Electronic Communications PART 1 Introductory Provisions Citation and Commencement 1 These Regulations may be cited as the Wireless Telegraphy (Mobile Repeater) (Exemption) Regulations 2022 and shall come into force on 16th June 2022. Revocation 2 The Wireless Telegraphy (Mobile Repeater) (Exemption) Regulations 2018 are hereby revoked. Interpretation 3 In these Regulations— a “ Act ” means the Wireless Telegraphy Act 2006; b “ coverage antenna ” means the antenna connected to a mobile repeater device which receives transmissions from mobile devices; c “ coverage port ” means the interface between a mobile repeater device and its coverage antenna; d “ dB ” means decibel; e “ dBm ” means decibels of power referenced to one milliWatt; f “ dBm/MHz ” means decibels of power referenced to one milliWatt per megahertz; g “ dBm/5 MHz ” means decibels of power referenced to one milliWatt per five megahertz; h “ donor antenna ” means the antenna connected to a mobile repeater device which receives transmissions from the base stations of mobile network operators; i “ donor port ” means the interface between a mobile repeater device and its donor antenna; j “ downlink frequencies ” means the frequency bands 758-788MHz, 791-821MHz, 925-960MHz, 1805-1880 MHz, and 2110-2170MHz; k “ ETSI ” means the European Telecommunications Standards Institute; l “e.i.r.p.” means equivalent isotropically radiated power, which is the product of the power supplied to an antenna and the absolute antenna gain in a given direction relative to an isotropic antenna; m “ GSM system ” means an electronic communications network that complies with standards EN 301 502 and EN 301 511 published by ETSI for the Global System for Mobile Communications (also known as GSM); n “ indoors ” means inside premises, which— i have a ceiling or a roof; and ii except for any doors, windows or passageways, are wholly enclosed; o “IR2102.2” means interface requirement “IR2102.2: Minimum requirements for the use of: low gain mobile phone repeaters for in-vehicle use” contained within the document entitled “UK Interface Requirement 2102 – Licence exempt mobile phone repeaters” published by OFCOM in February 2024 ; p “ LTE system ” means an electronic communications network that complies with standards EN 301 908-1 , EN 301 908-13 and EN 301 908-14 published by ETSI for the Long Term Evolution telecommunication system (also known as LTE); q “ MHz ” means megahertz; r “ mobile repeater device ” means a wireless telegraphy station or wireless telegraphy apparatus which amplifies the radio signals carried over frequencies licensed to one or more mobile network operators; s “ motor vehicle ” means a mechanically propelled vehicle intended or adapted for use on roads; t “ OFCOM ” means the Office of Communications; u “ power spectral density ” means, in respect of a particular frequency band or frequencies, the e.i.r.p. of the transmissions made by the mobile repeater device on that particular frequency band or frequencies (as applicable) with the average power per five MHz bandwidth centred on that frequency band or frequencies, radiated in the direction of the maximum level; v “ system gain ” means, in respect of a particular frequency band or frequencies, the difference between (i) the power received at the input antenna of the mobile repeater device in respect of that particular frequency band or those particular frequencies, and (ii) the power transmitted by the output antenna of the mobile repeater device in respect of that particular frequency band or those particular frequencies (which difference shall be expressed in dB); w “ UMTS system ” means an electronic communications network that complies with standards EN 301 908—1, 301 908—2 and EN 301 908—3 published by ETSI for the Universal Mobile Telecommunications System (also known as UMTS); x “ uplink frequencies ” means the frequency bands 703-733 MHz, 832-862 MHz, 880-915 MHz, 1710-1785 MHz and 1920-1980 MHz; y “ uplink noise power ” means the total amount of noise produced by a mobile repeater device in the relevant uplink frequencies, expressed in dBm/MHz; and z “ WiMAX system ” means an electronic communications network that complies with standards EN 301 908—1, EN 301 908—21 and EN 301 908—22 published by ETSI for the Worldwide Interoperability for Microwave Access telecommunication system (also known as WiMAX). PART 2 Mobile repeater devices for indoor use Scope of exemption for indoor use 4 The establishment, installation, or use of a mobile repeater device is exempt from the provisions of section 8(1) of the Act if— a that device complies with the terms, provisions, and limitations specified in regulations 5 to 12 ; or if b that device complies with the terms, provisions, and limitations specified in regulations 5 to 8 and regulations 14 to 17 . Terms, provisions and limitations for all mobile repeater devices Limitations on transmissions 5 1 The mobile repeater device must only be established, installed, and used where the transmissions it makes on downlink frequencies are made indoors. 2 The mobile repeater device may only amplify signals carried over the downlink frequencies and the uplink frequencies. Prohibition on undue interference 6 The establishment, installation, and use of the mobile repeater device must not cause or contribute to undue interference to other users of the electromagnetic spectrum. Anti-oscillation requirements 7 1 The mobile repeater device must— automatically detect any oscillations it makes; and use an anti-oscillation technique, in accordance with paragraphs (4) and (5) , where it detects any such oscillations. 2 Any oscillations in the uplink frequencies must be detected within 0.3 seconds. 3 Any oscillations in the downlink frequencies must be detected within one second. 4 Subject to paragraph (5) , if the mobile repeater device detects any oscillations, it must use an anti-oscillation technique which stops those oscillations and continues for at least one minute. 5 If an anti-oscillation technique has been used on five occasions in accordance with paragraph (4), and the mobile repeater device subsequently detects further oscillations, it must cease transmitting. 6 A mobile repeater device which has ceased transmitting in accordance with paragraph (5) must only resume operation if it has been manually reset. 7 For the purpose of this regulation, a mobile repeater device makes oscillations when the transmissions made by the mobile repeater device are received and subsequently re-amplified by that device, resulting in a fluctuation in the transmit power of that device (either in the frequency band being amplified or in another frequency band). System noise figure limit 8 1 The system noise emanating from the mobile repeater device shall not exceed a system noise figure of 7 dB. 2 For the purpose of this regulation— a “ system noise figure ” means the difference between (i) the noise power measured at the output port of the mobile repeater device, and (ii) the noise power which would be present at the output port of that device if the only source of noise from that device were thermal noise (which difference shall be expressed in dB); and b “ thermal noise ” means the noise power from a mobile repeater device due to the thermal agitation of charge carriers within that device at room temperature, which noise occurs even if the mobile repeater device is not amplifying any signals. Additional terms, provisions and limitations for provider-specific mobile repeater devices Frequencies to be amplified 9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic standby requirement 10 1 Where the mobile repeater device does not serve an active connection between a mobile device operating on the network of a particular mobile network operator and that particular mobile network for five minutes or more, it must ensure that any transmissions it makes on the uplink frequencies licensed to that mobile network operator comply with the limit in paragraph (2) . 2 The transmissions, when measured in any direction, must have an uplink noise power which does not exceed -70 dBm/MHz e.i.r.p. Power limits 11 The mobile repeater device may only emit transmissions on frequencies licensed to a mobile network operator which— a in the frequency band 703-733 MHz or 832-862 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have an e.i.r.p. no greater than 23 dBm; b in the frequency band 880-915 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have— i an e.i.r.p. where those transmissions are carried over a GSM system no greater than 33 dBm; ii an e.i.r.p. where those transmissions are carried over a UMTS system no greater than 24 dBm; and iii an e.i.r.p, where those transmissions are carried over a terrestrial electronic communications network that is not a GSM system or UMTS system, no greater than 23 dBm; c in the frequency band 1710-1785 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have— i an e.i.r.p. where those transmissions are carried over a GSM system no greater than 30 dBm; ii an e.i.r.p. where those transmissions are carried over a UMTS system no greater than 24 dBm; and iii an e.i.r.p. where those transmissions are carried over a terrestrial electronic communications network that is not a GSM system or UMTS system, no greater than 23 dBm; d in the frequency band 1920-1980 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have an e.i.r.p. no greater than 24 dBm; e in the frequency band 758-788 MHz or 791-821 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have— i an e.i.r.p. no greater than 17 dBm; and ii a power spectral density no greater than 10 dBm/5 MHz; f in the frequency band 925-960 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have— i an e.i.r.p. where those transmissions are carried over a GSM system no greater than 10 dBm; ii an e.i.r.p. where those transmissions are carried over a terrestrial electronic communications network that is not a GSM system, no greater than 17 dBm; and iii a power spectral density, where those transmissions are carried over a terrestrial electronic communications network that is not a GSM system, no greater than 10 dBm/5 MHz; g in the frequency band 1805-1880 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have— i an e.i.r.p. where those transmissions are carried over a GSM system no greater than 10 dBm; ii an e.i.r.p. where those transmissions are carried over a terrestrial electronic communications network that is not a GSM system, no greater than 17 dBm; and iii a power spectral density, where those transmissions are carried over a terrestrial electronic communications network that is not a GSM system, no greater than 10 dBm/5 MHz; and h in the frequency band 2110-2170 MHz, when measured in any direction and in respect of the frequencies licensed to that mobile network operator only, have— i an e.i.r.p. no greater than 17 dBm; and ii a power spectral density no greater than 10 dBm/5 MHz. System gain limits 12 1 Where the mobile repeater device emits transmissions on frequencies licensed to one mobile network operator only, the uplink and downlink system gain must not exceed the limit in paragraph (3) where the uplink and downlink system gain is measured for each of the frequency bands being transmitted. 2 Where the mobile repeater device emits transmissions on frequencies licensed to more than one mobile network operator within a particular frequency band, the uplink and downlink system gain must not exceed the limit in paragraph (3) where the uplink and downlink system gain is measured separately for the frequencies licensed to each mobile network operator within that band that are being transmitted. 3 The uplink and downlink system gain must not exceed whichever is the smaller of— 100 dB; and BSCL – 30 dB. 4 Where the mobile repeater device cannot determine the BSCL for a particular frequency band or for the frequencies licensed to a particular mobile network operator, it shall not make any transmissions on that frequency band or those frequencies (as applicable). 5 In this regulation, “ BSCL ” means base station coupling loss, which is the difference between (i) the power transmitted by the base station (which may be determined from the system information messages sent by that base station on its control channels) and (ii) the power received by the mobile repeater device from the base station (which difference shall be measured in dB). Additional terms, provisions and limitations for multi-operator mobile repeater devices Frequencies that must be amplified 13 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Automatic standby requirement 14 1 Where the mobile repeater device does not serve an active connection between a mobile device and a mobile network for five minutes or more, it must ensure that any transmissions it makes using the uplink frequencies comply with the limit in paragraph (2) . 2 The transmissions, when measured in any direction, must have an uplink noise power which does not exceed -70 dBm/MHz e.i.r.p. Limits on power spectral density 15 1 The mobile repeater device may only emit transmissions on uplink frequencies in a particular frequency band which, when measured in any direction, have a power spectral density no greater than 17 dBm/5 MHz. 2 The mobile repeater device may only emit transmissions on downlink frequencies in a particular frequency band which, when measured in any direction, have a power spectral density no greater than 10 dBm/5 MHz. System gain limits 16 1 When measured separately for each of the frequency bands being transmitted— a the uplink and downlink system gain must not exceed whichever is the smaller of— i 100 dB; and ii 10 dB – RSSI; and b the uplink and downlink system gain must be equal. 2 In this regulation, “ RSSI ” means received signal strength indicator, which is the total downlink signal power received at the donor port of the mobile repeater device, for all base stations in the frequency band being transmitted (and which shall be measured in dBm). Limit on transmitted intermodulation products 17 1 For each frequency band that is being transmitted by the mobile repeater device, the power level of transmitted intermodulation products due to input signals within that frequency band shall not exceed −19dBm at the donor port and coverage port of that device. 2 In this regulation, “transmitted intermodulation products” due to input signals within a frequency band means any signals transmitted by the mobile repeater device within that frequency band which have been created from the non-linear combination of two or more input signals within that frequency band. PART 3 Mobile repeater devices for use in a motor vehicle Scope of exemption for use in a motor vehicle 18 1 The establishment, installation and use of a mobile repeater device is also exempt from the provisions of section 8(1) of the Act where the terms, provisions, and limitations in this regulation are met. 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 The establishment, installation, and use of the mobile repeater device must comply with IR2102.2. 4 The mobile repeater device must only be established, installed, and used in a motor vehicle. 5 The establishment, installation, and use must not cause or contribute to any undue interference to any wireless telegraphy. Helen Hearn Group Director of Spectrum Office of Communications 26th May 2022