PL2294771T3 - Wzór i rozkład przeskoków częstotliwości dla referencyjnego sygnału sondującego - Google Patents

Wzór i rozkład przeskoków częstotliwości dla referencyjnego sygnału sondującego

Info

Publication number
PL2294771T3
PL2294771T3 PL09722793T PL09722793T PL2294771T3 PL 2294771 T3 PL2294771 T3 PL 2294771T3 PL 09722793 T PL09722793 T PL 09722793T PL 09722793 T PL09722793 T PL 09722793T PL 2294771 T3 PL2294771 T3 PL 2294771T3
Authority
PL
Poland
Prior art keywords
arrangement
reference signal
frequency hopping
sounding reference
hopping pattern
Prior art date
Application number
PL09722793T
Other languages
English (en)
Inventor
Kari Juhani Hooli
Kari Pekka Pajukoski
Esa Tapani Tiirola
Original Assignee
Nokia Solutions & Networks Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nokia Solutions & Networks Oy filed Critical Nokia Solutions & Networks Oy
Publication of PL2294771T3 publication Critical patent/PL2294771T3/pl

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/713—Spread spectrum techniques using frequency hopping
    • H04B1/7143—Arrangements for generation of hop patterns
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT
    • H04L5/0012—Hopping in multicarrier systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)
PL09722793T 2008-03-20 2009-03-19 Wzór i rozkład przeskoków częstotliwości dla referencyjnego sygnału sondującego PL2294771T3 (pl)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US6469008P 2008-03-20 2008-03-20
US7129908P 2008-04-21 2008-04-21
US7183708P 2008-05-20 2008-05-20
EP09722793.8A EP2294771B1 (en) 2008-03-20 2009-03-19 Frequency hopping pattern and arrangement for sounding reference signal
PCT/EP2009/053223 WO2009115563A1 (en) 2008-03-20 2009-03-19 Frequency hopping pattern and arrangement for sounding reference signal

Publications (1)

Publication Number Publication Date
PL2294771T3 true PL2294771T3 (pl) 2013-11-29

Family

ID=40802525

Family Applications (1)

Application Number Title Priority Date Filing Date
PL09722793T PL2294771T3 (pl) 2008-03-20 2009-03-19 Wzór i rozkład przeskoków częstotliwości dla referencyjnego sygnału sondującego

Country Status (15)

Country Link
US (2) US8537876B2 (pl)
EP (1) EP2294771B1 (pl)
JP (1) JP5297520B2 (pl)
KR (1) KR101250896B1 (pl)
CN (1) CN101978664B (pl)
AU (1) AU2009227004B2 (pl)
BR (1) BRPI0907858A2 (pl)
CA (1) CA2713202C (pl)
DK (1) DK2294771T3 (pl)
ES (1) ES2428914T3 (pl)
MX (1) MX2010010224A (pl)
PL (1) PL2294771T3 (pl)
RU (1) RU2485708C9 (pl)
WO (1) WO2009115563A1 (pl)
ZA (1) ZA201005378B (pl)

Families Citing this family (97)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB0708345D0 (en) * 2007-04-30 2007-06-06 Nokia Siemens Networks Oy Signalling within a communication system
PL2129181T3 (pl) 2007-06-08 2012-12-31 Sharp Kk System komunikacji ruchomej, urządzenie stacji bazowej oraz urządzenie stacji ruchomej
ES2847826T3 (es) 2007-09-06 2021-08-04 Sharp Kk Aparato de comunicación y método de comunicación
EP3496492B1 (en) 2008-03-19 2020-04-22 NEC Corporation Wireless communication system, wireless communication setting method, base station, mobile station, and program
PL2294771T3 (pl) 2008-03-20 2013-11-29 Nokia Solutions & Networks Oy Wzór i rozkład przeskoków częstotliwości dla referencyjnego sygnału sondującego
US8238405B2 (en) * 2009-03-31 2012-08-07 Mitsubishi Electric Research Laboratories, Inc. Antenna selection with frequency-hopped sounding reference signals
US9025471B2 (en) * 2008-05-07 2015-05-05 Mitsubishi Electric Research Laboratories, Inc. Antenna selection with frequency-hopped sounding reference signals
KR101021803B1 (ko) * 2008-06-23 2011-03-22 가부시키가이샤 엔티티 도코모 기지국장치와 유저장치 및 통신제어방법
US8913551B2 (en) * 2008-06-24 2014-12-16 Mitsubishi Electric Research Laboratories, Inc. Antenna selection with frequency-hopped sounding reference signals
CN101615928B (zh) * 2008-06-25 2016-05-18 三星电子株式会社 Lte系统中传输srs信令的方法和装置
CN101330325B (zh) * 2008-07-29 2012-09-05 中兴通讯股份有限公司 一种上行信道测量参考信号的传输方法
CN101651469B (zh) 2008-08-15 2013-07-24 三星电子株式会社 用于lte系统中发送上行监测参考符号的跳频方法
CN101378595B (zh) * 2008-09-28 2012-05-23 中兴通讯股份有限公司 确定随机接入信道数量的方法及测量参考信号的发送方法
KR101306735B1 (ko) * 2008-10-15 2013-09-11 엘지전자 주식회사 복수개의 안테나를 이용한 사운딩 기준 신호 시퀀스 전송 방법
EP3609201B1 (en) * 2008-11-06 2024-02-07 Wireless Future Technologies Inc. Wireless device location services
US8228862B2 (en) * 2008-12-03 2012-07-24 Samsung Electronics Co., Ltd. Method and system for reference signal pattern design
KR101674940B1 (ko) 2009-01-29 2016-11-10 엘지전자 주식회사 전송 전력을 제어하는 방법 및 이를 위한 장치
US8824584B2 (en) 2009-02-24 2014-09-02 Lg Electronics Inc. Method for transmitting sounding reference signal in MIMO wireless communication system and apparatus therefor
AR075865A1 (es) 2009-03-17 2011-05-04 Interdigital Patent Holdings Metodo y aparato para control de potencia de transmision de senal de referencia de sonido (srs)
CN106850023B (zh) * 2009-03-22 2020-09-15 Lg电子株式会社 使用多个天线的信道探测方法以及用于其的装置
US9019906B2 (en) 2009-04-10 2015-04-28 Panasonic Intellectual Property Corporation Of America Wireless base station apparatus, wireless terminal apparatus, frequency resource allocation method, and method of forming transmission signal
US8867414B2 (en) * 2009-04-27 2014-10-21 Qualcomm Incorporated Method and apparatus for interaction of cell-specific and user-equipment-specific sounding reference signal periodicity and offset
JP5411351B2 (ja) 2009-04-27 2014-02-12 テレフオンアクチーボラゲット エル エム エリクソン(パブル) ワイヤレス通信システムにおける方法および装置
KR101318920B1 (ko) * 2009-05-08 2013-10-17 노키아 지멘스 네트웍스 오와이 자원 할당을 위한 프로그램을 구현하는 방법, 장치 및 컴퓨터 판독가능 매체
KR101741397B1 (ko) * 2009-05-15 2017-06-08 엘지전자 주식회사 무선 통신 시스템에서 사운딩 참조 신호 송신 방법 및 이를 위한 장치
US8320267B2 (en) * 2009-06-23 2012-11-27 Motorola Mobility Llc Reference signal sounding for uplink pilot time slot in wireless communication system
US8782482B2 (en) * 2009-07-14 2014-07-15 Intel Corporation Method and system to improve link budget of a wireless system
CN101695191B (zh) * 2009-09-29 2014-04-09 中兴通讯股份有限公司 一种分配测量参考信号资源的系统及方法
US8768397B2 (en) 2009-10-02 2014-07-01 Sharp Kabushiki Kaisha Transmission power control on a wireless communication device for a plurality of regulated bands or component carriers
US9059749B2 (en) 2009-10-02 2015-06-16 Sharp Kabushiki Kaisha Antenna port mode and transmission mode transitions
US8300588B2 (en) * 2009-10-05 2012-10-30 Futurewei Technologies, Inc. System and method for user equipment measurement timing in a relay cell
JP5520003B2 (ja) * 2009-10-28 2014-06-11 シャープ株式会社 無線通信システム、基地局装置、移動局装置、無線通信システムの制御方法、基地局装置の制御プログラムおよび移動局装置の制御プログラム
US9531514B2 (en) * 2009-12-03 2016-12-27 Qualcomm Incorporated Sounding reference signal enhancements for wireless communication
WO2011086920A1 (ja) * 2010-01-14 2011-07-21 パナソニック株式会社 無線通信端末装置、無線通信基地局装置及び無線通信方法
US8848520B2 (en) * 2010-02-10 2014-09-30 Qualcomm Incorporated Aperiodic sounding reference signal transmission method and apparatus
KR101328213B1 (ko) 2010-02-12 2013-11-14 엘지전자 주식회사 무선 통신 시스템에서 데이터 전송 방법 및 장치
KR101791266B1 (ko) * 2010-02-12 2017-10-30 엘지전자 주식회사 무선 통신 시스템에서 데이터 전송 방법 및 장치
CN101835159A (zh) * 2010-03-29 2010-09-15 普天信息技术研究院有限公司 一种跳频用户和非跳频用户的频域复用方法和系统
US8611442B2 (en) 2010-04-06 2013-12-17 Motorola Mobility Llc Method and apparatus for channel sounding in an orthogonal frequency division multiplexing communication system
RU2536346C2 (ru) * 2010-04-30 2014-12-20 Нокиа Сименс Нетуоркс Ой Поддержка обратной сигнализации подтверждения приема/отрицательного подтверждения приема по восходящей линии для агрегирования несущих в течение периода (ре) конфигурирования(активации)деактивации компонентных несущих с неопределенностью синхронизации
CN102281642B (zh) 2010-06-10 2015-12-16 中兴通讯股份有限公司 一种lte系统中srs资源分配方法和装置
EP2647237B1 (en) * 2010-06-15 2017-12-06 Huawei Technologies Co., Ltd. Method and apparatus of wireless communications
TW201215025A (en) * 2010-08-12 2012-04-01 Innovative Sonic Corp Method of transmitting Acknowledgement/Negative-Acknowledgement and periodic channel status reporting and communication device
WO2012039571A2 (en) * 2010-09-20 2012-03-29 Lg Electronics Inc. Method and user equipment for transmitting uplink control information
WO2012054699A1 (en) * 2010-10-22 2012-04-26 Mediatek Singapore Pte. Ltd. Simultaneous feedback signaling for dynamic bandwidth selection
WO2013006379A1 (en) 2011-07-01 2013-01-10 Dinan Esmael Hejazi Synchronization signal and control messages in multicarrier ofdm
US8582527B2 (en) * 2011-07-01 2013-11-12 Ofinno Technologies, Llc Hybrid automatic repeat request in multicarrier systems
US8369280B2 (en) 2011-07-01 2013-02-05 Ofinno Techologies, LLC Control channels in multicarrier OFDM transmission
WO2013049962A1 (en) * 2011-10-08 2013-04-11 Huawei Technologies Co., Ltd. Sounding reference signal transmission
KR20140097107A (ko) 2011-11-01 2014-08-06 엘지전자 주식회사 무선통신 시스템에서 단말의 사운딩 참조신호 전송 결정 방법 및 이를 위한 단말
US8842637B2 (en) 2011-12-04 2014-09-23 Ofinno Technologies, Llc Carrier information transmission to wireless devices
KR20130087957A (ko) * 2012-01-30 2013-08-07 삼성전자주식회사 협력 통신 시스템에서 사운딩 레퍼런스 신호의 전송 방법 및 장치
US9497756B2 (en) 2012-03-25 2016-11-15 Comcast Cable Communications, Llc Base station radio resource management
US9949265B2 (en) 2012-05-04 2018-04-17 Comcast Cable Communications, Llc Control channel in a wireless communication system
CN103517344B (zh) * 2012-06-20 2016-06-29 普天信息技术研究院有限公司 上行侦听参考信号的传输方法
FR2995115B1 (fr) * 2012-09-04 2014-09-05 Sigfox Procedes d'emission et de reception de donnees dans un systeme de telecommunications numeriques
EP2904830A4 (en) * 2012-10-05 2016-05-18 Sierra Wireless Inc EXPANSION FOR LTE COMMUNICATION SYSTEMS
CN104283581B (zh) 2013-07-01 2019-01-15 中兴通讯股份有限公司 一种确定探测参考信号跳频图案的方法及系统
WO2015066645A1 (en) * 2013-11-01 2015-05-07 Samsung Electronics Co., Ltd. Methods and apparatus for enhanced coverage transmission for lte advanced
KR101611825B1 (ko) 2013-11-08 2016-04-14 주식회사 케이티 상향링크 전송 전력을 제어하는 방법과 그 장치
US10862634B2 (en) 2014-03-07 2020-12-08 Huawei Technologies Co., Ltd. Systems and methods for OFDM with flexible sub-carrier spacing and symbol duration
WO2015156495A1 (ko) * 2014-04-09 2015-10-15 엘지전자 주식회사 사운딩 절차 기반의 프레임 전송 방법 및 장치
EP3140944B1 (en) * 2014-05-08 2021-06-23 Nokia Solutions and Networks Oy Improving communication efficiency
WO2016028103A1 (ko) * 2014-08-20 2016-02-25 엘지전자 주식회사 무선 통신 시스템에서 신호 전송 방법 및 장치
US9585102B2 (en) * 2014-09-26 2017-02-28 Kt Corporation Method of controlling the transmission power of uplink channels and signals and apparatuses thereof
EP3249961B1 (en) * 2015-02-17 2020-11-11 Huawei Technologies Co., Ltd. Uplink reference signal communication device and method
WO2016144076A1 (en) 2015-03-06 2016-09-15 Lg Electronics Inc. Method and apparatus for configuring frame structure and frequency hopping for mtc ue in wireless communication system
CN106162906B (zh) 2015-03-31 2019-01-15 中兴通讯股份有限公司 调度信息发送、接收方法及装置
WO2016165123A1 (en) * 2015-04-17 2016-10-20 Mediatek Singapore Pte. Ltd. Enhancement for harq with channel repetitions
EP3294024B1 (en) 2015-06-03 2022-09-28 Huawei Technologies Co., Ltd. Method and device for configuration of frequency domain resources
WO2017019003A1 (en) * 2015-07-24 2017-02-02 Halliburton Energy Services, Inc. Frequency hopping sounder signal for channel mapping and equalizer initialization
EP3751745B1 (en) * 2016-01-29 2022-04-27 Telefonaktiebolaget LM Ericsson (publ) Frequency hopping for random access
WO2017135773A1 (ko) * 2016-02-05 2017-08-10 엘지전자 주식회사 무선 통신 시스템에서 사운딩 참조 신호를 전송하는 방법 및 이를 지원하는 장치
WO2017179859A1 (ko) * 2016-04-10 2017-10-19 엘지전자 주식회사 무선 통신 시스템에서 상향링크 참조 신호를 전송하는 방법 및 장치
WO2018019365A1 (en) * 2016-07-26 2018-02-01 Sony Mobile Communications Inc. Frequency hop based positioning measurement
DE102016220882A1 (de) 2016-10-24 2018-04-26 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Optimierte Sprungmuster für verschiedene Sensorknoten und variable Datenlängen auf Basis des Telegram Splitting Übertragungsverfahrens
DE102016220883A1 (de) 2016-10-24 2018-04-26 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Optimierte Kombination aus Präambel und Datenfeldern für Sensornetzwerke mit geringem Stromverbrauch auf Basis des Telegram Splitting Verfahrens
WO2018132945A1 (zh) * 2017-01-17 2018-07-26 广东欧珀移动通信有限公司 传输探测参考信号的方法、终端设备和网络设备
US11910388B2 (en) * 2017-03-24 2024-02-20 Qualcomm Incorporated Uplink control channel configuration for wireless communications
DE102017206236A1 (de) 2017-04-11 2018-10-11 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Spezifische hoppingmuster für telegram-splitting
JP6864095B2 (ja) 2017-04-27 2021-04-21 エルジー エレクトロニクス インコーポレイティド Srsを送信する方法及びそのための端末
CN108111279B (zh) * 2017-08-21 2022-06-03 中兴通讯股份有限公司 参考信号传输、参数发送方法及装置、终端、基站
US10659100B2 (en) * 2017-09-22 2020-05-19 Texas Instruments Incorporated Channel hopping based on channel performance statistics
CN113225170A (zh) * 2017-09-30 2021-08-06 中兴通讯股份有限公司 一种无线通信方法及装置
US11700093B2 (en) * 2017-10-10 2023-07-11 Lg Electronics Inc. Method for transmitting and receiving SRS and communication device therefor
DE102017220061A1 (de) * 2017-11-10 2019-05-16 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Datensender und Datenempfänger mit geringer Latenz für das Telegram-Splitting-Übertragungsverfahren
CN109842432B (zh) 2017-11-17 2021-02-12 华为技术有限公司 跳频处理方法及设备
CN113660188B (zh) * 2017-11-17 2024-12-20 华为技术有限公司 发送探测参考信号srs的方法和装置
CN108112081B (zh) * 2017-12-08 2024-03-26 中兴通讯股份有限公司 通信方法及系统
CN112567675B (zh) * 2018-08-10 2024-10-25 苹果公司 探测参考信号(srs)传输框架
US11424965B2 (en) * 2019-06-28 2022-08-23 Qualcomm Incorporated Sounding reference signal compatibility
US11121739B2 (en) * 2019-10-03 2021-09-14 Qualcomm Incorporated Sounding reference signal (SRS) configurations for one or more frequency hops
WO2021155586A1 (en) 2020-02-07 2021-08-12 Qualcomm Incorporated Sounding reference signal (srs) enhancements
US12081495B2 (en) * 2021-08-05 2024-09-03 Apple Inc. SRS signaling in 5G new radio wireless communications
WO2023060555A1 (en) * 2021-10-15 2023-04-20 Nokia Shanghai Bell Co., Ltd. Adaptive resource selection
CN114363244B (zh) * 2021-12-13 2023-11-03 国网信通亿力科技有限责任公司 一种计及网络风险和通信延时的电力通信传输网路由方法
US20240048174A1 (en) * 2022-08-04 2024-02-08 Qualcomm Incorporated Frequency hopping for sounding reference signal transmission

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AR014805A1 (es) * 1998-04-03 2001-03-28 Ericsson Telefon Ab L M Metodo para operar una unidad movil a fin de utilizarla en un sistema celular con desplazamiento por salto entre frecuencias no coordinadas, unidad movil y sistema celular con desplazamiento por salto entre frecuencias no coordinadas
KR100532328B1 (ko) * 1998-08-29 2006-03-23 삼성전자주식회사 부호분할다중접속통신시스템의피.엔시퀀스식별장치
KR100689382B1 (ko) * 2003-06-20 2007-03-02 삼성전자주식회사 직교분할다중화방식을 기반으로 하는이동통신시스템에서의 송신장치 및 방법
US8223817B2 (en) * 2005-12-29 2012-07-17 Telefonaktiebolaget Lm Ericsson (Publ) Method and arrangement for frequency hopping in wireless communication systems with carriers of varying bandwidth
EP1863215B1 (en) 2006-05-29 2019-01-30 Samsung Electronics Co., Ltd. Method and apparatus for allocating frequency resources in a wireless communication system supporting frequency division multiplexing
US8417248B2 (en) * 2006-08-14 2013-04-09 Texas Instruments Incorporated Methods and apparatus to schedule uplink transmissions in wireless communication systems
US8086272B2 (en) * 2007-08-06 2011-12-27 Mitsubishi Electric Research Laboratories, Inc. Wireless networks incorporating antenna selection based on received sounding reference signals
PL2294771T3 (pl) 2008-03-20 2013-11-29 Nokia Solutions & Networks Oy Wzór i rozkład przeskoków częstotliwości dla referencyjnego sygnału sondującego

Also Published As

Publication number Publication date
KR101250896B1 (ko) 2013-04-04
ES2428914T3 (es) 2013-11-12
ZA201005378B (en) 2011-03-30
DK2294771T3 (da) 2013-10-07
JP5297520B2 (ja) 2013-09-25
RU2010142363A (ru) 2012-04-27
EP2294771B1 (en) 2013-06-26
BRPI0907858A2 (pt) 2015-07-21
EP2294771A1 (en) 2011-03-16
RU2485708C9 (ru) 2013-11-20
CA2713202A1 (en) 2009-09-24
KR20100139042A (ko) 2010-12-31
USRE46975E1 (en) 2018-07-31
CN101978664B (zh) 2014-03-05
AU2009227004B2 (en) 2013-06-13
MX2010010224A (es) 2010-11-09
JP2011523516A (ja) 2011-08-11
US20090238241A1 (en) 2009-09-24
US8537876B2 (en) 2013-09-17
CN101978664A (zh) 2011-02-16
RU2485708C2 (ru) 2013-03-20
WO2009115563A1 (en) 2009-09-24
AU2009227004A1 (en) 2009-09-24
CA2713202C (en) 2014-02-11

Similar Documents

Publication Publication Date Title
ZA201005378B (en) Frequency hopping pattern and arrangement for sounding reference signal
PL2241049T3 (pl) Układ sondującego sygnału odniesienia
IL176652A0 (en) Phase-coherent signal generator
GB0808783D0 (en) Multiple simultaneous frequency detection
GB0822367D0 (en) High frequency measurement system
EP2297980A4 (en) Antenna selection with frequency-hopped sounding reference signals
BRPI1006052A2 (pt) receptor de localização de tempo e frequência de diversidade
EP1980089A4 (en) Non-intrusive signal quality evaluation
GB0706330D0 (en) Pattern detection circuitry
GB201005163D0 (en) Cognitive frequency hopping radio
PL2286485T3 (pl) Przekaźnik częstotliwości radiowej
IL195946A0 (en) Frequency hopping in an sc-fdma environment
PL2140549T3 (pl) Stabilizacja sygnału oscylatora
ZA200810337B (en) Interleaver apparatus and receiver for a signal generated by the interleaver apparatus
GB201110144D0 (en) Signal propagation across gaps
GB2478227B (en) Methods for determining the frequency or period of a signal
EP2003781A4 (en) FREQUENCY SYNTHESIZER
TWI341090B (en) Frequency synthesizer applied to frequency hopping system
GB0913144D0 (en) Carrier for transmitting high frequency signal and carrier layout method thereof
GB0817618D0 (en) Decoding frequency channelised signals
EP1932248A4 (en) HIGH FREQUENCY SIGNAL DISTRIBUTION
EP2018527A4 (en) ARRANGEMENT FOR DETECTING RESONANCE FREQUENCY CHANGES
GB2451475B (en) Frequency synthesizer
GB0721492D0 (en) Radio frequency apparatus
GB201021185D0 (en) Radio frequency absorption