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It reviews regulatory background from WARC-92 (RR 731E) and RR730 allocation conditions, then quantifies interference mechanisms in both directions: from MES to Fixed Service (uplink) and from Fixed Service to MSS satellites (receiver protection). It further evaluates downlink MSS-to-Fixed Service interference and summarizes mitigations affecting separation distances, satellite elevation angles, and exceedance time percentages.",{"@graph":69,"@context":123},[70,84,106],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":40,"@type":76,"position":81},"https://docshare.wps.com/document/research-report/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/erc-report-29-compatibility-study-between-mobile-satellite-service-and-fixed-service/267921/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/erc-report-29-compatibility-study-between-mobile-satellite-service-and-fixed-service/267921.png","ImageObject",300,407,{"name":92,"@type":93},"Mia  ","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-17","2026-09-14",true,{"@type":102,"interactionType":103,"userInteractionCount":105},"InteractionCounter",{"@type":104},"ViewAction",16,{"@type":107,"mainEntity":108},"FAQPage",[109,115,119],{"name":110,"@type":111,"acceptedAnswer":112},"What regulatory basis does the report cite for MSS and fixed service sharing?","Question",{"text":113,"@type":114},"The report references WARC-92 (RR 731E) band allocations to MSS and the primary fixed-service allocation under RR730 for multiple CEPT countries. It also notes that MSS stations under RR731E must not claim protection from stations operating under RR730.","Answer",{"name":116,"@type":111,"acceptedAnswer":117},"How does the report estimate interference from MES to the Fixed Service?",{"text":118,"@type":114},"It provides required separation distances for main, side, and back lobes, using short calculations shown in Annex 1. It also discusses that low simultaneous relay counts in the band could make interference likelihood low during early MSS development.",{"name":120,"@type":111,"acceptedAnswer":121},"What are the key findings for interference from Fixed Service to MSS satellites?",{"text":122,"@type":114},"For the GSO (TDMA) case, at least one satellite with low elevation angle to Germany may receive excessive interference in some spot beams. For the Non-GSO/ICO case, interference to the MSS uplink carrier can exceed protection criteria for 33% of the time, with reductions possible through threshold and statistical considerations, and via processing gain for CDMA systems.","https://schema.org",{"og:url":83,"og:type":125,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":127,"canonical":83},"index,follow",{"doc_id":129,"site_id":62},267921,1789426549,{"code":4,"msg":5,"data":132},{"doc_id":129,"user_id":133,"nickname":92,"user_avatar":134,"doc_module":4,"category_id":39,"category_name":40,"doc_title":65,"doc_description":67,"doc_content":135,"file_id":136,"file_url":137,"file_type":138,"file_size":139,"view_count":105,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":140,"language":141,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":142,"faqs":143,"seo_title":144,"seo_description":67,"update_tm":130,"read_time":145,"preview_page_count":4},687207024478,"https://ap-avatar.wpscdn.com/davatar_a8503ba1806abce46bf441b54a3ca4cd","ERC REPORT 29  \nEuropean Radiocommunications Committee (ERC)  \nwithin the European Conference of Postal and Telecommunications Administrations (CEPT)  \nCOMPATIBILITY STUDY BETWEEN MOBILE SATELLITE SERVICE IN THE 1610-1626.5 MHz BAND AND FIXED SERVICE OPERATING UNDER RR730  \nBrussels, June 1994  \nCONTENTS  \n1. Introduction p.1  \n2. Interference from MES to Fixed Service p.1  \n3. Interference from Fixed Service to MSS satellites p.1  \n4. Interference from downlink MSS to Fixed Service p.2  \n5. Conclusion p.2  \nAnnex 1 : Interference from MES to German radio relays  \nAnnex 2 : Interference to ICO/MSS systems from German FS systems  \nAnnex 3 : Interference to GEO/MSS systems from German FS systems  \nAnnex 4 : Compatibility between MSS downlink and the FS in Germany  \nCopyright 1994 the European Conference of Postal and Telecommunications Administrations (CEPT)  \nERC REPORT 29  \nPage 1  \nCOMPATIBILITY STUDY BETWEEN  \nMOBILE SATELLITE SERVICE IN THE 1610-1626.5 MHz BAND AND  \nFIXED SERVICE OPERATING UNDER RR730  \n1. INTRODUCTION  \nWARC-92 (RR 731E) allocated the band 1610-1626.5 MHz on a primary basis to the Mobile Satellite Service (MSS) in the earth-to-space direction (uplink) and the band 1613.8-1626.5 MHz on a secondary basis to the MSS in the space to earth direction (downlink) . This report presents the results of the study concerning the sharing between Fixed Service and MSS.  \nRR730 gives primary allocation to Fixed Service in the following CEPT countries : Germany, Austria, Bulgaria, Spain, France, Hungary, Poland, Romania, Czech Republic and Slovakia. RR731E states that MSS stations shall not cause interference or claim protection from stations operating under RR730 . Spain and France have been added to this footnote during WARC92 . France has not planned any introduction of systems for the moment. All other countries are expected to withdraw equipment before MSS operations in 1996.  \nCharacteristics for MSS are not fully determined at the moment. Both TDMA and CDMA access techniques and both GSO and non GSO satellites are considered in the calculations, with technical data already available. MSS systems are referred to by name for ease of identification.  \nAccording to RR731E, the MES maximum EIRP should be -15dBW/4kHz when sharing with systems operating under RR732 and-3dBW/4 kHz elsewhere.  \nFor the time being, only the Iridium project intends to use a secondary status downlink allocation in the band 1616 MHz to 1626.5 MHz.  \n2. INTERFERENCE FROM MES TO FIXED SERVICE  \nAccording to Germany and their experience from sharing between Inmarsat C and the fixed service, interference has sometimes occurred above 1626.5 MHz but the tactical RR systems, owing to their freedom in frequency selection, are able to deal with this interference.  \nTo give the order of magnitude of the interference, a very short calculation has been made in annex 1 and gives the following required separation distances :  \nMain lobe : 33 km (CDMA) to 66 km (TDMA)  \nSide lobe : 22 km (CDMA) to 46 km (TDMA)  \nBack lobe : 12 km (CDMA) to 30 km (TDMA)  \nHowever, considering the low number of radio relays operating simultaneously in the 1610-1626.5 MHz band, the likelihood of interference could be low when the MSS starts to develop.  \n3. INTERFERENCE FROM FIXED SERVICE TO MSS SATELLITES  \nCalculations carried out in this section have been made before knowing that German Radio Relays will be withdrawn before 1996. Thus, interference scenario considered was between a MSS satellite and a particular MES located close to Germany. It is likely that similar results would be obtained with other European countries operating Fixed Service according to RR730 .  \nERC REPORT 29  \nPage 2  \nInterference effects from the Fixed Service into MSS satellite receivers have been studied for example for GSO and NonGSO/ICO systems. Since the information on the number of simultaneous co-channel transmitting FS stations could not be gathered, a single FS station was assumed to be tra","cbCain2woJq3Wz6c","https://ap.wps.com/l/cbCain2woJq3Wz6c","pdf",64994,18,"English","# Introduction\n# Interference from MES to Fixed Service\n# Interference from Fixed Service to MSS satellites\n# Interference from downlink MSS to Fixed Service\n# Conclusion\n# Annex 1\n# Annex 2\n# Annex 3\n# Annex 4","[{\"question\":\"What regulatory basis does the report cite for MSS and fixed service sharing?\",\"answer\":\"The report references WARC-92 (RR 731E) band allocations to MSS and the primary fixed-service allocation under RR730 for multiple CEPT countries. It also notes that MSS stations under RR731E must not claim protection from stations operating under RR730.\"},{\"question\":\"How does the report estimate interference from MES to the Fixed Service?\",\"answer\":\"It provides required separation distances for main, side, and back lobes, using short calculations shown in Annex 1. It also discusses that low simultaneous relay counts in the band could make interference likelihood low during early MSS development.\"},{\"question\":\"What are the key findings for interference from Fixed Service to MSS satellites?\",\"answer\":\"For the GSO (TDMA) case, at least one satellite with low elevation angle to Germany may receive excessive interference in some spot beams. For the Non-GSO/ICO case, interference to the MSS uplink carrier can exceed protection criteria for 33% of the time, with reductions possible through threshold and statistical considerations, and via processing gain for CDMA systems.\"}]","ERC REPORT 29 - Compatibility Study Between Mobile Satellite Service and Fixed Service | PDF",45]