenna designed as a fixed part of the equipment and that cannot be disconnected from the equipment by a user with the intent to connect another antenna External antenna: removable antenna which is designed for use with a broad range of radio equipment and has not be designed for use with a specific product Equipment type B A Type B WSD is a device that is not intended for fixed use and which has an integral antenna or a dedicated antenna. A handheld or a laptop will be type B device

11. Geo-location requirements EN 301 598 defines Geo-location capability as the capability of a WSD to determine and report its horizontal and vertical coordinates A Type B WSD that has geo-location capability shall check its location at least every 60 seconds. A WSD, whose location is more than L Val away from the location reported to the TVWSDB, shall not transmit according to the operational parameters for the reported location –L Val is one of operational parameters. Ofcom will set this value initially to 50 metres A WSD which had previously reported a location to the TVWSDB but it is no longer able to determine its location shall stop transmitting in accordance with the existing operational parameters

12. Software, Firmware and User Access Restrictions The equipment shall not allow the user to have access to hardware or software settings that relate to the exchange of the parameters. The equipment shall not accept the installation of software which can change the compliance with the requirements of EN 301 598 Manufacturers who provide their software or firmware as open source code shall prevent modified software from having any impact on the compliance with the requirements of EN 301 598 The configuration of equipment shall not be made dependent of the correct selection by the user of the appropriate country of operation, or any other setting to be input by the end user The purpose of these requirements is that the end user must not access or configure the radio parameters

13. Security Authentication A master WSD must authenticate – the web server providing the list of qualifying WSDBs –The WSDB server using a widely accepted Internet authentication mechanism. It must not exchange parameters with a server WSDB ythat has not been authenticated Security of the communications A master WSD shall communicate with the WSDB using a protocol that includes functionality to avoid tampering with the exchange of parameters in transit. A master WSD and a slave WSD must communicate using a protocol that includes functionality to avoid corruption of the parameters in transit We expect devices and databases to communicate using protocols that implement security according to best industry practices The requirements in ETSI EN 301 598 are high level –ETSI BRAN did not want to mandate specific protocols or technologies

14. Discovery of qualifying databases in the UK When operating in the UK, a master WSD must discover active qualifying WSDBs by consulting a device-readable list provided by Ofcom at https://TVWS-DB.ofcom.org.uk https://TVWS-DB.ofcom.org.uk The list will contain information about the WSDBs including their web addresses. It will also tell the device how often it must re-consult the list (the N parameter) The protocol to access the list will be HTTPS –The master WSD must issue an HTTP GET request, including its Unique ID as a parameter –The server will respond with an XML file The master WSD must authenticate the list server before using the list Ofcom has published the format of the GET request and of the XML file https://TVWS-DB.ofcom.org.uk HTTPS GET?